JPS6352587A - Video signal recorder - Google Patents

Abstract

PURPOSE:To allow a monitor device to grasp the state of a recording signal correctly by providing a video signal control means and outputting an output signal having picture information of any field from a signal output means when a recording means records a video signal of one field. CONSTITUTION:A switch 132 of a total control section 86 is thrown to the position of a terminal FL in case of the field recording mode. A changeover circuit 110 selects a signal at inputs 114, 122 alternately and outputs it to an output 128 in response to a switching pulse SWP. Similarly, a changeover circuit 112 selects a signal at inputs 116, 124 alternately and outputs it to an output 130. A signal at the inputs 114, 116 is outputted directly to the output 128 of the changeover circuit 110 and the output 130 of the circuit 112 in a 1st field and a video signal at the inputs 114, 116 retarded by 0.5H from a delay circuit 118 is outputted directly in a 2nd field. The video signal is subject to line sequential synchronization and outputted to a video monitor 156 in a form of an NTSC composite video signal.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a video signal recording device, and more particularly to a video signal recording device for recording a video fR signal representing a still image onto a signal recording medium such as a magnetic disk.

BACKGROUND ART For example, there is a demand for a video signal recording device that records a video signal representing an image of 1 frame on a magnetic disk. A commonly used video signal is a frame video signal in which two fields are interlaced scanned. . When recording a video signal on a magnetic disk, a video signal recording device is required to monitor the video to be recorded in order to process the video signal and correct the color and gradation to a desired state. It is desirable that this video monitoring be performed in a state similar to that when a recorded video signal is reproduced from a magnetic disk.

By the way, it is also possible to perform ``field recording,'' which uses a video signal recording device for recording an interlaced scanned frame video signal to record only the video signal of one field included in the interlaced scanned video signal. It may be required to be configured in a certain way. In that case, if the input video signal is a frame video signal based on interlaced scanning, the video signal will be displayed as is on the video monitor device, but since only the video signal of one field will be recorded on the magnetic disk, it will not be recorded. The resolution of the video signal is only half that of the monitor image.

Even when field recording of video signals is performed using a video signal recording device configured in this way, the video signals are only recorded on the magnetic disk with half the resolution of the image displayed on the monitor device, so the recorded signal It was difficult to accurately grasp the status of the equipment using a monitor device.

OBJECTS It is an object of the present invention to provide a video signal recording device that eliminates the drawbacks of the prior art and can appropriately grasp the state of an image recorded on a signal recording medium.

m1 raccoon 3 According to the present invention, a video signal recording device that repeatedly receives an l-frame video signal representing a still image and in which two fields are interlaced scanned, and records the video signal on a signal recording medium receives the video signal. a signal input means; a recording means connected to the signal input means for recording at least one field of the video signal on a signal recording medium as a video signal representing a still image; and an output signal for displaying an image represented by the video signal. A signal control device connected to the signal output means to output and the signal input means, and when the recording means records the video signal of one field, extracts the image information of any one field of the video signal and applies it to the signal output means. and when the recording means records the video signal of one field, an output signal having image information of any one field is output from the signal output means.

Circle 1 □□□ Standing Next, an embodiment of the video signal recording device by JJ will be described in detail with reference to the attached drawings.

Referring to FIG. 2, in an embodiment of the present invention, an input video signal representing a still image is input to input terminal 10.12 at a standard television signal rate with two interlaced fields forming one frame. and 14.

The terminal 10 receives the composite luminance signal Y4-S including the synchronization signal S, and the terminals 12 and 14 each receive the color difference signal R-Y.
and B-Y are input.

In this embodiment, the composite luminance signal Yes is FM modulated by the FM modulator 1B, and the gradation characteristics are corrected by the frequency (f) characteristic correction section 18. It is input to another Full modulation base 22 via 20. Line switch 20 has two inputs 12 and 1
4 alternately every horizontal scanning (IH) period and outputs it to its output 24, thereby converting the color difference signal into a line-sequential format. The line-sequential color difference signal (C) is subjected to FM modulation by an FM modulator 22, and its gradation characteristics are corrected by an f-characteristic correction section 24.

