JP2006254205A - Television receiving amplifying device, receiving terminal device, and television receiving system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a television receiving amplifying device having a wide dynamic range. <P>SOLUTION: This amplifying device consists of input terminals which are for inputting signals from a plurality of antennas and with the same in number with the antennas, first signal attenuation means which are for attenuating the television signals inputted from the input terminals and when the same in number with the antennas, a mixing means for making a composite signal from the output signals generated by being attenuated in the first signal attenuation means; a second signal attenuation means for attenuating this composite signal; an amplification portion for amplifying the composite signal attenuated by the second signal attenuation means; an output branching means for outputting the composite signal amplified by the amplification means to the output terminal side and branching a part of the amplified composite signal; an automatic gain control means for generating a control voltage for controlling the quantities of attenuation of the first signal attenuation means and the second signal attenuation means on the basis of composite signals branched by the branching means, and a receiving portion equipped with a tuning/demodulation means for tuning to or demodulating a predetermined television signal, out of the composite signals outputted from the output branching means, and output terminals. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

The present invention relates to a television receiving amplifying apparatus mainly used for receiving a television broadcast, and more specifically, an amplifying apparatus mainly used for a mobile body and receiving terrestrial digital broadcasting, and a receiving system using the same. About.

Conventionally, a television receiving amplifying device is used by being attached in the vicinity of an antenna for television broadcasting, and a television receiving amplifier is attached in the vicinity of a terminal side device such as a television or a VTR. Since the former is mounted in the vicinity of the antenna, it is impossible for one builder to perform gain adjustment, attenuator, etc. while watching TV images, and the work efficiency is extremely poor.
On the other hand, in the latter case, the input level to the amplifying device is lowered and C / N may be deteriorated due to transmission loss of the coaxial cable interposed between the antenna and the amplifying device. Therefore, in order to solve such a problem, a device in which an amplification device is divided into a first amplification unit installed in the vicinity of the antenna and a second amplification unit installed in the vicinity of the terminal side device has been proposed. The signal received by the television antenna is input to the first amplifying unit via the coaxial cable. The input signal is output from the first amplifying unit after passing through the power source separation filter after the first amplifier or attenuator is selected by the relay as the switching means. This selection is performed by turning on and off the switch provided in the second amplifying unit, so that the power supply separation filter of the second amplifying unit, the coaxial cable, and the power supply separation of the first amplifying unit are separated from the power supply provided in the second amplifying unit. The power is turned on and off to the relay through the filter, and the relay is switched by this.
Furthermore, an optimum power source is also supplied from the power source provided in the second amplifying unit to the first amplifier and the second amplifier provided in the second amplifying unit. The reception signal amplified in the first amplifying unit in this way is input to the second amplifying unit via a coaxial cable. This input signal passes through the power supply separation filter, is appropriately gain-adjusted by the variable attenuator, is amplified by the second amplifier, is output from the second amplifier, and is supplied to the television receiver 23.
Therefore, in this embodiment, not only can the gain be adjusted while watching the television receiver, but also the dynamic range of the amplifying device can be expanded by operating the switch. An amplifying device is provided.
(For example, see Patent Document 1)

JP-A-6-326534

However, according to the conventional TV receiving amplifying apparatus, considering that the terrestrial digital broadcasting started in the UHF band is received, until the television broadcasting is completely digitized in 2011, the current radio wave condition is In order to take measures to prevent new UHF band channels from increasing and analog reception and digital reception from affecting each other, the transmission power of terrestrial digital broadcast waves will be gradually increased. The situation changes. As a result, the multi-channel signal is input to the TV receiving amplifying device more than before, or the input level is increased, and an excessive level input signal is input to the amplifying device. The amplification device is distorted and disturbs the image.

