Sound Output Configure VI

LabVIEW 2018 Help

Edition Date: March 2018
Part Number: 371361R-01
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Owning Palette: Sound Output VIs

Requires: Base Development System

Configures a sound output device to generate data. Use the Sound Output Write VI to write the data to the device.

(Windows) You must have DirectX 8.0 or later to use this VI. (Linux) You must have the Open Sound System (OSS) driver to use this VI.


number of samples/ch specifies the number of samples per channel in the buffer. Use a large number of samples for continuous operations. Use a smaller number of samples if you want to use less memory.
sample mode specifies whether you intend to write just once (Finite Samples) or continuously (Continuous Samples). In Finite Samples mode, call Sound Output Write only until you have written the number of samples specified in number of samples/ch. In Continuous Samples mode, you can call Sound Output Write repeatedly as needed.
device ID is the input or output device you access for a sound operation. In general, most users should select the default value of 0. The value ranges from 0 to n–1, where n is the number of input or output devices on the computer.
sound format sets the playing rate, the number of channels, and the bits per sample of the sound operation. The values for each of these controls is dependent on your sound card.
Note  Setting sample rate (S/s) and bits per sample high uses more of the computer memory when the VI runs. Also, not all operating systems and sound cards support all sound format options.
sample rate (S/s) sets the sampling rate for the sound operation. Common rates are 44,100 S/s, 22,050 S/s, and 11,025 S/s. The default is 22,050 S/s.
number of channels specifies the number of channels. This input can accept as many channels as the sound card supports. For most sound cards 1 is Mono and 2 is Stereo.
bits per sample specifies the quality of each sample in bits. Common resolutions are 16 bits and 8 bits. The default is 16 bits.
error in describes error conditions that occur before this node runs. This input provides standard error in functionality.
task ID returns an identification number associated with the configuration on the specified device. You can pass task ID to other sound operation VIs.
error out contains error information. This output provides standard error out functionality.


Refer to the following VIs for examples of using the Sound Output Configure VI:

  • Generate Sound VI: labview\examples\Graphics and Sound\Sound
  • Sound File to Sound Output VI: labview\examples\Graphics and Sound\Sound
  • Simultaneous Sound Input Output VI: labview\examples\Graphics and Sound\Sound


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