JP2999772B2 - Selector device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a selector device for performing, for example, source selection of a plurality of video devices.

[Summary of the Invention]

The present invention relates to input / output of a composite color video signal.
In a selector device provided with an output terminal and an input / output terminal for a separation signal of a luminance signal and a chroma signal, the presence / absence of an input signal from an input terminal of a composite color video signal and / or separation of a luminance signal and a chroma signal A signal detection circuit that detects the presence or absence of an input signal from a signal input terminal, a signal from an input terminal of a separation signal of a luminance signal and a chroma signal, and a composite signal from a composite color video signal input terminal are Y / C A switch circuit for selecting a signal formed separately, and having a terminal for a separated signal of a luminance signal and a chroma signal by enabling the switch circuit to be set according to the detection output of the signal detection circuit. It is designed to be able to handle the case where video equipment that is not connected is connected.

[Conventional technology]

The AV selector is used for recording reproduction outputs of a plurality of video devices such as VTRs and video discs with a desired VTR, and selectively displaying outputs of the desired video devices on a monitor.

Conventionally, when transmitting video signals between video devices, NT
Video signals are often transmitted in the form of composite color video signals such as the SC system. For this reason, conventional AV
The selector receives a composite color video signal input /
Output terminals are arranged. Such a composite color video signal input / output terminal is called a video input / output terminal.

On the other hand, in recent years, in order to prevent interference between a luminance signal and a chroma signal, a high-band VTR is transmitted in a separate Y / C signal state in which the luminance signal and the chroma signal are separated. I have. Separate Y / C signal input /
The output terminal is called terminal S. High band
With the spread of VTRs, separate Y / C signals are increasingly used to transmit video signals between video devices. Therefore, it is conceivable to provide the AV selector with a terminal S for input / output of a separate Y / C signal.

However, the terminal S is not usually provided in a popular VTR or video disc.

Therefore, if the input channel source is a popular VTR
If the source of the output channel is a high-band VTR, the video signal is input as a composite color video signal to the input channel, while the video signal is input to the output source. May be input as a separate Y / C signal. In such a situation, no video signal can be sent from the input source to the output source.

Therefore, such a selector device is provided with a composite color video signal so that a video signal can be output as a separate Y / C signal to an output source even if the input source does not have a terminal S for the separate Y / C signal. A Y / C separation circuit is provided to separate the composite color video signal from the input terminal of Y / C into Y / C to form a separate Y / C signal.
If the input source does not have the terminal S, the composite color video signal from the input terminal of the composite color video signal is Y / C separated, and the separate Y / C signal thus formed is separated into the separate Y / C signal. Sent to the C signal line.

[Problems to be solved by the invention]

However, in the conventional selector, when the input source does not have the terminal S, the switching operation of the switch for inserting the Y / C separation circuit into the input line of the input composite color video signal is manually performed. This switch operation must be performed by the user while checking whether or not the input source has the terminal S. Therefore, operability is not good.

Therefore, the present invention provides a selector device in which a switch for inserting a Y / C separation circuit into an input line of an input composite color video signal can easily perform a switching operation without checking whether or not the input source has a terminal S. Is to do.

[Means for solving the problem]

The present invention relates to input / output of a composite color video signal.
In a selector device provided with an output terminal and an input / output terminal for a separation signal of a luminance signal and a chroma signal, the presence / absence of an input signal from an input terminal of a composite color video signal and / or separation of a luminance signal and a chroma signal A signal detection circuit that detects the presence or absence of an input signal from the signal input terminal, a Y / C signal from the input terminal of the separated signal of the luminance signal and the chroma signal, and a composite signal from the input terminal of the composite color video signal And a switch circuit for selecting a separately formed signal, and wherein the switch circuit can be set according to the detection output of the signal detection circuit.

When the switch circuit determines from the detection output of the detection circuit that the separated signal of the luminance signal and the chroma signal is not input, the switch circuit separates the composite color video signal into a luminance signal and a chroma signal and outputs the luminance signal and the chroma signal. Control is performed so that a signal separated from the signal is output from the output terminal.

