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NBFM Decoder Should Support Unfiltered Audio Output #1568

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@DSheirer

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@DSheirer

The AudioModule by default uses a 300 Hz cutoff high-pass filter for audio from all decoders. This is intended to filter any DC offset and any sub-audible signalling in the LTR decoders. However, this prevents the end user from disabling the filter to analyze the demodulated audio.

Provide an option to enable/disable audio high-pass filtering for the NBFM and LTR-based protocols.

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