Patent ID: 6934383

Claim:
An apparatus for reducing echoes in a telephone, comprising: a round-type handset connector cord arranged into a round configuration and including Tx+ and Tx− speech-transmitting lines and Rx+ and Rx− speech-receiving lines for connecting a handset to a body of the telephone with the Tx+ and Tx− speech-transmitting lines being connected to a microphone of a handset and the Rx+ and Rx− speech-receiving lines being connected to a speaker of the handset, the Tx+ and Tx− speech-transmitting lines being opposed to each other, and each of the Rx+ and Rx− speech-receiving lines alternating with each of the Tx+ and Tx− speech-transmitting lines; and a connecting unit provided in the body of the telephone and including a differential amplifier applying signals received via the Tx+ and Tx− speech-transmitting lines to a transmitting unit by differentially amplifying the signals, the connecting unit connecting the Tx+ speech-transmitting line to a non-inversion input terminal of the differential amplifier, the Tx− speech-transmitting line to an inversion input terminal of the differential amplifier, the Rx+ speech-receiving line to a speech receiving unit, and the Rx− speech-receiving line to the ground.