KR910003613Y1 - Two image signal recording device for vtr - Google Patents

Abstract

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Description

Simultaneous recording device of two video signals of video recorder

1 is a circuit diagram of a conventional recording apparatus.

2 is a diagram showing a track of a video tape on which a video signal is recorded by a conventional recording apparatus.

3 is a circuit diagram of a synchronous recording device of the present invention.

4a-c is an explanatory view showing a state in which the image head is installed by the simultaneous recording apparatus of the present invention, (a) is a plan view of the head drum is installed, (b) is an exploded view of the image head, (c) Front view showing the easy-mouse angle of the image head.

5 is an explanatory diagram showing a track of a video tape on which two video signals are recorded by a simultaneous recording apparatus of the present invention.

Fig. 6a-j is a waveform diagram of each part of Fig. 3;

* Explanation of symbols for main parts of the drawings

10, 20: recorder 31, 32: synchronous separator

33: gate array unit 34: analog / digital converter

35, 36: field memory 37: digital / analog converter

41: Head drum SW ₁₁ , SW ₁₂ , SW ₂₁ , SW ₂₂ , SW ₃₁ , SW ₃₂ : Switch

CH ₁₁ , CH ₁₂ , CH ₂₁ , CH ₂₂ : Image head

The present invention is a video recording player that records and plays back video signals while helically tracing video heads onto a video tape, wherein four video heads are installed on the head drum while maintaining an angle of 90 ° to each other. The present invention relates to an apparatus for simultaneously recording two video signals of a video recording and reproducing apparatus by applying two different video signals to a head to simultaneously record two video signals on a video tape.

In the conventional recording apparatus, the image signal VS inputted as shown in FIG. 1 is passed through the automatic gain controller 11, the low pass filter 12, the pre-emphasis 13, the frequency modulator 14, and the color signal passing. Through the recorder 10 of the filter 15, the color signal low-frequency converter 16, the mixer 17, and the recording amplifier 18, and through the recording / playback switch (SW ₁ ) (SW ₂ ) ₁ ) is applied to (CH ₂ ) and recorded on the videotape. When the video signal is reproduced, the video signal detected by the videotape (CH ₁ ) (CH ₂ ) through the videotape is switched through the switch (SW ₁ ) (SW ₂ ). It was inputted into a regeneration system and reproduced.

In more detail, when an image signal VS to be recorded on a video tape is input, the gain is constantly adjusted through the automatic gain controller 11 and the signal whose gain is adjusted. The luminance signal is passed through the low pass filter 12, the high frequency portion is emphasized through the pre-emphasis 13, frequency-modulated by the frequency modulator 14 and input to the mixer 17, the automatic gain controller 11 The color signal is output to the color signal through the color signal pass filter 15, the color signal low-frequency converter 16 is converted to a low-frequency signal and input to the mixer 17, the frequency signal modulated by the frequency modulator 14, the luminance signal And the mixed signal is amplified through the recording amplifier 18, and applied to the image head CH ₁ (CH ₂ ) through the switch SW ₁ (SW ₂ ) as shown in FIG. Likewise helically recorded on a track on a videotape When reproducing the video signal recorded on the video tape it has been reproduced by using the image head (CH ₁₎ (CH ₂₎ a switch to a signal detected by the video tape (SW ₁₎ (SW ₂₎ based on the input playback.

Here, in the case where the video tape is driven in the standard mode, that is, the SP mode, a track having a predetermined width D ₁ is formed on the video tape as shown in FIG. 2, and the image head CH ₁ (CH ₂ ) is formed. If the same size as the width (D ₁₎ of the track, the video signal is written, but the whole of the width (D ₁₎ of the track being reproduced. Compared to standard mode Pear and Times for a long time that the running mode, that is, EP mode and LP mode, the actually video heads (CH ₁₎ (CH ₂₎ a track width (D ₁₎ than the smaller form by the video signal is the width of the tracks on the tape to (D ₁ )) A small width D ₂ is recorded and reproduced so that a predetermined width D ₃ is formed on the video tape where video signals are not recorded and reproduced.

