JPS63311884A - Picture dubbing device - Google Patents

Abstract

PURPOSE:To decrease the deterioration in the picture quality even when a character or the like is superimposed on a picture to be dubbed by selecting a modulation video signal and a signal in the modulation frequency band of a modulation video signal outputted from a signal generating means so as to be recorded onto the 2nd recording medium. CONSTITUTION:A modulation video signal recorded on the 1st recording medium 2 is reproduced by a reproducing means 1 and a signal in the modulation frequency band of the modulation video signal outputted from signal generating means 30, 32 is inputted to selection means 12, 20, the modulation video signal is inputted to a synchronizing signal detection means 34, from which a synchronizing signal is detected. The synchronizing signal from the synchronizing signal detection means 34 is given to a control means 38 to control the selection means 12, 20 in the timing based on the synchronizing signal and the output signal is inputted to the recording means 3 synchronously with the drive of the 1st recording medium 2 to be recorded onto the 2nd recording medium 2. The signal representing the picture information is superimposed on the modulation video signal recorded on the 1st recording medium 2 without demodulation and the result is dubbed onto the 2nd recording medium 2 in this way, the deterioration of the picture quality of the dubbing picture is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an image dubbing device, and particularly to an image dubbing device having an image information adding function.

[Conventional technology]

Recently, with the arrival of the age of nine media, various AV (
(audio/visual) products have been developed and put into practical use. Among these AV products, image recording and reproducing devices that use magnetic recording media such as magnetic sheets or magnetic tapes, which can easily record, reproduce, and erase images repeatedly and are inexpensive, have been put into practical use. . In addition, images recorded on magnetic recording media by such devices are
At the same time, an image dubbing device for dubbing a composite image superimposed with another image such as characters indicating image information onto another magnetic recording medium has also been developed and put into practical use.

Incidentally, in such an apparatus, a video signal corresponding to one frame of an image is sequentially recorded on one of a plurality of tracks formed on a magnetic recording medium. Further, such devices usually employ a method of recording video signals by frequency modulation (FM). As a result, even if the recording level of the video signal changes slightly due to poor contact between the magnetic recording medium and the magnetic head when recording the video signal, the recorded video signal can be reproduced through the limiter. That effect is now being removed.

Therefore, in a normal image dubbing device, when superimposing another image, such as characters indicating image information, on the dubbed image, the FM video signal corresponding to the dubbed image of -frame is demodulated once to the baseband. The restored video signal and a baseband video signal representing images such as characters are combined, and the video signal obtained by combining these two signals is FM-modulated and recorded.

[Problem that the invention seeks to solve]

However, in the above image dubbing apparatus, when the FM video signal corresponding to the dubbed image is demodulated into a baseband video signal, the S/N and frequency characteristics deteriorate. Also, when this baseband video signal is combined with a baseband video signal representing another image and modulated, the S/N, frequency characteristics, etc. deteriorate as in the case of demodulation, resulting in the quality of the dubbed image. decreases.

In view of the above-mentioned problems of the conventional technology, the present invention provides an image dubbing device in which the image quality of the dubbed image is minimally degraded even when another image such as characters indicating image information is superimposed on the dubbed image. It is intended to.

[Means for solving problems]

In order to achieve the above-mentioned object, an image dubbing apparatus of the present invention reads out a modulated video signal from a first recording medium on which the modulated video signal is recorded and records it on a second recording medium. a reproducing means for driving a first recording medium and reading out the modulated video signal from the first recording medium; a synchronizing signal detecting means for detecting a synchronizing signal based on the modulated video signal from the reproducing means; a signal generating means for generating a signal within the wrinkle frequency band; a selecting means for selecting a signal from the signal generating means or a modulated video signal from the reproducing means; and a first recording of the output signal from the selecting means. A recording means for recording on a second recording medium in synchronization with the drive of the medium; and a synchronizing signal from the synchronizing signal detecting means, controlling the selecting means at a timing based on the synchronizing signal, and recording from the reproducing means. A control means for inputting a modulated video signal or a signal from the signal generation means to the recording means.

