msm9811 Oki Semiconductor, msm9811 Datasheet - Page 24

• Manufacturer Part Number: msm9811
• Description: 4-channel Mixing Oki Adpcm Type Voice Synthesis Lsi
• Manufacturer: Oki Semiconductor

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.
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.
OKI Semiconductor
Oki 4-bit ADPCM
Oki 4-bit ADPCM2
Oki 8-bit Nonlinear PCM
8-bit PCM
Voice synthesis algorithm
max: 0x7ffffff
max: 0x7ffffff
ROM address
Normal voice waveforms
Normal voice waveforms
Sound
high frequency components
Sound
high frequency components
0x0007FF
0x000800
0x000000
Applicable waveform
effects
effects
This area is used to create
including
including
Phrase control table area
Voice management area
Voice data area
(16 Kbit fixed)
ROM data.
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
Feature
FEDL9811FULL-04
MSM9811
24/44