JPS62237887A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To easily confirm the recording state of a color difference signal by supplying switchingly a reproduced luminance signal and a recovered color difference subjected to synchronizing shaping to a black/white picture monitor switchingly. CONSTITUTION:A synchronizing shaping circuit 46 extends the pulse width of a recovered multiplex color difference signal formed by a multiplex chrominance signal reproducing system 40 and uses the pulse VD of the proper timing from a drum system control circuit 4 to form a pseudo verical drive signal. The multiplex color difference signal subjected to synchronizing shaping is fed to the black/white picture monitor 3 via switches 7,2 in place of the recovered luminance signal from a luminance signal reproducing system 30. Thus, the black/white reproduced picture by the multiplex color difference signal is displayed on the screen of the monitor 3. Thus, the recording state of the multiplex color difference signal is easily confirmed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnetic recording and reproducing device that records and reproduces luminance signals and color difference signals on different tracks.

[Summary of the invention]

The present invention provides a magnetic recording and reproducing apparatus that records and reproduces luminance signals and color difference signals on different tracks of a magnetic tape, by switching and supplying reproduced luminance signals and synchronously shaped reproduced color difference signals to a monochrome image monitor. , the recording status of each luminance signal and color difference signal can be confirmed.

[Conventional technology]

2. Description of the Related Art Conventionally, a so-called camera-integrated VTR, in which a TV camera and a VTR are combined into a portable type, has been used for news reporting and the like.

Conventional camera-integrated VTRs are generally not equipped with a function to monitor playback images in order to reduce their size and weight, and magnetic tapes recorded at news gathering sites are transported to broadcast vans or broadcast vehicles for program editing. It was played on broadcast stations, etc.

However, in order to ensure reliable coverage, it is desirable to be able to immediately check the recording status at the location of the interview. For this reason, we installed a black and white viewfinder and image monitor.
There was also a camera-integrated VTR that allowed the recording state of only the luminance signal to be checked.

Such a conventional VTR is constructed, for example, as shown in FIG. That is, in FIG. 1, a luminance signal Y with a bandwidth of, for example, 4 MIIz from the power camera (1) is transmitted to the recording side fixed contact (2r) and the movable contact (2c) of the switch (2).
The FM luminance signal YFM from the 0 frequency modulator (12) is supplied to the monochrome viewfinder (3) and also to the frequency modulator (12) of the luminance signal recording system (10). (13) and switch (14), the recording heads (15^) and (15s) arranged at an angular interval of 180° on a rotating head drum (not shown) are transferred.
are supplied alternately. A head switching signal is supplied to the switch (14) from the drum system control circuit (4) to control evening and f-timing of head switching.

On the other hand, from camera (1), for example, 2MIIz each
The color difference signals R-Y and B-Y with a bandwidth of
The signals are supplied to the time division multiplexing circuit (21) of 20), are compressed in time axis to 1/2, and are time division multiplexed for each line. Assuming that the subject of the camera (1) is a color bar pattern, the luminance signal Y has a waveform as shown in FIG. 5A, and the output signal of the time division multiplexing circuit (21), that is, the time division multiplexed color difference signal MX, The waveform becomes as shown in FIG.

Note that the luminance signal Y includes a vertical synchronization signal, but the multiple color difference signal does not include a vertical synchronization signal, and the pulse width of the horizontal synchronization signal is narrowed to, for example, about 2 pa for time axis compression.

Such a time-division multiplexed color difference signal MX is transmitted to a frequency modulator (2
2) Frequency modulation! The FM multiplexed color difference signal MXFM from (22) passes through a recording amplifier (23) and a switch (24) to a recording head (15^) for luminance signals.
and (15s) are alternately supplied to the recording heads (25^) and (25e), which are arranged at predetermined delay angle intervals, respectively. The switch (24) has a drum system control circuit (
4) to a delay line (5) with a delay time TQ corresponding to the delay angle.
) to control the timing of head switching.

A recording head (15^) configured as described above.

(15e), (25^) and (25B), the FM luminance signal YFM and the FM multiplexed color difference signal MXFM are respectively recorded on different tracks on the magnetic tape (not shown).

