JP6936598B2 - Receiver - Google Patents

Description

The present invention relates to a receiving device.

In recent years, in CATV (Cable Television) systems, the transition from HFC (Hybrid Fiber Coaxial) to FTTH (Fiber To The Home) is progressing. As a result, as disclosed in paragraph 0004 of Patent Document 1, satellite broadcasting that could not be viewed without a dedicated STB (Set Top Box) can now be viewed by a television receiver without an STB. ing.

Japanese Unexamined Patent Publication No. 2009-021990

When the CATV operator is transmitting not only terrestrial digital broadcasting but also satellite broadcasting, and the receiving device located on the subscriber side can also receive satellite broadcasting, the service subscriber is satellite broadcasting. Even if you do not watch the program at all, you will still have to pay the reception fee for satellite broadcasting.

Therefore, for subscribers who do not wish to receive satellite broadcasts, a receiver that cannot receive satellite broadcasts is provided, and for subscribers who wish to receive satellite broadcasts, a receiver that can receive satellite broadcasts. By providing the above-mentioned problems, the above-mentioned problems can be solved.

However, such a method has a problem that the manufacturing cost is high because it is necessary to prepare two types of receiving devices that can receive satellite broadcasts and those that cannot receive satellite broadcasts.

The present invention has been made in view of the above points, and it is not necessary to prepare two types of receiving devices, and it is possible to watch satellite broadcasting according to the contract status of the subscriber without increasing the manufacturing cost. It is an object of the present invention to provide a receiving device which can be selected.

In order to solve the above problems, the present invention relates to a receiving device that receives a CATV broadcast signal and an optical signal including a satellite broadcast signal in a frequency band higher than the CATV broadcast signal, converts it into an electric signal, and outputs the signal. A first power supply voltage is supplied from the power supply circuit to the receiving device, or a second power supply voltage having a voltage lower than the first power supply voltage is supplied from the power supply circuit to the receiving device, and the first power supply voltage and the first power supply voltage are supplied . The detection means for detecting either of the two power supply voltages, the conversion means for converting the optical signal including the CATV broadcast signal and the satellite broadcast signal into the electric signal, and the detection means for detecting the first power supply voltage. In the case of the above, it is characterized by having the CATV broadcast signal included in the electric signal obtained by the conversion means and the attenuation means for attenuating the satellite broadcast signal among the satellite broadcast signals.

Further, the present invention is characterized in that the attenuation means attenuates the satellite broadcast signal by changing the operation of the processing circuit for processing the satellite broadcast signal.
According to such a configuration, by changing the operation, it is not necessary to prepare two types of receiving devices, and it is easy to watch satellite broadcasting according to the contract status of the subscriber without increasing the manufacturing cost. It becomes possible to select.

Further, the present invention is characterized in that the attenuation means attenuates the satellite broadcast signal by stopping the operation of the amplifier that amplifies the satellite broadcast signal included in the processing circuit.
According to such a configuration, by stopping the operation of the amplifier inside the receiving device, it is not necessary to prepare two types of receiving devices, and satellite broadcasting is performed according to the contract status of the subscriber without increasing the manufacturing cost. It is possible to easily select whether or not to watch the TV, and it is possible to suppress the consumption of the power supply when the operation of the amplifier is stopped.

Further, the present invention is characterized in that the attenuation means attenuates the satellite broadcast signal by changing the cutoff frequency of the low-pass filter included in the processing circuit.
With such a configuration, it is not necessary to prepare two types of receiving devices, and it is possible to easily select whether or not to watch satellite broadcasting according to the contract status of the subscriber without increasing the manufacturing cost. Become.

According to the present invention, it is not necessary to prepare two types of receiving devices, and it is possible to provide a receiving device capable of selecting whether or not to watch satellite broadcasting according to the contract status of a subscriber without increasing the manufacturing cost. It becomes possible.

It is a figure which shows the structural example of the receiving apparatus which concerns on 1st Embodiment of this invention. It is a figure which shows the structural example of the V-ONU shown in FIG. It is a figure which shows the structural example of the power supply circuit shown in FIG. It is a figure which shows the structural example of the conventional V-ONU. It is a figure which shows the structural example of the conventional power supply circuit. It is a figure for demonstrating the operation of 1st Embodiment. It is a figure which shows the structural example of the 2nd Embodiment. It is a figure which shows the structural example of the 3rd Embodiment. It is a figure for demonstrating the operation of 3rd Embodiment. It is a figure which shows the structural example of 4th Embodiment. It is a figure which shows the structural example of 5th Embodiment. It is a figure for demonstrating the operation of 5th Embodiment. It is a figure which shows the structural example of the 6th Embodiment. It is a figure for demonstrating the operation of 6th Embodiment. It is a figure which shows the structural example of 7th Embodiment. It is a figure for demonstrating the operation of 7th Embodiment. It is a figure which shows the structural example of 8th Embodiment. It is a figure for demonstrating the operation of 8th Embodiment.

