Nick, why don't you use an ISD device? Sure will have better audio quality.
Ioannis
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Nick, why don't you use an ISD device? Sure will have better audio quality.
Ioannis
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Hi Ioannis,
Have you used the ISD chips much? I have managed to write some code for the the isd4003 with SPI control about 18 months ago, but since then that type has been discontinued in the UK. I have got some of the 1700 series chipcorders and have been playing with them in push button mode. The problem I have with them is removing the pop and hiss that that is in the back ground when in play back, if I could remove or attenuate it they would be fine for my application. I found this last week when searching for ideas, it uses the audio out and parallel port for control.
www.fragtag.com.au/ISD_recorder.htm
Which makes them more appealing, like I said if I could remove the noise i'd be using them.
I have the circuit built as per the data sheet, with an lm386 audio amp connected to the speaker output. If you have any ideas they would be great.
regards Nick
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It was long time ago when I read the datasheets of the ISD products trying to decide which one to use. Finally the project did not mke it to production and I never used these chips, although I have some to experiment. I may do it sometime.
Why not process the file on a sound editor program on the PC, and then use the line out of the PC to record the clean sound to the ISD?
Ioannis
Last edited by Ioannis; - 16th December 2008 at 07:29.
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I wish I'd noticed this before doing my talking clock.
Or maybe not now that it's done in asm.
BTW EEPROM is good for storing sound.
I think a PicBasic version would be nice though, for projects where everything can
fit in one chip.
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For a version in basic see PIC iPod wav player
Norm
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Here is an update to my project. I brought the roman black board and it does work. I tried many band pass filters and the quality is terrible. The only way to even get decent quality was to have a speaker in an enclosure. That did more to filter out the noise, but it still wasn't great. I settled on a windbond device. I wouldn't waste time or money with this method.
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