Need info about modulation analysis

Miscellaneous Forums/General Discussion/Need info about modulation analysis

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I am searching for information about ways to automaticly analyze audiofiles for baudrate, modulation frequencies (eg 1200 and 2400 Hz for binary modulation) etc. It's for max 1200 baud, so no HF complications. I am able to load the audio into a bank, so basicly its a simple list of say 16 bit 44.1kHz samples. Any ideas or even sourcecode for spectrum analysis etc?