MSM9831 View Datasheet(PDF) - Oki Electric Industry

Part Name

Description

Manufacturer

MSM9831

VOICE SYNTHESIS LSI with on-chip 384Kbit MASK ROM

Oki Electric Industry 

¡ Semiconductor

MSM9831-xxx

The playback time is obtained by dividing the memory capacity by the bit rate.

The playback time for 8-bit PCM algorithm is obrained by using the following equation.

Memory capacity [bit]

Playback time [sec] =

=

Bit rate [bps]

Memory capacity [bit]

Sampling frequency [Hz] ¥ 8 [bit]

For example, if all phrases are stored in the MSM9802 at 8 kHz sampling frequency, the

maximum playback time is as follows.

(384–6) ¥ 1024 [bit]

Playback time =

= 6.0 [sec]

8000 [Hz] ¥ 8 [bit]

3. Playback Method

The MSM9831 uses OKI non-linear PCM algorithm.

In the mid-range of waveform, OKI 8-bit non-linear PCM has precision equivalent to that of 10-

bit straight PCM.

4. Inserting Silence

In addition to normal recorded sound phrases, the MSM9831 allows a user to play back or insert

silence (silent phrase). User can set up time length of silence from a minimum of 32ms to a

maximum of 996ms in 32ms step when fOSC=4.096 MHz. These time lengths are directly

proportioned to the clock (fOSC) period.

11/22

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