The FBI outputs from both fcf correction units 18 and 24 are mixed in a mixer 26 and sent to two recording amplifiers 28 and 3.
0 to terminals 32 and 34, respectively.

Is the third figure a tree? Particularly, a signal control functional part of the device that controls a video signal to be monitored and a signal output unit part that outputs a video signal for monitoring are shown.

Referring to the figure, terminals 32 and 34 are connected to magnetic heads 40 and 42 via one terminal RFC of changeover switches 3B and 38, respectively. The operation of the changeover switches 3B and 38 is controlled by the overall control unit 88, and when recording video signals on the magnetic disk 48, they are placed on the terminal REC side, and when reproducing video signals recorded on the magnetic disk 48, they are placed on the terminal REC side. Connected to the PB side.

In the case of "r-frame recording" in which video signals of two interlaced fields constituting one frame are recorded on two tracks of the magnetic disk 48, the switches 36 and 38 are always connected to the terminal PB side. Ori,
For example, the overall control unit 8B connects the switch 36 to the terminal REC only during the first field, and connects the switch 38 to the terminal REC only during the second field.

Further, in the case of "field deployment" in which only one field is recorded on the magnetic disk 48, the switches B4 and 132 are connected to the terminal FL side. For example, switch 3
Only the switch 6 is connected to the terminal REC side only during one field period, and the other switches 38 are left connected to the terminal PB side.

The device of this embodiment has an output shaft 4B of a spindle motor 44.
This is a video signal recording device that records input video signals in the form of frames or fields on a magnetic disk 48 that is removably attached to the computer. The spindle motor 44 has a predetermined speed,
For example, it is configured to rotate at a constant speed of 3,800 rpm. More specifically, the spindle motor 44 is
The latter is driven by a servo circuit 70.
Servo controlled by. Inlet cuff 2 of servo circuit 70
A frequency signal FC is inputted from the frequency generator of the spindle motor 44, and the other input cuff 4 receives the output of the phase detector 7B for detecting a predetermined rotational phase angle of the magnetic disk 48, that is, the phase generator signal. PG is connected via an amplifier 78. Other inputs 80 of the servo circuit 70 include
The output of the synchronous separator 82 is connected, and the synchronous separator 82
Input composite luminance signal Y4-3 received at device input terminal IO
A synchronizing signal is separated from the servo circuit 70 and supplied to the servo circuit 70.

The servo circuit 70 controls the drive circuit 88 in response to the frequency signal FC and the phase detector signal PC to steadily rotate the spindle motor 44 at a predetermined rotation speed. Furthermore, the synchronization signal S of the video signal supplied from the synchronization separation section 82
In response to this, the rotational phase angle of the magnetic disk 48 is servo-locked to a predetermined phase with respect to the synchronization signal S.

In this embodiment, the magnetic disk 48 is preferably a small video floppy with a diameter of approximately 50 mm.In this embodiment, up to 50 tracks can be recorded on the magnetic disk 48. magnetic heads 40 and 42
are supported by the head moving mechanism 50 so as to maintain a predetermined distance from each other. The head moving mechanism 50 is driven by a head motor 52 and can move the two heads 40 and 42 in the radial direction of the magnetic disk 48 while maintaining a predetermined interval.

The head motor 52 is driven by another drive circuit 84, and the amount of movement, direction of movement, and tracking servo of the heads 40 and 42 are controlled by the overall control section 8B.

The magnetic heads 40 and 42 are recording and reproducing heads that record and reproduce F)I-modulated video signals on the magnetic disk 48. field interlaced 2
Two field video signals are transmitted to two magnetic heads 4, respectively.
0 and 42, one field of video signal is recorded on each of the two tracks, and one frame of video signal can be recorded using interlaced scanning on this pair of tracks.

The other terminals PR of the changeover switches 36 and 38 are connected to inputs 56 and 58 of a regenerative amplifier 54.

