JP3661427B2 - Signal switching device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a signal switching device used in video equipment or audio equipment having n positive integers and having n systems of video signal or audio signal input terminals.
[0002]
[Prior art]
An input terminal for an external device used for a video device or an audio device is generally provided on the rear surface for a constant connection device and on the front surface for a temporary connection such as a video movie. Signal switching devices are used to switch signals from tuners and signals from these input terminals, and the number of input systems is increasing.
[0003]
A conventional signal switching device will be described below with reference to the drawings.
A conventional signal switching device is shown in FIG. FIG. 2 is a block diagram showing the configuration of a conventional signal switching device. Here, a case where there are eight systems as input terminals will be described. In FIG. 2, 1 is a tuner, 2 is a first input terminal group on the rear surface of the video device or audio device, 3 is a second input terminal group on the front surface of the video device or audio device, and 5 is a Y / C separation. Means 41, composite video signal switching means, 42 audio signal switching means, 43 component video signal switching means, 60 computing means for controlling the signal switching means, and 7 operating means.
[0004]
The operation of the conventional signal switching device configured as described above will be described below.
[0005]
First, in the operation means 7, it is determined which input signal is to be selected. In the example of FIG. 2, when the tuner 1, the first input terminal group 2 or the second input terminal group 3 is selected, and the first input terminal group 2 or the second input terminal group 3 is selected. Select component video signal input or composite video signal input. The selection signal is the output 71 of the operation means 7 and the input 6040 of the calculation means 60. The arithmetic means 60 generates a control signal based on the transmitted signal, and outputs the control signal 6010, the output 6020, and the output 6030. The composite video signal switching means 41, the audio signal switching means 42, and the component video signal switching means 43 Each signal switching means is controlled. Through the above operation, the first input terminal group 2 on the rear surface of the video equipment or the audio equipment including the tuner 1, the component video input terminal, the composite video input terminal, and the audio input terminal, and the front of the video equipment or the audio equipment. Selection of an input signal from a certain second input terminal group 3 is performed.
[0006]
[Problems to be solved by the invention]
However, in the above-described conventional configuration, the input signal must be selected by the operation means 70 even if the front input frequently used temporarily is connected to the second input terminal group on the front of the video equipment or audio equipment. For this reason, there is a problem that it cannot be used immediately after connection, and in the case of monaural input for audio input, a connection cable for distributing outside must be prepared.
[0007]
SUMMARY OF THE INVENTION The present invention solves the above-described conventional problems, and an object thereof is to provide a signal switching device that selects an input signal in accordance with the use state of an input terminal.
[0008]
[Means for Solving the Problems]
In order to achieve this object, the signal switching device according to the present invention is such that n is a positive integer and n system input terminals, detection means for detecting the use state of the input terminals, and switching means for switching signals from the input terminals. And a calculation means for controlling the switching means by the output of the detection means.
[0009]
With this configuration, an input signal can be selected according to the usage status of the input terminal.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
According to the first aspect of the present invention, n is a positive integer, and there are n system input terminals, detection means for detecting the use state of the input terminals, switching means for switching signals from the input terminals, and detection And a signal switching device characterized by comprising an arithmetic means for controlling the switching means according to the output of the means, detecting that the input terminal is used, and controlling the switching means by performing a calculation based on the result. Thus, there is an effect that an input signal can be selected according to the usage status of the input terminal.
[0011]
Hereinafter, an embodiment of the present invention will be described with reference to FIG.