[Operation] According to the present invention, the modulated video signal recorded on the first recording medium is reproduced by the reproducing means, and the reproduced signal and the signal within the modulation frequency band of the modulated video signal output from the signal generating means are combined. is manually selected. Further, the modulated video signal is input to a synchronization signal detection means, and a synchronization signal is detected.

The synchronization signal from the synchronization signal detection means is input to the control means, and the control means controls the selection means at a timing based on the synchronization signal, so that the output signal from the selection means is synchronized with the driving of the first recording medium. The information is recorded on the second recording medium by manual input by a recording means that drives the second recording medium.

In this way, since the modulated video signal recorded on the first recording medium is superimposed with a signal indicating image information on this signal without demodulating and is dubbed onto the second recording medium, the quality of the dubbed image is The reduction in image quality is small.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of an image dubbing apparatus according to the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 shows a circuit block diagram of the overall configuration of an image dubbing apparatus according to the present invention. In FIG. 1, the image dubbing device includes a playback function unit that plays back an FM video signal representing an image recorded on a magnetic recording medium such as a magnetic disk, and a recording function unit that records the reproduced FM video signal on another magnetic recording medium. It is composed of.

In the device of this embodiment, each functional section is provided with deck sections 1 and 3, and each deck section 1.3 has a DC motor 48A.
The magnetic recording medium 2, such as a magnetic disk, is removably attached to the rotating shafts 48A and 74Δ of 74 and 74, respectively.

The magnetic disk 2 has a magnetic recording material track with a diameter of approximately 50 μm, and a plurality of, for example, 50 recording tracks are arranged concentrically at a predetermined pitch (for example, approximately 100 μm) on its recording surface.
) is formed. In this embodiment, F and M video signals obtained by FM modulating the luminance signal Y and the chroma signal C are recorded on the recording track. This FM video signal is
For example, 1 which forms one frame of image by rask scanning.
The FM video signal of the field is recorded on one track.

Of the FM video signals, the FM luminance signal YFi, including the synchronization signal S, is modulated using a high frequency band of 2.5MH7 or higher. As shown in Fig. 2, the signal band spectrum is centered at 7 MHz, with the sync tip level 90 at 5 MHz, and the white peak level 92 at 7°5.
Each is set to MHz. The frequency bandwidth is approximately 2
．． The frequency is 5 to 10 MHz. On the other hand, the FM chroma signal CF)I uses the lower frequency band below
As shown in FIG.
has a center frequency of approximately 1.2 MHz, and that of the color difference signal B-Y has a center frequency of approximately 1.3 MHz. Frequency bandwidth is approximately 0.15~2
．． It is set to 5MHz. Figure 3 shows the FM chroma signal CF.
The signal band characteristics of X are shown. Each color signal (yellow, cyan, green,
magenta, red, blue) are respectively included in the modulation signal of the color difference signal R-YSB-Y. For example, the color signal 93 indicating yellow is set to have a frequency band of approximately 1.26 MHz in the signal band of the color difference signal RY, and a frequency band of approximately 1.05 MHz in the signal band of the color difference signal B-Y. The color difference signals are line-sequenced so that two types of signals are alternately scanned every horizontal scanning line.

The DC motors 48,74 each have an AC frequency signal generator 50,76 that generates an AC frequency signal FG as the DC motors rotate. Further, the DC motors 48.74 are supplied with power from motor drive circuits 42.72 respectively controlled by servo circuits 40.70, so that the magnetic disk 2 is rotated at a constant speed of a predetermined rotational speed, for example, 3.60 rpm. Servo controlled. The servo circuits 40 and 70 are controlled by a control device 38 to drive and stop the magnetic disk 20, and are supplied with an AC frequency signal FG from an AC frequency signal generator 50.76 and a phase synchronization signal from a synchronization separation circuit 34, which will be described later. be done. Note that the phase synchronization signal may be generated from the magnetic disk 2.

