[
Date Prev][
Date Next] [
Thread Prev][
Thread Next]
[
Date Index][
Thread Index][
Author Index]
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/
>