Problem when playing wav files

Comments

• DISaltzman

  June 2018

  The pitch is likely due to the wrong sampling rate being selected in the backend. Go to "Backend Settings", and then under "Sampler" there should be a setting called "Sampling frequency". You want that number to match the sampling frequency of your recordings.
• fladd

  June 2018

  It indeed sounds like a mismatch in sampling rate between your sound file and the audio system. However, there is no such thing as "Backend Settings" or "Sampler" in Expyriment.

  There are two ways to fix this:

  1. Change the sample rate of your audio files (by using an external programme)
  2. Change the audio system samplerate to the sample rate of your audio files, by setting expyriment.control.defaults.audiosystem_sample_rate=???.

  Hope this helps.

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• tdsholo

  July 2018

  Hello! Thank you so much for the responses. I checked the sampling rate of the files, and they are all 16k, so I set the sampling rate to expyriment.control.defaults.audiosystem_sample_rate=16000 before loading them, but the problem persists...any other ideas?
• tdsholo

  July 2018

  Sorry for the double posting, but it's solved now! I made the mistake of changing the sample rate after initializing the experiment haha. Thank you again!
• fladd

  July 2018 edited July 2018

  Hi,

  You will need to set expyriment.control.defaults.audiosystem_sample_rate=16000 before the audio system is started (which by default is right when an experiment is initialized). Hence, put that line right after you imported Expyriment.

  However, 16000 is a very uncommon (and very low) sampling rate I have to say (this means that the sound file does not include any frequencies above 8Khz). Are you sure that this is correct?

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