[Action]

Switch 31 _{1-31 6,} as a source input for each channel, it is for switching whether to select the composite color video signal from either the terminal V selects separate Y / C signal from the terminal S. Also, switches 38 ₁ and 3
8 _2, each of the terminals of the monitor output terminal 8 ₁ and 8 ₂ S
A switch for selecting whether to output a separate Y / C signal transmitted through the signal lines 61 ₁ S and 61 ₂ S of the separate Y / C signal.

In each of the input terminals 3 ₁ to 3 _6, the level of the input signal from the terminal S is detected by the signal detecting circuit 51 ₁ S~51 ₆ S, the input signal level from the terminal V signal detecting circuit 51 ₁ V to
51 is detected by the ₆ V.

The detection output of the signal level detecting circuit 51 ₁ S~51 ₆ and 51 ₁ V~51 ₆ V is supplied to the microprocessor 41. In response to the detection output of the signal level detecting circuit 51 ₁ S~51 ₆ S and 51 ₁ V~51 ₆ V, the front panel 1 Indicator light 10 ₁ to 10 ₆
Lights up.

Further, in accordance with the detection output, the switch 31 ₁ to 31 _6, switches 38 ₁ and 38 ₂ are automatically switched.

〔Example〕

An embodiment of the present invention will be described in the following order.

a. Configuration of front and rear panels of AV selector b. Internal configuration of AV selector a. Configuration of front panel and rear panel of AV selector FIG. 1A shows the overall configuration of front panel 1 of an AV selector to which the present invention is applied. It is shown as. FIG. 1B shows the configuration of the rear panel 2 as a whole.

In this embodiment, there are six input channels and six output channels. In order to prevent interference between the luminance signal and the chroma signal, all the terminals are provided with terminals S for separate Y / C signals.

As shown in FIG. 1B, on the rear panel 2, a source input terminal 3, an AUX input terminal 4, a processor input terminal 5, a processor output terminal 6, a source output terminal 7, and a monitor output terminal 8 are arranged.

The source input terminal 3 includes source input terminals 31 to 36 for channels ₁ to ₆ . Source input terminal 3 ₁ to 3 ₆ of each channel, the terminal S of separate Y / C signal, and the terminal V of the composite color video signal,
The terminal A _L of the left audio signal, and a terminal A _R of the right audio signal. Each of these input terminals 3 ₁ to 3 _6, the output terminal of the video device is connected, respectively.

The AUX input terminal 4 is used when replacing an audio signal. AUX input terminal 4 is composed of a terminal A _L of the left audio signal, the terminal A _R of the right audio signal.

The processor input terminal 5 and the processor output terminal 6
Used to connect devices such as color correctors and video enhancers. Processor input terminal 5 and the processor output terminal 6 is composed of a terminal S of separate Y / C signal, and the terminal V of the composite color video signal, the terminal A _L of the left audio signal, the terminal A _R of the right audio signal.

Source output terminal 7, and an output terminal 7 _{1-7 6} from one channel to 6 channels. Output terminal 7 _{1-7 6} of each channel consists of a terminal S of separate Y / C signal, and the terminal V of the composite color video signal, the terminal A _L of the left audio signal, the terminal A _R of the right audio signal . Each of these source output terminal 7 _{1-7 6,} the input terminal of the video device are connected.

The monitor output terminal 8 has two monitor output terminals 8 ₁
And it consists of 8 _2. A monitor display is connected to the monitor output terminal 8. The monitor output terminal 8 has a terminal S for a separate Y / C signal, a terminal V for a composite color video signal, and a terminal for a left audio signal.
A _L and a right audio signal terminal A _R.

As shown in FIG. 1A, the front panel 1 has an S / V
A select switch 11, an AUX select switch 12, a processor select switch 13, and a source select switch 14 are provided. On the S / V select switch 11, the AUX select switch 12, the processor select switch 13, and the source select switch 14, lamps are turned on corresponding to the set switches so that the set state can be confirmed.

S / V selector switch 11 sets whether the video input of each of the source input terminal 3 ₁ to 3 ₆ and selects a composite color video signal from either the terminal V selects separate Y / C signal from the terminal S Switch. The S / V select switch 11 is a switch 11 ₁ corresponding to each channel from channel 1 to channel 6.
To 11 consists of six switches of up to _6.

