JPH06113226A - Monitor device - Google Patents

Abstract

PURPOSE:To recognize a visit of a visitor on a television receiver without interruption of a program being watched. CONSTITUTION:A television broadcast signal received by an antenna and a camera television signal of ch1 or ch2 from a television camera 20 are sent through a coaxial cable 22. A demodulation circuit 38 demodulates the television broadcast signal to give the broadcast video signal to a pattern output circuit 46, a demodulation circuit 40 demodulates the camera television signal to give the camera video signal to the pattern output circuit 46. The pattern output circuit 46 displays the camera video signal onto a master pattern 12a of the television receiver 12 at no input of a control signal and displays the broadcast video signal on the master pattern 12a and the camera video signal onto the slave pattern 12b at the input of the control signal. When a DC voltage +Vc superimposed on the signal through the cable 22 is decreased by closing a switch 30 connecting to the cable 22, a CPU 43 generates the control signal.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a monitor device capable of monitoring a distant place by using a television camera, and more particularly to a monitor device which receives a television broadcast.

[0002]

2. Description of the Related Art Conventionally, in a general household, a television camera and a push button switch are arranged in a front door, and when a visitor operates a front push button, an image of the visitor captured by the front television camera is displayed. The screen of the television receiver in the home where the television program was displayed until now switches,
There was a monitor that alerted the guests.

[0003]

However, the above-mentioned notifying device has a problem that, when there is a visitor, a television program which has been enjoyed until now is interrupted on the way.

The present invention provides a monitor device capable of displaying an image of a television camera provided in another place without interrupting the display of an image of a television program which has been viewed up to now. The purpose is to

[0005]

In order to achieve the above-mentioned object, the present invention modulates a carrier wave by a transmission television signal received from an antenna and transmitted from a transmitting station and a video signal imaged by a television camera. A transmission path for transmitting the camera television signal, and a first demodulation means provided at an end of the transmission path for demodulating the transmission television signal and outputting a baseband transmission video signal.
Second demodulation means provided at an end of the transmission path for demodulating the camera television signal to output a baseband camera video signal, the baseband transmission video signal and the baseband camera video signal When the control signal is not input, the baseband camera video signal is displayed on the screen of the television receiver, and when the control signal is input, one of the parent screen and the child screen of the screen of the television receiver is input. , A screen output means for displaying the baseband transmission video signal and displaying the baseband camera video signal on the other of the parent screen and the child screen, a DC signal source superimposed on the transmission path, and the transmission. An open / close switch connected to the path for connecting and disconnecting the DC signal of the DC signal source, and a control signal for generating the control signal according to the connection and disconnection of the DC signal And forming means, it is intended to comprise.

The television camera and the open / close switch can be arranged outdoors, for example, at the entrance.

[0007]

According to the present invention, the transmission television signal received by the antenna is supplied to the first demodulation means via the transmission path, and the baseband transmission video signal is output from the first demodulation means to the screen output means. To be done. Further, the camera television signal from the television camera is also supplied to the second demodulation means via the transmission path, and the baseband camera video signal is output from the second demodulation means to the screen output means. The screen output means displays the baseband transmission video signal on the screen of the television receiver when the control signal is not supplied. On the other hand, the DC signal from the DC signal source is also transmitted to the transmission path, and the DC signal is interrupted by interrupting the open / close switch, and the control signal generating means generates the control signal in response to this, and this is the screen output means. Is supplied to.
In response to this, the screen output means displays the baseband transmission video signal on one of the main screen and the subscreen of the screen of the television receiver, and displays the baseband camera video signal on the other of the main screen and the subscreen. Display it.

[0008]

EXAMPLE In this example, as shown in FIG.
A normal television receiver 12 provided therein is used, and a baseband video signal and a baseband audio signal are input from the parent-child screen output device 14 to this television receiver 12. A plurality of television signals are input to the parent-child screen output device 14, and the switch panel 16 is operated to display an arbitrarily selected one-wave television signal only on the parent screen 12a of the television receiver 12. In addition, while the child screen 12b is turned off, the arbitrarily selected one-wave television signal is displayed on the parent screen 12a of the television receiver 12, and the separately selected one-wave television signal is also displayed. It is possible to turn on the screen 12b and switch to a state displayed on the screen 12b, or to switch the parent screen 12a and the child screen 12b.

