A subscription television is disclosed wherein both subscription and non-subscription television system signals are distributed by a cable distribution system to a plurality of switching stations. Subscriber demand signals generated within one or more subscriber locations are detected within the switching station to couple subscription signals to the corresponding subscriber drops. Periodic interrogation signals cause the switching station to generate a return signal indicative of the presence o...

A circuit for supplying a current to a dynamic convergence coil on a color cathode ray tube for dynamically correcting misconvergence of electron beams in the tube, which comprises current producing means to cause a parabolic current having a period of the line interval to flow through the dynamic convergence coil in response to a horizontal pulse train, modulating means for modulating in amplitude the parabolic current by means of a parabolic voltage having a period of the field interval suppli...

Unwanted noise components in a derived composite video signal are processed in a novel noise processing circuit to effectively minimize the otherwise deleterious effects on the operation of associated electronic apparatus, such as a television receiver or the like. The circuit arrangement is such that a control signal of a selectably fixed amplitude is developed in response to each such unwanted noise component above a set, predetermined amplitude. The derived control signals are then substitute...

The invention discloses a means and method of eliminating jitter, during playback, in video reproducing and/or recording apparatus utilizing the skip field system. This jitter is eliminated and both horizontal and vertical continuity of sync assured by phase displacing head No. 2 and delaying, in a controlled manner, the vertical synchronizing signals applied to the television receiver for playback by heads Nos. 1 and 3.

Black and white runs of scanned image signals are encoded into binary information at a transmitting station, transmitted over a transmission link and received by apparatus at a receiving station. Jitter introduced during the transmission is detected by the apparatus prior to the decoding of the received signal to produce an error indicating pulse which is utilized to effect erasure of the image signals of the line scan in which the jitter has occurred to leave the line as a white run. As an alte...

The invention provides a method and apparatus for correcting shading distortion in a source of scanned video signal. A multiple location store is provided for storing a signal indicative of the shading correction required at each of a number of selected, spaced apart points in the scannable region of the source and signal interpolation means is provided for interpolating between the stores values of correction in both line and frame scan directions for other points in the region. The invention a...

Circuits are disclosed for processing color encoded video signals, encoded per a format wherein a chrominance signal in the form of a modulated subcarrier is buried in spectrum "troughs" in the midband of a wider band luminance signal, an illustrative use of the encoding format being in video disc recording. The processing circuits serve, in use with composite signals developed during video disc playback, to convert an input composite signal of buried subcarrier format to an output composite sig...

A device for enhancing video reception from a silicon target vidicon by rction of smeared images. Conventional television scanning parameters are used to display images of the scene being viewed. Light rays from the scene are impinged upon a silicon target of photodiodes within the vidicon. A circuit is provided for grounding the target electrode between successive vertical scans of the electron beam thus reducing the time during which smearing of the image occurs.

Flesh tones of reproduced images in a color television receiver are enhanced by a gated automatic tint control circuit which includes first and second color demodulators each coupled to a chrominance signal source and to a phase shift network which is in turn coupled to a reference oscillator signal source. A switching means coupled to the phase shift network is also coupled to the output of one of the color demodulators. The switching means alters the phase shift network and the phase angle of ...

In an apparatus and method for converting an image of a color object to an electrical signal and using sharp and unsharp spots, luminance information is the sole information derived from the sharp spot, while all color information is derived from the unsharp spot. Color signals derived from the unsharp spot are combined to produce a low definition luminance signal which is combined with a high definition luminance signal derived from the sharp spot to provide image edge enhancement.