By the way, terrestrial digital broadcasting can receive services such as data broadcasting as well as high-quality and high-quality broadcasting. As one of its usage methods, for example, in a mobile vehicle such as a private car or taxi, You can enjoy broadcasting. In such a case, a digital terrestrial antenna is installed on the roof of the car, and a terminal device such as a terrestrial digital broadcast tuner is installed in the car or in the trunk room. A receiving system such as that seen on an installed LCD TV is conceivable. In this system, the coaxial cable from the antenna needs to be pulled into the car, so the transmission line interposed between the TV antenna and the terminal side device is excellent in bendability because it is wired according to the vehicle body. In addition, a thin coaxial cable is suitable so that it can be easily pulled into the vehicle. However, a thin coaxial cable generally has a larger transmission loss than a coaxial cable equivalent to 5C used in a home joint reception system, and its value increases as the frequency band used increases. The signal level input to the digital terrestrial broadcasting tuner (for example, a terrestrial digital broadcast tuner) is lowered, thereby deteriorating the C / N characteristics of reception.

In view of this, a method for stably receiving television by interposing an amplifying device for TV reception between the antenna and the terminal side device is conceivable. To maintain a good C / N, the amplifying device is connected to the antenna. It is necessary to install it in the power feeding section or install it in the vicinity of the antenna. However, if an amplifier with high amplification is arranged near the antenna, there is a problem that oscillation may occur, or even if the problem of transmission is improved, the configuration of the amplifier circuit is required to increase the amplification. Increasing the number of parts and the structure of the case to improve shielding performance, resulting in an increase in the outer shape of the amplifying device, resulting in increased costs, as well as vehicle roofs, etc. There was a problem that it would be difficult to install.

Further, as in the conventional example, the amplifying device is configured by a first amplifying unit and a second amplifying unit, and the first amplifying unit and the second amplifying unit are connected by a coaxial cable. For example, a TV reception amplifying device with little deterioration of C / N can be made. However, in the circuit configuration as shown in the conventional example, the transmission power of the terrestrial digital broadcast wave is not full power or stable. Even if it is installed and adjusted in a state that is optimal for use in an area that is not published, the amplifying device is used when the number of channels is increased and the transmission power is increased in full digitalization after 2011 in terrestrial broadcasting. It is conceivable that an excessive input is input to the amplifier and the input of the amplifying device exceeds. In addition, considering that the electric field strength may change greatly in a short time when used in a mobile object such as a car, the second amplifying unit is used to cope with these input changes. Corresponding to changes in the input level by operating the provided switch has a problem that it is impossible to respond instantaneously when moving (ie during operation). Further, in order to enable operation, there is a problem that the installation location of the second amplification unit is extremely limited in order to make the switch operation cheap.
Therefore, the present invention has been made to solve such problems,
The purpose is to provide an amplifying apparatus for television reception.
Another object is to provide an amplifying apparatus for television reception with an automatic gain adjustment function.
Another object of the present invention is to provide a television receiving amplifying apparatus having a wide input level dynamic range.
Another object is to provide an amplifying apparatus for television reception including a first amplifying section, a second amplifying section, and a terminal side apparatus.
Another object is to provide an amplifying apparatus for television reception suitable for in-vehicle use.
Another object is to provide an amplifying apparatus for receiving television for enjoying terrestrial digital broadcasting on a mobile object.

In order to solve the above-mentioned problems, the invention of claim 1 is a television receiving and amplifying device for amplifying a television signal received from a plurality of antennas for receiving a television broadcast wave via a transmission line. In
The television reception amplifying device includes at least as many input terminals as the antennas for inputting signals from a plurality of antennas, and the same number of first antennas as the antennas for attenuating the television signals input from the input terminals. Signal attenuating means, mixing means for mixing the output signals attenuated in the respective first signal attenuating means and outputting them as synthesized signals, and second signal attenuating means for attenuating the synthesized signals output from the mixing means, , An amplifying unit for amplifying the combined signal attenuated by the second signal attenuating means, and outputting the combined signal amplified by the amplifying unit to the output terminal and a part of the amplified combined signal And an output branching means for branching the first signal attenuating means based on the combined signal branched by the output branching means so that the combined signal amplified by the amplifying unit has a predetermined level. And automatic gain control means for generating a control voltage for controlling the attenuation amount of the fine said second signal attenuation means, an output terminal, and a.

