US 8,711,012 B2Granted

Encoding method, decoding method, encoding device, decoding device, program, and recording medium

AssigneeNippon Telegraph and Telephone Corporation

InventorsMasahiro Fukui, Shigeaki Sasaki, Yusuke Hiwasaki, Shoichi Koyama, Kimitaka Tsutsumi

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Abstract

A plurality of samples are vector-quantized to obtain a vector quantization index and quantized values; bits are assigned in a predetermined order of priority based on auditory perceptual characteristics to one or more sets of sample positions among a plurality of sets of sample positions, each set having a plurality of sample positions and being given an order of priority based on the auditory perceptual characteristics, the number of bits not being larger than the number of bits obtained by subtracting the number of bits used for a code corresponding to the vector quantization index from the number of bits assigned for the code corresponding to the vector quantization index; and index information indicating a group of coefficients that minimizes the sum of the error between the value of each sample included in each of the sets of sample positions to which the bits are assigned and the value obtained by multiplying the quantized value of each sample included in the set of sample positions by a coefficient corresponding to the position of the sample, of all the sample positions included in the set of sample positions, is output.

Claims18

Dependent claims

An encoding method comprising:

a vector quantization step of vector-quantizing a plurality of samples collectively to obtain a vector quantization index and the quantized value of each of the plurality of samples;
a bit assignment step of assigning bits in a predetermined order of priority based on auditory perceptual characteristics to one or more sets of sample positions among a plurality of sets of sample positions, each set comprising a plurality of sample positions and being given an order of priority based on the auditory perceptual characteristics, the number of bits not being larger than the number of bits obtained by subtracting the number of bits used for a code corresponding to the vector quantization index from the number of bits assigned for the code corresponding to the vector quantization index;
and
a coefficient group selection step of outputting index information indicating a group of coefficients that minimizes the sum of the error between the value of each sample included in each of the sets of sample positions to which the bits are assigned in the bit assignment step and the value obtained by multiplying the quantized value of each sample included in the set of sample positions by a coefficient corresponding to the position of the sample, of all the sample positions included in the set of sample positions, among a plurality of groups of predetermined coefficients corresponding to the positions of the samples.

1 more element

A decoding method comprising:

a vector decoding step of obtaining a plurality of values corresponding to an input vector quantization index as decoded values corresponding respectively to a plurality of sample positions;
and
a coefficient multiplication step of outputting, with a set of sample positions to which bits are assigned in a predetermined order of priority based on auditory perceptual characteristics being considered as a target of processing among a plurality of sets of sample positions that constitute the plurality of sample positions, and with the use of a group of predetermined coefficients corresponding to the plurality of sample positions and indicated by input index information, the values obtained by multiplying the decoded values and the coefficients corresponding to the sample positions included in the set of sample positions considered as the target of processing.

An encoding device comprising:

a vector quantizer that vector-quantizes a plurality of samples collectively to obtain a vector quantization index and the quantized value of each of the plurality of samples;
a bit assignment unit that assigns bits in a predetermined order of priority based on auditory perceptual characteristics to one or more sets of sample positions among a plurality of sets of sample positions, each set comprising a plurality of sample positions and being given an order of priority based on the auditory perceptual characteristics, the number of bits not being larger than the number of bits obtained by subtracting the number of bits used for a code corresponding to the vector quantization index from the number of bits assigned for the code corresponding to the vector quantization index;
and
a coefficient group selection unit that outputs index information indicating a group of coefficients that minimizes the sum of the error between the value of each sample included in each of the sets of sample positions to which the bits are assigned by the bit assignment unit and the value obtained by multiplying the quantized value of each sample included in the set of sample positions by a coefficient corresponding to the position of the sample, of all the sample positions included in the set of sample positions, among a plurality of groups of predetermined coefficients corresponding to the positions of the samples.

1 more element

Dependencies are inferred from the claim text.