Method and apparatus for resilient vector quantization
First Claim
Patent Images
1. A method for encoding an audio signal comprising:
- quantising a vector of a plurality of coefficients using a predictive mode of operation of a vector quantiser, wherein the vector quantiser can operate in either a predictive mode of operation or a non-predictive mode of operation, and wherein the plurality of coefficients are associated with a current frame of audio samples of the audio signal;
determining a vector of a plurality of recovered coefficients for the current frame of audio samples, wherein the plurality of recovered coefficients correspond to the vector of the plurality of coefficients when the vector of the plurality of coefficients is subjected to a frame erasure event, wherein the vector of the plurality of recovered coefficients is generated by at least part of a frame error concealment process, and wherein the least part of the frame error concealment process is equivalent to at least part of a frame error concealment process at a decoder arranged to de-quantise the vector of the plurality of coefficients;
comparing the vector of the plurality of coefficients to the vector of the plurality of recovered coefficients generated by the at least part of the frame error concealment process; and
using a result of the comparison of the vector of the plurality of coefficients to the vector of the plurality of recovered coefficients to determine the mode of operation of the vector quantizer for a frame of audio samples subsequent to the current frame of audio samples.
2 Assignments
0 Petitions
Accused Products
Abstract
It is inter alia disclosed to quantize a vector of a plurality of coefficients using a predictive mode of operation of a vector quantizer, wherein the vector quantizer can operate in either a predictive mode of operation or a non-predictive mode of operation, determine a vector of a plurality of recovered coefficients; compare the vector of the plurality of coefficients to the vector of the plurality of recovered coefficients; and determine the mode of operation of the vector quantizer for a vector of a plurality of coefficients associated with a subsequent frame of audio samples, wherein the mode of operation is dependent on the comparison.
-
Citations
14 Claims
-
1. A method for encoding an audio signal comprising:
-
quantising a vector of a plurality of coefficients using a predictive mode of operation of a vector quantiser, wherein the vector quantiser can operate in either a predictive mode of operation or a non-predictive mode of operation, and wherein the plurality of coefficients are associated with a current frame of audio samples of the audio signal; determining a vector of a plurality of recovered coefficients for the current frame of audio samples, wherein the plurality of recovered coefficients correspond to the vector of the plurality of coefficients when the vector of the plurality of coefficients is subjected to a frame erasure event, wherein the vector of the plurality of recovered coefficients is generated by at least part of a frame error concealment process, and wherein the least part of the frame error concealment process is equivalent to at least part of a frame error concealment process at a decoder arranged to de-quantise the vector of the plurality of coefficients; comparing the vector of the plurality of coefficients to the vector of the plurality of recovered coefficients generated by the at least part of the frame error concealment process; and using a result of the comparison of the vector of the plurality of coefficients to the vector of the plurality of recovered coefficients to determine the mode of operation of the vector quantizer for a frame of audio samples subsequent to the current frame of audio samples. - View Dependent Claims (2, 3, 4, 5, 6, 7)
-
-
8. An apparatus for encoding an audio signal comprising at least one processor and at least one memory including computer code for one or more programs, the at least one memory and the computer code configured with the at least one processor to cause the apparatus at least to:
-
quantise a vector of a plurality of coefficients using a predictive mode of operation of a vector quantiser, wherein the vector quantiser can operate in either a predictive mode of operation or a non-predictive mode of operation, and wherein the plurality of coefficients are associated with a current frame of audio samples of the audio signal; determine a vector of a plurality of recovered coefficients for the current frame of audio samples, wherein the plurality of recovered coefficients correspond to the vector of the plurality of coefficients when the vector of the plurality of coefficients is subjected to a frame erasure event, wherein the vector of the plurality of recovered coefficients is generated by at least part of a frame error concealment process, and wherein the least part of the frame error concealment process is equivalent to at least part of a frame error concealment process at a decoder arranged to de-quantise the vector of the plurality of coefficients; compare the vector of the plurality of coefficients to the vector of the plurality of recovered coefficients generated by the at least part of the frame error concealment process; and using a result of the comparison of the vector of the plurality of coefficients to the vector of the plurality of recovered coefficients to determine the mode of operation of the vector quantizer for a frame of audio samples subsequent to the current frame of audio samples. - View Dependent Claims (9, 10, 11, 12, 13, 14)
-
Specification