Subscriber telephone set with amplified loudspeaker reception with reduction of gain in the case of an insufficient power supply

摘要

The invention relates to a subscriber telephone set with amplified reception loudspeaker. To avoid distortion of the signals transmitted to this loudspeaker should the power supply of the line be insufficient, it is provided for the amplifier feeding this loudspeaker to have its gain controlled by a signal resulting from the measurement of current passing through a shunt regulator serving for supplying the amplifier.