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speech synthesis speaker — Parallax Forums

speech synthesis speaker

SHechtSHecht Posts: 5
edited 2010-03-14 21:09 in Propeller 1
I've been reading the new official propeller guide and wanted to try out the speach synthesis programs but I can't figure out how to wire up a speaker.· I've done some experiments in the tutorials with the tiny piezo speakers but that's about as far as my knowledge goes.· I thought maybe an 8 ohm mini speaker would be large enough to produce speach but I don't know what "delta-modulation," or "RC filtering" or "direct transducer driving" mean.· I also see that both positive and negative for the speaker are coming directly from the logic pins!· I tried getting some insight by surfing the web but I'm only more confused.

Comments

  • w8anw8an Posts: 176
    edited 2010-03-13 15:25
    At the minimum, you'll want to put a capacitor in series with your speaker.

    Hook one side of a 100uF to 1000uF capacitor to the Prop pin, hook the other side of the cap to your speaker. The other side of the speaker goes to ground.

    The audio will likely be very low without an amplifier.
  • VIRANDVIRAND Posts: 656
    edited 2010-03-13 21:16
    Amplified computer speakers are recommended.
    Radio Shack part number 277-1008 or 277-1008c has been used for this purpose since the days of the TRS-80 Model 1,
    when sound was output through the tape recorder. The product is a small amp speaker that runs on a 9 volt battery.
    An earphone plug (or Walkman headphones plug, 1/8'') will be needed to connect it to the propeller.

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  • Toby SeckshundToby Seckshund Posts: 2,027
    edited 2010-03-13 21:26
    I didn't know that these were still being made. They were so useful, on OBs, audio and video could bet proved with one.

    If anybody queried why you were listening to the tizzy buzz of the video, a glib comment about there being a not right with the differential phase, with a concentrated listen, would confuse them.

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  • SHechtSHecht Posts: 5
    edited 2010-03-13 23:09
    Thanks for the help. I found the schematic for the Parallax audio amplifier AppMod and I'm using that for as a recipe to build one. I'll post again tomorrow if it works.
  • SHechtSHecht Posts: 5
    edited 2010-03-14 17:33
    I soldered the amplifier together and everything is working fine. Thanks for your help!
  • w8anw8an Posts: 176
    edited 2010-03-14 21:09
    Let us know when you get that speech synthesizer uttering some crazy talk!
    freaked.gif

    -Steve
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