Multiple Sample Rates

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brconflict
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2016/03/26 13:36:46 (permalink)

Multiple Sample Rates

I've got a strange issues (for me) with multiple sampling rates. I've recorded a session where the sampling rates of the input differed from the Project's sampling rate. Not all tracks recorded this way. There was no Imported audio. For example, the project is 44.1Khz, but the A/D was set to 96khz. Recording all tracks was good, and the playback is good in Sonar. However, Export is a different matter. No matter what sampling rate I choose in the export, it results in a file that plays back very slow.

Sonar doesn't give me any indication as to which tracks are recorded at what sampling rates, or what sampling rates they are at now--or at least, I can't find where to look.
 
Any ideas how to fix this so that the Export plays the same as Sonar plays the mix?

Brian
 
Sonar Platinum, Steinberg Wavelab Pro 9, MOTU 24CoreIO w/ low-slew OP-AMP mods and BLA external clock, True P8, Audient ASP008, API 512c, Chandler Germ500, Summit 2ba-221, GAP Pre-73, Peluso 22251, Peluso 2247LE, Mackie HR824, Polk Audio SRS-SDA 2.3tl w/upgraded Soniccraft crossovers and Goertz cables, powered by Pass-X350. All wiring Star-Quad XLR or Monster Cable. Power by Monster Power Signature AVS2000 voltage stabilizer and Signature Pro Power 5100 PowerCenter on a 20A isolation shielded circuit.
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    Klaus
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    Re: Multiple Sample Rates 2016/03/26 15:57:50 (permalink)
    brconflict
     
    Sonar doesn't give me any indication as to which tracks are recorded at what sampling rates, or what sampling rates they are at now--or at least, I can't find where to look.


    I can't help you with your main issue but for checking the sample rate of clips in your project,
    you can use SONARs browser > Project Audio Folder > then select a file and look at the bottom of the browser window to see sample rate, bit depth, etc.
     
    HTH a bit,
    Klaus

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    #2
    slartabartfast
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    Re: Multiple Sample Rates 2016/03/26 17:42:52 (permalink)
    Header investigator will allow you to read and change the sample rate header in wave files. The files that are playing too slowly need to have their headers reset to match the rate at which the interface was recording them. All of the track/wave files that you export from Sonar will have the same sample rate in the header, since Sonar did not know that your interface was sending data collected at a different sample rate than the project rate. So you need to export the tracks as waves, find the ones that are screwed up, and change the sample rate header for those files to 96K. They should now play at normal pitch/speed in a wave player like Windows Media Player. Then re-import them into Sonar and they will be re-sampled to the project rate. Note that you do NOT want to re-sample the files with the erroneous headers themselves as R8Brain or a Sonar import will do until you have changed the header. Resampling will keep the speed/pitch the same and change the sample rate. You want to keep the data unchanged but tell programs that load the wave files to use the appropriate playback speed. 
     
    http://www.railjonrogut.com/HeaderInvestigator.htm
     
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    wst3
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    Re: Multiple Sample Rates 2016/03/26 19:27:34 (permalink)
    that is so much easier than editing in a hex editor - thanks much!

    -- Bill
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    brconflict
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    Re: Multiple Sample Rates 2016/03/27 12:21:38 (permalink)
    slartabartfast
    Header investigator will allow you to read and change the sample rate header in wave files. The files that are playing too slowly need to have their headers reset to match the rate at which the interface was recording them. All of the track/wave files that you export from Sonar will have the same sample rate in the header, since Sonar did not know that your interface was sending data collected at a different sample rate than the project rate. So you need to export the tracks as waves, find the ones that are screwed up, and change the sample rate header for those files to 96K. They should now play at normal pitch/speed in a wave player like Windows Media Player. Then re-import them into Sonar and they will be re-sampled to the project rate. Note that you do NOT want to re-sample the files with the erroneous headers themselves as R8Brain or a Sonar import will do until you have changed the header. Resampling will keep the speed/pitch the same and change the sample rate. You want to keep the data unchanged but tell programs that load the wave files to use the appropriate playback speed. 
     
    http://www.railjonrogut.com/HeaderInvestigator.htm
     


    Man, that's a great suggestion! Unfortunately, it could not open the .wav files I have. Error Code 11. :/


    Nevermind, I had the files open in Sonar - DOH!!
     

    Brian
     
    Sonar Platinum, Steinberg Wavelab Pro 9, MOTU 24CoreIO w/ low-slew OP-AMP mods and BLA external clock, True P8, Audient ASP008, API 512c, Chandler Germ500, Summit 2ba-221, GAP Pre-73, Peluso 22251, Peluso 2247LE, Mackie HR824, Polk Audio SRS-SDA 2.3tl w/upgraded Soniccraft crossovers and Goertz cables, powered by Pass-X350. All wiring Star-Quad XLR or Monster Cable. Power by Monster Power Signature AVS2000 voltage stabilizer and Signature Pro Power 5100 PowerCenter on a 20A isolation shielded circuit.
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