Next, an embodiment of the present invention will be described.

(A) Explanation of the configuration of the first embodiment of the present invention FIG. 1 is a diagram showing a configuration example of the first embodiment of the present invention. FIG. 1A shows a configuration example when the power supply circuit 50 is integrally configured with the V-ONU (Video-Optical Network Unit) 10 (integrated type), and FIG. 1B shows a power supply circuit. A configuration example is shown when 50 is separately configured (separate type). In the present embodiment, either the integrated type shown in FIG. 1 (A) or the separated type shown in FIG. 1 (B) may be used.

In the integrated configuration example shown in FIG. 1A, the receiving device 1 has a V-ONU 10 and a power supply circuit 50, and is installed on, for example, an outer wall surface of a subscriber's house. , The optical fiber 2 is connected, and the electric signal output from the V-ONU 10 is drawn into the subscriber's house by the coaxial cable 4. The power supply circuit 50 and the V-ONU 10 are connected by a power supply line 3.

Further, in the separation type configuration example shown in FIG. 1B, the receiving device 1 has a V-ONU 10, for example, is installed on the outer wall surface of the subscriber's house, and the V-ONU 10 has an optical fiber 2 Is connected, and the electric signal output from the V-ONU 10 is drawn into the subscriber's house by the coaxial cable 4. A power supply circuit 50 is arranged in the subscriber's house to supply DC power to the V-ONU 10 via the coaxial cable 4.

The V-ONU 10 and the power supply circuit 50 shown in FIGS. 1A and 1B have the same configuration.

FIG. 2 is a diagram showing a configuration example of the V-ONU 10 shown in FIG. In the configuration example shown in FIG. 2, the V-ONU 10 has an optical input terminal 11, an LED (Light Emitting Diode) indicator 12, 13, an O / E (Optical / Electronic) 14, an ALM (Alarm) 15, an amplifier 16, 18, and so on. AGC (Automatic Gain Control) 17, 19, AGC control unit 20, HPF (High Pass Filter) 21, 27, LPF (Low Pass Filter) 22, 28, amplifiers 23 to 26, branching device 29, capacitors 30, 31, monitor The output terminal 32, the RF output terminal 33, the coil 34, the diode 35, the power supply terminal 36, the DC / DC 37, the detection unit 41, and the BS / CS control unit 42 are the main components.

Here, the optical input terminal 11 inputs an optical signal transmitted from the transmission device on the CATV operator side via the optical fiber 2 and supplies the optical signal to the O / E 14. The LED indicator 12 is an indicator that lights up when an abnormality has occurred in the received optical signal to convey the abnormality. The LED indicator 13 is an indicator indicating that power is being supplied.

The O / E14 converts an optical signal input from an optical input terminal into an electric signal and outputs it. The ALM 15 turns on the LED indicator 12 when an abnormality occurs in the optical signal input from the optical input terminal.

The amplifier 16 amplifies the electric signal output from the O / E 14 with a predetermined gain and outputs the signal. The AGC 17 is controlled by the AGC control unit 20 and adjusts the level of the electric signal output from the amplifier 16. The amplifier 18 amplifies and outputs an electric signal output from the AGC 17 with a predetermined gain. The AGC 19 is controlled by the AGC control unit 20 and adjusts the level of the electric signal output from the amplifier 18.

The AGC control unit 20 adjusts the AGCs 17 and 19 so that the level of the output signal of the AGC19 becomes a predetermined level. The HPF 21 passes the BS / CS broadcast signal, which is a satellite broadcast signal, from the signal output from the AGC 19, attenuates signals of other frequencies, and outputs the signal. The LPF 22 passes the CATV broadcast signal from the signal output from the AGC 19, attenuates signals of other frequencies, and outputs the signal.

The amplifiers 23 and 24 amplify and output the BS / CS broadcast signal output from the HPF 21. The amplifiers 25 and 26 amplify and output the CATV broadcast signal output from the LPF 22.