If the terminal S is provided in the video device serving as the input source, in order to prevent interference between the luminance signal and the chroma signal,
It is better to select a separate Y / C signal from the terminal S.
When the terminal S is not provided in the video machine as an input source, it is necessary to select a composite color video signal from the terminal V.

An indicator lamp 10 is provided adjacent to the S / V select switch 11. This indicator light 10
Should a separate Y / C signal from terminal S be selected?
Is displayed for each channel as to whether or not to select a composite color video signal.

That is, the indicator lamps 10 ₁ to _{1 for} each channel
0 _6, as shown in FIG. 2, consists of two lamps 10A and 10B. As will be described in detail later, in one embodiment of the present invention, the signal detection circuit _{51 1 S~51 6 S, 51 1} V~51 6 V is provided. These signal detection circuits 51 ₁ S to 51 ₆ S, 51 ₁ V to 51
_{From the 6} V detection output, it is determined whether to select the separate Y / C signal from the terminal S or the composite color video signal from the terminal V. Based on this determination result, the indicator lamp 10 is turned on as follows.

That is, when it is better to select the separate Y / C signal from the terminal S, the upper lamp 10A is turned on.
When it is better to select the composite color video signal from the terminal V, the lower lamp 10B is turned on.

The AUX select switch 12 is a switch for selecting which channel from channel 1 to channel 6 is to be replaced with the audio signal from the AUX input terminal 4. The AUX select switch 12 is a switch 12 ₁ corresponding to each channel from channel 1 to channel 6.
Composed of six switches to 12 _6.

The processor select switch 13 is a switch for selecting which channel from channel 1 to channel 6 is to be connected with a device such as a color corrector or a video hancer. Processor select switch 13, corresponding to the respective channels from 1 channel to 6 channel consists of six switches to switch _{131-134 6.}

The source select switch 14 is a switch for setting which channel's input terminal is to output an input signal supplied to which channel's input terminal. Source select switch 14, 36 of the switch is constituted by two-dimensionally arrayed to switch 14 _1-1 to 14 _6-6. The row order corresponds to the input channel, and the column number corresponds to the output channel.

As will be described later, in one embodiment of the present invention, when performing a source select, three modes from mode A to mode C are used.
Different modes can be set. When set to mode C, video and audio can be set separately.

The setting state of the source select is as shown in FIG.
Appears divided into the upper display lights 14A and the lower display lamp 14B on each select switch 14 _1-1 to 14 _6-6, is shown a select state of the video in the upper display lights 14A, on the lower display lamp 14B is , The audio selection state is shown.

In one embodiment of the present invention, the S / V select switch 11, A
UX select switch 12, processor select switch 1
3. For example, all four setting states of the source select switch 14 can be stored. The front panel 1 has a memory set switch 15 and memory switches 16 _{1 to} 16 ₄
Is provided.

While pressing the memory set switch 15, press one of the memory switch 16 ₁ ~16 _4, S / V selector switch 11 at that time, AUX select switch 12, the processor select switch 13, the state of the source select switch 14 is pushed Are stored in correspondence with the memory switches 16 _{1 to} 16 ₄ .

The After such to store the set state, pressing one of the memory switch 16 ₁ ~16 _4, S / V selector switch 11, AUX select switch 12, the processor select switch 13, the source select switch 14 state Is set based on the storage state at that time.

When performing source selection with the source select switch 14, three modes from mode A to mode C can be set. On the front panel 1, a mode setting switch 17 for setting these modes is provided.

The mode A is a mode in which a select that forms a loop in which an input returns to an output is prohibited, and both audio and video are selected. In the case of general usage, it is necessary to prohibit source select forming a loop in which an input returns to an output. Also, audio and video are usually selected together. Therefore, when a general usage is performed, the mode A may be set.

Mode B is a mode in which both audio and video can be selected by setting a source that forms a loop. When the mode B is set, it is possible to use the device such that different devices are connected to the input channel and the output channel.

