BK Radio GPH-CMD Service Manual

GPH-CMD VHF Radio Theory of Operation
BK RADIO Page 4-9
4.3.5 DIGITAL SIGNAL PROCESSING
Figure 4-6 Digital Signal Processing Block Diagram
A. Digital Signal Processor
The Digital Signal Processor implements filters, tone generators, and other signal processing
algorithms required for operation.
B. Flash Memory
The Flash Memory stores the Digital Signal Processor software.
C. CODEC
Converts analog signals to digital signals and vice versa.
D. TCXO
Provides a stable oscillator frequency for Digital Signal Processor.
E. Voltage Regulators
3.3 Volts is provided by a switching regulator. A linear regulator produces 1.5 Volts.
DSP
CODEC
FLASH
MEMORY
TO CORE
TCXO
19.6608 MHz
uP
LINEAR
1.8 V
REGULATOR
(1.4 MHz SW FREQ)
9.8304 MHz
CLK
DATA
DATA
SPEAKER
TX AUDIO
DISC
MIC
ADRS
DATA
COTROL
COTROL /
DATA BUS
AUDIO
1.8 V
3.3 V
A +
3.3 V
REGULATOR
SWITCHING
AUDIO
CONTROL
CONTROL /
DATA
BUS

BK Radio GPH-CMD Specifications

General

Brand	BK Radio
Model	GPH-CMD
Category	Portable Radio
Language	English