Fujitsu Corporation

Takao Matsuda

Yuichi Sato

Koji Maruyama

Naoji Fujino

Toshiaki Nobumoto

Mitsuru Tsuboi

Takahiro Aramaki

Shoji Tominaga

Ken-ichi Abiru

Naomi Nishiyama

Syoji Tominaga

Yukihiro Ando

The high performance multiplexed transmission system of this invention is configured by a sound coding unit for coding voice input information by separating it into a core information part for assuring the minimum acceptable sound quality and a supplementary information part discardable in stages per the transmission priorities. There is a silent section detecting unit for detecting silent sections of voice input information. In addition, there is a multiplexing unit for multiplexing only the information synchronizing with the correspondent's coder for the voice channels from which no sound is detected, or first the core information part and second the supplementary information part from the ones with the highest priorities in stages in fixed length frames, for discarding the supplementary information parts, which cannot be multiplexed because of a band deficiency.

High performance digitally multiplexed transmission system

The period of a sound-existence/sound-silence of a speech signal is detected. Packet data is inserted in a speech time slot during the period of non-existence of sound in the speech signal. A time slot is also given to the non-speech data requiring a quick response in transmission so that the non-speech data is multiplexed with the speech signal for transmission. Data-non-existence of non-speech data is detected when the non-speech data does not exist and then the packet data is inserted into a time slot of the non-speech data for transmission.

Highly efficient multiplexing system

Growing community of inventors

Yokohama, Japan

Takao Matsuda