Telecommunication receivers

Details Telecommunication receivers Telecommunication receivers

1982-05-03

1984-02-14

Rubinson, G. Z.

179 2A, 179 2DP, H04M 1100

Patent

active

044318723

ABSTRACT:
A DTMF telecommunication receiver in which an additional DTMF receiver circuit is provided tuned to a particular pair of tones. Detection of the particular tones opens a switch in the audio output line and eliminates crosstalk in the hybrid circuit making detection of further DTMF tones less likely to error.

REFERENCES:
patent: 4121053 (1978-10-01), Dick
patent: 4313038 (1982-01-01), Nilssen et al.
Callahan, Jr., "Integrated DTMF Receiver", IEEE Journal of Solid State Circuits, vol. SC14, No. 1, Feb. 1979, pp. 85-90.
Business Week, "Voice Mail Arrives in the Office", Jun. 9, 1980, pp.80-82.

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