Hi friends, little help here. I need 2 design a circuit to play a prerecorded music continuously, the length of the recording is only 30sec. I tried APR9600 and connected it as per the datasheet, used it in auto rewind mode. It plays continuously but at the end of that 30sec recording, it gives a little silence, which it not at all desired.. Any other chip which can do this easily?? m trying to avoid any microcontroller here, but if it is must, i can consider it.!
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Supposedly the pic32's have a lot of audio features(such as decoding) and work well for sound. Would be easy to set something up to use if you have used them before. Just an option though.
ave
Hi, thanx, but I've used 8/16-bit controllers only, and besides, this circuit is required to be cost-effective and quick to build
How many of these do you need? Are you developing a new product, or just trying to solve a one-off type problem.
If the latter, Google search "Digital Audio Repeaters".
I do know that Eletech has a model that will do exactly what you want, right off the shelf, at fairly reasonable pricing. Recognizing that "reasonable" means different things to different folks.
Eletech also has a QuickVoice chip set available. Been a long time since I played with them.
Good luck.
You mean, first convert the voice into digital using an ADC than store it into EEPROM and while playing it keep sending EEPROM data to DAC?? that will ask for a huge EEPROM even for 30 sec (may be >1Mb, if i sample at 50k). Though i've nevr tried audio signals on ADC/DAC, i can try this one, but isn't there some simpler solution with inbuilt DAC
+memory+ADC???
The Eletech models look quite big! m thinking of a small PCB which can fit into a toy kind of thing. At the moment i need less than 10 to be fitted in a local store for playing continuously a theme music, which may be required to change later.. Thanks.
Are there any other requirements you are looking for that you did not mention in your first post ??
Any micro with a DAC output may work for you:
The APR9600 seems to be bandwidth limited anyway, so your "music" may not be real clear.
good luck
donald
You mean, first convert the voice into digital using an ADC than store it into EEPROM and while playing it keep sending EEPROM data to DAC?? that will ask for a huge EEPROM even for 30 sec (may be >1Mb, if i sample at 50k). Though i've nevr tried audio signals on ADC/DAC, i can try this one, but isn't there some simpler solution with inbuilt DAC
+memory+ADC???It's more than DAC+Memory+ADC........ how is the memory controlled....... how will you clock the address lines of the memory and detect the end and loop arround?
have you looked at a 64kx8 memory? how any data lines , how many address lines.... how will you clock the address lines..
A micro can take care of all this logic.
Joe
Another possibility is the ISD4004 (or similar chips) avail from Digikey. Search on Keyword =3D "Winbond", then click Voice Recorders...
Some of these are stand-alone, but limited voice storage / quality. Don't know your spec's, so can't recommend any particular ones. I do know the ISD4004' will instantly loop.
The remaining ones will require a small micro, but your overhead in code will be greatly simplified by using one of these outboard voice chips. Just select the address and function (play record, etc..), and you're ready to rock and roll.
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Thanx man, m going to use ISD1740 with 40sec recoring time, Ithink that one will do. I've got ATmega32 kit also with ADC & DAC onboard, i need only a memory chip., for my experiment sake, i'll try that one,too!! Thank you for the response, guys!
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.), and
Cool. Glad to help. Good luck. Looking at the datasheet, you may want to amplify the audio. If so, and if you have 12-volts, take a look at the National Semiconductor LM4950 Minimum parts. Plenty of oomph for the money.
-mpm
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