The regenerative amplifier 54 is an amplifier including an input selector that selects and amplifies one of the inputs 5B and 58 in response to a control input 60 and outputs the amplified signal to an output 62 thereof.

A switch 64 is connected to the control input SO, and the switch s
One terminal FL of 4 is connected to a fixed reference level, and the other terminal FR is connected to terminal 8B. switch 6
4 is a "frame reproduction" whose operation is controlled by the overall control unit 8B, and which reproduces video signals of two interlaced fields constituting one frame from a magnetic disk on which they are respectively recorded on two tracks. In the case of terminal F
In the case of "field reproduction" in which data is reproduced from a magnetic disk on which only one field is recorded on the R side, it is connected to the terminal FL side.

The output 62 of the regenerative amplifier 54 is a band pass filter (BPF).
It is connected to an envelope detector 90 via 88. The envelope detector 30 is a detection circuit that detects the envelope of the FM modulated video signal detected from the magnetic disk 48 by the magnetic drives 40 and 42 through the regenerative amplifier 54. The detection output 92 is the overall control unit 8
It is input to B.

The overall control unit 86 is a control device that unifies and controls the operation of the entire apparatus, and is advantageously configured as a processing system such as a microprocessor. In FIG. 3, a control line 160 symbolically shows a control line V4 for each part of the main unit. When configured as a processing system, the envelope detector 90 converts the detected envelope value into digital data and inputs it to the overall control unit 86 . When reproducing the video signal recorded on the magnetic disk 48, the overall control unit 86 servo-controls the head motor 52 based on the detected envelope so that the heads 40 and 42 can be appropriately on-track on the designated track. can.

The output 62 of the regenerative amplifier 54 is also. High-pass filter () I
PF) 94 and low pass filter (LPF) 9B to FM demodulators 98 and 100, respectively. The high-pass filter 94 has a band for passing the composite luminance signal Y+S of the video signal, and the low-pass filter 9
8 has a band through which the line-sequential color difference signal C is passed. They are demodulated into baseband signals by demodulators 88 and 100, respectively, and a composite luminance signal is output to the output terminal 102.
Further, a color difference signal is output to the output terminal 104.

Referring to FIG. 1, terminals 102 and 104 are connected to one input 114 and 11B of switching circuits (SW) 110 and 112, respectively, via terminals PB of transfer switches 108 and 108, respectively.

Terminals 102 and 104 are also connected to the other inputs 122 and 124 of switching circuits 110 and 112, respectively, via delay circuits (0,5HDL) 118 and 120 that provide a 0.5H time delay to the input signal. . The other terminals EE of the switches 108 and 108 are connected to the composite luminance signal input terminal 10 of one device and the output 24 of the line switch 20, respectively.

Switches 108 and 108 are also part of the overall control section 8B.
The operation is controlled by the magnetic disk 48, and when reproducing a video signal recorded on the magnetic disk 48, it is connected to the terminal PB side, and in other cases, it is connected to the terminal EE side.

The switching circuit 110 switches input 1 in response to control input 12B.
14 and 122 and its output 128
This is a selection circuit that outputs to Similarly, switching circuit 112 is a selection circuit that selects either input 116 or 124 in response to control input 126 and outputs the selected input to output 130 thereof. The control input 126 is connected to a switch 132 similar to the SW2Ciro 4, one terminal FR of the switch 132 is connected to a fixed reference level, and the other terminal FL is vc-connected to the terminal 66.

The output 130 of the switching circuit 112 is connected on the one hand to one input of the switching circuit 134 and on the other hand to the input signal I
It is also connected to the other input 138 of the switching circuit 134 via a delay circuit (IHDL) 13B that provides a time delay of H. The switching circuit 134 is a selection circuit that accepts the two outputs 140 and 142 and outputs the color difference signals from the two inputs 130 and 138 to either of the two outputs 140,142, respectively. The selection is made according to the control output 146 from the color difference signal discrimination circuit 144.