However, such a conventional recording apparatus has a defect in that only one video signal can be selected and recorded, and two video signals cannot be simultaneously recorded on one video tape.

In view of such a conventional deficiency, the present invention provides an additional two video heads in the head drum to trace a portion of the video tape in which the video signal is not recorded and reproduced in the standard mode, and another video head on the video head. By applying a signal, two video signals are simultaneously recorded on a video tape, which will be described in detail with reference to FIGS. 3 to 6.

3 is a circuit diagram of a simultaneous recording apparatus according to the present invention. As shown therein, the first image signal VS ₁ is transmitted through the recording system 10 and the image head is provided through the recording / reproducing switches SW ₁₁ and SW ₁₂ . It is applied to (CH ₁₁ , CH ₁₂ ) and recorded on the video tape, and the signal detected by the image heads (CH ₁₁ , CH ₁₂ ) on the video tape is inputted to the playback system through the switch (SW ₁₁ , SW ₁₂ ) and reproduced. In the video recorder, the sync separators 31 and 32 for separating the sync signal from the first video signal VS ₁ and the second video signal VS ₂ , and the sync separators 31 and 32, respectively. according to the output signal and the write control signal (REC) and storing the second video signal (VS _2), said first video signal (VS ₁₎ and control signals (AD to output while maintaining a predetermined distance, DA, S _1, converting the second video signal (VS ₂₎ in accordance with S _2, M _1, and a gate array 33 for outputting the M _2), the control signal (AD) into a digital signal and An analog / digital converter 34 and the control signals (M _1, M _2), the analog / digital converter 34 the output signal stored by one field, and outputs the field memory 35, 36, which according to the , the switch (SW ₃₁₎ and said control signal (DA) to selectively input the output signal of the analog / digital converter 34 to the field memory 35, 36 in accordance with the control signal (S ₁₎ The digital / analog converter 37 converts the output signals of the field memories 35 and 36 into analog signals, and the output signals of the field memories 35 and 36 according to the control signal S ₂ . A switch SW ₃₂ for inputting the digital / analog converter 37 and an output signal of the digital / analog converter 37 to the image heads CH ₂₁ and CH through the recording / reproducing switches SW ₂₁ and SW ₂₂ . ₂₂ ) and a recorder 20 for recording on a video tape.

4A to C are explanatory views showing the image head installed by the simultaneous recording apparatus of the present invention, and as shown therein, the image heads CH ₁₁ and CH ₁₂ installed at an angle of 180 ° to the head drum 41. While maintaining the angle of 90 ° and the image head (CH ₂₁ , CH ₂₂ ) at a certain height (H) higher than the image head (CH ₁₁ , CH ₁₂ ), the image head (CH ₂₁ , CH ₂₂ ) the azimuth angle is the azimuth angle of the image head azimuth angle (+ θ _1, -θ ₁₎ and a different form that is, for example, the video heads (CH _21, CH ₂₂₎ a (CH _11, CH ₁₂₎ Form at 0 °.

The present invention configured as described above will be described in detail the effect.

When the first video signal VS ₁ is input, the first video signal VS ₁ passes through the recording system 10 as in the prior art, and the image head CH through the electronic switches SW ₁₁ and SW ₁₂ . ₁₁ , CH ₁₂ and recorded on tracks TA ₁₁ and TA ₁₂ of the video tape as shown in FIG.

When the first and second video signals VS ₁ and VS ₂ are input, the sync separators 31 and 32 separate the sync signals from the first and second video signals VS ₁ and VS ₂ . When input to the gate array unit 33 and the high potential write control signal REC is input to the gate array unit 33 as shown in FIG. 6A, the gate array unit 33 receives the control signal AD. The analog / digital converter 34 converts the second image signal VS ₂ into a digital signal and controls the second image signal VS ₂ output from the synchronous separator 32 according to the synchronization signal. The signals S ₂ (M ₁ and M ₂ ) are output and alternately stored in the field memories 35 and 36 for each field of the second image signal VS ₂ converted into a digital signal.

