"CAFxX" <cafxx@n-side.it> wrote in message news:<bu4fj3$6dj$1@lacerta.tiscalinet.it>...
> first of all thank you for your replies.
> as ian pointed out i just wanted to build a sort of multi-effect processor
> for mono audio signals.
> the adc and dac actually do have a 24/96 resolution (even 24/192 fot the
> adc) but they also support 24/48 and 24/44.1 so i wouldn't mind that. the
> problem simply was how to connect them (they all are serial, but they do
> have the data pin, the data clock pin and the l/r clock pin (since they all
> are stereo)).

Yep, they're all stereo.  (Or they have multiple pairs!)

Why don't use choose a DSP that has built-in I2S ports?  In that case,
you might actually be able to do something interesting.

Another option is to use a simple CPLD that takes I2S in and gives you
parallel out, and parallel in to I2S out.  If you're clever, you can
figure out how to extract only one of the channels, and if you're even
more clever, you'll realize that you can grab the 24-bit data in 8-bit
chunks, so you don't need 48 bits of shift register.  If you do it
this way, you're also not wasting your micro's time bit-banging a
couple of I/O ports.

I still think a DSP is the right way to go.

--a

first of all thank you for your replies.
as ian pointed out i just wanted to build a sort of multi-effect processor
for mono audio signals.
the adc and dac actually do have a 24/96 resolution (even 24/192 fot the
adc) but they also support 24/48 and 24/44.1 so i wouldn't mind that. the
problem simply was how to connect them (they all are serial, but they do
have the data pin, the data clock pin and the l/r clock pin (since they all
are stereo)).
i took a look at analog device's microconverters but their DACs only works
at 12bits. otherwise they would have been perfect. maybe there are other
solutions around but i didn't find them. if someone knows them...

thank you very much, CAFxX.

"Ian Bell" <ian@ruffrecordsDOTworldonline.co.uk> ha scritto nel messaggio
news:3fe7f72a_3@mk-nntp-1.news.uk.worldonline.com...
> Mike Turco wrote:
>
> >
> > "Frank Bemelman" <fbemelx@euronet.invalid.nl> wrote in message
> > news:3fe79bef$0$195$1b62eedf@news.wanadoo.nl...
> >> "Jim Stewart" <jstewart@jkmicro.com> schreef in bericht
> >> news:g6adnccAfOyJDXqiRVn-sQ@omsoft.com...
> >> > Frank Bemelman wrote:
> >> >
> >> > > Audio CD's are 16 bits at 44.1KHz, but 24 bit @ 96KHz doesn't
> >> > > sound unreasonable to me, for professional gear used in studios.
> >> >
> >> > Except that 24 bits is a s/n ratio of 144db.
> >> > I wouldn't be able to make a piece of wire
> >> > have a s/n ratio of 144db (:
> >>
> >> Me neither ;)
> >
> > Perhaps this is a product for people with very discerning ears ,~)
> >
> > The poster did ask for suggestions.
> >
> > Microchip makes a line of ADC's, and a simple DAC is just a bunch of
> > resistors. If the OP would be more specific about what it is he is
trying
> > to accomplish, that would lead to better suggestions.
> >
>
> I thought he was quite specific. He wants a single channel of audio in,
> apply effects to it in the digital domain and send the result to a DAC to
> recreate analogue audio. The 24bit/96KHz bit only came about because I
took
> the trouble to look up the chip he said he was looking at using.
>
> Ian
>

> > I meant specific in terms of quality. I used to work in the toy industry
> > and "quality" often meant "barely intelligible".
> 
> Me too and it still is.

That's why they print the word bubbles on the packaging. Many toys, I
can't understand what the hell they are saying. If I see the word
bubbles, that gives my audio processing firmware a list of possibles
and with those in memory, I can always guess what phrase is actually
being spoken.

On Mon, 22 Dec 2003 18:37:01 +0100, CAFxX wrote:

> hi,
> i was wondering how to connect an adc and a dac to a 8025 (DS89C420). do i
> have to use the two UARTs or it's better to use the "raw" i/o pins? what i'm
> trying to do is a sort of audio filter: the signal is converted in digital,
> read by the 8052 (where the fx are applied), and sent to the dac.
> moreover i'm using BB's PCM1802 as the ADC and PCM1744 as the DAC. the
> problem is these are all stereo adcs and dacs. do anyone knows about
> audio-oriented mono adcs and dacs?
> thank you for your help, CAFxX.