The invention of claim 2 is a receiving terminal apparatus for a television signal received by a plurality of antennas for receiving television broadcast waves and drawn from each antenna through a transmission line.
The reception terminal device includes at least the same number of input terminals as the antennas for inputting signals from a plurality of antennas, and the same number of first signals as the antennas for attenuating television signals input from the input terminals. Attenuating means, mixing means for mixing the output signals attenuated in the respective first signal attenuating means and outputting them as synthesized signals, second signal attenuating means for attenuating the synthesized signals output from the mixing means, An amplifying unit for amplifying the combined signal attenuated by the second signal attenuating means; and outputting the combined signal amplified by the amplifying unit to the output terminal side and a part of the amplified combined signal And an output branching means for branching the first signal attenuating means and the first signal attenuating means based on the combined signal branched by the output branching means so that the combined signal amplified by the amplifying unit has a predetermined level. An automatic gain adjusting means for generating a control voltage for controlling the attenuation amount of the second signal attenuating means, and a predetermined television signal is selected and demodulated from the synthesized signal output from the output branching means. And a receiving unit equipped with channel selection / demodulation means.

According to a third aspect of the present invention, in the television receiving device according to the first aspect and the receiving terminal device according to the second aspect, the signal is received by an antenna between each input terminal and each first signal attenuation means. A power supply superimposing means comprising: a capacitor that passes a television signal and blocks a DC power supply; and a choke coil that is connected to a connection point between the input terminal and the capacitor and passes the DC power supply and blocks the television signal. A preamplifier provided in a coaxial cable connecting an antenna for receiving broadcast waves and an input terminal can be supplied with power through a transmission line.
.

According to a fourth aspect of the present invention, the television receiving amplifying device according to the first or third aspect and the receiving terminal device according to the second or third aspect are configured to receive digital terrestrial broadcasting. did.

According to a fifth aspect of the present invention, there is provided a television receiver provided with at least a television receiving amplifying device or receiving terminal device for a television signal received by a plurality of television broadcast wave receiving antennas and drawn from each antenna by a transmission line. In the system,
The television receiving amplifying device is configured by using the television receiving amplifying device according to any one of claims 1, 3, or 4, or the receiving terminal device is claim 2, claim 3, or claim 3. The receiving terminal device according to any one of Items 4 is used.

According to the first aspect of the present invention, in a television reception amplifying apparatus for amplifying a television signal received by a plurality of antennas for receiving television broadcast waves and drawn from each antenna via a transmission line,
The television reception amplifying device includes at least as many input terminals as the antennas for inputting signals from a plurality of antennas, and the same number of first antennas as the antennas for attenuating the television signals input from the input terminals. Signal attenuating means, mixing means for mixing the output signals attenuated in the respective first signal attenuating means and outputting them as synthesized signals, and second signal attenuating means for attenuating the synthesized signals output from the mixing means, , An amplifying unit for amplifying the combined signal attenuated by the second signal attenuating means, and outputting the combined signal amplified by the amplifying unit to the output terminal and a part of the amplified combined signal And an output branching means for branching the first signal attenuating means based on the combined signal branched by the output branching means so that the combined signal amplified by the amplifying unit has a predetermined level. And automatic gain control means for generating a control voltage for controlling the attenuation amount of the fine said second signal attenuation means, it is arranged that consists of an output terminal,
By simply connecting multiple simple dipole antennas, the received signals from the antennas can be synthesized and terrestrial digital broadcasts can be stably received like omnidirectional antennas. In addition, when used in an area where the transmission power of terrestrial digital broadcast waves is not full power or is not stably output at present, it is installed in an optimal reception state in 2011. TV broadcasting will be completely digitized after the year, and even if a higher level signal is input to the amplifying device, if multi-channel radio waves are input from the current reception state, transmission power is increased, etc. , The optimum output level is automatically obtained.

