Hi.
While reading the thread on the Philips CD723, I came across this..
It made me wonder, if data is "tampered " with in some cd players, is the SPDIF output always the same ?
Andy
While reading the thread on the Philips CD723, I came across this..
The other problem is the digital filter in the SAA7378 is mediocre at best. The internal resolution is not sufficient at all, stop-band attenuation is very poor, and a -0.5dB downscaling is applied on all input signals to prevent overflows. The chip doesn't even dither before this downscaling. Thus, you will never get accurate samples from the CD out the I2S of the chip!
It made me wonder, if data is "tampered " with in some cd players, is the SPDIF output always the same ?
Andy
No, the SPDIF is also corrupted: read here
http://peufeu.free.fr/audio/extremist_dac/bit_accuracy/
http://peufeu.free.fr/audio/extremist_dac/bit_accuracy/
Giaime said:No, the SPDIF is also corrupted: read here
http://peufeu.free.fr/audio/extremist_dac/bit_accuracy/
I was not refereing to te CD723 in particular but was asking the question in general.
So I guess one answer would be it depends on the chipset.
Andy
phofman said:The digital filter is the first stage of DA conversion. It would make sense to tap the SPDIF signal BEFORE the filter, otherwise the SPDIF stream would be the upsampled one, e.g. 352.8kHz
This is what happens in the SAA7220.
I assume therefore that, in this case, the SPDIF is "uncorrupted".
Andy
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