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US6895375B2
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System for bandwidth extension of Narrow-band speech
Assignee: AT&T Properties LLC
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Filing: 2001-10-04
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Granted: 2005-05-17
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Expires: 2021-10-04
Abstract
Abstract A system and method are disclosed for extending the bandwidth of a narrowband signal such as a speech signal. The method applies a parametric approach to bandwidth extension but does not require training. The parametric representation relates to a discrete acoustic tube model (DATM). The method comprises computing narrowband linear predictive coefficients (LPCs) from a received narrowband speech signal, computing narrowband partial correlation coefficients (parcors) using recursion, computing M nb area coefficients from the partial correlation coefficient, and extracting M wb area coefficients using interpolation. Wideband parcors are computed from the M wb area coefficients and wideband LPCs are computed from the wideband parcors. The method further comprises synthesizing a wideband signal using the wideband LPCs and a wideband excitation signal, highpass filtering the synthesized wideband signal to produce a highband signal, and combining the highband signal with the original narrowband signal to generate a wideband signal. In a preferred variation of the invention, the M nb area coefficients are converted to log-area coefficients for the purpose of extracting, through shifted-interpolation, M wb log-area coefficients. The M wb log-area coefficients are then converted to M wb area coefficients before generating the wideband parcors.
Inventors
- 👤 David Malah
- 👤 Richard Vandervoort Cox
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:18
CPC Classifications
G; G10; G10L; G10L21/00; G10L21/02; G10L21/038
Claims Analysis
Total Claims: 121
Claim 1
Independent Claim
70 words
A system for generating a wideband signal from a narrowband signal, the system comprising: a linear predictive coefficient module that computes narrowband coefficients; an area coefficient module that computes area coefficients using the narrowband coefficients; an area shifted-interpolation module the performs a shifted-interpolation of the area coefficients; and a module that transforms the shift-interpolated area coefficients into wideband linear predictive coefficients used for generating a wideband signal y wb .
Claim 2
Independent Claim
70 words
A system for generating a wideband signal from a narrowband signal, the system comprising: a linear predictive coefficient module that computes narrowband coefficients; an area coefficient module that computes area coefficients using the narrowband coefficients; an area shifted-interpolation module the performs a shifted-interpolation of the area coefficients; and a module that transforms the shift-interpolated area coefficients into wideband linear predictive coefficients used for generating a wideband signal y wb .
Claim 3
Dependent Claim
29 words
The system for generating a wideband signal of claim 1 , further comprising a synthesis module for generating the wideband signal y wb using the wideband linear predictive coefficients.
Claim 4
Dependent Claim
32 words
The system for generating a wideband signal of claim 1 , wherein the linear predictive coefficient module computes narrowband parcors and the area coefficient module computes area coefficients using the narrowband parcors.
Claim 5
Dependent Claim
89 words
The system for generating a wideband signal of claim 1 , wherein the area coefficient module computes M nb area coefficient using the following equation: A i = 1 + r i 1 - r i A i + 1 ; i = M nb , M nb - 1 , … , 1 , where A 1 corresponds to a cross-section at the lips, A M nb +1 correspond to cross-sections of the vocal tract at the glottis opening and r i are reflection coefficients.
Claim 6
Dependent Claim
25 words
The system for generating a wideband signal of claim 1 , wherein the area shifted-interpolation module interpolates using a linear first order polynomial interpolation scheme.
Claim 7
Dependent Claim
23 words
The system for generating a wideband signal of claim 1 , wherein the area shifted-interpolation module interpolates using a cubic spline interpolation scheme.
Claim 8
Dependent Claim
22 words
The system for generating a wideband signal of claim 1 , wherein the area shifted-interpolation module interpolates using a fractal interpolation scheme.
Claim 9
Dependent Claim
28 words
The system for generating a wideband signal of claim 1 , wherein the area shifted-interpolation module interpolates by a factor of 2, with a ¼ sampling interval shift.
Claim 10
Dependent Claim
36 words
The system for generating a wideband signal of claim 1 , wherein the area shifted-interpolation module interpolates by a factor of 4 followed by a single sampling interval shift and decimating by a factor of 2.
Claim 11
Independent Claim
117 words
A system for generating a wideband signal from a narrowband signal, the system comprising: a linear predictive coefficient module that computes narrowband coefficients; an area coefficient module that computes area coefficients using the narrowband coefficients; an area shifted-interpolation module the performs a shifted-interpolation of the area coefficients; a module that transforms the shift-interpolated area coefficients into wideband linear predictive coefficients; a synthesis module for generating a wideband signal y wb using the wideband linear predictive coefficients; a filter for high-pass filtering the wideband signal y wb to generate a highband signal; and a summer that combines the highband signal with the narrowband signal interpolated to a wideband sample rate to produce a wideband signal ŝ wb .
Claim 12
Independent Claim
117 words
A system for generating a wideband signal from a narrowband signal, the system comprising: a linear predictive coefficient module that computes narrowband coefficients; an area coefficient module that computes area coefficients using the narrowband coefficients; an area shifted-interpolation module the performs a shifted-interpolation of the area coefficients; a module that transforms the shift-interpolated area coefficients into wideband linear predictive coefficients; a synthesis module for generating a wideband signal y wb using the wideband linear predictive coefficients; a filter for high-pass filtering the wideband signal y wb to generate a highband signal; and a summer that combines the highband signal with the narrowband signal interpolated to a wideband sample rate to produce a wideband signal ŝ wb .
Claim 13
Independent Claim
265 words
A system for generating a wideband signal from a narrowband signal, the system comprising: (1) a narrowband processing module that produces a wideband excitation signal; (2) a wideband module that produces wideband linear predictive coefficients (LPCs) a i wb , the wideband module performing a method comprising: (a) computing partial correlation coefficients r i (parcors) from the narrowband signal; (b) computing M nb area coefficients according to the following equation: A i = 1 + r i 1 - r i A i + 1 ; i = M nb , M nb - 1 , … , 1 , where A 1 corresponds to the cross-section at lips and A M nb +1 corresponds to the cross-section at a glottis opening; (c) extracting M wb area coefficients from the M nb area coefficients using shifted-interpolation; (d) computing wideband parcors r i wb from the M wb area coefficients according to the following: r i wb = A i wb - A i + 1 wb A i wb + A i + 1 wb , i = 1 , 2 , … , M wb ; and (e) computing wideband linear predictive coefficients (LPCs) a i wb from the wideband parcors r i wb ; and (3) a synthesizing module that synthesizes a wideband signal y wb from the wideband LPCs a i wb and the wideband excitation signal; and (4) a summer that combines the synthesized wideband signal y wb and the narrowband signal interpolated to the wideband sample rate to generate a wideband signal ŝ wb .