In this case, the phase synchronization signal is transmitted to each core 52 of the magnetic disk 2.
．． The phase signal detectors PG39, 69 detect the timing marks provided at the servo circuits 42, 78, respectively.

A magnetic disk 2 on which an FM video signal has been recorded is loaded into the reproduction deck section 1. A magnetic transducer, that is, a magnetic helad 4 is disposed facing the recording surface of the magnetic disk 2. The magnetic head 4 is operated by a step motor 46.
It is transported in the radial direction R along the recording surface of the magnetic disk 2 under trap king servo control. The step motor 46 is rotationally driven by a drive pulse supplied from the motor drive circuit 44. Motor drive circuit 44 generates drive pulses according to an excitation pattern instructed by control device 38 . This apparatus is configured so that an arbitrary track on the recording surface can be selected by operating an operating section 43 connected to the control device 38.

The magnetic head 4 has a reproduction function of detecting an FM video signal from tracks already recorded on the recording surface and converting it into a corresponding electric signal. As mentioned above, in this embodiment, the magnetic disk 2 is rotated at a constant speed of 3.600 rpm, so 1/
The FM video signal for one track, that is, the FM video signal for one field, is reproduced via the magnetic head 4 every 60 seconds.

The FM video signal from the magnetic head 4 is amplified to a predetermined level by a reproduction amplifier 6, and then passed through a high-pass filter (HP
F) 8 and a low pass filter (LPF) 16.

The high-pass filter 8 has a frequency characteristic that allows signals with a frequency of about 2.5M82 or higher to pass through, thereby allowing the FM
The FM luminance signal (y+5)px is separated from the video signal. FM brightness signal (Y+S) FM is supplied to FM demodulation circuit 33 and limiter (LIM>10. FM demodulation circuit 1
The luminance signal Y+S demodulated by 0 is sent to the synchronization separation circuit 3.
4 is input.

The synchronization separation circuit 34 is a circuit that separates a vertical synchronization signal VD and a horizontal synchronization signal HD from the luminance signal Y+S and supplies them to the CR7 circuit 36. The vertical synchronization signal VD is also supplied to the servo circuit 40.70 as a phase synchronization signal V17++c.

On the other hand, the FM luminance signal (Y+5) Fil whose level is limited to a predetermined value by the limiter 10 is supplied to the contact a side of the selection switch 12. Further, an output signal from an oscillator 30 is supplied to the contact side of the selection switch 12. The oscillator 30 is a circuit that generates a signal T that includes CO and the like and has the same frequency range as the FM luminance signal YFX, and its output frequency and signal level can be adjusted.

The low-pass filter 16 has a frequency characteristic that allows signals with a frequency of about 2.5 MHz or less to pass, and thus the F
An FM chroma signal CFM is separated from the M video signal. F
The M chroma signal C□ is level-limited to a predetermined value by a limiter (LIM) 18 and is supplied to the contact a side of the selection switch 20. Further, the output signal T from the oscillator 32 is connected to the contact side of the selection switch 20. is supplied. Oscillator 32
includes two vco, , vco□, etc., and the FM chroma signal C
A circuit that generates a signal T0 in the same frequency range as I,
Its output frequency and signal level can be adjusted. This signal Tc is a color difference signal RY.

It is formed by two signals from V COr and V COa corresponding to B-Y.

Note that by controlling the oscillators 30 and 32 at predetermined timings, it is possible to generate signals corresponding to characters such as letters.

The CR7 circuit 36 is controlled by a control device 38 and outputs a switch signal 35 that switches and operates the selection switch 12.20 based on the synchronization signals VD and HD from the synchronization separation circuit 34.

The output signal from the selection switch 12 is sent to the f (frequency) characteristic correction circuit i4 and the FM demodulator 56.
The output signal from the f-characteristic correction circuit 22 and the FM demodulator 6
0 are each manually powered. The f-characteristic correction circuit 14 adjusts the amplitude and phase of the FM luminance signal Y selected by the selection switch 12 or the output signal Tv from the oscillator 30 to f.
The characteristic correction circuit 22 uses the FM chroma signal C0 selected by the selection switch 20 or the output signal T from the oscillator 32.
. This circuit compensates for the amplitude and phase of the signal so that they are approximately constant regardless of the frequency.

