H - Electricity – 04 – J
Patent
H - Electricity
04
J
363/10, 379/68
H04J 3/00 (2006.01) H04M 9/08 (2006.01) H04Q 11/04 (2006.01)
Patent
CA 1040327
ACTIVE HYBRID SIDETONE PRODUCING CIRCUITRY FOR SIDETONELESS TELEPHONE Abstract of the Disclosure A line circuit for a four-wire sidetoneless telephone is disclosed for use in a time division multiplex (TDM) communication system. The line circuit comprises circuitry for interfacing two-wire transmit and two-wire receive paths with transmit and receive operational amplifiers of a TDM active hybrid. Time division switches connect the amplifiers to respective transmit and receive TDM buses in time slots occurring in repetitive cycles and for exchanging communication signals on the buses. A sample/hold capacitor is arranged for storing a sample of a communication signal obtained from the receive bus via a time division switch. A resistor network couples an output signal from the transmit amplifier to an inverting input of the receive amplifier for cancelling a predetermined portion of the sampled signal applied to a noninverting input of the same amplifier from the sample/hold capacitor and for thereby providing a sidetone signal to the two-wire receive path.
221987
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