Claim 14
Independent Claim
265 words
A system for generating a wideband signal from a narrowband signal, the system comprising: (1) a narrowband processing module that produces a wideband excitation signal; (2) a wideband module that produces wideband linear predictive coefficients (LPCs) a i wb , the wideband module performing a method comprising: (a) computing partial correlation coefficients r i (parcors) from the narrowband signal; (b) computing M nb area coefficients according to the following equation: A i = 1 + r i 1 - r i A i + 1 ; i = M nb , M nb - 1 , … , 1 , where A 1 corresponds to the cross-section at lips and A M nb +1 corresponds to the cross-section at a glottis opening; (c) extracting M wb area coefficients from the M nb area coefficients using shifted-interpolation; (d) computing wideband parcors r i wb from the M wb area coefficients according to the following: r i wb = A i wb - A i + 1 wb A i wb + A i + 1 wb , i = 1 , 2 , … , M wb ; and (e) computing wideband linear predictive coefficients (LPCs) a i wb from the wideband parcors r i wb ; and (3) a synthesizing module that synthesizes a wideband signal y wb from the wideband LPCs a i wb and the wideband excitation signal; and (4) a summer that combines the synthesized wideband signal y wb and the narrowband signal interpolated to the wideband sample rate to generate a wideband signal ŝ wb .
Claim 15
Independent Claim
74 words
A system for generating a wideband signal from a narrowband signal, the narrowband signal having narrowband coefficients computed from a linear prediction analysis, the system comprising: an area coefficient module that computes area coefficients associated with the narrowband coefficients; an area shifted-interpolation module the performs a shifted interpolation of the area coefficients; and a transformation module that transforms the shifted-interpolated area coefficients into wideband coefficients used to synthesize a wideband signal y wb .
Claim 16
Independent Claim
74 words
A system for generating a wideband signal from a narrowband signal, the narrowband signal having narrowband coefficients computed from a linear prediction analysis, the system comprising: an area coefficient module that computes area coefficients associated with the narrowband coefficients; an area shifted-interpolation module the performs a shifted interpolation of the area coefficients; and a transformation module that transforms the shifted-interpolated area coefficients into wideband coefficients used to synthesize a wideband signal y wb .
Claim 17
Dependent Claim
31 words
The system for generating a wideband signal from a narrowband signal of claim 12 , further comprising a synthesis module for synthesizing the wideband signal y wb using the wideband coefficients.
Claim 18
Dependent Claim
60 words
The system for generating a wideband signal from a narrowband signal of claim 13 , the system further comprising: a filter for high-pass filtering the wideband signal y wb to generate a highband signal; and a summer that combines the highband signal with the narrowband signal interpolated to a wideband sample rate to generate a wideband signal ŝ wb .
Claim 19
Independent Claim
73 words
A system for generating a wideband signal from a narrowband signal, the narrowband signal having narrowband coefficients computed from a linear prediction analysis, the system comprising: a log-area coefficient module that computes log-area coefficients associated with the narrowband coefficients; an area shifted-interpolation module the performs a shifted-interpolation of the log-area coefficients; and a transformation module that transforms the shifted-interpolated log-area coefficients into wideband coefficients used to synthesize a wideband signal y wb .
Claim 20
Independent Claim
73 words
A system for generating a wideband signal from a narrowband signal, the narrowband signal having narrowband coefficients computed from a linear prediction analysis, the system comprising: a log-area coefficient module that computes log-area coefficients associated with the narrowband coefficients; an area shifted-interpolation module the performs a shifted-interpolation of the log-area coefficients; and a transformation module that transforms the shifted-interpolated log-area coefficients into wideband coefficients used to synthesize a wideband signal y wb .
Claim 21
Dependent Claim
33 words
The system for generating a wideband signal from a narrowband signal of claim 15 , the system further comprising a synthesis module for synthesizing the wideband signal y wb using the wideband coefficients.
Claim 22
Dependent Claim
62 words
The system for generating a wideband signal from a narrowband signal of claim 16 , the system further comprising: a filter for high-pass filtering the wideband signal y wb to generate a highband signal; and a summer that combines the highband signal y wb with the narrowband signal interpolated to a wideband sample rate to generate a wideband signal ŝ wb .
Claim 23
Dependent Claim
98 words
The system for generating a wideband signal from a narrowband signal of claim 15 , wherein the log-area coefficient module computes M nb log-area coefficients using the equation below and computing their logarithmic values: A i = 1 + r i 1 - r i A i + 1 ; i = M nb , M nb - 1 , … , 1 , where A 1 corresponds to a cross-section at the lips, A M nb +1 correspond to cross-sections of the vocal tract at the glottis opening and r i are reflection coefficients.
Claim 24
Dependent Claim
32 words
The system for generating a wideband signal from a narrowband signal of claim 15 , wherein the log-area coefficient module interpolates the log-area coefficients using a linear first order polynomial interpolation scheme.
Claim 25
Dependent Claim
30 words
The system for generating a wideband signal from a narrowband signal of claim 15 , wherein the log-area coefficient module interpolates the log-area coefficients using a cubic spline interpolation scheme.
Claim 26
Dependent Claim
29 words
The system for generating a wideband signal from a narrowband signal of claim 15 , wherein the log-area coefficient module interpolates the log-area coefficients using a fractal interpolation scheme.
Claim 27
Dependent Claim
34 words
The system for generating a wideband signal from a narrowband signal of claim 15 , wherein the log-area coefficient module interpolates the log-area coefficients by a factor of 2, with a ¼ sample shift.
Claim 28
Dependent Claim
42 words
The system for generating a wideband signal from a narrowband signal of claim 15 , wherein the log-area coefficient module interpolates the log-area coefficients by a factor of 4 followed by a single sample shift and decimating by a factor of 2.
Claim 29
Independent Claim
152 words
A system for generating a wideband signal from a narrowband signal, the system comprising: (1) a module for processing the narrowband signal comprising: (a) a signal interpolation module producing an interpolated narrowband signal; (b) an inverse filter that filters the interpolated narrowband signal; and (c) a nonlinear operation module that generates an excitation signal from the filtered interpolated narrowband signal; (2) a module for producing wideband coefficients comprising: (a) a linear predictive analysis module that produces M nb narrowband coefficients associated with the narrowband signal; (b) an area parameter module that computes area parameters using the M nb narrowband coefficients; (c) a shifted-interpolation module that computes shift-interpolated area parameters from the area parameters; and (d) a module that computes M wb wideband coefficients from the shift-interpolated area parameters; and (3) a synthesis module that receives the M wb wideband coefficients and the excitation signal to synthesize a wideband signal y wb .
Claim 30
Independent Claim
152 words
A system for generating a wideband signal from a narrowband signal, the system comprising: (1) a module for processing the narrowband signal comprising: (a) a signal interpolation module producing an interpolated narrowband signal; (b) an inverse filter that filters the interpolated narrowband signal; and (c) a nonlinear operation module that generates an excitation signal from the filtered interpolated narrowband signal; (2) a module for producing wideband coefficients comprising: (a) a linear predictive analysis module that produces M nb narrowband coefficients associated with the narrowband signal; (b) an area parameter module that computes area parameters using the M nb narrowband coefficients; (c) a shifted-interpolation module that computes shift-interpolated area parameters from the area parameters; and (d) a module that computes M wb wideband coefficients from the shift-interpolated area parameters; and (3) a synthesis module that receives the M wb wideband coefficients and the excitation signal to synthesize a wideband signal y wb .
