US 9,805,732 B2 · Frequency envelope vector quantization method and apparatus

Abstract

Embodiments of the present application proposes a frequency envelope vector quantization method and apparatus, where the method includes: dividing N frequency envelopes in one frame into N1 vectors; quantizing a first vector in the N1 vectors by using a first codebook, to obtain a code word corresponding to the quantized first vector, where the first codebook is divided into 2B1 portions; determining, according to the code word corresponding to the quantized first vector; determining a second codebook according to the codebook of the ith portion; and quantizing a second vector in the N1 vectors based on the second codebook. In the embodiments of the present application, vector quantization can be performed on frequency envelope vectors by using a codebook with a smaller quantity of bits. Therefore, complexity of vector quantization can be reduced, and an effect of vector quantization can also be ensured.

Claims12

Dependent claims

A method of quantizing frequency envelops of an audio signal, for use by an audio signal encoder, comprising:

obtaining N frequency envelopes of a frame of the audio signal, wherein N is a positive integer;
organizing the N frequency envelopes into N1 groups, wherein each group comprises M frequency envelopes, and wherein N1 and M are positive integers, M is greater than or equal to 2, and N is greater than N1;
quantizing a first group of frequency envelopes to obtain a first vector by using a first codebook wherein the first codebook has 2B code words and each code word corresponds to a vector, wherein the first codebook is divided into 2B1 portions, and wherein B is a positive integer greater than or equal to 2, and B1 is a positive integer greater than or equal to 1;
determining that a code word corresponding to the first vector is in the ith portion of the first codebook, wherein i is a positive integer greater than or equal to 1 and less than or equal to 2B1;
determining a second codebook according to the ith portion of the first codebook;
and
quantizing a second group of frequency envelopes by using the second codebook.

4 more elements

An audio signal encoding apparatus, comprising a processor and a memory storing program codes, wherein the program codes, when executed by the processor, cause the apparatus to perform a process that comprises:

obtaining N frequency envelopes of a frame of an audio signal, wherein N is a positive integer;
organizing the N frequency envelopes into N1 groups, wherein each group comprises M frequency envelopes, and wherein N1 and M are positive integers, M is greater than or equal to 2, and N is greater than N1;
quantizing a first group of frequency envelops to obtain a first vector by using a first codebook, wherein the first codebook has 2B code words and each code word corresponds to a vector, wherein the first codebook is divided into 2B1 portions, and wherein B is a positive integer greater than or equal to 2, and B1 is a positive integer greater than or equal to 1;
determining, that a code word corresponding to the first vector is in the ith portion of the first codebook, wherein i is a positive integer greater than or equal to 1 and less than or equal to 2B1;
determining a second codebook according to the ith portion;
and
quantizing a second group of frequency envelopes by using the second codebook.

4 more elements

Dependencies are inferred from the claim text.

Frequency envelope vector quantization method and apparatus

Life of this patent

Frequency envelope vector quantization method and apparatus

Life of this patent

Abstract

Claims12