Jun Matsumoto

TL;DR: A compressed digital speech signal is encoded to provide a transmission error-resistant transmission signal to support voiced/unvoiced sound discrimination and CRC codes are presented.

TL;DR: In this article, a high-efficiency method for encoding data on the frequency axis obtained by dividing an input audio signal in a block unit and converting it to frequency axis was proposed.

TL;DR: In this paper, a method and a device for discriminating a voiced sound from an unvoiced sound or background noise in speech signals are disclosed, where each block or frame of input speech signals is divided into plural sub-blocks and the standard deviation, effective value or the peak value is detected in a detection unit for detecting statistical characteristics from one sub-block to another.

TL;DR: A method and apparatus for encoding an input signal, such as a broad-range speech signal, in which a number of decoding operations with different bit rates are enabled for assuring a high encoding bit rate and for minimizing deterioration of the reproduced sound even with a low bit rate.

TL;DR: In this article, the degree of similarity between an input vector and all code vectors stored in the codebook is found by approximation for pre-selecting a smaller plural number of code vectors.