JPS6057791A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To attain dubbing with simple operation by converting a signal into a luminance signal and a chrominance signal in an adaptor so as to transmit directly the signal to other recording and reproducing means. CONSTITUTION:In dubbing a tape between 8mm. vido devices, the output terminal of a video device for reproduction is connected to the input terminal D2 of a reproduction adaptor 2, and output terminals A2, B2 and C2 of the adaptor 2 and the input terminals of a video device for recording are connected. Changeover switches SW22, SW23 are selected to the P contact position and switches SW25, SW26 are selected to the D contact position. An inputted reproduction signal is converted into a luminance signal Y and a carrier chrominance signal fc, and they are fed to a television receiver via an adder 205. Furhter, the luminance signal Y and the carrier chrominance signal fc are outputted from the output terminals A2, B2 and C2 through a Y signal processing circuit 216 and a C signal processing circuit respectively as a luminance signal Y' and color difference signals (B-Y)' and (R-Y)'.

Description

TECHNICAL FIELD The present invention relates to a magnetic recording/reproducing device, such as a so-called 8 mm video device, which directly performs low frequency conversion of a color difference signal from a television camera and magnetically records the signal.

A conventional 8mm video device is one that integrates a television camera and a recording device using magnetic tape.
For example, if the color difference signals of RY) and (B-Y) are 7 Q Q
Direct low frequency conversion to a color signal near KH2, multiplexing with FM modulated luminance signal, recording on magnetic tape via a magnetic head, or playing back this recorded information on a TV receiver via an adapter. It is supposed to be done.

FIG. 1 shows a conventional video system of this type, in which 1 is an 8 mm video main unit, 2 is a playback adapter, and 3 is a television receiver. The first 8-millimeter video recorder can record the image information obtained by the camera 1a onto the magnetic tape 1b, and the recorded image information can be reproduced via the reproduction adapter 2 on the television receiver m3.

Figure 2 shows the structure of an 8mm video adapter 1 and playback adapter 2 that has already been filed by the applicant.The 8mm video device shown in Figure 2 has a terminal for inputting an external video signal and a terminal for inputting an external video signal. It is equipped with a signal processing circuit for recording that processes signals, and a filter that separates the video signal into a luminance signal and a color signal. This circuit is shared with the circuit, and information from an external television device can also be recorded at will on the recording section of an 8 mm video or other similar device.

In the first circuit of the 8-millimeter video camera, 101 is a camera section signal processing circuit that processes the video signal of the image obtained by the camera 1a, and the camera section signal processing circuit 101 processes the luminance signal Y and color difference signal R- of the captured image. Y.

B-Y is output. The luminance signal Y is input to the pre-emphasis circuit 102 via the changeover switch 5WII- on the regeneration P contact side and amplified to a predetermined value, then converted to a low carrier FM signal by the frequency converter 103 and sent to the adder 104. Sent out.

On the other hand, the color difference signals -Y and B-Y are sent to the encoder 1 via changeover switches 5W14 and 5W15 on the playback P contact side.
05. Further, the encoder 105 receives a low frequency signal whose phase is controlled by the horizontal synchronization signal fH of the camera signal and the head switching pulse by the low frequency generator 106. Then, the color difference signals -Y, B-Y,
In the encoder 105, this low frequency signal is converted into a low frequency converted color signal f and sent to the adder 104.

The FM-modulated luminance signal and the low-frequency-converted color signal f6 are added in an adder 104, and then amplified as an F signal in a recording aid 107, and then sent to a switch 5W1.
It is sent to the magnetic head 108 via the legend 1. A composite signal of the luminance signal and color signal sent to the magnetic head 108 is recorded on the magnetic tape 1b. When reproducing the magnetic tape 1b, the switch 5W11 is switched to the P side, and the reproduction signal is inputted from the magnetic head 108 to the preamplifier 109 via the switch 5W11, amplified, and then sent to the reproduction adapter 2.

In the circuit of the playback adapter 2, the video signal input from the first 8-millimeter video signal is sent to the high-pass filter 201, and a signal subjected to AI modulation is extracted.

