View single post by sparks
 Posted: Dec 14th, 2011 12:27 PM
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sparks



Joined: Jan 15th, 2008
Location: New Zealand
Posts: 77
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 The Talker Box has 3 chips:
A 12F683 PIC, the Speakjet, and a LM386 Audio amp.
An antenna is connected to one of the A/D inputs of the PIC. The PIC firmware takes readings of the incident emf voltage on that input port and converts it to a number. There is scaling and offsetting of that number value (and probably shuffling) to align that value to be within the control value range of the allophone set in the Speakjet chip. The PIC then sends these allophone control commands to the Speakjet via 9600 baud serial link.
As Joe has mentioned previously, you can just send white noise to the data input of the speakjet chip and it will also talk.
JEFF

P.S If you know someone in the USA, they could buy you a Talker from Digital Dowsing, and post it on to you?

Last edited on Dec 14th, 2011 12:29 PM by sparks