Socionext Inc.

Mari Asami

Jun Ono

Tomoya Fujita

Yoshiteru Tsuchinaga

Miyuki Shirakawa

Shusaku Ito

Sosaku Moriki

An audio signal coding device divides a frequency spectrum obtained from an input digital signal to a plurality of bands, scales and quantizes divided frequency spectra based on a scalefactor of each of the bands and a common scale which is common to the plurality of bands, and codes quantized frequency spectra. The audio signal coding device includes a band number determination unit configured to calculate a number of coding bands for coding the quantized frequency spectra, and a common scale estimation unit configured to estimate the common scale in accordance with the number of coding bands.

Audio signal coding device and audio signal coding method

An audio signal encoding device includes: a window determination unit for determining the type of window of each channel; a correction unit for correcting the number of available bits; and a quantization unit for quantizing the audio signal of each channel sequentially so that the number of bits is equal to or less than the corrected number of available bits while adding the number of bits left unused, and the correction unit includes: a use rate history calculation unit for calculating a bit use rate in quantization of each type of window; and a corrected bit number calculation unit for correcting the number of available bits so that the rate of used bits to the number of available bits of each channel on the assumption that quantization is performed with the calculated bit use rate in quantization approaches the same.

Audio signal encoding method and device

Growing community of inventors

Kawasaki, Japan

Mari Asami