VITS201

Analog Generator
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Features & Benefits

  • Digital Composite Signal Generation
  • CCIR, EBU, UK National ITS
  • Operates in the Presence of Sound in Syncs
  • Four External ITS Inputs
  • Source Identification
  • Program Line Sync and Burst Regeneration
  • Loss of Program Input Modes:
    • External Input to Program Out
    • Internal Generator to Program Out
    • Program Line Bypass
  • User Programmable Text Generator Provides:
    • Message in Program Line Vertical Interval
    • Message in Active Picture Area for Loss of Program Input Modes
  • User Programs for:
    • Insertion of Internal, External, and Source Identification Signals
    • Loss of Program Input Modes Text Insertion
  • All User Program Settings Saved in Nonvolatile Storage
  • Monitor Output
  • Remote Control

Applications

  • VITS Insertion for Broadcast Video Applications

The VITS201 is a low cost, high quality ITS generator and inserter/deleter with features found only in the most expensive transmission grade ITS inserters. In addition to a solid basic generator/inserter unit, the VITS201 provides loss of program continuity modes, multiple inputs for external data insertion, source identification, a text generator for message insertion and a versatile programmer with nonvolatile memory storage for setting up the unit's operation and loss of program modes.

Test Signal Generator

The VITS201 uses digital signal generation and a precision 12-Bit DAC to ensure signal accuracy and long term stability. Digital generation of the composite signal with conversion to analog using a single DAC ensures accurate chrominance-to-luminance gain and timing. The VITS201 generates the following signals:

  • CClR 17, 18, 330 and 331
  • U.K. National
  • GCR
  • 75% color bars
  • Sin (x)/x
  • Luminance ramp
  • 0% and 100% luminance levels
Inserter/Deleter Functions

The VITS201 may be programmed to insert any internally generated signal, external input, or the source identification signal on any line from 7 through 30 and 319 through 343. If desired, the same signal or external input may be programmed for insertion on multiple lines. This may be useful in insertion of teletext and other data signals.

Four external ITS inputs are provided for insertion of externally generated test and data signals. All inputs are AC coupled and clamped. The VITS201 assumes the external input signals are locked to the program signal and correctly timed.

Delete and pass functions are available for the same lines as the insert function.

Program Channel

Maintaining transparency and continuity of the program channel is a prime consideration in the VITS201. Distortions and transients are virtually eliminated by the Tektronix developed channel switch integrated circuit. Insertion or deletion of ITS can occur only when genlock to the program input signal is attained. Loss of mains power or genlock causes the program line to be bypassed. Program signal delay in operate and bypass is matched.

The VITS201 provides for replacement of the program line sync and burst signals with the internally generated sync and burst signals. This ensures the proper amplitude relationship of the inserted ITS to the sync and burst signals is established prior to inputting the signal to the broadcast transmitter or transmission system. Timing of the active video to the blanking interval is not affected in the sync and burst regeneration mode.

Loss of the program input signal will automatically enable one of three program line output states:

  • Program line bypassed
  • A user selected external input will be routed to the program line output
  • A user selected internally generated signal will be routed to the program line output

When an internally generated signal is selected, a message may be superimposed over the active picture area. The message is generated by the VITS201 text generator. Restoration of the program line input signal will terminate the program line continuity action and resume normal operation.

Source Identification

The VITS201 provides a one line 16-Bit source identification code. The bits may be set in any high/low sequence providing up to 65,536 possible codes. Setting of the code is done with DIP switches accessible through the rear panel. The identification signal may be placed on any of the available lines in vertical blanking. The VM700T Video Measurement Set utilizes this signal for identification of sources on displays and printouts of measurement routines.

Text Generator

Should the program input line be interrupted, text may be inserted over the internally generated signal selected as the temporary program line replacement. The VITS201 internal text generator provides up to four pages of text with a maximum of fifteen lines per page. Text insertion of a single line of 26 characters in vertical blanking is available in the normal operating mode. Remote control of page select, page text on/off and vertical interval text on/off are provided.

The text generator font set consists of 80 characters and symbols, each a 32x32 pixel array.

Remote Control

Ground closure remote control of the following functions is provided:

  • Bypass/operate
  • Full field text page select
  • Full field text on/off
  • Vertical interval text on/off
  • Forced standby

Indicator lines for program line bypass, power on and genlock to program lines are provided.

Characteristics

Program Channel

Gain - Unity ±1%.

Frequency Response - ±1% to 5.5 MHz.

Chrominance-to-luminance Gain - ±0.5%.

Chrominance-to-luminance Delay - ≤2 ns.

Group Delay - ≤2 ns to 5 MHz.

Differential Phase - ≤0.2°.

Differential Gain - ≤0.2%.

Tilt - <0.5%.

DC Matching of Program Video to Inserted Signal - ±3 mV.

Phase Matching of Program Video to Inserted Signal - Within 1° at subcarrier; signal-to-noise ratio of 45 dB or greater.

Phase Matching of Relay Bypass Path to Signal Processing Path - Within 3° at subcarrier.

Crosstalk - ≥60 dB down.

Switching Transients - ≤2 mV.

DC Output Level - 0 V DC ±10 mV.

Input Impedance - 75 Ohm.

Return Loss - 36 dB to 5 MHz.

Thumbnail

Vertical interval text.

Thumbnail

Full field text.

External Inputs

Gain - Unity ±1%.

Frequency Response - ±1% to 5.5 MHz.

Chrominance-to-luminance Gain - ±0.5%.

Chrominance-to-luminance Delay - ≤5 ns.

Group Delay - ≤2 ns to 5 MHz.

Differential Phase - ≤0.2°.

Differential Gain - ≤0.2%.

Tilt - <0.5%.

DC Output Level - 0 V DC ±10 mV.

DC Matching of Program Video to Inserted Signal - ±10 mV; AC coupled and clamped.

Crosstalk - ≥60 dB down.

Switching Transients - ≤2 mV.

Input Impedance - 75 Ohm.

Return Loss - 36 dB to 5 MHz.

Test Signal Generator

Luminance Amplitude Accuracy - ±1%.

Frequency Response - ±1% to 5.5 MHz.

Chrominance-to-luminance Gain - ±0.5%.

Chrominance-to-luminance Delay - ≤5 ns.

Group Delay - 5 ns to 5 MHz.

Differential Gain - ≤0.3%.

Differential Phase - ≤0.3°.

Tilt - ≤0.5%.

Output Impedance - 75 Ohm.

Return Loss - 36 dB to 5 MHz.

Environmental

Temperature - Operating: 0° C to +50° C.

Nonoperating: -40° C to +65° C.

Certifications

EMC - Certified to the EMC Directive 89/336/EEC.

Safety - Approved to: UL1244, CSA231.

Complies with: EN61010-1, IEC61010-1.

Physical Characteristics

Dimensions

mm

in.

Weight

kg

lbs.

Height

44

1.734

Width

483

19

Length

467

18.4

Net

4.8

10.5

Shipping

10.2

22.5

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