Semiconductor speech path switch

Details Semiconductor speech path switch Semiconductor speech path switch

1974-10-22

1978-04-04

Brown, Thomas W.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

340166R, H04Q 352

Patent

active

040829235

ABSTRACT:
A plurality of sets of thyristors, each set consisting of two thyristors connected in inverse parallel configuration, are arranged in the form of a matrix to provide a switch of balanced or unbalanced type. A control circuit is provided which feeds successive pulses or light energy whose repetition rate is higher than the frequency of the ac signal such as a ringing signal passing through the speech paths, to the thyristors at a cross-point to be closed, during the time required for exchange operation. In this way, a speech path switch can be constituted of semiconductor elements and ringing, dialing and hooking signals can be treated together with speech signals.

REFERENCES:
patent: 3491209 (1970-01-01), Relsted
patent: 3504131 (1970-03-01), Slana et al.
patent: 3601547 (1971-08-01), Potter
patent: 3720792 (1973-03-01), Resta
patent: 3735057 (1973-05-01), Bryan
patent: 3760361 (1973-09-01), Leger et al.
patent: 3826873 (1974-07-01), Susi
patent: 3832495 (1974-08-01), Hovagimyan et al.
patent: 3865978 (1975-02-01), Hestad
"PNPN Light Emitting Diode", IBM Technical Disclosure Bulletin, vol. 14, No. 4, Sept. 1971, pp. 1325, 1326.
SCR Manual, 4th Ed., General Electric, 1967-pp. 143, 144, 294,295.

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