| 1_ |
NTSC:
Introduction |
| 2_ |
Scanning, Timing/Sync, Sync
Recovery, Numbers |
| 3_ |
Gain
& Offset, D.C. Restoration, Gamma Correction |
| 4_ |
Resolution,
Bandwidth, Spectrum |
| 5_ |
Color
Physics: Eye, CIE |
| 6_ |
Color
Encoding: Color Bars, Camera,
RGB,
YIQ, Color Subcarrier |
| 7_ |
Color
Decoding: |
| 8_ |
Digital
TV/Graphics: ADC-DAC, Frame Buffers, Timebase Correction, VGA |
| 9_ |
VCR:
Spectrum, Circuits |
| 10_ |
Circuits
& Practices: D.C. Restore, Proc Amps, DAs |
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Cathode Ray Tube (CRT)
Showing Electro- static & Electro- magnetic Deflection. Note that Electro-magnetic
deflection coil's influence is 90 from its axis.
Electro-static is Fast; CRTs are Large & expensive. |
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Raster Scan Deflection Waveforms
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| Figure shows Horizontal & Vertical Sweep Voltage Waveforms, and
their relative timing Relationships. |
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Interlace Raster Scan
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| Illustration of scanning beam on CRT face during Interlace scan. |
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Interlaced Scan
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| Illustration of how Interlacing is accompolished. |
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Raster Scan Synchronization Waveforms
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NTSC/RS-170A, complete set of waveforms, including Composite Blanking.
Note Color Subcarrier phasing (in red). |
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Horizontal Sync Complex
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Illustrating "Front Porch," "Sync Tip," "Back Porch" with Color Burst
riding on it.
The interval between the end of the sync tip & the start of the
burst is sometimes refered to as the "Breeze -way." Note also, the "Burst
Flag" (D.C. Restore clamp). |
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Vertical Sync Recovery
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| Vertical sync recovery by Integration of composite sync waveform. |
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So-called "Hammerhead" waveform
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| Normally invisible waveform of the "Vertical Interval," showing the
relationship of the Horizontal sync Pulses; Pre-Equalization Pulses; Serration
Pulses; Post-Equalization Pulses; Color Burst, etc. |
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Sync Seperator
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| Circuit for the recovery of both, Horizontal Sync & Vertical Sync,
as well as, Even/Odd Field Flag. |
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Sync Seperator
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| Sync Separator with "Noise" pulse suppression--used in terrestrial
receivers & VTR/VCRs. |
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Horizontal Deflection
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| Horizontal deflection circuit, showing Drive transistor, Damper diode,
Deflection Coil, Resonating & linearizing Capacitors; with High Voltage
Fly-back transformer (tuned to third harmonic of scanning frequency). |
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Horiz Deflection Sequence
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| "L" & "C" Charge Discharge sequencing related to horizontal scan
beam position. |
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Broadcast Spectrum Shaping
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NTSC Broadcast signal uses Vestigial SideBand (VSB) transmission, with
properly bandlimited "I" & "Q" chroma information.
Note also, the aural carrier @ 4.5 MHz. In practice, this is inserted
as a highlevel aural transmitter output at the transmitting antenna. |
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Television-For-EEs
Television
Technology for Engineers, Technicians & Hobbyists
| Television
encompasses more subject areas than any other single technology. You learn
switching power supplies, perception, wireless communications, ergonomics,
physics: --the list is endless... |
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| Electro-magnetic is Slow; CRTs are small & inexpensive. Almost
ALL Image displays use Electro-magnetic deflection! |
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Interlaced Scan Color Display
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In NTSC Television Broadcast signals, the Video
information is Amplitude Modulation (AM); the Aural information is Frequency
Modulation (FM). |
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