Claim 31
Dependent Claim
64 words
The system for generating a wideband signal from a narrowband signal of claim 24 , the system further comprising: (4) a filter and gain module for filtering the wideband signal y wb to generate a highband signal; and (5) a summer for combining the highband signal and the narrowband signal interpolated to a wideband sample rate to generate a wideband signal ŝ wb .
Claim 32
Dependent Claim
48 words
The system for generating a wideband signal from a narrowband signal of claim 25 , wherein the module for producing wideband coefficients further produces narrowband parcors from the M nb narrowband coefficients, and computes the M wb wideband coefficients from wideband parcors generated from the wideband area coefficients.
Claim 33
Dependent Claim
98 words
The system for generating a wideband signal from a narrowband signal of claim 25 , wherein the M nb narrowband area coefficients A i nb , i=1, 2, . . . , M nb are generated using the following: A i = 1 + r i 1 - r i A i + 1 ; i = M nb , M nb - 1 , … , 1 , where A 1 corresponds to a cross-section at lips, A M nb +1 and corresponds to a cross-section of a vocal tract at a glottis opening.
Claim 34
Dependent Claim
67 words
The system for generating a wideband signal from a narrowband signal of claim 27 , wherein the wideband parcors using the M wb area coefficients are generated according to the following: r i wb = A i wb - A i + 1 wb A i wb + A i + 1 wb , i = 1 , 2 , … , M wb .
Claim 35
Independent Claim
93 words
A system for generating a wideband signal from a narrowband signal, the system comprising: (1) a narrowband signal module that produces an interpolated narrowband signal at a wideband sampling rate; and (2) a wideband signal module that generates a wideband signal y wb according to a method comprising: (a) computing area parameters from narrowband linear predictive coefficients (LPCs) associated with the narrowband signal; (b) interpolating the area parameters; (c) converting the interpolated area parameters into wideband linear predictive coefficients; and (d) synthesizing the wideband signal y wb using the wideband linear predictive coefficients.
Claim 36
Independent Claim
93 words
A system for generating a wideband signal from a narrowband signal, the system comprising: (1) a narrowband signal module that produces an interpolated narrowband signal at a wideband sampling rate; and (2) a wideband signal module that generates a wideband signal y wb according to a method comprising: (a) computing area parameters from narrowband linear predictive coefficients (LPCs) associated with the narrowband signal; (b) interpolating the area parameters; (c) converting the interpolated area parameters into wideband linear predictive coefficients; and (d) synthesizing the wideband signal y wb using the wideband linear predictive coefficients.
Claim 37
Dependent Claim
63 words
The system for generating a wideband signal from a narrowband signal of claim 29 , wherein the method used by the wideband signal module to generate the wideband signal further comprises: (e) highpass filtering the wideband signal y wb to form a highband signal; and (f) combining the highband signal and the interpolated narrowband signal to generate a wideband signal ŝ wb .
Claim 38
Dependent Claim
93 words
The system for generating a wideband signal from a narrowband signal of claim 29 , wherein the wideband signal module further produces wideband linear predictive coefficients by: computing narrowband parcors using recursion; computing M nb area coefficients using the narrowband parcors, wherein the area parameters are the M nb area coefficients; extracting M wb area coefficients from the M nb area coefficients using shifted-interpolation, wherein the interpolated are parameters are the M wb area coefficients; computing wideband parcors using the M wb area coefficients; and computing the wideband LPCs from the wideband parcors.
Claim 39
Independent Claim
268 words
A system for generating a wideband signal from a narrowband signal, the system comprising: (1) a narrowband signal module that produces an interpolated narrowband signal at a wideband sampling rate and produces a wideband excitation signal from the narrowband signal; and (2) a wideband signal module that generates a wideband signal y wb according to a method comprising: (a) computing partial correlation coefficients r i (parcors) from the narrowband signal; (b) computing M nb area coefficients according to the following equation: A i = 1 + r i 1 - r i A i + 1 ; i = M nb , M nb - 1 , … , 1 , where A 1 corresponds to the cross-section at lips and A M nb +1 corresponds to the cross-section at a glottis opening; (c) computing M nb log-area coefficients by applying a natural-log operator to the M nb area coefficients; (d) extracting M wb log-area coefficients from the M nb log-area coefficients using shifted-interpolation; (e) converting the M wb log-area coefficients into M wb area coefficients; (f) computing wideband parcors r i wb from the M wb area coefficients according to the following: r i wb = A i wb - A i + 1 wb A i wb + A i + 1 wb , i = 1 , 2 , … , M wb ; (g) computing wideband linear predictive coefficients (LPCs) a i wb from the wideband parcors r i wb ; and (h) synthesizing the wideband signal y wb from the wideband LPCs a i wb and the wideband excitation signal.
Claim 40
Independent Claim
268 words
A system for generating a wideband signal from a narrowband signal, the system comprising: (1) a narrowband signal module that produces an interpolated narrowband signal at a wideband sampling rate and produces a wideband excitation signal from the narrowband signal; and (2) a wideband signal module that generates a wideband signal y wb according to a method comprising: (a) computing partial correlation coefficients r i (parcors) from the narrowband signal; (b) computing M nb area coefficients according to the following equation: A i = 1 + r i 1 - r i A i + 1 ; i = M nb , M nb - 1 , … , 1 , where A 1 corresponds to the cross-section at lips and A M nb +1 corresponds to the cross-section at a glottis opening; (c) computing M nb log-area coefficients by applying a natural-log operator to the M nb area coefficients; (d) extracting M wb log-area coefficients from the M nb log-area coefficients using shifted-interpolation; (e) converting the M wb log-area coefficients into M wb area coefficients; (f) computing wideband parcors r i wb from the M wb area coefficients according to the following: r i wb = A i wb - A i + 1 wb A i wb + A i + 1 wb , i = 1 , 2 , … , M wb ; (g) computing wideband linear predictive coefficients (LPCs) a i wb from the wideband parcors r i wb ; and (h) synthesizing the wideband signal y wb from the wideband LPCs a i wb and the wideband excitation signal.
Claim 41
Independent Claim
304 words
A system for generating a wideband signal from a narrowband signal, the system comprising: (1) a narrowband signal module that produces an interpolated narrowband signal at a wideband sampling rate and produces a wideband excitation signal from the narrowband signal; and (2) a wideband signal module that generates a wideband signal y wb according to a method comprising: (a) computing partial correlation coefficients r i (parcors) from the narrowband signal; (b) computing M nb area coefficients according to the following equation: A i = 1 + r i 1 - r i A i + 1 ; i = M nb , M nb - 1 , … , 1 , where A 1 corresponds to the cross-section at lips and A M nb + corresponds to the cross-section at a glottis opening; (c) computing M nb log-area coefficients by applying a natural-log operator to the M nb area coefficients; (d) extracting M wb log-area coefficients from the M nb log-area coefficients using shifted-interpolation; (e) converting the M wb log-area coefficients into M wb area coefficients; (f) computing wideband parcors r i wb from the M wb area coefficients according to the following: r i wb = A i wb - A i + 1 wb A i wb + A i + 1 wb , i = 1 , 2 , … , M wb ; (g) computing wideband linear predictive coefficients (LPCs) a i wb from the wideband parcors r i wb ; and (h) synthesizing a wideband signal y wb from the wideband LPCs a i wb and the wideband excitation signal; (i) highpass filtering the wideband signal y wb to form a highband signal S hb ; and (j) generating a wideband signal ŝ wb by summing the highband signal S hb and the interpolated narrowband signal.
