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7034722 |
ADC calibration to accommodate temperature variation using vertical blanking interrupts
In digital display circuitry, configured to display an image encoded in an analog display signal, the digital display circuitry includes analog-to-digital converter (ADC) circuitry to recover pixel...
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6734898 |
Methods and apparatus for the measurement of video quality
The present invention relates to methods and apparatus for measuring the quality of video (e.g., television) signals. In particular, the methods and apparatus of the present invention allow for the...
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6337711 |
Transmission performance testing
Performance testing of transmission signals to ensure quality and compliance with governmental regulations by limiting interference with intended signals, such as entertainment signals seen by...
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5635105 |
Liquid crystal display and optical compensatory sheet and process for preparation of the same
Disclosed are a liquid crystal display provided with an optical compensatory sheet comprising an optically anisotropic layer which has negative birefringence and comprises a polymer having a...
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5614944 |
Test method and apparatus of sequentially executing synchronous signal test, dot level test, and gradation test of a video signal generator
In a video signal test, a sync signal test is first performed in which specification items of sync signals are measured. If the result is good, then a dot level test is performed using a dot...
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5402172 |
Image signal processing device having phase reference signal adding function
An image signal processing device for processing an image signal is arranged to temporarily store the image signal inputted and a reference signal generated, and, after that, to read out the...
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5353117 |
Vertical interval test signal for detecting video system low-level luminance linearity and differential gain and phase errors
A test signal for enabling control of picture fidelity in a distribution system for distributing a video signal that has a vertical interval including a number of lines. The test signal comprises...
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4891700 |
System for inserting a test signal in a video image scanning line
A television receiver includes a source of test signals for controlling parameters such as picture tube cut-off level and drive level. The test signals are inserted individually during visible...
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4729011 |
Method and apparatus for digitizing television signals
An arrangement for digitizing television signals, particularly the staircase portion of the vertical interval test signal transmitted by the British Broadcasting Corporation and the Independent...
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4700227 |
Circuit for producing a video signal representing a measuring signal
A circuit for producing a video signal representing a measuring signal is already known, said circuit comprising a video storage circuit, a horizontal address control circuit for controlling said...
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4670782 |
Television video pattern generator system
A television video pattern generator system comprises a keyboard for entering pulse width and timing parameters for a video scanning rate. The individual incremental pulse width and timing...
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4518995 |
Selectable rate sync generator system
A selectable rate sync generator system for use with a television test pattern generator includes a master oscillator of predetermined frequency, selector switches for selecting the desired total...
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4495519 |
Test pattern generators
A test pattern generator comprises vertical line pulse generating circuit (20) for generating a first pulse train (VL) and a second pulse train (Hi), the first pulse train being used to display...
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4466014 |
Video test method and apparatus with incremental scan rate capability
A video test pattern generator is able to be incrementally adjusted in its number of lines and in its line resolution, and at the same time is able to produce a reference frequency. The reference...
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4414567 |
Pattern generating circuit
A pattern generating circuit is disclosed for providing a fixed test pattern to be broadcast on a video display system such that an individual may test or repair the aforementioned video display...
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3972065 |
Method of testing color television systems
A method of testing both digital and analog color television systems is disclosed. The method includes the generation of a unique test signal enables the measurement of differential-phase and...
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3879749 |
TV test pattern and method of testing
A test pattern generator electronically generates a wave form comprising a plurality of equal amplitude, discrete video frequencies at strategic points on the I.F. response curve, which frequencies...
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3659044 |
TEST SYSTEM FOR ELECTRICAL APPARATUS
A test waveform which consists of n separate test signals during n successive time intervals, respectively, is applied to one or more units under test. The response of a unit to a particular one of...
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3590149 |
TELEVISION TEST INSTRUMENT
Television test instrument for developing test patterns by modulating the lines of a television raster, particularly for creating dot and bar patterns in which multivibrators are provided for...
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3582544 |
TEST SIGNAL GENERATOR FOR PRODUCING TEST PATTERNS FOR A TELEVISION RECEIVER
Test signal-generating apparatus for producing test patterns for a television receiver. Pulse trains are produced at integral multiples of television horizontal and vertical scanning rates and are...
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3576390 |
APPARATUS FOR GENERATING TEST SIGNALS USEFUL IN MEASURING TELEVISION TRANSMISSION PERFORMANCE WITHOUT AFFECTING RECEIVER SYNCHRONIZATION
Apparatus for generating supervisory test signals in the interval between the beginning of vertical blanking and the beginning of vertical sync in a television synchronizing waveform, so as to free...
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3179744 |
Television test signal generator
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3027420 |
Television pattern generators
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2956116 |
Testing circuit
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2858368 |
Color television test apparatus
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