The mode C is a mode in which audio and video can be separately selected, which can be set by a source select forming a loop. In this mode, it is possible to set audio and video separately to set a complicated selection state.

It is possible to connect two systems of monitor receivers to this AV selector. Monitor select switch 19
Is a switch for selecting a channel to project the monitor receiver connected to the monitor output terminal _81. Monitor select switch 19, in correspondence with each channel consists of six switches of the switch 19 ₁ to 19 _6.

Monitor select switch 20, the monitor output terminal 8 ₂
Is a switch for selecting a channel to be displayed on a monitor receiver connected to the monitor. Monitor select switch 20, corresponding to each channel, switch 20 _1-2
0 consists of ₆ six switches of.

21 is a meter indicating the volume of the monitor, 22
A and 22B are monitor volume setting keys.

Reference numeral 23 denotes a power switch, 24 denotes a light receiving window for a remote control signal, 25 denotes a mode lock key, and 26 denotes an all clear key.

The camera-integrated such a so connection is easy portable video device VTR, the front panel 1, a source input terminal 3 ₆ 'is arranged. Instead of the source input terminal 3 ₆ disposed on the rear panel 2, it is possible to use this source input terminal 3 ₆ '.

b. Internal Configuration of AV Selector FIG. 4 shows the internal configuration of one embodiment of the present invention.

In FIG. 4, a switch group 31 is for switching between selecting a separate Y / C signal from a terminal S or selecting a composite color video signal from a terminal V as a source input of each channel. The switch group 31 is set according to the operation of the S / V select switch 11 provided on the front panel 1.

The switch group 32 is for switching to which channel the audio signal from the AUX input terminal 4 is to be replaced. The switch group 32 is set according to the operation of the AUX select switch 12 provided on the front panel 1.

The switch groups 33 and 34 are used to select a channel to which devices such as a color corrector and a video enhancer are connected. These switch groups 33 and 34 are processor select switches disposed on the front panel 1.
It is set by the operation of 13.

The switch group 35 is for setting a source select. The switch group 35 is set by operating the source select switch 14 provided on the front panel 1.

Switch group 36 is intended for switching the channel for projecting the monitor attached to the monitor output terminal _81, switch group 37, to switch the channel for projecting the monitor attached to the monitor output terminal ₈₂ It is for. The switch groups 36 and 37 include monitor select switches 19 and 20 disposed on the front panel 1.
Are set by the operation of.

Switches 38 ₁ and 38 ₂ each of terminals S of the monitor output terminal 8 ₁ and 8 _2, the separate Y / C signal signal lines 6
Output the separate Y / C signal transmitted through 6 ₁ S and 66 ₂ S or output the Y / C signal formed by the Y / C separation circuits 55 ₁ and 55 ₂
This is for selecting whether to output a separate signal.

These switch groups 31 to 37 and switches 38 ₁ and 38 ₂
Switching is performed according to a select signal from the microprocessor 41. The switch group 31 and the switches 38 ₁ and 3
8 _2, the detection output of the signal detecting circuit 51 ₁ S~51 ₆ S and 51 ₁ V~51 ₆ V, automatically switched. This switch group 31
And switches 38 ₁ and 38 ₂ may also be reset manually.

An operation signal is supplied from the operation switch 42 to the microprocessor 41. The operation switches 42 correspond to a number of switches arranged on the front panel 1.

Then, the setting state is displayed on the display circuit 43. The display circuit 43 corresponds to the lamp and the indicator lamp 10 provided on each select switch.

Switch groups 31 to 37 set by microprocessor 41
And each state of the switches 38 _1, 38 ₂ are to be stored in the memory 44. Backup power supply 45 for memory 44
Is provided.

In Figure 4, a source input terminal 3 ₁ to 3 _6, respectively, have a pin input S of separate Y / C signal, and the terminal V of the composite color video signal, audio signal and a terminal A _L and A _R ing. Incidentally, in order to simplify the explanation, it shows the terminal A _L and A _R for left and right audio signals as a single terminal.

