WTS701MFSLASHT datasheet(11/77 Pages) WINBOND

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WTS701

Publication Release Date: May 2003

- 11 -

Revision 3.09

7. FUNCTIONAL DESCRIPTION

As a real System-On-Chip solution, the WTS701 performs the overall control functions for host

controller and text-to-speech processing.

The WTS701 system architecture consists of the following functions:

•

Serial interface to monitor the SPI port and interpret commands and data

•

Text normalization module to pre-process incoming text into pronounceable words

•

Words to phoneme translator, which converts incoming text to phoneme codes

•

Phoneme mapping module that maps incoming phonemes to words, sub-words, syllables or

phonemes present in the MLS memory

•

Volume and speed adjustments

•

Digital and analog output blocks for off-chip usage

The WTS701 system performs text-to-speech synthesis based on concatenative samples. The units

for concatenation can vary from whole words down to phoneme units. The convention is that the

larger the sub-word unit used for synthesis the higher the quality of the speech output. A corpus of

pre-recorded words is stored in Winbond’s patented multilevel storage (MLS) memory and a mapping

of the various sub-word parts is held in a lookup table. The speech creation is achieved by

concatenation of these speech elements to produce words. The system process flow is shown in

Figure 5.

Text Normalization

Words to Phoneme

Phoneme Mapper

MLS

Memory

Digital

output

Analog

output

WTS701

Speech

Serial Text,

symbols &

Control

Figure 5. WTS701 System Process Flow.

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