Electroacoustical telephone adapter

Details Electroacoustical telephone adapter Electroacoustical telephone adapter

1977-06-16

1978-09-19

Claffy, Kathleen H.

179 1MF, 179 2C, 179 2TC, H04M 908, H04M 121

Patent

active

041156595

ABSTRACT:
A telephone adapter for hands-free telephony, adapted for use with a telephone handset having structure including an earpiece, comprising: a transmit signal path comprising, in series, a microphone, amplification means, disabling means and a transducer; a receive signal path having means for amplifying sound energy from said earpiece, said receive path comprising, in series, a coupler, amplification means, disabling means and speaker means; bias means for maintaining said transmit path in an active state when no signals are present; and, means for interrupting said circuit paths in a complementary manner.

REFERENCES:
patent: 2580439 (1952-01-01), Kock
patent: 3189690 (1965-06-01), Millett
patent: 3189691 (1965-06-01), Simpson
patent: 3887771 (1975-06-01), Spanel
"The 4A Speakerphone-A Hands-Down Winner," G. Reichard et al., Bell Lab. Record (USA), vol. 51, No. 8, Sep. 1973, pp. 233-237.

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