Control circuit for hands-free telephone

Details Control circuit for hands-free telephone Control circuit for hands-free telephone

H - Electricity

04

M

379/81

H04M 3/42 (2006.01) H04M 1/60 (2006.01) H04M 1/62 (2006.01) H04M 3/40 (2006.01) H04M 9/10 (2006.01)

Patent

CA 1083735

ABSTRACT OF THE DISCLOSURE A hands free telephone comprises a receiving channel connected to receive signals from a telephone line, and a sending channel connected to apply signals from a microphone to the telephone line. The channels are functionally identical, each comprising a pre-amplifier or first amplifier, and a second or output amplifier. An attenuator is provided preceding each of the amplifiers. A control circuit includes a separate first delay circuit for receiving the output of the first amplifier of each channel to develop a control voltage for the first attenuator of the other channel, and a second delay circuit connected to receive the output of the first delay circuit for a respective channel, to develop a control voltage for the second attenuator of the respective channel.

285023

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