A color television receiver includes a comb filter (10) having luminance and chrominance outputs coupled to respective inputs of a display processor (12) A signal source (22,30) provides composite and non-composite color video signals for display A switching circuit (40, 50, 60) having a first operating mode for coupling the composite video signal to an input of the comb filter for enabling display thereof by said display processor The switching circuit has a second operating mode for coupling the luminance component of the non-composite video signal to the input of the comb filter and for concurrently coupling the chrominance component of the non-composite video signal to the chrominance output of the comb filter for facilitating display of the non-composite video signal by said display processor

Television receiver with auxiliary input connector for video signals of a separated y-c format

In a graphics card of a computer, a circuit is provided for displaying graphic presentations generated by the card on an external TV set. A TV adapter controls a horizontal state machine of a CRT controller so as to delay generation of CRT timing signals by a time period variable with horizontal lines. As a result, a composite video signal is provided with a time-base variable front porch to simulate VTR video signals. In response to the generated composite video signal, the TV set switches into a VTR mode to disable a comb filter used for separating luminance and chrominance components of a broadcast television signal.

System for displaying computer generated images on a television set

A video signal input selector is subject to cross coupling between selectable video signals. The input selector comprises a video amplifier coupled to amplify a video signal selected from said selectable video signals. A controllable switch has first and second elements, the first element receives the selected video and is coupled to signal ground. The second element receives the selected video and is coupled to the amplifier. During a first condition the first element is controlled to be open circuit and the second element is controlled to be short circuit coupling the selected video signal to the video amplifier. In a second condition the first element is controlled to short circuit the selected video signal to the signal ground and the second element is controlled to be open circuit substantially inhibiting the selected video signal from coupling to the video amplifier.

Crosstalk reduction in a video signal selector

Display apparatus includes a kinescope cathode current
sensor (18) coupled to a load (200) for developing a beam current
measurement pulse during a beam current measurement interval.
Overshoots in the pulses are suppressed by a pulse correction circuit
(300).

Apparatus for suppressing overshoots in kinescope beam current measurement pulses

A video signal recording system is provided in which the number of horizontal scanning lines of a high-definition television system video signal is converted to be M times as large as the number of horizontal scanning lines of an ordinary television video signal. The converted video signal is divided into M vertical sections and N horizontal sections so that M×N sections of the divided video signal are separately recorded onto M×N recording media respectively. In this way, a high-definition television system video signal can be displayed on a plurality of ordinary television receivers without losing the high-definition television system picture quality.

Display circuit for displaying an HDTV signal as twelve NTSC signals and for displaying an independent NTSC signal

A television receiver responsive to broadcast television signals in a normal operating mode includes a video channel with high frequency peaking circuits, followed by a wideband display driver to which auxiliary R, G, B color image signals are applied in an auxiliary operating mode of the receiver. A low pass filter restricts the high frequency response of the video channel in the normal mode so that the combination of the high frequency peaking circuits and the wideband display driver does not result in a condition of excessive signal bandwidth and attendant unwanted spurious high frequency signal effects.

Plural input television receiver having peaking circuit and chrominance band reject filter in a video signal channel

A television receiver responsive to a broadcast television signal in a normal operating mode includes a television signal channel with high frequency peaking circuits, followed by a display driver to which an auxiliary video signal may be applied. A low pass filter is connected between the output of the television signal channel and the display driver, which exhibits a wide bandwidth when the receiver is intended to display auxiliary video information. The bandwidth of the low pass filter is inversely related to the bandwidth of the driver such that the low pass filter exhibits a narrow bandwidth relative to the bandwidth of a wideband display driver. In addition, the low pass filter exhibits a trapping characteristic at the second harmonic frequency of the chrominance signal in a color television receiver.

Television receiver with display driver amplifier and input video filter having inversely related bandwidths

A kinescope driver stage in a television receiver includes an input pre-driver transistor and an output driver transistor arranged in a cascode amplifier configuration. To enhance the high frequency response of the driver stage, a capacitor is coupled from the signal input of the driver transistor to a point of reference potential.

David E. Hollinden

Papers

Plural input television receiver having peaking circuit and chrominance band reject filter in a video signal channel

Television receiver with display driver amplifier and input video filter having inversely related bandwidths

Peaking circuit for video driver stage

Fernsehempfaenger mit zusaetzlichem videoeingang

Video signal processing and display system