Abstract: The adaptive comb filtering system presented herein is used to separate the luminance and chrominance components of a composite video signal. This video signal is comprised of a plurality of successive horizontal scan lines. The video signal is separated into a middle (M) scan line component and vertically adjacent top (T) and bottom (B) scan line components. These video signal components are employed to provide as a chrominance output signal either a combed chroma signal derived from the top, middle and bottom components, or an uncombed chroma signal derived from only one of the components. The selection of the combed chroma signal or the uncombed chroma signal is determined by a transistion detector which compares a vertical transition with a horizontal transistion and selects one of the signals as the chrominance output signal in dependance upon the comparison.

Abstract: A noise adjusted recursive filtering apparatus is presented for use in processing video signals having picture portions and predetermined nonpicture portions. A noise detector responds to video signals during a nonpicture portion for providing a noise signal having a magnitude representative of the average noise level on the video signal. A recursive filter is provided for filtering the video signal and this filter includes a delay for delaying the input video signal together with circuitry for determining the difference between a present input video signal and a delayed video signal. The difference signal as well as the noise level signal are employed for purposes of providing a correction signal which is added to the input signal to provide an output video signal. The correction signal is a nonlinearly related percentage of the difference signal and varies as a function of the difference signal and the noise level signal.

Abstract: A video signal clamping arrangement is provided for periodically clamping a predetermined nonpicture portion of a video signal, having picture portion and predetermined nonpicture portions, to a desired reference level with a clamp time duration varying as a function of noise on the video signal. A noise detector is employed for providing a noise level signal representative of the average noise level on the video signal during a predetermined nonpicture portion thereof. A controllable switch is employed for purposes of completing a clamping circuit for clamping the video signal to a desired signal level. A clamp pulse timing circuit responds to the noise level signal for providing a switch control signal for controlling the switch on time duration as a function of the magnitude of the noise level signal.

Abstract: A sync detector is provided for recovering or extracting a sync signal from a video signal. The circuitry includes a slice level comparator for comparing the video signal against a slice level signal for providing a sync signal in dependence upon the comparison. The slice level signal is adjusted as a function of noise measured during a nonpicture portion of the video signal.

Abstract: A video recorder and playback system for storing video information consisting of video frames successively presented at a standard frame rate, each frame having first and second interlaced video fields, and for playing back the video information in a desired sequence to produce a video output signal, providing either slow motion or normal motion effects when viewed on a monitor, includes a frame recorder. The frame recorder has a rotatable recording medium, first and second transducer means for recording and playing back video frames in recording tracks on the recording medium, and means for rotating the medium at the standard frame rate such that a video frame is recorded in each of the recording tracks. A field store is responsive to the recorder for storing a field of video information replayed from the recorder. A switch is connected to a field store and to the recorder for providing at the switch output video information from the field store or the recorder in response to a delay field signal.

Abstract: A video recorder and playback system for storing video information consisting of video frames successively presented at a standard frame rate, each frame having first and second interlaced video fields, and for playing back the video information in a desired sequence to produce a video output signal, providing either slow motion or normal motion effects when viewed on a monitor, includes a frame recorder. The frame recorder has a rotatable recording medium, first and second transducer means for recording and playing back video frames in recording tracks on the recording medium, and means for rotating the medium at the standard frame rate such that a video frame is recorded in each of the recording tracks. A field store is responsive to the recorder for storing a field of video information replayed from the recorder. A switch is connected to a field store and to the recorder for providing at the switch output video information from the field store or the recorder in response to a delay field signal.

Abstract: A magnetic recorder of the flexible disc type has an improved recording device comprising a pair of thin flexible recording discs having oppositely facing magnetizable surfaces and a flexible backing disc between the recording discs extending behind essentially their entire surface. A hub connects all three of said discs and forms the sole connection therebetween. The hub includes a central aperture and a drive aperture outwardly of the central aperture, the drive aperture including a surface extending along a chord of the hub to provide with the central aperture a unique two point attachment defining the center of rotation of the discs. A cassette surrounds the discs, protecting and supporting them, and including top and bottom walls spaced apart sufficiently to avoid substantial contact with the recording discs when the hub is rotated at recording speed.