CA2301994C - High quality speech coder at low bit rates - Google Patents
High quality speech coder at low bit rates Download PDFInfo
- Publication number
- CA2301994C CA2301994C CA002301994A CA2301994A CA2301994C CA 2301994 C CA2301994 C CA 2301994C CA 002301994 A CA002301994 A CA 002301994A CA 2301994 A CA2301994 A CA 2301994A CA 2301994 C CA2301994 C CA 2301994C
- Authority
- CA
- Canada
- Prior art keywords
- computer
- correlation
- pulse data
- speech coder
- computing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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- Compression, Expansion, Code Conversion, And Decoders (AREA)
Abstract
In a speech coder, a spectral parameter computer obtains a plurality of spectral parameters from an input speech signal and quantizes the obtained spectral parameters. Even at low bit rates, the speech coder requires relatively less computational effort and experiences less sound quality deterioration.
Claims
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A speech coder comprising a spectral parameter computer for obtaining spectral parameters from an input speech signal and quantizing the spectral parameters thus obtained, an impulse response computer for computing impulse responses corresponding to the spectral parameters, a first correlation computer for computing correlations of the input signal and the impulse response, a second correlation computer for computing correlations among the impulse responses, a first pulse data computer for computing positions of first M1 pulses, wherein M1 >= 2 from the outputs of the first and second correlation computers, a third correlation computer for correcting the output of the first correlation computer by using the output of the first M1 pulse data computer, and a second pulse data computer for jointly computing positions of second M2 pulses, wherein M2 >= 2, from the output of the third and second correlation computers, the pulse data computation being made by executing the correlation correction and the pulse data computation iteratedly a predetermined number of times.
Applications Claiming Priority (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP26112196A JP3360545B2 (en) | 1996-08-26 | 1996-08-26 | Audio coding device |
JP261121/1996 | 1996-08-26 | ||
JP307143/1996 | 1996-10-31 | ||
JP30714396A JP3471542B2 (en) | 1996-10-31 | 1996-10-31 | Audio coding device |
CA002213909A CA2213909C (en) | 1996-08-26 | 1997-08-25 | High quality speech coder at low bit rates |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CA002213909A Division CA2213909C (en) | 1996-08-26 | 1997-08-25 | High quality speech coder at low bit rates |
Publications (2)
Publication Number | Publication Date |
---|---|
CA2301994A1 CA2301994A1 (en) | 1998-02-26 |
CA2301994C true CA2301994C (en) | 2004-10-26 |
Family
ID=27170442
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CA002301995A Expired - Fee Related CA2301995C (en) | 1996-08-26 | 1997-08-25 | High quality speech coder at low bit rates |
CA002301994A Expired - Fee Related CA2301994C (en) | 1996-08-26 | 1997-08-25 | High quality speech coder at low bit rates |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CA002301995A Expired - Fee Related CA2301995C (en) | 1996-08-26 | 1997-08-25 | High quality speech coder at low bit rates |
Country Status (1)
Country | Link |
---|---|
CA (2) | CA2301995C (en) |
-
1997
- 1997-08-25 CA CA002301995A patent/CA2301995C/en not_active Expired - Fee Related
- 1997-08-25 CA CA002301994A patent/CA2301994C/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
CA2301994A1 (en) | 1998-02-26 |
CA2301995A1 (en) | 1998-02-26 |
CA2301995C (en) | 2005-10-18 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
EEER | Examination request | ||
MKLA | Lapsed |