Ing. Daniel Rozsnyó wrote:
Well, 123 dB is just 20 bits, but they have a 24-bit one with 132 dB =
22 bits.. so why they do 32 bit ?
Daniel
I don't really know since 120 dB is considered to be the limit of analog
audio -- at least at room temperature.
Actually, there isn't a sharp cutoff at the noise level. Some of the
noise is probably 1/f noise so it only affects low frequencies. So, I
don't really know how much useful signal would exist below the 123 db
level. But to me it seems like overkill even though it is true that you
would probably be driving it with a 32 bit DSP chip.
--
James Tyrer
James Richard Tyrer wrote:
TI announcement:
http://focus.ti.com/docs/prod/folders/print/pcm1795.html?DCMP=hpa_audio_general&HQS=EVM+OT+pcm1795-em
I still wonder if there is any point to this, but it now exists for
32bit @ 192ks/s audio.
This would be nice for recording, but it will certainly be a challenge
for (analog) amplifier builders! Or perhaps for an analog front end for
a Class D power amplifier. I would think that power supply noise would
be a serious issue trying to get that much S/N -- a switcher is going to
need an analog regulator follower. Push pull Class D is said to have
better power supply rejection -- controversial subject. IAC, it is not
possible to directly drive a Class D amp with that much digital data; it
would be: 824.6 THz. I think that that is getting into far infrared.
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