FEDL2240DIGEST-02

OKI Semiconductor

ML2240 Family

18/24

Playback Time and Memory Capacity

The playback time depends upon the memory capacity, sampling frequency, and playback method.

The equation showing the relationship is given below.

Playback time [sec] =

(Bit length is ADPCM, ADPCM 2 = 4 bits; PCM = 8 bits.)

Example: Let the sampling frequency be 16 kHz and 4-bit ADPCM algorithm. If one 8 Mbits ROM is used, then

the playback time is obtained as follows:

Playback time =

≅ 131 (sec)

The above equation gives the playback time when the phrase control table function is not used.

1.024

× (Memory capacity – 16) (Kbit)

Sampling frequency (kHz)

× Bit length

1.024

× (8192 – 16) (Kbit)

16 (kHz)

× 4 (bit)