JP2000333036A - Video device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a video device that causes no loss and no waste by directly interconnecting television receivers with a cable and distributing a received television carrier signal to other without attenuating the signal. SOLUTION: The video device 1 having an input terminal 3 to which a television broadcast transmission signal is introduced and a tuner 8 connected to this input terminal 3 is configured with an amplifier 5 that is connected to the input terminal 3 and amplifies the transmission signal and with an output terminal 4 connected to an output of the amplifier 5. Since the amplifier connected to the input terminal amplifies the television broadcast transmission signal and the amplified signal is fed to the output terminal, the television voltage can be transmitted to a television receiver by connecting the television receiver directly to this output terminal by a cable without deteriorating the video image.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video apparatus such as a television receiver having an input terminal for connecting a cable from an antenna, and more particularly to a television apparatus for converting a carrier signal of a television broadcast to another television. The present invention relates to a video device to be distributed to a receiver.

[0002]

2. Description of the Related Art Generally, a television receiver or the like is provided with an input terminal on a rear surface of a main body of the television receiver so that a carrier of a television broadcast transmitted from an antenna is transmitted to a tuner. A high-frequency modulation device is known as an example of an accessory device provided in this type of video device (see Japanese Utility Model Application Laid-Open No. 63-56870). This one is
A high-frequency modulator, a high-frequency amplifier, a signal changeover switch, a power supply device, and a power supply changeover switch are provided. The signal changeover switch connects either the output of the high-frequency modulator or the output of the high-frequency amplifier to the antenna terminal of the television receiver. On the other hand, the power switch is linked with a signal switch, and the power supply device is switched to the high-frequency modulator or the high-frequency modulator according to the output of the high-frequency modulator or the output of the high-frequency amplifier input to the antenna terminal of the television receiver. It is configured to connect to an amplifier.

An antenna switching device has been proposed in which two tuners can independently receive an input signal from an antenna (see Japanese Patent Application Laid-Open No. Hei 4-274683). The switching device includes a signal distributor for distributing an input signal from an antenna, and a processing circuit for performing a predetermined process on an input signal from the antenna in a second signal path between the first and second relays. I have. This allows the first and second tuners to receive the input signal from the antenna independently of each other, so that the tuners can perform the receiving operation independently of each other.

Further, a modulator device having an amplifier and an RF modulator is known (Japanese Utility Model Laid-Open No. 2-1).
No. 11946). This modulator device has R
An F modulator inputs a video signal and an audio signal, converts the signal into a signal of a predetermined frequency, and outputs the signal to an antenna output terminal, while an amplifier amplifies a signal input to the antenna input terminal and outputs the amplified signal to the antenna output terminal. ing. Further, the antenna input terminal and the antenna output terminal are directly connected by a switch that turns off the power to the amplifier when the power is turned on.

[0005]

By the way, this type of television is provided with only an antenna input terminal on the main body of the receiver, and does not have an external output terminal that can be distributed to another television for output. Further, the above-described conventional high-frequency modulation device, modulator device, antenna switching device, and the like are each configured to transmit a transmission signal from an antenna or another video device to an antenna input terminal of the television, and transmit the transmission signal to another television. It was not amplified and sent to the side. For this reason, in general households equipped with a plurality of televisions, a loss has occurred as the number of installed televisions increases.

That is, if a plurality of televisions are provided, 1
The television carrier signal received by the book antenna is distributed by a distributor and transmitted to an antenna input terminal of each television via a cable. Since these televisions do not have an external output terminal capable of distributing and outputting to other televisions as described above, a cable is connected from each television installed in an adjacent room or the second floor to a distributor. I had to. For this reason, a distribution loss and a coupling loss occur due to the distributor, and a high-frequency television carrier signal is attenuated as the number of televisions installed increases, and there is a problem that image quality deteriorates. Also, since the cables are concentrated on the distributor, the wiring extension becomes considerably longer,
The use of cables increases the cost including construction costs, and in the case of exposed wiring, the aesthetics of the room is impaired.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and enables a television receiver or the like to be directly connected to each other by a cable, and distributes an inputted television carrier signal to another without attenuating it. It is an object of the present invention to provide a video device that does not cause loss or waste.