When dropout occurs in this FM signal 1d, it is compensated by the dropout compensator 202, and then
The frequency demodulator 203 converts the signal into a luminance signal. This luminance signal is sent to an adder 205 after noise is suppressed by a de-emphasis circuit 204 .

On the other hand, the low-pass filter 206 extracts a low-pass converted color signal f8±df having a frequency variation ±df from the video signal. This low-pass converted color signal f6±dfil-1:,
A carrier color signal f whose phase is stable in the frequency converter 207.

After the information is converted into , the changeover switch 5w on the playback P contact side is used to eliminate crosstalk with the information of adjacent tracks.
22 to the comb-shaped filter 208, and further sent to the adder 205 via the changeover switch SW'23 on the regeneration P contact side.

The carrier color signal f whose phase is stable as described above. can be obtained as follows. First, the carrier color signal f0 that has passed through the comb-shaped filter 208 is passed through the phase comparison circuit 20 via the changeover switch 5w23 after the color burst signal is extracted.
9. The phase comparison circuit 209 connects the carrier color signal f outputted by the frequency converter 207 and the changeover switch 5w2 located on the regeneration P contact side of the 358mm standard oscillator 210.
Reference signal f outputted via 4. The phase is compared with
The voltage controlled oscillator 211 is controlled by the phase error voltage. Then, the voltage controlled oscillator 211 outputs to the frequency converter 212 a signal having a frequency fE3 which cancels out the phase error. In the frequency converter 212, the output f8±df of this controlled oscillator 211 and 3.58 h
The output f' of the a-tz reference oscillator 210 is mixed with
Frequency fs ten f.

A signal of ±df is input to the frequency converter 207. As a result, in the frequency converter 207, the output f of the converter 212
The signal f6±df that has passed through the low-pass filter 206 is extracted from 8+fo±df to obtain 3.58ME (, a carrier color signal synchronized with the output f.' of the z reference oscillator 210).

After being added to the carrier color signal f and the luminance signal Y (!) in the wide adder 205, it is sent to the television receiver 3 via the output terminal K as a video signal.

On the other hand, when recording a video signal output from an external TV tuner 214 or a video tape recorder, the first input terminals A1, B1, and CI of the 8-millimeter video tape are connected to the output terminals A2, B2, and C2 of the adapter 2, respectively. and are connected via lead wires.

Then, in adapter 2, switch 5w22.23
．． 24 is switched to the contact side for recording, and input terminal x1
．． The video signal input from x2 is sent to switch B'W2.
1.22 to the comb-shaped filter 208 and separated into a color signal and a luminance signal, this color signal is inputted to the C signal processing circuit 215 via the switch 5w23. Next, the luminance signal is input to the Y signal processing circuit 216. Then, in the Y signal processing circuit 216, the luminance signal is compensated for the delay time with the color signal, and is output as a luminance signal V to the terminal A.
1. It is output to the first 8-millimeter video camera via A2i, and also separates the horizontal synchronization signal from the luminance signal Y, and uses this horizontal synchronization signal as a burst gate pulse to the C signal processing circuit 2.
15.

Further, in the C signal processing circuit 215, a reference signal f of 358 degrees is inputted from the reference oscillator 210 via the switch 5w24. and the burst gate pulse from the Y signal processing circuit 216, the color signal is converted into a color difference signal (JL-Y),
(B - Y)' and terminals B1, B2, C1,
It is output to the first 8 mm video camera via C2.

In the 8 millimeter bidet No. 1, switches 5w13.14.
15 is switched to the recording R contact side, that is, to the adapter 2, and the luminance signal V is input from the Y signal processing circuit 216 to the pre-emphasis circuit 102 via the switch 5W13. It's a moat, color difference signal (RY) (, B + Y)'
However, from the C signal processing circuit 215 to the switch 5w14.15
is input to the encoder 105 via.

The low frequency generator 108 inputs to the encoder 105 a low frequency signal whose phase is controlled by the horizontal synchronizing signal from the synchronization separation circuit 110 and the head switching pulse.