Claim 42
Independent Claim
304 words
A system for generating a wideband signal from a narrowband signal, the system comprising: (1) a narrowband signal module that produces an interpolated narrowband signal at a wideband sampling rate and produces a wideband excitation signal from the narrowband signal; and (2) a wideband signal module that generates a wideband signal y wb according to a method comprising: (a) computing partial correlation coefficients r i (parcors) from the narrowband signal; (b) computing M nb area coefficients according to the following equation: A i = 1 + r i 1 - r i A i + 1 ; i = M nb , M nb - 1 , … , 1 , where A 1 corresponds to the cross-section at lips and A M nb + corresponds to the cross-section at a glottis opening; (c) computing M nb log-area coefficients by applying a natural-log operator to the M nb area coefficients; (d) extracting M wb log-area coefficients from the M nb log-area coefficients using shifted-interpolation; (e) converting the M wb log-area coefficients into M wb area coefficients; (f) computing wideband parcors r i wb from the M wb area coefficients according to the following: r i wb = A i wb - A i + 1 wb A i wb + A i + 1 wb , i = 1 , 2 , … , M wb ; (g) computing wideband linear predictive coefficients (LPCs) a i wb from the wideband parcors r i wb ; and (h) synthesizing a wideband signal y wb from the wideband LPCs a i wb and the wideband excitation signal; (i) highpass filtering the wideband signal y wb to form a highband signal S hb ; and (j) generating a wideband signal ŝ wb by summing the highband signal S hb and the interpolated narrowband signal.
Claim 43
Dependent Claim
107 words
The system for generating a wideband signal from a narrowband signal of claim 33 , wherein the narrowband signal module produces the wideband excitation signal from the narrowband signal according to the following method: (a) performing linear prediction on the narrowband signal to find a i wb LP coefficients; (b) interpolating the narrowband signal to produce an upsampled narrowband signal; (c) producing a narrowband residual signal {tilde over (r)} nb by inverse filtering the upsampled interpolated narrowband signal using a transfer function associated with the a i wb LP coefficients; and (d) generating the wideband excitation signal from the narrowband residual signal {tilde over (r)} nb .
Claim 44
Independent Claim
56 words
A system for producing a wideband signal from a narrowband signal, the system comprising: a module that computes M nb area coefficients from the narrowband signal; a module that interpolates the M nb area coefficients into M wb area coefficients; and a module that generates a wideband signal y wb using the M wb area coefficients.
Claim 45
Independent Claim
56 words
A system for producing a wideband signal from a narrowband signal, the system comprising: a module that computes M nb area coefficients from the narrowband signal; a module that interpolates the M nb area coefficients into M wb area coefficients; and a module that generates a wideband signal y wb using the M wb area coefficients.
Claim 46
Dependent Claim
45 words
The system for producing a wideband signal from a narrowband signal of claim 35 , the system further comprising: a module that generates a wideband signal ŝ wb by combining the wideband signal y wb with the narrowband signal interpolated to the highband sampling rate.
Claim 47
Dependent Claim
104 words
A computer-readable storage medium storing instructions for controlling a computer device to produce a wideband signal from a narrowband signal according to the following method: (1) computing partial correlation coefficients (parcors) from the narrowband signal; (2) computing M nb area coefficients using the parcors; (3) extracting M wb area coefficients from the M nb area coefficients using shifted-interpolation; (4) computing highband parcors from the M wb area coefficients; (5) converting the M wb area coefficients into highband LPCs using the highband parcors; and (6) synthesizing a wideband signal y wb using the highband LPCs and a wideband excitation signal generated from the narrowband signal.
Claim 48
Dependent Claim
104 words
A computer-readable storage medium storing instructions for controlling a computer device to produce a wideband signal from a narrowband signal according to the following method: (1) computing partial correlation coefficients (parcors) from the narrowband signal; (2) computing M nb area coefficients using the parcors; (3) extracting M wb area coefficients from the M nb area coefficients using shifted-interpolation; (4) computing highband parcors from the M wb area coefficients; (5) converting the M wb area coefficients into highband LPCs using the highband parcors; and (6) synthesizing a wideband signal y wb using the highband LPCs and a wideband excitation signal generated from the narrowband signal.
Claim 49
Dependent Claim
64 words
The computer-readable storage medium storing instructions for controlling a computer device to produce a wideband signal from a narrowband signal of claim 37 , the method further comprising: (7) filtering the wideband signal y wb to generate a highband signal; and (8) summing the highband signal and the narrowband signal interpolated to the wideband sample rate to generate a wideband signal ŝ wb .
Claim 50
Dependent Claim
26 words
The computer-readable storage medium of claim 37 , wherein the number of M wb area coefficients is two times the number of M nb area coefficients.
Claim 51
Dependent Claim
123 words
A computer-readable storage medium storing a method for controlling a computer device to produce a wideband signal from a narrowband signal, the method comprising: (1) computing partial correlation coefficients (parcors) from the narrowband signal; (2) computing M nb area coefficients using the parcors; (3) computing M nb log-area coefficients using the M nb area coefficients; (4) extracting M wb log-area coefficients from the M nb log-area coefficients using shifted-interpolation; (5) applying exponentiation to compute M wb area coefficients; (6) computing wideband parcors from the M wb area coefficients; (7) converting the M wb area coefficients into wideband LPCs using the wideband parcors; and (8) synthesizing a wideband signal y wb using the wideband LPCs and an excitation signal generated from the narrowband signal.
Claim 52
Dependent Claim
123 words
A computer-readable storage medium storing a method for controlling a computer device to produce a wideband signal from a narrowband signal, the method comprising: (1) computing partial correlation coefficients (parcors) from the narrowband signal; (2) computing M nb area coefficients using the parcors; (3) computing M nb log-area coefficients using the M nb area coefficients; (4) extracting M wb log-area coefficients from the M nb log-area coefficients using shifted-interpolation; (5) applying exponentiation to compute M wb area coefficients; (6) computing wideband parcors from the M wb area coefficients; (7) converting the M wb area coefficients into wideband LPCs using the wideband parcors; and (8) synthesizing a wideband signal y wb using the wideband LPCs and an excitation signal generated from the narrowband signal.
