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Hi Andy, I hop I am understanding your question.. The word width produced is 24 bits at any of the available sample rates. There are no effective 1bit PCM A/D converters (DSD is a different matter). So in a sense it is an "apple and oranges" situation, most over sampling converters use a 4 bit sigma-delta type converter but the resulting output is 24 bit resolution. In the case of the 96 I/O streams I run in my mix room, the converter chip is capable of around 123-126dB s/n rather than the theoretical 144dB that 24 bits could represent. This is due to purely Physical limitations, which dictate for example that you cannot design a useful gain stage with less than -129dB of noise. Sent from my iPad Nano On Dec 16, 2011, at 9:25 AM, andy butler <akbutler@tiscali.co.uk> wrote: > > Whose on first base? > > > I didn't mean that. > rather to question what the *numerical* bit depth of the 12.288Mhz > sampling would be. > > I was prompted to doing that by looking up "how does an oversampling ADC > work?" > and reading that the sampling was at 1bit. > > > Now, I'm easily convinced that sampling at 16bit 12.288Mhz > and digital filtering to 44kHz would rid of aliasing very easily, > ....but not so convinced (yet) knowing about the 1 bit sampling. > > andy > > > > > Charles Zwicky wrote: >> Bit depth is independent of sample rate. The bit depth simply >> determines the number of discreet amplitude levels which can be >> quantified at each sample. The number is expressed as an exponent of 2 >> (because each bit is binary - a 1 or a 0). 16 bits = 2^16 = 16,535 >> amplitude values, 24 bits = 2^24 >> =16,777,216...! >> Sent from my iPad Nano >> On Dec 16, 2011, at 4:42 AM, andy butler <akbutler@tiscali.co.uk> wrote: >>> Charles Zwicky wrote: >>> >>>> 256 x 48khz = 128 x 96khz = 64 x 192khz = 12.288Mhz >>>> In other words, the input is sampled at rate of 12.288Mhz independent >>>> of the system sampling rate. >>>> For one thing, this means that aliasing is nonexistent even at a >>>> "44.1khz" sample rate. >>> >>> Interesting, >>> what's the bit depth at the 12.288Mhz rate? >>> >>> andy >>> >