Shop OBEX P1 Docs P2 Docs Learn Events
Audio ADC Frequency Amplitude Trigger — Parallax Forums

Audio ADC Frequency Amplitude Trigger

TheVigTheVig Posts: 41
edited 2012-10-31 16:18 in Propeller 1
Looking at this thread I am very excited:
http://forums.parallax.com/showthread.php?96099-Propeller-Application-DEMO-Spectrum-Analyzer-(for-Audio)

Basically what I would like is to build a trigger that responds to audio where I can limit the bandwidth and then transmit the peak amplitude within that bandwidth

So basically what this demo is showing without all the complexity of the video.

Thanks.
Jim

Comments

  • Phil Pilgrim (PhiPi)Phil Pilgrim (PhiPi) Posts: 23,514
    edited 2012-10-31 15:11
    Also, take a look at the Goertzel algorithm, if you already know your center frequency and desired bandwidth:

    -Phil
  • TheVigTheVig Posts: 41
    edited 2012-10-31 16:18
    The Goertzel algorithm looks promising. I do know the center frequency.

    Could you also point me towards a few specifics as to connecting line level audio up to the propeller? (i.e. schematics)

    Does the Goertzel example calculate amplitude?

    How could the "Goertzel DTMF Demo" be modified to output to the Parallax Serial Terminal the detected frequency and the amplitude?

    Sorry for all the noob stuff, I'll get there I promise!!
Sign In or Register to comment.