Telephonic communications – Substation or terminal circuitry – Sidetone control or hybrid circuit
Reexamination Certificate
2005-08-23
2005-08-23
Harold, Jefferey F. (Department: 2644)
Telephonic communications
Substation or terminal circuitry
Sidetone control or hybrid circuit
C379S406010, C379S394000
Reexamination Certificate
active
06934383
ABSTRACT:
An apparatus for reducing echoes which are generated due to signals induced to a handset connector in a telephone, includes a round-type handset connector cord arranged into a round configuration having a certain arrangement of the speech transmitting and receiving lines, and a connecting unit provided in the body of the telephone and having a differential amplifier for applying signals received to a transmitting unit by differentially amplifying the signals. Alternatively, the apparatus for reducing echoes includes a flat-type handset connector cord having the lines arranged in a certain order, and a connecting unit for connecting the speech transmitting and receiving lines in certain manner. Alternatively, the apparatus for reducing echoes and noises includes a flat-type handset connector cord having the lines arranged in a certain order, and a connecting unit connecting to the speech-transmitting lines and the speech-receiving lines in a certain manner.
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Bushnell , Esq. Robert E.
Harold Jefferey F.
Samsung Electronics Co,. Ltd.
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