JP2011199768A - Diagnosic system for joint receiving system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To quickly diagnose whether or not a joint reception system needs to be improved when a new joint reception signal is transmitted to the joint reception system.
A portable transmitter transmits a test signal of a known level in the same frequency band as a joint reception signal to be newly transmitted in a joint reception system 2 having an input terminal 6 and a plurality of terminal terminals 10a to 10d. 20 supplies the joint reception system 2 from the input terminal 6. The portable receiver 22 connected to the plurality of terminal terminals 10a to 10d receives the test signal transmitted through the joint reception system 2, and the transmission loss at the terminal terminals 10a to 10d based on the level of the received test signal. Is identified and displayed.
[Selection] Figure 1

Description

  The present invention relates to an apparatus for diagnosing whether or not a joint reception system used in a home or an apartment house has a wide band, and more particularly to a diagnosis system for diagnosing based on transmission loss.

  Conventionally, there is an optical joint reception facility as disclosed in Patent Document 1. In this optical joint reception facility, an optical fiber connects the transmitter station with the optical transmitter and the optical receiver installed at the subscriber's home, and connects the optical receiver and multiple receivers at the subscriber's home with electrical cables. It is.

Japanese Patent Laid-Open No. 10-191298 Japanese Patent Laid-Open No. 2005-207798

  Such an optical joint reception facility may be used in place of a joint reception facility using an electric cable that has been used until now. In this new optical joint reception facility, a joint reception signal that has not been transmitted may be newly transmitted. For example, a satellite broadcast intermediate frequency signal or a satellite communication intermediate frequency signal may be newly transmitted, and the joint reception facility may be broadened. Corresponding to this wide band, whether the joint reception system for transmitting the joint reception signal to a plurality of receivers in the subscriber's home has already been widened, or is a renovation work necessary to widen the band? It was necessary to investigate. For example, Patent Document 2 discloses a technique for diagnosing whether or not the optical transmission path can be widened. However, it is not possible to diagnose whether or not it is possible to widen the band in a joint reception system such as a home using an electric cable. It was.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a diagnostic system for diagnosing whether or not a broadband has been performed in a community reception system using an electric cable.

  Each of the diagnostic systems for a joint reception system according to one embodiment of the present invention includes a portable transmitter and a receiver. These are used in a joint reception system having an input terminal and a plurality of terminal terminals. This joint reception system uses an electric cable, for example, a coaxial cable. The transmitter can supply a test signal of a known level in the same frequency band as the joint reception signal to be newly transmitted in the joint reception system from the input terminal to the joint reception system. As the joint reception signal to be newly transmitted, for example, a joint reception system is newly connected to the optical joint reception facility and has a frequency different from that of the joint reception signal transmitted so far. Specifically, it corresponds to satellite broadcast intermediate frequency signals and satellite communication intermediate frequency signals in the GHz band that have not been transmitted so far. As the test signal, for example, an unmodulated signal can be used, and in order to set the level to a known level, the transmitter can be provided with an automatic gain control means, for example. As a test signal, when there are a plurality of joint reception signals to be newly transmitted, it is possible to use a plurality of signals having different frequencies corresponding to the signals, or a plurality of joint reception signals to be newly transmitted. Of these, one having a specific frequency, for example, the highest frequency can be used. The receiver is configured to be connectable to each of the plurality of terminal terminals. The receiver receives the test signal transmitted through the joint reception system, connected to each terminal terminal, and identifies and displays the transmission loss at each terminal terminal based on the level of the received test signal. . The transmission loss can be identified by detecting the level of the test signal by the level detecting means and comparing the detected level with a predetermined reference signal by the comparing means. Alternatively, it comprises a gain adjustment means, a control means for controlling the gain adjustment means, and a level detection means for detecting the level of the received test signal and supplying the level detection signal to the control means. The level detection signal is supplied to the control means, and the control means supplies the gain control signal to the gain adjustment means so that the level at the gain adjustment means becomes a predetermined value. The gain control signal is determined in advance. The reference signal may be compared with the reference means. The display can be one type of display indicating that there is a transmission loss of one or more values determined in advance, or at least two different values of transmission loss are defined and divided by these two transmission losses. It is also possible to display which section of the plurality of sections corresponds to the transmission loss. The display can be performed by changing the display means to a display state different from the conventional one, or can be displayed using characters, figures, or both.

  In the diagnostic system for a joint reception system configured as described above, a transmitter is connected to the input terminal of the joint reception system, a receiver is sequentially connected to each terminal terminal of the joint reception system, and a test signal is received at each terminal terminal. To do. When the reception level is detected, since the level of the test signal is known, the transmission loss in the joint reception system is found on the receiver side. Thereby, it is possible to diagnose whether or not the joint reception signal to be newly transmitted can be transmitted without modification of the joint reception system.

  The receiver may include a battery and operation means. In this case, a DC signal from the battery can be transmitted from the terminal terminals to the joint reception system by the operation of the operation means. For example, direct current is supplied from each terminal. The transmitter changes the level of the test signal when receiving the DC signal from the input terminal. For example, the supply of the test signal from the input terminal is stopped, or the level of the test signal is made smaller or larger than before.

  With this configuration, when a DC signal is transmitted from the terminal terminal side to the input terminal side, the level of the test signal from the transmitter side changes. It changes with things. By changing the display in this way, it has been found that a DC signal can be transmitted from the terminal terminal to which the receiver is connected to the input terminal side. For example, an operation power supply device for a device connected to the input terminal is provided. It turns out that it is possible to connect to the terminal terminal to which the receiver is connected. On the other hand, if the display does not change even if the operating means is operated with the receiver connected to any terminal terminal, it is currently impossible to transmit a DC signal from any terminal terminal to the input terminal side. It turns out that, for example, renovation work is necessary.

  As described above, according to the present invention, when a new joint reception signal is transmitted to the joint reception system, it is possible to quickly know whether or not the joint reception system needs to be modified.

It is a block diagram of a transmitter and a receiver of the diagnostic system for a joint reception system according to the first embodiment of the present invention. It is a perspective view of the transmitter and receiver of FIG. It is a block diagram of the state which connected the transmitter and receiver of FIG. 1 to the joint reception system which is going to diagnose. It is a block diagram of a transmitter and a receiver of a diagnostic system for a joint reception system according to a second embodiment of the present invention.

  The diagnostic system for a joint reception system according to the first embodiment of the present invention is widened by measuring the transmission loss of the joint reception systems 2 and 4 as shown in FIGS. 3 (a) and 3 (b), for example. Diagnose whether it is a thing or not.

  The joint reception system 2 of FIG. 3A is used in, for example, a detached house, and has an input terminal 6, and this input terminal 6 is distributed through an electric cable, for example, a coaxial cable, for example, 4 distribution units. Connected to the device 8. Each distribution terminal of the four distributor 8 is connected to four terminal terminals 10a, 10b, 10c, and 10d provided in each room of the house via a coaxial cable. Depending on the structure of the house, another number of distributors are used instead of the four distributors, and the number of terminal terminals changes accordingly.

  The joint reception system 4 in FIG. 3B is used in, for example, one apartment house, and has an input terminal 12, and this input terminal 12 is connected to the input side of one branching device 14a via a coaxial cable. It is connected. The branch side of the 1 branching device 14a is connected to a terminal terminal 16a provided in a predetermined room of one house of the apartment house through a coaxial cable. The output side of the 1 branching device 14a is connected to the 1 branching device 14b through a coaxial cable. The branch side of the 1 branching device 14b is connected to a terminal terminal 16b provided in a predetermined room of another house of the apartment house through a coaxial cable. Hereinafter, similarly, the 1 branching devices 14c and 14d and the terminal terminals 16c and 16d are connected. Also in this joint reception system 4, the number of 1 branching devices and terminal terminals increases / decreases according to the number of housings of an apartment house.

  In the joint reception systems 2 and 4, for example, a television broadcast reception signal directly received by an antenna or a joint reception signal is supplied from a joint reception facility using a coaxial cable, but has been transmitted through the optical joint reception facility. The optical co-received signal is converted into an electric co-received signal by the opto-electric conversion device and supplied. Up to now, for example, joint reception systems 2 and 4 have transmitted joint reception signals of frequencies up to the UHF band and television reception signals of the UHF band. In addition to this, signals of frequencies in the GHz band, for example, satellite broadcasting intermediates Frequency signals and satellite communication intermediate frequency signals are also transmitted. Therefore, whether the equipment used in the joint reception system 2 or 4, for example, the coaxial cable, the distributor 10, or the branching devices 14 a to 14 d can transmit satellite broadcast intermediate frequency signals and satellite communication intermediate frequency signals. For diagnosis, a diagnostic system for the joint reception system is used.

  This joint reception system diagnostic system includes a transmitter 20 and a receiver 22. The transmitter 20 and the receiver 22 are portable as shown in FIG. 2, and are configured in a small transmitter case 24 and a receiver case 26, respectively.

  The transmitter 20 has an oscillating unit 28 as shown in FIG. The oscillating unit 28 oscillates a test signal in a frequency band near the center frequency of a satellite broadcast intermediate frequency signal or satellite communication intermediate frequency signal newly introduced in the joint reception system 2 or 4 but having a high frequency. The oscillation frequency can be fixed, or the oscillation frequency can be made variable so that test signals in the frequency band near the center frequency of the satellite broadcast intermediate frequency signal and the satellite communication intermediate frequency signal can be oscillated. For example, the oscillation frequency variable instruction is supplied from the control circuit 30 to the oscillation unit 28. An instruction to start oscillation is also given from the control circuit 30. The control circuit 30 gives an oscillation start instruction to the oscillation unit 28 by operating a test signal oscillation start instruction switch (not shown).

  The test signal from the oscillator 28 is supplied to the gain adjuster 32 of the attenuator, for example. The output signal of the gain adjusting unit 32 is amplified by an amplifying unit, for example, an amplifying unit 34. The amplified output is supplied to the output terminal 40 via the one branching device 36 and the DC blocking capacitor 38. The branch output of the one branching device 36 is supplied to the signal detecting unit 42, where the level of the amplified output of the amplifying unit 34 is detected. The level detection signal from the signal detection unit 42 is supplied to the gain adjustment unit 32. The gain adjustment unit 32 adjusts and outputs the test signal from the oscillation unit 28 so that the level of the test signal supplied to the amplification unit 34 is constant. Thus, the transmitter 20 has automatic gain control of the test signal. The signal detector 42 is configured so that the level of the test signal output from the output terminal 40 is predetermined. The oscillating unit 28, the control circuit 30, the gain adjusting unit 32, the amplifying unit 34, and the signal detecting unit 42 of the transmitter 20 are housed in the transmitter case 24, and from a battery 44 that is also disposed in the transmitter case 24. Operates with supplied DC power.

  The transmitter 20 has its output terminal 40 connected to the input terminal 6 or 12 of the joint reception system 2 or 4 as shown in FIGS. 3 (a) and 3 (b), and the test signal is sent to the joint reception system 2 or 4. Supply.

  The receiver 22 has an input terminal 44 as shown in FIG. The input terminal 46 is sequentially connected to the terminal terminals 10a to 10d or 16a to 16d of the joint reception system 2 or 4, and receives a test signal transmitted through the joint reception system 2 or 4.

  In the receiver 22, the test signal from the input terminal 46 is supplied to the amplifying means, for example, the amplifying unit 50 via the DC blocking capacitor 48. The test signal amplified in the amplification unit 50 is supplied to the signal detection unit 52.

  The signal detection unit 52 includes a level detection unit (not shown) that detects the level of the test signal from the amplification unit 50. The level detection signal from the level detection unit is divided into a plurality of, for example, four different reference signals. Each is compared by a comparator (not shown). As for these reference signals, the test signals supplied to the input terminals 6 and 12 of the joint reception systems 2 and 4 are transmitted to the joint reception systems 2 and 4, and either one of the terminal terminals 10a to 10d or the terminal terminals 16a to 16d. When received at either level, the level detection signal of the level detection unit 54 is transmitted at 30 dB, 20 dB, 10 dB, and 0 dB from the original test signal (the output level of the test signal transmitted from the transmitter 20). It is set to a level equivalent to receiving a loss. Display is made on the display unit 54 based on the comparison results of these comparators.

  For example, as shown in FIG. 2, the display unit 54 includes four display means, for example, LEDs 54a to 54d. The LED 54a corresponds to a transmission loss of 30 dB or more. When a transmission loss of 30 dB or more occurs in the joint reception system 2 or 4, the LED 54a changes the display state with the other LEDs 54b to 54d, for example, only the LED 54a is lit. . The LED 54b corresponds to a transmission loss of 20 dB or more and less than 30 dB. When a transmission loss of 20 dB or more and less than 30 dB occurs, only the LED 54b is lit. The LED 54c corresponds to a transmission loss of 10 dB or more and less than 20 dB, and when the transmission loss of 10 dB or more and less than 20 dB occurs, only the LED 54c is lit. The LED 54d corresponds to a transmission loss of 0 dB or more and less than 10 dB, and when a transmission loss of 0 dB or more and less than 10 dB occurs, the comparison result of each comparator is processed in the signal detection unit 52 so that only the LED 54d is lit. ing.

