SN56020
4-Channel Speech Controller
5.6. Auto repetition
Auto repetition function helps SN56000 series realize a “looping” sound automatically
by hardware without any software effort. Auto repetition function is a very useful
mechanism to implement “Sustain” sound in instrument synthesis. All 4 channels are
equipped with this function. Arbitrary lengths of looping sound are accepted by
SN56000 series.
5.7. Wave Mark
This is a new function for SN56000 series, it allows user to add a special mark in wave
data by the voice edit tool “CoolEdit”, ”Goldwav”, “SoundForge”. User can insert
event tags in anywhere of his wave file and can easy to get this special code to do his
special action during voice playing. That means, it should be easily to control the I/O
(such as LED or Motor) and other actions to synchronize with voice.
5.8. Push-Pull output
A Push-Pull Direct Drive circuit is built-in SN56020. The maximum resolution of
Push-Pull is 8 bits
(8 bit structure with LSB set to 0).
Two huge output stage circuits are
designed in SN56020. With this advanced circuit, the chip is capable of driving
speaker directly without external transistors.
5.9. Volume Control Function
Bit0~Bit2 of VOL Register is applied to control the volume of voice. The relationship
between output current and mode2 register is listed in the following table (power on set
to 111). Bit3 of VOL register provide for VOL Output division 2.
Bit2
0
0
0
0
1
1
1
1
Bit1
0
0
1
1
0
0
1
1
Bit0
0
1
0
1
0
1
0
1
Output Volume
46.5 DB
52.2 DB
58.1 DB
63.9 DB
70.3 DB
77.2 DB
82.3 DB
88.0 DB
Ver: 1.0
6
March 2,2005
SONIX [ SONIX TECHNOLOGY COMPANY ]
