Patent ID: 7734053
Filing Date: 2010-06-08
Classification: G10L

Abstract:
1. An encoding apparatus that compresses a stereo signal using a sum signal and a difference signal of a left component signal and a right component signal of the stereo signal, comprising: a transforming unit configured to transform a left spectrum signal and a right spectrum signal to produce a sum signal and a difference signal; a comparing unit configured to compare a value indicative of an output of the difference signal with a threshold for each frequency band; a correcting unit configured to correct the value to zero when the value is lower than the threshold; a calculating unit configured to calculate complexity of the sum signal and complexity of the difference signal; a setting unit configured to set, based on the complexity, an allocation rate of bits to be allocated in quantizing the sum signal and the difference signal; and a quantizing unit configured to quantize the sum signal and the difference signal based on the allocation rate, wherein the calculating unit includes: