JPH10178595A - Television receiver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To receive a television ground broadcasting radio wave without newly installing an indoor antenna when there is no antenna terminal around by providing a means which demodulates a television ground broadcasting radio wave signal that is received through the cable of a telephone line. SOLUTION: A plug unit 12 which is connected to a telephone line terminal 11 inputs a telephone signal that is sent through a telephone line to the housing 13 of a television receiver, and also inputs a television ground broadcasting radio wave signal that is received through a telephone line cable. A signal extracting means 15 separates only a television ground broadcasting radio wave signal from the telephone signal and the television ground broadcasting radio wave signal and outputs it to an impedance converting means 16. The means 16 adjusts impedance of a signal system of television ground broadcasting radio waves to fit the input impedance of a television tuner part 17 and outputs a television ground broadcasting radio wave signal to the part 17.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a television receiver, and more particularly to a television receiver capable of receiving terrestrial television broadcasting.

[0002]

2. Description of the Related Art At present, television broadcasting has various radio wave signal transmitting means. For example, cable broadcasting, which performs signal transmission by a cable generally called a cable television, is becoming widespread. However, broadcasts based on wireless transmission are still mainstream. Wireless methods are distinguished from terrestrial broadcasts, satellite broadcasts, and the like by differences in radio transmission means. Currently, terrestrial broadcasting that emits radio waves from a transmitting station installed on the ground and provides broadcasting services to nearby residents is overwhelmingly large.

[0003] In a normal house or building, in order to receive a television terrestrial broadcast wave transmitted from a broadcast station in a VHF frequency band or a UHF frequency band by a television receiver, a radio wave is received by a receiving antenna installed outdoors or the like. And receive
The received radio signal reaches an antenna terminal connected to a receiving antenna and installed on a wall surface of an indoor room or the like. By connecting this antenna terminal to the television receiver with an antenna cable such as a coaxial cable or a feeder wire, the television receiver can receive a terrestrial television broadcast.

[0004]

However, when a television receiver is installed in a place where an antenna terminal is not installed nearby and a television terrestrial broadcast wave is received, an antenna cable must be pulled from a remote antenna terminal. , It is necessary to reach the television receiver. Therefore, the total length of the antenna cable becomes longer,
Problems arise, such as the need to purchase a new one. In addition, depending on the distance between the antenna terminal and the place where the television receiver is to be installed and the structure of the building, it may be necessary to appropriately construct a house or a building to cope with the situation.

In the case where this long antenna cable connection method is not used, an indoor antenna is installed on the side of the television receiver separately from the outdoor antenna and connected by an antenna cable to receive television terrestrial broadcasting. Can respond. However, there is a case where the indoor antenna does not always have sufficient radio wave receiving capability, and there is a possibility that a good image cannot be obtained. As described above, good reception of television terrestrial broadcast waves by a television receiver in a place where an antenna terminal is not installed nearby is often complicated or difficult.

An object of the present invention is to provide a television receiver capable of receiving a terrestrial television broadcast wave when there is no antenna terminal nearby and without installing a new indoor antenna or the like. It is to provide.

[0007]

According to a first aspect of the present invention, there is provided a television receiver having a data line termination device connected to a telephone line. A telephone line cable to be connected is used as a receiving antenna, and demodulation means for demodulating a television terrestrial broadcasting radio signal received by the receiving antenna is provided.

[0008] A television receiver according to claim 2 is
In a television receiver having a data line terminating device connected to a telephone line, a demodulation means for demodulating a television terrestrial broadcast radio signal received by a telephone line cable connected to the data line terminating device is provided.

According to a third aspect of the present invention, there is provided a television receiver,
The television receiver according to claim 1 or 2, further comprising a cable for transmitting a television terrestrial broadcast radio signal received by a telephone line cable to the demodulation means.

[0010] The television receiver according to claim 4 is
4. The television receiver according to claim 1, wherein the demodulation unit extracts a received radio wave signal, and outputs the extracted television terrestrial broadcast radio wave signal to a television tuner unit. And impedance conversion means for transmitting to

A television receiver according to claim 5 is
The television receiver according to any one of claims 1 to 4, wherein the impedance conversion unit has a structure detachable from the television tuner unit.

A television receiver according to claim 6 is
6. The television receiver according to claim 1, wherein a television terrestrial broadcasting radio signal received by a telephone line cable and a television terrestrial broadcasting radio signal received by a receiving antenna are selectively switched. And means for outputting to the TV tuner unit.

A television receiver according to claim 7 is
The television receiver according to any one of claims 1 to 6, further comprising means for amplifying the television terrestrial broadcast radio signal output by the impedance conversion means.

A television receiver according to claim 8 is
The television receiver according to any one of claims 1 to 7, wherein the impedance conversion unit is configured to determine an impedance of the television terrestrial broadcast radio signal received by the telephone line cable and an input impedance of the television tuner unit. It is characterized in that the value of the impedance signal can be adjusted so as to be matched.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Television terrestrial broadcast waves are received by a telephone line cable without using a receiving antenna installed outdoors or the like. That is, the telephone line cable has radio wave receiving capability, and can be a substitute for the receiving antenna. The present inventors have arrived at the present invention based on this fact.

In a television receiver having a data line terminator such as a modem (modem) according to the present invention,
A means for demodulating a television terrestrial broadcast radio signal received by a telephone line cable; The means for demodulating the television terrestrial broadcast radio signal includes at least signal extraction means for extracting the radio signal and impedance conversion means for transmitting the extracted television terrestrial broadcast radio signal to the television tuner unit.

A television terrestrial broadcast radio signal received by a telephone line cable is transmitted to a modem (modem) according to the present invention.
And the like via a transmission line to a television receiver having a data line terminating device. This data line terminator
Originally, it is built-in for transmitting and receiving information signals (such as voice) via a telephone line. Therefore, it may be necessary to simultaneously receive television terrestrial broadcast radio waves via a telephone line cable and transmit and receive information signals via a telephone line, and each process signal must be transmitted and received independently. However, transmission and reception of the information signal and the television terrestrial broadcast wave signal via the telephone line are performed without affecting each signal. Thereafter, only the television terrestrial broadcast radio signal is extracted, subjected to impedance conversion, and further amplified as necessary, so that the broadcast is received in the same manner as a television terrestrial broadcast received by a normal receiving antenna.

When an antenna terminal for transmitting television terrestrial broadcast waves to a television receiver is not installed in the vicinity, there is a modular outlet which is a terminal for connecting a telephone line in the vicinity of the television receiver. For example, by connecting a modular outlet and a data line terminating device such as a modem incorporated in the television receiver of the present invention by a transmission line, it is possible to obtain a television terrestrial broadcast radio signal received by a telephone line cable. it can.

The telephone line terminals are installed in many places, especially in a building, compared to the antenna terminals, and the installation density is much higher. Therefore, the range of the installation places is less limited, and the television receiver is used. It's easy when you need to move. Also, even in a room where there is no antenna terminal nearby and it is difficult to receive television terrestrial broadcasting with an antenna cable in a normal house, if a telephone line terminal is installed nearby, purchase a new antenna cable for extension It is possible to receive television terrestrial broadcast radio waves without performing. Further, since the antenna cable and the telephone line cable can be unified, it can help to prevent the device wiring from becoming complicated on the rear surface of the housing of the television receiver.

The television receiver according to the present invention can be used for interactive television receivers, videophones, computer displays, etc., which are expected to spread in the future and have a communication function of transmitting and receiving telephone signals via telephone lines. It is possible to add a television terrestrial broadcast reception function using a line cable and apply it.

[0021]

【Example】

(Embodiment 1) An embodiment of the present invention will be described below with reference to the drawings. The arrows in the figure indicate the flow of signals, and in particular, the flow of signals in the main parts constituting the television receiver of the present invention is described. FIG. 1 is a block diagram showing a configuration according to an embodiment of the present invention. A plug unit 12 connected to a telephone line terminal (modular outlet) 11 inputs a normal telephone signal transmitted by a telephone line to a casing 13 of the television receiver and receives the signal by a telephone line cable. A television terrestrial broadcast radio signal is also input. The plug unit 12 is connected to a data line terminating device 14 such as a modem.

The signal extracting means 15 includes a plug unit 12
From the input telephone signal and television terrestrial broadcasting radio signal, only the television terrestrial broadcasting radio signal is separated and output to the impedance conversion means 16. The telephone signal is sent to the data line terminating device 14. The signal extracting means 15 has a high-pass filter or the like by a capacitor so as to prevent erroneous transmission of a telephone line signal from the housing 13 of the television receiver to the impedance converting means 16 and to prevent signal confusion. ing.

The impedance conversion means 16 matches the impedance of the signal system of the television terrestrial broadcast wave from the telephone line to the impedance conversion means 13 so as to match the input impedance of the TV tuner section 17. Outputs the radio signal of television terrestrial broadcasting. This matching is a rough matching because the impedance differs individually depending on the length and thickness of the telephone line cable for receiving the television broadcast wave. The impedance conversion means 16 is detachable by a TV tuner 17 and connection plugs 18a and 18b. Thereby, when the television receiver is installed near the antenna terminal, the impedance conversion unit 16 is separated from the TV tuner unit 17 as necessary, and the antenna terminal ( (Not shown) and the television tuner unit 17 are connected by an antenna cable via a connection plug 18b, so that a television terrestrial broadcast wave can be received. The structure and configuration of the impedance conversion means 16 are the same as those of a 300Ω-75Ω converter provided in a general television receiver.

The television tuner section 17 converts the radio wave of the television terrestrial broadcast input from the impedance conversion means 16 into the radio wave of the channel selected by the television receiver into an IF (intermediate frequency), and converts the signal into an IF signal processing section 19. Output to According to the above configuration, the television receiver of the present invention can receive the signal. Even when there is no antenna terminal nearby, the television terrestrial broadcast radio signal received by the telephone line cable can be extracted and received from the telephone line cable.

(Embodiment 2) FIG. 2 is a block diagram showing the configuration of another embodiment of the present invention. The basic configuration and the operation of each means are substantially the same as those of the first embodiment shown in FIG. In this embodiment, an RF amplifier 20 is provided between the TV tuner 17 and the impedance converter 16. The impedance conversion means 16 once matches the impedance of the signal system of the television terrestrial broadcast wave from the telephone line to the impedance conversion means 16 so as to match the input impedance of the RF amplification means 20, and inputs the signal from the signal extraction means 15. The signal of the television terrestrial broadcast wave is output to the RF amplifier 20. This matching is a rough matching because the impedance differs individually depending on the length and thickness of the telephone line cable for receiving the television broadcast wave.

The RF amplifier 20 amplifies the radio wave input from the impedance converter 16 and outputs the amplified radio wave to the antenna plug unit 21. Antenna plug unit 21
Transmits the radio wave from the RF amplifying means 16 to the TV tuner 1
7 and a TV tuner 17 and a connection plug 18a as in the first embodiment shown in FIG.
And 18b. By providing the RF amplifying means 20, even if the radio signal from the telephone line is a weak radio signal as compared with the case where the radio signal is received by a normal receiving antenna, the S / N can be improved, and a better television John is able to receive terrestrial broadcasts.

(Embodiment 3) FIG. 3 is a block diagram showing a configuration according to still another embodiment of the present invention. The basic configuration and the operation of each means are substantially the same as those of the first embodiment shown in FIG. In this embodiment, the impedance conversion means 16 converts the impedance of a signal system from the telephone line to the impedance conversion means 16 into a television tuner section 17.
After being matched so as to conform to the input impedance, the radio wave input from the signal extracting means 15 is output to the RF switching means 22. This matching is a rough matching because the impedance differs individually depending on the length and thickness of the telephone line cable for receiving the television broadcast wave.

The RF switching means 18 switches between a television terrestrial broadcast radio wave from an antenna cable connected to a receiving antenna and a television terrestrial broadcast radio wave from the impedance conversion means 16 and outputs to the television tuner unit 17. This switching means switches mechanically or electrically. There is a case where a telephone line cable is not connected because data communication via a telephone line is not performed and the data line terminating device 14 is not used, or a case where a signal is received by a normal receiving antenna is better. In this case, an antenna cable is connected to the RF conversion means 22, and a television terrestrial broadcast radio signal received by the receiving antenna is input as necessary. The television terrestrial broadcast radio signal received by the receiving antenna or the telephone line cable is switched by a mechanical or electrical switch to select a means for obtaining a good radio signal, and the television tuner 1
7 can be output.

(Embodiment 4) FIG. 4 is a block diagram showing the configuration of still another embodiment of the present invention. The basic structure and the operation of each means are almost the same as those of the third embodiment shown in FIG. In this embodiment, the RF switching means 2
Between the RF amplifier 2 and the impedance converter 16
0 is provided. The impedance conversion means 16
The impedance of the signal system from the telephone line to the impedance conversion means 16 is matched to match the input impedance of the RF amplification means 20, and the radio wave input from the signal extraction means 15 is output to the RF amplification means 20. This matching is a rough matching because the impedance differs individually depending on the length and thickness of the telephone line cable for receiving the television broadcast wave.

The RF amplifier 20 amplifies the radio wave from the impedance converter 16 and outputs the amplified radio wave to the RF switch 22. As a result, the S / N can be improved even with radio waves from a telephone line weaker than when receiving with a normal receiving antenna, and better television terrestrial broadcasting can be received. The RF switching unit 22 switches between a television terrestrial broadcast wave from an antenna cable connected to a receiving antenna and a television terrestrial broadcast wave from the RF amplifying unit 20 and outputs it to the TV tuner unit 17. This switching means switches mechanically or electrically.

(Embodiment 5) FIG. 5 is a circuit diagram of the impedance conversion means 16. In the first to fourth embodiments, the matching by the impedance conversion means 16 is a rough matching because the impedance of the telephone line differs individually. If this matching is performed accurately, terrestrial broadcast waves can be output to the TV tuner more strongly, and interference by radio waves other than for the purpose of reception can be reduced. Therefore, the inductance of the secondary impedance matching coil 24 in the impedance conversion means 16 or the capacitance of the secondary impedance matching capacitor 25 can be adjusted. By adjusting the inductance of the secondary-side impedance matching coil 24 or the secondary-side impedance matching capacitor 25 in the impedance conversion means 16 so that the user can accurately perform impedance matching, television terrestrial broadcasting can be performed. Good reception of radio waves.

[0032]

Since the present invention is configured as described above, it has the following excellent effects.
The television receiver of the present invention has a data line terminating device such as a modem, and a telephone line cable from a telephone line terminal is connected to a plug unit. Television terrestrial broadcast radio waves received via a telephone line cable can be received from a plug unit after extracting the radio signal. Therefore, even if there is no antenna terminal nearby and it is difficult to receive television terrestrial broadcast waves by connecting an antenna cable, without installing a long antenna cable from a remote antenna terminal or arranging an indoor antenna, Television terrestrial broadcasting can be received.
If the antenna terminal is not in the vicinity and a telephone line terminal is present, the television receiver which has been fixedly used can be easily moved to receive the broadcast.

[Brief description of the drawings]

FIG. 1 is a configuration block diagram showing a first embodiment of the present invention.

FIG. 2 is a configuration block diagram showing a second embodiment of the present invention.

FIG. 3 is a configuration block diagram showing a third embodiment of the present invention.

FIG. 4 is a configuration block diagram showing a fourth embodiment of the present invention.

FIG. 5 is a circuit diagram showing a fifth embodiment of the present invention, and is a diagram showing a circuit of the impedance conversion means 16;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Telephone line terminal 12 Plug unit 13 Case of television receiver 14 Data line terminator 15 Signal extraction means 16 Impedance conversion means 17 TV tuner part 18a, 18b Connection plug 19 IF signal processing part 20 RF amplification means 21 Antenna plug unit Reference Signs List 22 RF switching means 23 Primary impedance matching coil 24 Secondary impedance matching coil 25 Secondary impedance matching capacitor

Claims (8)

[Claims] 1. A television receiver having a data line terminator connected to a telephone line, wherein a telephone line cable connected to the data line terminator is used as a receiving antenna,
A television receiver comprising demodulating means for demodulating a television terrestrial broadcast radio signal received by a receiving antenna. 2. A television receiver having a data line terminator connected to a telephone line, comprising a demodulator for demodulating a television terrestrial broadcast radio signal received by a telephone line cable connected to the data line terminator. A television receiver characterized by the above-mentioned. 3. The television receiver according to claim 1, further comprising a cable for transmitting a television terrestrial broadcast radio signal received by the telephone line cable to the demodulation means. 4. The demodulation means comprises signal extraction means for extracting a received radio signal, and impedance conversion means for transmitting the extracted television terrestrial broadcast radio signal to a television tuner. 3. The television receiver according to any one of 3. 5. The system according to claim 1, wherein said impedance conversion means has a structure detachable from a television tuner.
The television receiver according to any one of the above. 6. A means for selectively switching between a television terrestrial broadcast radio signal received by the telephone line cable and a television terrestrial broadcast radio signal received by a receiving antenna and outputting the signal to a television tuner unit. The television receiver according to claim 1. 7. The television receiver according to claim 1, further comprising means for amplifying a television terrestrial broadcast radio signal output by said impedance conversion means. 8. The impedance conversion means can adjust the value of an impedance signal so that the impedance of a television terrestrial broadcast radio signal received by a telephone line cable matches the input impedance of a television tuner. The television receiver according to any one of claims 1 to 7.