The HPF 27 passes the BS / CS broadcast signal from the signal output from the amplifier 24, attenuates signals of other frequencies, and outputs the signal. The LPF 28 passes the CATV broadcast signal from the signal output from the amplifier 26, attenuates signals of other frequencies, and outputs the signal.

The turnout 29 branches the signals output from the HPF 27 and the LPF 28 and supplies them to the capacitor 30 and the capacitor 31, respectively. The capacitor 30 is a coupling capacitor, passes a high frequency signal supplied from the turnout 29, attenuates the DC component, and supplies the DC component to the monitor output terminal 32. Similarly, the capacitor 31 is also a coupling capacitor, passes a high frequency signal supplied from the turnout 29, attenuates the DC component, and supplies the DC component to the RF output terminal 33.

The monitor output terminal 32 outputs a high frequency signal output from the capacitor 30. The RF output terminal 33 outputs a high-frequency signal output from the capacitor 31 and inputs DC power as power supply power.

The coil 34 is a choke coil, and supplies the DC power input from the RF output terminal 33 to the diode 35 without attenuating it, and also attenuates the high frequency signal output from the capacitor 31 and supplies it to the diode 35. The diode 35 is a backflow prevention diode and prevents DC power from being output to the RF output terminal 33 side.

The power supply terminal 36 is a terminal to which power supply power is supplied. The DC / DC 37 adjusts and outputs the voltage of the DC power supplied from the RF output terminal 33 or the power supply terminal 36.

The detection unit 41 detects the voltage of the DC power supplied from the RF output terminal 33 or the power supply terminal 36 and supplies it to the BS / CS control unit 42. The BS / CS control unit 42 controls the operating states of the amplifiers 23 and 24 according to the power supply voltage detected by the detection unit 41.

FIG. 3 is a diagram showing a configuration example of the power supply circuit 50 shown in FIG. As shown in FIG. 3, the power supply circuit 50 includes a power plug 51, a fuse 52, a varistor 53, an AVR (Automatic Voltage Regulator) 54, a coil 55, a capacitor 56, an RF output terminal 57, an RF input terminal 58, and a DC connector 59. The LED indicator 60 is a main component.

The power plug 51 is connected to a commercial power source and inputs 100 V AC power. The fuse 52 protects the circuit in the subsequent stage by blowing when an excessive current flows. When an excessive voltage (for example, a high voltage due to lightning) or the like is applied to the commercial power supply, the varistor 53 short-circuits and absorbs the voltage to protect the power supply circuit 50.

The AVR 54 steps down the AC power of 100V, rectifies it, converts it into a DC voltage, and outputs it. The AVR 54 has a voltage switching unit 541. The voltage switching unit 541 is capable of switching between the first voltage V1 and the second voltage V2. The voltage can be changed by, for example, switching the reference voltage of the switching regulator, switching the switching frequency, or switching the switching pulse width. The instruction for switching the power supply voltage can be given, for example, by switching the DIP switch, depending on whether or not a jumper wire is connected, or by an external control signal (electrical signal or the like).

The coil 55 is a choke coil that attenuates a high frequency signal input from the RF input terminal 58. The capacitor 56 is a coupling capacitor for cutting off the DC power output from the AVR 54.

The RF output terminal 57 is a terminal connected to a television receiver (not shown) to supply a high frequency signal. The RF input terminal 58 is a terminal connected to the V-ONU 10 to supply DC power to the V-ONU 10 and input a high frequency signal output from the V-ONU 10.

The DC connector 59 is a terminal connected to the power supply terminal 36 shown in FIG. The LED indicator 60 is an indicator that lights up when DC power is output from the AVR 54.

(B) Description of Operation of First Embodiment Next, the operation of the first embodiment of the present invention will be described. In the following, for comparison, the conventional configuration and operation will be described with reference to FIGS. 4 and 5, and then the operation of the first embodiment of the present invention will be described.

FIG. 4 is a diagram showing a configuration of a conventional V-ONU 10. In FIG. 4, the same reference numerals are given to the portions corresponding to those in FIG. 2, and the description thereof will be omitted. In FIG. 4, the detection unit 41 and the BS / CS control unit 42 are excluded as compared with FIG. The configuration other than these is the same as in FIG.