Each output signal from the f-characteristic correction circuit 14.22 is input to a mixer 24, respectively. The mixer 24 mixes the two types of signals to create an FM video signal for recording, and supplies it to the contact a side of the changeover switch 26. Further, the contact side of the changeover switch 26 is grounded. Changeover switch 26
The switch operates to switch from the contact side to the contact a side by IV (V is one vertical scanning period) in response to the switch signal 25 from the control device 38, and the FM of the l field is switched from the contact side to the contact a side.
The video signal is input to the recording amplifier 27.

The recording amplifier 27 amplifies the FM video signal to a predetermined level and supplies it to the magnetic head 28.

As a result, one field of FM video signal is recorded on one track on the magnetic disk 2 of the recording deck section 3.

A magnetic head 28 is arranged to face the recording surface of the magnetic disk 2. The magnetic head 28 is a step motor 84
is transported in the radial direction R along the 88 recording surface. The step motor 84 is rotationally driven by a drive pulse supplied from the motor drive circuit 82. Motor drive circuit 82 is controlled! ! A driving pulse is generated according to the excitation pattern instructed by the I device 38.

The servo circuit 70 that servo-controls the DC motor 74 receives a phase synchronization signal v sy from the synchronization separation circuit 34 . receive. The DC motor 74 is servo-locked based on a phase synchronization signal (PG) obtained by detecting a timing mark provided on the core 78 of the magnetic disk 2. In this embodiment, the servo circuit 70 receives a phase synchronization signal V.
syn. Based on this, the magnetic disk 2 of the recording deck section 3 is rotated in synchronization with the magnetic disk 2 of the reproducing deck section 1.

The FM demodulator 56 demodulates the FM luminance signal Y, and outputs it to a high-pass filter (HPF) 58. Demodulated luminance signal Y
is input to mixer 68 through high-pass filter 58 .

The high-pass filter 58 has frequency characteristics that allow signals of approximately 5 MHz or higher to pass.

The FM demodulator 60 demodulates the FM chroma signal cry and outputs it to a low pass filter (LPF) 62. The demodulated chroma signal C is input to a mixer 68 through a low-pass filter 62, a synchronization circuit 64, and an encoder 66. The low-pass filter 62 has frequency characteristics that allow signals of approximately IMHz or less to pass. The synchronization circuit 64 synchronizes the line-sequential chroma signals, and the encoder 66 is a circuit that creates the synchronized chroma signal C into a chroma signal suitable for so-called interlaced scanning.

The mixer 68 creates a standard composite color television video signal (hereinafter referred to as a color video signal) based on the luminance signal Y and the chroma signal C, for example, based on the NTSC system. The color video signal from the mixer 68 is sent to the monitor television 8.
6 and the video signal output terminal T1. A monitor television 86 displays the dubbed image on a monitor based on the color video signal.

The control device 38 is a control device that controls the playback and recording function sections of the present device in accordance with the operation of the operation section 43, and is constituted by, for example, a microprocessor.

Next, load the recorded disc 2 into the playback deck section 1,
The operation when loading an unrecorded magnetic disk 2 into the recording deck section 3 and dubbing from the former to the latter will be described.

First, when the operation section 43 is operated to instruct dubbing, the control device 38 controls the motor drive circuit 82 to move the magnetic head 28 onto an empty track on the magnetic disk 2 of the recording deck section 3. The DC motor 74 is connected to the servo circuit 70
The DC motor 48 rotates at a steady speed under the control of the servo circuit 40 , and the DC motor 48 rotates in synchronization with the DC motor 74 under the control of the servo circuit 40 .

Then, when the user further releases the operating section 43 to instruct the start of dubbing, the control device 38 controls the magnetic head 28 of the recording deck section 3 to place it on the first track on the recording surface.

