Control device for a hand-free alternate operating telephone...

Details Control device for a hand-free alternate operating telephone... Control device for a hand-free alternate operating telephone...

H - Electricity

04

M

379/81

H04M 1/60 (2006.01) H04M 9/08 (2006.01)

Patent

CA 2006190

A CONTROL DEVICE FOR A HAND-FREE ALTERNATE OPERATING TELEPHONE SET ABSTRACT OF THE DISCLOSURE A control device for a hand-free telephone set com- prises an emission channel including a microphone (M). a signal compressor (GE) and an attenuator (ATE). and a reception channel including a signal compressor (GR). an attenuator (ATR) and a loudspeaker (HP). the assembly of the emission and reception channels forming an ampli- fication loop, due to the acoustic coupling (AC) between the microphone and loudspeaker and to the electric coupling (AL) in the line interface. Moreover. means are provided for initially setting the gain of said loop to a determined value slightly lower than 1 (0 dB) and means for subsequently maintaining constant. in operation. the sum of the compressor and attenuator gains.

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