The color difference signal determination circuit 144 is a circuit whose input is connected to the output 130 of the switching circuit 112 and determines whether the line sequential color difference signal arriving at the input 130 is R-Y or B-Y. In the case of the video floppy standard, this determination is performed using the color difference signal R-Y during the horizontal blanking period of the video signal.
FM modulation center frequency of 1.2MHz and that of B-Y1
．． 3>1) The 0 color difference signal determination circuit 144 determines whether the line sequential color difference signal currently arriving from the switching circuit 112 is R-Y or B-Y, which is performed by identifying the level difference due to lz. By controlling the switching circuit 134 accordingly, the color difference signal R-Y is always output at its output 140, and the color difference signal B-Y is always output at its output 142.

Outputs 140 and 142 of switching circuit 134 are NTSC
It is connected to an encoder 148, and in this embodiment is converted into a video signal of the NTSC standard color television system. Its output 150 is connected to one input of a mixer 152. A switching circuit 110 is connected to the other input of the mixer 152.
The output 128 of the mixer 152 is connected to the output 128 of the
This circuit mixes the signals of 128 and 128 and outputs the mixture to the output 154 of the wooden row. For example, a video monitor device 15B is connected to the device output 154.

By the way, the switching pulse S<P> supplied to the switches 64 and 132 is generated by the switching pulse generating section 158. The switching pulse generating section 158 is a signal generating circuit that generates at its output 8B a switching signal swp that alternates between two states in response to the phase generator signal PC from the phase detector 78. Therefore, the switching signal SsoP of the output 68 is a signal that takes one state during a certain field (LV) period, takes the other state during the following 1v period, and repeats this alternately. This FJJ change signal swp
is input to the control input 60 of the regenerative amplifier 54 through switch 64 for frame reproduction, and to the control input 126 of switching circuits 110 and 112 through switch 132 for field reproduction.

Explain the operation. Interlaced scanned frame video signals are inputted to the device input terminals 10, 12 and 4, and the 0 color difference signals R-Y and B-Y are converted into line sequential signals by the line switch 20. The composite luminance signal yes is mixed with the line-sequential color difference signal C in mixer 2B, and both amplifiers 28
and output from 30.

In the case of frame recording, the overall control unit 8S synchronizes with the phase generator signal PC and first connects the switch 3B to the terminal REC side only during the first field, and connects the switch 3B to the terminal REC side.
The video signal of the first field is recorded on one track of the magnetic disk 48. During this time, the other switch 38 is held on the terminal FR side.By connecting the switch 38 to the terminal REC side only during the period of the second field of zero order, the other head 42 can transfer the second field to the other track. Record the video signal. Meanwhile, one switch 3
8 is held on the terminal FR side.

By the way, during such a recording operation, the input video signal can be monitored on the video monitor 15B. In the wood-covered recording mode, the overall control unit 86 connects the switches 10B and 108 to the terminal EE side.The composite luminance signal Y+S from the device input 10 is sent from the terminal EE side of the switch 106 to the switching circuit 110. It is input directly to input 114 and through delay circuit 118 to input 122 . Similarly,
The line sequential color difference signal C from the line switch 20 is input from the terminal EE side of the switch 108 to the input 116 of the switching circuit 112.
and through delay circuit 120 to input 124 .

In the case of the frame recording mode, the overall control unit 86 connects the switch 132 to the terminal FR side, so that the switching circuits 110 and 112 switch the inputs 114 and 112, respectively, in response to the reference potential from the switch 132. The 11G signal is selected and output to outputs 128 and 130.

The color difference signal discrimination circuit 144 determines whether the line sequential color difference signal output from the switching circuit 112 to the output 130 is R-Y or B-.
Determine whether it is Y or not. If it is R-Y, the color difference signal R-Y of the input 130 is outputted to the output 140 during that IH period,
The color difference signal B-Y from before the IH period which has passed through the delay circuit 13B is outputted to the output 142. In the 0th order IH period, the color difference signal discrimination circuit 144 determines that it is B-Y. So input 130
The color difference signal B-Y of is output to its output 142, and the output 14
0 outputs the color difference signal of the IH period that has passed through the delay circuit 13B, that is, RY. This is done over the entire period of one field.