FIG. 5 is a diagram showing a configuration of a conventional power supply circuit 50. In FIG. 5, the same reference numerals are given to the portions corresponding to those in FIG. 3, and the description thereof will be omitted. In FIG. 5, the voltage switching unit 541 is excluded from the AVR 54 as compared with FIG. Other configurations are the same as in FIG.

Next, the operation of the conventional configuration shown in FIGS. 4 and 5 will be described. In the case of the conventional configuration, the power supply circuit 50 supplies the power supply power of a constant voltage to the V-ONU 10.

The V-ONU 10 inputs an optical signal transmitted from a transmission device on the CATV operator side via the optical fiber 2. This optical signal includes a CATV broadcast signal (for example, 70 to 770 MHz) and a BS / CS broadcast signal (for example, 1032 to 3224 MHz). Such an optical signal is converted into an electric signal by O / E14 and output.

The electric signal output from the O / E14 is amplified and output by the amplifiers 16 and 18 and the AGCs 17 and 19. Since the AGC control unit 20 refers to the output signal of the O / E14 and controls the signal output from the AGC 19 to be at a predetermined level, the AGC 19 outputs an electric signal of a predetermined level.

The electric signal output from the AGC 19 is supplied to the HPF 21 and the LPF 22. The HPF 21 passes the BS / CS broadcast signal included in the electric signal, attenuates the other signals, and outputs the signal. The LPF 22 passes the CATV broadcast signal included in the electric signal, attenuates the other signals, and outputs the signal.

The amplifiers 23 and 24 amplify and output the BS / CS broadcast signal supplied from the HPF 21. The HPF 27 passes the BS / CS broadcast signal included in the electric signal output from the amplifier 24, attenuates the other signals, and outputs the signal.

The amplifiers 25 and 26 amplify and output the CATV broadcast signal supplied from the LPF 22. The LPF 28 passes the CATV broadcast signal included in the electric signal output from the amplifier 26, attenuates the other signals, and outputs the signal.

The BS / CS broadcast signal supplied from the HPF 27 and the CATV broadcast signal supplied from the LPF 28 are combined and then branched by the turnout 29 and supplied to the capacitors 30 and 31. The capacitors 30 and 31 pass high frequency components, cut off DC components, and supply them to the monitor output terminal 32 and the RF output terminal 33, respectively.

Since a television receiver (not shown) is connected to the RF output terminal 33, the high frequency signal including the BS / CS broadcast signal and the CATV broadcast signal output from the RF output terminal 33 is supplied to the television receiver. Will be done.

With the television receiver, not only CATV broadcasts but also BS / CS broadcasts can be viewed. Therefore, since the BS / CS broadcast can also be received at the subscriber's house by the agreement of the subscriber, the obligation to pay the reception fee for the BS / CS broadcast arises.

Next, the operation of the first embodiment of the present invention will be described.

In the first embodiment, the voltage switching unit 541 switches the output voltage according to the contract state of the subscriber. More specifically, if the subscriber has a BS / CS broadcast viewing contract, a voltage of 11 V or less is selected as the output voltage, and if the subscriber does not have a BS / CS broadcast viewing contract. Selects an output voltage above 11V. The act of selection may be either a CATV operator or a subscriber.

For example, when the subscriber has a viewing contract for BS / CS broadcasting, a voltage of 11 V or less (for example, 10 V) is output from the AVR 54. The DC voltage output from the AVR 54 is supplied to the RF output terminal 33 of the V-ONU 10 via the RF input terminal 58.

The power supply power supplied to the RF output terminal 33 is supplied to the DC / DC 37 via the coil 34 and the diode 35, and is also supplied to the detection unit 41.

The DC / DC 37 steps down or boosts the power supply power supplied from the RF output terminal 33 to a predetermined voltage and supplies it to each part of the apparatus. As a result, the V-ONU 10 can be operated.

The detection unit 41 detects the voltage of the power supply power supplied from the RF output terminal 33 and notifies the BS / CS control unit 42. The BS / CS control unit 42 controls the amplifiers 23 and 24 based on the voltage detected by the detection unit 41. That is, when the voltage detected by the detection unit 41 is 11 V or less, the amplifiers 23 and 24 are put into an operating state. As a result, the BS / CS broadcast signal output from the HPF 21 is amplified and output via the HPF 27. As a result, the BS / CS broadcast signal is supplied to the television receiver together with the CATV broadcast signal, so that the subscriber can watch both the CATV broadcast and the BS / CS broadcast.

