JP3694784B2 - Color video signal transmission system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a color video signal transmission system in which a color camera provided in a lobby intercom or the like of a condominium and a color monitor television provided in an interphone or the like of each dwelling unit are connected.
[0002]
[Prior art]
Conventionally, color image signal transmission systems have been introduced in apartment houses such as apartments, and color images on the common entrance side can be seen in each dwelling unit. When called from the lobby intercom at the common entrance, the housing information panel of each dwelling unit displays the video of the visitor on the monitor TV. If you check the video and answer the call, you can make an intercom call while watching the video. In addition, if a predetermined operation is performed, the electric lock at the common entrance can be unlocked and a visitor can be invited into the apartment house.
[0003]
Such a color video signal transmission system in an apartment house is configured by combining a video control panel, a distributor, an amplifier, and the like with a built-in four distributor, but these devices can cope with signal attenuation. Therefore, an amplifier for gain adjustment is built in.
[0004]
[Problems to be solved by the invention]
In this way, in the conventional color video signal transmission system, the amplifiers for gain adjustment are built in the component devices. Therefore, when each device is stacked and connected in multiple stages, the color phase of the video signal is determined by the frequency characteristics unique to the amplifier. In some cases, a delay (displacement) occurs and color shift occurs in comparison with the primary color. For example, on a monitor TV at a dwelling unit, the primary lemon color changes to a brightly-brown color, and the face color of the person changes and appears. Conventionally, such color misregistration has been dealt with by manually adjusting the hue on the television side.
[0005]
The present invention has been made in view of such circumstances, and provides a color video signal transmission system capable of correcting color misregistration without requiring a troublesome adjustment operation on the monitor television side. It is an object.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a color image in which a multi-stage amplifier is interposed in a video signal path connecting a color camera installed in a common entrance and a color monitor television installed in each dwelling unit. Applies to signal transmission systems.
[0007]
In the first aspect, the color monitor television of each dwelling unit is configured to include a color phase correction switch that corrects the phase delay of the color signal in the on state, and the video signal path of the color monitor television of each dwelling unit is provided in the video signal path. In a color monitor television in which the intervening amplifier has a predetermined number of stages or more, the color phase correction switch is turned on.
[0009]
According to a second aspect of the present invention , the color video signal transmission system includes an adapter unit that corrects a phase delay of the color signal, and the adapter unit is provided at a position where the amplifier of the video signal path is equal to or more than a predetermined number of stages. Intervene.
[0010]
In claim 3 , the color monitor television of each dwelling unit includes a configuration for correcting the phase delay of the color signal, and at a position where the amplifier interposed in the video signal path is equal to or more than a predetermined number of stages, A configuration for correcting the phase delay of the color signal is provided.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a system configuration diagram showing an example of the configuration of a wired color video signal transmission system. In an apartment house, a multistage amplifier is interposed in a video signal path connecting a lobby intercom 1 with a color camera installed at a common entrance and a color monitor television 6 installed at each dwelling unit.
[0012]
Here, an amplifier (Amp) having 1 to 7 stages is interposed in the video signal path, and in addition to the amplifier 2, an amplifier built in the video control panel 3 and the 2 distributor 5 is interposed. In the figure, 5 is a branching device.
[0013]
The present invention proposes three configurations for correcting the phase delay of the color signal. In the first configuration, the color monitor television 6 of each dwelling unit is provided with a color phase correction switch (color phase correction switch SW shown in FIG. 3). In this case, among the color monitor televisions 6 of each dwelling unit, the color monitor television 6 in which the amplifier interposed in the video signal path has a predetermined number of stages (for example, 5 stages) or more turns on the color phase correction switch SW and turns on the color Correct the phase delay of the signal. In FIG. 1, the predetermined number of stages is five, and the color phase correction switch SW is turned on in the three color monitor televisions 6 (# 1, # 2, and # 3) connected thereafter. ing.
[0014]
With such a configuration, when the system is introduced, the color phase correction switch SW of the target color monitor TV 6 is simply turned on, so that the color of the color can be obtained even if the inhabitants do not perform troublesome color adjustment operations. The deviation can be corrected.
