Tone elimination circuit

Details Tone elimination circuit Tone elimination circuit

1981-06-08

1983-03-22

Rubinson, G. Z.

1791702, 1791704, H04B 158, H04B 320

Patent

active

043777309

ABSTRACT:
A cancellation circuit which may be utilized in a subscriber loop interface circuit to allow a tone to be supplied in the receive path of the hybrid circuit to be received by the calling subscriber and for cancelling said tone from being transmitted to a called subscriber that is coupled via a carrier channel to the hybrid circuit. The cancellation circuit comprises circuitry responsive to the tone appearing on the transmit path for supplying in-phase and quadrature phase signals at the frequency of this tone to cancel the same to prohibit transmission thereof while simultaneously varying the output impedance of the hybrid circuit at the frequency of the applied tone.

REFERENCES:
patent: 3769466 (1973-10-01), Von Pfeil et al.
patent: 4004109 (1977-01-01), Boxall
patent: 4320498 (1982-03-01), Justice

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