US5648989A
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Linear prediction filter coefficient quantizer and filter set
Assignee: SUMMIT Tech SYSTEMS LP
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Filing: 1994-12-21
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Granted: 1997-07-15
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Expires: 2014-12-21
Abstract
Abstract A simultaneous voice and data (SVD) modem includes a preemphasis filter for processing an audio source signal, e.g., a voice signal, before transmission to a far-end SVD-capable modem. The preemphasis filter implements a second order linear predictor in which a quantized set of predictor coefficients are selected directly from the normalized autocorrelation coefficients. In addition, an index is associated with the selected set of predictor coefficients. This index is transmitted to an opposite SVD-capable modem, which thereby allows the opposite SVD-capable modem to select the same set of predictor coefficients for use in recovering the voice signal at the opposite endpoint.
Inventors
- 👤 Kenneth David Ko
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:53
CPC Classifications
G; G10; G10L; G10L19/00; G10L19/04; G10L19/06; H; H04; H04L; H04L27/00
Claims Analysis
Total Claims: 33
Claim 1
Independent Claim
53 words
A method for use in a communications device comprising the steps of: generating discrete-time sampled values of a signal; generating a set of normalized autocorrelation coefficients from the sampled values; and selecting a set of quantized prediction coefficients as a function of normalized autocorrelation coefficients without determining a set of non-quantized prediction coefficients.
Claim 2
Independent Claim
53 words
A method for use in a communications device comprising the steps of: generating discrete-time sampled values of a signal; generating a set of normalized autocorrelation coefficients from the sampled values; and selecting a set of quantized prediction coefficients as a function of normalized autocorrelation coefficients without determining a set of non-quantized prediction coefficients.
Claim 3
Dependent Claim
40 words
The method of claim 1, further comprising the steps of: calculating a residual of the sampled values as a function of the selected set of quantized coefficients; and transmitting the residual of the sampled values to an opposite communications device.
Claim 4
Dependent Claim
27 words
The method of claim 2, wherein the step of transmitting the residual of the sampled values is transmitted as part of a simultaneous voice and data signal.
Claim 5
Dependent Claim
19 words
The method of claim 1 wherein the communications device is a modem and the signal is a voice signal.
Claim 6
Independent Claim
54 words
A method for use in a communications device comprising the steps of: providing a sample of a signal; generating a set of normalized autocorrelation coefficients from the sample; and selecting a set of quantized prediction coefficients as a function of the set of normalized autocorrelation coefficients without determining a set of non-quantized prediction coefficients.
Claim 7
Independent Claim
54 words
A method for use in a communications device comprising the steps of: providing a sample of a signal; generating a set of normalized autocorrelation coefficients from the sample; and selecting a set of quantized prediction coefficients as a function of the set of normalized autocorrelation coefficients without determining a set of non-quantized prediction coefficients.
Claim 8
Dependent Claim
29 words
The method of claim 5 further comprising the steps of: calculating an index from the selected set of quantized coefficients; and transmitting the index to an opposite communications device.
Claim 9
Dependent Claim
19 words
The method of claim 5 wherein the communications device is a modem and the signal is a voice signal.
Claim 10
Dependent Claim
80 words
Communications device apparatus comprising: means responsive to an input signal for selecting a set of quantized prediction coefficients; and means for filtering the input signal in accordance with the selected set of quantized prediction coefficients; wherein the means responsive to the input signal selects the set of quantized prediction coefficients as a function of a set of normalized autocorrelation coefficients without determining a set of non-quantized prediction coefficients, where the normalized autocorrelation coefficients are a function of the input signal.
Claim 11
Dependent Claim
80 words
Communications device apparatus comprising: means responsive to an input signal for selecting a set of quantized prediction coefficients; and means for filtering the input signal in accordance with the selected set of quantized prediction coefficients; wherein the means responsive to the input signal selects the set of quantized prediction coefficients as a function of a set of normalized autocorrelation coefficients without determining a set of non-quantized prediction coefficients, where the normalized autocorrelation coefficients are a function of the input signal.
Claim 12
Dependent Claim
35 words
The apparatus of claim 8 further comprising: means responsive to the filtered input signal and the input signal for providing a residual signal; and means for transmitting the residual signal to an opposite communications device.
Claim 13
Independent Claim
21 words
The apparatus of claim of 9 wherein the input signal is a voice signal and the communications device is a modem.
Claim 14
Dependent Claim
24 words
The apparatus of claim 9 wherein the means for transmitting transmits the residual signal as a part of a simultaneous voice and data signal.
Claim 15
Dependent Claim
89 words
Apparatus for use in a communications device, the apparatus comprising: means for providing a sample of a signal; and means for providing a residual of the sample of the signal; wherein the means for providing the residual of the sample determines the residual as a function of a set of quantized coefficients that are selected as a function of a set of normalized autocorrelation coefficients without determining a set of non-quantized prediction coefficients, and the set of normalized autocorrelation coefficients are a function of the sample of the signal.
