[wdmaudiodev] Re: MS Windows maximal supported sample rate by the OS

  • From: HpWWorks Support <support@xxxxxxxxxxxxx>
  • To: <wdmaudiodev@xxxxxxxxxxxxx>
  • Date: Tue, 31 May 2016 17:45:07 +0200


Does MS consider to increase to 768k while this sample rate is now supported by AKM ADC/DAC chips...

One solutiin would be to use 2x...8x speed as I do support on ASIO .. means up to 1.54MHz at 8x of 192kHz using channrl bundeling :D

Best Regards
Hp. Widmer


Am 31. Mai 2016 17:51:59 schrieb "Matthew van Eerde" <dmarc-noreply@xxxxxxxxxxxxx> (Redacted sender "Matthew.van.Eerde" for DMARC):

It means the Windows audio engine will definitely not work at any sample rate below 10 Hz or above 384 kHz.

From: Support HpW-Works.com<mailto:support@xxxxxxxxxxxxx>
Sent: Monday, May 30, 2016 7:15 AM
To: wdmaudiodev@xxxxxxxxxxxxx<mailto:wdmaudiodev@xxxxxxxxxxxxx>
Subject: [wdmaudiodev] Re: MS Windows maximal supported sample rate by the OS

Thank you Matthew!

Regarding this maximal value of AUDIO_MAX_FRAMERATE 384000.0 // Maximum frame rate for APOs")

This means, this value my raised to any value :D (below the supported number format)



From: wdmaudiodev-bounce@xxxxxxxxxxxxx [mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx] On Behalf Of Matthew van Eerde (Redacted sender "Matthew.van.Eerde" for DMARC)
Sent: Freitag, 27. Mai 2016 20:07
To: Tim Roberts <timr@xxxxxxxxx>; wdmaudiodev@xxxxxxxxxxxxx
Subject: [wdmaudiodev] Re: MS Windows maximal supported sample rate by the OS

audioenginebaseapo.idl in the SDK exposes these constants:

cpp_quote("// Min and max framerates for the engine")
cpp_quote("#define AUDIO_MIN_FRAMERATE 10.0 // Minimum frame rate for APOs")
cpp_quote("#define AUDIO_MAX_FRAMERATE 384000.0 // Maximum frame rate for APOs")

From: Tim Roberts<mailto:timr@xxxxxxxxx>
Sent: Friday, May 27, 2016 10:08 AM
To: wdmaudiodev@xxxxxxxxxxxxx<mailto:wdmaudiodev@xxxxxxxxxxxxx>
Subject: [wdmaudiodev] Re: MS Windows maximal supported sample rate by the OS

Support HpW-Works.com wrote:
Is there any known limitation on the audio sample rate (this means, lower than the given integer value)...

Or in other words 768kHz or any higher rates will be supported by the OS using Windows 7/8/10 & WDM & WASAPI & WASAPI Exclusive interface?

Why? That's not audio. That's radio. The AM radio band begins at 530kHz. The range of human hearing ends somewhere below 30kHz.

Or is there any other limitation by the underlying HW device architecture?

The HDAudio spec, which is dominant today, is limited to 192kHz. Even that is overkill.


Tim Roberts, timr@xxxxxxxxx<mailto:timr@xxxxxxxxx>

Providenza & Boekelheide, Inc.

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