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DIY & Tutorials
DIY For Audio
Forum DAC tweaking thread
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<blockquote data-quote="gbyleveldt" data-source="post: 19872" data-attributes="member: 122"><p>Not sure what you mean, to be honest. The PCM1794 automatically detects the sampling rate and bit depth based on what it is presented when set to I2S mode (as is the case with the GerDac). You can change this default by using the FMT0:1 pins if you want to force it into a certain mode (page 17 of the data sheet), but this is not used. For the above test, I disabled the SRC4192 by using its bypass pin. The SRC4192 then just passes through the I2S data that it receives.</p><p></p><p>As far as I can tell, the Digital Filter in the PCM1794 always oversamples x8. Not too sure about it though, I'll need to devise a little test to check that. It does irk me a little that the datasheet is so sparse with this fundamental information.</p><p></p><p>Anyway, we should get together at some point for a little listening test.</p><p></p><p>Cheers</p><p></p><p>Gert</p></blockquote><p></p>
[QUOTE="gbyleveldt, post: 19872, member: 122"] Not sure what you mean, to be honest. The PCM1794 automatically detects the sampling rate and bit depth based on what it is presented when set to I2S mode (as is the case with the GerDac). You can change this default by using the FMT0:1 pins if you want to force it into a certain mode (page 17 of the data sheet), but this is not used. For the above test, I disabled the SRC4192 by using its bypass pin. The SRC4192 then just passes through the I2S data that it receives. As far as I can tell, the Digital Filter in the PCM1794 always oversamples x8. Not too sure about it though, I'll need to devise a little test to check that. It does irk me a little that the datasheet is so sparse with this fundamental information. Anyway, we should get together at some point for a little listening test. Cheers Gert [/QUOTE]
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DIY & Tutorials
DIY For Audio
Forum DAC tweaking thread
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