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External Memory - Internal AB-class Speaker Amplifier Type
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Supporting Information
Speech Synthesis LSIs with External Memory
Internal AB-class/D-class Speaker Amplifier Type Internal AB-class Speaker Amplifier Type
Overview
External memory compatible speech synthesis LSI can connect up to 128Mbit serial memory externally.
Because it supports a large memory, it is ideal for long playback.
Product features
Features 1Speech Synthesis LSIs control external memory, facilitating sound generation
Controlling external memory allows Speech Synthesis LSIs to play back sound data without placing a load on the MCU.
Sound generation is easily achieved by inputting control commands of only a few bytes from an MCU.
Features 2High fidelity, high compression HQ-ADPCM*1 makes it possible to reduce the memory capacity
The ML226xx series adopts the newly developed high fidelity, high compression sound algorithm HQ-ADPCM that provides a clearer sound and richer sound range while reducing data size compared with conventional ADPCM, providing a more comfortable listening experience.For example, melodies and sound effects that are degraded with ADPCM and cannot be played with uncompressed PCM can be compressed with HQ-ADPCM, ensuring superior sound quality while reducing memory capacity.
Up to 80% compression is possible vs 4bit ADPCM and 20% compared with 16bit ADPCM.
Applicable Models : ML22620、ML22660
*1 : HQ-ADPCM is Ky's high-quality sound compression technology.
Ky's is a registered trademark of Kyushu Institute of Technology.
Feature 3Integrated Class D amp ensures high efficiency output
Class D speaker amps are capable of 1.0W (Max) output, feature low heat generation even at high (sound) volumes, and minimize heat dissipation measures.
In addition, efficiency is excellent at low battery power, reducing current consumption and prolonging battery life.
Applicable Models : ML22620、ML22660
Applications
LAPIS TECHNOLOGY™ 's External Memory compatible Speech Synthesis LSI is ideal for a melody system, zoo, museum guide, instruction manual, healing goods, radar detector, kids book, etc. lasting from tens of seconds to several minutes.
The capacity of external memory is free.
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