5 - 24 HS70A Service Manual
Color Image Data Processing
RF Data generated by the BF Board is entered as FPGA Input.
The entered RF Data is converted into computable RF Data at the ASIC (MCB028A),
and then entered as the input for ASIC (MCB028A).
ASIC (MCB028A) receives RF Data input and processes through DTGC (Digital Time
Gain Compensation), Decimation, Quadrature mixer, etc. to create I/Q data (In-phase &
Quadrature Data). I/Q Data is entered into FPGA again.
I/Q data is processed at ASIC (MCB028A) to generate Color data and is sent to PC
Part. Detailed descriptions are as follows.
FPGA that receives I/Q data will send it to ASIC (MCB028A) to detect Color elements.
However, as Color elements include Wall (blood vessel wall) Noise, it is sent to FPGA
again for Rejection, Smooth Filter and Post filter processing. In these processes, Color
Data is completed and sent to DMA & RTC Part of the BE Board.
▐ Operational Principles of Analog Sound Part
The Analog Sound Part processes Doppler Sound and sends it to the speaker.
Doppler Sound is generated in the Doppler Part, and sent to the Analog Sound Part.
Doppler Sound goes through the Audio Digital Analog Converter process, because the
speaker only receives analog sound waves. Next, noise removal and Doppler Sound
amplification are performed before sending to the speaker.
▐ Operational principle of DMA & RTC Part (including FPGA
function)
DMA Part
DMA (Direct Memory Access) consists of FA (Frame Average), DMA and ECG In/Out Part.
FA (Frame Average) processes BW, Doppler, and Color Data by averaging the current
frame’s scan line data and the previous frame’s scan line data. DMA temporarily stores the
BW, Doppler, and Color Data that have been Frame Averaged, to send them through PCI
BUS when requested by the PC Part. It also stores ECG Data and sends it in the same
manner.
Since DMA uses the PC Part and the DMA Path for processing, it plays a very important role
in enhancing the performance of the product.
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