| 摘要 |
A sound encoding device for efficiently encoding stereophonic sound. In this sound encoding device, a prediction parameter analyzing section (21) determines the delay difference D and the amplitude ratio g of a first-channel sound signal with respect to a second-channel sound signal as channel-to-channel prediction parameters from a first-channel decoded signal and a second-channel sound signal, a prediction parameter quantizing section (22) quantizes the prediction parameters, a signal predicting section (23) predicts a second-channel signal by using the first decoded signal and the quantization prediction parameters. The prediction parameter quantizing section (22) encodes and quantizes the prediction parameters (the delay difference D and the amplitude ratio g) by using the relationship (correlation) between the delay difference D and the amplitude ratio g attributed to the spatial characteristic (e.g., distance) from the sound source of the signal to the receiving point. |
