MSM9836-XXX Ver la hoja de datos (PDF) - Oki Electric Industry

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MSM9836-XXX

Voice Synthesis IC with Built-in Mask ROM

Oki Electric Industry 

¡ Semiconductor

MSM9836-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 MSM9836 at 8 kHz sampling frequency, the

maximum playback time is as follows.

(3072–17) ¥ 1024 [bit]

Playback time =

= 48.8 [sec]

8000 [Hz] ¥ 8 [bit]

Table 2.1 Maximum playback time

Model

MSM9836

ROM capacity User's area

3M bit

3055K bit

Maximum playback time (sec)

fSAM=4.0kHz fSAM=6.4kHz fSAM=8.0kHz fSAM=16.0kHz

97.7

61.0

48.8

24.4

3. Playback Method

This IC provides two kinds of playback methods, non-linear PCM algorithm and straight PCM

algorithm. When the 8-bit non-linear PCM algorithm is selected, sound quality can be improved

because a resolution equivalent to 10-bit straight PCM is available around the waveform center.

You can select either non-linear PCM algorithm or straight PCM algorithm for each phrase. Table

3.1 shows the relationship between playback methods and applicable sounds. It is recom-

mended to evaluate the sound quality before actual use.

Table 3.1 Relationship between playback methods and applicable sounds

Playback method

Applicable sound

8-bit non-linear PCM algorithm Human voice

8-bit straight PCM algorithm BEEP tone, sound effects

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