Posted on Jan 13, 2013

The circuit, a general-purpose system with many uses, vocalizes 59 allophones contained in the speech processor. After filtering and amplification, its pulse-code-modulated output can drive an 8-!l speaker. The processor`s address pins, Al to A6, define 64 speech-entry points. Closing the test switch to the NAND gate lowers its output, thereby loading an address and triggering the ALD input for an allophone cycle.

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The CD4520 dual binary counter, IC2, counts from 0 to 63 in binary code until its Q7 output resets it on the number 64 count. To generate a phrase, just add an EPROM between IC2 and IC3 that contains a program for a predetermined sequence of allophones.

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