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MSM9802 bảng dữ liệu(PDF) 36 Page - OKI electronic componets

tên linh kiện MSM9802
Giải thích chi tiết về linh kiện  Voice Synthesis IC with Built-in Mask ROM
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MSM9802/03/05-xxx
¡ Semiconductor
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
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]
Bit rate [bps]
Memory capacity [bit]
Sampling frequency [Hz] ¥ 8 [bit]
Playback time [sec] =
=
(512–11) ¥ 1024 [bit]
8000 [Hz] ¥ 8 [bit]
Playback time =
= 8.0 [sec]
For example, if all phrases are stored in the MSM9802 at 8 kHz sampling frequency, the
maximum playback time is as follows.
Table 2.1 Maximum playback time
Playback method
Applicable sound
8-bit non-linear PCM algorithm Human voice
8-bit straight PCM algorithm
BEEP tone, sound effects
fSAM=16.0kHz
4.0
8.1
16.2
fSAM=8.0kHz
8.0
16.2
32.5
fSAM=6.4kHz
10.0
20.2
40.7
fSAM=4.0kHz
16.0
32.4
65.1
User's area
501K bit
1013K bit
2037K bit
ROM capacity
512K bit
1M bit
2M bit
Maximum playback time (sec)
Model
MSM9802
MSM9803
MSM9805



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