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Zakładka z wyszukiwarką danych komponentów |
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Zakładka z wyszukiwarką danych komponentów |
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MSM9802 Arkusz danych(PDF) 36 Page - OKI electronic componets |
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MSM9802 Arkusz danych(HTML) 36 Page - OKI electronic componets |
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36 / 52 page  36/51 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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