Defects associated with NTSC:

1. Monochrome and colour Defects
1. Due to Sampling
• Temporal Alias
• Vertical Alias
• Vertical Resolution Loss (Kell Factor)

2. Due to aperture
• Visible Scannig Lines
• oft Vertical Edges

3. Due to Interlace
• Twitter
• Line Crawl
• Vertical Resolution Loss (Interlace Coefficient)
• Motion Artifacts, Vertical and Horizontal

4. Due to Transmission
• Ghosts
• ICPM
• Group Delay
• Impulsive Noise
• Periodic Noise
• Random Noise
• Interference
• philtre Artifacts

5. Due to Changing Equipment
• Non-Linear System Gamma

2. colour Defects
1. Visible in Monochrome
• Cross Luminance
• Visible Subcarrier
• Chroma Crawl