The adaptive pulse code modulation mode is to change the digital quantity according to the conversion rate of the voice analog signal, that is, in the pulse code modulation mode. Change its quantization amplitude accordingly. usually. The sound quality of the speech synthesized by the adaptive pulse code modulation method is better than that of the digital pulse code modulation method. This kind of speech synthesis method mainly uses an external memory to form the voice interface of a long-term voice broadcast system or other products. The figure shows the typical application circuit of the HT83XXX series.
The HT82013 has 20 levels of binary counting and 3 selective output speech synthesis circuits. Adopt 24-pin dual in-line plastic package. The power supply voltage is 3.5V～5V, the working current is 2.8mA, and the quiescent current is 5μA. HT82013 is a speech synthesis circuit with external EPROM, which can be connected with 3 X 8MB EPROM. The voice length can be up to 1368 seconds.
The following figure shows the application circuit diagram of the HT82013.
2.54mm Pitch
2.54mm Pitch
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