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Radiant DVMD1 Bedienungsanleitung Seite 7

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Frequency Response of Video Generator and Video Decoder (Luma)
This graph shows the A/D values from a video generator producing high frequency vertical bars. The
video was captured with an ADV1783B video decoder in CCIR656 NTSC mode. Each CCIR video line
contains 720 pixels. The data clearly shows the effects on luma of the notch filter at 3.58MHZ (NTSC).
This provides chroma separation with the digital filters in the decoder. The chirp goes up to about 5 MHZ.
Video Generator Low to
High Frequency Luma Bars
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1 15 29 43 57 71 85 99 113 127 141 155 169 183 197 211 225 239 253 267 281 295 309 323 337 351 365 379 393 407 421 435 449 463 477 491 505 519 533 547 561 575 589 603 617 631 645 659 673 687 701 715
Luma Level
Series 2
Frequency Response of Video Processor in Series with Video Generator (Luma)
This graph shows a slight high-frequency degradation of A/D values AFTER going through one 3.3V
Video Processor on a DVMD1 mounting card. The video was captured with the same ADV1783B video
decoder in CCIR656 NTSC mode. There is a slight processing delay in the Video Processor analog path
due to AGC, Overlay Mux, and Buffer Amp, however it is less than one sample time at 27MHZ. There is
no degradation in the low frequency response. The 3.58MHZ notch is still quite clear. The high
frequency response is phase shifted and slightly reduced over the original data sampled previously. It is
hard to see degradation with an oscilloscope at 5MHZ but there is some.
3.3V Module In Series
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1 15 29 43 57 71 85 99 113 127 141 155 169 183 197 211 225 239 253 267 281 295 309 323 337 351 365 379 393 407 421 435 449 463 477 491 505 519 533 547 561 575 589 603 617 631 645 659 673 687 701 715
Sample Number
Luma Value
Series1
2395 Kenwood Drive Boulder CO 80305 (303) 543-0440
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