According to the invention of claim 2, in a receiving terminal device for a television signal received by a plurality of antennas for receiving television broadcast waves and drawn from each antenna through a transmission line,
The reception terminal device includes at least the same number of input terminals as the antennas for inputting signals from a plurality of antennas, and the same number of first signals as the antennas for attenuating television signals input from the input terminals. Attenuating means, mixing means for mixing the output signals attenuated in the respective first signal attenuating means and outputting them as synthesized signals, second signal attenuating means for attenuating the synthesized signals output from the mixing means, An amplifying unit for amplifying the combined signal attenuated by the second signal attenuating means; and outputting the combined signal amplified by the amplifying unit to the output terminal side and a part of the amplified combined signal And an output branching means for branching the first signal attenuating means and the first signal attenuating means based on the combined signal branched by the output branching means so that the combined signal amplified by the amplifying unit has a predetermined level. An automatic gain adjusting means for generating a control voltage for controlling the attenuation amount of the second signal attenuating means, and a predetermined television signal is selected and demodulated from the synthesized signal output from the output branching means. Since it is configured to consist of a receiver with tuning and demodulation means,
For example, as a receiving device on the terminal side of a mobile object or the like, it is possible to provide a receiving terminal device with good convenience and mountability.

According to a third aspect of the present invention, in the television receiving device according to the first aspect and the receiving terminal device according to the second aspect, an antenna is provided between each input terminal and each first signal attenuation means. A power superimposing means comprising a capacitor that passes a received television signal and blocks a DC power supply, and a choke coil that is connected to a connection point between the input terminal and the capacitor and passes through the DC power supply and blocks the television signal; Since the preamplifier interposed in the coaxial cable connecting the antenna for receiving the television broadcast wave and the input terminal is configured to be able to supply power via a transmission line,
The dynamic range with respect to changes in input level is wide, and even if the received signal is small, it can be received without C / N degradation.

According to a fourth aspect of the present invention, the television receiving amplifying device according to the first or third aspect and the receiving terminal device according to the second or third aspect are configured to receive digital terrestrial broadcasting. So
For example, it is possible to provide a television reception amplifying apparatus and a receiving terminal apparatus suitable for receiving a terrestrial digital broadcast by a mobile body.

According to the invention of claim 5, there is provided at least a television reception amplifying device or a reception terminal device for television signals received by a plurality of television broadcast wave receiving antennas and drawn from each antenna by a transmission line. In a TV reception system,
The television receiving amplifying device is configured by using the television receiving amplifying device according to any one of claims 1, 3, or 4, or the receiving terminal device is claim 2, claim 3, or claim 3. Since it was configured using the receiving terminal device according to any one of Items 4,
Amplifying circuits with multiple automatic gain adjustment circuits are housed in the same case so that TV signals from multiple antennas can be combined, enabling stable TV reception with only simple connection work. It is possible to easily build a system that can.

Hereinafter, an example of an embodiment embodying the present invention will be described in detail with reference to the drawings.
FIG. 1 is a schematic block diagram showing an embodiment of a television reception amplifying apparatus according to the present application, and FIG. 2 shows a different embodiment of the television reception amplifying apparatus according to the present application. FIG. 3 is a schematic block diagram showing an embodiment of a receiving terminal apparatus according to the present application, and FIG. 4 is a schematic block diagram showing a different embodiment of the receiving terminal apparatus according to the present application. FIG. 5 is a schematic diagram showing a receiving system when the television receiving amplifying device or receiving terminal device of the present application is attached to the vehicle body.

A first embodiment of a television reception amplifying apparatus of the present application will be described with reference to FIG. In this figure, reference numeral 1 denotes an antenna for receiving a television broadcast. In the embodiment of the present application, three UHF antennas composed of dipoles are arranged apart from each other in order to receive a terrestrial digital broadcast by a mobile body such as an automobile. An example is shown.
A signal received by the antenna 1 is input from the input terminal Input of the television receiving amplifying device 2. The inputted television signal is inputted to the first signal attenuating means 12 for attenuating the television signal within a predetermined range. The first signal attenuating means 12 is a so-called π-type attenuator composed of, for example, a PIN diode, and is configured to obtain an attenuation amount corresponding to a control voltage generated in the automatic gain adjusting means 20 described in detail later. ing.
Although not shown in the figure, a VHF band signal composed of a capacitor and a coil or a mobile phone (for example, 800 MHz band) is used as a stop band between the input terminal and the first signal attenuating means 12. , A filter means such as a band pass filter configured to pass a UHF band signal may be provided.
Reference numeral 13 denotes mixing means for mixing the television signal attenuated by a predetermined level in the first signal attenuating means 12 and outputting it as a synthesized signal. The mixing means 13 is composed of a mixer formed by winding a polyurethane wire around a ferrite core, for example.

Reference numeral 15-1 denotes an amplifying unit for amplifying the combined signal output from the mixing means 13 to a predetermined level, and is a high-frequency amplifier circuit composed of transistors, ICs, etc. as high-frequency amplifier elements. . Next, the signal amplified to a predetermined level by the amplifier 15-1 is input to the second signal attenuating means 16. The second signal attenuating means 16 is a so-called π-type attenuator composed of, for example, a PIN diode, and is configured to obtain an attenuation amount corresponding to a control voltage generated in the automatic gain adjusting means 20 described in detail later. ing.
Next, the signal that has passed through the second signal attenuating means 16 is further amplified to a predetermined level in the amplifying unit 15-2. The amplifying unit 15-2 is also a high-frequency amplifying circuit configured by, for example, a transistor or an IC as an amplifying element, and the combined signal amplified to a predetermined level in the amplifying unit 15-2 is input to the branch output unit 17. The

In the embodiment of the present application, the output branching means 17 is a branch circuit composed of, for example, a branch coil formed by winding a polyurethane wire around a ferrite core, and outputs the output signal of the amplifier 15-2 to the output terminal Output side. A part of the amplified combined signal is output to the branch terminal 17a.
Further, the output of the output branching means 17 includes a capacitor for outputting the combined signal output from the output branching means 17 to the output terminal Output, and blocking the DC power supplied from the terminal side via the transmission line, An output side power source separating means 18 comprising a choke coil for blocking the synthesized signal is connected to the direct current power source in the television receiving amplifying device 2.
In the embodiment of the present application, the operation power source of the television reception amplifying device 2 is operated by a DC power source supplied from the terminal side via a coaxial cable. Power source such as a car cigarette lighter or a power source pressure generating means for generating a DC power source may be provided, and a DC power source may be obtained from the power source voltage generating means.

Further, the amplifying unit 15 is connected to the branch terminal 17a of the output branching means 17 through a filter means 19 (for example, a bandpass filter that passes through the UHF band), for example, a capacitor and a coil that passes a signal in a predetermined band. -2 detects the combined signal output from the branching terminal 17a of the output branching means 17 through the filter means 19 so that the combined signal amplified by -2 becomes a predetermined level, and based on this detected voltage, An automatic gain adjusting means 20 for generating a control voltage for controlling the attenuation amount of the first signal attenuating means 12 and the second signal attenuating means 16 is connected to the first signal attenuating means 12 and the second signal attenuating means 12. The signal attenuating means 16 is controlled by the control voltage generated by the automatic gain adjusting means 20, and the television receiving amplifying apparatus of the present application is used. Is to operate as an amplifier equipped with automatic gain control.

The automatic gain adjusting means 20 of the present application takes in a composite signal from the branch terminal 17a via the filter means 19 having a predetermined pass band and detects the intensity of the output level in the amplifying unit 15. A detection unit consisting of a detection circuit using a diode for detection and a smoothing circuit composed of a capacitor, a resistor, and the like, and a detection voltage output from the detection unit according to the intensity of the output level, and comparing it with a reference value Thus, it is configured to include an arithmetic unit having an arithmetic circuit composed of, for example, an operational amplifier and a resistor, for determining whether or not the output level exceeds the reference value.
In other words, the intensity of the output level in the amplification unit 15 is detected by the detection unit, and the detection voltage does not exceed the reference voltage (for example, the detection voltage of the output level when the distortion is within a predetermined range). When the detection voltage is higher than the reference voltage, a signal corresponding to the detection voltage is output as a control signal from the calculation unit. By this control signal, the first signal attenuator 12 and the first signal attenuator 12 are output. By controlling the second signal attenuating means 16, the amplifying unit 15 amplifies while performing automatic gain adjustment.
When the detection voltage is lower than the reference voltage, the signal output from the calculation unit is almost zero, the control voltage is not applied to the first signal attenuation means 12 and the second signal attenuation means 16, and the first The signal attenuating means 12 and the second signal attenuating means 16 are in a passing state in which the attenuation amount is substantially zero, and the automatic gain adjusting circuit operates as a normal amplifying unit 15 that does not operate.
According to the embodiment of the present application, the amplification unit 15 constituting the amplification device 2 is not limited to the example shown in the embodiment of the present application, and the number of stages and the arrangement may be changed as necessary.

Reference numeral 30 denotes a terminal-side device, which is interposed between the terminal-side power generation means 32 that generates at least the DC power source voltage from the commercial power source taken in by the AC plug 33 and the amplifying device 2. A DC power supply voltage is directed toward the amplifying device 2 and includes a capacitor that passes a composite signal from a transmission line and blocks the DC power supply voltage, and a choke coil that passes the DC power supply voltage and blocks the composite signal. A terminal-side power superimposing means 31 for transmission, and a reception / tuning means for selecting / demodulating a predetermined television signal from the composite signal input via the terminal-side power superimposing means 31 A portion 35 is provided.
Generally, the terminal device 30 may be a digital home appliance such as a television receiver or an HDD recorder, or a tuner for terrestrial digital broadcasting. In addition, the terminal-side device 30 is not limited to a commercial power supply as described above, and may be configured to take power from a socket of a cigarette lighter of a car.

FIG. 2 shows a different example of the first embodiment of the present application. In addition, what shows the same structure as the said Example attaches | subjects the same code | symbol, and abbreviate | omits detailed description. In this embodiment, a preamplifier 3 can be provided between the television receiving antenna 1 and the television receiving amplifying device 2.
The preamplifier 3 is configured to pass at least a VHF band signal or a cellular phone (for example, 800 MHz band) including a capacitor and a coil (not shown), for example, and a UHF band signal. For example, a filter means such as a band-pass filter, a high-frequency amplifier circuit composed of a transistor or an IC as a high-frequency amplifier, and a TV signal received by the antenna passes to the output side and is supplied from the TV receiving amplifier 2 And a power supply separating means comprising a choke coil that passes through the DC power supply and blocks the television signal.
Therefore, in order to operate the preamplifier 3, in addition to the above embodiment, the television received by the antenna between the input terminal Input of the television receiver amplifying device 2 and the first signal attenuating means 12 is used. An input-side power superimposing means 5 comprising a capacitor that passes a signal and blocks a DC power source and a choke coil that passes the DC power source and blocks the television signal is provided. 6 in this figure is a switch for selectively switching whether or not to allow current to pass, and is not limited to the embodiment and may not be provided.
In this embodiment, power generation means 23 and 31 are provided inside the television receiving amplifying device 2 and the terminal side device 30, and a DC power source is generated from a commercial power source via the AC plugs 25 and 33. The television receiver amplifying device 2, the preamplifier 3, and the terminal-side device 30 are configured to be operated by a power source. However, in the same manner as in the above-described embodiment, for example, power is supplied from a socket of a car cigarette lighter. The configuration is not particularly limited. .

Next, a receiving terminal device 50 including the television receiving amplifying device 1 of the present application will be described with reference to FIGS. In the following description, the same components as those in the television joint reception amplifying apparatus 1 of the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted. In this embodiment, at least a terminal provided with a channel selection / demodulation means for selecting and demodulating a predetermined television signal from the combined signal amplified by the television reception amplification device 1 and the television reception amplification device 1 described above. The receiving device 50 is configured by housing the side device 30 in the same housing, and is further improved in mountability. Note that the difference between the embodiment of FIG. 3 and FIG. 4 is whether or not the DC power supply can be fed from the input terminal to the preamplifier provided on the antenna side.

Next, a specific wiring system example using the receiving terminal device 50 of the present application will be described with reference to FIG. In this embodiment, at least three antennas 1 are installed on the window glass of a moving body of the car 100, for example.
In this figure, an antenna 1 is a UHF digital broadcasting antenna composed of a dipole antenna in which an antenna element is formed using a conductive material on a surface of a film-like insulator having good transparency, for example, on the front side and the left and right side surfaces, respectively. Any antenna can receive optimally by disposing it at a position far behind (the antenna behind the right side is not shown) and facing in three directions. Note that the antenna installation state shown in the embodiment is not particularly limited to this arrangement. Also, the shape of the antenna is not limited to the embodiment.
The preamplifier 3 in the embodiment of the present application is connected to the antenna output and a coaxial cable in the vicinity of the antenna, for example, but the preamplifier 3 may be incorporated in the power feeding unit of the antenna 1. The terminal structure may be configured as a male (male) or female (female) so that the output terminal of the antenna 1 and the input terminal of the preamplifier 3 can be directly connected. By doing so, it is preferable that the C / N deterioration of the received signal is reduced.

The reception signal amplified to a predetermined level in the preamplifier 3 is connected to the terminal receiver 50 of the present application via the coaxial cable 4. The coaxial cable 4 is preferably a coaxial cable having a bendability of 2C or smaller diameter, for example, and is easy to arrange according to the line of the vehicle body and when the antenna is installed outside the vehicle. The pull-in work inside the car body is easy. The coaxial cable 4 interposed between the preamplifier 3 and the receiving terminal device 50 of the present application may be formed in a predetermined length, or may be connected in advance. Then, it may be configured to be connected with a connector.

Next, the receiving terminal device 50 will be described. The receiving terminal device 50 is installed via a coaxial cable 4 in a car trunk room, under a seat, in a dashboard or the like.
The terminal receiver 50 shown in the embodiment of the present application is provided with three high-frequency amplifier circuits with automatic gain adjustment circuits, respectively, so as to correspond to television signals from three antennas installed in a car. The television signal amplified to a predetermined level in the preamplifier 3 is converted into a combined signal by the mixing means 13 and then amplified to a predetermined level in the amplifier unit 15 with an automatic gain adjustment circuit. Is input to a receiving unit 35 having a channel selection / demodulation means for channel selection / demodulation. The signal demodulated in the receiving unit 35 is connected to a display means such as a liquid crystal television set on a dashboard of a car, for example.

Thus, the television receiving amplifying device 1 or the receiving terminal device 50 of the present application is suitable for receiving terrestrial digital broadcasting, and if these are used, a receiving system system using a dipole antenna 1 having a simple configuration is provided. However, by providing a plurality of these antennas apart from each other and providing a high-frequency amplifier circuit of a system corresponding to the number of antennas installed, it is easy to connect the antenna to each input terminal. Since the composite signal composed of the television signal received by the antenna is generated, it is configured so that the optimum reception can be performed by any of the antennas even if the radio wave condition changes. Also, by configuring as in the embodiment shown in the present application, especially when receiving digital terrestrial broadcasting, the signals from the respective antennas are not switched and received as in the diversity system, so that noise generated at the time of switching, etc. As a result, there is no influence such as freezing of the image, and the circuit configuration is simplified, so that the cost can be reduced.
It is also ideal for use in areas where the transmission power of terrestrial digital broadcast waves, etc. is not currently at full power, or where it is not being output stably, such as when used to receive terrestrial digital broadcasts. TV broadcasting is completely digitized after 2011 in a state where it is installed so as to be in a proper reception state, and multi-channel radio waves are input or transmission power is increased from the current reception state. However, even if a signal with a higher level is input to the amplifying device, an optimum output level can be automatically obtained, so that it is possible to receive a wide dynamic range with respect to changes in the input level.
In addition, when considering use with a moving body such as a car, the electric field strength may change greatly during a short period of movement, as well as the fluctuations in the reception level as described above. Compared to an amplifying device that switches the setting of the attenuator by operating the switch during movement (ie during operation) in order to respond to changes in the input, it does not require switch operation. -ing
Furthermore, since there is no need to perform a switch operation, the installation location of the television receiving amplifying device 1 or the receiving terminal device 50 is not limited, and an extremely convenient television receiving amplifying device and receiving terminal device can be provided. It is.

Note that the present invention is not limited to the above-described embodiment, and the configuration of each part can be appropriately changed and implemented without departing from the spirit of the present invention.

It is a schematic block diagram which shows embodiment of the television receiving amplifier concerning this application. The different Example of the amplifier for television reception concerning this application is shown. It is a schematic block diagram which shows embodiment of the receiving terminal device which concerns on this application. It is a schematic block diagram which shows different embodiment of the receiving terminal device which concerns on this application. It is the schematic which shows a receiving system when the television receiving amplification apparatus or receiving terminal device of this application is attached to the vehicle body.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Antenna, 2 ... Television receiver amplifier, 3 ... Preamplifier, 4 ... Transmission line, 5 ... Input side power supply superimposing means, 6 ... Switch, 12 ... First signal attenuation means, 13 ... Mixing means, 15 DESCRIPTION OF SYMBOLS ... Amplification part, 16 ... 2nd signal attenuation means, 17 ... Output branch means, 17a ... Branch terminal, 18 ... Output side power supply separation means, 19 ... Filter means, 20 ... Automatic gain adjustment means, 25 ... AC plug, 26 DESCRIPTION OF SYMBOLS ... Power supply generation means, 30 ... Terminal side apparatus, 31 ... Power supply superimposition means, 32 ... Power supply generation means, 33 ... AC plug, 35 ... Reception part, 50 ... Terminal reception apparatus, 100 ... Vehicle body

Claims (5)

In a television receiving and amplifying apparatus for amplifying a television signal received by a plurality of antennas for receiving television broadcast waves and drawn from each antenna via a transmission line,
The television reception amplifying device includes at least as many input terminals as the antennas for inputting signals from a plurality of antennas, and the same number of first antennas as the antennas for attenuating the television signals input from the input terminals. Signal attenuating means, mixing means for mixing the output signals attenuated in the respective first signal attenuating means and outputting them as synthesized signals, and second signal attenuating means for attenuating the synthesized signals output from the mixing means, , An amplifying unit for amplifying the combined signal attenuated by the second signal attenuating means, and outputting the combined signal amplified by the amplifying unit to the output terminal and a part of the amplified combined signal And an output branching means for branching the first signal attenuating means based on the combined signal branched by the output branching means so that the combined signal amplified by the amplifying unit has a predetermined level. And automatic gain control means for generating a control voltage for controlling the attenuation amount of the fine said second signal attenuation means, an output terminal,
A television receiver amplifying device comprising:
In a receiving terminal device for a television signal received by a plurality of antennas for receiving television broadcast waves and drawn from each antenna through a transmission line,
The reception terminal device includes at least the same number of input terminals as the antennas for inputting signals from a plurality of antennas, and the same number of first signals as the antennas for attenuating television signals input from the input terminals. Attenuating means, mixing means for mixing the output signals attenuated in the respective first signal attenuating means and outputting them as synthesized signals, second signal attenuating means for attenuating the synthesized signals output from the mixing means, An amplifying unit for amplifying the combined signal attenuated by the second signal attenuating means; and outputting the combined signal amplified by the amplifying unit to the output terminal side and a part of the amplified combined signal And an output branching means for branching the first signal attenuating means and the first signal attenuating means based on the combined signal branched by the output branching means so that the combined signal amplified by the amplifying unit has a predetermined level. An automatic gain adjusting means for generating a control voltage for controlling the attenuation amount of the second signal attenuating means, and a predetermined television signal is selected and demodulated from the synthesized signal output from the output branching means. A receiving unit equipped with a channel selection / demodulation means, an output terminal,
A receiving terminal device comprising:
Between each of the input terminals and each of the first signal attenuating means, a capacitor that passes a television signal received by an antenna and blocks a DC power supply, and a DC power supply connected to a connection point between the input terminal and the capacitor. Power superimposing means comprising a choke coil that passes through and blocks the TV signal, and can supply power via a transmission line to a preamplifier provided in a coaxial cable connecting the antenna for receiving the TV broadcast wave and the input terminal The television receiving device according to claim 1 and the receiving terminal device according to claim 2, wherein the receiving device is configured as described above.
4. The television receiving amplifying device or claim 2 or claim 3, wherein the television receiving amplifying device and the receiving terminal device are configured to receive terrestrial digital broadcasts. Item 4. The receiving terminal device according to Item 3.
In a television reception system including at least a television reception amplifying device or a reception terminal device for television signals received by a plurality of television broadcast wave receiving antennas and drawn from each antenna by a transmission line,
The television receiving amplifying device is configured by using the television receiving amplifying device according to any one of claims 1, 3, or 4, or the receiving terminal device is claim 2, claim 3, or claim 3. A television receiving system comprising the receiving terminal device according to any one of items 4 to 6 above.

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