Signal Processing; System Control - Canon PowerShot G2 Service Manual

2.2 Signal Processing

Drive Pulse
CCD
LENS
Sensor
Motor Driver
AF Support LED
FINDER LED
MIC
Electric FLASH

2.2.1 System Control

The CPU on the MAIN PCB ASS'Y controls the lens (motor, shutter), microphone input, operation switch
receiver, USB communication and flowing circuits.
• TG: Creation of the CCD drive pulse
• CDS, A/D: CCD signal processing and conversion of the digital data
• LCD Driver: Driving the LCD
• FLASH MEMORY: Firmware and adjustment data memory
• DSP: Picture processing
• RTC: Clock count for watch
• AF Support LED: AF auxiliary, self-timer and red-eye protection also serves as a lamp
• Electric Flash: Flash and charging circuit
MAIN PCB ASS'Y
SDRAM
HD, VD
CLK
TG
DSP
CDS, A/D
CPU
RTC
MIC Amp
Fig. 3 Signal System Block Diagram
2-3
CHAPTER 2. TECHNICAL DESCRIPTION
LCD
Driver
Video
Amp
FLASH MEMORY
Audio
Amp
BUZZER
CF card
LCD
AV OUT
USB
SPEAKER
SW
DIAL
KEY