H - Electricity – 03 – M
Patent
H - Electricity
03
M
H03M 7/30 (2006.01) H04B 1/66 (2006.01) G10L 9/16 (1990.01)
Patent
CA 2083709
ABSTRACT In an efficient coding apparatus for a digital signal, which is adapted to transform an input digital signal to a signal on the frequency base to divide the signal on the frequency base into signal components every blocks to encode the signal components every blocks by adaptive allocated bit numbers, an approach is employed to orthogonally transform an input digital signal to divide the orthogonally transformed signal into signal components every critical band to encode those signal components by adaptive allocated bit numbers based on an allowed level every critical band to carry out floating processing thereof, wherein in the case of carrying out the floating processing every a plurality of small blocks each of which bandwidth is narrower than that of the critical band, an approach is employed to information of a word length of one small block of the small blocks in respective critical bands, whereby the number of bits for word length is reduced, thus making possible to carry out bit compression to higher degree. Further, in the case of carrying out the floating processing every a plurality of small blocks each of which bandwidth is narrower than that of the critical band, an approach is employed to transmit, in place of floating coefficients every respective critical bands, information of an allowed noise levels every critical band and word lengths of the small blocks, whereby the number of bits transmitted is reduced, thus making it possible to carry out bit compression to higher degree. In addition, in the case of carrying out the floating processing every small block of which bandwidth is narrower than that of the critical band, an approach is employed to transmit information of word lengths corresponding to allocated bit numbers, and to transmit, in place of floating coefficients, information, which is provided from a quantization table, relating to allowed noise levels each of which designation range is shifted in a lower level direction by a predetermined level from a signal level range in the critical band, whereby bit compression can be made to higher degree.
Gowling Lafleur Henderson Llp
Sony Corporation
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