On the other hand, if the subscriber does not have a viewing contract for BS / CS broadcasting, the AVR 54 outputs a voltage exceeding 11V (for example, 15V). The DC voltage output from the AVR 54 is supplied to the RF output terminal 33 of the V-ONU 10 via the RF input terminal 58.

The power supply power supplied to the RF output terminal 33 is supplied to the DC / DC 37 via the coil 34 and the diode 35, and is also supplied to the detection unit 41.

The DC / DC 37 steps down or boosts the power supply power supplied from the RF output terminal 33 to a predetermined voltage and supplies it to each part of the apparatus. As a result, the V-ONU 10 can be operated. Even if the power supply voltage supplied from the power supply circuit 50 changes, the DC / DC 37 outputs a constant voltage, so that the V-ONU 10 can operate stably.

The detection unit 41 detects the voltage of the power supply power supplied from the RF output terminal 33 and notifies the BS / CS control unit 42. The BS / CS control unit 42 controls the amplifiers 23 and 24 based on the voltage detected by the detection unit 41. That is, when the voltage detected by the detection unit 41 exceeds 11V, the operations of the amplifiers 23 and 24 are stopped. As a result, the BS / CS broadcast signal output from the HPF 21 is not output from the amplifier 24. As a result, only the CATV broadcast signal is supplied to the television receiver, so that the subscriber can watch only the CATV broadcast.

That is, in the first embodiment, as shown in FIG. 6, when the power supply voltage output from the AVR 54 is set to 11 V or less by the power supply switching unit 451, both CATV broadcasting and BS / CS broadcasting can be viewed. Become. On the other hand, when the power supply voltage output from the AVR 54 is set to a voltage exceeding 11 V, only CATV broadcasting can be viewed.

As described above, according to the first embodiment of the present invention, the BS / CS broadcast signal is supplied or cut off by the power supply voltage supplied to the V-ONU 10, so that two types of receiving devices are prepared. It is no longer necessary, and it is possible to select whether or not to watch BS / CS broadcasting according to the contract status of the subscriber without increasing the manufacturing cost.

Further, in the first embodiment, since the possibility of viewing the BS / CS broadcast is selected by switching the power supply voltage that cannot be seen by the subscriber, the uncontracted subscriber illegally watches the BS / CS broadcast. Can be prevented.

(C) Description of the configuration of the second embodiment Next, the second embodiment of the present invention will be described. FIG. 7 is a diagram showing a configuration example of a second embodiment of the present invention. In FIG. 7, the same reference numerals are given to the portions corresponding to those in FIG. 2, and the description thereof will be omitted. In FIG. 7, a SPDT SW (Single Pole Double Throw Switch) 43 is added between the HPF 21 and the amplifier 23 as compared with FIG. Other configurations are the same as in FIG.

Here, the SPDT SW43 is a switch whose connection state is controlled by the BS / CS control unit 42. More specifically, when the power supply voltage detected by the detection unit 41 is 11V or less, the input terminal of the amplifier 23 is selected for the signal of the output terminal of the HPF 21, and the power supply voltage detected by the detection unit 41 is 11V. If it exceeds, it is controlled to select a terminating resistor (not shown).

(D) Description of Operation of Second Embodiment Next, the operation of the second embodiment of the present invention will be described. When the power supply voltage supplied from the power supply circuit 50 is 11 V or less, the BS / CS control unit 42 controls the SPDT SW43 to select the input terminal of the amplifier 23. As a result, the BS / CS broadcast signal output from the HPF 21 is supplied to the amplifier 23 via the SPDT SW43. Since the subsequent operations are the same as those in the first embodiment, the description thereof will be omitted.

On the other hand, when the power supply voltage supplied from the power supply circuit 50 exceeds 11 V, the BS / CS control unit 42 controls the SPDT SW43 to select a terminating resistor (not shown). As a result, the BS / CS broadcast signal output from the HPF 21 is supplied to the terminating resistor via the SPDT SW43, and is not supplied to the amplifier 23. Therefore, since the BS / CS broadcast signal is not supplied to the television receiver, the subscriber cannot watch the BS / CS broadcast. In the second embodiment, the BS / CS broadcast signal output from the HPF 21 is supplied to the terminating resistor via the SPDT SW43, so that impedance matching is achieved and impedance mismatching is prevented. Can be done.