[0015]
FIG. 2 shows a conceptual waveform diagram for explaining the correction of the phase delay of the color signal. FIG. 2A shows the original signal, and the color phase delay times Δt1 to Δt7 become longer and the degree of color misregistration increases as the number of amplifier stages passing through increases. Therefore, here, the color phase correction is performed on the assumption that the difference visually perceived by humans becomes noticeable when passing through five or more amplifiers. Specifically, as shown in FIGS. 5F to 5H, the color phase delay time is advanced by Δt5.
[0016]
Next, the configuration of a system serving as a reference example of the present invention will be described. Reference phase data of color signals is stored in advance in the color monitor television 6 of each dwelling unit (stored in the reference data memory 10a shown in FIG. 3). . Each color monitor TV 6 compares the reference color signal transmitted from the color camera 1 with the reference phase data, and corrects the phase delay of the color signal.
[0017]
In the color monitor TV 6, when the reference color signal (R, G, B) built in the lobby intercom 1 is transmitted, the transmitted reference color signal and the stored color signal (just before the video is displayed). R, G, and B) reference phase data are compared to detect a phase shift.
[0018]
With such a configuration, only the reference phase data is stored in the manufacturing stage of the color monitor TV 6, and the phase is automatically set in each color monitor TV 6 without any operation at the time of system introduction. It is possible to correct the delay and project an image without color misregistration. Further, it is not necessary to recognize the system configuration in advance.
[0019]
Next, a third configuration of the system of the present invention will be described. An adapter unit 7 for correcting the phase delay of the color signal is interposed at a position where the amplifier of the video signal path is equal to or more than a predetermined number of stages. In FIG. 1, an adapter unit 7 for color phase correction is interposed at a position where the number of amplifier stages is five.
[0020]
With such a configuration, the color correction of a plurality of color monitor televisions 6 can be performed by simply inserting one adapter unit 7. Further, the color monitor television 6 does not need to include the color phase correction switch SW or store the reference phase data, and may have a conventional configuration. Therefore, each color monitor TV 6 can display an image without color misregistration without any operation.
[0021]
Next, the fourth configuration of the system of the present invention will be described. Among the color monitor televisions 6 of each dwelling unit, the color monitor television 6 in which the amplifier interposed in the video signal path has a predetermined number of stages or more is used. The color monitor TV 6 is corrected. That is, the monitor television 6 with the corrected color phase is installed in a place where color misregistration occurs. With this configuration, on-site adjustment work or the like is not required during system construction.
[0022]
Next, the internal configuration of the color monitor TV 6 installed in the dwelling unit is shown in a block diagram in FIG. The color monitor television 6 includes a CPU 10 (microcomputer), a color signal processing circuit 11, a television activation circuit 12, a relay 13, an unbalance conversion circuit 14, a bandpass filter circuit 15, a video signal demodulation circuit 16, It is composed of a constant voltage DC power supply circuit 17 and a diode bridge circuit 18 and the like.
[0023]
The color signal processing circuit 11 includes a video chroma signal processing circuit 11a, an RGB driver circuit 11b, a color LCD panel 11c, a bus I / F circuit 11d, a synchronization circuit 11e, and a timing controller circuit 11f.
[0024]
When there is a call from the lobby intercom 1 side and a television activation signal is received, the relay 13 is switched and a video signal is input. After being demodulated, the video signal is output as a color signal (R, G, B) by the video chroma signal processing circuit 11a, and displayed as a color video on the color LCD panel 11c via the RGB driver circuit 11b.
[0025]
In the present invention, the color monitor television 6 is provided with a color phase correction switch SW (work order switch), and this switch SW is turned on in the monitor television 6 in which the amplifier has a predetermined number of stages or more. Then, a serial control signal is output from the CPU 10, and color phase correction data is output to the video chroma signal processing circuit 11a via the bus I / F circuit 11d. The video chroma signal processing circuit 11a outputs RGB data whose color phase has been corrected to the color LCD panel 11c via the RGB driver circuit 11a. Then, a color image close to the primary color is displayed on the color LCD panel 11c.
