Larson Davis 824 - Page 35

9/29/09 Introduction 1-15
mic
Preamplifier
0-50 dB gain
Flat, A-Wt, C-Wt or 10 Hz High Pass Flat, A-Wt, C-Wt
or 10 Hz High Pass
Analog to Digital Converter
Digital Signal Processor
AC/DC out
Mux
Frequency Detection
Analog to Digital Converter
External Power
Battery
Temperature
Sensor
Power Supply
Control I/O
Microprocessor
RAM
1/2 to 2 MB
Flash ROM
Real-time clock
and calendar
Serial I/O
Key Pad
Graphic Liquid Crystal Display (LCD) 128x64 with backlight
RS-422/232 transceiver
DC out
AC out
AC out
0-50 dB gain
824 System diagram
Serial I/O
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Figure 1-6 System Diagram