US5081681A
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Method and apparatus for phase synthesis for speech processing
Assignee: Digital Voice Systems Inc
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Filing: 1989-11-30
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Granted: 1992-01-14
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Expires: 2009-11-30
Abstract
Abstract A class of methods and related technology for determining the phase of each harmonic from the fundamental frequency of voiced speech. Applications of this invention include, but are not limited to, speech coding, speech enhancement, and time scale modification of speech. Features of the invention include recreating phase signals from fundamental frequency and voiced/unvoiced information, and adding a random component to the recreated phase signal to improve the quality of the synthesized speech.
Inventors
- 👤 John C. Hardwick
- 👤 Jae S. Lim
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 12:20
CPC Classifications
G; G10; G10L; G10L21/00; G10L21/04; G10L19/00; G10L19/02; G10L21/02
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
78 words
A method for synthesizing speech, wherein the harmonic phase signal Θ k (t) in voiced speech is synthesized by the method comprising the steps of enabling receiving voice/unvoiced information V k (t) and fundamental angular frequency information ω(t), enabling processing V k (t) and ω(t), generating intermediate phase information φ k (t), and obtaining a random component r k (t), and enabling synthesizing Θ k (t) of voiced speech by combining φ k (t) and r k (t).
Claim 2
Independent Claim
78 words
A method for synthesizing speech, wherein the harmonic phase signal Θ k (t) in voiced speech is synthesized by the method comprising the steps of enabling receiving voice/unvoiced information V k (t) and fundamental angular frequency information ω(t), enabling processing V k (t) and ω(t), generating intermediate phase information φ k (t), and obtaining a random component r k (t), and enabling synthesizing Θ k (t) of voiced speech by combining φ k (t) and r k (t).
Claim 3
Dependent Claim
24 words
The method of claim 1 wherein ##EQU11## and wherein the initial φ k (t) can be set to zero or some other initial value.
Claim 4
Dependent Claim
7 words
The method of claim 1 wherein ##EQU12##
Claim 5
Dependent Claim
84 words
The method of claim 1 wherein r k (t) is expressed as follows: r.sub.k (t)=α(t)·u.sub.k (t) where u k (t) is a white random signal with u k (t) being uniformly distributed between [-π, π], and where α(t) is obtained from the following: ##EQU13## where N(t) is the total number of harmonics of interest as a function of time according to the relationship of ω(t) to the bandwidth of interest, and the number of voiced harmonics at time t is expressed as follows: ##EQU14##
Claim 6
Dependent Claim
29 words
The method of claim 1 wherein the random component r k (t) has a large magnitude on average when the percentage of unvoiced harmonics at time t is high.
Claim 7
Independent Claim
81 words
An apparatus for synthesizing speech, wherein the harmonic phase signal Θ k (t) in voiced speech is synthesized, said apparatus comprising means for receiving voiced/unvoiced information V k (t) and fundamental angular frequency information ω(t) means for processing V k (t) and ω(t) and generating intermediate phase information φ k (t), means for obtaining a random phase component r k (t), and means for synthesizing Θ k (t) of voiced speech by addition of r k (t) to φ k (t).
Claim 8
Independent Claim
81 words
An apparatus for synthesizing speech, wherein the harmonic phase signal Θ k (t) in voiced speech is synthesized, said apparatus comprising means for receiving voiced/unvoiced information V k (t) and fundamental angular frequency information ω(t) means for processing V k (t) and ω(t) and generating intermediate phase information φ k (t), means for obtaining a random phase component r k (t), and means for synthesizing Θ k (t) of voiced speech by addition of r k (t) to φ k (t).
Claim 9
Dependent Claim
33 words
The apparatus of claim 6 wherein φ k (t) is derived according to the following: ##EQU15## and wherein the initial φ k (t) can be set to zero or some other initial value.
Claim 10
Dependent Claim
15 words
The apparatus of claim 6 wherein ω(t) can be derived according to the following: ##EQU16##
Claim 11
Dependent Claim
84 words
The apparatus of claim 6 wherein r k (t) is expressed as follows: r.sub.k (t)=α(t)·u.sub.k (t) where u k (t) is a white random signal with u k (t) being uniformly distributed between [-π, π], and where α(t) is obtained from the following: ##EQU17## where N(t) is the total number of harmonics of interest as a function of time according to the relationship of ω(t) to the bandwidth of interest, and the number of voiced harmonics at time t is expressed as follows: ##EQU18##
Claim 12
Dependent Claim
29 words
The apparatus of claim 6 wherein the random component r k (t) has a large magnitude on average when the percentage of unvoiced harmonics at time t is high.
Claim 13
Independent Claim
113 words
An apparatus for synthesizing speech from digitized speech information, comprising an analyzer for generation of a sequence of voice/unvoiced information, V k (t), fundamental angular frequency information ω(t), and harmonic magnitude information signal A k (t), over a sequence of times t 0 . . . t n , a phase synthesizer for generating a sequence t 0 . . . t n based upon corresponding ones of voiced/unvoiced information V k (t) and fundamental angular frequency information ω(t), and a synthesizer for synthesizing voiced speech based upon the generated parameters V k (t), ω(t), A k (t), and Θ k (t) over the sequence t 0 . . . t n .
