Hands-free telephone apparatus

Details Hands-free telephone apparatus Hands-free telephone apparatus

1991-07-31

1993-10-19

Dwyer, James L.

Telephonic communications

Supervisory or control line signaling

Using line or loop condition detection

379390, H04M 160

Patent

active

052553167

ABSTRACT:
Digital-type hands-free telephone apparatus is provided including a microcontroller, an audio board and a COFIDEC circuit, in which the microcontroller permanently calculates the average values of 16 successive samples on each one of the send and receive channels and deduces therefrom which channel is to be enabled while attenuating the other using tables provided in ROM memory.

REFERENCES:
patent: 4488007 (1984-12-01), Chataignon et al.
patent: 4513177 (1985-04-01), Nishino et al.
patent: 4604501 (1986-08-01), Richmond et al.
patent: 4677661 (1987-06-01), Van Gilluwe et al.
patent: 4715062 (1987-12-01), Korsky et al.
patent: 4891837 (1990-01-01), Walker et al.
patent: 4982427 (1991-01-01), Nicolai
patent: 5075687 (1991-12-01), Chen et al.

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