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XXHighEnd > Ultimate Audio Playback > XXHighEnd Support > HDCD encoded file and arch prediction upsampling
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Author Topic: HDCD encoded file and arch prediction upsampling  (Read 6201 times)
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Suteetat
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« on: February 21, 2010, 04:45:28 pm »
Quick question, when playing HDCD encoded file at 16/44.1 or HRx 24/176 file, my Berkeley DAC HDCD light lit up as expected but when I play
16/44.1 file with 4x upsampling/AP, HDCD light does not light up. Is this something that is expected? I am using the current 09-6 version with 
peakxt selected. Same thing also happened with 09-5xx with 4x upsampling/AP as well.
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0.9z-4, KS-adaptive, buffer 256, Q1=1, no oversampling, SFS 100, straight contiguous,
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Robin Hood
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« Reply #1 on: February 21, 2010, 05:05:38 pm »
I thought the HDCD light on the Berkeley DAC was a convenient, though indirect, flag to show whether the digital playback was bit perfect or not.  Upsampling may or may not sound better, but it is not bit perfect.
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manisandher
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« Reply #2 on: February 21, 2010, 05:28:15 pm »
Exactly. Any form of upsampling will change the LSB and the HDCD light will not come on. So technically, you're ruining the HDCD decoding by applying AP.

BUT...

I've done extensive listening and in my system, QAP sounds better than 'HDCD'. My DAC has the old PDM100 filter/decoder chipset which I believe was the best filter available at that time... but no match for QAP! My understanding is that the filter in the BADA is better than the PDM100. Better than DAP? Maybe. Better than QAP? I doubt it...

Mani.
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Suteetat
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« Reply #3 on: February 22, 2010, 01:03:19 am »
I see, thanks for the clarification.  I am still on the fence regarding QAP. it sounds better with most recording while
I prefer no QAP some recordings.
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Intel i7 950 12GB DDR3 triple channel, Win7 64bit sp1 on SSD,
firewire -> Weiss INT202 -> Playback MPS-5-> ??

0.9z-4, KS-adaptive, buffer 256, Q1=1, no oversampling, SFS 100, straight contiguous,
minimum Clock Resolution, Scheme 2
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