Encoding apparatus, decoding apparatus, encoding method, and decoding method for adjusting a spectrum amplitude

摘要

An encoding device is provided for increasing the quality of an encoded signal, even when encoding music signals. In the encoding device, a Code-Excited Linear Prediction (CELP) encoder generates first encoded data by encoding an input signal, and a CELP decoder generates a decoded signal by decoding the first encoded data input from the CELP encoder. Additionally, a characteristic parameter encoder calculates a parameter that expresses the degree of fluctuation in the ratio of the peak components and the floor components between the spectra of the decoded signal and the input signal.

主权项

1. An encoding apparatus, comprising:
a first encoder that performs code excited linear prediction (CELP) encoding on an input signal to generate first encoded data; a decoder that performs CELP decoding on the first encoded data to generate a CELP decoded signal; a second encoder that calculates a parameter indicating an amount of fluctuation between a first ratio and a second ratio, and encodes the parameter to generate second encoded data, the first ratio being a ratio between peak components and floor components of spectra of the CELP decoded signal and the second ratio being a ratio between peak components and floor components of spectra of the input signal; and a multiplexing section that multiplexes and outputs the first encoded data and the second encoded data.