Video signal reproducing apparatus
AssigneeSony Corporation
InventorHajime Nishimura
Life of this patent
Estimating the term…
Abstract
A video signal reproducing apparatus plays back at a high speed a recorded signal recorded on a recording medium, eliminating noise bars in the reproduced image by replacing a noise portion, that is, a signal portion reproduced by a magnetic head having a different azimuth from the azimuth of a track on the recording medium, with a corresponding signal portion of a previously reproduced track having the same azimuth as the magnetic head. The recorded signal is a shuffled video signal having mutually adjacent lines of one field recorded on different tracks of the recording medium in a predetermined sequence. Then the apparatus deshuffles the reproduced signal devoid of noise bars to obtain a deshuffled video signal.
Claims6
A video signal reproducing apparatus for high speed playback of a recording medium having a shuffled video signal of one field recorded thereon in a plurality of tracks, said shuffled video signal having mutually adjacent lines of an image of said one field recorded on different tracks in a predetermined sequence, said apparatus comprising:
- playback means for generating a reproduced signal by playing back said recording medium at a high speed used in a high speed playback mode and which is an integer plus 1/2 times a standard speed used in a standard speed playback mode;
- memory means including a one-track memory into which said reproduced signal is written in response to one state of a control signal and further including a one-frame memory;
- detector means for detecting a noise bar in said reproduced signal and for providing another state of said control signal to inhibit writing of said reproduced signal in said one-track memory in response to detecting of said noise bar;
- clock generating means for generating a clock signal based on said reproduced signal;
- means applying said clock signal to said one-track memory for reading data devoid of noise bars from the latter;
- means applying said clock signal to said one-frame memory for writing said data devoid of noise bars into said one-frame memory in synchronism with said reading of said data devoid of noise bars from said one-track memory;
- and
- readout control means for controlling readout of said data devoid of noise bars from said one-frame memory so as to produce a deshuffled video signal having a deshuffled sequence which is the inverse of said predetermined sequence and which is the same for the high speed playback mode and for the standard-speed playback mode.
A video signal reproducing apparatus for high speed playback of a recording medium having a shuffled video signal recorded thereon in a plurality of tracks, said apparatus comprising:
- playback means for generating a reproduced signal by playing back said recording medium at a high speed which is an integer plus 1/2 times a standard speed;
- memory means including a one-track memory into which said reproduced signal is written in response to one state of a control signal and further including a one-frame memory;
- detector means for detecting a noise bar in said reproduced signal and for providing another state of said control signal to inhibit writing of said reproduced signal in said one-track memory in response to detecting of said noise bar;
- clock generating means for generating a clock signal based on said reproduced signal;
- means applying said clock signal to said one-track memory for reading data devoid of noise bars from the latter;
- means applying said clock signal to said one-frame memory for writing said data devoid of noise bars into said one-frame memory in synchronism with said reading of said data devoid of noise bars from said one-track memory;
- and
- control means for controlling reading out of said data devoid of noise bars from said one-frame memory so as to produce a deshuffled video signal in which a plurality of lines in each field are composed of a same portion of the reproduced signal.
Dependencies are inferred from the claim text.