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Looper's Delight
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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/ >