Fujitsu Corporation

Koso Murakami

Kazuo Hajikano

Toshio Shimoe

Ippei Sawaki

Kenichi Ogawa

Shunji Abe

Tetsuo Tachibana

Tetsuo Nishino

Osamu Isono

Toshimasa Fukui

Jyoei Kamoi

Eisuke Iwabuchi

Hichiro Hayami

Shoji Nojiri

Masayuki Kumazaki

Self-routing switching system with multiple link connections between

Non-blocking optical space switch

A switching system having a tone trunk which stores, in the digital memory thereof, a predetermined digital tone signal in the form of digital codes for supplying the corresponding analog tone signal to telephone sets of subscribers. The digital codes have been coded in such a way that the analog tone signal is accompanied by a quantizing noise having a characteristic of white noise.

Switching system having tone trunk

A switching system having a capability for telecommunication conferences, including therein, at least, a speech path memory, a mixing circuit, and a feedback circuit. The speech path memory is operative to store therein voice data signals provided from subscribers holding a conference. The mixing circuit is operative to mix two voice data signals. The feedback circuit is operative to feed the thus mixed voice data signals back to the speech path memory to accumulate therein each set of the mixed voice data signals for the subscriber's subscriber except each own voice data signal, whereby the subscribers receive respective accumulated voice data signals.

Switching system having capability for telecommunication conferences

Growing community of inventors

Yokohama, Japan

Koso Murakami