JPS58175389A - Video signal recorder unified with camera - Google Patents

Abstract

PURPOSE:To eliminate an amplitude enlarging circuit for color reference signal which is provided at the VTR side, by enlarging the amplitude of the color reference signal larger than the prescribed value of a standard color TV signal when the reference color signal is inserted to a video signal. CONSTITUTION:The video signal obtained from an image pickup element 10 is supplied to a Y signal processing circuit 11 and C signal processing circuit 12. The circuit 12 synthesizes the color difference signals, and therefore the color subcarrier is modulated and fed to a color reference signal inserting circuit 14. The color reference signal supplied from a signal line 15 undergoes a level control through a level controller 16 so that its amplitude is doubled compared with the amplitude of the color reference signal of a standard color TV signal. Such a color reference signal is fed to the circuit 14. Then the enlarged color reference signal is inserted to the color signal supplied from the circuit 12 and then sent to a Y-C mixing circuit 13. The color reference signal enlarged at a reproducing system is converted into a standard color TV signal through a color reference compressing circuit 28.

Description

[Detailed Description of the Invention] [Technical Field to which the Invention Pertains] The present invention relates to a camera-integrated video signal recording device that combines a video camera, which is a photographic device, and a video signal recording device represented by a video tape recorder (VTR) K. Regarding the device [Technical background of the invention and its problems a] One of the recording methods adopted in video signal recording devices such as VTRs is the chroma signal low frequency conversion method.

This is a method in which the subcarrier frequency of the color signal constituting the video signal is converted to a lower frequency to control the color signal. When this method is adopted, in order to maintain a good 8/N ratio of the color signal, the amplitude of the color reference signal is recorded at twice the specified value for standard color television signals, such as NT80. When played back, the signal is compressed to become a standard color television signal, or when a video camera and VTR are connected with a cable to capture and record a subject image, the color reference signal shown in F is compressed. Amplitude expansion is performed, and in this case, INK first converts the video signal obtained by scanning it with a video camera.

VTRK must be provided as a standard color television signal. The video signal obtained by rounding and table-coating is
A color reference signal is inserted at the camera stage and provided to the VTR as a standard color television signal.

Recently, a camera-integrated video signal recording device that combines a video camera and a VTR has been attracting attention. If the chroma signal low-frequency conversion method is adopted for this camera-integrated video signal recording device, the conventional method can be used as is. When the meeting is over, a color reference signal is inserted at the camera stage, and this color reference signal is further enlarged at the VTR stage. When a color reference signal is processed using such a configuration, the color reference signal is likely to deteriorate due to the large number of processing times, and this also results in an increase in circuit scale. For this reason, the reduction in size, weight, and power consumption of the camera-integrated signal recording device, which are originally desired, cannot be achieved sufficiently.

[Object of the Invention] In view of the above problems, it is an object of the present invention to provide a camera-integrated Eirin Signal 1-Sickle device with a reduced circuit scale.

[Summary of the Invention] The camera-integrated video signal control device of the present invention omits the color reference signal amplitude expansion circuit that is required on the VTR side when the chroma signal low-frequency conversion method is adopted. can be,
Instead of inserting a color reference signal, which was done at the camera stage to obtain a standard color television signal, nine color reference signals with expanded amplitude levels are inserted.

[Effects of the Invention] According to the present invention, it is possible to omit the conventionally required color reference signal amplitude expansion circuit, thereby reducing the circuit scale of the device. As a result, the device can be made smaller, lighter, and have lower power consumption.In addition, as the circuit scale is reduced, the number of times the color reference signal is processed is reduced, and signal deterioration can be prevented. Furthermore, in the present invention, since a color reference signal with a large amplitude is already used when inserting the color reference signal, the S/N of the color reference signal is improved.
[Embodiment of the Invention] Hereinafter, an embodiment of the camera-integrated video signal apparatus of the present invention will be described in detail with reference to the drawings.

