msm9802 Oki Semiconductor, msm9802 Datasheet - Page 36

• Manufacturer Part Number: msm9802
• Description: Voice Synthesis Ic With Built-in Mask Rom
• Manufacturer: Oki Semiconductor

The playback time is obtained by dividing the memory capacity by the bit rate.
The playback time for 8-bit PCM algorithm is obtained by using the following equation.
For example, if all phrases are stored in the MSM9802 at 8 kHz sampling frequency, the maximum playback time
is as follows.
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 recommended to evaluate the sound quality before actual use.
OKI Semiconductor
MSM9802
MSM9803
MSM9805
8-bit non-linear PCM algorithm
8-bit straight PCM algorithm
Model
Playback time [sec] =
Playback time =
Table 3.1 Relationship between playback methods and applicable sounds
ROM capacity
512K bit
1M bit
2M bit
Playback method
User's area
(512–11) × 1024 [bit]
1013K bit
2037K bit
501K bit
8000 [Hz] × 8 [bit]
Memory capacity [bit]
Table 2.1 Maximum playback time
Bit rate [bps]
f
SAM
= 4.0 kHz
16.0
32.4
65.1
Human voice
BEEP tone, sound effects
≅ 8.0 [sec]
f
=
SAM
Maximum playback time (sec)
= 6.4 kHz
10.0
20.2
40.7
Sampling frequency [Hz] × 8 [bit]
Memory capacity [bit]
Applicable sound
f
SAM
= 8.0 kHz
16.2
32.5
8.0
MSM9802/03/05-xxx
FEDL9802-03-05-05
f
SAM
= 16.0 kHz
16.2
4.0
8.1
36/53