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  • Users: JonnyMcK
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  1. JonnyMcK

    Inverse FFT question

    Hi, I am trying to shift the frequency spectrum of a signal by a fixed amount. A phase vocoder multiplies all frequencies by a fixed factor (for example, a factor of 2 moves 2Hz to 4Hz, 6Hz to 12Hz and so on) but I wish to move every frequency by a set amount (say, add 2Hz so that2Hz to 4Hz...
  2. JonnyMcK

    Instananeous frequency sampling

    Hi, I'm trying to sample the variation in frequency of an audio file using Matlab. Is it possible to break the audio file into a set number samples and construct an array containing the instantaneous frequency at each sample? Thanks!
  3. JonnyMcK

    ppm modulation - problems

    Hi everyone. I am using Matlab to modulate a wave file using pulse position modulation (ppm) and I'm having a few problems. When I try to use a low carrier frequency I get an error message saying Matlab is out of memory. (It works if the carrier frequency is, say 10000Hz, the wave file sample...
  4. JonnyMcK

    Sound clip modulation

    Hello everyone, I want to modulate a sample of audio with a square wave in Matlab. Any tips on how I could go about it? Thanks

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