The invention relates to a voice transmission system having a multitude of speech stations for multi-channel transmission over one or several lines, said system having identical speech stations which are controlled by a digital control device, a microphone, a microphone amplifier, a lowpass filter designed as a switch capacitor filter, a switch modulator controlled by a second fixed square-wave mixed signal, a second bandpass filter designed as a conventional analog filter, and a third switch modulator which is controlled by a frequency-selectable third square-wave mixed signal.