ML22Q573 datasheet(22/69 Pages) ETC2

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FEDL22Q553-02

ML22Q553

Memory Allocation and Creating Voice Data

The ROM is partitioned into four data areas: voice (i.e., phrase) control area, test area, voice area, and edit ROM

area.

The voice control area manages the ROM’s voice data.

It contains data for controlling the start/stop addresses

of voice data for 1024 phrases, use/non-use of the edit ROM function and so on.

The test area contains data for testing.

The voice area contains actual waveform data.

The edit ROM area contains data for effective use of voice data.

For the details, refer to the section on “Edit

ROM Function.”

No edit ROM area is available unless the edit ROM is used.

The ROM data is created using a dedicated tool.

Configuration of ROM data

Voice control area

(Fixed 64 Kbits)

Test area

Edit ROM area

Depends on creation

of ROM data.

0x00000

0x01FFF

0x7FEC0

max: 0x7FEBF

Filter area

max: 0x7FFFF

0x02000

max: 0x7FEBF

Voice area

0x02070

0x0206F

Playback Time and Memory Capacity

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

The equation showing the relationship is given below.

The equation below gives the playback time when the edit ROM function is not used.

1.024

× (Memory capacity − 64) (Kbits)

Sampling frequency (kHz)

× Bit length

Playback time =

(sec)

Example: Let the sampling frequency be 16 kHz and HQ-ADPCM algorithm.

Then the playback time is

approx. 80 seconds, as shown below.

1.024

× (4096 − 64) (Kbits)

16 (kHz)

× 3.2 (bits) (average)

Playback time =

≅ 80 (sec)

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