Tone responsive disabling circuit

Details Tone responsive disabling circuit Tone responsive disabling circuit

1980-06-27

1982-10-05

Konick, Bernard

1791702, H04B 320

Patent

active

043529623

ABSTRACT:
A tone responsive disabling circuit for disabling prior to the transmission of data on a telephone transmission line a device which is connected to the line for improving voice transmission on the line. The disabling circuit operates in response to the transmission on the line of a tone signal whose frequency falls within a predetermined band width and which also has a predetermined amplitude and minimum duration. The disabling circuit processes the signal transmitted on the line to generate two control signals. One of the control signals is a function of the transmission line signal. The other is a function of the energy contained in the transmission line signal which lies in a predetermined frequency band which is not the tone frequency band. When the control signal which is a function of the transmission line signal is greater in amplitude than both a reference signal and the energy related control signal, a phase locked loop is enabled to capture the tone signal and disable the voice improving device.

REFERENCES:
patent: 3069501 (1962-12-01), Gilman et al.
patent: 3647993 (1972-03-01), Foulkes et al.
patent: 3935403 (1976-01-01), Penicaud et al.
patent: 4115668 (1978-09-01), Skrovanek et al.
patent: 4177361 (1979-12-01), Birck
patent: 4194092 (1980-03-01), Luder

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