Precise tone signal generator

Details Precise tone signal generator Precise tone signal generator

1974-05-28

1976-03-23

Claffy, Kathleen H.

179 90K, H04M 1902

Patent

active

039461645

ABSTRACT:
A circuit for generating precise tone signals for use in telecommunications systems, such as dial tone, busy tone, ringback tone, etc. the circuit provides tone signals at a level suitable for application for distribution throughout a telephone central office. A facility for providing interrupt of the signals at either a 60 or 120 IPM rate is included.

REFERENCES:
patent: 3581020 (1971-05-01), Ribner
patent: 3719897 (1973-03-01), Tarr
patent: 3778557 (1973-12-01), Frederiksen
patent: 3787836 (1974-01-01), Hagelbarger
patent: 3829783 (1974-08-01), Groenendaal et al.

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