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This example shows how to set up continuous audio generation using multiple audio channels. The signal, a sample of Handel's 'Hallelujah Chorus', is broken up into contiguous segments and played back in two parts. The first part of the example plays each segment on a single speaker and a sub-woofer. The second part plays each segment on a different set of speakers (a choir of voices).
Drivers Audio Output
Load Audio Data
Load Handel's 'Hallelujah'.
Load variables:
yrepresenting the Hallelujah waveformFsrepresenting the sampling frequency
- USB audio driver in USB Audio Player/Recorder PRO and Audio Evolution Mobile. Last update: Feb 5, 2021. EXtream Software Development has written a custom USB audio driver from scratch because Android did not support USB audio until Android 5.
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Create a Data Acquisition
Create a DataAcquisition object using directsound as the vendor ID.
Add Channels and Adjust Generation Scan Rate to Match the Audio Sampling Frequency
Add six audio output channels and set the generation scan rate to the audiosampling rate.
Plot Audio Data
Visually identify audio segments that correspond to each 'Hallelujah' in the chorus and select sample numbers at which these segments start and stop. Each color in the plot corresponds to a different segment of the chorus.
Identify the End of Each Segment
Visually identify the segment boundaries and mark them.
Define Speaker Parameters
Set up a selection of speakers in a cell array named speakerselection to play five segments of 'Hallelujah' on six different speakers.
Drivers Audio Data Software
Assign Speakers to Groups
Each speaker selection specifies which speakers from the 5.1 channel speaker system play each audio segment (these assignments may vary for your speaker system). For the first part of the example, use single speakers paired with the sub-woofer (4).
Speaker 1: Left-Front
Speaker 2: Right-Front
Speaker 3: Center
Speaker 4: Sub-Woofer
Speaker 5: Left-Rear
Speaker 6: Right-Rear
Drivers Audio Dell
Write Single Channel Outputs
Write a sequence of single channel outputs and then pause before proceeding to the next section.
Assign Speakers to Groups
Each speaker selection specifies which speakers from the 5.1 channel speaker system play each audio segment (these assignments may vary for your speaker system). For the second part of the example, use groups of speakers. Note that the sub-woofer (4) is included in all speaker selections
Drivers Audio Drivers
Speaker 1: Left-Front
Speaker 2: Right-Front
Speaker 3: Center
Speaker 4: Sub-Woofer
Speaker 5: Left-Rear
Speaker 6: Right-Rear
Write Multichannel Outputs