In this way, line-sequential color difference signals are synchronized, and '4TS
It is converted into an N TSC signal by a C encoder 148, mixed with a composite luminance signal by a mixer 152, and output to an output terminal 154.
is output to. The input video signal is visualized on the video monitor 15B connected to the device output 154 in its field-interlaced form.

In the case of field recording, the overall control unit 86 connects the switch 36 to the terminal REC side only during one field period in synchronization with the phase generator signal PG, and controls one side of the magnetic disk 48 using one helad 40. One field of video signal is recorded on a book track. Meanwhile, the other switch 38 is connected to terminal PB.
Hold it to the side.

In the field recording mode, the overall control section 8B connects the switch 132 to the terminal FL side, and the switching circuit 110 connects the switch 132 to the terminal FL side from the switching pulse generating section 158.
32 alternately selects the signals at inputs 114 and 122 to output 1
Output to 28. Similarly, switching circuit 112 alternately selects the signals at inputs 116 and 124 and outputs them to output 130 in response to switching pulse P. switching pulse S
Since P alternates between two states and two states in each IV period, the signals of the inputs 114 and 11B are directly output to the output 128 of the switching circuit 110 and the output 130 of the switching circuit 112 in the first field. In the second field, signals from the output 122 of the delay circuit 11B and the output 124 of the delay circuit 11B, that is, a video signal delayed by 0.5H period are output. This video signal is subjected to line-sequential synchronization as described above, and is displayed on the video monitor 1 in the form of an NTSC composite video signal.
Output to 5B.

As you will see, in the field recording mode, the monitor video signal output from the device output 154 is always
It contains only the image information of one of the two fields constituting the input video signal, uses this field to create a pseudo field as a second field, and displays both fields in an interlaced manner. In other words, the image output to the video monitor 15B in the field recording mode does not include the image information of the two fields included in the original input video signal, but only includes the image information of one of the fields.

Of course, the image of one field is displayed on the video monitor 156 interlaced with the image of the pseudo field. Therefore, its resolution is basically the same as one field of video signal recorded on the magnetic disk 48, and is half of the original input video signal. In addition, the video monitor 156
The video output to the BI disc 48 does not necessarily have to be of the same field as the video signal recorded on the Bi disc 48.

In the playback mode of this device, the overall control section 86 switches the switch 3.
6.38. In the case of frame playback mode, in which 106 and 108 are connected to the terminal PB side, switch 6
4 and 132 are connected to the terminal FR side, and the regenerative amplifier 54 selectively and alternately selects its inputs 56 and 58 in response to the switching pulse SWP, amplifies this, and outputs it to the output 82. do. That is, during one field period, the video signal read by one magnetic head 42, for example, 40, and during the other field period, the video signal read by the other magnetic head 42 is output to the output 62 of the regenerative amplifier 54. .

Switching circuits 110 and 112 switch inputs 114 and 11, respectively, in response to the reference potential of switch 132.
The B signal is selected and output to outputs 128 and 130. Therefore, the composite luminance signal yes obtained from the regenerative amplifier 54 through the high-pass filter 94 and the FM demodulator 98 is transmitted from the terminal PB side of the switch 1013 to the switching circuit 110.
The signal is input to the input 114 of , passes through the switching circuit 110 and is input to the mixer 152 . Similarly, regenerative amplifier 54 to low pass filter S6 and FM demodulator 1o.

The line sequential color difference signal C obtained through the switch 108
is input to the input 116 of the switching circuit 112 from the terminal PB side of the switch circuit 112. The line-sequential color difference signal C passes through the switching circuit 112, undergoes line-sequential synchronization as described above, and is finally outputted from the device output 154 as a composite video signal. As a result, the image of the two interlaced fields is displayed as one frame on the image monitor 156.

