发明名称 Encoding device, decoding device, and method thereof for specifying a band of a great error
摘要 Disclosed is an encoding device which can accurately specify a band having a large error among all the bands by using a small calculation amount. A first position identifier uses a first layer error conversion coefficient indicating an error of a decoding signal for an input signal so as to search for a band having a large error in a relatively wide bandwidth in all the bands of the input signal and generates first position information indicating the identified band. A second position identifier searches for a target frequency band having a large error in a relatively narrow bandwidth in the band identified by the first position identifier and generates second position information indicating the identified target frequency band. An encoder encodes a first layer decoding error conversion coefficient contained in the target frequency band.
申请公布号 US8935162(B2) 申请公布日期 2015.01.13
申请号 US201313966848 申请日期 2013.08.14
申请人 Panasonic Intellectual Property Corporation of America 发明人 Oshikiri Masahiro;Yamanashi Tomofumi;Morii Toshiyuki
分类号 G10L19/00;G10L19/02;G10L19/24 主分类号 G10L19/00
代理机构 Greenblum & Bernstein, P.L.C. 代理人 Greenblum & Bernstein, P.L.C.
主权项 1. A speech encoding apparatus, comprising: a first layer encoder that performs encoding processing, using a processor, with respect to an input speech signal to generate first layer encoded data; a first layer decoder that performs decoding processing, using the processor, using the first layer encoded data to generate a first layer decoded signal; a first layer error transform coefficient calculator that transforms, using the processor, a first layer error signal which is an error between the input speech signal and the first layer decoded signal into a frequency domain to calculate first layer error transform coefficients; and a second layer encoder that performs encoding processing, using the processor, with respect to the first layer error transform coefficients to generate second layer encoded data, wherein the second layer encoder: sets a low-frequency band and a high-frequency band for the first layer error transform coefficients, sets a fixed band in the high-frequency band and sets a plurality of band candidates in the low-frequency band;calculates perceptual weighted energy of the first layer error transform coefficients in each of the plurality of band candidates and selects one band from among the plurality of band candidates in the low-frequency band based on the perceptual weighted energy;concatenates the one band selected in the low-frequency band and the fixed band in the high-frequency band to configure a concatenated band; andencodes the first layer error transform coefficients included in the concatenated band to generate the second layer encoded data.
地址 Torrance CA US