Semiconductor Business Group Home > Integrated Circuits > Speech & Audio > Speech Synthesis LSIs > ML2272X/ML2276X Series
ML2272X/ML2276X Series
|ML2282X/ML2286X Series |ML2272X/ML2276X Series |ML2280X Series |ML2216 |ML2250 family |MSM9800 family |ML2210 family |ML2201/MSM9831 |ML22420/ML22460 |
Speech Synthesis LSI Built-in Speech-Speed/Pitch Conversion Functions
Overview
The ML2272X/ML2276X Series is a speech synthesis LSI that enables adjustments of the speech playback speed and pitches. The LSI enables speech playback slowly without changing the pitch, or increase or reduce the pitch without changing the speed. This enables voice guidance that can be easily understood by old people and change of voice tone of the guidance that is output by the alarm device according to the degree of urgency.
By using P2ROM memory in the memory section, the turn-around time from fixing of speech data to shipment has been reduced significantly. The built-in amplifier enables speech playback simply by directly connecting a speaker.
Features
- Built-in Speech-Speed Conversion/Pitch Conversion Functions
- Long-time playback of 1044 seconds in maximum
Large memory size to handle the increase of incorporation of speech data and high quality speech
- Built-in amplifier
- Memory bank function
The built-in memory can be divided, enabling a new way of using speech LSI such as increase of the number of playback phrases.
- The use of P2ROM allows TAT to be significantly reduced.
- programing tools
- 3 products (with the capacities of 4M, 8M, and 16M bits) lined up
- CPU Command Interface
ML2272X : SPI , ML2276X : I2C
Major Specifications
| Item | Specification |
| Speech synthesis method |
OKI 4-bit ADPCM2 |
|
Sampling frequency |
4.0k, 5.3k, 6.4k , 8.0k, 10.7k, 12.0k, 12.8k, |
| Speaker amplifier output | 0.7 W @ (8, 5V) |
| Playback phrase count | Up to 4,096 phrases (ML22725) |
| Speech speed conversion function | ~0.50 to ~2.00 (150 levels: 0.01 step) |
| Pitch conversion function | }20% (40 levels: 1% step width) |
| Other functions | Volume control, Repeat function, Edit ROM function |
| Operating power supply voltage | +2.7 to +5.5V |
| Clock frequency | 4.096MHz |
| Operating temperature range | –40 to +85 C |
| Package |
30-pin plastic SSOP |
Playback Time
(OKI 4-bit ADPCM2)
| Product name | Memory type | ROM capacity (bits) | Maximum playback time (s) | ||
|---|---|---|---|---|---|
| fs=4.0k | fs=8.0k | fs=16.0k | |||
| ML22725 / ML22765 | P2ROM | 16M | 1044 | 522 | 261 |
| ML22724 / ML22764 | 8M | 520 | 260 | 130 | |
| ML22723 / ML22763 | 4M | 258 | 129 | 64 | |
(Speech -speed or pitch conversion functions is not used.)
Block Diagrams
ML2272X Series
Speech-Speed Conversion/Pitch Conversion Functions
The speech-speed conversion function enables the settings of playback speed in 150 steps from 0.5 times to 2.0 times. In this case, the pitch is hardly affected by the playback speed.
The pitch conversion function can convert the pitch of the original sounds up to 20% (40 levels) in 1% steps. In this case, the playback speed is hardly affected by the pitch.
Sodiac of AREX is used for the speech-speed conversion/pitch conversion techniques.
@
is a trademark of AREX.
Application Examples
• Operation guidance for household electrical appliances
- Cooking appliances
- Air conditioners
• Household equipment
- Water heater
- Fire alarm
• Security
- Alarm and antitheft security system
• On-vehicle applications
- ETC/radar detector
Application Circuit
ML2272X Series (DVDD = SPVDD = 5V)
*P2ROM (Production Programmed ROM)
P2ROM and the logo above are registered trademarks of OKI.
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