Canon PowerShot G5 Service Manual - Page 41
Signal Processing, System Control - firmware
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CHAPTER 2. TECHNICAL DESCRIPTION 2.2 Signal Processing MAIN PCB ASS'Y LENS Drive Pulse CCD Sensor SDRAM HD, VD CLK TG CDS, A/D DSP Motor Driver AF Support LED FINDER LED LCD Driver Video Amp FLASH MEMORY MIC Electric FLASH RTC MIC Amp CPU Audio Amp BUZZER CF card LCD AV OUT USB SPEAKER SW DIAL KEY Fig. 3 Signal System Block Diagram 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 2-3
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