Claim 53
Dependent Claim
64 words
The computer-readable storage medium storing a method for controlling a computer device to produce a wideband signal from a narrowband signal of claim 40 , the method further comprising: (9) filtering the wideband signal y wb to generate a highband signal; (10) combining the highband signal and the narrowband signal interpolated to the wideband sample rate to generate a wideband signal ŝ wb .
Claim 54
Dependent Claim
77 words
A computer-readable storage medium storing a method for controlling a computer device to produce a wideband signal from a narrowband signal, the method receiving narrowband data associated with a narrowband signal, the method comprising: computing M nb area coefficients using the narrowband data; extracting M wb area coefficients from the M nb area coefficients using shifted-interpolation; and synthesizing a wideband signal y wb using wideband coefficients generated from the M wb area coefficients and an excitation signal.
Claim 55
Dependent Claim
77 words
A computer-readable storage medium storing a method for controlling a computer device to produce a wideband signal from a narrowband signal, the method receiving narrowband data associated with a narrowband signal, the method comprising: computing M nb area coefficients using the narrowband data; extracting M wb area coefficients from the M nb area coefficients using shifted-interpolation; and synthesizing a wideband signal y wb using wideband coefficients generated from the M wb area coefficients and an excitation signal.
Claim 56
Dependent Claim
62 words
The computer-readable storage medium storing a method for controlling a computer device to produce a wideband signal from a narrowband signal of claim 42 , the method further comprising: filtering the wideband signal y wb to generate a highband signal; and generating a wideband signal ŝ wb by combining the highband signal and the narrowband signal interpolated to the wideband sample rate.
Claim 57
Dependent Claim
48 words
The computer-readable storage medium of claim 42 , wherein the data associated with the M wb area coefficients used to synthesize the wideband signal y wb further comprises wideband parcors computed from the interpolated M wb area coefficients and wideband linear predictive coefficients computed from the wideband parcors.
Claim 58
Dependent Claim
32 words
The computer-readable storage medium of claim 42 , wherein the excitation signal used to synthesize the wideband signal y wb further comprises a wideband excitation signal generated from a narrowband residual signal.
Claim 59
Dependent Claim
35 words
The computer-readable storage medium of claim 42 , wherein extracting M wb area coefficients from the M nb area coefficients using shifted-interpolation further comprises interpolating by a factor of 2 with a ¼ sample shift.
Claim 60
Dependent Claim
43 words
The computer-readable storage medium of claim 42 , wherein extracting M wb area coefficients from the M nb area coefficients using shifted-interpolation further comprises interpolating by a factor of 4 followed by a single sample shift and decimating by a factor of 2.
Claim 61
Dependent Claim
91 words
A computer-readable storage medium storing a method for controlling a computer device to produce a wideband signal from a narrowband signal, the method comprising: (1) generating a wideband excitation signal from the narrowband signal; (2) computing M nb area coefficients from the narrowband signal; (3) extracting M wb area coefficients from the M nb area coefficients using interpolation; (4) computing wideband linear predictive coefficients (LPCs) using the M wb area coefficients; and (5) synthesizing a wideband signal y wb from the wideband LPCs a i wb and the wideband excitation signal.
Claim 62
Dependent Claim
91 words
A computer-readable storage medium storing a method for controlling a computer device to produce a wideband signal from a narrowband signal, the method comprising: (1) generating a wideband excitation signal from the narrowband signal; (2) computing M nb area coefficients from the narrowband signal; (3) extracting M wb area coefficients from the M nb area coefficients using interpolation; (4) computing wideband linear predictive coefficients (LPCs) using the M wb area coefficients; and (5) synthesizing a wideband signal y wb from the wideband LPCs a i wb and the wideband excitation signal.
Claim 63
Dependent Claim
106 words
The computer-readable storage medium storing a method for controlling a computer device to produce a wideband signal from a narrowband signal of claim 48 , wherein generating a wideband excitation signal further comprises: (a) performing linear prediction on the narrowband signal to find a i wb LP coefficients; (b) interpolating the narrowband signal to produce an upsampled narrowband signal; (c) producing a narrowband residual signal {tilde over (r)} nb by inverse filtering the upsampled interpolated narrowband signal using a transfer function associated with the a i wb LP coefficients; and (d) generating the wideband excitation signal from the narrowband residual signal {tilde over (r)} nb .
Claim 64
Dependent Claim
65 words
The computer-readable storage medium storing a method for controlling a computer device to produce a wideband signal from a narrowband signal of claim 48 , the method further comprising: (6) highpass filtering the wideband signal y wb to produce a highband signal; and (7) generating a wideband signal ŝ wb by summing the highband signal and the narrowband signal interpolated to the wideband sample rate.
Claim 65
Dependent Claim
52 words
The computer-readable storage medium storing a method for controlling a computer device to produce a wideband signal from a narrowband signal of claim 48 , wherein extracting M wb area coefficients from the M nb area coefficients using shifted-interpolation further comprises interpolating by a factor of 2 with a ¼ sample shift.
Claim 66
Dependent Claim
60 words
The computer-readable storage medium storing a method for controlling a computer device to produce a wideband signal from a narrowband signal of claim 48 , wherein extracting M wb area coefficients from the M nb area coefficients using shifted-interpolation further comprises interpolating by a factor of 4 followed by a single sample shift and decimating by a factor of 2.
Claim 67
Dependent Claim
47 words
The computer-readable storage medium storing a method for controlling a computer device to produce a wideband signal from a narrowband signal of claim 48 , wherein extracting M wb area coefficients from the M nb area coefficients using shifted-interpolation further comprises using a first order linear shifted-interpolation.
Claim 68
Dependent Claim
44 words
The computer-readable storage medium storing a method for controlling a computer device to produce a wideband signal from a narrowband signal of claim 48 , wherein extracting M wb area coefficients from the M nb area coefficients using shifted-interpolation further comprises using cubic-spline interpolation.
Claim 69
Dependent Claim
44 words
The computer-readable storage medium storing a method for controlling a computer device to produce a wideband signal from a narrowband signal of claim 48 , wherein extracting M wb area coefficients from the M nb area coefficients using shifted-interpolation further comprises using fractal interpolation.
Claim 70
Dependent Claim
251 words
A computer-readable storage medium storing instructions for controlling a computer device to produce a wideband signal from a narrowband signal, the instructions controlling the computer device to perform the steps of: (1) producing a wideband excitation signal from the narrowband signal; (2) computing partial correlation coefficients r i (parcors) from the narrowband signal; (3) computing M nb area coefficients according to the following equation: A i = 1 + r i 1 - r i A i + 1 ; i = M nb , M nb - 1 , … , 1 , where A 1 corresponds to the cross-section at lips and A M nb +1 corresponds to the cross-section at a glottis opening; (4) computing M nb log-area coefficients by applying a natural-log operator to the M nb area coefficients; (5) extracting M wb log-area coefficients from the M nb log-area coefficients using shifted-interpolation; (6) converting the M wb log-area coefficients into M wb area coefficients; (7) computing wideband parcors r i wb from the M wb area coefficients according to the following: r i wb = A i wb - A i + 1 wb A i wb + A i + 1 wb , i = 1 , 2 , … , M wb ; (8) computing wideband linear predictive coefficients (LPCs) a i wb from the wideband parcors r i wb ; and (9) synthesizing a wideband signal y wb from the wideband LPCs a i wb and the wideband excitation signal.
