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In Reply to: RE: WTF? posted by Ivan303 on July 02, 2015 at 13:44:27
What is meant by PCM 48/32? Do you mean 32 bit resolution and 48kHz sampling rate?? I don't think so.
Edits: 07/02/15Follow Ups:
"What is meant by PCM 48/32? Do you mean 32 bit resolution and 48kHz sampling rate?? I don't think so."Yes, the common interface formatinside computer systems today for PCM data is typically 32 bit (IEEE) floating point as it enables digital signal processing without overload and/or loss of resolution. The extra bits aren't doing much for you unless the computer is doing DSP, but then they aren't costing anything either because the computer data is processed more efficiently on word boundaries. Normally this is not stored in computer files to save space on disk, but it is common to store intermediate files created by audio editors and other post processing software in 32 bit floating point since this avoids the slight degradation from each conversion from 32 bit floating point back to 24 bit fixed point.
It is possible to hear changes to 24 bit audio files where only the low order 24th bits change. How signals at such a low level are perceived defeats my understanding, but they can be perceived, at least by some people.
Another format used by some software and some DACs is 32 bit integer. This is what I send from HQPlayer to my Mytek DAC when sending PCM. This is even higher resolution than 32 bit floating point if the signal levels are properly scaled, but this is less practical for software that does complex DSP. Also, most processors have been optimized for floating point arithmetic.
Tony Lauck
"Diversity is the law of nature; no two entities in this universe are uniform." - P.R. Sarkar
Edits: 07/02/15
48000.0 Hz 2 ch 32 bit integer (in english)
There's an app which identifies the actual software settings of any USB device, look up TDD v. 1.83.0 descriptor dump it will tell you what the input sampling capacity of the DAC is, but it presumably only tells you what the DAC designer wants you to know......
I did find out from this program (and from reviews) that my (built in 2010) DAC from Musical Fidelity is limited to 48kHz native on the USB input, the slightly later version was updated to 192kHz, but whether anyone in their right mind could identify these differences from a blind test remains to be determined....
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