Elevator car modem with transhybrid rejection

Details Elevator car modem with transhybrid rejection Elevator car modem with transhybrid rejection

1995-08-25

1998-06-23

Kuntz, Curtis

Telephonic communications

Telephone line or system combined with diverse electrical...

Having transmission of a digital message signal over a...

379406, 379410, 375222, H04M 1100

Patent

active

057712778

ABSTRACT:
A telephone transmit circuit is connected through a resistor to a junction at which a telephone line interface circuit is connected, a transhybrid cancellation circuit is connected to the transmit circuit and includes a high frequency shunt matching network having capacitive and inductive components and a low frequency matching circuit which comprises a lead lag network having capacitive components, the output of the transhybrid circuit being connected to a summing junction at the input of a telephone receiver. The other input of the summing network is connected between the resistor and the interface circuit, whereby a portion of the transmit signal is fed back out of phase to the receive amplifier so as to cancel out undesirable side tones, across a predetermined frequency range.

REFERENCES:
patent: 4331842 (1982-05-01), Kiko
patent: 5271060 (1993-12-01), Moran, III et al.
patent: 5504778 (1996-04-01), Carriere

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