Multicore
Major Contributor
- Joined
- Dec 6, 2021
- Messages
- 3,421
- Likes
- 4,085
I was curious about a remark in @amirm 's video on the Bluesound Icon and posted it here but got no reply. So I restate it in its own thread and hope for your confirmation.
I understand the reconstruction filter to be fundamental in digital systems. Without it, or with very slow filter like Bluesound's, spurious (nonsense) signals will be present in the output of a DAC. So when Amir said "Is is audible, I can't tell you. Most likely probably not audible," I wondered, what are the conditions under which this will not be audible?
The spurious output signals will be above the Nyquist frequency which in the cases we're considering are ultrasonic, i.e. will have frequencies beyond human hearing. So it seemed to me that human hearing itself can provide the reconstruction filter so long as the system between the DAC and the hearing is linear in the ultrasonic range and not producing any nonlinear products in the audible frequency range.
Do I got that right?
We don't usually get detailed specs or measurements for the performance of equipment in the ultrasonic range. One can hope that it would be linear enough and maybe it usually is.
I understand the reconstruction filter to be fundamental in digital systems. Without it, or with very slow filter like Bluesound's, spurious (nonsense) signals will be present in the output of a DAC. So when Amir said "Is is audible, I can't tell you. Most likely probably not audible," I wondered, what are the conditions under which this will not be audible?
The spurious output signals will be above the Nyquist frequency which in the cases we're considering are ultrasonic, i.e. will have frequencies beyond human hearing. So it seemed to me that human hearing itself can provide the reconstruction filter so long as the system between the DAC and the hearing is linear in the ultrasonic range and not producing any nonlinear products in the audible frequency range.
Do I got that right?
We don't usually get detailed specs or measurements for the performance of equipment in the ultrasonic range. One can hope that it would be linear enough and maybe it usually is.