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ADV7300A Datasheet(PDF) 47 Page - Analog Devices |
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ADV7300A Datasheet(HTML) 47 Page - Analog Devices |
47 / 68 page REV. A ADV7300A/ADV7301A –47– Table XXI. Adaptive Filter Control on Step Input Signal Address Register Setting 00h FCh 01h 38h 02h 20h 10h 00h 11h 81h 15h 80h 20h 00h 38h ACh 39h 9Ah 3Ah 88h 3Bh 28h 3Ch 3Fh 3Dh 64h All other register settings are 00h. When changing the Adaptive Filter Mode to Mode B [Address 15h, Bit 6], the output in Figure 67 can be obtained. : 674mV @: 446mV : 332ns @: 12.8ms Figure 67. Output Signal from Adaptive Filter Control The adaptive filter control can also be demonstrated using the internally generated crosshatch test pattern and toggling the Adap- tive Filter Control Bit [Address 15h, Bit 7], shown in Table XXII. Table XXII. Adaptive Filter Control on Internal Test Pattern Address Register Setting 00h FCh 01h 38h 02h 20h 10h 00h 11h 85h 15h 80h 20h 00h 38h ACh 39h 9Ah 3Ah 88h 3Bh 28h 3Ch 3Fh 3Dh 64h SD DIGITAL NOISE REDUCTION [Subaddresses 63h, 64h, and 65h] DNR is applied to the Y data only. A filter block selects the high frequency, low amplitude components of the incoming signal (DNR input select). The absolute value of the filter output is compared to a programmable threshold value (DNR threshold control). There are two DNR modes available: DNR Mode and DNR Sharpness Mode. In DNR Mode, if the absolute value of the filter output is smaller than the threshold, it is assumed to be noise. A programmable amount (coring gain border, coring gain data) of this noise signal will be subtracted from the original signal. In DNR Sharpness Mode, if the absolute value of the filter output is less than the programmed threshold, it is assumed to be noise, as before. Otherwise, if the level exceeds the threshold, now being identified as a valid signal, a fraction of the signal (coring gain border, coring gain data) will be added to the origi- nal signal in order to boost high frequency components and to sharpen the video image. In MPEG systems, it is common to process the video information in blocks of 8 8 pixels for MPEG2 systems or 16 16 pixels for MPEG1 systems (block size control). DNR can be applied to the resulting block transition areas that are known to contain noise. Generally, the block transition area contains two pixels. It is pos- sible to define this area to contain four pixels (border area.) It is also possible to compensate for variable block positioning or differences in YCrCb pixel timing with the use of the (DNR block offset.) BLOCK SIZE CONTROL BORDER AREA BLOCK OFFSET CORING GAIN DATA CORING GAIN BORDER GAIN DNR CONTROL FILTER OUTPUT > THRESHOLD ? INPUT FILTER BLOCK FILTER OUTPUT < THRESHOLD DNR OUT MAIN SIGNAL PATH ADD SIGNAL ABOVE THRESHOLD RANGE FROM ORIGINAL SIGNAL DNR SHARPNESS MODE NOISE SIGNAL PATH Y DATA INPUT BLOCK SIZE CONTROL BORDER AREA BLOCK OFFSET CORING GAIN DATA CORING GAIN BORDER GAIN DNR CONTROL FILTER OUTPUT < THRESHOLD ? INPUT FILTER BLOCK FILTER OUTPUT > THRESHOLD DNR OUT MAIN SIGNAL PATH SUBTRACT SIGNAL IN THRESHOLD RANGE FROM ORIGINAL SIGNAL DNR MODE NOISE SIGNAL PATH Y DATA INPUT Figure 68. DNR Block Diagram |
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