Tone responsible disabler circuit for an echo canceller

Details Tone responsible disabler circuit for an echo canceller Tone responsible disabler circuit for an echo canceller

1984-11-30

1987-04-14

Rubinson, Gene Z.

Telephonic communications

Echo cancellation or suppression

379410, H04B 320

Patent

active

046584200

ABSTRACT:
A tone disabler is designed for use in a full duplex data transmission system adapted to send a tone before each transmission of data and to reverse the phase of such tone during a later half of a full duplex data transmission. Both the tone and the phase reversal are detected. Responsive to a coincidence of such detections, a control signal is given to disable an echo canceller. The control signal is fed back to latch the control signal as long as the tone is present.

REFERENCES:
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patent: 3783194 (1974-01-01), Vilips et al.
patent: 3935403 (1976-01-01), Penicaud et al.
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patent: 4288664 (1981-09-01), Araseki
patent: 4352962 (1982-10-01), La Mothe
patent: 4469916 (1984-09-01), de Bergh et al.
The Post Office Electric Engineers' Journal vol. 63, Part 2/ Jul. 1970.

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