  Therefore, it is possible to easily diagnose whether or not the joint reception system 2 or 4 needs to be modified depending on which of the LEDs 54a to 54d is lit. For example, when the LED 54a is lit at any of the terminal terminals 10a to 10d or 16a to 16d, the joint reception system 2 or 4 can be assumed to transmit a signal with a significant attenuation in the GHz band, and the bandwidth is increased. Therefore, it can be diagnosed that a major renovation with replacement of a coaxial cable, a distributor, or a branching unit is necessary. When the LED 54d is lit, the joint reception system 2 or 4 can be assumed to be able to transmit a signal in the GHz band without being greatly attenuated, and it can be diagnosed that no modification is necessary. When the LED 54b or 54c is lit, it is not necessary to modify the joint reception system 2 or 4 itself as a modification. For example, a booster may be installed between the input terminal 6 or 12 and the photoelectric conversion device. It can be assumed that the renovation is minor.

  The amplification unit 50, the signal detection unit 52, and the display unit 54 of the receiver 22 are installed in the receiver case 26, and these are operated by DC power from a battery 56 installed in the receiver case 26.

  Since the transmitter 20 and the receiver 22 are housed in a small transmitter case 24 and a receiver case 26, respectively, the transmitter 20 and the receiver 22 are easy to carry and need to be modified in a home joint reception system in different places. This is useful for determining whether or not there is.

  A diagnostic system for a joint reception system according to a second embodiment of the present invention is shown in FIG. In the joint reception system 2 or 4, this joint reception system diagnostic system determines whether or not a direct current can be transmitted from any of the terminal terminals 10 a to 10 d or 16 a to 16 d to the input terminal 6 or 12. The terminal terminals 10a to 10d or 16a to 16d can be determined. For example, an opto-electric conversion device is installed in the vicinity of the input terminal 6 or 12 of the joint reception system 2 or 4, but if the operating power for this can be transmitted from any terminal terminal, the supply of the operating power is related. If no modification is necessary and transmission is not possible, for example, the distributor 8 of the joint reception system 2 and the one branching devices 14a to 14d of the joint reception system 4 are repaired to the energized type or operate near the input terminal 6 or 12. It is necessary to install a power supply. The diagnosis system for the joint reception system according to the second embodiment enables the terminal terminal side to diagnose whether such modification or installation is necessary.

  In the receiver 22 a, operating means, for example, an open / close switch 58 and a high frequency blocking coil 60 are connected between the battery 56 and the input terminal 46. The open / close switch 58 is open in the non-operating state and is closed in the operating state. Since the other configuration of the receiver 22a is the same as that of the receiver 22, the same parts are denoted by the same reference numerals and description thereof is omitted.

  In the transmitter 20a, a test signal level changing means, for example, an open / close switch 62 is connected to the output terminal 40 via a high frequency blocking coil 60. The open / close switch 62 can switch the operating power from the battery 44 to the control circuit 30. When DC current is not supplied to the open / close switch 62, the open / close switch 62 supplies operating power from the battery 44 to the control circuit 30, and the control circuit 30 operates normally. As a result, a test signal is output from the oscillation unit 28. Is output. When a direct current is supplied to the open / close switch 62, the open / close switch 62 does not supply operating power from the battery 44 to the control circuit 30 for a predetermined time. As a result, the control circuit 30 stops operating, and no test signal is output from the oscillation unit 28. Since the other configuration of the transmitter 20a is the same as the configuration of the transmitter 20, the same parts are denoted by the same reference numerals and description thereof is omitted.