Claim 71
Dependent Claim
251 words
A computer-readable storage medium storing instructions for controlling a computer device to produce a wideband signal from a narrowband signal, the instructions controlling the computer device to perform the steps of: (1) producing a wideband excitation signal from the narrowband signal; (2) computing partial correlation coefficients r i (parcors) from the narrowband signal; (3) computing M nb area coefficients according to the following equation: A i = 1 + r i 1 - r i A i + 1 ; i = M nb , M nb - 1 , … , 1 , where A 1 corresponds to the cross-section at lips and A M nb +1 corresponds to the cross-section at a glottis opening; (4) computing M nb log-area coefficients by applying a natural-log operator to the M nb area coefficients; (5) extracting M wb log-area coefficients from the M nb log-area coefficients using shifted-interpolation; (6) converting the M wb log-area coefficients into M wb area coefficients; (7) computing wideband parcors r i wb from the M wb area coefficients according to the following: r i wb = A i wb - A i + 1 wb A i wb + A i + 1 wb , i = 1 , 2 , … , M wb ; (8) computing wideband linear predictive coefficients (LPCs) a i wb from the wideband parcors r i wb ; and (9) synthesizing a wideband signal y wb from the wideband LPCs a i wb and the wideband excitation signal.
Claim 72
Dependent Claim
77 words
The computer-readable storage medium storing instructions for controlling a computer device to produce a wideband signal from a narrowband signal of claim 56 , the instructions controlling the computer device to further perform the steps of: (10) highpass filtering the wideband signal y wb to form a highband signal S hb ; and (11) generating a wideband signal ŝ wb by summing the highband signal S hb and the narrowband signal interpolated to the wideband sample rate.
Claim 73
Dependent Claim
48 words
The computer-readable storage medium storing instructions for controlling a computer device to produce a wideband signal from a narrowband signal of claim 57 , wherein extracting M wb log-area coefficients from the M nb log-area coefficients using shifted-interpolation further comprises using a linear first order polynomial interpolation scheme.
Claim 74
Dependent Claim
46 words
The computer-readable storage medium storing instructions for controlling a computer device to produce a wideband signal from a narrowband signal of claim 57 , wherein extracting M wb log-area coefficients from the M nb log-area coefficients using shifted-interpolation further comprises using a cubic spline interpolation scheme.
Claim 75
Dependent Claim
45 words
The computer-readable storage medium storing instructions for controlling a computer device to produce a wideband signal from a narrowband signal of claim 57 , wherein extracting M wb log-area coefficients from the M nb log-area coefficients using shifted-interpolation further comprises using a fractal interpolation scheme.
Claim 76
Dependent Claim
219 words
A computer-readable storage medium storing a method for controlling a computer device to produce a wideband signal from a narrowband signal, the method comprising: (1) computing partial correlation coefficients r i (parcors) from the narrowband signal; (2) computing M nb area coefficients according to the following equation: A i = 1 + r i 1 - r i A i + 1 ; i = M nb , M nb - 1 , … , 1 , where A 1 corresponds to the cross-section at lips and A M nb +1 corresponds to the cross-section at a glottis opening; (3) computing M nb log-area coefficients; (4) extracting M wb log-area coefficients from the M nb log-area coefficients using shifted-interpolation; (5) computing M wb area coefficients from the M nb log-area coefficients; (6) computing wideband parcors r i wb from the M wb area coefficients according to the following: r i wb = A i wb - A i + 1 wb A i wb + A i + 1 wb , i = 1 , 2 , … , M wb ; (7) computing wideband linear predictive coefficients (LPCs) a i wb from the wideband parcors r i wb ; and (8) synthesizing a wideband signal y wb from the wideband LPCs and an excitation signal.
Claim 77
Dependent Claim
219 words
A computer-readable storage medium storing a method for controlling a computer device to produce a wideband signal from a narrowband signal, the method comprising: (1) computing partial correlation coefficients r i (parcors) from the narrowband signal; (2) computing M nb area coefficients according to the following equation: A i = 1 + r i 1 - r i A i + 1 ; i = M nb , M nb - 1 , … , 1 , where A 1 corresponds to the cross-section at lips and A M nb +1 corresponds to the cross-section at a glottis opening; (3) computing M nb log-area coefficients; (4) extracting M wb log-area coefficients from the M nb log-area coefficients using shifted-interpolation; (5) computing M wb area coefficients from the M nb log-area coefficients; (6) computing wideband parcors r i wb from the M wb area coefficients according to the following: r i wb = A i wb - A i + 1 wb A i wb + A i + 1 wb , i = 1 , 2 , … , M wb ; (7) computing wideband linear predictive coefficients (LPCs) a i wb from the wideband parcors r i wb ; and (8) synthesizing a wideband signal y wb from the wideband LPCs and an excitation signal.
Claim 78
Dependent Claim
53 words
The computer-readable storage medium storing a method for controlling a computer device to produce a wideband signal from a narrowband signal of claim 61 , the method further comprising: (9) generating a wideband signal ŝ wb by combining the wideband signal y wb and the narrowband signal interpolated to the wideband sample rate.
Claim 79
Dependent Claim
49 words
The computer-readable storage medium storing instructions for controlling a computer device to produce a wideband signal from a narrowband signal of claim 62 , wherein extracting M wb , log-area coefficients from the M nb log-area coefficients using shifted-interpolation further comprises using a linear first order polynomial interpolation scheme.
Claim 80
Dependent Claim
46 words
The computer-readable storage medium storing instructions for controlling a computer device to produce a wideband signal from a narrowband signal of claim 62 , wherein extracting M wb log-area coefficients from the M nb log-area coefficients using shifted-interpolation further comprises using a cubic spline interpolation scheme.
Claim 81
Dependent Claim
45 words
The computer-readable storage medium storing instructions for controlling a computer device to produce a wideband signal from a narrowband signal of claim 62 , wherein extracting M wb log-area coefficients from the M nb log-area coefficients using shifted-interpolation further comprises using a fractal interpolation scheme.
Claim 82
Dependent Claim
81 words
A computer-readable storage medium storing a method for controlling a computer device to produce a wideband signal from a narrowband signal, the method comprising: (1) computing M nb area coefficients from the narrowband signal; (2) extracting M nb area coefficients from the M nb area coefficients using interpolation; (3) computing wideband linear predictive coefficients (LPCs) using the M wb area coefficients; and (4) synthesizing a wideband signal y wb from the wideband LPCs a i wb and highpass filtered white noise.