The parent-child screen output device 14 receives, as television signals, television broadcast signals of various channels received by an antenna 18 provided outdoors and a camera television from a television camera 20 provided, for example, at a front door. John signal and is input. The TV camera 20
A modulation device is provided, and a carrier wave of a channel not used in the area where this monitor device is installed, for example, a carrier wave of channel 1 or channel 2 is modulated by an image pickup signal from the television camera 20 to generate a camera television signal. Is generating. This camera television signal is transmitted by the coaxial cable 22, and
It is mixed with each television broadcast signal received by the antenna 18 by the mixer 24 interposed in the coaxial cable 22 and input to the parent-child screen output device 14.

From the parent-child screen output device 14 to the coaxial cable 2
DC voltage is applied to 2 (therefore, mixer 2
4 is an energizing type. ), This DC voltage is supplied to the switch box 28 provided in the vicinity of the television camera 20 via the energization type mixer 26. This switch box 28 is provided with a push button switch 30,
By pressing the push button switch 30, a control signal is supplied to the parent-child screen output device 14, and the parent-child screen output device 1
4 turns on the child screen 12b from the state in which a certain one-wave television broadcast is displayed only on the parent screen 12a, and displays the image from the television camera 20 on it.

Therefore, as shown in FIG. 1, in the parent-child screen output device 14, the mixed signal of the television broadcast signal and the camera television signal supplied to the input terminal 32 is
It is supplied to the two-way divider 36 via the capacitor 34, where the television tuner demodulation circuit 38 and the channel 1 are supplied.
Alternatively, it is distributed to the two-tuner demodulation circuit 40.

The television tuner demodulation circuit 38 demodulates the television broadcast signal of the channel designated by the selection signal from the control CPU 43, which will be described later, to obtain a baseband television broadcast video signal and a baseband television broadcast audio signal. And output signals. This baseband television broadcast audio signal is supplied to the television receiver 12 via the audio output terminal 42.

The channel 1 or 2 tuner demodulation circuit 40 demodulates the camera television signal and outputs a baseband camera video signal. The baseband camera video signal and the baseband television broadcast video signal are supplied to the parent-child screen change circuit 44.

The parent-child screen change circuit 44, in accordance with the change control signal from the control CPU 43, selects the base band television broadcast video signal or the baseband camera video signal, which is the parent screen, from the screen output circuit 46. The screen output circuit 4 is the one that makes the child screen to the parent screen input terminal of
6 to the sub-screen input terminal.

In the screen output circuit 46, when the parent-child screen command signal is input from the control CPU 43, the video signal supplied to the parent screen input terminal becomes the parent screen, and the video signal supplied to the child screen input terminal is the child screen. Both video signals are processed so as to form a screen, and when the command signal is not input from the control CPU 43, the video signal is processed so that only the main screen is displayed and the sub screen is turned off. The video signal that has undergone any of these processes is output to the video output terminal 4
It is supplied to the television receiver 12 via 8.

The control CPU 43 is a switch panel 16
In response to the operation of, the selection signal to the television tuner demodulation circuit 28 is generated. That is, the selection of the receiving channel is performed according to the operation of the switch panel 16. Further, according to the operation of the switch panel 16, it is determined which of the baseband television broadcast video signal and the baseband camera video signal is the parent screen and which is the child screen. That is, the status of the change control signal is changed according to the operation of the switch panel 16. Further, according to the operation of the switch panel 16, it is determined whether or not to display the child screen. That is, whether to generate the parent-child screen command signal is determined according to the operation of the switch panel 16.

The control CPU 43 has a switch input terminal 5
0, and when this terminal 50 is low level, the parent-child screen command signal is not generated, but when this terminal 50 is high level, the parent-child screen command signal is generated. When the terminal 50 becomes high level, the control CPU 43 operates the melody IC 52 for a predetermined time,
The audio signal of a specific melody is supplied to the amplifier 54. The amplified output is amplified by the speaker 56.

A resistor 52 is connected to the switch input terminal 50.
DC voltage of + Vc is applied via
The collector of the switching transistor 54 is connected to the switch input terminal 50, and the emitter thereof is grounded. The base of the transistor 54 is applied with a DC voltage of + Vc via resistors 56 and 58. The connection point of both resistors 56 and 58 is connected to the input terminal 32 via the high frequency blocking coil 60.
Therefore, the DC voltage of + Vc is transmitted to the switch box 28 via the coaxial cable 22 and the mixers 24 and 26.

In this switch box 28, + V supplied through the high frequency blocking coil 62 and the diode 64.
The capacitor 66 is charged by the DC voltage of c. In parallel with the capacitor 66, the push button switch 30
And a series circuit of a resistor 68 are connected. The connection point between the push button switch 30 and the resistor 68 is connected to the base of the switching transistor 72 via the resistor 70, and the emitter is grounded. The collector is connected to the connection point between the diode 64 and the high frequency blocking coil 62. A capacitor 74 is connected in parallel with the collector / emitter of the transistor 72.