(Embodiment 1)
FIG. 1 is a block diagram showing a configuration of a signal switching device according to Embodiment 1 of the present invention. Here, a case where there are eight systems as input terminals will be described. In FIG. 1, 1 is a tuner, 2 is a first input terminal group on the rear surface of a video device or audio device, 3 is a second input terminal group on the front surface of the video device or audio device, and 5 is a Y / C separation. Means 6, arithmetic means for controlling the signal switching means, 7 operating means, 41 composite video signal switching means, 42 audio signal switching means, 43 component video signal switching means, 44 monaural / stereo selection switching means ( L), 45 is a monaural / stereo selection switching means (R), 201 is a first component video input terminal, 202 is a first composite video input terminal, 203 is a first audio input (L) terminal, and 204 is a first The first audio input (R) terminal 214 detects that the plug is inserted into the first component video input terminal 201 as being used by a mechanical switch. Detecting means 215, second detecting means 215 for detecting that the plug is inserted into the first composite video input terminal 202 as being used by a mechanical switch, and 216 a first audio input (L) terminal Third detection means for detecting that the state where the plug is inserted into 203 is being used by a mechanical switch, 217 is a plug inserted to detect the use status of the first audio input (R) terminal 204 Fourth detection means for detecting that the state is being used by a mechanical switch, 301 is a second component video input terminal, 302 is a second composite video input terminal, and 303 is a second audio input (L) terminal , 304 is a second audio input (R) terminal, and 314 is a state where a plug is inserted into the second component video input terminal 301 by a mechanical switch. The fifth detection means 315 detects that the plug is inserted into the second composite video input terminal 302 as being used by the mechanical switch, and 316 indicates the second sound. Seventh detecting means for detecting that a state where the plug is inserted into the input (L) terminal 303 is being used by a mechanical switch, 317 is a state where the plug is inserted into the second audio input (R) terminal 304 Is an eighth detecting means for detecting that the switch is being used by a mechanical switch.
[0012]
The operation of the signal switching device configured as described above will be described below.
First, in accordance with an instruction from the operation means 7, the calculation means 6 is informed that the tuner 1 or the input terminal group is to be used. In the calculation means 6, the use state of the input terminal is determined based on the first detection means 214, the second detection means 215, the third detection means 216, the fourth detection means 217, the fifth detection means 314, and the sixth detection. A control signal is transmitted based on the states of the input 605, input 606, input 607, input 608, input 609, input 610, input 611, and input 612 sent from the means 315, the seventh detection means 316, and the eighth detection means 317. Output 601, output 602, output 603, output 613, output 614, composite video signal switching means 41, audio signal switching means 42, component video signal switching means 43, monaural / stereo selection switching means (L) 44 The signal switching means of the monaural / stereo selection switching means (R) 45 is controlled.
[0013]
Next, the determination in the calculation means 6 according to the usage status of the input terminal and the switching method based on the determination will be described.
[0014]
First, when only one input terminal (video, audio (L), audio (R)) is used, the calculation means 6 performs an operation to select these. Thereby, the input terminal can be selected. For example, when the component video input terminal 201, the first audio input (L) terminal 203, and the first audio input (R) terminal 204 of the first input terminal group 2 are used, the audio switching means 42 is Input 422 and input 425, component video signal switching means 43 selects input 431 and input 434, monaural / stereo selection switching means (L) 44, and monaural / stereo selection switching means (R) 45 selects input 441 and input 452, respectively. Then, video input and audio input are selected.
[0015]
Next, when a plurality of input terminals are used, various switching methods are conceivable depending on the equipment used. For example, when used in a VTR, the arithmetic means 6 firstly replaces the front terminal with the rear terminal. Priority is given, and secondly, calculation is performed based on the rule that the component terminal is given priority over the composite terminal in the video. Accordingly, the priority is set in the order of the second component video input terminal 301 on the front surface, the second composite video input terminal 302 on the front surface, the first component video input terminal 201 on the rear surface, and the first composite video input terminal 202 on the rear surface. Give it. Based on the detection signals from the first detection means 214, the second detection means 215, the fifth detection means 314, and the sixth detection means 315, these are determined by the calculation means 6 using the priority. If the input terminal is used, a signal is selected, and even if it is not instructed by the operation means 7, the front input can be easily used for temporary use.
