Speech path system

Details Speech path system Speech path system

1976-02-26

1978-02-21

Robinson, Thomas A.

Communications: electrical

Land vehicle alarms or indicators

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

340166R, H04M 706, H04Q 300

Patent

active

040754316

ABSTRACT:
A speech path system for a telephone exchange having crosspoint switches of a speech path network comprising semiconductor switching devices of four or more layers, including a memory circuit for storing the operating conditions of said switching devices, a drive circuit of a high A.C. impedance for actuating said switching devices in response to output signals from said memory circuit, a subscriber D.C. loop detection circuit of a high impedance provided at a subscriber terminal of said speech path network, and a speech current supply circuit with speech current switching means and a supply current detection circuit provided at a trunk terminal of said speech path network.

REFERENCES:
patent: 3410961 (1968-11-01), Slana
patent: 3760361 (1973-09-01), Leger et al.
patent: 3801749 (1974-04-01), Jovic
patent: 3826873 (1974-07-01), Susi
patent: 3838223 (1974-09-01), Lee et al.
patent: 3865979 (1975-02-01), Hestad
patent: 3942040 (1976-03-01), Okuhara

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