Designing with Speech Processing Chips by Ricardo Jimenez

By Ricardo Jimenez

This paintings presents the idea and easy layout instruments had to use speech processing chips successfully in circuit layout. Speech processing chips are strong, really expert built-in circuits used to supply synthesized voice output and/or voice reputation enter for lots of forms of automatic structures. The publication provides layout examples for a variety of real-world purposes and exhibits tips on how to interconnect a few of the parts (speech chips, sensors, A/D converters, and audio system) into practical gear for instrumentation, information processing, and regulate platforms. It additionally covers a few of the most well liked speech synthesis, speech acceptance, and electronic sign processing (DSP) chips out there and summarizes the real features of every.

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01. In both cases, EPROM IC5 remains unaltered; that is, with the same program, but you will have to program the controlling EPROM (IC4) to fit the scale with which you are working. 7. The circuit presented in this section can be simplified by using a micro­ controller or a microsequencer; these topics will be treated in detail in the fol­ lowing section and chapters.

The stand-alone version comes in a 60-pin plastic Flat or 68-pin PLCC. The MPU interface version comes in a 44-pin plastic flat or 40-pin plastic DIP. (SST). These devices are classified as KS5901A, KS5902XX, KS5911, and KS5912XX, using the encoded reproduction algorithm LPC. Speech is compressed by processing an externally provided variable bit stream of encoded LPC speech data. The result is then converted to an audible output with an on-chip 9-bit D/A converter. 5 shows the principal characteristics of the four kinds of speech synthesizers available from SST.

For ex­ ample, if the 8-bit data input contains the binary number Q 8 - Q 1 = 0000 0001, EPROM IC4 receives only a logic one at the address input A4; there­ fore, this EPROM goes to address 16 (10#h) where the data stored must corre­ spond, in this case, to hex number 01#h. Now, the second EPROM (IC5) also receives the address sixteen (10#h). All this takes about 915 ns. 3 V @ 5 V). 2 ^ts (2200 ns). This delay is inserted to give sufficient time to both EPROMs to find the first block of memory.

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