GE M
EDICAL
S
YSTEMS
- K
RETZTECHNIK
U
LTRASOUND
D
IRECTION
105844, R
EVISION
1
V
OLUSON
® 730 S
ERVICE
M
ANUAL
5-22
Section 5-4 - Front End Processor
5-4-1
Front End - Board Descriptions
(cont’d)
5-4-1-5
CPG - MID-Processor Board
A.) For B,C,D modes:
-
Multi Beam-DeInterleave
-
Subtraction Filter (for THI)
-
Digital TGC, DC-Cancelling
-
Mixer with NCO
-
FIR-Low Pass
B.) For B mode only:
-
Magnitude Calculator
-
Logarithmic Amplifier
-
Resample
-
Edge Enhance
-
Line Filter
-
Blending
-
Frame Filter
5-4-1-6
CPC - Control Board
•
Clock Oscillator (60MHz)
•
PRF (Pulse Repetition Frequency) Generator
•
Beamformer Configuration:
•
Tx (transmitting Frequency, TxRx (transmitting/receiving) Focus timing
•
TxRx (transmitting/receiving) Apodisation
•
Line number (lateral Position)
•
contains TX-Power-DAC
5-4-1-7
CPF - CFM Board
A.) CFM-processing:
-
Sample rate Conversion
-
Auto-Correlator
-
Wall motion filter (WMF)
-
Velocity-, Turbulence-, Power-Calculation
-
Persistence Filter (Smooth)
-
Axial-, Lateral-Filter
-
Thresholding
-
Line buffer for Transfer to CPS
B.) Doppler-Processing:
-
DSP, Audio DAC
C.) Beamformer- Configuration-Data:
-
"EH_DATA"(16)
-
"EH_ADR"(8)
-
B-Mode-Data