Hands-free telephone assembly

Details Hands-free telephone assembly Hands-free telephone assembly

1990-01-05

1992-11-17

Dwyer, James L.

Telephonic communications

Terminal accessory or auxiliary equipment

Including coupler

379430, 379447, 381 686, 381151, H04M 105

Patent

active

051649845

ABSTRACT:
A hands-free telephone assembly according to the present invention comprises a speech network mounted in a base and having an input channel and an output channel, the speech network being connected to a telephone interface which is selectively connectable to a telephone line. Also included are a gain-controllable amplifier in said input channel, a primary transducer including a primary speaker connected to the output of said gain-controllable amplifier, and a primary microphone, and a gain and frequency controllable amplifier connecting the primary microphone to said input channel. The primary transducer is mounted in a housing separate from the base, said housing being constructed and arranged so as to fit within the ear canal of a user and to be releasably maintained therein. Finally, the assembly contains a cancellation mechanism for suppressing positive feedback between the primary microphone and the primary speaker.

REFERENCES:
patent: 4025734 (1977-05-01), Aloupis
patent: 4588867 (1986-05-01), Konomi

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