JP3732819B2 - TV signal booster - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a TV signal booster that can identify where a cable connected to a device having a distribution function is wired on a distribution device side, for example, in a TV joint viewing facility installed in an apartment house.
[0002]
[Prior art]
In a television joint viewing facility in an apartment house or the like, a television signal received by a common receiving antenna or a signal sent from a CATV system headend device via a cable is distributed to each room by a distributor. In this case, the attenuation amount of the television signal differs depending on the distribution condition such as which floor each room to which the television signal is distributed is located, and where the room is located on the same floor. For this reason, if the television signal is simply distributed evenly by the distributor, the level of the television signal distributed to each room becomes different, and the quality of the television reception image in each room cannot be made constant.
[0003]
In order to solve such a problem, conventionally, when designing a distributor, the signal level of each distribution terminal is set in accordance with the distribution condition of each room. For this reason, when connecting a distribution cable to the distribution terminal of the distributor, it is necessary to set the mutual positional relationship correctly.
[0004]
For this reason, conventionally, an operator is arranged in both the distributor and each room, and the distribution cable is identified while communicating with each other, and a predetermined distribution cable is connected to each distribution terminal of the distributor. .
[0005]
[Problems to be solved by the invention]
However, in the above-described conventional method, it is necessary to identify the distribution cable while arranging workers in both the distributor and each room and communicating with each other. There is a problem that it takes time.
[0006]
The present invention has been made to solve the above problems, and an object of the present invention is to provide a cable discriminator that can easily identify a plurality of distribution cables on the device side having a distribution function.
[0007]
Another object of the present invention is to provide a joint receiving device with an identification function and an adapter with an identification function, which are connected to the tip of a distribution cable and have a function of outputting identification data.
[0008]
[Means for Solving the Problems]
According to a first aspect of the present invention, there is provided a television signal booster for a television joint viewing facility, wherein a signal terminal of a television signal input terminal and an internal circuit are connected by a capacitor, and a resistance value is 1 k ohm or more and 100 k ohm or less. Is connected between the signal terminal and the ground, the resistance value is set to a unique value within the range of the resistance value for each booster, and the booster is connected from an external device by the resistance value of the identification resistor of the TV signal input terminal. It can be identified.
According to a second aspect of the present invention, there is provided a television signal booster for a television joint viewing facility, wherein a signal terminal of a television signal input terminal and an internal circuit are connected by a capacitor, and an ID chip storing identification information is grounded to the signal terminal. The identification information for booster identification memorize | stored in the said ID chip can be read from the said television signal input terminal with an external apparatus by connecting in between.
[0009]
With the above configuration, for example, in a TV joint viewing facility installed in an apartment house, a plurality of distribution cables can be easily and reliably identified on the device side having the distribution function, and distribution of the device having the distribution function is possible. A predetermined distribution cable can be correctly connected to the terminal, and the connection work between the distribution function device and the distribution cable can be performed efficiently in a short time.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
(First embodiment)
FIG. 1 is a diagram illustrating a configuration example of a television joint viewing facility in an apartment house or the like according to the first embodiment of the present invention. In FIG. 1, reference numeral 1 denotes a TV antenna for joint reception. For example, a UHF antenna, a VHF antenna, and a parabolic antenna are used alone or in combination. In some cases, instead of the TV antenna 1 for joint reception, a TV signal transmitted from a CATV system head-end device via a cable may be used.
[0011]
The TV signal received by the TV antenna 1 is amplified by an amplifier 2 and input to a device having a distribution function, for example, a distributor 3. The distributor 3 includes a plurality of distribution terminals 4a to 4n, and the levels of distribution signals output from the distribution terminals 4a to 4n are set in advance according to the distribution conditions of the television joint viewing facility.
[0012]
One ends of distribution cables 5a to 5n are connected to the distribution terminals 4a to 4n of the distributor 3. The distribution cables 5a to 5n are wired in the apartment house via the junction box 6, and the ends thereof are connected to, for example, common receiving devices such as TV signal boosters 7a to 7n arranged corresponding to the rooms on each floor. The The signal output terminals of the boosters 7a to 7n are connected to the TV terminal 8 provided in each room.
[0013]
Predetermined predetermined distribution cables 5a to 5n are connected to the distribution terminals 4a to 4n of the distributor 3, and at this time, the distribution cables 5a to 5n are connected using the cable identifier 10 shown in FIG. The wiring position, that is, which of the boosters 7a to 7n is connected is identified.
