miniDSP kits, our answers to your technical questions

[OllBoll]

Originally Posted by IMSTOOPID

DUH FULL VOLUME.. WE ARE TALKING AT LESS THAN FULL OUTPUT LEVELS
I CAN INPUT 24/96 BUT IS YOU ARE PROCESSING 32 BIT YOU HAVE 8 MORE BITS TO USE

: doing it 1st thing in teh DSP makes no sense at all
scaling juts before I2S out is the logical thing to do

if not, you might lose dynamic ramge within the DSP, as you have to do all kinds of up.down scaling for filters etc

No, the limiting factor for digital attenuation is that the DAC itself can handle 24 bit resolution. If you want to attenuate this signal then you send in a smaller signal with less bits.

Using 32 bit float or integers with more bits as the MiniDSP does when doing actual DSP calculations does not magically turn a 24 bit DAC into a DAC 32 bit.

[curryman]

No need to get loud

By the way: analog volume control does affect S/N ratio!

If you don't like digital attenuation for whatever reason look for a multichannel analog volume control (don't forget to check if they don't suffer from interchannel difference ). There are many available here or at ebay, either relay or PGA based.

[IMSTOOPID]

PROPERLY DESIGN ANALOG does not affect the s/n ratio for its full sweep range.
its constant.. if done right. s/n ration 112 db 0v out 2.8 v out 112 db!!!
with varing voltage inputs from 0- 2 v Input/
where digital attenuation , done incorrectly can cause sever loss of s/n ratio thru the attenuation sections..
then again done properly it will not..

all stand by whai i osted earlier and back by a 20 yr digital designer..

I just want to know how the dsp handles the volume before I plunk down 500
not knocik the unit but it is a diving factor to replace my dcx..

[IMSTOOPID]

ok 24 bit in 32 bit processing( or 28?) add (8) 0's to the end of chain oops digital level went up..good!!
do processing
process to 24 bit or turncate out to 24 bit?? which is it?
if you use the digital volume control it should be in the cpu after the processing
that way you dont lose bits and maintain s/n ratio. before you cut to 24 bits

[OllBoll]

An excellent way to get that information is to read their own spec sheets, which you obviously haven't. It's almost all in there though.

"Algorithm resolution: Double precision filters (56bits resolution)"

[katarakt]

Are there some future plans to produce a 2x4 miniDSP with better DSP? For subwoofer configuration the delay time is far too little.

[IMSTOOPID]

Thats FOR THE PLUG IN ollboll
not the hardware and that shows the volume control done in the analog domain
along with phase and delay.. dont think so.. and it only shows digital fader gain control
where and how is it processed real simple question. pre cpu post cpu or duing in cpu pre processing or cpu post processing..
since i cant find pic of 4x10 board and chip list now way to know from what is provided.. much less nay good AP measurements..

i don't see why people r so pissy because im asking simple questions that don't seem to get an answer or conflicting info on!

like i said $500 is alot to lay down without this kind of specific answers

and i have read the spec sheets and they are conflicting or incomplete
i wont post the vague answer from my email they sent id didnt answer my question either.,

[OllBoll]

Originally Posted by IMSTOOPID

Thats FOR THE PLUG IN ollboll
not the hardware and that shows the volume control done in the analog domain
along with phase and delay.. dont think so.. and it only shows digital fader gain control
where and how is it processed real simple question. pre cpu post cpu or duing in cpu pre processing or cpu post processing..
since i cant find pic of 4x10 board and chip list now way to know from what is provided.. much less nay good AP measurements..

i don't see why people r so pissy because im asking simple questions that don't seem to get an answer or conflicting info on!

like i said is alot to lay down without this kind of specific answers

That's probably because the volume control isn't done in the analogue domain but rather in the digital domain.

I think the problem is that you are asking questions that don't make sense, like for example talking about a CPU where none exists on the board or is needed.

[IMSTOOPID]

dang dude the flow sheet for the 4x10 show's a cpu or processor..
ok then why does their flow chart show... analog volume control!!!!!
something has to do the processing from the plugin loaded by your computer.. a dac doesnt do it!

[OllBoll]

Originally Posted by IMSTOOPID

dang dude the flow sheet for the 4x10 show's a cpu processor..
ok then why does their flow chart show... analog volume control!!!!!

You can use an analogue pot to control the volume level, but the volume changes themselves are all digital as they should be.

I haven't yet seen anyone else refer the DSP chips as CPUs, the most common use of CPU is rather the general purpose ones you find in modern computers. You confused me there since I assumed you meant a normal CPU.