[0026]
In the present invention, the color phase correction can be automatically performed in all color monitor televisions 6 by applying the DSP technology. In that case, the reference phase data is stored in the reference data memory 10a constituted by an EEPROM or the like in the CPU 10.
[0027]
Next, FIG. 4 shows an example of the appearance of the color monitor television 6. Here, a color phase correction switch SW is provided on a built-in printed wiring board P (indicated by a broken line in the figure). In the color monitor television 6 in which the amplifier passes 5 stages or more, the color phase correction switch SW is set to the “present” side. Then, the phase delay of the color signal is corrected.
[0028]
In the above, the monitor TV in the apartment house has been described, but the present invention may be applied to a home TV. That is, in a CATV (cable television) for general households, the farther away from a cable television station, the greater the number of amplifiers inserted and the color shift. Therefore, if a home-use television is provided with a color phase correction switch (SW), a television located at a long distance performs a one-touch operation on the color phase correction switch when watching cable television. That way, you can watch video without color shifts on home TV.
[0029]
【The invention's effect】
As can be understood from the above description, in the color video signal transmission system according to claim 1 of the present invention, the color monitor television in which the amplifier interposed in the video signal path has a predetermined number of stages or more is provided with a color phase correction switch. In the on state, the phase delay of the color signal is corrected. As a result, it is possible to correct color misregistration even if the inhabitants do not perform troublesome color adjustment operations by simply setting the target color monitor TV to correct the color phase when introducing the system. .
[0031]
According to the second aspect of the present invention , the adapter unit for correcting the phase delay of the color signal is interposed at the position where the amplifier of the video signal path is equal to or more than the predetermined number of stages. There is no need to store data, and the conventional configuration may be used. In addition, each color monitor television can display an image without color misregistration without any operation.
[0032]
According to the third aspect of the present invention , since the color monitor television in which the amplifier interposed in the video signal path has a predetermined number of stages or more is corrected, the phase delay of the color signal is corrected. It becomes unnecessary.
[Brief description of the drawings]
FIG. 1 is a system configuration diagram showing an example of a color video signal transmission system of the present invention.
FIG. 2 is a diagram for explaining correction of a phase delay of a color signal.
FIG. 3 is a block diagram illustrating an example of an internal configuration of a color monitor television.
FIG. 4 is a diagram illustrating an example of the appearance of a color monitor television.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Lobby intercom with color camera 2 Amplifier 3 Video control board 4 2 Distributor 5 Branching device 6 Color monitor television 7 Adapter unit SW Color phase correction switch 10 CPU
10a Reference data memory

Claims (3)

In a color video signal transmission system in which a multi-stage amplifier is interposed in a video signal path connecting a color camera installed at a common entrance and a color monitor TV installed in each dwelling unit,
The color monitor television in each dwelling unit is in the on state is configured to include a color phase correction switch for correcting the phase delay of the color signals,
Of color monitor television each dwelling unit, a color video signal transmission system amplifier interposed video signal path that the color TV monitor becomes more than a predetermined number, the color phase correction switch in the ON state. In a color video signal transmission system in which a multi-stage amplifier is interposed in a video signal path connecting a color camera installed at a common entrance and a color monitor TV installed in each dwelling unit,
The color video signal transmission system includes an adapter unit that corrects the phase delay of the color signal,
A color video signal transmission system in which the adapter unit is interposed at a position where the amplifier of the video signal path has a predetermined number of stages or more. In a color video signal transmission system in which a multi-stage amplifier is interposed in a video signal path connecting a color camera installed at a common entrance and a color monitor TV installed in each dwelling unit,
Above the color monitor television of each dwelling unit, which include the construction for correcting the phase delay of the color signals,
A color video signal transmission system in which an amplifier interposed in a video signal path has a configuration for correcting the phase delay of the color signal at a position where a predetermined number of stages or more are provided.

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