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ISD Voice Record/Playback Chip...Help

Discussion in 'Electronic Design' started by [email protected], Sep 17, 2003.

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  1. Guest

    I want to record some wave sounds from my computer to the chip but the
    electret microphone has terrible quality and hiss. Can I hook it
    directly to my sound card bypassing the mike somehow?

    I've been just holding it up to the speaker.

  2. Jim Thompson

    Jim Thompson Guest

    The data sheets are on the website:

    ...Jim Thompson
  3. Guest

  4. Active8

    Active8 Guest

    what data sheet? the first sheet i picked from the above link shows an
    aux input which will accept a 694mV p-p nominal input at the 0dB gain
    setting which is 3dB below clipping.

    the max sample rate is 8kHz so i wouldn't expect to be able to record
    anything much higher than voice frequency. that might be why your
    recordings sound crappy. especially if the sample rate is set lower. you
    could also be holding the mic too close to a loud source. FYI, if you
    talk on a 2-way radio, keep your mouth away from the thing. too many
    people shout into radios and it sounds crappy.

    i'd just run the line out of my sound card into the aux in thru a volume
    control, making sure not to exceed the input spec.
    Line Out -|___|------+
    R1 |
    | |<----- Aux In
    R2 | |

    Vout_max = Vline_in * R2/(R1+R2)

    created by Andy´s ASCII-Circuit v1.22.310103 Beta

    have fun,
  5. Guest

    Thanks Mike, I'll give it a try!
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