|8625809||Switchable attenuation circuit for MEMS microphone systems|
A switch control circuit monitors a signal produced by a MEMS or other capacitor microphone. When a criterion is met, for example when the amplitude of the monitored signal exceeds a threshold or the monitored signal has been clipped or analysis of the monitored sig...
|4035585||Demodulator circuit in multiplex stereo and monophonic receiver|
An FM multiplex receiver comprises an averaging detection type demodulator circuitry. Two negative feedback paths lead from the L and R outputs of the switching circuit to the input of the amplifier, the output of which is connected to the input of the sw...