GE Voluson E8 Service Manual page 197

GE H DRAFT
EALTHCARE
D KTD102576, R
IRECTION
5-2-3-3 D-Mode (Pulsed Wave- and Continuous Wave Doppler)
1.) RFI
-
-
a.) DMA section
2.) RTV - Video section
see:
5-2-3-4 D-Mode Autotrace (draws PC-calculated envelope to D-Spectrum)
(ECG-Curve is similar to Autotrace-Curve)
1.) RFI
-
-
-
a.) DMA section
2.) RTV - Video section
see:
7 DRAFT (A
EVISION
PRF-generator; see: 5-2-3-1 B-Mode
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.
D-mode-Data from RFI is written via SP0 into SDRAM Fifo Buffer memory. DMA Controller 1
transfers the data into PC main memory where FFT and scan conversion is performed per
software, i.e. the sweep image is generated (scaling and interpolation between lines).
CineMode: CineMode-Memory is the PC main memory.
CineMode with ECG: CineMode-Memory for the ECG-Curve is inside PC-Memory.
Software has to take care that D-Mode-Image and ECG-Curve are placed exactly one upon
the other, means: have the same Cine-Shift.
5-2-3-1 B-Mode
PRF-generator; see: 5-2-3-1 B-Mode
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.
D-Mode Data use the dedicated 16-bit Bus SP0 to the RTV.
D-mode-Data from RFI is written via SP0 into SDRAM Fifo Buffer memory.
PC calculates Autotrace-Curve from D-Mode data.
Cine Mode with Autotrace/ECG: Cine Mode-Memory for the Autotrace/ECG-Curve is inside
PC-Memory.
Software has to take care that D-Spectrum and Autotrace/ECG-Curve are placed exactly one
upon the other, means: have the same Cine-Shift.
5-2-3-1 B-Mode
Chapter 5 - Components and Functions (Theory)
23, 2012)
UGUST
V E8 / V
OLUSON OLUSON
S M
ERVICE ANUAL
5-13
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