aMTP FAQ

  • Why we have ” aSPI28W_Vxxx”and ” imEdit_Vxxx”two different software?
    The “aSPI28W_V100”accept 8BIT , MONO , WAV format is for the ones who are familiar voice editing.

    The imEdit_Vxxx accept 16Bit , stereo , wav format is for the ones who are not familiar voice editing.If you any problems, pls contact our editing engineer edit@aplusinc.com.tw

  • What's the making process of “ APLUS aMTP serial“ ?
    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 aMTP serial OTP ?
    It accepts MONO、8BIT、WAV.
  • Why it appears “ This file is not a PCM,8BIT,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 aMTP 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.
  • What's the operating current when the aMTP serial IC 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 30mA. If you use “ COUT “ add transistor to drive speaker, the total current will be from 220mA to 300mA depends on what speakers & transistors you use.
  • What's the operating current when we finish playing ?
    IC will automatically enter sleep mode after finish playing. So its operating current will be less than 15uA.
  • What's the sample rate in APLUS aMTP serial IC ?
    All are based on 8bit 6KHz sample rate. It means if you run out all the length, the best sample rate is 8bit 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 aMTP serial IC ?
    No. But, we can utilize software to transfer MIDI or MELODY to WAV format then we can program them into our MTP IC.
  • What kind of speaker is suitable in aMTP serial IC ?
    We use 8Ohm, 0.25W speaker generally.