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Re: Lo Fi Looping



Thanks Jon.  Yes, there seems to be quite a few versions offered by ISD.
Where did you purchase your chips?

> The big drawback as I see it is that there
> is no provision for overdub or feedback, but you could get this with a 
>two
> chip design if you were clever.

This proves that you're more clever than I--no clue here.  I'm more of an
advanced fiddler than designer.  Toss us a hint?

I'm certain there will be glitches at the loop point, and no overdub or
feedback or reverse play--exactly what everyone here detests.  Perfect!

Now if I can just find the time to try this durned thing...

David Lee Myers
http://www.pulsewidth.com


on 8/28/02 8:02 PM, Jon Wagner at jondrums@hotmail.com wrote:

> I've used the ISD chip before and indeed the bandwidth is low.  Its 
>designed
> for telephone answering machines I believe and the bandwidth is even 
>lower
> than a telephone, also I think 8KHz  is the max sample rate.  The chips I
> tried out are pretty cheap:
> 
> ISD1420PISD1420P Voice Record and Playback IC (20sec) $3.20
> ISD2560PISD2560P Voice Record and Playback IC (60sec) $9.95
> 
> If I remember right, they will store a large possible number of samples 
>even
> on power down, and they can store many samples with very negligable seek
> times.  There's a  loop playback option (don't know about glitches at the
> loop point though ;), or a loop "queueing" option that will play 
>consecutive
> samples.  A pin goes low when the sample is finished playing so with some
> simple logic it could be used to start from the beginning again for
> consecutive sample playing.  There is even an input that has a built in
> compressor and a mic pre, you can set the attack and release times with
> resistors (potentiometers if you want).  You can chain multiple chips for
> longer record/playback times too. The big drawback as I see it is that 
>there
> is no provision for overdub or feedback, but you could get this with a 
>two
> chip design if you were clever.
> 
> The lo-fi isn't really what I'm going for so I didn't really persue it 
>more,
> but the chip has the right features for a simple cheap looper!  I would 
>be
> happy to hear more about your project, even off-list if you want.  I'm
> betting you're going to want a simple micro on-board to do the control 
>tasks
> and user interface, but then again maybe not.  Good luck!
> 
> Jon
> 
> http://www.winbond-usa.com/products/isd_products/chipcorder/portfolio/
> http://www.winbond-usa.com/products/isd_products/chipcorder/datasheets/
>