US5710863A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Speech signal quantization using human auditory models in predictive coding systems
Assignee: Nokia of America Corp
•
Filing: 1995-09-19
•
Granted: 1998-01-20
•
Expires: 2015-09-19
Abstract
Abstract A speech compression system called "Transform Predictive Coding", or TPC, provides for encoding 7 kHz wideband speech (160 kHz sampling) at a target bit-rate range of 16 to 32 kb/s (1 to 2 bits/sample). The system uses short-term and long-term prediction to remove the redundancy in speech. A prediction residual is transformed and coded in the frequency domain to take advantage of knowledge in human auditory perception. The TPC coder uses only open-loop quantization and therefore has a fairly low complexity. The speech quality of TPC is essentially transparent at 32 kb/s, very good at 24 kb/s, and acceptable at 16 kb/s.
Inventors
- 👤 Juin-Hwey Chen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:36
CPC Classifications
G; G10; G10L; G10L19/00; G10L19/02; G10L19/0212; G10L19/002; G10L19/04; G10L19/06; G10L2019/0001; G10L2019/0003; G10L2019/0011; G10L2019/0013; G10L25/00; G10L25/03; G10L25/24; G10L25/27
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
90 words
A method of coding a signal representing speech information, the method comprising: generating a first signal representing an estimate of the signal representing speech information; comparing the signal representing speech information with the first signal to form a second signal representing a difference between said compared signals; determining a quantizer resolution in accordance with a perceptual noise masking signal which is determined by a model of human audio perception; quantizing the second signal in accordance with the determined quantizer resolution; and generating a coded signal based on said quantized signal.
Claim 2
Independent Claim
90 words
A method of coding a signal representing speech information, the method comprising: generating a first signal representing an estimate of the signal representing speech information; comparing the signal representing speech information with the first signal to form a second signal representing a difference between said compared signals; determining a quantizer resolution in accordance with a perceptual noise masking signal which is determined by a model of human audio perception; quantizing the second signal in accordance with the determined quantizer resolution; and generating a coded signal based on said quantized signal.
Claim 3
Dependent Claim
17 words
The method of claim 1 wherein the signal representing speech information comprises a linear prediction residual signal.
Claim 4
Dependent Claim
17 words
The method of claim 1 wherein the signal representing speech information comprises a pitch prediction residual signal.
Claim 5
Dependent Claim
25 words
The method of claim 1 wherein the signal representing speech information comprises a linear prediction residual signal which has been transformed into a frequency domain.
Claim 6
Dependent Claim
29 words
The method of claim 1 wherein the step of determining the quantizer resolution comprises determining a noise masking threshold based on a frequency response of a quantized synthesis filter.
Claim 7
Independent Claim
118 words
A system for coding a signal representing speech information, the system comprising: a first signal generator adapted to generate a first signal representing an estimate of the signal representing speech information; a signal comparator adapted to compare the signal representing speech information with the first signal to form a second signal representing a difference between said compared signals; a quantization resolution determination module adapted to determine a quantizer resolution in accordance with a perceptual noise masking signal which is determined by a model of human audio perception; a quantizer adapted to quantize the second signal in accordance with the determined quantizer resolution; and a second signal generator adapted to generate a coded signal based on said quantized signal.
Claim 8
Independent Claim
118 words
A system for coding a signal representing speech information, the system comprising: a first signal generator adapted to generate a first signal representing an estimate of the signal representing speech information; a signal comparator adapted to compare the signal representing speech information with the first signal to form a second signal representing a difference between said compared signals; a quantization resolution determination module adapted to determine a quantizer resolution in accordance with a perceptual noise masking signal which is determined by a model of human audio perception; a quantizer adapted to quantize the second signal in accordance with the determined quantizer resolution; and a second signal generator adapted to generate a coded signal based on said quantized signal.
Claim 9
Dependent Claim
17 words
The system of claim 6 wherein the signal representing speech information comprises a linear prediction residual signal.
Claim 10
Dependent Claim
29 words
The system of claim 7 wherein the quantization resolution determination module comprises means for determining a noise masking threshold based on a frequency response of a quantized synthesis filter.
Claim 11
Dependent Claim
17 words
The system of claim 6 wherein the signal representing speech information comprises a pitch prediction residual signal.
Claim 12
Dependent Claim
25 words
The system of claim 6 wherein the signal representing speech information comprises a linear prediction residual signal which has been transformed into a frequency domain.
References Cited (Backward Citations)
USRE32580E
Cited
US4811396A
Cited
US4969192A
Cited
US4896362A
Cited
US5327520A
Cited
US5314457A
Cited
US5533052A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2001-01-19 | 2001-07-21 | 2002-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-01-19 | 2005-07-21 | 2006-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-01-19 | 2009-07-21 | 2010-01-20 | $7700.00 | Window Closed / Lapsed |