GE Voluson 730Expert Service Manual page 157

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EALTHCARE RETZTECHNIK
D 105899, R
IRECTION EVISION
5-2-4 Data Flow Control Description
This section describes the functions of the Voluson® 730Expert Boards vs different Operation Modes.
• CPR - Beam former Board
• CRS - Mid-Processor, System Control and Spectral Doppler Board
• CKV - DMA Controller / Video Management Board
(CKV-Block diagram) see
5-2-4-1 B-Mode
1.) CRS
The CRS contains the Clock-Oszillator(60MHz) and PRF-Generator.
It generates(drives) BF(=Beamformer)-ASIC-Clock(60MHz) and Shot-Trigger for the CPR.
Configures CPU (Probe board) and Beamformer (CPD-Subboards on CPR) with TX-Frequ, TX-
Focus, RX-Focus, LineNo (lateral Position), TX- Apodisation, RX-Apodisation, Multibeam, etc.
CRS also contains the TX-Power-Reference-DAC.
Furthermore it contains Multibeam-DeInterleave, Subtraction Filter (for THI-Mode, see:
2-4-1-1 "Special B-Mode Techniques" on page
Demodulator), LowPassFilter, Decimation (Pixel rate Conversion), Magnitude Calculator (Part of
Demodulator), Logarithmic Amplifier, Re-Sample, Edge Enhance (Contrast Enhancement through
differentiation), LineFilter, Blending (adapting Brightness in order to perfectly combine Nearfield-
Frame with Farfield-Frame in FFC-Mode, see:
page
Multibeam-DeInterleave means: Incoming Pixel order
shot1pix1-shot2pix1-shot3pix1-shot4pix1 -
shot1pix2-shot2pix2-shot3pix2-shot4pix2...
is converted to the new order:
shot1pix1-shot1pix2-shot1pix3..... - shot2pix1-shot2pix2-shot2pix3.....
After DC-cancelling the signal is mixed with RX-Frequency and brought to LF-Spectrum, where the
LowPassFilter cuts HF. Mixer and Magnitude-Calculator arrange Complex Demodulation, and
Logarithmic Amplifier arrange the conversion from High-Dynamic LinearSignal to the Low-
Dynamik(e.g.8Bit) Log-Signal. Several Postprocessing steps (LineFilter, FrameFilter, ReSample,
Edge Enhance) enable smooth image quality while keeping contrast high.
2.) CPR
Contains 32 CPD (Beamformer-Subboards).
The CPD consists of Beamformer-ASIC, TX-Amplifier, RX-TGC-Amplifier, Signal-ADC.
Each CPD can support 8 TX-Channels and 4 RX-Channels.
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-
3.) CKV - Direct Memory Access (DMA) section
B-mode-Data from CRS is written via Signal Processor (SP) Channel 0 into SDRAM Fifo Buffer
memory. DMA Controller 0 transfers the data into PC main memory where scan conversion is
performed per software.
Cine Mode: Reserved area in PC main memory is used.
4.) CKV - Video section
The result is transferred to VGA memory via AGP bus. DVI (Digital Visual Interface) video output
signal is connected to CKV, where the analog VGA signals for the monitor and standard video
timing outputs are generated.
3 DRAFT (A
Figure 5-15 on page 5-28
5-12, FrameFilter.
TX-Channel: ASIC generates TX-Freq through dividing 60MHz by 2,3,4,5,... and TX-Focus.
RX-Channel: ASIC generates Sample-Clocks for the ADC, manages RX-Focus (Delay and
Chain-Adder) and Apodization.
Chapter 5 - Components and Functions (Theory)
29, 2008)
PRIL
5-12, DigitalTGC, DC-Canceler, Mixer (Part of
Section 5-2-4-1-1 "Special B-Mode Techniques" on
V ® 730E
OLUSON XPERT
S M
ERVICE
Section 5-
(BT03)
ANUAL
5-11