Arrangement for the automatic control of the sound level of...

Details Arrangement for the automatic control of the sound level of... Arrangement for the automatic control of the sound level of...

H - Electricity

04

M

379/82

H04M 1/60 (2006.01) H03G 3/20 (2006.01) H03K 7/08 (2006.01)

Patent

CA 1171567

PHF. 80.520 17 ABSTRACT: An arrangement for automatically controlling the sound level of a telephone station comprises a control- lable attenuation circuit for the voice signal received, a pulse-duration modulator which produces pulses the dura- tion of which is modulated by the voice signal supplied by the controllable attenuation circuit, an overshoot detec- tion circuit which produces from the modulated pulses a compression pulse each time it is detected that the amplitude of the modulated voice signal reaches a certain threshold, the compression signal produced by the said overshoot detection circuit being applied to an integrat- ing circuit in the attenuating circuit which produces the attenuation control signal. The modulated signal being supplied to a loudspeaker amplifier.

373433

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