In each of the input terminals 3 ₁ to 3 _6, separate Y / C signal from the terminal S is transmitted through respective signal lines 61 ₁ S~61 ₆ S, via respective switches 31 ₁ to 31 _6, the signal line Sent to 62 ₁ S to 62 ₆ S, respectively. The composite color video signal from the terminal V is connected to a signal line 61 ₁ V to 61
Transmitted via ₆ V each. Audio signal from the terminal A _L and A _R are transmitted through the respective signal lines 61 ₁ A~61 ₆ A.

At the same time, the respective input terminals 3 ₁ to 3 _6,
The level of the input signal from the terminal S is determined by the signal detection circuit 51 ₁ S to 51
₆ is detected by S, the level of the input signal from the terminal V is detected by the signal detecting circuit 51 ₁ V~51 ₆ V, terminal A _L and A level of the input signal from the _R signal detection circuit 51 ₁ A~51 ₆ Detected by A.

Signal level detecting circuit _{51 1 S~51 6 S, 51 1} V~51 6 V, 51 1 A~
Each of the detection output of 51 ₆ A is supplied to the microprocessor 41. This signal detection circuit 51 ₁ S to 51 ₆ S, 51 ₁ V to 51
₆ V, 51 ₁ A to 51 ₆ A
Indicator light 10 ₁ to 10 ₆ is turned on.

That is, when the detection output of the signal detecting circuit 51 ₁ S~51 ₆ S is large, is lit each upper lamp 10A of the indicator lamp 10 ₁ to 10 _6, indicating that it is better to select terminal S It is. And at this time, switch 31 ₁
-31 ₆ is switched to the a side.

Each of the detection output of the signal detecting circuit 51 ₁ S~51 ₆ S is small and the respective detection outputs of the signal detecting circuit 51 ₁ to 51 ₆ V is large, the respective lower indicator lamp 10 ₁ to 10 ₆ The lamp 10B is turned on, indicating that it is better to select the composite color video signal from the terminal V. Then, at this time, the switch 31 ₁ to 31 ₆ is switched to the b-side, respectively.

Signal lines when the switch 31 ₁ to 31 ₆ is switched to a side, respectively, separate Y / C signal from the terminal S at the respective source input terminal 3 ₁ to 3 ₆ via respective switches 31 ₁ to 31 ₆ Output to 62 ₁ S to 62 ₆ S respectively.

When the switch 31 ₁ to 31 ₆ is switched to the b-side, respectively, a composite color video signal from the terminal V of each of the source input terminal 3 ₁ to 3 ₆ Y / C separation circuit 52 ₁ -
52 after being converted into separate Y / C signals, respectively _6, through respective switches 31 ₁ to 31 _6, the signal line 62 ₁ S~62 ₆ S
Respectively.

In each of the input terminals 3 ₁ to 3 _6, an input audio signal from the terminal A _L and A _R are transmitted through the signal line 61 ₁ A~61 ₆ A of the audio signal, the switch 32 _{1-32 6} a
Supplied to the side input.

The b-side input switch 32 _{1-32 6,} the audio signal from the terminal A _L and A _R the AUX input terminal 4 is supplied.

When the switch 32 _{1-32 6} is switched to the a side, respectively, terminals A _L of each of the source input terminal 3 ₁ to 3 _6,
Audio signal from the A _R are output to the signal line 63 ₁ A~63 ₆ A through respective switches 321 _to 323 _6.

When the switch 32 _{1-32 6} is switched to the b-side, respectively, the audio signal is the signal from the AUX input terminal 4 line 6
3 is output to the _{1 A~63 6} A.

Switch _{33 1 S~33 6 S, 33 1} V~33 6 V, 33 1 A~33 6 A and the switch _{34 1 S~34 6 S, 34 1} V~34 6 V, 34 1 A~34 6 A is , For switching the insertion of the processor. Switch 33 ₁ S
To 33 and _{6 S, 33 1 V~33 6 V} , 33 1 A~33 6 A, the switch 34 ₁ S~34
The _{6 S, 34 1 V~34 6 V} , 34 1 A~34 6 A, respectively, is switched correspondingly.

The input terminal of the switch 33 ₁ S~33 ₆ S, signal lines 62 ₁ s to
A separate Y / C signal is supplied from 62 ₆ S, respectively.
The switch 33 ₁ V~33 of ₆ V input, signal lines 61 ₁ V~61
A composite color video signal from ₆ V is supplied.
The input terminal of the switch 33 ₁ A~33 ₆ A, the signal line 63 ₁ A~63
The audio signal from ₆ A is supplied.

Each a-side output terminal of the switch 33 ₁ S~33 ₆ S is connected to each of a side input terminal of the switch 34 ₁ S~34 ₆ S.
Switch 33 ₁ V~33 each a output end of ₆ V switch
It is connected to respective a side input of 34 ₁ V~34 ₆ V. Switch 33 ₁ A~33 ₆ each a output end of the A switch 34 ₁ A
To 34 are connected to respective a side input terminal of the ₆ A.

Further, each of the b-side output terminal of the switch 33 ₁ S~33 ₆ S is connected to the terminal S of separate Y / C signal processor output terminal 6. Each b output end of the switch 33 ₁ V~33 ₆ V is connected to the terminal V of the composite color video signal processor output terminal 6. Each b output end of the switch 33 ₁ A~33 ₆ A is connected to the terminal A _L and A _R audio signal processor output terminal 6.

Each b output end of the switch 34 ₁ S~34 ₆ S is connected to the terminal S of the processor input terminal 5, the switch 34 ₁ V~34
Each b-side input terminal of ₆ V is connected to the terminal V of the processor output terminal 5, each of the b-side output terminal of the switch 34 ₁ A~34 ₆ A is connected to the terminal A _L and A _R the processor output terminal 5 Is done.

Switch _{33 1 S~33 6 S, 33 1} V~33 6 V, the switch 33 ₁ A~33
₆ A is switched to the a side,
_{34 1 S~34 6 S, 34 1} V~34 6 V, when the switch 34 ₁ A~34 ₆ A is switched to the a side, respectively, the signal line 62 ₁ S~62
Separate Y / C signals from the ₆ S switches 33 ₁ S~33 ₆ S, signal lines 64 ₁ A~64 via respective switches 34 ₁ S~34 ₆ S
₆ is output from the A, the signal line 61 ₁ V~61 composite color video signal switch 33 from ₆ V _{1 V~33 6} V, the switch
34 ₁ V～34 a ₆ V output from the signal line 64 ₁ V~64 ₆ V via respective signal lines 61 ₁ A~61 ₆ audio signal from the A switch 33 ₁ A~33 ₆ A, switches 34 ₁ the A~34 ₆ a output from the signal line 64 ₁ A~64 ₆ a through respectively.

Switch _{33 1 S~33 6 S, 33 1} V~33 6 V, the switch 33 ₁ A~33
₆ A is switched to the b side,
_{34 1 S~34 6 S, 34 1} V~34 6 V, the switch 34 ₁ A~34 ₆ A is switched to the b side, respectively, are separate Y / C signal from the signal line 62 ₁ S~62 ₆ S is output from the terminal S of the processor output terminal 6 via the switch 33 ₁ S~33 ₆ S, signal lines
61 ₁ V~61 ₆ composite color video signal from V via the switch 33 ₁ V~33 ₆ V terminal V processor output terminal 6
Is output from the audio signal from the signal line 61 ₁ A~61 ₆ A is outputted from the terminal A _L and A _R of the processor output terminal 6 via the switch 33 ₁ A~33 ₆ A. The separate Y / C signal from the terminal S of the processor input terminal 5 is outputted from the signal line 64 ₁ A~64 ₆ A through respective switches 34 ₁ S~34 ₆ S, from the terminal V of the processor output terminal 5 the composite color video signal is output from the switch 34 ₁ V～34 ₆ signal lines 64 ₁ V a via respective V~64 ₆ V, terminal a _L and a audio signal from the _R switch ₃₄₁ of the processor input terminal 5 A~34 ₆ a signal line 64 ₁ a to via each
Output from 64 ₆ A.

Separate via signal lines 64 ₁ S to 64 ₆ S respectively
Y / C signal, the signal line 64 ₁ V~64 ₆ respectively interposed a composite color video signal V, the signal lines 64 ₁ A~64 ₆ respectively interposed audio signal A switch group 35, and switch group 36, 37 Supplied to

The switch group 35 sets which input channel is connected to which output channel.

Separate for each channel selected by switch group 35
Y / C signals are outputted from the signal line 65 ₁ S~65 ₆ S. Composite color video signal of each channel selected by the switch group 35 is outputted from the signal line 65 ₁ V~65 ₆ V. The audio signals of the channel selected by the switch group 35 is outputted from the signal line 65 ₁ A~65 ₆ A.

Separate Y / from each of the signal lines 65 ₁ S to 65 ₆ S
C signals are output from the terminal S of the source output terminal 7 _{1-7 6} via respective buffer 53 ₁ S~53 ₆ S. Composite color video signal from the respective signal lines 65 ₁ V~65 ₆ V is outputted from the terminal V of the source output terminal 7 _{1-7 6} via respective buffer 53 ₁ V~53 ₆ V. Signal line 65
₁ A～65 composite color video signal from each of ₆ A is outputted from the terminal A _L and A _R of the source output terminal 7 _{1-7 6} via respective buffer 53 ₁ A~53 ₆ A.

Moreover, the switch group 36, the channel is set to project on a display connected to the monitor output terminal _81. The switches 37, the channel is set to project to the receiver connected to the monitor output terminal _82.

The separate Y / C signal of the channel selected by the switch group 36 is output from the signal line 66 ₁ S. The composite color video signal of the channel selected by the switch group 36 is output from the signal line 66 ₁ V. Audio signal of the channel selected by the switch group 36 is outputted from the signal line 66 ₁ A.

The separate Y / C signal of the channel selected by the switch group 37 is output from the signal line 66 ₂ S. Composite color video signal of the channel selected by the switch group 36 is outputted from the signal line 66 ₂ V. Audio signal of the channel selected by the switch group 36 is outputted from the signal line 66 ₂ A.

Separate Y / C signals from signal lines 66 ₁ S and 66 ₂ S are connected to switches 38 ₁ through buffers 54 ₁ S to 54 ₂ S, respectively.
And supplied to the 38 ₂ a side input.

Composite color video signal from the signal line 66 ₁ V and 66 ₂ V is outputted from the terminal V of the monitor output terminal 8 ₁ and 8 ₂ of the composite color video signal respectively through the buffer 54 ₁ V and 54 ₂ V With the switch
38 are supplied to the ₁ and 38 ₂ of the b-side input terminal. The output of switches 38 ₁ and 38 ₂ is supplied to the terminal S of the monitor output terminal 8 ₁ and 8 ₂ of separate Y / C signal.

Audio signal from the signal line 66 ₁ and 66 ₂ A via respective buffers 54 ₁ A~54 ₂ A monitor output terminal 8 ₁
82 Output from the output terminals A _L and A _{R of 2} .

Switches 38 _{1 to} 38 ₂ are connected to signal detection circuits 51 ₁ S to 51 ₆ S, 51 ₁ V
The detection output of to 51 ₆ V, automatically switched.

That is, when the detection output of the signal detecting circuit 51 ₁ S~51 ₆ S corresponding to the channel selected by the switch group 36 is large, the switch 31 ₁ and 31 ₂ are switched to the a side. Signal detection output of the detection circuit 51 ₁ S~51 ₆ S corresponding to the channel selected by the switch group 36 is small and the detection output of the signal level detecting circuit 51 ₁ V~51 ₆ V is large, the switch 31
₁ and 31 ₂ are switched to side b.

When the switch 31 ₁ and 31 ₂ are switched to the a side, respectively, signals transmitted separate Y / C signal of the signal line 66 ₁ S and 66 ₂ S and through each via respective switches 38 ₁ and 38 _6, monitor output terminal 8 ₁ and 8 ₂ of the output terminal S
Is output from each.

