Akitoshi Kataoka

TL;DR: By subjective evaluations, it is shown that the speech quality can be maintained even when the speech signals are partially mixed, and a partial mixing method is proposed that effectively reduces the mixing complexity in multiple-point remote conferences.

TL;DR: In this article, a feature extraction part 66 extracts its feature at every short time frame of the input acoustic signal to control the mode switchover part 65, which divides the input signal into four sub-frames, and obtains the mean power or mean spectrum envelope of respective divided sub-frame, and controls the mode switching part 65 so as to select the coding by the first coding part 12 when the change rate is a prescribed value or above, and by the second coding part 41 under the prescribed values or below.

TL;DR: Simulation showed that the proposed enhancement leads to a faster decrease in misalignment than the corresponding conventional second-order affine projection algorithm while computational complexities are almost the same.

TL;DR: In this article, a first prediction coder codes input voice to obtain the difference signal (43) between its decoding signal and the input voice, and then selects the noise vector and its gain to mininmize the distortion power of the synthesizing signal to the difference signals.

TL;DR: An encoding part (11) encodes an input sound, a decoding part (12) decodes the encoded sound, and a complementing sound creating part (20) uses a previous decoded signal to create a complementary sound that complements the sound of a current frame.