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Two algorithms that are suitable for deriving the blanking level of a National Television Systems Committee (NTSC) composite video signal are described. One method consists of averaging digitized color-burst samples taken from successive scan lines. A second method involves processing a group of samples taken from a single burst interval. Either algorithm used in a hybrid clamping arrangement results in automatic drift compensation and the ability to tie the back porch or sync tip to a predetermined digital output code. This aids in matching the analog signal to the input of the analog-to-signal (A/D) converter for maximum signal-to-noise ratio (SNR). In analyzing the effect of additive noise and timing jitter, it was found that both algorithms are, generally, more vulnerable than a conventional keyed clamper.
- ADC,
- NTSC,
- National Television Systems Committee,
- SNR,
- Algorithms,
- Analog Signal,
- Automatic Drift Compensation,
- Blanking Level,
- Color Television,
- Composite Video Signal,
- Digital Codecs,
- Digital Color Burst Samples,
- Digital Output Code,
- Digital Processing,
- Digital Video Equipment,
- Hybrid Clamping,
- Signal-To-Noise Ratio,
- Video Equipment,
- Video Signals
Available at: http://works.bepress.com/norman-cox/3/