Then, in the encoder 105, the color difference signals (R-Y) and (B-Y) from the adapter 2 are converted into a color signal f8' which is low-frequency converted based on this low frequency signal.

Thereafter, in the same manner as the signal from the camera section signal processing circuit 101 is processed, the luminance signal V and the low frequency converted color signal f8' are processed and recorded on the magnetic tape 1b.

In addition, switches 5w21 to SW23 and 8W13
-5W16 are configured to be switched in conjunction with each other when a television tuner 214, video tape recorder plug, or the like is inserted into the input terminals X1 and X2 of the adapter 2 from the outside. Alternatively, it is configured to work in conjunction with a single changeover switch provided on the outside of the device body.In this way, the 8mm video device already filed by the present applicant converts the video signal from the outside into the luminance signal. If the adapter is equipped with a circuit that converts the camera signal into a color difference signal, it is possible to record external video signals other than the camera signal into, for example, an 8 mm video recording unit via this adapter. . Further, the adapter is provided with a switch means for switching the filter means for separating the luminance signal and the chrominance signal, and this filter means can be used both for recording external video signals and for recording and reproducing camera signals.

By the way, in the above-mentioned 8mm video device, when dubbing a magnetic tape between one 8mm video,
As shown in FIG. 3, the output terminal D1 for the first reproduction signal of the 8-millimeter video for IC1 reproduction is connected to the reproduction signal input terminal D2 of the reproduction adapter 2. 1, connect the video signal output terminal K of playback adapter 2 to the external input terminal X1 of another playback adapter 2.
and TV receiver 3. ! - Finally, connect the output terminals A2, B2, and C2 of the playback adapter 2 to the input terminals A1, B1, and C1 of the 8-millimeter video recorder 1', respectively. Then, the changeover switch of the adapter 2 on the reproduction side is turned to the play P side, and the changeover switch of the adapter 2 on the recording side is turned to the recording hole side.

Then, the 8-millimeter video first magnetic tape for reproduction 1b is reproduced, and the reproduced signal is input to the adapter 2. In adapter 2, the playback signal is transferred to F as described above.
After being separated into the M signal and the low frequency exchanged color signal, the F
The M signal is demodulated into a luminance signal, the low frequency converted color signal is frequency-converted into a carrier color signal, and the luminance signal and the carrier color signal are combined into a standard NTSC color signal in an adder 205, and a terminal K is output. Addafuri 2 on the recording side as a video signal
input terminal X1 and the television receiver 3. The television receiver 3 reproduces this video signal into an image and monitors the dubbed image.

In the adapter 2, this video signal is again separated into a luminance signal and a chrominance signal by a comb-shaped filter 20B, and the luminance signal is compensated by a Y signal processing circuit 216 and input to 8 mm videotet 1'. The signal is converted into a color difference signal by a C signal processing circuit 215 and inputted to the first 8 mm video recorder.

In the first 8-millimeter video tape, the luminance signal and the color difference signal are combined and recorded on the recording magnetic tape 1'b.

In this way, when dubbing between 8mm videos, the above-mentioned 8mm video device combines the luminance signal and chrominance signal obtained by separating the reproduced signal into a standard NTSC video signal, and then combines it again. Since the luminance signal and color signal are separated and recorded again, signal deterioration occurs in this process. moreover,
This method has the disadvantage that two adapters are required and the dubbing operation becomes complicated.

Purpose This invention was made in order to solve the above-mentioned problem, and it is an object of the present invention to perform a simple dubbing operation using only one playback adapter in this type of 8mm video or a similar type of magnetic recording/playback device. An object of the present invention is to provide a magnetic recording/reproducing device capable of dubbing between 8 mm videos without deteriorating image quality due to signal deterioration.

Configuration The configuration of the present invention will be explained below along with an embodiment shown in FIG. In Fig. 4, the same parts as in Fig. 2 are given the same numbers.
is the selector switch 5w on the playback adapter 2 shown in Figure 2.
25,5w26 is added, and the changeover switch SW24 for the 3.58MHz oscillator is removed.

