5.1 speaker position

Submitted by David_Parker on Tue, 2008-07-22 22:56.

The Dolby 5.1 standard speaker placement has the centre speaker at 0 degrees, the Front Speakers at between 22 and 30 degrees and the rear ("surround") speakers at 90 to 110 degrees. Does your driver software assume a specific speaker location when outputting in Dolby 5.1 format? Thanks, David.

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Hi David, The 5.1 audio is

Submitted by Aaron on Wed, 2008-07-23 16:03.

Hi David,
The 5.1 audio is encoded as discrete channels, so the speaker positions are really up to you in placing the physical speakers. The Callisto doesn't assume any positions.

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speaker placement

Submitted by David_Parker on Wed, 2008-07-23 22:15.

Thanks Aaron. Thats interesting. I am writing an application using the Microsoft XNA framework that requires accurate sound localization. The experts in the XNA forums told me that the signal strength for each channel is calculated in sound card driver software. But it sounds like your software takes the channel signals from the Windows system after the signal strengths have already been calculated somewhere in the Windows system. Can you tell me which part of the Windows system you get your channel signals from? Is it from DirectX?

David.

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Hi David, Yes, most often

Submitted by Aaron on Thu, 2008-07-24 17:48.

Hi David,
Yes, most often the 5.1 audio channels will come from DirectSound. Unless you are using the "7.1 Speaker shifter" DSP processing in the control panel, these channels are not mixed together.

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thanks

Submitted by David_Parker on Thu, 2008-07-24 21:53.

Thanks Aaron. That is very helpful. I have not been able to find this information in the Microsoft docuemntation yet but I will ask again the XNA (DirectX) forums.

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