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I want to be able to switch the absolute phase of the output on the Buffalo II. Is it possible to do this in the digital domain and if so, how?
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Rank: Member
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Joined: 6/20/2010(UTC)
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Location: Germany
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In my DAC, Parasound DAC-1500, absolute phase is inverted using 74HC04AP.
This DAC has four PCM65 for balanced output. They did not use opamps for balanced output stages,
but built two complete D/A sections for balanced output, one being inverted with 74HC04AP in the digital domain.
For unbalanced output, only one section is used.
74HC04AP is between digital filter (SM5813) and the DAC.
I guess, data format was (Sony) DATA/Wordclock/bitclock.
Do not know, if (Philips) I2s can be treated this way.
But I guess you need a SPDIF Receiver for decoding the SPDIF Data stream before you can invert in the digital domain.
Maybe this helps as a start.
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All you need do is reverse the polarity of the analog output, you will then have inverted absolute phase.
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Rank: Member
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Joined: 7/27/2010(UTC)
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Location: Malaysia
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Thanks guys. I have seen the 74HC04AP trick before but the problem is that this chip is quite noisy. I guess I will just make the switch on the analogue outputs.
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