Microsoft KB Archive/110881

= Poor Sound Quality Using TrueSpeech Compression =

Article ID: 110881

Article Last Modified on 6/13/2001

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APPLIES TO


 * Microsoft Windows Sound System 2.0

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This article was previously published under Q110881



SUMMARY
When playing a file compressed using the Windows Sound System TrueSpeech compression scheme with the Turtle Beach MultiSound audio card, you may hear popping or scratchy noises. This is due to a limitation of the audio card and its Windows driver.



MORE INFORMATION
There are currently two versions of the MultiSound Windows driver: 1.0 and 2.0. Version 1.0 of this driver supports sampling frequencies of 11.025 kHz, 22.050 kHz, and 44.100 kHz. The TrueSpeech compression scheme, however, uses an 8.00 kHz sample that the driver does not support.

The range of sample frequencies in MultiSound Windows driver version 2.0 is increased through a process known as frequency dithering. This allows the MultiSound's built-in Digital Signal Processor (DSP) to contour the frequencies into a more usable range by filling in the gaps. However, the process is not compatible with the TrueSpeech compression method.

For further information about the Turtle Beach MultiSound audio card or the availability of Windows drivers, contact Turtle Beach.

The MultiSound audio card and its Windows drivers are manufactured by a vendor independent of Microsoft; we make no warranty, implied or otherwise, regarding these products' performance or reliability.

Additional query words: 2.00 multi sound monterey play back record digital samples sampled

Keywords: KB110881

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