CA2598870A1 - Multi-stage vector quantization apparatus and method for speech encoding - Google Patents
Multi-stage vector quantization apparatus and method for speech encoding Download PDFInfo
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- CA2598870A1 CA2598870A1 CA002598870A CA2598870A CA2598870A1 CA 2598870 A1 CA2598870 A1 CA 2598870A1 CA 002598870 A CA002598870 A CA 002598870A CA 2598870 A CA2598870 A CA 2598870A CA 2598870 A1 CA2598870 A1 CA 2598870A1
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- vector
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- quantization
- code vector
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Abstract
A CELP speech coder/decoder capable of accepting a quantization algorithm in a quantizing section using a multi-stage predictive vector quantization method. The vector quantization of a target is carried out in the multistage predictive vector quantization. The target is obtained and is further vector-quantized. A vector of a first target vector is predicted by a predicting section. The searching section carries out the decoding of the vector using decoded vectors from vector codebooks based on the codes for codevector A and codevector B. The amplitude is obtained from the amplifer storing section and past-decoded vectors stored in the state storing section. The apparatus and method reduce the coded distortion. The apparatus may be employed in speech coding and/or decoding for music, images, or in cellular phones.
Claims (4)
1. A vector quantizatlon apparatus for performing coding of a target vector by multi-stage vector quantization, the apparatus comprising:
a first quantizing section for performing a first stage of the coding of the target vector using a first code vector stored in a first codebook;
an amplifier storing section for storing a scalar associated with a code of each first code vector, and a second quantizing section for determining a third code vector by multiplying a second code vector stored in a second codebook and the scalar together, performing distance calculation using the target vector, the first code vector, and the third code vector and performing a second stage of the coding of the target vector using a result of the distance calculation.
a first quantizing section for performing a first stage of the coding of the target vector using a first code vector stored in a first codebook;
an amplifier storing section for storing a scalar associated with a code of each first code vector, and a second quantizing section for determining a third code vector by multiplying a second code vector stored in a second codebook and the scalar together, performing distance calculation using the target vector, the first code vector, and the third code vector and performing a second stage of the coding of the target vector using a result of the distance calculation.
2. The vector quantization apparatus according to claim 1 wherein the second code vector stored in the second codebook is obtained by a computation using an amount of sample vectors for learning.
3. A vector quantization method for performing coding of a target vector by multi-stage vector quantization, the method comprising the steps of:
reading a first code vector from a first codebook and performing a first stage of the coding of the target vector using the first code vector, reading a scalar associated with a code of each first code vector from an amplifier storage;
reading a second code vector from a second codebook, and determining a third code vector by multiplying the second code vector and the scalar together;
performing distance calculation using the target vector, the first code vector and the third code vector, performing a second stage of the coding of the target vector using a result of the distance calculation.
reading a first code vector from a first codebook and performing a first stage of the coding of the target vector using the first code vector, reading a scalar associated with a code of each first code vector from an amplifier storage;
reading a second code vector from a second codebook, and determining a third code vector by multiplying the second code vector and the scalar together;
performing distance calculation using the target vector, the first code vector and the third code vector, performing a second stage of the coding of the target vector using a result of the distance calculation.
4. The vector quantization method according to claim 3, wherein the second code vector stored in the second codebook is obtained by a computation using an amount of sample vectors for learning.
Applications Claiming Priority (7)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28941297A JP3235543B2 (en) | 1997-10-22 | 1997-10-22 | Audio encoding / decoding device |
| JP9-289412 | 1997-10-22 | ||
| JP9-295130 | 1997-10-28 | ||
| JP29513097A JP3175667B2 (en) | 1997-10-28 | 1997-10-28 | Vector quantization method |
| JP10-085717 | 1998-03-31 | ||
| JP08571798A JP3174756B2 (en) | 1998-03-31 | 1998-03-31 | Sound source vector generating apparatus and sound source vector generating method |
| CA002494946A CA2494946C (en) | 1997-10-22 | 1998-10-22 | Speech coder and speech decoder |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002494946A Division CA2494946C (en) | 1997-10-22 | 1998-10-22 | Speech coder and speech decoder |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2598870A1 true CA2598870A1 (en) | 1999-04-29 |
| CA2598870C CA2598870C (en) | 2012-03-27 |
Family
ID=35767601
Family Applications (4)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2598780A Expired - Lifetime CA2598780C (en) | 1997-10-22 | 1998-10-22 | A method and apparatus for generating dispersed vectors |
| CA2598870A Expired - Lifetime CA2598870C (en) | 1997-10-22 | 1998-10-22 | Multi-stage vector quantization apparatus and method for speech encoding |
| CA2528645A Expired - Lifetime CA2528645C (en) | 1997-10-22 | 1998-10-22 | Speech coder and speech decoder, orthogonal search method and speech coding method |
| CA2598683A Expired - Lifetime CA2598683C (en) | 1997-10-22 | 1998-10-22 | A speech encoder and method of speech encoding |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2598780A Expired - Lifetime CA2598780C (en) | 1997-10-22 | 1998-10-22 | A method and apparatus for generating dispersed vectors |
Family Applications After (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2528645A Expired - Lifetime CA2528645C (en) | 1997-10-22 | 1998-10-22 | Speech coder and speech decoder, orthogonal search method and speech coding method |
| CA2598683A Expired - Lifetime CA2598683C (en) | 1997-10-22 | 1998-10-22 | A speech encoder and method of speech encoding |
Country Status (1)
| Country | Link |
|---|---|
| CA (4) | CA2598780C (en) |
-
1998
- 1998-10-22 CA CA2598780A patent/CA2598780C/en not_active Expired - Lifetime
- 1998-10-22 CA CA2598870A patent/CA2598870C/en not_active Expired - Lifetime
- 1998-10-22 CA CA2528645A patent/CA2528645C/en not_active Expired - Lifetime
- 1998-10-22 CA CA2598683A patent/CA2598683C/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| CA2598683C (en) | 2011-08-09 |
| CA2528645C (en) | 2010-07-20 |
| CA2598780C (en) | 2011-08-09 |
| CA2528645A1 (en) | 1999-04-29 |
| CA2598683A1 (en) | 1999-04-29 |
| CA2598870C (en) | 2012-03-27 |
| CA2598780A1 (en) | 1999-04-29 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKEX | Expiry |
Effective date: 20181022 |
|
| MKEX | Expiry |
Effective date: 20181022 |