[0016]
Next, when there is only one monaural voice input, the calculation means 6 performs a calculation based on the rule that the voice is determined to be monaural when only one of the L and R pairs is used. Therefore, a case where there is a detection signal from any one of the third detection unit 216, the fourth detection unit 217, the seventh detection unit 316, and the eighth detection unit 317 will be described. When only the first audio input terminal (L) 203 or only the second audio input terminal (L) 303 is used, the monaural / stereo selection switching means (L) 44 selects the input 441 and the monaural / stereo. The selection switching means (R) 45 selects the input 451, and when only the first audio input terminal (R) 204 or only the second audio input terminal (R) 304 is used, monaural / stereo selection The switching means (L) 44 selects the input 442, and the monaural / stereo selection switching means (R) 45 selects the input 452. Accordingly, the same audio signal can be input to the audio inputs L and R, and monaural audio can be obtained.
[0017]
Next, when the input terminal is not used at all, the calculation means 6 performs a calculation based on the rule that the tuner 1 is used. The composite video signal switching means 41 selects the input 411 by the output 602, the audio signal switching means 42 selects the input 421 and the input 424 by the output 601, and the component video signal switching means 43 selects the input 433 and the input 436 by the output 603. The monaural / stereo selection switching means (L) 44 selects the input 441 by the output 614, and the monaural / stereo selection switching means (R) 45 selects the input 452 by the output 613. In this way, the tuner 1 output can be input to the video input and audio input.
[0018]
As described above, according to the present embodiment, detection means for detecting the use state of each input terminal, calculation means for calculating a detection result from the detection means and controlling each switching means, and switching means By providing the input signal, the input signal can be selected according to the use state of the input terminal. For example, in front input that is frequently used from video movies, etc., it can be used immediately after connecting to the input terminal. In the case of monaural input for audio input, L / R can be used without preparing a connection cable for external distribution. By connecting to either input, the same signal can be input to both L / R.
[0019]
As the terminal detection means in the above description, a device that detects that the plug is inserted into the terminal is used by a mechanical switch is used. In addition to this, a state in which the plug is inserted into the terminal is used. May be detected by a change in electrical impedance, or in the case of a video signal, the presence or absence of a synchronization signal may be detected.
[0020]
Note that the selection method in the case where a plurality of input terminals are used in the above description is merely an example, and an optimal priority method may be implemented depending on the device to be used and the arrangement of the terminals.
[0021]
【The invention's effect】
As described above, the present invention detects that the input terminal is being used, performs a calculation based on the result, and controls the switching means to select the input signal in accordance with the use status of the input terminal. An excellent effect that an apparatus can be provided is obtained.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a configuration of a signal switching device according to a first embodiment of the present invention. FIG. 2 is a block diagram showing a configuration of a conventional signal switching device.
2 First input terminal group 3 Second input terminal group 6 Arithmetic unit 7 Operating unit 41 Composite video signal switching unit 42 Audio signal switching unit 43 Component video signal switching unit 44 Mono / stereo selection switching unit (L)
45 Monaural / stereo selection switching means (R)
201 first component video input terminal 202 first composite video input terminal 203 first audio input (L) terminal 204 first audio input (R) terminal 214 first detection means 215 second detection means 216 second 3rd detecting means 217 4th detecting means 301 2nd component video input terminal 302 2nd composite video input terminal 303 2nd audio input (L) terminal 304 2nd audio input (R) terminal 314 5th Detection means 315 Sixth detection means 316 Seventh detection means 317 Eighth detection means

Claims (1)

Multiple video input terminals and audio input terminals,
Detecting means for detecting a use state of the video input terminal and the audio input terminal;
Switching means for switching a signal from the video input terminal;
Monaural / stereo selection switching means for switching a signal from the audio input terminal;
Arithmetic means for controlling the switching means and the monaural / stereo selection switching means by the output of the detection means ,
The video input terminal is given priority,
The switching means outputs the signal from the video input terminal having a high priority and the signal from the audio input terminal of the same system among the video input terminals detected to be used by the detecting means. And controlling the monaural / stereo selection switching means,
The audio input terminal comprises an L terminal and an R terminal,
The monaural / stereo selection switching means is
When both the L terminal and the R terminal are used, the switching means is controlled to output signals input from the L terminal and the R terminal, respectively, and only one of the L terminal and the R terminal is used. A signal switching device for controlling the monaural / stereo selection switching means so as to output a signal from the used terminal as a signal from both the L terminal and the R terminal .

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