[0014]
Note that FIG. 1 shows the case where the distributor 3 is used as a device having a distribution function. However, for example, a head amplifier or a head end having a distribution function is also used for identifying a cable to be connected. can do. In the headend and head amplifier, the trunk cable to be connected to each output terminal is determined, so it is necessary to identify where the trunk cable is wired. 10 is used.
[0015]
As shown in FIG. 2, the cable discriminator 10 includes a microcomputer (hereinafter abbreviated as “microcomputer”) 11, a display 12, a measurement reference resistor 13, a power supply unit 14, and a measurement terminal 15.
[0016]
The microcomputer 11 includes an A / D converter 111, a level determination unit 112, and a driver 113, and an operating voltage of, for example, 5V is applied from the power supply unit 14. The input terminal of the A / D converter 111 is connected to the + side of the measurement terminal 15. A measurement voltage is applied to the + side of the measurement terminal 15 from the power supply unit 14 via the measurement reference resistor 13. The power supply unit 14 outputs a predetermined voltage, for example, a DC voltage of 5V as described above, based on the voltage of the battery.
[0017]
The measurement terminal 15 is connected to one end of the distribution cables 5a to 5n to be measured. The measurement reference resistor 13 is connected in series to, for example, an identification resistor 21 provided as identification data generating means at the input terminals of the boosters 7a to 7n, as will be described in detail later, and separates the terminal voltage of the power supply unit 14. For example, a value of 9.1 kΩ is used.
[0018]
The A / D converter 111 converts an analog voltage generated at the measurement terminal 15 into digital data and inputs the digital data to the level determination unit 112. The level discriminating unit 112 discriminates the voltage level converted by the A / D converter 111 and displays a booster identification display corresponding thereto, for example, a booster number on the display unit 12 through the driver 113. As this indicator 12, 7-segment LED of 1 to several digits is used, for example, and the booster number discriminated by the level discriminating unit 112 is displayed.
[0019]
FIG. 3 shows a schematic configuration example of the boosters 7a to 7n. The boosters 7a to 7n have a configuration in which an amplifier 24 is connected between the input terminal 22 and the output terminal 25 via a capacitor 23. Further, the identification resistor 21 is connected in parallel to the input terminal 22, that is, The input terminal 22 is provided between the + terminal and the − terminal. The identification resistor 21 is set to a value corresponding to the booster number, and is set in the range of 1 kΩ to 100 kΩ, for example. That is, the value of the identification resistor 21 is set at an equal ratio so that the voltage generated at the measurement terminal 15 of the cable identification device 10 changes at equal intervals. The booster number set according to the value of the identification resistor 21 is described in the cases of the boosters 7a to 7n.
[0020]
FIG. 4 shows the relationship between the setting example of the identification resistor 21 and the measurement voltage. FIG. 4 shows an example in which the value of the measurement reference resistor 13 is 6 kΩ, the input impedance of the A / D converter 111 is infinite, and the voltage of the power supply unit 14 is 5V. As long as the value of the identification resistor 21 is sufficiently larger than the input impedance of the boosters 7a to 7n, the booster characteristics are not affected. The input impedance of the boosters 7a to 7n is generally 75Ω.
[0021]
When the boosters 7a to 7n are installed, those having different booster numbers, that is, the values of the identification resistors 21 are used. In this case, it is determined in advance where and how many boosters are installed, or after the booster is installed, the correspondence between the installation location and the booster number is confirmed.
[0022]
When the distribution cables 5a to 5n and the boosters 7a to 7n are installed, and the distribution cables 5a to 5n are connected to the distribution terminals 4a to 4n of the distributor 3, the cable identifiers are connected to the distribution cables 5a to 5n. 10 are sequentially connected, the booster number, that is, the number of the distribution cables 5a to 5n is confirmed, and the connection to the distributor 3 is performed according to the cable number.
[0023]
The measurement terminal 15 of the cable discriminator 10 is a connector that is compatible with the cable end connector, and can be easily attached to and detached from the cable to be identified. For example, when the distribution cable 5a is connected to the measurement terminal 15, the booster identification resistor 21 connected to the distribution cable 5a is connected in series to the measurement reference resistor 13 of the cable identification unit 10, The voltage of the power supply unit 14 is divided by the measurement reference resistor 13 and the identification resistor 21. The divided analog voltage is converted into digital data by the A / D converter 111 and output to the level determination unit 112. The level discriminating unit 112 discriminates the level of the divided voltage from the output data of the A / D converter 111, outputs a booster number corresponding to the level to the driver 113, and displays it on the display unit 12.
