A wireless microphone having a split-band audio frequency companding system is
disclosed. The companding system includes a compression circuit in which one amplification
element is utilized in connection with a number of frequency bands. Each frequency
band has a rectifier and filter element associated therewith. High-pass filter
elements are utilized in the higher frequency bands of the compression and expander
circuits to reduce the transfer of low-frequency signals to the rectifier elements
that process the low-frequency signals, thereby reducing undesirable modulations
of a variable resistance element associated therewith.
