Hello again,


> I wouldn't have though it would be very hard to modify it.
> 
It may not if you have the source and knows the AVR language !

>   Or you could use a counter on the lower order bits and control
> the high order bits of the EPROM directly from the PIC and divide the
> EPROM
> into several equal sized partitions.
> 
May be its is the simpler solution or a more simpler one : only counters to
the EPROM address and choice of the messages number by MSB address nbr (no
need for a PIC). The drawback : every message have a fixed size but could be
smaller if one detect an EOF byte ($FF ?) at the output of the EPROM that
will reset the counter ...

        By the way, do you think a sound from a simple R2R ladder will be
clear enough for my end purpose that are: messages (whistle, Tchoo-tchoos
...) for my railraod system ?

        Thanks again

        Jean-Yves

> Regards
> 
> Mike Rigby-Jones
> 
> > -----Original Message-----
> > From: Seyler Jean-Yves [SMTP:Jean-Yves.Seyler@CNES.FR]
> > Sent: Friday, May 28, 1999 8:53 AM
> > To:   PICLIST@MITVMA.MIT.EDU
> > Subject:      Re: Standalone WAV Player ?
> > 
> >                 Thanks Michael,
> > 
> >         I have the paper but this project have a drawback : it can only
> > play
> > one (big) message and I'd like to be able to play several ones !!!
> > 
> > Thanks for any other idea :-)
> > 
> > Jean-Yves
> > 
> > > ----------
> > > De :  Michael Rigby-Jones[SMTP:mrjones@nortelnetworks.com]
> > > RŽpondre ˆ :      pic microcontroller discussion list
> > > Date :        vendredi 28 mai 1999 09:25
> > > A :   PICLIST@mitvma.mit.edu
> > > Objet :       Re: Standalone WAV Player ?
> > > 
> > > There was a project to do exactly this in a fairly recent edition of
> > > Elector.  It used IIRC an AVR and an Atmel flash memory.  I have it at
> > > home
> > > somewhere, if no-one else knows I'll email which issue it was
> tommorow.
> > > 
> > > Regards
> > > 
> > > Mike Rigby-Jones
> > > 
> > > > -----Original Message-----
> > > > From: Seyler Jean-Yves [SMTP:Jean-Yves.Seyler@CNES.FR]
> > > > Sent: Friday, May 28, 1999 8:11 AM
> > > > To:   PICLIST@MITVMA.MIT.EDU
> > > > Subject:      Standalone WAV Player ?
> > > >
> > > >                 hello all big PICers,
> > > >
> > > > My apologizes if this sounds too much [OT] ...
> > > >
> > > >         Does any of you has big ideas about a stand alone ".WAV
> files"
> > > > player ?
> > > >
> > > > I thought of a pic scrolling through addresses of a (big !) EPROM,
> the
> > > > outputs feeding a DAC (single resistors ?) followed by a filter and
> a
> > > > "power" amp.
> > > > The other PIC's inputs will allow me to choose between several
> > messages
> > > > ...
> > > >
> > > > But, maybe, the audio quality would be rather nasty and I'd better
> > > switch
> > > > to
> > > > an "ISD design" with sounds recorded directly from the audio output
> of
> > > my
> > > > PC
> > > > ?
> > > >
> > > > Any comments will be welcome :-))
> > > >
> > > > Jean-Yves
> > > 
>