Claim 83
Dependent Claim
81 words
A computer-readable storage medium storing a method for controlling a computer device to produce a wideband signal from a narrowband signal, the method comprising: (1) computing M nb area coefficients from the narrowband signal; (2) extracting M nb area coefficients from the M nb area coefficients using interpolation; (3) computing wideband linear predictive coefficients (LPCs) using the M wb area coefficients; and (4) synthesizing a wideband signal y wb from the wideband LPCs a i wb and highpass filtered white noise.
Claim 84
Dependent Claim
68 words
A wideband signal generated according to a method of extending the bandwidth of a narrowband signal, the method comprising: (1) computing M nb area coefficients from the narrowband signal; (2) extracting M wb area coefficients from the M nb area coefficients using interpolation; and (3) synthesizing a wideband signal y wb using wideband coefficients processed from data associated with the M nb area coefficients and an excitation signal.
Claim 85
Dependent Claim
68 words
A wideband signal generated according to a method of extending the bandwidth of a narrowband signal, the method comprising: (1) computing M nb area coefficients from the narrowband signal; (2) extracting M wb area coefficients from the M nb area coefficients using interpolation; and (3) synthesizing a wideband signal y wb using wideband coefficients processed from data associated with the M nb area coefficients and an excitation signal.
Claim 86
Dependent Claim
106 words
The wideband signal generated according to a method of extending the bandwidth of a narrowband signal of claim 67 , the method further comprising generating the excitation signal from the narrowband signal by: (a) performing linear prediction on the narrowband signal to find a i wb LP coefficients; (b) interpolating the narrowband signal to produce an upsampled narrowband signal; (c) producing a narrowband residual signal {tilde over (r)} nb by inverse filtering the upsampled interpolated narrowband signal using a transfer function associated with the a i wb LP coefficients; and (d) generating the wideband excitation signal from the narrowband residual signal {tilde over (r)} nb .
Claim 87
Dependent Claim
47 words
The wideband signal generated according to a method of extending the bandwidth of a narrowband signal of claim 67 , wherein extracting M wb area coefficients from the M nb area coefficients using shifted-interpolation further comprises interpolating by a factor of 2 with a ¼ sample shift.
Claim 88
Dependent Claim
55 words
The wideband signal generated according to a method of extending the bandwidth of a narrowband signal of claim 67 , wherein extracting M wb area coefficients from the M nb area coefficients using shifted-interpolation further comprises interpolating by a factor of 4 followed by a single sample shift and decimation by a factor of 2.
Claim 89
Dependent Claim
42 words
The wideband signal generated according to a method of extending the bandwidth of a narrowband signal of claim 67 , wherein extracting M wb area coefficients from the M nb area coefficients using shifted-interpolation further comprises using a first order linear shifted-interpolation.
Claim 90
Dependent Claim
39 words
The wideband signal generated according to a method of extending the bandwidth of a narrowband signal of claim 67 , wherein extracting M wb area coefficients from the M nb area coefficients using shifted-interpolation further comprises using cubic-spline interpolation.
Claim 91
Dependent Claim
39 words
The wideband signal generated according to a method of extending the bandwidth of a narrowband signal of claim 67 , wherein extracting M wb area coefficients from the M nb area coefficients using shifted-interpolation further comprises using fractal interpolation.
Claim 92
Dependent Claim
108 words
A wideband signal generated according to a method of extending the bandwidth of a narrowband signal, the method comprising: (1) computing M nb area coefficients from the narrowband signal; (2) extracting M wb area coefficients from the M nb area coefficients using interpolation; (3) synthesizing a wideband signal y wb using wideband coefficients processed from data associated with the M nb area coefficients and an excitation signal generated from the narrowband signal; (4) highpass filtering the wideband signal y wb to generate a highband signal; and (5) generating a wideband signal ŝ wb by combining the highband signal and the narrowband signal interpolated to the wideband sample rate.
Claim 93
Dependent Claim
108 words
A wideband signal generated according to a method of extending the bandwidth of a narrowband signal, the method comprising: (1) computing M nb area coefficients from the narrowband signal; (2) extracting M wb area coefficients from the M nb area coefficients using interpolation; (3) synthesizing a wideband signal y wb using wideband coefficients processed from data associated with the M nb area coefficients and an excitation signal generated from the narrowband signal; (4) highpass filtering the wideband signal y wb to generate a highband signal; and (5) generating a wideband signal ŝ wb by combining the highband signal and the narrowband signal interpolated to the wideband sample rate.
Claim 94
Dependent Claim
91 words
A wideband signal generated according to a method of extending the bandwidth of a narrowband signal, the narrowband signal having associated parcors, the method comprising: (1) computing M nb area coefficients from the narrowband parcors; (2) obtaining M wb area coefficients using interpolation; (3) synthesizing a wideband signal y wb from the M wb area coefficients; (4) filtering the wideband signal y wb to generate a highband signal; and (5) generating a wideband signal ŝ wb by combining the highband signal and the narrowband signal interpolated to the wideband sample rate.
Claim 95
Dependent Claim
91 words
A wideband signal generated according to a method of extending the bandwidth of a narrowband signal, the narrowband signal having associated parcors, the method comprising: (1) computing M nb area coefficients from the narrowband parcors; (2) obtaining M wb area coefficients using interpolation; (3) synthesizing a wideband signal y wb from the M wb area coefficients; (4) filtering the wideband signal y wb to generate a highband signal; and (5) generating a wideband signal ŝ wb by combining the highband signal and the narrowband signal interpolated to the wideband sample rate.
Claim 96
Dependent Claim
31 words
The wideband signal generated according to a method of extending the bandwidth of a narrowband signal of claim 75 , wherein the area coefficients computed relate the discrete acoustic tube model.
Claim 97
Dependent Claim
76 words
A wideband signal generated from a narrowband signal according to a method comprising: (1) computing M nb area coefficients from the narrowband signal; (2) computing M nb log-area coefficients from the M nb area coefficients; (3) interpolating the M nb log-area coefficients into M wb log-area coefficients; (4) converting the M wb log-area coefficients into M wb area coefficients; and (5) synthesizing a wideband signal y wb using the M wb area coefficients and white noise.
Claim 98
Dependent Claim
76 words
A wideband signal generated from a narrowband signal according to a method comprising: (1) computing M nb area coefficients from the narrowband signal; (2) computing M nb log-area coefficients from the M nb area coefficients; (3) interpolating the M nb log-area coefficients into M wb log-area coefficients; (4) converting the M wb log-area coefficients into M wb area coefficients; and (5) synthesizing a wideband signal y wb using the M wb area coefficients and white noise.
Claim 99
Dependent Claim
114 words
A wideband signal generated from a narrowband signal according to a method comprising: (1) computing M nb area coefficients from the narrowband signal; (2) computing M nb log-area coefficients from the M nb area coefficients; (3) interpolating the M nb log-area coefficients into M wb log-area coefficients; (4) converting the M wb log-area coefficients into M wb area coefficients; (5) synthesizing a wideband signal y wb using the M wb area coefficients and an excitation signal; (6) generating a highband signal by highpass filtering the wideband signal y wb ; and (7) combining the highband signal with the narrowband signal interpolated to the wideband sample rate to generate a wideband signal ŝ wb .
