aIVR FAQ

  • What's the making process of “ APLUS aIVR serial OTP “ ?
    There are three steps : Editing, Compiling and Programming.
  • What kind of voice file format should be sent to Aplus ?
    We accept mp3、wav、aif、wma、avi、mpeg.
  • What kind of voice format can be accepted by aIVR serial OTP ?
    It accepts MONO、8BIT、WAV.
  • How to program OTP Voice Chips (aIVR Series OTP) ?
  • Why it appears “ is not a 8-bit mono wave file “ even we follow “ MONO、8BIT、WAV “ ?
    Because you didn’t use our suggest editing software.Usually we suggest use SOUND FORGE、GOLD WAVE、COOL EDIT and so on.
  • Why some “ Hiss Hiss “ noise produced from the IC ?
    There will be a little distorted when the voices transfer to our acceptable format. So, we need some editing software to modify the voices to improve the quality. Raising sample rate or using PCM compression will be helpful. If you any further voice quality the request, pls contact our editing engineer edit@aplusinc.com.tw
  • Can I mix different sample rate in the same one aIVR series IC ?
    Yes ! You can mix different sample rate.
  • If I compile the voice output is VOUT ( PWM ), can I use COUT ( DAC ) for Instead ?
    No ! Because their RAMP UP & RAMP DOWN are different, if you do not use your compiling output in your application , it may produce “ Po “ noise before or after you play the voices.
  • If I compile the voice output is COUT ( DAC ), can I use VOUT ( PWM ) for Instead ?
    No ! Because their RAMP UP & RAMP DOWN are different, if you do not use your compiling output in your application , it may produce “ Po “ noise before or after you play the voices.
  • When we use “ DAC “ to drive speaker, the 8050 transistor will heat. Is it normal ?
    Because 8050 transistor belongs to A type amplifier, its high temperature is normal.To avoid this situation happened, we suggest you use APLUS “ AP4890B “ audio power amplifier to improve it.
  • If the power circumstance is not good in my circuits, will it affect the voice quality ?
    If there are any noise existing in the power supply, these noises will be easy through the IC power supply transmit to affect the voice quality. We suggest connect a capacitor between vdd and vss. Becouse of the different circumstances the value of capacitors will be not fixed , but you can try 10uF at first.
  • What's the operating current when the aIVR serial OTP is playing ?
    The operating current of the IC itself is about 15mA, if you use” PWM “ to drive speaker directly, the total current will be about 50 ~ 70mA. If you use “ COUT “ add transistor to drive speaker, the total current will be from 120mA to 250mA depends on what speakers & transistors you use.
  • If the pow affect the voice quality ?
    IC will automatically enter sleep mode after finish playing. So its operating current will be less than 1-5uA.
  • What's the sample rate in APLUS aIVR serial OTP ?
    All are based on 4bit 6KHz sample rate. It means if you run out all the length, the best sample rate is 4bit 6KHz.
  • What sample rate will have better result ?
    It depends on your original voices . General speaking, high sample rate has better effect. But, some special voices they need low sample rate instead.
  • What's the max. sample rate can be reached ?
    We suggest 20KHz sample rate is the highest one in every project. If over 22KHz, the IC frequency will be easily unstable.
  • What's the min. sample rate that can be accepted ?
    According to our experience, 8KHz sample rate will be accepted by 70% of customers.
  • Can we use MIDI or Melody format in aIVR serial OTP ?
    No. But, we can utilize software to transfer MIDI or MELODY to WAV format then we can program them into our OTP.
  • What kind of speaker is suitable in aIVR serial OTP ?
    We use 8Ohm, 0.25W speaker generally.