As described above, according to the second embodiment of the present invention, the BS / CS broadcast signal is supplied or cut off by the power supply voltage supplied to the V-ONU 10, so that two types of receiving devices are prepared. It is no longer necessary, and it is possible to select whether or not to watch BS / CS broadcasting according to the contract status of the subscriber without increasing the manufacturing cost.

Further, in the second embodiment, since the possibility of viewing the BS / CS broadcast is selected by switching the power supply voltage that cannot be seen by the subscriber, the uncontracted subscriber illegally watches the BS / CS broadcast. Can be prevented. Further, in the second embodiment, the SPDT SW43 is provided so that if the subscriber does not have a BS / CS broadcasting contract, a terminating resistor (not shown) is selected, so that impedance mismatch occurs. Can be prevented.

(E) Description of Configuration of Third Embodiment Next, a third embodiment of the present invention will be described. In the third embodiment, the V-ONU 10 has the same configuration as that of FIG. 2 or 7, and the power supply circuit 50 has the same configuration as the conventional example shown in FIG. 5, but the power supply circuit 50 and the V-ONU 10 are connected. The structure of the coaxial cable 4 is different. Other configurations are the same as those in FIGS. 2 and 5 (or 7).

FIG. 8A is a diagram showing a configuration example of the coaxial cable 4 according to the third embodiment. In the third embodiment, the step-down / step-up circuit 400 is added to the inner conductor of the coaxial cable. The step-down / step-up circuit 400 has a function of stepping down or stepping up the voltage of the power supply power output from the power supply circuit 50 and supplying it to the V-ONU 10.

FIG. 8B shows a more detailed configuration example. In the example of FIG. 8B, the capacitor 401 and the diode 402 are connected in parallel. Further, FIG. 8C also shows a more detailed configuration example. In the example of FIG. 8C, the capacitor 401 and the resistor 403 are connected in parallel.

(F) Description of Operation of Third Embodiment Next, the operation of the third embodiment of the present invention will be described. In the third embodiment, the coaxial cable 4 shown in FIG. 8 (B) or FIG. 8 (C) is provided to the subscriber who has concluded the viewing contract for BS / CS broadcasting, and is arranged at the subscriber's home. The power supply circuit 50 and the V-ONU 10 are connected by the coaxial cable 4 shown in FIG. 8 (B) or FIG. 8 (C). On the other hand, a normal coaxial cable (coaxial cable without a step-down / step-up circuit 400) is provided to a subscriber who has not concluded a viewing contract for BS / CS broadcasting, and a power supply circuit is arranged at the subscriber's house. The 50 and the V-ONU 10 are connected by a normal coaxial cable 4.

At this time, the power supply voltage supplied to the V-ONU 10 is different between the normal coaxial cable 4 and the coaxial cable 4 having the step-down / step-up circuit 400. Such a power supply voltage is detected by the detection unit 41 and supplied to the BS / CS control unit 42.

The BS / CS control unit 42 identifies whether the power supply voltage detected by the detection unit 41 is a normal voltage or a voltage stepped down or boosted by the step-down / step-up circuit 400, and determines whether the power supply voltage is a normal voltage. If this is the case, the operations of the amplifiers 23 and 24 are stopped (in the case of FIG. 7, the SPDT SW43 is switched to the termination resistance side). As a result, the BS / CS broadcast signal is not supplied to the television receiver, so that the subscriber cannot watch the BS / CS broadcast.

Further, when the voltage is stepped down or boosted, the amplifiers 23 and 24 are operated (in the case of FIG. 7, the SPDT SW43 is switched to the amplifier 23 side). As a result, the BS / CS broadcast signal is supplied to the television receiver, so that the subscriber can watch the BS / CS broadcast.

That is, in the third embodiment, as shown in FIG. 9, when the voltage step-down circuit is attached, not only the CATV broadcast but also the BS / CS broadcast can be viewed. On the other hand, when the voltage step-down circuit is not installed, only CATV broadcasting can be viewed, and BS / CS broadcasting cannot be viewed. The BS / CS broadcast viewing with and without the step-down / booster circuit may be reversed as shown in FIG.

As described above, according to the third embodiment of the present invention, by exchanging the coaxial cable 4, it is possible to select whether or not to watch the BS / CS broadcast. Therefore, two types of receiving devices are prepared. It is no longer necessary, and it is possible to select whether or not to watch BS / CS broadcasting according to the contract status of the subscriber without increasing the manufacturing cost.

