Coding method, decoding method, coder, and decoder

• US 10,425,102 B2
• Filed: 11/08/2018
• Issued: 09/24/2019
• Est. Priority Date: 04/29/2007
• Status: Active Grant

• Current Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Original Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Inventors: Ma, Fuwei, Zhang, Dejun
• Primary Examiner(s): Mai, Lam T
• Application Number:
  US16/184,240
• Publication Number:
  US 20190074847A1
• Time in Patent Office: 320 Days
• Field of Search: 341 51- 70
• CPC Class Codes: G10L 19/08 Determination or coding of the excitation function; Determination or coding of the long-term prediction parameters
• CPC Class Codes: G10L 19/10 the excitation function being a multipulse excitation
• CPC Class Codes: H03M 7/3082 Vector coding for television signals, see H04N19/94

Abstract

A coding method, a decoding method, a coder, and a decoder, where the coding method includes obtaining the pulse distribution, on a track, of the pulses to be encoded on the track, determining a distribution identifier for identifying the pulse distribution according to the pulse distribution, and generating a coding index that includes the distribution identifier. The decoding method includes receiving a coding index, obtaining a distribution identifier from the coding index, wherein the distribution identifier is configured to identify the pulse distribution, on a track, of the pulses to be encoded on the track, determining the pulse distribution, on a track, of all the pulses to be encoded on the track according to the distribution identifier, and reconstructing the pulse order on the track according to the pulse distribution.

Claims

1. A coder for coding an audio signal sample, comprising:

a pulse statistic module configured to obtain a pulse distribution of pulses to be encoded on a track of the audio signal sample, wherein the pulse distribution comprises a quantity of pulse positions (N), and wherein a vector P(N)={p(0), p(1), . . . , p(N−

1)} indicates a distribution of the pulse positions on the track and a quantity of the pukes in each of the pulse positions;

an index calculating module configured to determine a first index according to the N;

a coding module configured to;

determine a second index using the following permutation formula according to the distribution of the pulse positions on the track;

2. The coder of claim 1, wherein the pulse statistic module is further configured to obtain pulse sign information indicating positive and negative features of the pulses, wherein the index combining module is further configured to determine a pulse sign index corresponding to the pulse sign information after determining the third index, and wherein the coding index further comprises the pulse sign index corresponding to the pulse sign information for each pulse.

3. The coder of claim 1, wherein the index combining module is further configured to:

overlay information about other indices with the first index used as a start value, wherein a value of the first index corresponds to an independent value range of the coding index; and

overlay a combination of the second index and the third index according to I3×

W(N)+I2, wherein the I2 represents the second index, wherein the I3 represents the third index, and wherein the W(N) represents a total quantity of all possible distributions of the pulse positions on the track.

10. The coder of claim 1, wherein the pulses to be encoded include signs, and wherein the index combining module is configured to generate the coding index by combining sign index information into the coding index.

11. The coder of claim 1, wherein a coding method is selected according to a total quantity of the pulses to be encoded on a same track.

12. The coder of claim 1, wherein the coder is configured to agree to a coding method with a decoder before the coder sends the coding index to the decoder.

4. A method for coding of an audio signal sample, comprising:

obtaining, by a pulse statistic module, a pulse distribution of pulses to be encoded on a track of the audio signal sample, wherein the pulse distribution comprises a quantity of pulse positions (N), and wherein a vector P(N)={p(0), p(1), . . . , p(N−

1)} indicates a distribution of the pulse positions on the track and a quantity of pulses in each of the pulse positions;

determining, by an index calculating module, a first index from a lookup table according to the N;

determining, by the index calculating module, a second index using the following permutation formula according to the distribution on the pulse positions on the track;

5. The method of claim 4, further comprising:

obtaining, by the pulse statistic module, pulse sign information indicating positive and negative features of each pulse; and

determining, by the index combining module, a pulse sign index corresponding to the pulse sign information after determining the third index, wherein the combined index further comprises the pulse sign index corresponding to each pulse.

6. The method of claim 5, further comprising:

overlaying, by the index combining module, information about other indices with the first index used as a start value, wherein a value of the first index corresponds to an independent value range of the combined index; and

overlaying, by the index combining module, the combination of the second index and the third index according to the following equation;

I3×

W(N)+I2, wherein the I2 represents the second index, wherein the I3 represents the third index, and wherein the W(N) represents the total quantity of all possible distributions of the pulse positions on the track.

13. The method of claim 4, wherein the pulses to be encoded include signs, and wherein the method further comprises generating the coding index by combining sign index information into the coding index.

14. The method of claim 4, further comprising selecting a coding method according to a total quantity of the pulses to be encoded on a same track.

15. The method of claim 4, further comprising agreeing to a coding method with a decoder before sending the coding index to the decoder.

7. A computer program product comprising a non-transitory computer readable storage medium storing program code thereon for coding of an audio signal sample, wherein the program code comprises instructions for executing a method that comprises:

obtaining a pulse distribution of pulses to be encoded on a track of the audio signal sample, wherein the pulse distribution comprises a quantity of pulse positions (N), and wherein a vector P(N)={p(0), p(1), . . . , p(N−

1)} indicates a distribution of the pulse positions on the track and a quantity of pulses in each of the pulse positions;

determining a first index from a lookup table according to the N;

determining a second index using the following permutation formula according to the distribution of the pulse positions on the track;

8. The computer program product of claim 7, wherein the method further comprises:

obtaining pulse sign information indicating positive and negative features of each pulse; and

determining a pulse sign index corresponding to the pulse sign information after determining the third index, wherein the combined index further comprises the pulse sign index corresponding to each pulse.

9. The computer program product of claim 8, wherein the method further comprises:

overlaying information about other indices with the first index used as a start value, wherein a value of the first index corresponds to an independent value rage of the combined index; and

overlaying the combination of the second index and the third index according to the following equation;

I3×

W(N)+I2, wherein the I2 represents the second index, wherein the I3 represents the third index, and wherein the W(N) represents the total quantity of all possible distributions of the pulse positions on the track.

16. The computer program product of claim 7, wherein the pulses to be encoded include signs, and wherein the method further comprises generating the coding index by combining sign index information into the coding index.

17. The computer program product of claim 7, wherein the method further comprises selecting a coding method according to a total quantity of the pulses to be encoded on a same track.

18. The computer program product of claim 7, wherein the method further comprises agreeing to a coding method with a decoder before sending the coding index to the decoder.