ML22594 is a high-quality speech synthesis LSI with built-in 6Mbits Mask ROM and compatible with up to 128Mbits external memory. It ensures operation between -40 to +105°C(automotive-grade) with built-in speaker amplifier.
Customers development and stock control can be made easy by using usage which stores a common voice data in built-in ROM, and stores a difference voice extension data based on a product in external ROM.
Max. 5240 seconds long time playback is possible when 128Mbits external ROM is connected. (at sampling frequency 8.0kHz on HQ-ADPCM)
And functions necessary for voice output, such as 4-channel mixing, repeat playback, edit function, are all integrated into a single chip.
In addition, sound data can be easily created by utility software "Speech LSI Utility".
|Max. ROM capacity||Fs=8kHz||Fs=16kHz||Fs=32kHz|
|Speech synthesis method||HQ-ADPCM*
8 / 16bit straight PCM
（Can be set method for each phrase）
|Speech ROM capacity||Built-in 6Mbits ROM, External 128Mbits ROM ( Max )|
|12.0 / 24.0 / 48.0kHz
8.0 / 16.0 / 32.0kHz
6.4 / 12.8 / 25.6kHz
|Analog output||1.0W Speaker amplifier / Low-pass filter / Built-in 16-bit D/A converter|
|Interface||Clock synchronous serial interface|
|Max. No. of phrases||1024 ( Built-in ROM : 512、External ROM : 512 )|
|Edit ROM function||○|
|Volume control||32 levels|
|Channeｌ mixing function||4 channels|
|Operating power supply voltage||+4.5V to +5.5V|
|Operating temperature||-40°C to +105°C|
|Package||30pin plastic SSOP|
*HQ-ADPCM is a high sound quality audio compression technology of "Ky's".
"Ky's" is a registered trademark of National University Corporate Kyushu Institute of Technology.