For example, the FM video signal reproduced from the first track by the magnetic head 4 passes through the reproduction amplifier 6, and then is passed through the high-pass filter 8 and the low-pass filter 16 to the FM luminance signal (Y+
5) Separated into Fll and FM chroma signal C4, .

The FMtiliary signal YFX is demodulated by the FM demodulation circuit 33 and sent to the sync separation circuit 34. The synchronization separation circuit 34 and the CRT circuit 36 receive a synchronization signal VD.

) 10, and a synchronizing signal v is output to the control device 38, respectively. Also, the FM luminance signal (Y+S) passes through the limiter 10 to the contact a side of the selection switch 12, and the FM chroma signal CFX passes through the limiter 18 to the selection switch 22.
are respectively supplied to the contact a side of.

Here, when the control device 38 is instructed to superimpose another image (insertion image) such as characters indicating image information at a predetermined position of the dubbing image via the operation unit 43, the control device 38 controls the insertion image. The oscillators 30 and 32 are controlled respectively so that video signals corresponding to the oscillators 30 and 32 are obtained. As a result, from the oscillator 30 to the contact side of the selection switch 12, the FM
A signal Ty having the same quality as the luminance signal YF is supplied. on the other hand,
A signal Tc having the same quality as the chroma signal CFM is supplied from the oscillator 32 to the contact side of the selection switch 20. The control device 38 also controls the display position of the inserted image on the CRT circuit 36.
to be transmitted. Based on the synchronization signal VD, )10 from the synchronization separation circuit 34, the CRT time''!36 inserts the image 10 into the reproduced image from the reproduction deck l side as shown in FIG.
0 is displayed at a predetermined position on the display screen of the monitor television 86.
Performs control to switch from the contact side to the contact side. In this example, the switching operation of the selection switch 12.20 is performed for each of the second to fourth scans (Al to A4, B+ ~B4), a case is shown in which the process is performed for a period T corresponding to the display screen position a to b. As a result, the period T
An insert image 100 based on the signal 102A of the color video signal 102 is displayed for each scan. Further, at this time, the brightness can be changed by adjusting the amplitude level of the output signal T of the oscillator 30, and the color can be changed by adjusting the frequency of the output signal of the oscillator 32. For example, insert image 100
When changing the 0 color from yellow to red, refer to the color vector diagram of the color difference signal R-YSB-Y shown in FIG.
The oscillation frequency of VC○1 of the oscillator 30 may be adjusted from 1.26 MHz to approximately 1.55 MHz, and the oscillation frequency of VCOh may be adjusted from 1.05 MHz to approximately 1.33 MHz. As a result, each oscillator 3
Each color signal equivalent to the color difference signals R-Y and B-Y can be generated from 0.32. Thus the oscillator 30.3
2 and selection switches 12 and 20, it is possible to insert image information such as predetermined color characters into the dubbed image. Furthermore, it is also possible to insert not only color characters but also color pictures.

The output signals from the selection switches 12.20 each pass through an f-characteristic correction circuit 14.22, are mixed by a mixer 24, and are supplied to a changeover switch 26.

The control device 38 controls the changeover switch 26 to switch to the contact a side by 1■ at an appropriate timing in synchronization with the rotation of the magnetic disk 2 of the recording deck section 3, so that the FM video R4N is switched. The signal is supplied to the magnetic head 28 through a recording amplifier 27. As a result, the FM video signal for one field is transferred to the magnetic disk 2 of the recording deck section 3.
recorded on one track.

When dubbing for one track is completed, the control device 38 controls the step motor 4 of the corresponding deck section 1.3.
6.84 respectively to advance one track on both magnetic disks 2. In this way, by sequentially performing this for each track of the magnetic disk 2 of the reproduction deck section 1, the FM recorded on the magnetic disk 2 of the reproduction deck 1 is
Video signals are sequentially recorded on the unrecorded magnetic disk 2 of the recording deck section 3, and dubbing is performed.