[0024]
Therefore, the operator can easily confirm the number of the booster connected to the distribution cable 5a at the distributor 3, and the installation position can be known from this booster number. 5a can be correctly connected to a predetermined distribution terminal of the distributor 3.
[0025]
Thereafter, similarly, the operator sequentially confirms the numbers of the boosters 7a to 7n connected to the distribution cables 5a to 5n by the cable identifier 10 and connects to the distribution terminals 4a to 4n of the corresponding distributor 3. To do.
[0026]
When the number of boosters 7a to 7n to be installed is larger than the number of booster numbers set in advance, the boosters 7a to 7n are divided for each system so that the booster numbers do not overlap in each system. The distribution cables 5a to 5n can be accurately identified by performing the booster number measurement operation in a state where the booster of the system with the overlapping booster numbers is separated from the distribution cable.
[0027]
In the first embodiment, the case where the identification resistors 21 of the boosters 7a to 7n are set to different values has been described. In addition, for example, as shown in FIG. It is also possible to provide a plurality of identification resistors 21 different from each other and switch them using a changeover switch such as the rotary switch 16. The rotary switch 16 is switched by, for example, a knob or a driver. By switching the identification resistor 21 using the rotary switch 16 in this way, the booster number can be arbitrarily switched and set only by preparing one type of booster, and the manufacture and management of the booster are easy. Become.
[0028]
(Second Embodiment)
Next, a second embodiment of the present invention will be described.
FIG. 6 is a diagram illustrating a configuration example of the cable identifier 10 and the boosters 7a to 7n according to the second embodiment of the present invention. In the second embodiment, an identification capacitor 31 is provided in the boosters 7a to 7n instead of the identification resistor 21 shown in the first embodiment, and the capacitance of the identification capacitor 31 is determined by the cable identifier 10. The booster number is identified.
[0029]
In the cable discriminator 10, a pulse generator 17 that operates according to the supply voltage of the power supply unit 14 is provided, and for example, a pulse signal having a frequency of 100 kHz and a duty ratio of 50% is generated. The pulse signal generated by the pulse generator 17 is input to the capacity determination unit 114 and output to the measurement terminal 15 via the resistor 18. Further, the microcomputer 11 includes an A / D converter 111, a capacity determination unit 114, and a driver 113, and the capacity determination unit 114 determines the capacity of the identification capacitor 31 provided in the boosters 7a to 7n.
[0030]
For the identification capacitors 31 provided in the boosters 7a to 7n, for example, capacitors having a capacity of 0.1 μF to 500 pF are used, and the booster number is set according to the capacitance value.
[0031]
In the above configuration, when, for example, the distribution cable 5a is connected to the measurement terminal 15 of the cable discriminator 10, the pulse signal generated by the pulse generator 17 is output from the measurement terminal 15 via the resistor 18, and the distribution cable 5a. Is supplied to the booster identification capacitor 31 connected to. That is, an integrating circuit is formed by the resistor 18 and the identification capacitor 31, and charging / discharging of the identification capacitor 31 is repeated according to the time constant of the resistor 18 and the identification capacitor 31.
[0032]
FIG. 7A shows a pulse signal waveform generated by the pulse generator 17, and FIG. 7B shows a charging waveform of the identification capacitor 31. In the positive half cycle of the pulse signal, the identification capacitor 31 is charged, and in the negative half cycle of the pulse signal, the charge charged in the identification capacitor 31 is discharged.
[0033]
The cable identifier 10, the capacity determination unit 114, FIG. 7 (a), the identification capacitor 31 and then inverted pulse signal is positive from the point t ₀ of the pulse signal falls, as shown in (b) measuring the charging time T until time t ₁ that the charging voltage reaches the threshold value E1 set in advance, and displays to determine the number of booster 7a~7n on the display 12 by the time T. That is, since the charging time T until the charging voltage of the identification capacitor 31 reaches the threshold value E1 varies depending on the capacity, the capacity determination unit 114 measures the charging time T of the identification capacitor 31. Thus, the capacity of the identification capacitor 31 can be determined, and the booster number can be determined from this capacity.
[0034]
Incidentally, in the second embodiment shows a case of starting the measuring operation of the charge time T from the time t ₀ when the pulse signal falls, and starts measuring operation of the charging time T from when the pulse signal rises You may do it.