That is, when 32 is separated from the second image signal VS ₂ and the synchronization signal is input to the gate array unit 33 by separating the synchronization signal as shown in FIG. 6B, the gate array unit 33 is the first. When the synchronization signal is input, the movable terminal of the switch SW ₃₁ is shorted to one fixed terminal a ₃₁ so that the output signal of the analog-to-digital converter 34 is shown in FIG. 6C through the switch SW ₃₁ . As described above, when the second synchronization signal is input, the output signal of the analog / digital converter 34 is switched by shorting the movable terminal of the switch SW ₃₁ to the other fixed terminal b ₃₁ . As shown in FIG. 6D through the SW ₃₁ , the field memory 36 is stored in the field memory 36. As described above, the gate array unit 33 switches the switch SW ₃₁ as the synchronization signal of the second image signal VS ₂ is input. ), And the second image converted into a digital signal by controlling the field memories 35 and 36. The call (VS ₂₎ is stored by one field.

In this way, the second image signal VS _{2 for} one field stored in the field memories 35 and 36 is output according to the synchronization signal of the first image signal VS ₁ output from the synchronization separator 31, and the switch ( SW ₃₂ ) is input to the digital-to-analog converter 37 and converted into an analog signal.

That is, when the synchronous separator 31 separates the synchronous signal from the first image signal VS ₁ and inputs it to the gate array unit 33, as shown in FIG. 6E, the gate array unit 33 receives the field memory ( The storage of the second video signal VS ₂ for one field at 35 is completed, and the first video is stored when the second video signal VS ₂ of the next field is stored in the field memory 36 in the field memory 35. In the synchronization signal of the signal VS ₁ (Where T is the period of the synchronization signal) by delaying the short-circuit of the movable terminal of the switch SW ₃₂ to the fixed terminal a ₃₂ on one side, and as shown in FIG. 6F, the image stored in the field memory 35. A signal is output and converted into an analog signal through the switch SW ₃₂ , and converted into an analog signal by the digital / analog converter 37, and when a synchronization signal of the next first video signal VS ₁ is inputted, the synchronization signal By delaying, the movable terminal of the switch SW ₃₂ is short-circuited to the other fixed terminal b ₃₂ , and the image signal stored in the field memory 36 is output as shown in FIG. 6G to pass through the switch SW ₃₂ . Then, the digital-to-analog converter 37 changes the analog signal.

As shown in FIG. 6H, when the synchronization signal of the first video signal VS ₁ is inputted, the synchronization signal thereof. By delaying, the movable terminal of the switch SW ₃₂ is short-circuited to the fixed terminal a ₃₂ on one side, and the digital / analog converter 37 outputs a video signal stored in the field memory 35 as shown in FIG. It converts into an analog signal and when the next sync signal is input, By delaying, the movable terminal of the switch SW ₃₂ is short-circuited to the other fixed terminal b ₃₂ , and the video signal stored in the field memory 35 is output and converted into an analog signal by the digital / analog converter 37.

That is, the second video signal (VS ₂₎ a second video signal (VS ₂₎ stored in the field memory 35, 36 in accordance with the synchronizing signal from the synchronizing signal of the first video signal (VS ₁₎ of After delaying, it is output as first-in first-out (FIFO) and converted into an analog signal by the digital / analog converter 37, which is converted into an analog signal by the analog converter 37, and then converted into the analog signal. One second video signal VS ₂ is applied to the video heads CH ₂₁ and CH ₂₂ via a recorder 20 and through switches SW ₂₁ and SW ₂₂ to be shown in FIG. Are recorded on tracks TA ₂₁ and TA ₂₂ .

