racebit
100+ Head-Fier
- Joined
- Mar 7, 2016
- Posts
- 344
- Likes
- 188
Rob, as a signal resolution has two components, amplitude and time (sample rate), if doubling taps increases amplitude resolution by 1 bit, what is the relation between taps and sample frequency increase? Can the taps be used for increasing both amplitude resolution and time resolution (rate) as we wish and according to the actual programming code used? If so what criteria do you use or think is best to choose between more amplitude resolution vs time resolution?The accuracy of reconstruction depends upon the input signal; so if we put a regular sine wave into an M scaler, then it will reconstruct the output to many times better than 24 bits; the problem starts when your input signal changes from a steady state signal (like a sine wave) to a transient, and then the reconstruction accuracy fails. And accuracy of transient reconstruction is vital as it affects the way the brain processes sound to build up the auditory illusion. Now the problem we have is that different transients will have different errors with different filters; but we can say with certainty that a sinc filter will perfectly reconstruct a bandwidth limited signal; and we can also say the M scaler is the same as sinc to 16.7 bits; that means we will get better than 16.7 bit reconstruction under all circumstances - indeed with a 1 kHz sine wave we would be looking at 32 bit accuracy or so, way better than the analogue portions of the DAC of course.