Coding Method, Decoding Method, Coder, and Decoder

• US 20190074847A1
• Filed: 11/08/2018
• Published: 03/07/2019
• 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
• Granted Patent: US 10,425,102 B2
• Time in Patent Office: Days
• 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, the pulse distribution comprising a quantity of pulse positions (N), and a vector P(N)={p(0), p(1), . . . , p(N−

1)} indicating a distribution of the pulse positions on the track and a quantity of the pulses 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 a permutation formula; and

determine a third index according to the quantity of the pulses in each of the pulse positions, the third index corresponding to the quantity of the pulses in each of the pulse positions; and

an index combining module configured to generate a coding index comprising the first index, the second index, and the third index.

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, and the index combining module being further configured to determine a pulse sign index corresponding to the pulse sign information after determining the third index, and the coding index further comprising 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, a value of the first index corresponding 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, the I2 representing the second index, the I3 representing the third index, and the W(N) representing a total quantity of all possible distributions of the pulse positions on the track.

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, the pulse distribution comprising a quantity of pulse positions (N), and a vector P(N)={p(0), p(1), . . . , p(N−

1)} indicating 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 a permutation formula;

determining, by a coding module, a third index according to the quantity of pulses in each of the pulse positions, the third index corresponding to the quantity of pulses in each of the pulse positions; and

generating, by an index combining module, a combined index for the track, the combined index comprising the first index, the second index, and the third index.

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, the combined index further comprising 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, a value of the first index corresponding 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, the I2 representing the second index, the I3 representing the third index, and the W(N) representing the total quantity of all possible distributions of the pulse positions on the track.

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

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

1)} indicating 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 a permutation formula;

determining a third index according to the quantity of pulses in each of the pulse positions, the third index corresponding to the quantity of pulses in each of the pulse positions; and

generating a combined index for the track, the combined index comprising the first index, the second index, and the third index.

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, the combined index further comprising 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, a value of the first index corresponding to an independent value range 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, the I2 representing the second index, the I3 representing the third index, and the W(N) representing the total quantity of all possible distributions of the pulse positions on the track.