US5086471A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gain-shape vector quantization apparatus
Assignee: Fujitsu Ltd
•
Filing: 1990-06-29
•
Granted: 1992-02-04
•
Expires: 2010-06-29
Abstract
Abstract A gain-shape vector quantization apparatus for compressing the data of voice signal. A code book portion is constituted by a plurality of shape vectors which produce a plurality of selected shape vectors. A plurality of variable gain circuits impart gains to each shape vector produced from the code book portion. A plurality of synthesis filters regenerate signals from the outputs of the variable gain circuits. An adder adds the signals regenerated by the synthesis filters. An evaluation unit produces an index to select a plurality of shape vectors in the code book portion in order to minimize an error between the output of the adder and an input speech signal and further produces gain adjusting signal for the variable gain circuits.
Inventors
- 👤 Yoshinori Tanaka
- 👤 Tomohiko Taniguchi
- 👤 Fumio Amano
- 👤 Yasuji Ohta
- 👤 Shigeyuki Unagami
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:42
CPC Classifications
G; G10; G10L; G10L19/00; G10L19/04; G10L19/08; G10L19/083; G06; G06T; G06T9/00; G06T9/008; H; H03; H03M; H03M7/00; H03M7/30; H03M7/3082
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
225 words
A gain-shape vector quantization apparatus for an input speech signal, said apparatus comprising: a code book portion containing a plurality of shape vectors and selecting among the shape vectors upon receipt of an index signal; a gain circuit portion including a plurality of variable gain circuits coupled in parallel to said code book portion to impart predetermined gains to the shape vectors selected by said code book portion; a synthesis filter portion including a plurality of synthesis filters coupled in parallel to said gain circuit portion to reproduce signals from the shape vectors as output by said variable gain circuits in said gain circuit portion; a first adder portion coupled to said synthesis filter portion to add the signals reproduced by said synthesis filters in said synthesis filter portion and to produce an output; a second adder portion coupled to said first adder portion to add the output of said first adder portion and the input speech signal to determine an error; and an evaluation unit coupled to said second adder and said code book portion to determine the index signal used in the selection of the shape vectors stored in said code book portion to minimize the error between the output of said first adder portion and the input speech signal produced by said second adder portion, and supplied to said code book portion.
Claim 2
Dependent Claim
225 words
A gain-shape vector quantization apparatus for an input speech signal, said apparatus comprising: a code book portion containing a plurality of shape vectors and selecting among the shape vectors upon receipt of an index signal; a gain circuit portion including a plurality of variable gain circuits coupled in parallel to said code book portion to impart predetermined gains to the shape vectors selected by said code book portion; a synthesis filter portion including a plurality of synthesis filters coupled in parallel to said gain circuit portion to reproduce signals from the shape vectors as output by said variable gain circuits in said gain circuit portion; a first adder portion coupled to said synthesis filter portion to add the signals reproduced by said synthesis filters in said synthesis filter portion and to produce an output; a second adder portion coupled to said first adder portion to add the output of said first adder portion and the input speech signal to determine an error; and an evaluation unit coupled to said second adder and said code book portion to determine the index signal used in the selection of the shape vectors stored in said code book portion to minimize the error between the output of said first adder portion and the input speech signal produced by said second adder portion, and supplied to said code book portion.
Claim 3
Dependent Claim
44 words
A gain-shape vector quantization apparatus according to claim 1, wherein said evaluation unit is coupled to said gain circuit portion and supplies gain adjusting signals to each of said variable gain circuits in said gain circuit portion such that the error becomes the smallest.
Claim 4
Dependent Claim
29 words
A gain-shape vector quantization apparatus according to claim 1, wherein said code book portion includes a plurality of code book storage units each having a plurality of shape vectors.
Claim 5
Dependent Claim
65 words
A gain-shape vector quantization apparatus according to claim 1, wherein said code book portion includes a code book storage unit having a plurality of shape vectors, and a mapping table coupled to said code book storage unit to simultaneously select and produce a plurality of dissimilar shape vectors from said code book storage unit in response to the index signal produced by said evaluation unit.
References Cited (Backward Citations)
US3631520A
Cited
US4133976A
Cited
US4220819A
Cited
US4472832A
Cited
JPS6331222A
Cited
US4797925A
Cited
JPS6387034A
Cited
US4868867A
Cited
US4969192A
Cited
EP0314018A2
Cited
US4922508A
Cited
US4817157A
Cited
JPH01191510A
Cited
JPH01243098A
Cited
US4975958A
Cited
US4956871A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-02-03 | 1995-08-05 | 1996-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-02-03 | 1999-08-05 | 2000-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-02-03 | 2003-08-05 | 2004-02-04 | $7700.00 | Window Closed / Lapsed |