WTS701MMSLASHT datasheet(41/77 Pages) WINBOND

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WTS701

Publication Release Date: May 2003

- 41 -

Revision 3.09

7.4.4 System Operation

The WTS701 is a single chip solution for text-to-speech synthesis. The Text-to-Speech operation is

accomplished by a process of screening the incoming text to normalize common abbreviations and

numbers into a spoken form. The normalized text is then analyzed for phonetic interpretation and this

phonetic translation is mapped into samples to be played out of the analog storage array. This output

signal is then smoothed by a low-pass filter and is available as an analog signal, or can be passed

through the CODEC for digital audio output.

The WTS701 processor state machine

The WTS701 functions as a state machine and changes states either in response to a command sent

by the host controller, after execution of command is completed, or as a result of an internal event.

The WTS701 states are described below in reference to Figure 10.

Power Down

Idle

Wait

Convert

Reset

Figure 10. WTS701 Processor States

Vcc Applied

Hard Reset

Idle

Convert

PWUP

PWDN, Soft Reset

Hard Reset

Soft Reset, PWDN

Stop

finish

finish word

conversion finished

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