Claim 14
Independent Claim
113 words
An apparatus for synthesizing speech from digitized speech information, comprising an analyzer for generation of a sequence of voice/unvoiced information, V k (t), fundamental angular frequency information ω(t), and harmonic magnitude information signal A k (t), over a sequence of times t 0 . . . t n , a phase synthesizer for generating a sequence t 0 . . . t n based upon corresponding ones of voiced/unvoiced information V k (t) and fundamental angular frequency information ω(t), and a synthesizer for synthesizing voiced speech based upon the generated parameters V k (t), ω(t), A k (t), and Θ k (t) over the sequence t 0 . . . t n .
Claim 15
Dependent Claim
66 words
The apparatus of claim 11 wherein the phase synthesizer includes means for receiving voiced/unvoiced information V k (t) and fundamental angular frequency information ω(t), means for processing V k (t) and ω(t) and generating intermediate phase information φ k (t), and means for obtaining a random phase component r k (t) and synthesizing θ k (t) by addition of r k (t) to φ k (t).
Claim 16
Dependent Claim
33 words
The apparatus of claim 11 wherein φ k (t) is derived according to the following: ##EQU19## and wherein the initial φ k (t) can be set to zero or some other initial value.
Claim 17
Dependent Claim
15 words
The apparatus of claim 11 wherein ω(t) can be derived according to the following: ##EQU20##
Claim 18
Dependent Claim
84 words
The apparatus of claim 11 wherein r k (t) is expressed as follows: r.sub.k (t)=α(t)·u.sub.k (t) where u k (t) is a white random signal with u k (t) being uniformly distributed between [-π, π], and where α(t) is obtained from the following: ##EQU21## where N(t) is the total number of harmonics of interest as a function of time according to the relationship of ω(t) to the bandwidth of interest, and the number of voiced harmonics at time t is expressed as follows: ##EQU22##
Claim 19
Dependent Claim
29 words
The apparatus of claim 11 wherein the random component r k (t) has a large magnitude on average when the percentage of unvoiced harmonics at time t is high.
Claim 20
Independent Claim
127 words
A method for synthesizing speech from digitized speech information, comprising the steps of enabling analyzing digitized speech information and generating a sequence of voiced/unvoiced information signals V k (t), fundamental angular frequency information signals ω(t), and harmonic magnitude information signals A k (t), over a sequence of times t 0 . . . t n , enabling synthesizing a sequence of harmonic phase signals Θ k (t) over the time sequence t 0 . . . t n based upon corresponding ones of voiced/unvoiced information signals V k (t) and fundamental angular frequency information signals ω(t), and enabling synthesizing voiced speech based upon the parameters V k (t), ω(t), A k (t), and Θ k (t) over the sequence t 0 . . . t n .
Claim 21
Independent Claim
127 words
A method for synthesizing speech from digitized speech information, comprising the steps of enabling analyzing digitized speech information and generating a sequence of voiced/unvoiced information signals V k (t), fundamental angular frequency information signals ω(t), and harmonic magnitude information signals A k (t), over a sequence of times t 0 . . . t n , enabling synthesizing a sequence of harmonic phase signals Θ k (t) over the time sequence t 0 . . . t n based upon corresponding ones of voiced/unvoiced information signals V k (t) and fundamental angular frequency information signals ω(t), and enabling synthesizing voiced speech based upon the parameters V k (t), ω(t), A k (t), and Θ k (t) over the sequence t 0 . . . t n .
Claim 22
Dependent Claim
67 words
The method of claim 17 wherein synthesizing a harmonic phase signal Θ k (t) comprises the steps of enabling receiving voiced/unvoiced information V k (t) and fundamental angular frequency information ω(t), enabling processing V k (t) and ω(t) and generating intermediate phase information φ k (t), obtaining a random component r k (t), and synthesizing Θ k (t) by combining φ k (t) and r k (t).
Claim 23
Dependent Claim
24 words
The method of claim 17 wherein ##EQU23## and wherein the initial φ k (t) can be set to zero or some other initial value.
Claim 24
Dependent Claim
7 words
The method of claim 17 wherein ##EQU24##
Claim 25
Dependent Claim
29 words
The method of claim 17 wherein the random component r k (t) has a large magnitude on average when the percentage of unvoiced harmonics at time t is high.
Claim 26
Dependent Claim
84 words
The method of claim 17 wherein r k (t) is expressed as follows: r.sub.k (t)=α(t)·u.sub.k (t) where u k (t) is a White random signal with u k (t) being uniformly distributed between [-π, π], and where α(t) is obtained from the following: ##EQU25## where N(t) is the total number of harmonics of interest as a function of time according to the relationship of ω(t) to the bandwidth of interest, and the number of voiced harmonics at time t is expressed as follows: ##EQU26##
References Cited (Backward Citations)
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