Claim 100
Dependent Claim
114 words
A wideband signal generated from a narrowband signal according to a method comprising: (1) computing M nb area coefficients from the narrowband signal; (2) computing M nb log-area coefficients from the M nb area coefficients; (3) interpolating the M nb log-area coefficients into M wb log-area coefficients; (4) converting the M wb log-area coefficients into M wb area coefficients; (5) synthesizing a wideband signal y wb using the M wb area coefficients and an excitation signal; (6) generating a highband signal by highpass filtering the wideband signal y wb ; and (7) combining the highband signal with the narrowband signal interpolated to the wideband sample rate to generate a wideband signal ŝ wb .
Claim 101
Dependent Claim
84 words
The wideband signal of claim 78 , wherein computing M nb area coefficients further comprises computing M nb area coefficients using the following equation: A i = 1 + r i 1 - r i A i + 1 ; i = M nb , M nb - 1 , … , 1 , where A 1 corresponds to a cross-section at the lips, A M nb +1 corresponds to a cross-section at the glottis opening and r i are reflection coefficients.
Claim 102
Dependent Claim
30 words
The wideband signal of claim 78 , wherein interpolating the M nb log-area coefficients into M wb log-area coefficients further comprises interpolating, using a linear first order polynomial interpolation scheme.
Claim 103
Dependent Claim
23 words
The wideband signal of claim 78 , wherein interpolating the M nb log-area coefficients further comprises interpolating using a cubic spline interpolation scheme.
Claim 104
Dependent Claim
22 words
The wideband signal of claim 78 , wherein interpolating the M nb log-area coefficients further comprises interpolating using a fractal interpolation scheme.
Claim 105
Dependent Claim
27 words
The wideband signal of claim 78 , wherein interpolating the M nb log-area coefficients further comprises interpolating by a factor of 2, with a ¼ sample shift.
Claim 106
Dependent Claim
35 words
The wideband signal of claim 78 , wherein interpolating the M nb log-area coefficients further comprises interpolating by a factor of 4 followed by a single sample shift and decimating by a factor of 2.
Claim 107
Independent Claim
73 words
A system for generating a wideband signal from a narrowband signal, the system comprising: a module for computing M nb log-area coefficients by applying a log operator to M nb area coefficients generated from the narrowband signal; a module for extracting M wb log-area coefficients from the M nb log-area coefficients using interpolation; and a module for generating a wideband signal using M wb area coefficients generated from the M wb log-area coefficients.
Claim 108
Independent Claim
73 words
A system for generating a wideband signal from a narrowband signal, the system comprising: a module for computing M nb log-area coefficients by applying a log operator to M nb area coefficients generated from the narrowband signal; a module for extracting M wb log-area coefficients from the M nb log-area coefficients using interpolation; and a module for generating a wideband signal using M wb area coefficients generated from the M wb log-area coefficients.
Claim 109
Dependent Claim
46 words
The system for generating a wideband signal from a narrowband signal of claim 85 , wherein extracting the M nb log-area coefficients using interpolation further comprises interpolating by a factor of 4 followed by a single sampling interval shift and decimating by a factor of 2.
Claim 110
Dependent Claim
55 words
A computer-readable storage medium storing a method for controlling a computer device to produce a wideband signal from a narrowband signal, the method comprising: computing M nb area coefficients from the narrowband signal; interpolating the M nb area coefficients into M wb area coefficients; and generating the wideband signal using the M wb area coefficients.
Claim 111
Dependent Claim
55 words
A computer-readable storage medium storing a method for controlling a computer device to produce a wideband signal from a narrowband signal, the method comprising: computing M nb area coefficients from the narrowband signal; interpolating the M nb area coefficients into M wb area coefficients; and generating the wideband signal using the M wb area coefficients.
Claim 112
Dependent Claim
36 words
The computer-readable medium of claim 87 , wherein interpolating the M nb area coefficients further comprises interpolating by a factor of 4 followed by a single sampling interval shift and decimating by a factor of 2.
Claim 113
Dependent Claim
74 words
A computer-readable storage medium storing a method for controlling a computer device to produce a wideband signal from a narrowband signal, the method comprising: computing M nb log-area coefficients by applying a log operator to M nb area coefficients generated from the narrowband signal; extracting M wb log-area coefficients from the M nb log-area coefficients using interpolation; and generating a wideband signal using M wb area coefficients generated from the M wb log-area coefficients.
Claim 114
Dependent Claim
74 words
A computer-readable storage medium storing a method for controlling a computer device to produce a wideband signal from a narrowband signal, the method comprising: computing M nb log-area coefficients by applying a log operator to M nb area coefficients generated from the narrowband signal; extracting M wb log-area coefficients from the M nb log-area coefficients using interpolation; and generating a wideband signal using M wb area coefficients generated from the M wb log-area coefficients.
Claim 115
Dependent Claim
38 words
The computer-readable medium of claim 89 , wherein extracting the M nb log-area coefficients using interpolation further comprises interpolating by a factor of 4 followed by a single sampling interval shift and decimating by a factor of 2.
Claim 116
Dependent Claim
44 words
A wideband signal generated from a narrowband signal according to a method comprising: computing M nb area coefficients from the narrowband signal; interpolating the M nb area coefficients into M wb area coefficients; and generating the wideband signal using the M wb area coefficients.
Claim 117
Dependent Claim
44 words
A wideband signal generated from a narrowband signal according to a method comprising: computing M nb area coefficients from the narrowband signal; interpolating the M nb area coefficients into M wb area coefficients; and generating the wideband signal using the M wb area coefficients.
Claim 118
Dependent Claim
36 words
The wideband signal of claim 91 , wherein interpolating the M nb area coefficients further comprises interpolating by a factor of 4 followed by a single sampling interval shift and decimating by a factor of 2.
Claim 119
Dependent Claim
63 words
A wideband signal generated from a narrowband signal according to a method comprising: computing M nb log-area coefficients by applying a log operator to M nb area coefficients generated from the narrowband signal; extracting M wb log-area coefficients from the M nb log-area coefficients using interpolation; and generating a wideband signal using M wb area coefficients generated from the M wb log-area coefficients.
Claim 120
Dependent Claim
63 words
A wideband signal generated from a narrowband signal according to a method comprising: computing M nb log-area coefficients by applying a log operator to M nb area coefficients generated from the narrowband signal; extracting M wb log-area coefficients from the M nb log-area coefficients using interpolation; and generating a wideband signal using M wb area coefficients generated from the M wb log-area coefficients.
Claim 121
Dependent Claim
38 words
The wideband signal of claim 93 , wherein extracting the M nb log-area coefficients using interpolation further comprises interpolating by a factor of 4 followed by a single sampling interval shift and decimating by a factor of 2.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2008-05-16 | 2008-11-15 | 2009-05-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2012-05-16 | 2012-11-15 | 2013-05-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2016-05-16 | 2016-11-15 | 2017-05-17 | $7700.00 | Window Closed / Lapsed |