Computer Music: Musc 216
JSYD Tutorial 3
Setting the SAMPLE RATE

The sample rate of the patch is determined by a parameter in the Output operator. The only reason you would need to change the sample rate would be if you are using a frequency which is greater than half of the sample. See Nyquist Limit. For example, if the sample rate is set to 22050 samples per second (Hz) and you were using a frequency greater than 11025 Hz, then you would need to set the sample rate higher, sat to 44100 Hz. Otherwise you would create a kind of digital noise known as ALIASING.

To set the SAMPLE RATE of your patch:

Open the patch you created in Tutorial2.

• Select the Output operator.

• You should see these parameters:
  
  

      

  Note the value in the Rate field.

  The value in the Rate field sets the SAMPLE RATE of the sound. Standard SAMPLE RATES include:

  44100 Hz (standard CD sample rate)
  22050
  11025

It is not necessary to change the sample rate of your patch unless you are using a frequency that is greater than half the sample rate. See Nyquist Limit. Otherwise you create more data than is necessary to represent your sound. For example, at a sample rate of 22050 Hz, one minute of monophonic sound equates to approx 2.5 megabytes of memory or disk space. At 44100 Hz, one minute of monophonic sound equals 5 megabytes. A stereo sound would double the amount of memory or disk space.

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