Here, in the synchronization signal of the first video signal VS ₁ The reason for delaying and outputting the second image signal VS ₂ stored in the field memories 35 and 36 is that the image heads CH ₂₁ and CH ₂₂ are at an angle of 90 ° with the image heads CH ₁₁ and CH ₁₂ . From the time when the image heads CH ₁₁ and CH ₁₂ trace the tracks TA ₁₁ and TA ₁₂ of the video tape while being installed on the head drum 41 After a lapse of the video heads (CH _21, CH ₂₂₎ that is due to trace the track (TA _21, TA ₂₂₎ of the tape, wherein the video heads (CH _21, CH ₂₂₎ are more video heads (CH _11, CH ₁₂₎ Since a certain height (H) is provided, a gap of a constant width (D ₄ ) in which a video signal is not recorded is formed between the tracks TA ₁₁ , TA ₂₁ , TA ₁₂ , and TA ₂₂ of the video tape. This has no effect on recording and playing back video signals on tracks TA ₁₁ , TA ₂₁ , TA ₁₂ , TA ₂₂ .

In this way, when the video tapes on which the first and second video signals VS ₁ and VS ₂ are recorded are reproduced, the video heads CH ₁₁ and CH ₁₂ (CH ₂₁ and CH ₂₂ ) are connected to the tracks TA ₁₁ , CH ₁₁ . TA ₁₂ ) (TA ₂₁ , TA ₂₂ ) are traced to detect the first and second video signals VS ₁ and VS ₂ , respectively, and the detected signals are switched SW ₁₁ , SW ₁₂ , SW ₂₁ ,. SW ₂₂ is input to the playback system and played back.

As described in detail above, the present invention records two video signals simultaneously, so that both video signals simultaneously input can be recorded by one video recorder.

Claims (2)

The first video signal VS ₁ is applied to the video heads CH ₁₁ and CH ₁₂ through the recorder 10 and through the record / playback switches SW ₁₁ and SW ₁₂ to be recorded on the video tape, and then to the video tape. In the video recording player for detecting the signal detected by the video head (CH ₁₁ , CH ₁₂ ) in the playback system through the switch (SW ₁₁ , SW ₁₂ ), the first video signal VS ₁ and the second a sync separator (31, 32) for separating a synchronizing signal from the video signal (VS _2), the second image signal in response to the output signal and the write control signal (REC) of said sync separator (31) (32) (VS ₂ ) And outputs control signals AD, DA, S ₁ , S ₂ , M ₁ , and M ₂ so as to be output while maintaining a predetermined distance from the first image signal VS ₁ . and the analog / digital converter 34 for converting a second video signal (VS ₂₎ into a digital signal according to the control signal (AD), wherein O in accordance with the control signals (M _1, M ₂₎ Storing the output signals of the log / digital converter 34 by one field, and wherein the output signal of the analog / digital (34) according to the output field memory 35 (36), said control signal (S ₁₎ A switch SW ₃₁ for selectively inputting into the field memories 35 and 36 and a digital / analog converter for converting the output signals of the field memories 35 and 36 into analog signals in accordance with the control circuit DA. (37), a switch (SW ₃₂ ) for inputting the output signals of the field memories (35) and (36) to the digital analog converter (37) in accordance with the control circuit (S ₂ ), and the digital / analog converter ( 37) a recorder (20) configured to apply the output signal from 37) to the video heads (CH ₂₁ , CH ₂₂ ) via the record / playback switches (SW ₂₁ , SW ₂₂ ) to record on a video tape. Simultaneous recording of two video signals. The image heads CH ₁₁ and CH ₁₂ of claim 1, wherein the image heads CH ₂₁ and CH ₂₂ are maintained at an angle of 90 ° to the head drum 41 with the image heads CH ₁₁ and CH ₁₂ . than it installed in a predetermined height (H) higher position, and video heads (CH _21, CH ₂₂₎ azimuth angle video heads (CH _11, CH ₁₂₎ azimuth angle (+ θ ₁₎ of the (- θ ₁₎ and Simultaneous configuration of two video signal recording apparatus of the video recording and reproducing apparatus.