The D contact for dubbing of the changeover switch 5w25 is connected to the output terminal of the de-emphasis circuit 204.
The R contact for recording of switch 5V25 is comb-shaped filter 2.
It is connected to the output terminal of 08.

Further, the common terminal of the switch 5w25 is connected to the Y signal processing circuit 216. And TV tuner 214
When recording a video signal input from, for example, the switch 5w25 is on the R contact side, and the luminance signal separated from this video signal by the comb filter 208 is input to the Y signal processing circuit 216.

On the other hand, when dubbing is to be performed between two 8-millimeter video cameras, the switch 5W25 is switched to the D contact side, and the separated luminance signal is transmitted from the reproduced signal input from the 8-millimeter video video camera 1 for reproduction. Y from de-emphasis circuit 204
The signal is input to the signal processing circuit 216.

The D contact of changeover switch 8W26 is changeover switch 5W23.
The P contact of the switch 8W26 is connected to the P contact for regeneration, and the P contact of the switch 8W26 is not connected to anything. Also, switch 5w26
The common terminal of is connected to the C signal processing circuit 2150 input terminal. When recording from the TV tuner 214 or the like, the switch 5W23 and the switch 5w25 are on the contact side, and the video signal from the TV tuner 214 and the color signal separated by the square filter 208 are sent to the C signal processing circuit 215. is input. on the other hand,
When dubbing between 8mm video tape 1, switch s
, w22 and 5W23 are on the P contact side, and switch 5
w26 is on the D contact side, and the color signal separated from the reproduced signal from the first 8 mm video is sent from the frequency converter 207 to the switch 5W22, the comb filter 208, and the switch 5w2.
The signal is input to the C signal processing circuit 215 via 3 and 5W26.

The changeover switches 5w25 and 5w26 are interlocked with switches provided outside the main body of the adapter 2, and switching thereof is performed manually.

The output terminal of the 3.58 MHz oscillator 210 is connected to the frequency converter 212, the phase comparison circuit 209, and the C signal processing circuit 21.
5. and a subcolor carrier signal f. ' is the low-frequency converted color signal f in the reproduced signal from the first 8-millimeter video
8 upper df is the phase stable color signal f. 358 MI (2 oscillators 210 to phase comparator circuit 2
09 and frequency converter 207. Also, a sub-color carrier signal f. For example, it is also input to the C signal processing circuit 215 as a reference signal for converting a color signal into a color difference signal.

When dubbing between 8mm videos using the playback adapter 2 with the above configuration, the first output terminal D1 of the 8mm video for playback and the input terminal D2 of the playback adapter 2 shown in FIG. Connected via wire. Further, the output terminals A2, B2, and C2 of the playback adapter 2 shown in FIG.
The television receiver 3 is connected to the output terminal of the television receiver 3.

First, the magnetic tape 1b attached to the first 8-millimeter video tape for playback is played back by the magnetic head 108, and the reproduced signal is sent from the output terminal D1 of the first 8-millimeter video tape to the input terminal D2 of the playback adapter 2 shown in FIG. Ru.

In the playback adapter 2, selector switch 5M22.5
w23 is switched to the P contact side, and the selector switch 8W2
5. S'W26 is switched to the D contact side. The input reproduced signal is then sent to a high-pass filter 201 to extract an FM signal, which is input to a frequency demodulator 203 via a dropout compensator 202 and converted into a luminance signal. be done. This luminance signal is input to the Y signal processing circuit 216 via the switch 5W25, and is also input to the adder 205.

On the other hand, a low-pass converted color signal fs±clf is extracted from the reproduced signal input to the low-pass filter 206, and after being converted into a carrier color signal f0 by the frequency converter 207,
The signal is input to the comb filter 208 via the switch 5W22. This carrier color signal f. , comb-shaped filter 208
After extracting the color burst signal, it is sent to the adder 205 via the switch 5W23, and
Further, the luminance signal and color signal input to the adder 205 via the switch 5W26 are combined with a standard NTSC video signal, and sent to the television receiver 3 via the output terminal K, where it is reproduced as an image.

