| 摘要 |
A stereo signal converter capable of realizing encoding with less redundancy, low bit-rate, and high quality even if the positions of sound sources are different from one another. In this device, a sample difference analyzing section (111) uses the signal in which a right-channel signal is shifted by a sample difference (d) in terms of time and a left-channel signal to compute a sample difference (D) in which the correlation becomes highest. A sample difference value computing section (112) computes a sample difference value (z) (the value to shift the right-channel signal in the current frame) on the basis of the value after the right-channel signal is shifted in the previous frame and the sample difference (D). A sample difference value encoding section (113) encodes the sample difference value (z). A slide section (114) shifts the right-channel signal by the sample difference value (z) in terms of time. A sum difference computing section (115) adds the left-channel signal and the shifted right-channel signal to generate a monaural signal and subtracts the shifted right-channel signal from the left-channel signal to generate a side signal.
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