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If you mean in hardware, please look at previous post:
http://www.picbasic.co.uk/forum/show...1&postcount=66
The chips include a logarithmic amplifier. So you take the output of this amplifier and feed it in the analog converter of the PIC. At the input you feed the analog signal either directly or through an active rectifier.
Ioannis
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Several times in this thread people have mentioned log amplifiers for audio signals.
See thatcorp.com THAT2252
http://thatcorp.com/datashts/2252data.pdf
The output is +0.3 to –0.3 volts over a 100db range. A simple op-amp will amplify the 0.6 volt signal and add an offset to get 0 to 5 volts.
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Nice chip, but I believe the other three (3089, 3189 and NE604) are more convienient since they work with single supply and are much wider in freq. range.
Ioannis
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