Abstract: In a video monitor for display alphanumeric data on a kinescope display screen, a kinescope driver transistor receives binary video data signals at a low impedance emitter input electrode and provides high level video data output signals to the kinescope from a collector output electrode. A source of adjustable control voltage is coupled to the base electrode of the driver transistor for varying the intensity of the data display.

Abstract: An input filter for coupling television signals from a signal source such as an antenna to an RF signal processing stage includes series resonant input and output sections shunting the signal path. The input section forms a trap at the video IF frequency. The output section resonates at a frequency other than the sound IF frequency, below the band of television signal frequencies to be processed by the RF signal processing stage. The filter serves to attenuate unwanted stray signals such as video and sound IF components otherwise capable of interfering with and distorting the input television signals.

Abstract: In a video signal processing and display system such as a television receiver employing digital video signal processing techniques, viewer generated control signals for normally controlling the brightness and/or contrast of a displayed image are utilized in analog rather than digital form for controlling the magnitude of the video signal.

Abstract: A television receiver includes a kinescope and a current sensing transistor for conveying amplified video signals to the kinescope, and for providing at a sensing output terminal an output signal related to the magnitude of kinescope current conducted during given sensing intervals. A clamping circuit clamps the sensing output terminal during normal image intervals, and unclamps the sensing output terminal during the sensing intervals. The clamping circuit facilitates interfacing the sensing transistor with utilization circuits which process the sensed output signal, and assists to maintain a proper operating condition for the sensing transistor.

Abstract: In a digital video signal processing system including a kinescope for displaying a video image, a video signal digital-to-analog converter receives input digital video signals and provides high level output analog video signals with a magnitude suitable for directly driving an intensity control electrode (e.g., cathode) of the kinescope.

Abstract: A motion detector for detecting motion in a picture contained in a television signal includes a filter that extracts a portion of the frequency spectrum of the television signal. The amplitude of the sidebands of the television signal in this portion of the frequency spectrum is indicative of motion in the picture scene. The signal from the filter is coupled to a peak detector that produces a motion indicative signal. The amplitude of the motion signal is proportional to the absolute value of the amplitude of the sidebands in this portion of the spectrum.

Abstract: A receiver includes a line store progressive scan processor and a frame store progressive scan processor for doubling the line rate of a video input signal for display. The video input signal includes an identifying signal signifying whether the fields that are derived from a common scene. The identifying signal is detected and used to control a switch for selectively coupling the output of the processors to a display such that frame store processed signals are displayed for fields derived from exactly the same scene and line store processed signals are displayed for "mixed" fields (i.e., fields from different frames or frames containing motion).

Abstract: An IF signal filter in the IF sound channel of a television receiver exhibits peak amplitude responses which are unsymmetrical and slightly offset from the nominal picture and sound carrier frequencies by an amount dictated by the amount of tilt introduced by the tuner and the IF signal processing section. As a result, a filtered IF signal applied to a sound demodulating system exhibits a substantially symmetrical characteristic with respect to both the sound and picture carrier frequencies, yielding reduced audio buzz and harmonic distortion.

Abstract: A speed-up memory converts interlaced RGB input signals to double line-rate (progressive scan) form. A vertical detail signal is derived from the RGB input signals before or after speed-up and a vertical peaking signal is derived from the detail signal. During the first read operation of the speed-up memory both signals are added to the speeded-up signals to effect a preshoot of the resultant signal and during the second speed-up memory read operation only the peaking signal added to affect an overshoot of the resultant signals whereby alternate lines of the converted RGB signals exhibit enhanced vertical detail.

Abstract: In a television receiver, a non-saturating kinescope driver amplifier arrangement includes an input current limiter circuit coupled between a source of video signal and a current responsive signal input of a feedback kinescope driver amplifier. The limiter circuit, e.g., including a diode limiter, limits the magnitude of input signal currents applied to the current input of the amplifier to prevent the amplifier from exhibiting a saturated conductive state.

Abstract: A DC coupled system for automatically controlling the peaking content of a video signal includes a frequency selective peaking amplifier, a source of control voltage for controlling the conduction of the amplifier, and an interface circuit including a high output impedance current source network for coupling the control voltage to the amplifier. The interface circuit prevents the amplifier from being loaded excessively by the impedance of the source of control voltage, and assists to assure that the amplifier exhibits negligible gain for DC conditions.