During playback, both playback heads (3o) of the luminance signal playback system (3o)
1^) and (31s), only the brightness signal track of the magnetic tape is scanned, and the FM brightness signal YF1+1 is reproduced. The playback heads (31^) and (31g) may also serve as the recording heads (15^) and (15g), respectively, and the way the playback is output depends on the amplifier (32^) and (31g), respectively.
32g) to each fixed contact (33) of the switch (33).
a) and (33b).

A head switching signal is supplied from the drum system control circuit (4) to the switch (33), and the movable contacts (33c ) is the re-fixed contact (3
3a) and (33b) alternately.

Thereby, the reproduced FM luminance signal YFM is supplied to the frequency demodulator (34), and the luminance signal Y is reproduced.

The output of the demodulator (34) is commonly supplied to the synchronous separation circuit (35) and the synchronous shaping circuit (36), and the output of the synchronous separation circuit (35) is supplied to the synchronous shaping circuit (36) to perform synchronization. The shaped reproduction brightness signal passes through the reproduction side fixed contact (2p) and movable contact (2c) of the switch (2),
The image is supplied to a monochrome viewfinder (3) and an image based on the reproduced luminance signal is monitored.

[Problem that the invention seeks to solve]

However, the conventional camera-integrated V
Since the TR does not have a color signal monitoring function, there is a problem in that it is not possible to check the recording state of the color signals.

In addition, in order to monitor color signals, it is necessary to provide a color display and also a device for separating multi-m color difference signals, which complicates the circuit configuration and
Dimensions, power consumption, weight, etc. increase, and portability is impaired.
The problem arises that it interferes with the interview.

In view of the above, an object of the present invention is to provide a magnetic recording/reproducing device that has a simple configuration and allows the recording state of color difference signals to be easily confirmed.

[100th Way to Solve the Problem] The present invention provides a method for synchronizing the reproduced color difference signals in a magnetic recording/reproducing device that records and reproduces luminance signals and color difference signals on different tracks of a magnetic recording medium. A synchronous shaping means for shaping the signal and a reproduction signal switching means for selectively sending out the reproduced luminance signal and the color difference signal are provided, and the reproduced luminance signal and the color difference signal synchronously shaped by the synchronous shaping means are provided. This is a magnetic recording and reproducing apparatus that switches the signals and supplies them to a black and white image monitor to check the respective recording states of the luminance signal and the color difference signal (ilf).

[Effect]

According to this configuration, the recording state of the color difference signal can be easily monitored immediately after recording in the same way as the luminance signal.

〔Example〕

Hereinafter, one embodiment of a magnetic recording/reproducing apparatus according to the present invention will be described with reference to FIGS. 1 to 3.

FIG. 1 shows the configuration of an embodiment of the present invention. In FIG. 1, parts corresponding to those in FIG. 4 are designated by the same reference numerals and redundant explanation will be omitted.

In FIG. 1, reference numeral (40) indicates a multiple color signal reproduction system as a whole, which is constructed in the same manner as the luminance signal reproduction system (30) described above.

That is, the reproducing head (41^) of the multiple color signal reproducing system (40)
) and (41B) are recording heads (25^) and (25s
) may also be used, and the reproduced output passes through the amplifiers (42^) and (42s), respectively, and is then sent to the switch (42).
3) are supplied to each of the fixed contacts (43a) and (43b). A head switching signal is supplied to the switch (43) from the drum system control circuit (4) via the delay line (5).

The output of the switch (43) is supplied to the frequency demodulator (44), the output of the demodulator (44) is commonly supplied to the synchronous separation circuit (45) and the synchronous shaping circuit (46), and the synchronous separation circuit (45) The output of the synchronous shaping circuit (46) is supplied to the synchronous shaping circuit (46), and the pulse VD having the same timing as the vertical drive signal is supplied from the drum system control circuit (4) to the synchronous shaping circuit (46). This pulse VD may be a reference vertical drive J signal of a servo system, and may also be a reference vertical drive J signal of a servo system, or a luminance signal reproducing system (30).
It may be obtained from the synchronous separation circuit (35) of

The output of the synchronous shaping circuit (46) is supplied to the multiple color signal side fixed contact (7m) of the switch (7), and the luminance signal side fixed contact (7y) is supplied with the synchronous shaping circuit of the luminance signal reproduction system (30). (36) is supplied. switch (7)
The movable contact (7c) is connected to the reproduction side fixed contact (2p) of the switch (2). The rest of the structure is the same as the conventional example shown in FIG. 4 mentioned above.

