Telecommunications – Transmitter and receiver at same station – Radiotelephone equipment detail
Patent
1996-02-20
1998-02-24
Urban, Edward F.
Telecommunications
Transmitter and receiver at same station
Radiotelephone equipment detail
455570, H04B 138, H04M 100
Patent
active
057220867
ABSTRACT:
A digital cordless telephone (10) includes a handset (12) and a base station (14). A voice activity detector (20) in the handset (12) determines whether speech or silence is being received by a microphone (13) in the handset (12). An active enable signal is transmitted to the base station (14) when silence is being transmitted. An adaptive comfort noise generator (30) in the base station (14) then provides a comfort noise to a destination telephone instead of the silence. The output level of the comfort noise is a function of an energy level of a linear data signal received by the base station (14) before the enable signal becomes active.
REFERENCES:
patent: 5327461 (1994-07-01), Kushige
patent: 5349701 (1994-09-01), Lobel
patent: 5381460 (1995-01-01), Ohashi et al.
patent: 5384807 (1995-01-01), Yatim et al.
Bonet Luis
Teitler Nicole D.
Armstrong Darnell R.
Hill Daniel D.
Motorola Inc.
Urban Edward F.
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