[0035]
Even when the boosting capacitors 7a to 7n are provided with the identification capacitors 31 as described above, the booster numbers connected to the distribution cables 5a to 5n at the distributor 3 can be easily set as in the first embodiment. Since the booster installation position can be known from this booster number, the distribution cables 5a to 5n can be correctly connected to the distribution terminals of the distributor 3 determined in advance.
[0036]
(Third embodiment)
Next, a third embodiment of the present invention will be described.
FIG. 8 shows a configuration example of the cable discriminator 10 and the boosters 7a to 7n according to the third embodiment. In the third embodiment, an ID chip 40 is provided in the boosters 7a to 7n instead of the identification resistor 21 shown in the first embodiment, and the ID number of the identification ID chip 40 is determined by the cable identification device 10. The booster number is identified.
[0037]
The cable identifier 10 includes a microcomputer 11, a display 12, a power supply unit 14, a measurement terminal 15, and a resistor 18. The microcomputer 11 includes a modem 115, an ID determination unit 116, and a driver 113, and operates with a supply voltage from the power supply unit 14. Moreover, the cable discriminator 10 outputs the terminal voltage of the power supply part 14 from the measurement terminal 15 via the resistor 18, and supplies it to the boosters 7a-7n via the distribution cables 5a-5n.
[0038]
The modem 115 is connected from the measurement terminal 15 to the boosters 7a to 7n via the distribution cables 5a to 5n, and transmits / receives data to / from the ID chip 40 provided in the boosters 7a to 7n. The received ID number is received and input to the ID determination unit 116. The ID determination unit 116 determines the ID number sent from the ID chip 40 and displays it on the display 12.
[0039]
On the other hand, the ID chip 40 provided in the boosters 7a to 7n includes a modem 41 for transmitting / receiving data to / from the modem 115 of the cable discriminator 10 and a memory for storing ID numbers, such as a ROM 42, as shown in FIG. . In the ROM 42, ID numbers of the boosters 7a to 7n are written in advance by, for example, a code of several bits. Further, the ID chip 40 stores a DC voltage supplied from the power supply unit 14 of the cable discriminator 10 via the resistor 18 in the capacitor 44 via the resistor 43 and supplies it as an operating voltage to the modem 41 and the ROM 42.
[0040]
In the above configuration, when, for example, the distribution cable 5a is connected to the measurement terminal 15 of the cable discriminator 10, the DC voltage output from the power supply unit 14 via the resistor 18 is connected to the distribution cable 5a. It is supplied to the ID chip 40. The ID chip 40 stores the DC voltage supplied from the cable discriminator 10 in the capacitor 44 via the resistor 43 and supplies it as an operating voltage to the modem 41 and the ROM 42.
[0041]
The cable discriminator 10 communicates with the modem 41 of the ID chip 40 via the distribution cable 5a by the modem 115, reads the ID number stored in the ROM 42, and outputs it to the ID discrimination unit 116. The ID determination unit 116 determines the ID number read from the ID chip 40 and displays the determined number on the display 12.
[0042]
Even when the ID chip 40 is provided in the boosters 7a to 7n as described above, the booster number connected to the distribution cables 5a to 5n at the distributor 3 can be easily set as in the case of the first embodiment. Since it can be confirmed, the distribution cables 5a to 5n can be correctly connected to the predetermined distribution terminals of the distributor 3.
[0043]
In addition, when the ID chip 40 is used, a very large number of ID numbers can be set by increasing the number of bits of the ROM 42, which is a TV joint viewing facility installed in a large-scale housing complex, and a very large number of boosters. Even when installing 7a-7n, each booster 7a-7n can be identified reliably and easily.
[0044]
The ROM 42 can be composed of several tens to several hundreds of bits and can store a very large amount of information. Thus, not only the booster number but also the booster device number, manufacturing number, etc. are set. be able to. Therefore, when connecting the distribution cables 5a to 5n to the distributor 3, it is possible to easily confirm not only the booster number but also the performance and the like from the booster device number.
[0045]
In the third embodiment, the case where the ID chip 40 is provided in the boosters 7a to 7n is shown. However, as shown in FIG. 10, for example, the ID adapter 50 including the ID chip 40 is connected to the distribution cables 5a to 5n and the booster. 7a to 7n may be connected, and the cable identifier 10 may identify the ID number of each ID adapter 50.