By the way, in the field playback mode, the overall control section 86
In this case, the switches 64 and 132 are connected to the terminal FL side, and the regenerative amplifier 54 responds to the reference potential signal from the switch 64 by fixedly selecting one of its inputs, for example, 56, and amplifying it. and outputs it to the output 62.

That is, the video signal read by one of the magnetic helads 40 is output to the output 62 of the regenerative amplifier 54.

Further, the switching circuit 110 alternately selects the signals on the inputs 114 and 12 in response to the switching pulse SWP supplied through the switch 132 and outputs the selected signals on the output 128.

Similarly, switching circuit 112 alternately selects signals at inputs 116 and 124 and outputs them to output 130 in response to switching pulse SWP. The input +14 of the switching circuit 110 receives the composite luminance signal Y+S read by the magnetic head 40.
is directly input, and the composite video signal Y+S that has passed through the delay circuit 118 is input to the input 122. Therefore, at its output 128, in the first field, the signal of the input +14 is directly output, and in the second field, the output 122. That is, a signal delayed by 0.5H period is output.

Similarly, the input 11G of the switching circuit 112 directly receives the line sequential color difference signal C read by the magnetic head 40, and the input 124 receives the line sequential color difference signal C that has passed through the delay circuit 120.
is input. Therefore, its output 130 includes the first
In the field, the signal of input 118 is directly output, and the second
In the field, 0.5H of the output 124 of the delay circuit 120
A signal delayed by a period is output. This line sequential color difference signal C
are subjected to line-sequential synchronization as described above, and are output to the video monitor 15B in the form of an NTSC composite video signal together with the composite luminance signal Y+S.

Note that in the case of the reproduction mode, the FM modulators 1B and 22 stop their operations, thereby preventing noise from being mixed into the reproduction signal from the FM modulators 1B or 22.

In this field playback mode, similar to the field recording mode, the video signal output from the device output 154 is
Contains image information of a single field, and creates a pseudo field as a second field using this field,
Both fields are displayed interlaced.

Effects According to the present invention, when only one of the two fields of a field-interlaced video signal is recorded on a signal recording medium, only one field is output as the video signal for the video monitor. A video signal containing image information is formed.

Therefore, since the image displayed on the monitor device during field recording basically has the same resolution as the image recorded on the recording medium, the monitor device can appropriately grasp the state of the recording signal.

[Brief explanation of the drawing]

FIGS. 1, 2, and 3 are greasing block diagrams showing an embodiment of a video signal recording apparatus according to the present invention. Explanation of the symbols for the end portions 38.84, 108, 132. Switch 40.42.
, , ,Magnetic head 48, ,Magnetic disk 54, ,Regenerative amplifier H, ,General control section 110.134. , , , switching circuit 11B, , ,
, , , delay circuit 144, , , , , color difference signal discrimination circuit 156,
, , , , ,Video monitor 158, , , , ,
, +JJ conversion pulse generator patent applicant Fuji Photo Film Co., Ltd. Agent Takao Katori Takao Maruyama

Claims (1)

[Scope of Claims] 1. A video signal recording device that repeatedly receives a video signal of one frame representing a still image and in which two fields are interlaced scanned, and records the video signal on a signal recording medium, the device comprising: a signal input means for receiving a video signal; a recording means connected to the signal input means for recording at least one field of the video signal on the signal recording medium as a video signal representing a still image; and an image represented by the video signal. a signal output means for outputting an output signal for displaying the image; a signal control means for extracting information and applying it to the signal output means, and when the recording means records the video signal of one field, the output signal having the image information of any one of the fields is A video signal recording device characterized in that a video signal is output from a signal output means. 2. In the apparatus according to claim 1, when the recording means records the video signal of one field, the signal control means controls the signal from the video signal of any one field of the video signal. A video signal recording device characterized in that a video signal of a pseudo field is formed and the video signals of both fields are provided to the signal output means by interlaced scanning. 3. In the apparatus according to claim 1, when the recording means records one frame of the video signal, the signal control means supplies the one frame of the video signal to the signal output means. A video signal recording device characterized by: