A transcoder-codec circuit arrangement that supports voice-switched
hands-free radio operation. A first register is arranged to store a value
indicative of a peak signal in a receive signal path, a first attenuator
is coupled to the receive path, a second register is arranged to store a
value indicative of a peak signal in a transmit signal path, a second
attenuator is coupled to the transmit signal path, and a digital signal
processor is coupled to the first and second registers and configured and
arranged to update the value in the first register with a present peak
receive signal level if the value in the first register is less than the
present peak receive signal level. The digital signal processor is further
arranged to update the value in the second register to a present peak
transmit signal level if the value in the second register is less than the
present peak transmit signal level. A microcontroller is coupled to the
first and second registers and to the first and second attenuators and is
configured to read values from the first and second register and adjust
the first and second attenuators in response to the values.