[0008]

In order to achieve the above object, according to the first aspect of the present invention, an input terminal into which a transmission signal of a television broadcast is introduced, and an input terminal connected to the input terminal. In a video device provided with a tuner,
An amplifier connected to the input terminal for amplifying the transmission signal and an output terminal connected to an output side of the amplifier are provided. The invention according to a second aspect is characterized in that a variable means for varying the amplification degree of the amplifier is provided. According to a third aspect of the present invention, there is provided a display device for displaying an amplification degree of the amplifier. According to a fourth aspect of the present invention, there is provided a detecting means for detecting the amplification degree of the amplifier, and detecting the amplification degree of the amplifier when receiving a detection signal indicating that the amplification degree has dropped below a certain level. And an amplification degree adjusting means for increasing the amplification degree.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an electrical block diagram showing a video device according to an embodiment of the present invention,
FIG. 2 is an explanatory diagram showing a cable connection state between the video devices. This video apparatus is applied to a general-purpose television receiver (television) 1, and has an antenna input terminal 3 and an antenna output terminal 4 provided on the back of a receiver main body 1a.
And an amplifier 5 is provided between them. In this example, a case will be described in which two televisions 1A and 1B arranged on upper and lower floors or in adjacent rooms are connected to each other by a cable 16 from an antenna 2. The antenna 2 is connected to the antenna input terminal 3 of the first television 1A.
And cable 1 from cable TV broadcasting station (CATV)
6 is connected, and a carrier signal for television broadcasting is introduced. The input side of the tuner 8 and the input side of the amplifier 5 are connected to the antenna input terminal 3.

This amplifier 5 is a high frequency amplifier (RF amplifier)
And well-known transistors suitable for amplifying television video signals that require a wide band with intermediate frequency amplification (IF amplification)
A video amplifier circuit is used. This transistor video amplifier circuit compensates for high frequency characteristics to avoid the problem of image blurring due to amplification, and compensates for low frequency characteristics to prevent instability problems. Built-in circuit. And this amplifier 5
Is connected to an antenna output terminal 4 provided near the antenna input terminal 3.

The antenna output terminal 4 is directly connected to the antenna input terminal 3 of the second television 1B by a cable 16 as shown in FIG. 2, and transmits the television broadcast carrier from the amplifier 5. ing. Further, the amplifier 5 is connected to the control unit 15 via the amplification degree detection circuit 6, and is connected to the control unit 15 via the amplification degree adjustment circuit 7. The amplification degree detection circuit 6 has an A / D
A converter is provided, which converts an analog transmission signal output from the amplifier 5 into a digital signal and sends it to the control unit 15 as a detection signal indicating the level of amplification. Further, the amplification degree adjusting circuit 7 includes a D / A converter, receives a digital control signal sent from the control unit 15, and changes an amplification degree of the amplifier 5 to adjust an analog signal. 5 is supplied.

A tuner 8 of the television is connected to a Y / C / A separation circuit 9 to which a signal from a control unit 15 is guided and converts a received signal of a selected channel into a Y / C / A separation circuit 9. To send to. The Y / C / A separation circuit 9 separates an input signal from the tuner 8 and converts a composite signal including a luminance signal (Y), a carrier signal (C), and a synchronization signal of the video signal into the video signal processing circuit 10 side. , While the audio signal (A) is not shown.
Send to 0. Further, a video signal including a synchronization signal is also supplied to the control unit 15 side. The video signal processing circuit 10 comprises a chroma IC, and includes a color signal output circuit, a sync separation circuit, a display circuit, and the like. The video signal processing circuit 10 is directly connected to the CRT 11 of the television, and is connected to the CRT 11 via the deflection circuit 12.

Further, the control unit 15 sends a control signal
A D (ON SCREEN DISPLAY) signal is guided, and the display circuit is controlled. The display circuit is configured to display a menu on the screen 1b of the CRT 11 and to display various setting items, signs indicating setting levels, and the like in response to an OSD signal transmitted by operating the remote controller 14. In this example, as shown in FIG. 3, the time setting, the channel setting, the amplification setting, and the like are displayed on the menu screen, and the “small”, “0”, and “large” levels are displayed on the amplification selection screen. , The amplification degree can be adjusted while watching the screen 1b of the television.

The control unit 15 includes a CPU, a ROM and an RA
A microcomputer comprising M, a tuner 8, a Y / C / A separation circuit 9, a video signal processing circuit 10,
In addition to the audio signal processing circuit 10, the amplification degree detection circuit 6, the amplification degree adjustment circuit 7, the reception unit 13, and the like, the circuit is connected in one direction or bidirectionally according to the function of each circuit (not shown) and its function. Note that the ROM stores character data such as characters and signatures to be displayed on the screen 1b of the CRT 11. In the RAM, a reference level of the amplification degree is stored as digital data for comparison with the level of a signal input from the amplifier 5 side. The receiving unit 13 receives an infrared signal from the remote controller 14 and transmits an electric signal to the control unit 1.
5. The control unit 15 controls the operation of the whole television, receives an operation signal from the remote controller 14, displays the video and audio of the television broadcast, and controls the amplifier 5 to adjust the level of the amplification degree. The control for displaying a menu, a sign indicating a setting level, or the like on the screen 1b of the CRT 11 is performed.

