Digital Data Inversion And Adding Question.

mrfeedback · 24th May 2003, 02:23 PM

Old amplifiers provided pre-amp switching that allowed Stereo, Stereo Reverse, L+R Mono, L Mono and R Mono.
Anybody have any circuits handy to do this in the digital domain before the DAC stages ?.
Polarity inversion of the data immediately before the DAC is required too.

Eric.

Elso Kwak · 24th May 2003, 03:58 PM

Quote:

Originally posted by mrfeedback
Old amplifiers provided pre-amp switching that allowed Stereo, Stereo Reverse, L+R Mono, L Mono and R Mono.
Anybody have any circuits handy to do this in the digital domain before the DAC stages ?.
Polarity inversion of the data immediately before the DAC is required too.

Eric.

Hi Eric,
I will only answer the last question:
http://db.audioasylum.com/cgi/m.pl?f...ta&r=&session=
I you happen to use the PCM1704, data can be inverted by the voltage at pin 10 (high or low)

bigparsnip · 24th May 2003, 04:52 PM

I think what you would need here is a good bit of DSP as I doubt you will be able to find dedicated chips to do that sort fo thing, sen as how easy it is to do once the signal has been converted back to an analouge one. But, if anyone want to prove otherwise, I would be interesrted in finding out.

mrfeedback · 25th May 2003, 03:30 AM

Hi Elso,
Thanks for the info and links.
I'll study up and see what I can come up with.
My thoughts are towards a pcb that will to the Stereo/Reverse/Mono/Inversion switching and reclocking as an interface between reciever/decoder and output DACs.

Eric.

rfbrw · 26th May 2003, 07:57 PM

Quote:

Originally posted by mrfeedback
Hi Elso,
Thanks for the info and links.
I'll study up and see what I can come up with.
My thoughts are towards a pcb that will to the Stereo/Reverse/Mono/Inversion switching and reclocking as an interface between reciever/decoder and output DACs.

Eric.

Out of curiousity, do you have an actual use for such a board?

ray.

fdegrove · 26th May 2003, 09:27 PM

Hi,

Quote:

Out of curiousity, do you have an actual use for such a board?

Pro Audio use?

Cheers,

rfbrw · 26th May 2003, 11:06 PM

Quote:

Originally posted by fdegrove
Hi,

Pro Audio use?

Cheers,

I was talking to the engineer, not the oily rag.

fdegrove · 26th May 2003, 11:15 PM

Hi,

Quote:

I was talking to the engineer, not the oily rag.

Interesting response.

And saying I was only trying to save you the wait for a reply from the grandmaster himself...

Thank you for your politeness,

rfbrw · 26th May 2003, 11:48 PM

The grandmaster will either reply or he won't. Given the LESSEE at the head of your post, you were asking for it.

ray.

fdegrove · 27th May 2003, 01:25 AM

Hi,

Quote:

Given the LESSEE at the head of your post, you were asking for it.

There must be some connotation(s) that I must be missing...

Just goes to show how ignorant I can be when it comes to slang...obviously we don't all speak Chinese either.

Lessee wassup,

24th May 2003, 02:23 PM	#1
mrfeedback diyAudio Member Join Date: Feb 2002 Location: Perth, Australia.	Digital Data Inversion And Adding Question. Old amplifiers provided pre-amp switching that allowed Stereo, Stereo Reverse, L+R Mono, L Mono and R Mono. Anybody have any circuits handy to do this in the digital domain before the DAC stages ?. Polarity inversion of the data immediately before the DAC is required too. Eric. __________________ I believe not to believe in any fixed belief system.

25th May 2003, 03:30 AM	#4
mrfeedback diyAudio Member Join Date: Feb 2002 Location: Perth, Australia.	Hi Elso, Thanks for the info and links. I'll study up and see what I can come up with. My thoughts are towards a pcb that will to the Stereo/Reverse/Mono/Inversion switching and reclocking as an interface between reciever/decoder and output DACs. Eric. __________________ I believe not to believe in any fixed belief system.

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24th May 2003, 04:52 PM	#3
bigparsnip diyAudio Member Join Date: Apr 2003 Location: Cambridge	I think what you would need here is a good bit of DSP as I doubt you will be able to find dedicated chips to do that sort fo thing, sen as how easy it is to do once the signal has been converted back to an analouge one. But, if anyone want to prove otherwise, I would be interesrted in finding out.

26th May 2003, 11:48 PM	#9
rfbrw diyAudio Member Join Date: Oct 2001 Location: .	The grandmaster will either reply or he won't. Given the LESSEE at the head of your post, you were asking for it. ray.