A system for discriminating between a human voice signal and other sound signals

摘要

A system for discriminating between a human voice signal and other sound signals has a low-pass filter 3 with a cut-off frequency of 150 Hz and a voltage-controlled amplifier 4 connected between its input terminal 1 and output terminal 2. A low-pass filter 5 having a cut-off frequency of 60 Hz, a rectifier circuit 5 and an integrator circuit 7 are connected between the input terminal 1 and the control terminal 4a of amplifier 4. In use, the amplifier 4 suppresses signals originating from a human voice but passes other low frequency signals. The output terminal 2 may be connected to a body felt vibration generator.