When the switches 31 _{1 to} 31 ₂ are respectively switched to the b side, the composite color video signals from the signal lines 66 ₁ V to 66 ₂ V are converted into separate Y / C signals by the Y / C separation circuits 55 _{1 to} 55 _2. It is outputted from the output terminal S of the monitor output terminal 8 _{1-8 2.}

〔The invention's effect〕

According to the invention, in each of the input terminals 3 ₁ to 3 _6, the level of the input signal from the terminal S is the signal detecting circuit 51 ₁ S
To 51 ₆ are detected by S, the input signal level from the terminal V is detected by the signal detecting circuit 51 ₁ V~51 ₆ V, the signal level detecting circuit 51 ₁ S~51 ₆ S and 51 ₁ V~51 ₆ V The detection output is supplied to the microprocessor 41. This signal level detection circuit 51
In accordance with the detected output of the ₁ S～51 ₆ S and 51 ₁ V~51 ₆ V, with indicator lights 10 ₁ to 10 ₆ of the front panel 1 is turned on, the switch 31 ₁ to 31 _6, switches 38 ₁ and 38 ₂ is automatically switched. Therefore, it is not necessary to check whether the input source has the terminal S, and the operability is improved.

[Brief description of the drawings]

FIG. 1A is a front view showing the structure of a front panel according to one embodiment of the present invention, FIG. 1B is a rear view showing the structure of a rear panel according to one embodiment of the present invention, and FIGS. FIG. 4 is a partial enlarged view used for describing one embodiment of the present invention, and FIG. 4 is a block diagram used for describing the internal configuration of one embodiment of the present invention. Description of main reference numerals in the drawings 1: front panel, 2: rear panel, 11: S / V select switch, 12: AUX select switch, 13: processor select switch, 14: source select switch, 44: memory.

Continued on the front page (72) Inventor Akio Furukawa 6-35, Kita-Shinagawa, Shinagawa-ku, Tokyo Sony Corporation (72) Inventor Naoki Okayama 6-35, Kita-Shinagawa, Shinagawa-ku, Tokyo Sony Stock In-house (56) References JP-A-57-38091 (JP, A) JP-A-63-72280 (JP, A) JP-A-63-152385 (JP, U) JP-A-1-64274 (JP, U) ) Jpn.

Claims (2)

(57) [Claims] A video signal from a plurality of video sources is input, and a video signal in the form of a composite color video signal is input to each of the video sources.
And an input terminal group having a second input terminal for inputting a video signal in the form of a separated signal of a luminance signal and a chroma signal, and a composite color video signal input from the first input terminal. A first signal level detecting means for detecting a signal level, a second level detecting means for detecting a signal level of a separation signal of a luminance signal and a chroma signal inputted to the second input terminal; A first Y / Y converter for converting a video signal in the form of a composite color video signal input to the input terminal into a video signal in the form of a separated signal of a luminance signal and a chroma signal
C separating means, a video signal in the form of a separated signal of a luminance signal and a chroma signal input from the second input terminal, and the first Y / C
First switching means for manually or automatically switching between a video signal in the form of a separated signal of a luminance signal and a chroma signal converted by the separating means, and a desired video from the plurality of video sources Selecting means for selecting a source in the form of the composite color video signal and in the form of a separated signal of the luminance signal and the chroma signal, respectively; a luminance signal from the selected video signal in the form of the composite color video signal; A second Y / C separating unit for converting the video signal into a video signal in a format of a separated signal of a luminance signal and a chroma signal; a video signal in a format of a separated signal of a luminance signal and a chroma signal output from the selecting unit; 2. Manual or automatic switching between the luminance signal and the video signal in the form of a separation signal of the chroma signal converted by the Y / C separation means 2 A first output terminal for outputting a signal from the selected video source as a video signal in the format of the composite color video signal, and a format of a separation signal of the luminance signal and the chroma signal. An output terminal group having a second output terminal for outputting a video signal of the first signal level and / or the first switch means in response to an output of the first signal level detection means and / or an output of the second signal level detection means. And / or control means for controlling switching of the second switch means. 2. The apparatus according to claim 1, wherein the control means does not receive a separation signal of the luminance signal and the chroma signal from an output of the first signal level detection means and / or an output of the second signal level detection means. 2. The selector device according to claim 1, wherein when it is determined that the first switch means and / or the second switch means are switched to a signal side obtained by converting the composite color video signal into a luminance signal and a chroma signal. .