JP2583928B2 - Setting error detection device for input signal selection - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an input signal selection error detecting device for preventing a malfunction or an erroneous operation due to an input signal selection error in a device handling various video signals such as a VTR.

2. Description of the Related Art Currently, there are signal sources and video cameras that generate various video signals, and these can be roughly divided into the following three types of video signals.

(1) Composite video signal (hereinafter referred to as composite signal) (2) Luminance signal and carrier chrominance signal (hereinafter referred to as YC signal) (3) Luminance signal and a plurality of color difference signals, for example, RY signal and BY signal (hereinafter There are also several types of camera cables for transmitting video camera signals, and different signals may be transmitted on the same cable line depending on the camera used. On the other hand, the device that handles those signals is also provided with an input signal switching unit to cope with this, and is configured to be able to switch and handle some input signals.

FIG. 2 shows a flow example of input signals and a connection example of an input signal switching unit of a device provided with an independent input terminal of a composite signal and a pin camera cable input terminal.

In FIG. 2, the solid line represents the flow of the composite signal, the broken line represents the flow of the luminance signal, the dashed line represents the carrier color signal, the circled line represents the color difference signal R, and the crossed line represents the color difference signal B.

Reference numeral 9 denotes a composite signal generator. The composite signal is input to a video device 16 through a composite input terminal 12. Reference numeral 10 denotes a video camera that outputs a YC signal, and 11 denotes a video camera that outputs a composite signal and a component signal. Each video camera is connected to a video device 16 via a camera cable 15.

In the video device 16, signals are selected by switches 13 and 14 (from the top, switching of composite / YC / component). As a result, a terminal A receives a composite or luminance signal, and a terminal B receives a carrier color signal or color difference signal R. However, the color difference signal B appears at the terminal C depending on the setting states of the switches 13 and 14, respectively.

Problems to be Solved by the Invention However, in the above-described conventional configuration, in order to confirm a signal output from a connected signal source or a camera and a selection state of a device handling the signal, the output of the signal source must be checked. It is necessary to check the type and state with another monitor device before inquiring about the state of the selection in the selection unit, and there is a problem that the setting error of the selection unit is likely to occur.

The present invention has been made in view of the above problems, and has as its object to provide an apparatus that detects whether the setting of a selection unit is appropriate or incorrect for an input signal.

Means for Solving the Problems The present invention achieves the above object, a composite video signal,
In a device that receives and handles any two or more of a luminance signal and a carrier chrominance signal, and a luminance signal and two types of color difference signals, a selection unit that selects each signal, and a synchronization signal in an output signal of the selection unit And a color subcarrier detector that detects a color subcarrier, a logic circuit that obtains a signal indicating a setting state of a selection unit and a logic output of an output of each detector, and a logic circuit based on an output of the logic circuit. And a display unit for displaying, and the display unit distinguishes whether there is an error in the selection of the selection unit.

According to the above-described configuration, the present invention detects the type and state of the input signal, and inquires and collects the information and the setting state of the selection unit by a logic circuit, thereby detecting an error in the setting of the selection unit. .

Embodiment A description will be given below of an input signal selection setting error detection apparatus according to an embodiment of the present invention with reference to FIG.

In FIG. 1, terminals a and b correspond to the terminals a and b in FIG. 2, respectively, and the same signal flows through the corresponding terminals. That is, the composite signal or the luminance signal is output from the terminal A, and the carrier color signal or the color difference signal R is output from the terminal B.
Is output. Reference numeral 1 denotes a synchronization signal detector which receives an output from a terminal A and detects a synchronization signal. Reference numeral 2 denotes a burst detector, which similarly receives an output from terminal A as an input,
A color subcarrier (hereinafter referred to as a burst signal) is detected. 3
Is a burst detector 3 which receives the output from terminal b as an input,
Detect a burst signal.

The synchronizing signal detector 1 detects the presence or absence of a synchronizing signal from a functional point of view. However, since the output signal from the terminal A is a composite signal or a luminance signal, neither of these signals is input. Has "No sync signal L"
Is output. Next, the burst detector 2 detects the presence or absence of a burst signal of the output signal from the terminal A, and when the output signal from the terminal A is a composite video signal, the output becomes high level (H). However, in the case of a luminance signal, since there is no burst signal, a detection signal of “no burst L” is output. The burst detector 3 detects the presence or absence of a burst of the signal from the terminal B. If the signal at the terminal B is a carrier chrominance signal, the burst detector 3 outputs a "burst L" detection signal. Outputs a "burst-less L" signal.

The logic circuit composed of the OR circuits 4 to 7 and the AND circuit 8 is:
The result obtained from the above detection signal and the signal indicating the setting state of the signal selection unit are referred to, and an operation of creating a signal of “setting error L” is performed. In this embodiment, a setting error L is output by the AND circuit 8 for the following five states,
The display lamp 20 composed of a diode is displayed via the resistance transistor.

Hereinafter, for the five states determined by the logic circuit,
This will be described in more detail.

(1) The state where neither the signal composite signal nor the luminance signal from the terminal A exists. (2) The state where the setting of the selection unit is the YC signal and the composite signal is input to the terminal A instead of the luminance signal (this state). Is determined by the OR circuit 4.) (3) A state in which the setting of the selector is a component, and a composite signal is input to the terminal A instead of a luminance signal (this state is determined by the OR circuit 5) (4) A state in which the setting of the selection unit is a co-YC signal and a color difference signal R is input to the terminal B instead of the carrier color signal (determined by the OR circuit 6) (5) The selection unit setting is a component Yes, a state in which a carrier chrominance signal is input to the terminal B instead of the color difference signal R (determined by the OR circuit 7). The AND circuit 8 is provided when any of the above five states occurs. , And it outputs the error L "automatically, one which emits display lamp 20, thereby, it is possible to detect the setting error of the input selection unit.

Effect of the Invention As described above, the present invention can detect a setting error of the input selection unit for an input signal. Especially VT
If used in video equipment such as R, it is possible to prevent a shooting error due to an incorrect setting of input signal selection.

[Brief description of the drawings]

FIG. 1 is a block diagram of an input signal selection setting error detecting apparatus according to an embodiment of the present invention. FIG. 2 is a video camera or a video signal generator, a camera cable, a video device for receiving those signals, and FIG. 2 is a block diagram showing a signal selection unit and a signal flow of the video device. 1 ... Synchronous signal detector, 2,3 ... Burst detector, 4 ~
7: OR circuit, 8: AND circuit, 9: Composite signal generator, 10, 11: Video camera, 20: Display lamp.

Claims (1)

(57) [Claims] An apparatus for inputting and handling any two or more of a composite video signal, a luminance signal and a carrier chrominance signal, a luminance signal and two types of color difference signals, and selecting each of the above signals. Unit, a synchronization signal detector for detecting a synchronization signal in an output signal of the selection unit, a color subcarrier detector for detecting a color subcarrier, a signal indicating a setting state of the selection unit, and an output of each detector. Input signal selection, comprising: a logic circuit that obtains a logic output of: and a display unit that displays based on the output of the logic circuit, and distinguishes by selection whether or not there is an error in the selection of the selection unit. Setting error detection device.