Erik Hofman wrote:
James Richard Tyrer wrote:
Erik Hofman wrote:
Timothy Miller wrote:
On 4/3/06, Justin Findlay <[EMAIL PROTECTED]> wrote:
I'd say more than 24, perhaps 32 bits per channel.
Ok. I thought about saying 32, but I didn't want to look absurd. :)
32 bits is absurd. If it works, it would do an excellent job of
digitizing the noise of the input buffer amp.
The good part is that the noise would get mixed away though.
Internally you would have to use 32-bit floating point values,
Why? If you are going to have over 16 bits of output, 64 bit integer
math would be just as good and it would be faster. With 16 bit
output, 32 bit integer should be sufficient.
I hadn't thought of going 64-bit yet, but floating point values would
fix the subtle errors introduced by integer mixing.
With fixed point output, there really isn't any need to use floating
point for calculations. If you need more resolution, you just need more
fixed point bits. 64 bit would only be if we used regular CPUs. It is
clearly overkill. That is why 24/48 bit fixed point DSPs exist. 24 bit
output is overkill so 48 bits along with slightly wider accumulators
(intended to deal with temporary overflow with FIR filters) is quite
sufficient.
everything else will be obsolete rather soon. 24-bit D/A conversion
would be nice and 32-bit D/A converters would be great.
Note that 32 bit float is NOT 32 significant bits.
I know, but it would add the possibility to amply the result (digitally).
This works in theory but in practice the analog noise floor (at about
-100 to -120 dB even with very good amps) make this a bad idea. Analog
gain control with digital setting is better.
Or forget about an internal D/A converter all together and use
digital output only.
But where is the DAC? Would it have a good enough filter?
At best in the playback device, being it the TV-set, CD-player or
whatever. So it's up to the end user to determine the overall quality.
Yes, if you have good audio components with digital input then they
probably have good reconstruction filters, but not all audio components
have digital inputs.
--
JRT
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