	Use an Analog Devices ADuC816 instead, it has both the ADC and DAC
onboard.  Or some other processor that contains both and avoid having to
interface separate components.

Mike Turco wrote:

> 
> "Ian Bell" <ian@ruffrecordsDOTworldonline.co.uk> wrote in message
> news:3fe7f72a_3@mk-nntp-1.news.uk.worldonline.com...
>> Mike Turco wrote:
>>
>> >
>> > "Frank Bemelman" <fbemelx@euronet.invalid.nl> wrote in message
>> > news:3fe79bef$0$195$1b62eedf@news.wanadoo.nl...
>> >> "Jim Stewart" <jstewart@jkmicro.com> schreef in bericht
>> >> news:g6adnccAfOyJDXqiRVn-sQ@omsoft.com...
>> >> > Frank Bemelman wrote:
>> >> >
>> >> > > Audio CD's are 16 bits at 44.1KHz, but 24 bit @ 96KHz doesn't
>> >> > > sound unreasonable to me, for professional gear used in studios.
>> >> >
>> >> > Except that 24 bits is a s/n ratio of 144db.
>> >> > I wouldn't be able to make a piece of wire
>> >> > have a s/n ratio of 144db (:
>> >>
>> >> Me neither ;)
>> >
>> > Perhaps this is a product for people with very discerning ears ,~)
>> >
>> > The poster did ask for suggestions.
>> >
>> > Microchip makes a line of ADC's, and a simple DAC is just a bunch of
>> > resistors. If the OP would be more specific about what it is he is
> trying
>> > to accomplish, that would lead to better suggestions.
>> >
>>
>> I thought he was quite specific. He wants a single channel of audio in,
>> apply effects to it in the digital domain and send the result to a DAC to
>> recreate analogue audio. The 24bit/96KHz bit only came about because I
> took
>> the trouble to look up the chip he said he was looking at using.
> 
> I meant specific in terms of quality. I used to work in the toy industry
> and "quality" often meant "barely intelligible".

Me too and it still is.

Ian

"Ian Bell" <ian@ruffrecordsDOTworldonline.co.uk> wrote in message
news:3fe7f72a_3@mk-nntp-1.news.uk.worldonline.com...
> Mike Turco wrote:
>
> >
> > "Frank Bemelman" <fbemelx@euronet.invalid.nl> wrote in message
> > news:3fe79bef$0$195$1b62eedf@news.wanadoo.nl...
> >> "Jim Stewart" <jstewart@jkmicro.com> schreef in bericht
> >> news:g6adnccAfOyJDXqiRVn-sQ@omsoft.com...
> >> > Frank Bemelman wrote:
> >> >
> >> > > Audio CD's are 16 bits at 44.1KHz, but 24 bit @ 96KHz doesn't
> >> > > sound unreasonable to me, for professional gear used in studios.
> >> >
> >> > Except that 24 bits is a s/n ratio of 144db.
> >> > I wouldn't be able to make a piece of wire
> >> > have a s/n ratio of 144db (:
> >>
> >> Me neither ;)
> >
> > Perhaps this is a product for people with very discerning ears ,~)
> >
> > The poster did ask for suggestions.
> >
> > Microchip makes a line of ADC's, and a simple DAC is just a bunch of
> > resistors. If the OP would be more specific about what it is he is
trying
> > to accomplish, that would lead to better suggestions.
> >
>
> I thought he was quite specific. He wants a single channel of audio in,
> apply effects to it in the digital domain and send the result to a DAC to
> recreate analogue audio. The 24bit/96KHz bit only came about because I
took
> the trouble to look up the chip he said he was looking at using.

I meant specific in terms of quality. I used to work in the toy industry and
"quality" often meant "barely intelligible".

