 Method and apparatus for reducing noise in a video signal |
| I claim: 1. A method of reducing noise in a video signal, comprising: passing said video signal ... |
|
| Semiconductor delay line driven by an input signal-derived reference signal |
| It is an object of the present invention to provide a method of driving a semiconductor delay line ... |
|
| Method of recording and reproducing color video signals |
| The present invention therefore contemplates to alleviate the drawbacks described above, and a ... |
|
| Recording apparatus |
| An object of the present invention is to eliminate the drawbacks in the prior technology. Another ... |
|
| Recording/reproducing apparatus and information medium transfer method |
| It is an object of the present invention to solve these problems, and to extend the product ... |
|
| Image recording/reproducing apparatus |
| It is therefore an object of the present invention to provide a video recording/reproducing ... |
|
| Electro luminescence device and electrophotographic printing system using the same |
| An object of the present invention is to provide an EL device having an electrode arrangement ... |
|
| Chrominance encoding for a widescreen television system |
| What is claimed is: 1. In a system for processing a television type video signal including first ... |
|
|
Chroma signal phase correction circuitry to be used in a color video information playback system
| Details |
Inventors: Akiyama, Toru;
Assignee: Pioneer Electronic Corporation (Tokorozawa, JP)
Primary Examiner:
Assistant Examiner:
Attorney, Agent or Firm:
A chroma signal phase correction circuitry to be used in a video information signal playback system for playing back the video information recorded on a recording medium, having a special playback mode of operation for jumping from one portion of recording tracks to the other, comprises a plurality of phase correction channel having a substantially constant frequency amplitude characteristics and a phase characteristics satisfying a condition that the difference between the phase shift values of each of the phase correction channel is equal to the difference between the phase of the color subcarrier signals of the color video signals from adjacent two recording track portions, and a switching means for selecting one of the phase correction channels for allowing the color video signal to pass therethrough, whereby compensating for the phase shift of the chroma signal during the jump operation while maintaining a phase of a luminance signal component of the color video signal. |
|
DETAILED DESCRIPTION An object of the present invention is therefore to provide a phase correction circuitry for a chroma signal to be used in a system for playing back color video information which is capable of effecting the phase correction only to the chroma signal component using a rather simple circuit configuration.
According to the present invention a chroma signal phase correction circuitry for effecting phase correction on a chroma signal component of a color video signal played back from a recording medium upon the occurence of a jump operation by which a point of picking up recorded information is moved from one recording track portion to another, is characterized by a plurality of phase correction channels having a constant frequency-amplitude characteristics, and a phase characteristics satisfying a condition that a difference between the phase shift values of each of the phase correction channels at a frequency of a color subcarrier signal component of the color video signal is equal to a phase difference of color subcarrier signal components of color video signals from each of the recording track portions, and a switching means for selecting one of the phase correction channels for permitting the color video signal to pass therethrough, in response to each occurrence of the jump operation.
According to another aspect of the present invention, the color video signal is a signal based on the NTSC system, wherein the number of the phase correction channels is two, and the magnitude of the phase difference is selected at 180.
degree.
.
According to further aspect of the invention the color video signal is a signal based on the PAL system, and wherein a first to fourth phase correction channels are provided and the difference among the phase characteristics of the phase correction channels are determined such that the phase shift amount from the first phase correction channel to the second phase correction channel, third phase correction channel, and fourth phase correction channel are respectively equal to 90
|
| Related patents |
|
|
Method of access to recording medium, and apparatus and method for processing information
An object of the present invention is to provide a method of access for a recording medium, which is free from the above-mentioned disadvantages, realizes high-density ...
|
|
|
Recording and reading space control between a read/write probe and a recording medium
The present invention has been made to solve the above-noted problems and has as its object the provision of a system which, in recording and reproduction to which the ...
|
|
|
Optical disc with data recorded at different rates on different zones and recording apparatus, and reproducing apparatus therefor
It is therefore an object of the present invention to provide an optical disc recording apparatus, an optical disc reproducing apparatus, an optical disc recording and ...
|
|
|
Information recording apparatus and process for recording on a recording medium with pit edges shifted in a step-wise fashion
We claim: 1. An information recording apparatus of the type which includes recording means for recording digital information on an information recording medium from ...
|
|
|
Disc player for playing different types of discs which automatically identifies the type of a currently loaded disc
An object of the present invention is to provide a disc player for playing back discs of different types, in which the reproduction mode need not be set manually each ...
|
|
|
Method of recording and reproducing video format signal using division video signals on a plurality of recording media
It is, therefore, an object of the invention to provide a recording and reproducing method which can automatically play a correct combination of a plurality of disks. In ...
|
|
|
Method of digitally compressed video and audio data
It is therefore an object of the present invention to provide a data recording system capable of easily recording in a recording medium a data file which contains ...
|
|
|
Adapter and adapter system for playback of a compact disc and a mini disc in an optical disc apparatus
Accordingly, the present invention has been made in order to solve to the aforementioned problems, and an essential objective of the present invention is to provide an ...
|
|
|
ECL in a recording and reproduction device in which coefficient groups including coefficient data corresponding to low frequency components of the first axis in at least two overlapped coding blocks are not recorded by the same recording head
An object of the present invnetion is to provide a recording a reproducing apparatus with image coding in which an image will never be dropped out in blocks even if a ...
|
|
|
Video recording and reproducing device and method including video signal record restart during rewind/playback operation after non-detection of pilot signal in video track
In view of the foregoing, an object of the present invention is to provide a rotary head type magnetic recording and reproducing device in which, instead of fixed heads ...
|
|
|
TV Signal 
