Patent
1975-03-20
1976-10-19
Cooper, William C.
179 81R, 179170NC, H04B 152, H04M 100
Patent
active
039872530
ABSTRACT:
A coupling circuit for a telecommunication system comprises a resistance bridge whose four arms consist each of two identical halves in series with each other, the resistive halves of one pair of opposite arms being of relatively high magnitude while the resistive halves of the other pair of opposite arms are of relatively low magnitude. A two-wire line is connected across a first bridge diagonal while a matching load impedance is connected across the other diagonal. A signal-transmitting circuit, including a microphone, is connected across the midpoints of the low-resistance arms whereas a signal-receiving circuit, including an earphone, is connected across the midpoints of the high-resistance arms.
REFERENCES:
patent: 3033940 (1962-05-01), Cox
patent: 3440367 (1969-04-01), Holtz
patent: 3748400 (1973-07-01), Ritz et al.
Cooper William C.
Dubno Herbert
Myers Randall P.
Ross Karl F.
Societa Italiana Telecomunicazioni SpA
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