Next, with reference to FIGS. 2 and 3, the operation during reproduction of this embodiment will be described.

As mentioned above, the luminance signal reproducing head (31^) and (
31a) is a multi-color signal reproducing head (41^) and (
41g), so the reproduction RF signals of the reproduction head (31^) and (31g) and
are outputted alternately at one field period, as shown in FIG. 2A and B, respectively, and the reproducing head (41A) and (41o) each playback RF output ■ and ◎
are output alternately in one field period.

A head switching signal supplied from the drum system control circuit ((1) to both switches (33) and (43) causes each playback head (31^) and (31s) and (41Δ) and (41B) to switch to the recording track, respectively. The movable contacts (33c) and (43c)
) are each fixed contact (33a) and (33b) and (
43a) and (43b) alternately. As a result, the reproduced FM luminance signal YFM and FM multiplexed color difference signal M
), and the luminance signal Y and multiple color difference signal MX are reproduced.

As shown in FIG. 2 E and F, the output of the repeater (34) [
F] contains the vertical synchronization signal V 5sync, but the output [F] of the demodulator (44) does not contain a vertical synchronization signal, so the output [F] of the demodulator (44) is viewed as is. Even if it is supplied to the finder (3), vertical synchronization is not applied.

Therefore, in this embodiment, the synchronization shaping circuit (46) widens the pulse width of the horizontal synchronization signal of the reproduced multiplex color difference signal [F] to about 5 times, and also increases the pulse width of the horizontal synchronization signal supplied from the drum system control circuit (4), etc. Pulse V at appropriate timing
D forms a pseudo vertical drive signal. The multiple color difference signals synchronously shaped in this way are sent to switches (7) and (2).
), the viewfinder (3) synchronizes, and a black and white reproduced image based on the multiple color difference signal appears on its screen, which allows you to check the recording state of the multiple color difference signal. It can be confirmed.

If the subject is a red apple and the background is blue, and the switch (7) is in the opposite connection state than shown, the viewfinder (3) screen will display a normal black and white image as shown in Figure 5A. An image appears. When the switch (7) is in the connected state shown in the figure, the multiple color difference signal is compressed in the time axis, so the screen of the viewfinder (3) is compressed horizontally and displayed vertically as shown in Figure B. An image of the RY component and an image of the B-Y component are displayed side by side.

As shown in FIG. 5 above, the multiple color difference signals RY and B
-Y has different DC levels for the same color; in the above case, the subject apple is white and the background is gray on the left screen corresponding to the R-Y signal, while the right screen corresponding to the B-Y signal Now, conversely, the subject apple will be gray and the background will be white.

In the above embodiment, multiple color difference signals are time-division multiplexed in one horizontal scanning period, but even when each color difference signal is recorded line-sequentially, appropriate changes such as providing a means for selecting a horizontal scanning line can be made. Therefore, the present invention can be applied.

〔Effect of the invention〕

As described in detail above, according to the present invention, the reproduced color difference signal is synchronously shaped, switched to a luminance signal, and supplied to a monochrome image monitor, so that the recording state of the color difference signal can be easily checked. A magnetic recording/reproducing device capable of this is obtained.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment of a magnetic recording/reproducing apparatus according to the present invention, FIG. 2 is a timing chart for explaining the operation of the embodiment of FIG. 1, and FIG. FIG. 4 is a block diagram showing a configuration example of a conventional magnetic recording/reproducing apparatus, and FIG. 5 is a waveform diagram showing a video signal of a conventional example. (3) is a black and white image monitor, (4) is a drum system control circuit,
(7) is a switch, (21) is a time division multiplex circuit, (3o
) is a luminance signal reproduction system, (4o) is a multiple color signal reproduction system, (
46) is a synchronous shaping circuit.

Claims (1)

[Claims] A magnetic recording and reproducing device that records and reproduces a luminance signal and a color difference signal on different tracks of a magnetic recording medium, comprising: synchronous shaping means for shaping a synchronization signal of the reproduced color difference signal; reproduction signal switching means for selectively transmitting the luminance signal and the color difference signal, and switching between the reproduced luminance signal and the color difference signal synchronously shaped by the synchronous shaping means to display a monochrome image monitor; A magnetic recording and reproducing apparatus characterized in that the recording state of each of the luminance signal and the color difference signal is confirmed by supplying the luminance signal and the color difference signal.