ad1847

hello,
are there some one who have worked with the AD1847 sound codec?

carsten wrote:
> hello,
> are there some one who have worked with the AD1847 sound codec?

Yep, I am sure that there are a few out here including me.  Whatcha
got?

Dan

"dan" <djmaguire@gmail.com> wrote in news:1145882620.666347.157510
@t31g2000cwb.googlegroups.com:

> 
> carsten wrote:
>> hello,
>> are there some one who have worked with the AD1847 sound codec?
> 
> Yep, I am sure that there are a few out here including me.  Whatcha
> got?
> 
> Dan
> 

Let me guess,

1. You have an old 2181 EZ Kit. 
2. You don't have enough instructions between samples even when you are not 
sampling at 48k.

Am I close?

-- 
Al Clark
Danville Signal Processing, Inc.
--------------------------------------------------------------------
Purveyors of Fine DSP Hardware and other Cool Stuff
Available at http://www.danvillesignal.com

Awwww Al...  It's no fun when we can't see you hold the envelope
containing the problem to your forehead! :-)

A big hello, BTW.  I've been away for quite a while.

BR,
Dan

Al Clark wrote:
> "dan" <djmaguire@gmail.com> wrote in news:1145882620.666347.157510
> @t31g2000cwb.googlegroups.com:
>
> >
> > carsten wrote:
> >> hello,
> >> are there some one who have worked with the AD1847 sound codec?
> >
> > Yep, I am sure that there are a few out here including me.  Whatcha
> > got?
> >
> > Dan
> >
>
> Let me guess,
>
> 1. You have an old 2181 EZ Kit.
> 2. You don't have enough instructions between samples even when you are not
> sampling at 48k.
>
> Am I close?
>
> --
> Al Clark
> Danville Signal Processing, Inc.
> --------------------------------------------------------------------
> Purveyors of Fine DSP Hardware and other Cool Stuff
> Available at http://www.danvillesignal.com

It has been a long time, but I recall that the 2181 has a DMA feature
(they call it autobuffering) where one can get interrupted when a
buffer of samples is ready. That is how I used it.

John

"dan" <djmaguire@gmail.com> wrote in news:1145889534.211550.323660
@j33g2000cwa.googlegroups.com:

> Awwww Al...  It's no fun when we can't see you hold the envelope
> containing the problem to your forehead! :-)
> 
> A big hello, BTW.  I've been away for quite a while.
> 
> BR,
> Dan
> 

I'm still waiting to see if I'm right. If I am right, the answer to his 
question is:

Process two samples at a time.

He should search comp.dsp from about 5 years ago and he will probably find 
a detailed answer. The AD1847 was been out of production for many years 
now.

-- 
Al Clark
Danville Signal Processing, Inc.
--------------------------------------------------------------------
Purveyors of Fine DSP Hardware and other Cool Stuff
Available at http://www.danvillesignal.com

I am guessing that you are right about the problem.  The 1847 was on
the first Sharc EZKITs, so the platform may be different although the
issues the same.  The lack of phantom power for microphones was also a
common question, too.  But that darned alternating intersample delay at
sample rates less than 48KHz caused more than a few head-scratches.
That should have made the 3rd page of the datasheet instead of page 11
or something.

BR,
Dan

"dan" <djmaguire@gmail.com> wrote in news:1145898448.853823.249830
@i39g2000cwa.googlegroups.com:

> I am guessing that you are right about the problem.  The 1847 was on
> the first Sharc EZKITs, so the platform may be different although the
> issues the same.  The lack of phantom power for microphones was also a
> common question, too.  But that darned alternating intersample delay at
> sample rates less than 48KHz caused more than a few head-scratches.
> That should have made the 3rd page of the datasheet instead of page 11
> or something.
> 
> BR,
> Dan
> 
> 

I think everyone got caught with this problem at one time or another. As I 
recall, the 2181 EZ Kit used 48k sampling for its examples and never 
mentioned it at all.

I can't say, I miss the AD1847.

-- 
Al Clark
Danville Signal Processing, Inc.
--------------------------------------------------------------------
Purveyors of Fine DSP Hardware and other Cool Stuff
Available at http://www.danvillesignal.com