Further, the output signal from the selection switch 12 is sent to the FMI adjuster 56.
and is input to a mixer 68 through a high-pass filter 58;
On the other hand, the output signal from the selection switch 20 is transmitted to the FM demodulator 6.
0, low-pass filter 62, simultaneous circuit and encoder 66
A color video signal is created by inputting the signal through the mixer 68. The color video signal is supplied to the monitor television 86 and the video signal output terminal T7, and the dubbed image is displayed on the monitor television 86.

In addition, the image dubbing device of this example! Although the device has a configuration in which a recording function section and a reproduction function section are provided, the present invention is not limited to this, and each function section may be configured by a separate reproduction device and recording device. In this case, for example, the playback device includes an analog switch 12.20 and an f-characteristic correction circuit 14.2 so that each signal from the playback function section is output to a separate recording device.
An output connector for the FM video signal is provided at the output end of either the mixer 2 or the mixer 24. Also, the synchronization signal H3 from the synchronization separation circuit 34 of the control system of the playback function section. , and an output connector for outputting 31 control signals from the control device 38. On the other hand, the recorder side is equipped with a manual connector for manually inputting each signal from the playback machine side.
A control device having the same functions as the player side is provided.

This control device is configured to be capable of self-propelled control and external control.

In this way, in this embodiment, when dubbing an image recorded on the magnetic disk 2 on the playback deck 1 side to the magnetic disk 2 of the three recording decks, image information is added to the non-demodulated soft-tone playback FM video signal representing the image. The configuration is such that a signal corresponding to a character or the like indicating a message is inserted. Thereby, it is possible to suppress deterioration of the S/N and frequency characteristics of the FM video signal indicating the dubbed image. In addition, by separating the FM video signal into an FM luminance signal YFN and an FM chroma signal C□ and inserting a predetermined signal into each FM signal,
It is possible to individually adjust the brightness and color of the image without significantly reducing the S/N and frequency characteristics of the dubbed image.

〔Effect of the invention〕

As explained above, according to the image dubbing device according to the present invention, the image dubbing device reads out a modulated video signal from a first recording medium on which the modulated video signal is recorded and records it on a second recording medium. The modulated video signal reproduced from the first magnetic recording medium and the signal within the modulation frequency band of the modulated video signal output from the signal generating means are selected and recorded on the second recording medium. , it is possible to insert a signal indicating another image such as a character into a modulated video signal that is not demodulated. As a result, even if characters or the like are superimposed on the image to be dubbed, the image quality of the dubbed image is not significantly degraded.

[Brief explanation of drawings]

FIG. 1 is a circuit block diagram showing the overall configuration of an image dubbing device according to the present invention, FIG. 2 is a characteristic diagram showing the band spectrum of the FM video signal, FIG. 3 is an explanatory diagram showing the signal frequency of the chroma signal, and FIG. FIG. 4 is an explanatory diagram of superimposition, and FIG. 5 is a vector diagram showing chroma signals. 1... Playback deck, 2... Magnetic disk, 3.
...recording deck, 4.28...magnetic head, 8.
58...High-pass filter, 12.20.26...
Switch, 10.18...Limiter, 14.
22... f characteristic correction circuit, 16.62... low pass filter, 24.68... mixer, 30.32...
Oscillator, 34...Synchronization separation circuit, 36...CRT
Circuit, 38...control device.

Claims (1)

[Scope of Claims] An image dubbing device that reads a modulated video signal from a first recording medium on which the modulated video signal is recorded and records it on a second recording medium, comprising: driving the first recording medium; reproduction means for reading out the modulated video signal from a recording medium; synchronization signal detection means for detecting a synchronization signal based on the modulation video signal from the reproduction means; and a signal for generating a signal within the modulation frequency band of the modulation video signal. a generating means; a selecting means for selecting a signal from the signal generating means or a modulated video signal from the reproducing means; and a second recording of the output signal from the selecting means in synchronization with driving of the first recording medium. a recording means for recording on a medium; a synchronizing signal from the synchronizing signal detecting means; and controlling the selecting means at a timing based on the synchronizing signal so that the modulated video signal from the reproducing means or the signal from the signal generating means is An image dubbing device comprising: a control means for controlling input to a recording means;