Mike Turco wrote:

> 
> "Frank Bemelman" <fbemelx@euronet.invalid.nl> wrote in message
> news:3fe79bef$0$195$1b62eedf@news.wanadoo.nl...
>> "Jim Stewart" <jstewart@jkmicro.com> schreef in bericht
>> news:g6adnccAfOyJDXqiRVn-sQ@omsoft.com...
>> > Frank Bemelman wrote:
>> >
>> > > Audio CD's are 16 bits at 44.1KHz, but 24 bit @ 96KHz doesn't
>> > > sound unreasonable to me, for professional gear used in studios.
>> >
>> > Except that 24 bits is a s/n ratio of 144db.
>> > I wouldn't be able to make a piece of wire
>> > have a s/n ratio of 144db (:
>>
>> Me neither ;)
> 
> Perhaps this is a product for people with very discerning ears ,~)
> 
> The poster did ask for suggestions.
> 
> Microchip makes a line of ADC's, and a simple DAC is just a bunch of
> resistors. If the OP would be more specific about what it is he is trying
> to accomplish, that would lead to better suggestions.
> 

I thought he was quite specific. He wants a single channel of audio in,
apply effects to it in the digital domain and send the result to a DAC to
recreate analogue audio. The 24bit/96KHz bit only came about because I took
the trouble to look up the chip he said he was looking at using.

Ian

Frank Bemelman wrote:

> "Mike Turco" <miketurco@yahoo-nospam4me.com> schreef in bericht
> news:OzKFb.12539$7D3.12496@fed1read02...
>>
>> "Ian Bell" <ian@ruffrecordsDOTworldonline.co.uk> wrote
>>
>> > You need to check some basic maths first.  The PCM1802 I believe
> operates
>> at
>> > 96KHz sample frequency and 24 bits.
>>
>> Off the cuff, this sampling rate and resolution sounds like one hell of
>> an overkill for audio. Audio CD's are sampled at 16 bits, I think, and
>> not nearly at such a fast frequency. Also, processing and re-outputting
>> the audio through a ADC at 96K doesn't sound realistic, although it might
>> be with a super-fast 8052. What are the norms for audio recording and
>> processing, in regards to resolution and sampling freq? -- Mike
> 
> Audio CD's are 16 bits at 44.1KHz, but 24 bit @ 96KHz doesn't
> sound unreasonable to me, for professional gear used in studios.
> 
> SACD, super audio CD for the home user, is 1 bit at 2.8224MHz,
> yes MHz. That's even more information pumped through. I have
> no idea what mastering equipment for SACD uses.
> 

1bit @ 2.883MHz *is* 24bits @ 96KHz, that's what SACD uses.

> Anyway, I don't know what a fast 8052 can do here. Even if it
> is capable reading/updating the ADC/DAC, what can be done
> with the audio bits, in the time left...
> 

The 8051 the OP specified has a 30nS instruction cycle - it's the fastest
8051 around.

Ian

"Frank Bemelman" <fbemelx@euronet.invalid.nl> wrote in message
news:3fe79bef$0$195$1b62eedf@news.wanadoo.nl...
> "Jim Stewart" <jstewart@jkmicro.com> schreef in bericht
> news:g6adnccAfOyJDXqiRVn-sQ@omsoft.com...
> > Frank Bemelman wrote:
> >
> > > Audio CD's are 16 bits at 44.1KHz, but 24 bit @ 96KHz doesn't
> > > sound unreasonable to me, for professional gear used in studios.
> >
> > Except that 24 bits is a s/n ratio of 144db.
> > I wouldn't be able to make a piece of wire
> > have a s/n ratio of 144db (:
>
> Me neither ;)

Perhaps this is a product for people with very discerning ears ,~)

The poster did ask for suggestions.

Microchip makes a line of ADC's, and a simple DAC is just a bunch of
resistors. If the OP would be more specific about what it is he is trying to
accomplish, that would lead to better suggestions.

Mike

"Jim Stewart" <jstewart@jkmicro.com> schreef in bericht
news:g6adnccAfOyJDXqiRVn-sQ@omsoft.com...
> Frank Bemelman wrote:
>
> > Audio CD's are 16 bits at 44.1KHz, but 24 bit @ 96KHz doesn't
> > sound unreasonable to me, for professional gear used in studios.
>
> Except that 24 bits is a s/n ratio of 144db.
> I wouldn't be able to make a piece of wire
> have a s/n ratio of 144db (:

Me neither ;)

-- 
Thanks, Frank.
(remove 'x' and 'invalid' when replying by email)