MSM9810 View Datasheet(PDF) - Oki Electric Industry

Part Name

Description

Manufacturer

MSM9810

8-channel Mixing OKI ADPCM Type Voice Synthesis LSI

Oki Electric Industry 

¡ Semiconductor

MSM9810

4. Reset Function

When “L” level is input to the RESET pin, LSI enters power down state, stopping oscillation and

minimizing current consumption. At the same time, the control circuit is reset and initialized.

Power down status is as follows.

(1) Oscillation stops and all internal circuits stop operation.

(2) Current consumption is minimized. When an external clock is in use, input “L” level

to the XT pin in power down status, so that current does not flow into the oscillation

circuit.

(3) When a crystal oscillator is in use, “L” level is output to the XT pin.

(4) GND level is output to the D/A output pin (LDAO, RDAO).

Be certain to input “L” level to the RESET pin when power is turned on.

␣

5. Playback System

This LSI has four types of playback systems to support various voices: 4-bit ADPCM, 4-bit

ADPCM2, 8-bit straight PCM, and 8-bit non-linear PCM.

5-1 4-bit ADPCM

ADPCM (Adaptive Differential Pulse Code Modulation) system adaptively changes the

quantization width and encodes 4-bit data for each sampling, so that the follow up to a voice

waveform improves.

ADPCM data is converted by using an analysis tool.

For a human voice, animal voice and natural sounds, it is better to use the ADPCM system

because the voice data capacity decreases.

5-2 4-bit ADPCM2

In 4-bit ADPCM 2, the follow-up characteristics to a voice waveform is even better than the 4-bit

ADPCM. This system is compatible only with MSM9841/MSM9842.

ADPCM2 data is converted by using an analysis tool.

5-3 8-bit Straight PCM

The follow-up characteristics to a voice waveform to all voice areas is the best of all four types.

This system is suitable for sound effects, where waveforms change rapidly, and for pulse shape

waveforms.

5-4 8-bit Non-linear PCM

This system plays back the center of a waveform to be a voice quality equivalent to 10 bits. This

system is to improve the voice quality of low volume sounds.

8-bit non-linear PCM data is converted by using an analysis tool.

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