PRELIMINARY
Publication Release Date May 2003
- 1 -
Revision 3.09
WTS701
WINBOND SINGLE-CHIP TEXT-TO-SPEECH PROCESSOR
The information contained in this datasheet may be subject to change without
notice. It is the responsibility of the customer to check the Winbond USA website
(
www.winbond-usa.com
) periodically for the latest version of this document, and
any Errata Sheets that may be generated between datasheet revisions.
WTS701
- 2 -
1. GENERAL DESCRIPTION
The WTS701 is a high quality, fully integrated, single-chip Text-to-Speech solution that is ideal for use
in applications such as automotive appliances, GPS/navigation systems, cellular phones and other
portable products or accessories. The WTS701 product accepts ASCII (Unicode and Big5 for
Mandarin) input via a SPI port and converts it to spoken audio via an analog output or digital CODEC
output.
The WTS701 integrates a text processor, smoothing filter and multi-level memory storage array on a
single-chip. Text-to-speech conversion is achieved by processing the incoming text into a phonetic
representation that is then mapped to a corpus of naturally spoken word parts. The synthesis
algorithm attempts to use the largest possible word unit in the appropriate context to maximize natural
sounding speech quality. The speech units are stored uncompressed in a multi-level, non-volatile
analog storage array to provide the highest sound quality to density trade-off. This unique, single-chip
solution is made possible through Winbond's patented multilevel storage technology. Voice and audio
signals are stored directly into solid-state memory in their natural, uncompressed form, providing
superior quality voice reproduction.
The chip can be programmed through the SPI port, allowing downloading of different languages and
speaker databases when made available by Winbond.
WTS701
Publication Release Date: May 2003
- 3 -
Revision 3.09
2. FEATURES
Fully Integrated Solution
Single-chip compact text-to-speech translation
No algorithm development required
Selectable digital and analog audio output
Simple SPI interface
Reprogrammable solution enables loading different voice or language
Text-To-Speech Algorithm Characteristics
High quality speech synthesis using speech element concatenation
Winbond's standard 100-year speech retention
Audio stored as uncompressed analog waveform industry's highest quality and most natural sounding
Easy to Use and Control
Real time conversion for streaming text
General text preprocessing and normalization
User customization for special characters such as SMS icons and chat emoticons
User customization for application specific abbreviations
Language Support
Support U.S. English and Mandarin (Beijing dialect)
Other languages in development or in planning
Device Management
Accepts ASCII, Unicode or Big5 streaming text
256-byte text buffer
Playback of Phonetic Alphabet
Variable speed playback
Control of pitch change
Supports Power Down mode.
Supports Pause and Resume, Stop and Finish text conversion commands
Embedded characters support to control speed, volume, case sensitivity, and silent behavior
Peripheral Control
16-bit linear PCM slave interface output support
SPI serial port for control commands and status report to system's host controller
Hardware handshake control signals
Analog audio output with 8
speaker driver, digital volume control and line level o/p
Analog audio input (AUXIN) for driving external audio to the speaker
Low Power Consumption
+2.7 to +3.3V (V
CC
) Supply Voltage
Operating Current:
I
CC Convert
= 35 mA (typical)
Standby Current:
I
SB
< 1
A (typical)
Device Characteristics
Available in 56-lead TSOP package
Industrial temperature range (-40C to +85C)
3V/5V logic tolerance
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