On the other hand, the Y signal processing circuit 21
The luminance signal input to the 8-millimeter video recorder 6 has its delay time compensated for and is sent from the output terminal A2 to the input terminal A1 of the 8-millimeter video recorder 1'.

The color signal inputted to the C signal processing circuit 215 is converted into a color difference signal (B-Y)'(R-Y)' and output to the output terminals B2, C2 and the first 8-millimeter video signal for recording. Input terminal B
1, sent to C1.

The luminance signal and color difference signal input to the 8-millimeter video recorder 1' are subjected to signal processing as described above, and then sent to the adder 10.
4 is combined into a video signal.

This video signal is recorded on the magnetic tape 1b attached to the 8-millimeter video tape 1'.

In this way, in the above-described embodiment, if two 8-millimeter video firsts are connected via one playback adapter 2, dubbing can be performed between the two 8-millimeter video firsts. In addition, within the playback adapter 2, the playback signal from the first 8mm video tape for playback is separated into a luminance signal and a color signal, and then the brightness signal and color signal are input to the first 8mm video tape for recording while being separated. Therefore, signal deterioration is reduced.

Effects As described in detail above, according to the present invention, in a magnetic recording/reproducing device that directly converts and records the color signal of a television camera in low frequency range, the magnetic recording/reproducing means and the external television device are connected. , a reproduction conversion means for converting a reproduction signal from the magnetic recording and reproduction means into a signal for an external television device, and a recording conversion means for converting a signal of the external television device into a signal for the magnetic recording and reproduction means. The adapter is further equipped with a switching means having a switching position for dubbing, and after converting into a luminance signal and a color signal within the adapter, the luminance signal and color signal are directly transferred to another magnetic field. Since the data can be sent to the recording and reproducing means for recording, dubbing can be performed with a simple operation using a single adapter, and signal deterioration during dubbing is reduced, so that no deterioration in video image quality occurs due to dubbing.

[Brief explanation of drawings]

Figure 1 is a plan view showing the outline of a conventional 8mm video device;
FIG. 2 is a block diagram showing a conventional 8 mm video device and a playback adapter, and FIG. 3 is a block diagram showing a conventional 8 mm video device and a playback adapter.
FIG. 4 is a plan view showing a system for dubbing between milli-videos and a block diagram showing an embodiment of the present invention. 1-8 mm video, 2...adapter, Xl, ...3.58 Bfl (z reference oscillator, 5W22, 5W23.5w25, s w 26.
8W13~5W16...Selector switch. Patent Applicant Ricoh Co., Ltd. Agent Mr. Aoyama Hogai 1 October 20, 1981 Director General of the Japan Patent Office 14 Indication of Case 1988 Patent Application No. 166303 2 Name of Invention Magnetic Recording and Reproducing Device 3, Person Making Amendment Relationship to the case Patent applicant address: 3-3, Nakamagome 1-chome, Ota-ku, Tokyo (674
) Riko Co., Ltd. Representative: Hama 1) ``Date of amendment order for Embryo 4 Proxy 5: Voluntary 7, Contents of amendment (1) Specification Section, page 17, line 16, 1-Video'' has been replaced with ``Record'' Corrected to "R-do". (2) On page 17, line 17 of the same page, replace "video signal" with r
RF signal”.

Claims (1)

[Claims] (1) In a magnetic reproducing device that directly converts and records color signals from a television camera, the magnetic recording and reproducing means is connected to an external television device, and the reproduction signal from the magnetic recording and reproducing means is transmitted to the external television. A switching means having a switching position for dubbing in an adapter comprising a reproduction conversion means for converting a signal for the apparatus and a recording conversion means for converting a signal of an external television apparatus into a signal for the magnetic recording and reproduction means. A magnetic recording and reproducing apparatus, further comprising: a circuit for transmitting a luminance signal and a color signal to another magnetic recording and reproducing means via the switching means during dubbing.