CN87103833A

CN87103833A - Pictur recording device

Info

Publication number: CN87103833A
Application number: CN87103833.1A
Authority: CN
Inventors: 西原通阳
Original assignee: Sharp Corp
Current assignee: Sharp Corp
Priority date: 1984-10-03
Filing date: 1987-05-28
Publication date: 1988-01-20
Also published as: CN85104931B; CN87103859A; CN85104931A; CN1005675B; CN87103855A; CN1005954B; CN86107924A; CN1003905B; CN1005953B

Abstract

The present invention relates to a kind of like this Pictur recording device, during picture intelligence that it writes down, can eliminate the jitter phenomenon of its time shaft that contains change on reproducing medium such as video disk, when still image reproduces, can obtain the high quality image that does not have tone irregular.This Pictur recording device is made up of following part basically: read and be stored in the read-out device that the tracer signal on the video disk is used; Make the field deferred mount of the picture reproducing signal delay that read-out device provides; The display unit that the picture intelligence that the field deferred mount is come shows on display devices such as cathode ray tube.

Description

The present invention relates to a kind of like this Pictur recording device, during picture intelligence that it writes down, can eliminate the jitter phenomenon of its time shaft that contains change on reproducing medium such as video disk.

The invention still further relates to the field deferred mount of vision signal, the image that it writes down on to video disk carries out still image or freezes frame when reproducing, can obtain from used incoming video signal one and (or) vision signal of several delays.

For example, the past is reproduced still image or when freezing frame from the normal activity image that mediums such as video disk write down, employing be the mode that the same groove of this recording medium is reproduced repeatedly.But the so-called blooming of picture reproducing can take place in this mode inevitably.

And when containing shake in the picture intelligence that reproduces, the quality of image will descend, and particularly when still image reproduced, the tone of chromatic image can significantly worsen.Therefore, must eliminate the shake of picture reproducing signal.Past, in order to eliminate this time base flutter, adopted the means for correcting of vairable delay line, perhaps adopt reproducing signal is converted to so-called digital time base correction (DTBC) device of shaking with the memory absorption again behind pulse-code modulation (PCM) signal.But this vairable delay line means for correcting or digital time base means for correcting cost an arm and a leg, and be not too practical.

The object of the present invention is to provide a kind of image reconstruction method, it just can eliminate the shake of picture reproducing signal with simple structure, thereby does not have tone irregular and can obtain high-quality image when still image reproduces.

Device of the present invention designs with regard to being based on above consideration, and its purpose is to realize the active images common from recording medium the still image or the reproduction of freezing frame of no image diffusion.

Device of the present invention constitutes according to above each point, and its purpose is to carry out effectively the clamp of a delayed video signal, makes a delayed video signal to not influence of picture reproducing.

The object of the present invention is to provide a kind of image reconstruction method, it is controlled on the certain value incoming level again of memory automatically, thereby can obtain flicker free, high-quality picture reproducing.

Other purpose of the present invention and further range of application can fully be recognized from following detailed.Yet should be understood that, when explanation preferable embodiment of the present invention, any specific examples of describing in detail all only provides with diagramatic way, and for those of skill in the art, it is easy making various changes and modification within the spirit and scope of the present invention.

In order to achieve the above object, the field deferred mount of Pictur recording device of the present invention, its characteristics are to have following column circuits: circuit is eliminated in the blanking of removing blanking from incoming video signal; Vision signal after the above-mentioned elimination blanking signal is carried out the field postpone, and with its field memory circuit as delayed video signal output; Synchronous signal generating circuit with above-mentioned incoming video signal genlock; The chrominance carrier continuous wave generation circuit phase-locked with the burst signal of above-mentioned incoming video signal; The hybrid circuit that in above-mentioned delayed video signal, adds above-mentioned synchronizing signal and burst signal.

That is to say, vision signal is not imported in the field memory, thereby can reduce the semaphore of importing field memory at black-out intervals.

From following detailed and accompanying drawing, can fully understand the present invention, but accompanying drawing only plays the diagram effect, is not construed as limiting the invention.

Fig. 1 is the field deferred mount block diagram of using in the Pictur recording device of the present invention.

Fig. 2 is the oscillogram that concerns between the outputting video signal of explanation incoming video signal of field memory and hybrid circuit.

Vision signal by clamp circuit 10 clamps is input to field memory 11 by input diverter switch S1, the handover operation of diverter switch S1 is to be undertaken by the control signal of control switching circuit 105, and control switching circuit 105 enters operating state according to the command signal of input 101.The synchronizing signal of synchronizing separator circuit 9 makes control switching circuit work and removes blanking signal.The clock circuit 16 that passes on produces according to the signal of synchronizing separator circuit 9 and passes on clock pulse, makes one of video signal delay in the field memory 11, and exports as delayed video signal.

The delayed video signal that field memory 11 provides enters hybrid circuit 13 through low pass filter 12.

In hybrid circuit 13, as shown in Figure 2, delayed video signal A added enter a profession, field sync signal S ' 1 and burst signal S ' 2.Therefore, delayed video signal A also exports as inhibit signal B through a delay behind hybrid circuit 13 again.

Above-mentioned burst signal S ' the 2nd, the continuous wave generation circuit of being made up of phase comparator 115, low pass filter 116, VCXO (VCXO) 117, burst gate 118 and phase shifter 119 etc. 120 produces.Also send into above-mentioned hybrid circuit 13 by the burst signal that this continuous wave generation circuit 120 provides, mix with delayed video signal there.

Just, bit comparison is mutually carried out in the output that burst signal in the incoming video signal provides with VCXO 117 in phase comparator 115, with the frequency of oscillation of its error signal control VCXO 117, thereby produce the chrominance carrier continuous wave phase-locked with the burst signal of incoming video signal.Then, the output pulse through burst gate 118 produces burst signal.The phase deviation of being undertaken in one by phase shifter 119 is proofreaied and correct again, thereby obtains adding the burst signal in the admission delay signal.The signal of output is added to output 104 and sends into video circuit by output dip switch S2.

The vision signal of importing diverter switch S1 and obtaining to postpone is again delivered in another road of hybrid circuit 13 outputs after amplifier 15 amplifies.

As mentioned above, adopt when of the present invention, owing to can reduce the semaphore of input field memory, thus can use bit number than the field memory of passing by to lack, thus price can be reduced. In addition, can be not do not transmit by what clock circuit produced to field memory at black-out intervals and to pass on clock pulses, thereby the clock pulses that black-out intervals can be easily produces clock circuit is as the control signal that drives or stop other device. Manufacturing and designing aspect the video equipment, structure that can the simplifier clock pulse generating circuit is accomplished further to reduce cost, and is easy to make.

Image reproduction method of the present invention is not only applicable to the video disk record reproducing device, and is applicable to the far-ranging technical fields such as magnetic tape recording reproducing device.

Can find out significantly that by above explanation the present invention can have many variations, the variation of these forms does not break away from aim of the present invention and scope, and all these forms all is considered as being included in the scope of following claim.

Claims

The field deferred mount of Pictur recording device, its characteristics are to have following column circuits: circuit is eliminated in the blanking of removing blanking from incoming video signal; Vision signal after the above-mentioned elimination blanking signal is carried out the field postpone, and with its field memory circuit as delayed video signal output; Synchronous signal generating circuit with above-mentioned incoming video signal genlock; The chrominance carrier continuous wave generation circuit phase-locked with the burst signal of above-mentioned incoming video signal; The hybrid circuit that in above-mentioned delayed video signal, adds above-mentioned synchronizing signal and burst signal.