Performance specs?

Hmm, I'm not an expert, but don't most of your questions only apply to analog sound outputs?

Digital outs like S/PDIFs are bit-perfect per definition, unless the digital channel itself is very crappy (defect toslink cable etc), which I really don't is a big problem. Thus, any S/PDIF output will give you perfect PCM output, including the callisto.

Now, if you're talking about the analog headphone output, the situation is different. I wouldn't imagine that to be the best possible (I think the Nitrogen D2 has a 16-bit codec, for example).

yes I was referring to specs on the analog headphone output. Also, bitperfect is a reference to avoiding MS Windows Kmixer's tendancy to resample all window sounds. To bypass kmixer sondigo needs to have software driver support for their audio device to use kernal streaming or ASIO API's under windows XP.

We don't really market Callisto as an analog output device, although it does have that capability. Consequently, we don't have the exact analog specs, but if you're interested you can check out the Nitrogen D2 datasheet on cmedia.com.tw. This chip is at the heart of the Callisto, so it should give you an idea of what it's capable of.

how about the ASIO and KS and kmixer questions on the SPDIF output?

Hi,
No ASIO driver for Callisto, but the driver is WDM, which means it uses kernel streaming and pretty much no audio passes through kmixer.

Hope this helps,
Aaron

have you tested your driver with ASIO4ALL? That is a ASIO wrapper that uses Kernal streaming to provide ASIO API access for ASIO apps.

have you tested your driver with ASIO4ALL? That is a ASIO wrapper that uses Kernal streaming to provide ASIO API access for ASIO apps.

No, I haven't tried that. I'll try to take a look at it- thanks for the suggestion.

But doesn't all audio get resampled to 48kHz? This is likely what the OP means when he asks about bit-perfect output, i.e. 44.1 comes out as 44.1 etc.

It's true, all of the DSP code is performed at 48kHz, so 44.1kHz audio is resampled to that rate. The sample rate conversion is very good, however- not sure what the actual SNR of it is, but it's very high.

If the control panel mode is set to PCM would not your WDM audio under XP allow you to kernal stream bit perfect thru the calispo?

If the control panel mode is set to PCM would not your WDM audio under XP allow you to kernal stream bit perfect thru the calispo?

one test of all this bit perfect discussion is to play a DTS CD. This is DTS encoded material at 44.1K. If your external AV receiver sinces to the DTS signal you are getting past the kmixer.

That's right- if a DTS signal is passed to the driver, no sample rate conversion or extra DSP is applied. The signal is simply passed through the driver to the SPDIF output in its native format.

Can you pass 44.1Khz linear PCM 2 channel audio thru without resampling by the DSP? I see from your manual that you suppport 48khz digital audio. How is 44.1khz audio sent out the spdif?

44.1k audio is resampled to 48k, unless it is encoded in Dolby Digital or DTS formats (in which case it is passed through).