The image signal obtained from the image sensor 10 is sent to the Y signal processing circuit 1.
1 and C signal processing circuit 12. Y signal processing circuit 1
], the Y signal is synthesized, and further r@positive, white clip,
Island clipping, synchronization signal insertion, etc. are performed, and the signal is sent to the Y-C mixing circuit 13.

On the other hand, the C signal processing circuit 12 synthesizes the color difference signals, and as a result, the color subcarrier (3,58MH2) is converted into Rv4 and sent to the color reference signal insertion circuit 14. The color reference signal input from the signal line 15 is level-adjusted in a level adjustment 616 so that the amplitude is twice that of the color reference signal of a standard color television signal, and then sent to the color reference signal insertion circuit 14. . In the color reference signal compression circuit 14, the C signal processing circuit 12
The expanded color reference signal from the level adjuster 16 is inserted into the color signal from the YC mixing circuit 13. Y-
The C mixing circuit 13 mixes the Y signal from the Y signal processing circuit 11 and the C signal from the color reference signal insertion circuit 14 and outputs it as a color television signal in which the one-color basic signal is expanded. Y
-C separation circuit 17 converts the signal from y-C mixing circuit 13 into
Separate into signal and C signal. The Y processing circuit 18 applies a bias, [lambda] center lip, and a black clip to the Y signal from the Y-0 circuit 17, and further converts it into a KFM signal. C
The @an circuit 19 converts the C signal from the y-c circuit 17 into a low width carrier wave signal (688 KHz) Km.

Y-(゛ Mixing circuit mixes the signal outputs of the Y signal processing circuit 1618 and the C signal processing circuit 11819. The distribution amplifier circuit 21 amplifies the signal from the Y-○ mixing circuit and switches n
The magnetic head 23 records the information on one sickle medium through the magnetic head 23.

Next, the playback system will be explained. The playback output from the magnetic head is amplified and equalized by the preamplifier circuit through the switch η, and the preamplifier output is y−c [o+approximately 3
The signal is separated into y and c and guided to a Y signal processing circuit and a C signal processing circuit. The C signal processing circuit I converts the color signal on the 688KH2 subcarrier into a 3.58M)1z subcarrier signal and sends it to the color reference signal compression circuit.
The color reference signal compression circuit compresses the amplitude of the color and S semi-signals that have been expanded by the public to a standard color television signal.
-Cl 1% combination 11Send to 129. On the other hand, Y signal processing 1
In the circuit grave, the signal from Y-C separation circuit 3 is received, and F
The signal is subjected to M tone and de-emphasis and sent to Y-C mixing circuit 4.

The Y-C mixing circuit 4 combines the Y and C signals from the Y signal processing circuit and the color reference signal compression circuit to form a standard NT8C
Output from the signal line (capital) as a color television signal. The playback system described above is not built into the device, but can be prepared as an external adapter.Although the example in which NTSC television signals are recorded and played back is described, it can also be applied to other color television signal systems. heavy color 4ifs
The signal expansion ratio does not necessarily have to be twice, and may be any value that can ensure 87'N of the reproduced image.

In FIG. 1, a YC mixing circuit 13, a Y-C separation circuit 19
is omitted, and the output of the Y signal processing circuit 1] is directly connected to the input of the Y signal processing circuit 18, and the output of the color reference signal insertion circuit #s14 is directly connected to the input of the C signal processing circuit 190. Although the video signal recording and reproducing apparatus is a one-head type, the present invention can also be applied to other types such as two-head and four-head helical type.

[Brief explanation of the drawing]

FIG. 1 is a circuit block diagram showing an embodiment of a camera-integrated video recording device according to the present invention. 10... Table element, 11.18... Y signal processing circuit. 12, 19-C signal processing circuit, 14... color reference signal insertion circuit.

Claims (1)

[Claims] In a camera-integrated video signal recording device that combines a video camera and an Eirin signal 4Il value, when inserting a color reference signal into the video signal obtained by photographing a subject, color JI&
A camera-integrated video signal recording device characterized in that the amplitude of a quasi-signal is expanded to a standard color television signal and inserted.