[0046]
If the boosters 7a to 7n are not connected to the distribution cables 5a to 5n, only the ID adapter 50 is connected to the distribution cables 5a to 5n as shown in FIG. The ID number of each ID adapter 50 may be identified.
[0047]
The adapter is not limited to the ID adapter 50, and instead of the ID chip 40, an identification resistor 21 is provided as shown in the first embodiment so that the cable can be identified, or As shown in the second embodiment, an identification capacitor 31 may be provided so that the cable can be identified.
[0048]
In the third embodiment, the case where the ID chip 40 is provided in the boosters 7a to 7n has been described. However, the booster 7a to 7n is not limited to the booster, and other joint receiving devices, for example, a branch / distributor 51 as shown in FIG. The ID chip 40 may be provided therein, and the ID number of the ID chip 40 provided in each branch / distributor 51 may be identified by the cable identifier 10.
[0049]
Further, the branch / distributor 51 is provided with the identification resistor 21 shown in the first embodiment or the identification capacitor 31 shown in the second embodiment, instead of the ID chip 40, and the cable identifier 10. The number of the branch / distributor 51 may be identified.
[0050]
【The invention's effect】
As described above in detail, according to the present invention, in a television joint viewing facility installed in an apartment house or the like, a plurality of distribution cables can be easily and reliably identified on the device side having a distribution function, and can be used as a distribution terminal of the device. A predetermined distribution cable can be correctly connected, and the connection work between the device and the distribution cable can be efficiently performed in a short time.
[Brief description of the drawings]
FIG. 1 is a diagram showing a configuration example of a television joint viewing facility in an apartment house or the like according to a first embodiment of the present invention.
FIG. 2 is a view showing a configuration example of a cable discriminator in the embodiment.
FIG. 3 is a diagram showing a schematic configuration example of a booster in the embodiment.
FIG. 4 is a diagram showing a relationship between a measurement example and a setting example of an identification resistor provided in the booster according to the embodiment;
FIG. 5 is a diagram showing a configuration example in the case where a plurality of identification resistors are switched by a rotary switch in the embodiment.
FIG. 6 is a diagram showing a configuration example of a cable discriminator and a booster according to a second embodiment of the present invention.
FIG. 7 is a view showing signal waveforms at various parts for explaining the operation of the embodiment;
FIG. 8 is a diagram illustrating a configuration example of a cable discriminator and a booster according to a third embodiment of the present invention.
FIG. 9 is a view showing a configuration example of an ID chip in the embodiment.
FIG. 10 is a diagram showing an example when an ID adapter is connected to a booster.
FIG. 11 is a diagram showing an example when an ID adapter is used alone.
FIG. 12 is a diagram showing an example in which an ID chip is provided in a branch / distributor.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... TV antenna 2 ... Amplifier 3 ... Dividers 4a-4n ... Distribution terminal 5a-5n ... Distribution cable 6 ... Junction box 7a-7n ... Booster 8 ... TV terminal 10 ... Cable discriminator 11 ... Microcomputer 111 ... D converter DESCRIPTION OF SYMBOLS 112 ... Level discrimination | determination part 113 ... Driver 114 ... Capacity discrimination | determination part 115 ... Modem 116 ... ID discrimination | determination part 12 ... Display 13 ... Reference resistor 14 for a measurement ... Power supply part 15 ... Measurement terminal 16 ... Rotary switch 17 ... Pulse generator 18 ... Resistor 21 ... Identification resistor 22 ... Input terminal 23 ... Capacitor 24 ... Amplifier 25 ... Output terminal 31 ... Identification capacitor 40 ... ID chip 41 ... Modem 42 ... ROM
43 ... resistor 44 ... capacitor 50 ... ID adapter 51 ... branch / distributor

Claims (2)

The signal terminal of the TV signal input terminal and the internal circuit are connected by a capacitor, an identification resistor having a resistance value of 1 kΩ or more and 100 kΩ or less is connected between the signal terminal and the ground, and the resistance value is set for each booster. For a television signal for a television co-viewing facility, wherein the booster can be identified from an external device by setting the resistance value to a unique value and the resistance value of the identification resistor of the television signal input terminal. booster. A signal terminal of the TV signal input terminal and an internal circuit are connected by a capacitor, and an ID chip storing identification information is connected between the signal terminal and the ground , and the TV signal input terminal is connected to the ID chip by an external device. A TV signal booster for a TV joint viewing facility, wherein the stored identification information for booster identification can be read out .

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