[sdiy] voice recorder

[mikko.a.helin at nokia.com]

Here's another voice recorder chip from Atmel:

http://www.atmel.com/atmel/acrobat/doc2469.pdf

There are also the Dream series chips that could be used for building
samplers/MIDI synths (SAM9773 would make a nice standalone MIDI synth, if
someone just designed the PCB for it ... TQFP80 package).

http://www.atmel.com/atmel/products/prod209.htm

SAM9753 includes everything needed to build a digital synth (except the
keyboard and LED) it even includes the keyboard scanner & LCD interface and
16ch ADC for controllers (or drum pads!). Synth engine use PCM & dynamic LP
filter and FM:

http://www.atmel.com/atmel/acrobat/doc1774.pdf


> -----Original Message-----
> From: ext ElmacacoX at aol.com [mailto:ElmacacoX at aol.com]
> Sent: 25. October 2001 1:26
> To: krooshof at xs4all.nl; synth-diy at dropmix.xs4all.nl
> Subject: Re: [sdiy] voice recorder
> 
> 
> while at radioshack today I saw the ISD1000A chip, some 
> marked $17, and 
> another marked $9.95, so I grabbed it, and it ended up being 
> only $5.38.
> 
> I just read the app notes and it seems pretty simple to 
> implament into a 20 
> second sample jammie module.  no need to even mess with the 
> address points 
> since in operation mode you can move the playback from sample 
> to sample (you 
> can sample more than once within the twenty seconds, although 
> you can only 
> loop the sample that begins at the beginning, unless you add external 
> circuitry).  you also can only loop if you don't overload the 
> memory, so less 
> than 20 seconds.
> 
> I guess for wavetable modules and whatnot based on this you'd 
> need extensive 
> logic on the address pins.  not really what i am going for.  
> 
> the only thing that seems tricky to me is matching up the 
> impedeances for use 
> with my synths and stuff, and also attenuating the input 
> signal or something 
> since it can only have 50mV at the analog input. and also 
> maybe someway to 
> mess with the internal sample clock, it has a clock input, 
> but the app notes 
> don't go into it.
> 
> This sounds like too much fun!
> 
> Ed
>