  Since the transmitter 20a is configured in this way, the transmitter 20a is connected to the input terminal 6 or 12 of the joint reception system 2 or 4, and the receiver 22a is connected to the terminal terminals 10a to 10d of the joint reception system 2 or 4. After connecting to 16a to 16d in order and measuring the transmission loss as in the first embodiment, the switch 58 is operated in the receiver 22a. In the joint reception system 2 or 4, if a DC signal, for example, a DC current, can be transmitted from the terminal terminal to which the receiver 22a is connected to the input terminal 6 or 12, the output terminal 40 of the transmitter 20a and the high frequency blocking coil 60 are connected. Thus, a direct current flows through the switch 62, and the switch 62 stops supplying current from the battery 44 to the control circuit 30. As a result, the oscillation unit 28 stops operating.

  As a result, the receiver 22a cannot receive the test signal that has been received so far, and the display unit 54 lights up the LED 54a indicating that the transmission loss is greatest. If any of the LEDs 54b to 54d other than the LED 54a is lit before operating the switch 58, the LED 54a is changed to lit, so that the terminal 22 to which the receiver 22a is connected in the reception system 2 or 4 is changed. A direct current can be transmitted to the input terminal 6 or 12, and it can be diagnosed that the joint reception system 2 or 4 is not required to be modified. If the LED 54a does not change to lighting even when the switch 58 is operated while the LEDs other than the LED 54a are lit, a direct current is transmitted from the receiver 22a to the transmitter 20a via the joint reception system 2 or 4. It can be diagnosed that the DC current cannot be transmitted to the input terminal 6 or 12 from the terminal terminal to which the receiver 22a is connected in the reception system 2 or 4, and that the joint reception system 2 or 4 needs to be improved.

  In both the above embodiments, the signal detection unit 52 of the receivers 22 and 22a is configured to detect the output level of the amplification unit 52 and compare the level with a different reference signal. An automatic gain control circuit may be provided, and an automatic gain control signal for automatic gain control in the automatic gain control circuit may be compared with a reference signal having a different value. In both of the above embodiments, the display unit 54 of the receivers 22 and 22a is configured to display transmission loss in four stages. However, using one or more reference signals, two or more arbitrary stages are used. The transmission loss can be displayed at this stage. Moreover, although LED54a thru | or 54d was used as the display part 54, it can replace with these and can also use one liquid crystal display part which can display a character and a figure, for example. In this case, the transmission loss of 30 dB or more, the transmission loss of 30 to 20 dB, the transmission loss of 20 to 10 dB, the transmission loss of 10 to 0 dB can be displayed in the same manner as in the first embodiment, and the repair is necessary. Characters that do not require modification can also be displayed. In both the above embodiments, among the LEDs 54a to 54d, only the LED corresponding to the transmission loss range corresponding to the identified transmission loss is lit, but conversely, the identified transmission loss falls within the corresponding transmission loss range. Only the corresponding LED can be turned off, and the other LEDs can be turned on. In both the above embodiments, the cases of diagnosing the joint reception systems 2 and 4 have been described. However, the present invention is not limited to these, and joint reception systems having other configurations can also be diagnosed. For example, a two-way joint reception system can be diagnosed.

  In the second embodiment, when the direct current is supplied, the switch 62 is opened to stop the control circuit and the oscillation from the oscillation unit 28 is stopped. For example, it is detected that the direct current is supplied. As a result, the control signal can be supplied from the control circuit 30 to the gain adjusting unit 32 to reduce the level of the test signal output from the gain control unit 32.

2 4 Joint reception system 20 20a Transmitter 22 22a Receiver

Claims (3)

A portable transmission capable of supplying a known test signal from the input terminal to the joint reception system in the same frequency band as the joint reception signal to be newly transmitted in the joint reception system having an input terminal and a plurality of terminal terminals. Machine,
Each of the plurality of terminal terminals is configured to be connectable, receives the test signal transmitted through the joint reception system, identifies transmission loss at each terminal terminal based on the level of the received test signal, and displays A portable receiver that
A diagnostic system for a joint reception system.   2. The diagnostic system for a joint reception system according to claim 1, wherein the receiver includes a battery and an operation unit, and the home joint reception system is connected to the home joint reception system from each terminal by the operation of the operation unit. A diagnostic system for a joint reception system that changes the level of the test signal when the transmitter receives the DC signal from the input terminal.   3. The joint reception system according to claim 1, wherein the receiver includes a plurality of display means, and each display means corresponds to a different transmission loss range, and the transmission loss corresponds to the transmission loss. The diagnostic system for a joint reception system, wherein the display unit corresponding to the range is different in display state from other display units.

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