ML22Q533 datasheet(27/178 Pages) ROHM

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FEDL22Q53X-02

ML22Q53X

● Speech synthesis algorithm

This LSI contains five algorithm types to match the characteristic of playback sound: 4-bit ADPCM2 algorithm,

HQ-ADPCM algorithm, 8-bit non-linear PCM algorithm, 8-bit straight PCM algorithm, and 16-bit straight PCM algorithm.

Key feature of each algorithm is described in the table below.

Speech synthesis

algorithm

Compression

rate

Feature

HQ- ADPCM

1/5

4bit ADPCM algorithm is improved. Adopting variable bit length

enables high sound quality and high data compression. Suitable for

sound effects with sharp changes in waveforms or for pulsed

waveforms.

4-bit ADPCM2

1/4

LAPIS original 4bit ADPCM algorithm is improved. Better

followability to the waveform improves the sound quality. Suitable for

human voices, animal crying, and natural sounds.

8-bit non-linear PCM

1/2

This algorithm enables playing back a sound with 10-bit equivalent

quality in the center of the waveform. Suitable for low-amplitude

sounds that are easily distorted.

8-bit straight PCM

1/2

This algorithm has excellent followability to the waveform in all

sound areas. Suitable for sound effects with sharp changes in

waveforms or for pulsed waveforms.

16-bit straight PCM

This algorithm has excellent followability to the waveform in all

sound areas. Suitable for sound effects with sharp changes in

waveforms or for pulsed waveforms.

*1: When using the same sampling frequency.

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ML22Q533 Datasheet(PDF) 27 Page - Rohm