Claim 16
Dependent Claim
89 words
Apparatus for use in a communications device, the apparatus comprising: means for providing a sample of a signal; and means for providing a residual of the sample of the signal; wherein the means for providing the residual of the sample determines the residual as a function of a set of quantized coefficients that are selected as a function of a set of normalized autocorrelation coefficients without determining a set of non-quantized prediction coefficients, and the set of normalized autocorrelation coefficients are a function of the sample of the signal.
Claim 17
Dependent Claim
20 words
The apparatus of claim 12 further comprising means for transmitting the residual of the sample to an opposite communications device.
Claim 18
Dependent Claim
25 words
The apparatus of claim 13 wherein in the transmitting means transmits the residual of the sample as part of a simultaneous voice and data signal.
Claim 19
Dependent Claim
19 words
The apparatus of claim 12 wherein the communications device is a modem and the signal is a voice signal.
Claim 20
Dependent Claim
80 words
Apparatus for use in a communications device, the apparatus comprising: means for providing a sample of a signal; and means for providing an index; wherein the means for providing the index determines the index as a function of a set of quantized coefficients that are selected as a function of a set of normalized autocorrelation coefficients without determining a set of non-quantized prediction coefficients, and the set of normalized autocorrelation coefficients are a function of the sample of the signal.
Claim 21
Dependent Claim
80 words
Apparatus for use in a communications device, the apparatus comprising: means for providing a sample of a signal; and means for providing an index; wherein the means for providing the index determines the index as a function of a set of quantized coefficients that are selected as a function of a set of normalized autocorrelation coefficients without determining a set of non-quantized prediction coefficients, and the set of normalized autocorrelation coefficients are a function of the sample of the signal.
Claim 22
Dependent Claim
17 words
The apparatus of claim 16 further comprising means for transmitting the index to an opposite communications device.
Claim 23
Dependent Claim
19 words
The apparatus of claim 16 wherein the communications device is a modem and the signal is a voice signal.
Claim 24
Dependent Claim
95 words
Communications device apparatus comprising: a filter for filtering an input signal; means responsive to the input signal for selecting a set of filter coefficients of the filter; and means for generating a residual signal as a function of the input signal and an output signal of the filter; wherein the means responsive to the input signal selects the set from a collection of filter coefficient sets, and the collection is divided into a number of filter coefficient groups, where each set of filter coefficients in the same group has at least one identical filter coefficient.
Claim 25
Dependent Claim
95 words
Communications device apparatus comprising: a filter for filtering an input signal; means responsive to the input signal for selecting a set of filter coefficients of the filter; and means for generating a residual signal as a function of the input signal and an output signal of the filter; wherein the means responsive to the input signal selects the set from a collection of filter coefficient sets, and the collection is divided into a number of filter coefficient groups, where each set of filter coefficients in the same group has at least one identical filter coefficient.
Claim 26
Dependent Claim
16 words
The apparatus of claim 19 wherein the number of filter coefficients in each set is two.
Claim 27
Dependent Claim
34 words
The apparatus of claim 19 wherein the means responsive to the input signal selects the set of filter coefficients by performing a selection function that does not determine a non-quantized set of filter coefficients.
Claim 28
Dependent Claim
51 words
The apparatus of claim 19 wherein the means responsive to the input signal selects the set of filter coefficients as a function of a set of normalized autocorrelation coefficients without determining a set of non-quantized filter coefficients, and the set of normalized autocorrelation coefficients are a function of the input signal.
Claim 29
Dependent Claim
69 words
Communication device apparatus comprising: means for storing a collection of sets of filter coefficients; and means responsive to an input signal for selecting a set of filter coefficients as a function of a set of normalized autocorrelation coefficients; wherein the collection of sets is divided into a number of filter coefficient groups, where each set of filter coefficients in the same group have at least one identical filter coefficient.
Claim 30
Dependent Claim
69 words
Communication device apparatus comprising: means for storing a collection of sets of filter coefficients; and means responsive to an input signal for selecting a set of filter coefficients as a function of a set of normalized autocorrelation coefficients; wherein the collection of sets is divided into a number of filter coefficient groups, where each set of filter coefficients in the same group have at least one identical filter coefficient.
Claim 31
Dependent Claim
44 words
The apparatus of claim 23 further comprising means for filtering the input signal, where the means for filtering uses the selected set of filter coefficients; and means for providing a residual signal as a function of the input signal and the filtered input signal.
Claim 32
Dependent Claim
16 words
The apparatus of claim 23 wherein the number of filter coefficients in each set is two.
Claim 33
Dependent Claim
27 words
The apparatus of claim 23 wherein the selection function performed by the means responsive to the input signal does not determine a non-quantized set of filter coefficients.
References Cited (Backward Citations)
US5226060A
Cited
US5282225A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2000-07-14 | 2001-01-13 | 2001-07-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-07-14 | 2005-01-13 | 2005-07-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-07-14 | 2009-01-13 | 2009-07-15 | $7700.00 | Window Closed / Lapsed |