Abstract: In a digital video signal processing system including an image reproducing kinescope and a digital-to-analog converter (DAC), excessive kinescope beam current are automatically limited in response to a control signal which varies a reference voltage for the DAC such that the peak-to-peak amplitude of analog video signals from the DAC is reduced. A version of the control signal is applied to the output of the DAC with a magnitude and polarity for substantially negating unwanted shifts of the video signal black level during the beam current limiting mode.

Abstract: A television receiver with a planar faceplate kinescope includes an automatic kinescope bias (AKB) control system wherein the kinescope electron gun is energized to induce a cathode output current, representative of the kinescope black image current level, in response to an auxiliary drive signal applied to the electron gun during AKB operating intervals. The auxiliary signal exhibits an amplitude for inducing the cathode current only during horizontal trace intervals encompassed by the interval when the auxiliary signal occurrs.

Abstract: In a television receiver including a kinescope, a kinescope driver stage includes a video amplifier with an associated feedback path. A first emitter follower transistor couples amplified video signals from the amplifier output to the kinescope. A second emitter follower transistor, included in the feedback path for maintaining the continuity thereof, couples amplified video signals to the kinescope when a normally nonconductive diode coupled between the outputs of the emitter follower transistors is rendered conductive in the presence of large video signal amplitude transitions sufficient to render the first follower transistor nonconductive.

Abstract: A video monitor includes an image displaying kinescope which exhibits a temperature dependent conduction characteristic that results in declining light output and image brightness during an initial warm-up period, from a time soon after the system is initially energized to a time several minutes later when steady-state operation is reached. To counteract the declining kinescope light output during the warm-up interval, a compensation circuit having a time constant characteristic which approximates the kinescope conduction characteristic during the warm-up interval causes the kinescope to exhibit increasing light output and image brightness during the warm-up interval. Thus substantially uniform light output is produced over the warm-up interval.

Abstract: A television system for generating a composite video signal for an image having extended aspect ratio such as 5:3, and for displaying such composite video signal in a television image area having the same extended aspect ratio. The horizontal blanking interval of an NTSC composite video signal is utilized for the transmission of video information characterizing either the right or the left edge of a display line of the picture; whereas, the remaining portion of the NTSC signal is utilized for the transmission of video information characterizing the inner portion of the display line between the edges. The video information for the missing edge in each display line is derived in the receiver from video edge information of adjacent display lines.

Abstract: A double scanning receiver includes a video speed-up memory with read and write clocks locked to multiples of burst. Visible artifacts tend to be produced when displaying non-standard video signals (e.g., from a VCR, game, computer, etc.) due to skew of the memory clock signals with respect to horizontal sync. Skew artifacts are corrected by delaying the output signal of the memory as a direct function of the read clock skew and as an inverse function of the write clock skew. The write clock skew is measured for each memory read and write cycle. The read clock skew for the first memory read cycle is obtained by doubling the write clock skew measured at the start of the first read cycle. The read clock skew for the second memory read cycle is obtained by adding the write clock skew measured at the start of the second read cycle to a measured half-period of the video input signal and doubling the fractional part of the sum thereof.

Abstract: An apparatus is disclosed for wave soldering a printed circuit board having an RF shield member mounted on the component side of the board with tabs extending beyond the electrical conductor side of the printed circuit board. Holes provided in the shield tabs allow the solder wave to pass through the tab to reach contact pads immediately behind the tab and also to reduce splash back and excessive build up of the solder caused by the solder wave striking the tab. Use of the apparatus eliminates costly and time consuming hand soldering operations for the RF shield member.

Abstract: In a chrominance signal demodulating system a locally regenerated chrominance subcarrier signal is phase shifted to produce R-Y, G-Y and B-Y phase subcarrier signals, which are applied to respective color difference signal demodulators together with the chrominance signal to be demodulated for producing demodulated R-Y, G-Y and B-Y color image difference signals. The subcarrier signal is at the "I" phase and is processed by an automatic flesh tone correction network responsive to chrominance signal phases in the vicinity of I phase.

Abstract: A digital video signal processing circuit generates interlaced luminance and chrominance signals from interlaced composite color video signals. The interlaced luminance signal contains vertical detail information without peaking. Each of two progressive scan speed-up processors, controlled to operate in parallel, receives the interlaced luminance and chrominance signals. In each of the speed-up processors, the chrominance signals are time compressed and repeated to generate two lines of time compressed chrominance video for each line of interlaced chrominance video. Furthermore, in each of the speed-up processors, a vertical detail signal is regenerated that contains vertical detail information derived from the interlaced luminance signal. The vertical detail signal is nonlinearly processed to generate a vertical peaking signal that is combined with the vertical detail signal. A time compression stage speeds up the peaked vertical detail signal to a double line rate.