[0015] The above-described video apparatus is configured such that when a carrier signal of a television broadcast is introduced to the antenna input terminal 3 of the television 1A to which the cable 16 from the antenna 2 is connected first.
The signal is transmitted from the antenna input terminal 3 to the tuner 8 and the amplifier 5. When a carrier signal is transmitted from the output side of the amplifier 5 to the amplification degree detection circuit 6, the amplification degree detection circuit 6
The detection signal is sent to the control unit 15. This control unit 1
Numeral 5 receives the detection signal, compares it with a reference level of the amplification degree stored in the RAM in advance, and sends a command signal to the amplification degree adjusting circuit 7 when the detection level is lower than the reference level to increase the amplification degree. Let it. As a result, a carrier signal of an appropriate level without attenuation is transmitted to other televisions, so that the television broadcast can be viewed.

[0016] In addition to the automatic adjustment of the amplification degree, the first television 1A is connected to the second television 1B, the third television and the like, and the number of televisions to which signals are to be distributed increases. In such a case, the level of the amplification degree can be increased by operating the remote controller 14. At this time, the user operates the menu key of the remote controller 14 to display the menu items on the screen 1b of the CRT 11 as shown in FIG. Then, an amplification degree setting is selected from these items, and a display as shown in FIG. 3B is displayed on this screen 1b. On this screen 1b, a bar indicating the current amplification level is displayed on either the “small” side or the “large” side with “0” as the center. When the user operates the up side with the up / down key of the remote controller 14 when the amplification level is on the “small” side, the control unit 15 sends an amplification command to the amplification adjustment circuit 7 in accordance with the operation time. Signal and a video signal processing circuit 1
Send a display command signal to 0.

The video signal processing circuit 10 displays the set level of the amplification on the screen 1b of the CRT 11 in accordance with the display command signal, so that the user can change the amplification to the "large" side while looking at the bar being displayed. , Set to a level that seems appropriate. When this setting signal is input to the control unit 15,
A command signal corresponding to the set level is sent to the amplification adjustment circuit 7 to increase the amplification. As a result, a carrier signal at an optimal level without attenuation is transmitted to a plurality of television sets including the second television set 1B, so that television broadcasts can be viewed without deterioration in image quality or the like by each television set. Become. Further, unlike the related art, there is no need to concentrate the cables in the distributor, and the crossover wiring can be performed with one cable 16, so that the wiring extension is shortened, the usage amount of the cable 16 is reduced, and the wiring work is also easily performed. Become. In addition, there is an advantage that the number of exposed wirings can be reduced and the beauty of the room is not impaired. In the above embodiment, the case where the present invention is applied to a popular type television is described, but the present invention can also be applied to a television integrated with a video tape recorder. Further, it is needless to say that the present invention can be widely applied to various AV devices having an antenna input terminal and introducing a carrier signal of a television broadcast.

[0018]

As described above, according to the first aspect of the present invention, the transmission signal of the television broadcast is amplified by the amplifier connected to the input terminal and then transmitted to the output terminal side. If a television receiver or the like is directly connected to this output terminal by a cable, television broadcast images can be transmitted without deterioration. Further, since the transmission signal can be distributed without using the distributor as in the related art, the use of the distributor and the cable can be greatly reduced. Further, since the invention according to claim 2 includes the variable means for varying the amplification of the amplifier, there is an advantage that the amplification can be varied to an appropriate level according to the level of the transmission signal. Further, since the invention according to claim 3 is provided with the display means for displaying the amplification degree of the amplifier, there is an advantage that the amplification degree can be changed to an optimum state while visually confirming this display. Further, the invention according to claim 4 increases the amplification degree of the amplifier when receiving a detection signal indicating that the amplification degree has dropped below a certain level,
There is an advantage that a television broadcast transmission signal can be distributed while always maintaining the optimum level.

[Brief description of the drawings]

FIG. 1 is an electrical block diagram showing a video device according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a cable connection state between the video devices.

FIG. 3 is an explanatory diagram showing a setting state of an amplification degree displayed on a screen of the video device.

[Explanation of symbols]

 Reference Signs List 1 video device 3 input terminal 4 output terminal 5 amplifier 8 tuner

Claims (4)

[Claims] A video apparatus comprising: an input terminal into which a transmission signal of a television broadcast is introduced; and a tuner connected to the input terminal, an amplifier connected to the input terminal to amplify the transmission signal. And an output terminal connected to the output side of the amplifier. 2. The video device according to claim 1, further comprising a variable unit configured to vary an amplification degree of the amplifier. 3. The video device according to claim 1, further comprising display means for displaying the degree of amplification of the amplifier. 4. A detecting means for detecting the amplification of the amplifier, and an amplification adjusting means for increasing the amplification of the amplifier when receiving a detection signal indicating that the amplification has dropped below a certain level from the detecting means. The video device according to any one of claims 1 to 3, further comprising: