Multiplex communications – Wide area network – Packet switching
Patent
1984-04-02
1986-05-27
Olms, Douglas W.
Multiplex communications
Wide area network
Packet switching
3701101, 179 18AB, 179 81R, H04Q 1104, H04J 312, H04M 300, H04M 100
Patent
active
045920460
ABSTRACT:
A click tone removing system for a time division switching system which performs switching of speech channels by a highway switch inserted in a highway. When a hook information detector and a dial information detector detect hook information and a dial information, respectively, delivery of a PCM speech sending signal to the highway is prevented by a blocking function for a fixed period of time, so that the highway is controlled to switch the speech channel, thereby removing a click tone generated by dialing. A subscriber's circuit of an exchange, which changes over a speech sending highway and a speech receiving highway by means of a highway switch, is characterized by the provision of an A/D converter for digitizing a speech sending signal to a digitized speech sending signal sent out to the speech sending highway, a D/A converter for converting a digitized speech receiving signal applied from the speech receiving highway into an analog signal, a gate for gating the input signal to the D/A converter, and a control circuit for controlling the gate, so that during real time processing the speech receiving signal highway is interrupted by opening and closing the gate without controling the higway switch.
REFERENCES:
patent: 3939311 (1976-02-01), Smith
patent: 4081619 (1978-03-01), Losehand
patent: 4135061 (1979-01-01), Pincemin
patent: 4232293 (1980-11-01), Harris
patent: 4345115 (1982-08-01), Sweet
W. D. Pace, "LSI for Telecommunications", Telecommunications, Apr. 1984, pp. 43-48.
Inomata Tetsuro
Kawata Yoshihiro
Matsufuji Teruo
Miyashita Hiroyuki
Sakata Tsunetaka
Adams Bruce L.
Burns Robert E.
Chin Wellington
Iwasaki Tsushinki Kabushiki Kaisha
Lobato Emmanuel J.
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