Combination of a loudspeaking telephone set and a hand set for s

Details Combination of a loudspeaking telephone set and a hand set for s Combination of a loudspeaking telephone set and a hand set for s

1980-09-04

1983-08-02

Popek, Joseph A.

179 81B, H04M 160

Patent

active

043967990

ABSTRACT:
Loudspeaking telephone set having a hand set connected thereto for soft speaking. When the hand set is placed on the telephone set, the microphone and the loudspeaker being in the switched-on condition, there is a risk that oscillations or singing will occur due to acoustic feedback. In order to avoid this risk, the hand set is provided with an ultrasonic transmitting device and the telephone set is provided with an ultrasonic receiving device 13. The receiving device comprises means to determine the propagation time of the ultrasonic signals and means for affecting the gain of the loudspeaking channel of the telephone set in dependence on the propagation time.

REFERENCES:
patent: 3928723 (1975-12-01), Kai
J. P. Dahl et al., "RF Hook Switch", IBM Technical Disclosure Bulletin, vol. 24, No. 4, Sep. 1981, pp. 1891-1892.

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