FEDL22594-06
ML22594-XXX
25/73
Voice control area
(Fixed 64Kbits)
Voice control area
(Fixed 64Kbits)
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(512phrases for internal ROM, 512phases for external ROM), 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.
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.
Example: Let the sampling frequency be 16 kHz and HQ-ADPCM algorithm. Then the playback time is
approx. 121 seconds, as shown below.
1.024
×
(6144
−
64) (Kbits)
16 (kHz)
×
3.2 (bits) (average)
Playback time =
≅
121 (sec)
1.024
×
(Memory capacity
−
64) (Kbits)
Sampling frequency (kHz)
×
Bit length
Playback time =
(sec)
Test area
Edit ROM area
Depends on creation of ROM
data
0x00000
0x01FFF
0x02000
0xBFFFF
0x0206F
0x02070
Filter area
Configuration of Internal ROM data(6Mbit)
0x000000
0x001FFF
0xFFFFFF
Configuration of External ROM data(128Mbit)
Edit ROM area
Depends on creation of ROM
data
0x021AF
Voice area
0x021B0
Test area
0x002000
0x00206F
0x002070
Filter area
0x0021AF
0x0021B0
Voice area