From: email@example.com (mark hahn)
Subject: Re: Wanted - design/consultation for talking toy project
Date: 10 Jan 2003 17:11:47 -0800
References: <firstname.lastname@example.org> <email@example.com>
NNTP-Posting-Date: 11 Jan 2003 01:11:48 GMT
I enjoyed your "give the dog a chip" article, sorry i didn't credit
you, i couldn't find the issue.
I've looked at the pic and serial eeprom design. It looked like it'd
get pretty expensive ($ and size) if you wanted more than a few
seconds of sound. Unless ADPCM is a lot more efficient at compressing
sounds than i thought.
I haven't seen too many serial eeproms larger than 64k bytes. How
would you do a couple of minutes of sound without multiple eeproms?
firstname.lastname@example.org (Lewin A.R.W. Edwards) wrote in message news:<email@example.com>...
> > In large quanities (100,000 or more) you could look at the sound chips
> > used in kid's toys. These are pretty inexpensive, probably under $1,
> > but will cost a bit ($20,000?) to program. Embedded Systems
> > Programming magazine had a couple of articles on sound chip
> > programming in 2000 or 2001.
> I wrote the "Give the dog a chip" article you reference.
> These parts are available in quantities as small as 2.5k pieces (5k is
> a more usual number though), with prices starting at around a dime.
> But although you can place /one/ order that small, you need to have a
> relationship with an agent and a chip vendor that extends beyond a
> mere $500 one-time purchase.
> For anything short of major commercial production, ISD is a good
> choice. If this is unattractive for some reason, you can consider
> taking a cheap 8-pin microcontroller (PIC12Cxxx, Atmel Tiny8, etc etc)
> and marrying it to a speaker and a serial EEPROM. Implement your own
> ADPCM algorithm and you've got a lower-cost sound chip (probably $8
> for a couple of minutes, vs. $10-$15 for the comparable ISD part).
> I found the ISD parts generally quite difficult to work with, as they
> are application-specific; intended for answering machines and
> cellphone handsfree kits.