On Monday 29 November 2010 22:03:23 Mark Rages wrote: > Hi all, > > I've got an ubuntu 10.04 system and I am using the sound card built > into my motherboard. > > I would like to play some audio sampled at 96 kHz. But I don't appear > to have this enabled: > > markrages@markrages-desktop:~$ cat /proc/asound/card*/codec#0 | grep rates > rates [0x7f]: 8000 11025 16000 22050 32000 44100 48000 > rates [0x60]: 44100 48000 > rates [0x7f]: 8000 11025 16000 22050 32000 44100 48000 > > But the same file lists "Codec: Analog Devices AD1986A". I looked up > the datasheet, and the AD1986A is able to support 96 kHz sampling with > "Double rate audio". > > In audacity I generated a .wav file with a 24 kHz sine wave sampled at > 96 kHz. It produces a flat line on the oscilloscope when I play it > back in audacity or sox. This makes me suspect that it's getting > downsampled to 48 kHz somewhere along the way. (I also tried playing > it back in alsaplayer and the result was an ugly on the 'scope. I > didn't try listening.). > > I generated a 1 kHz wave which showed up loud and clear, so the audio > path is working. > > (Before you ask, I'm not trying to play music for dogs, I'm trying to > generate FM stereo pilot tone.) > > So, what do I need to do to get 96kHz playback working? You need a soundcard that does 96kHz. Intel hda is not suited for that. "High definition audio" is only suitable for dvd and still is spec'ed for a lot of hizz and noise... If its for a notebook your choice is somewhat limited compared to the choice for pci/pcie capable machines. But there are several devices for low and high prices out there that will do 96kHz and also 192kHz. Using a hda for this is just asking for trouble and disappointment (if it even works). Have fun, Arnold
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