| 摘要 |
A sound signal encoder for high efficiency encoding of sound signals from a plurality of channels is provided which includes a to-be-correlated object setter ( 52 ), to-be-correlated object selector ( 56 ) and a variable-length encoder ( 58 ). The to-be-correlated object setter ( 52 ) sets, on the basis of left-channel frequency information held in a left-channel frequency information holder ( 50 ) and right-channel frequency information held in a right-channel frequency information holder ( 51 ), index [i] indicating which ones of sine waves on the left channel are to be correlated with, namely, are to be subtracted from, sine waves on the right channel. The to-be-correlated object selector ( 56 ) selects a default value read from a storage unit ( 55 ) or index [i]-th amplitude information read from a left-channel amplitude information holder ( 53 ) as an object to be subtracted from the i-th amplitude information on the right channel according to the index [i]. The variable-length encoder ( 58 ) makes variable-length encoding of a difference resulted from subtraction of the left-channel amplitude information or default value as the to-be-correlated object from the amplitude information on the right channel.
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