Re: Detecting a beep in a movie file audio track
Re: Detecting a beep in a movie file audio track
- Subject: Re: Detecting a beep in a movie file audio track
- From: tahome izwah <email@hidden>
- Date: Tue, 23 Nov 2010 09:49:48 +0100
If that beep consists of a single or multiple tones (such as a DTMF
signal) a full blown FFT is way to expensive, there are more
specialized algorithms for detecting this. Try a web search on
"Goertzel algorithm" it should give you some pointers.
--th
2010/11/23 Robert Bielik <email@hidden>:
>
> That sounds like DSP. I'm not very proficient in what type of components are
> available in CA, but you should be looking at FFTs. If you know what
> frequency the beep is, and its spectral content (i.e. if its a sinewave or
> other) you could measure the energy around the expected
> bins of the FFT and compare to the energy of the rest of the signal and
> discern if its the beep or not (given a specific level threshold). Also the
> beep probably has a duration, so you could test for that also to avoid false
> positives.
>
> Regards
> /Rob
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