Lpc2000

Most of them that I'm aware of have an AC97 interface. I haven't 
explored this on the LPC2xxx yet, but plan to. I have a funny feeling 
somewhwre that the LPc has this, but may eb wrong, it's a vague 
recollection of a response in this group a couple of weeks ago.

Al

brendanmurphy37 wrote:

> 
> 
> Yes, that is one way of describing the core of a sigma-delta codec.
> 
> I'd agree with Owen on his observation about using DSP algorithms to
> reduce hardware requirements. We take this to the extreme,
> inplementing a full-blown software modem on the LPC2000. We've had
> customers who have replaced older 8-bit systems with 32-bit RISCs
> like the LPC2000 and actually reducing the system BOM cost, as they
> no longer need a modem IC. My point is that as well as having a much
> better programming environment (full ANSI 'C' etc.), more memory etc.
> you have a lot more processing power than any 8-bit, so why not use
> it?
> 
> To get back on-topic: does anyone know of a good (i.e. cheap!) way to
> interface an audio codec to any of the LPC2000 range? We've managed
> to do it without additional hardware for some voice-band (i.e. 8KHz
> sampling) codecs with a few tricks, but not for something with higher
> sampling rates (such as 44KHz and beyond). They tend to have
> something like I2S on their digital side, which doesn;t sit to well
> with the available interfaces.
> 
> Regards
> Brendan
> 
> ******************************************************************
> Brendan Murphy, Chief Technical Officer (CTO)
> Innovada, invent, DCU, Dublin 9, Ireland
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> 
> 
> 
> --- In lpc2000@yahoogroups.com, Bruce Paterson <bruce@t...> wrote:
>  > Owen Mooney wrote:
>  >
>  > > Some of the early CD players worked on this principal. They had a
> high
>  > > freq 14 bit D/A. The advantage of this is the improved phase
> response of
>  > > the system. Jo public couldn't understand how a 14 bit D/A was
> giving 16
>  > > bit performance so I think they stopped doing it.
>  >
>  > No, I believe the idea transformed to the extreme with MASH 1 bit
>  > converters. Sample fast enough and you only need 1 bit (a single
> high
>  > speed comparator). Isn't this what sigma-delta codecs use ?
>  >
>  > --
>  > Cheers,
>  > Bruce
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