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MSP432 Speech recognition in a noisy room

Patrick Verkennis
Expert 4290 points

Hello MSP team,

Do we have any information on speech recognition in (noisy) rooms. e.g.: howto pick up a voice somewhere in the room with one microphone and be able to recognize speech. Do we have implementation examples using AGC and or noise cancellation?

Thanks in advance, Patrick Verkennis

  • 0
    Guru 74080 points

    You may want to start with this.

  • 0 in reply to Dennis Eichmann
    TI__Expert 4290 points
    Thanks, I have had a look a this and this is a very good starting point.

    Again, which techniques can be used to have room coverage with a single fixed microphone. (things like AGC, noise cancellation)
  • 0 in reply to Patrick Verkennis
    TI__Prodigy 745 points

    Speech recognition in a noisy environment with a single microphone is indeed challenging. Performance is tied closely to the SNR of the speech signal. AGC does not do anything to change the SNR itself, so is of limited use. For noise cancellation to be effective, it must not cancel any of the speech signal, which is difficult to determine.

    There are two typical approaches taken in speech recognition. One is to measure the background audio signal, and compensate the speech recognition models assuming that the background signal statistics remain constant over the short duration of an utterance. The second method is to estimate the predicted clean speech features given the statistics of the noise and input the clean speech features to the recognizer. The speech recognizer implemented on the MSP432 uses the former approach.

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