Sony Corporation

Katuhiko Nishikawa

Yoshio Ogawa

Kimio Hatajiri

Yasuhito Maeshima

Toshiaki Meguro

Hiroya Ikeda

Hidenori Hirai

Yoshinori Onoe

A color video signal detector that detects the color level and the color phase of a color video signal includes a differentiating circuit that differentiates a color video signal to detect edges in the color video signal, a switching IC that holds values of the color video signal at times after a given time interval from the edges, a circuit that counts the order of the edges and extracts the value of the color video signal at every count, and a microcomputer that measures the extracted values of the color video signal.

Color video signal detector and color video signal detecting method

A general scanning-period converting device is equipped with two frame memories (first and second frames), and a video signal is written in any one of the frame memories (e.g., first memory) at a scanning period thereof while the video signal is repetitively read out from the other frame memory (e.g., second memory) in accordance with a synchronizing signal having a desired (target) shorter scanning period. When the write-in operation of the first frame memory is finished, the first frame memory is switched so as to carry out a read-out operation from an address thereof corresponding to a read-out address of the second frame memory at the finishing time of the write-in operation thereof, and the second frame memory which has carried out the read-out operation is switched so as to carry out the write-in operation.

Apparatus for converting the scanning period of a video signal to a

An apparatus for providing electromagnetic shielding. A wire for carrying an electrical signal is shielded with a first cylindrical ferrite shield by passing the wire through its central passage. The first ferrite shield has magnetic characteristics which provide attenuation of electrical noise over a first particular frequency band. A second cylindrical ferrite shield is situated adjacent the first shield with the wire passing through its central passage. The second ferrite shield has magnetic characteristics which provide attenuation of electrical noise over a second particular frequency band. A plastic package surrounds the first and second ferrite shields, and holds the first and second shields end to end in fixed proximity to one another. The plastic package includes a pair of half-cylindrical package sections having a joined edge and two open edges with a hinge portion joining the pair of package sections at the joined edge. A pair of latches, each including a hole, are situated at one of the open edges. A pair of recessed portions with hooks are aligned with the latches and engage the latches when the half-cylindrical sections are rotated to a closed position to form the cylindrical shape. A plurality of projections are situated at the open ends of the package sections and adjacent an end of each of the first and second ferrite shields. These projections project toward a central area of the package when in the closed position to retain the first and second half-cylindrical portions of the first and second ferrite shields within the plastic package.

Electric parts for shielding electromagnetic noise

A video signal processing circuit includes a separating circuit for separating a sync. signal of a video signal, a sample-and-hold circuit for subjecting a d.c. reference portion of the video signal to a sample-and-hold operation in response to the separated sync. signal, and a superimposing circuit for reversing the polarity of the d.c. reference voltage subjected to the sample-and-hold operation and superimposing it on the video signal to eliminate an unnecessary fluctuation component of the video signal. The separation of the sync. signal by the sync. separating circuit is performed on the basis of the video signal from which the unnecessary fluctuation component is eliminated by the superimposing circuit.

Growing community of inventors

Aichi, Japan

Katuhiko Nishikawa