Therefore, when the push button switch 30 is not pressed, the switching transistor 72 is in the off state, and the DC voltage of + Vc is applied to the base of the switching transistor 54 via the resistors 56 and 58. The switching transistor 54 is in the ON state. Therefore, the control input terminal 50 is at a low level.

When the push button switch 30 is pushed, the electric charge of the capacitor 66 flows through the switch 30 and the resistor 70,
The switching transistor 72 is turned on and the resistor 5
The potential at the connection point of 8, 56 decreases. As a result, the switching transistor 54 is turned off, and the control input terminal 5
0 has a high potential. Therefore, the control CPU 43 supplies the parent-child screen command signal to the screen output circuit 46, so that the screen output circuit 46 turns on the child screen and displays the video imaged by the television camera 20 on it. Also, control CPU
43 operates the melody IC 52 for a predetermined time to notify that the push button switch 30 has been operated.

Therefore, when there is a visitor at the entrance and the push button switch 30 is operated, the image of the visitor captured by the television camera 20 is displayed on the child screen 12 of the television receiver 12, and the melody becomes a melody. That is, it is possible to recognize who the visitor is, without interrupting the broadcast program that has been watched until now.

In the above embodiment, the image of the TV camera 20 is displayed on the child screen 12b. On the contrary, the parent screen 12 is displayed.
The video of the television camera 20 may be displayed on a and the video of the broadcast program that has been viewed so far may be displayed on the sub-screen 12b. In the above embodiment, the television camera 20
Although it was installed at the entrance, it can be installed at other places. Although the push button switch 30 is provided near the television camera 20, it may be provided near the parent-child screen output device 14, for example.

[0024]

As described above, according to the present invention, the DC signal superimposed on the transmission path is intermittently operated by operating the switch means, and the control signal generating means displays the control signal in response to this. Supply to the output means, the screen output means to display the baseband camera signal on one of the main screen and the subscreen of the television receiver, and the baseband transmission video signal on the other of the main screen and the subscreen, respectively. It is possible to know the video content from the TV camera without interrupting the programs that have been viewed until now. For example, if only switching from parent screen display to parent-child dual screen display, if the transmitter is installed at a position where infrared rays from the remote control infrared transmitter reach the television receiver capable of parent-child dual screen display. Good. However, in a place where infrared rays do not reach, for example, an outdoor visitor uses the above transmitter to switch from the parent screen only display to the parent and child screen display as in the present invention in order to notify the visit. You cannot do it. On the other hand, in the present invention, since the control signal for switching is performed by connecting and disconnecting the DC signal superimposed on the transmission path with a switch, switching can be performed from a considerably distant place. .

[Brief description of drawings]

FIG. 1 is a circuit diagram of an embodiment of a monitor device according to the present invention.

FIG. 2 is a diagram showing a usage state of the embodiment.

[Explanation of symbols]

12 television receiver 20 television camera 22 coaxial cable (transmission path) 30 push button switch 38 television tuner demodulation circuit (first demodulation means) 40 1 or 2 channel tuner demodulation circuit (second demodulation means) 43 for control CPU (control signal generation means) 46 screen output circuit (screen output means)

Claims (2)

[Claims] 1. A transmission path for transmitting a transmission television signal received by an antenna and transmitted from a transmission station, and a camera television signal in which a carrier wave is modulated by a video signal picked up by a television camera, and the transmission path. A first demodulating means provided at an end portion of the base station for demodulating the transmission television signal to output a baseband transmission video signal; and a baseband for demodulating the camera television signal provided at an end portion of the transmission path. Second demodulation means for outputting a camera video signal, the baseband transmission video signal and the baseband camera video signal are input, and the baseband camera video signal is displayed on the screen of a television receiver when a control signal is not input. And when the control signal is input, the base bar is displayed on one of the parent screen and the child screen of the screen of the television receiver. Connected to the transmission path, a screen output means for displaying a video signal to be transmitted and displaying the baseband camera video signal on the other of the parent screen and the child screen, a DC signal source superimposed on the transmission path, and the transmission path. A monitor device comprising: an open / close switch for connecting / disconnecting a DC signal of the DC signal source; and a control signal generating unit for generating the control signal according to the connection / disconnection of the DC signal. 2. The monitor device according to claim 1, wherein the television camera and the open / close switch are arranged outdoors.