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Continuous Sound Playing IC

Discussion in 'Electronic Design' started by CCD, Jul 28, 2008.

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  1. CCD

    CCD Guest

    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.!
     
  2. 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.
     
  3. CCD

    CCD Guest

    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
     
  4. mpm

    mpm Guest

    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.

    http://www.eletech.com/Products/products.htm

    Eletech also has a QuickVoice chip set available.
    Been a long time since I played with them.

    Good luck.
     
  5. CCD

    CCD Guest

    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???
     
  6. CCD

    CCD Guest

    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.
     
  7. 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
     
  8. mpm

    mpm Guest

    Another possibility is the ISD4004 (or similar chips) avail from
    Digikey.
    Search on Keyword = "Winbond", then click Voice Recorders...

    http://search.digikey.com/scripts/DkSearch/dksus.dll?Cat=2556441;keywords=Winbond

    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.
     
  9. CCD

    CCD Guest

    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!
     
  10. Eeyore

    Eeyore Guest

    Holtek do some audio chips. Not sure if they'd fit your application.

    Graham
     
  11. mpm

    mpm Guest

    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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