Speech Synthesis LSI with External Memory

Speech Synthesis LSI with External Memory

External memory compatible speech synthesis LSIs ML226xx and ML224xx can connect up to 128Mbit serial memory externally.
Ideal for long Sound playback.

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      Supporting Information


      Speech Synthesis LSI with External Memory
      Internal AB-class/D-class Speaker Amplifier Type:ML226xx series Internal AB-class Speaker Amplifier Type:ML224xx series


      Up to 128Mbit serial memory can be connected

      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 audio playback.

      • Speech Synthesis LSI special site

      Product features

      Features 1Speech Synthesis LSIs control external memory, facilitating voice generation

      Easily enable voice generation from external memory

      Controlling external memory allows Speech Synthesis LSIs to play back audio data without placing a load on the MCU.
      Voice 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

      HQ-ADPCM enables high fidelity audio compression

      The ML226xx series adopts the newly developed high fidelity, high compression voice algorithm HQ-ADPCM that provides a clearer sound and richer audio 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.Ky's ロゴ

      Feature 3Integrated Class D amp ensures high efficiency output

      Speaker Output Power vs. Efficiency

      Class D speaker amps are capable of 1.0W (Max) output, feature low heat generation even at high (audio) 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


      Speech synthesis LSI Application for External memory

      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.