aP8910A APLUS [Aplus Intergrated Circuits], aP8910A Datasheet - Page 5

• Manufacturer Part Number: aP8910A
• Description: Standard CMOS process
• Manufacturer: APLUS [Aplus Intergrated Circuits]

VOICE SECTION COMBINATIONS
Voice files created by the PC base developing system are stored in the built-in EPROM of the
aP8921A/10A chip as a number of fixed length Voice Blocks. Voice Blocks are then selected and
grouped into Voice Groups for playback. Up to 12 Voice Groups are allowed. A Voice Block
Table is used to store the information of combinations of Voice Blocks and then group them
together to form Voice Group.
Example of Voice Block Combination
Assume here we have three voice files, they are “How are You?”, Sound Effect and Music. Each
of the voice file is divided into a number of fixed length Voice Block and stored into the memory.
Voice Blocks are grouped together using Voice Table to form Voice Group for playback:
Voice Data Compression
Voice File data is stored in the on-chip EPROM as either 4-bit ADPCM or 8-bit PCM format.
Voice data stored as 4-bit ADPCM provides 2:1 data compression which can save 50% of memory
space. On the other hand, voice data are stored as 8-bit PCM format means no data compression is
employed but voice playback quality will be better.
Ver 2.1
Chip
Memory size
Max no. of Voice Block
No. of bytes per Voice Block
Max. no. of Voice Group
No. of Voice Table entries
Voice Length (@ 6KHz 4-bit ADPCM)
Group no.
Group 1
Group 2
Group 3
Group 4
Voice File 1 - “How are You?” is stored in Voice Block B0 to B12.
Voice File 2 - Sound Effect is stored in Voice Block B13 to B15.
Voice File 3 - Music is Voice Block B16 to B40.
Integrated Circuits Inc.
Voice Group contents
“How are You?”
Sound Effect + “How are You?”
“How are You?” + Music
Music
5
aP8921A
512K bits
21 sec
126
512
960
12
Voice Table Entries
B0 … B12
B13 … B15 + B0 … B12
B0 … B12 + B16 … B40
B16 … B40
aP8921A/10A
256K bits
aP8910A
10 sec
126
256
960
12
Apr 3, 2007