Masayuki Nishiguchi

TL;DR: In this article, a high efficiency encoding method for encoding data on frequency axis obtained by dividing an input audio signal on block-by-block basis and converting the signal onto the frequency axis, wherein V bands are searched for a band BVH with the highest center frequency if it is decided that there are one or more shift points of voiced (V)/unvoiced (UV) decision data of all bands on the frequency domain.

TL;DR: In this article, the frequency characteristics of high-frequency components of broad-band signals can be adjusted to the liking of the user, overflow due to addition is prevented from occurring without power variations being perceived by a user, the number of broad band formants is reduced, and emphasis is attached to the rough structure of the spectrum.

TL;DR: In this article, an apparatus and a method for encoding an input signal on the time base through orthogonal transform involves removing the correlation of signal waveform on the basis of the parameters obtained by means of linear predictive coding (LPC) analysis and pitch analysis.

TL;DR: In this article, a noise reducing method and device for reducing the noise contained in an input speech signal collects the speech signal with a microphone 11 and converts it into a digital input signal x(n) with an A/D converter 12.

TL;DR: In this article, an encoding unit for CELP encoding with a noise codebook memory containing codebook vectors generated by clipping Gaussian noise and learned using the code vectors obtained by learning using the Gaussian noises as initial values.