MSM9811GA View Datasheet(PDF) - Oki Electric Industry

Part Name

Description

Manufacturer

MSM9811GA

4-Channel Mixing OKI ADPCM Type Voice Synthesis LSI

Oki Electric Industry 

OKI Semiconductor

FEDL9811FULL-04

MSM9811

Voice Synthesis Algorithms

The MSM9811 contains 4-bit ADPCM algorithm, 4-bit ADPCM2 algorithm, 8-bit straight PCM algorithm, and

8-bit non-linear PCM algorithm. One of these algorithms can be selected depending on the kind of voices to be

played. The features of these algorithms are described below.

Voice synthesis algorithm

Oki 4-bit ADPCM

Oki 4-bit ADPCM2

Oki 8-bit Nonlinear PCM

8-bit PCM

Applicable waveform

Normal voice waveforms

Normal voice waveforms

Sound effects including

high frequency components

Sound effects including

high frequency components

Feature

Oki-original 4-bit ADPCM

An improved version of Oki-original 4-bit ADPCM.

This algorithm has improved its waveform

traceability.

This algorithm plays back the center of waveform

as a 10-bit sound.

Normal 8-bit PCM algorithm

Memory Configuration and Voice Data Creation Method

The ROM data consists of a voice management area, a voice data area, and a phrase control table area.

The voice management area controls the voice data start address, voice data end address, and use of the phrase

control table.

256 phrases of voice management data are stored in this area.

The voice data area stores actual waveform data.

The phrase control table area stores data for effectively using voice data. See “Phrase Control Table Function” for

details.

The ROM data is created by using a dedicated tool.

ROM address

0x000000

0x0007FF

0x000800

Voice management area

(16 Kbit fixed)

Voice data area

max: 0x7ffffff

max: 0x7ffffff

Phrase control table area

This area is used to create

ROM data.

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