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ML2272x/ML2276x series

Speech synthesis LSI built-in speech-speed/pitch conversion with 4M/8M/18M bit large scale P2ROM™

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 the elderly 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.

Speech-speed/pitch conversion function
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.
Supports the development by evaluation board and special writer.
3 products (with the capacities of 4M, 8M, and 16M bits) lined up
CPU IF: SPI(ML2272x), I2C(ML2276x)

Parameter	Specification
Part number	ML2272x/ML2276x series datasheet[pdf]
Speech synthesis method	4bit ADPCM2 8bit non-linea PCM 8bit PCM, 16bit PCM (can be specified for each phrase)
Sampling frequency Fosc=4.096MHz	4.0k, 5.3k, 6.4k, 8.0k, 10.7k, 12.0k, 12.8k , 16.0k ,21.3k ,24.0k, 25.6k ,32.0k, 48.0kHz (Each phrase can be specified.)
Speaker amplifier output	0.7W(8&Omega, 5V)
Number of playback phrases	Max.4,096 phrases(ML22725)
Speech speed conversion function	Playback speed from 0.5times to 2.0times
Pitch conversion function	±20% (40 levels: 1% step range)
Other functions	Volume control function, Repeat function, ROM edit function
Operating power supply voltage	+2.7V to +5.5V
Clock frequency	4.096MHz
Operating temperature range	-40°C to +85°C
Package	30pin plastic SSOP (2-direction lead type, 0.65mm lead pitch)

ML2272x package dimension figure
Package Diagram

Playback Time

(at 4bit ADPCM2 method)

*When speech-speech/pitch conversion function is not used.
Part number	Memory type	ROM capacity (bit)	Maximum playback time(s)
Part number	Memory type	ROM capacity (bit)	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

ML2272□series

Speech-Speed / 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 enables the pitch settings at 40 levels within the range of ±1%. 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.

*Sodiac is a trademark of AREX Co.

Operation guidance for household electrical appliances
- White home appliances
- Cooking appliances
- Air conditioners
House equipment
- Water heater
- Fire alarm
Security
- Alarm and antitheft security system
On-vehicle applications
- ETC/radar detector

Typical Application Example

ML2272□series

Speech Synthesis LSI

Flexvoice

*P2ROM™(Production Programmed ROM)

The above logos are trademarks of LAPIS Semiconductor CO., LTD.
The top logo for Speech LSI is a registered trademark in the U.S.

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