Further, in the third embodiment, the step-down / step-up circuit 400 is composed of chip parts and built into the coaxial cable 4, so that the subscriber cannot see the circuit. According to such a method, it is possible to prevent an uncontracted subscriber from illegally watching a BS / CS broadcast by selecting whether or not to watch the BS / CS broadcast with a component that the subscriber cannot see. Further, when the BS / CS broadcast is set to be viewable when the pressure is lowered, for example, it is possible to prevent the coaxial cable 4 from becoming unviewable due to an increase in resistance due to aged deterioration.

(G) Description of Configuration of Fourth Embodiment Next, a fourth embodiment of the present invention will be described. In the fourth embodiment, the V-ONU 10 has the same configuration as that of FIG. 2 or 7, and the power supply circuit 50 has the same configuration as the conventional example shown in FIG. 5, but the power supply circuit 50 and the V-ONU 10 are connected. The structure of the power supply line 3 is different. Other configurations are the same as those in FIGS. 2 and 5 (or 7).

FIG. 10A is a diagram showing a configuration example of the power supply line 3 in the fourth embodiment. In the fourth embodiment, the power supply line 3 is provided with a step-down / step-up circuit 300 in a part of the conductor. The step-down / step-up circuit 300 has a function of stepping down or stepping up the voltage of the power supply power output from the power supply circuit 50 and supplying it to the V-ONU 10.

FIG. 10B shows a more detailed configuration example. In the example of FIG. 10B, the diode 301 is inserted in the middle of the power supply line 3. Further, FIG. 10C also shows a more detailed configuration example. In the example of FIG. 10C, the resistor 302 is inserted in the middle of the power supply line 3.

(H) Description of Operation of Fourth Embodiment Since the operation of the fourth embodiment is the same as that of the third embodiment, the description of the operation will be omitted.

As described above, according to the fourth embodiment of the present invention, it is possible to select whether or not to watch the BS / CS broadcast by exchanging the power supply line 3, so that two types of receiving devices are prepared. It is no longer necessary, and it is possible to select whether or not to watch BS / CS broadcasting according to the contract status of the subscriber without increasing the manufacturing cost.

Further, in the fourth embodiment, the step-down / step-up circuit 300 is composed of chip parts and built into the power supply line 3, so that the subscriber cannot see the circuit. According to such a method, it is possible to prevent an uncontracted subscriber from illegally watching a BS / CS broadcast by selecting whether or not to watch the BS / CS broadcast with a component that the subscriber cannot see. Further, when the BS / CS broadcast is set to be viewable when the pressure is lowered, for example, it is possible to prevent the power supply line 3 from becoming unviewable due to an increase in resistance due to aged deterioration.

(I) Description of the Configuration of the Fifth Embodiment Next, the fifth embodiment of the present invention will be described. FIG. 11 is a diagram showing a configuration example of a fifth embodiment of the present invention. In FIG. 11, the same reference numerals are given to the portions corresponding to those in FIG. 2, and the description thereof will be omitted. In FIG. 11, as compared with FIG. 2, a VCF (Voltage Controlled Filter) 44 is added after the HPF 27 and the LPF 28. Further, the BS / CS control unit 42 is configured to control the VCF 44 instead of the amplifiers 23 and 24. The configuration other than these is the same as in the case of FIG.

Here, the VCF 44 is an LPF controlled by the BS / CS control unit 42 and capable of changing the cutoff frequency fc. More specifically, the cutoff frequency fc can be selected from the upper limit frequency of the CATV broadcast signal (for example, 770 MHz) or the upper limit frequency of the BS / CS broadcast signal (for example, 3224 MHz). The band of the BC / CS broadcast signal may be further divided and selected.

(J) Description of Operation of Fifth Embodiment Next, the operation of the fifth embodiment of the present invention will be described. When the subscriber has a viewing contract for BS / CS broadcasting, a voltage of 11 V or less (for example, 10 V) is output from the AVR 54. The DC voltage output from the AVR 54 is supplied to the RF output terminal 33 of the V-ONU 10 via the RF input terminal 58.

The detection unit 41 detects the voltage of the power supply power supplied from the RF output terminal 33 and notifies the BS / CS control unit 42. The BS / CS control unit 42 controls the VCF 44 based on the voltage detected by the detection unit 41. That is, when the power supply voltage is 11 V or less, the BS / CS control unit 42 sets the cutoff frequency fc of the VCF 44 to the upper limit frequency (for example, 3224 MHz) of the BS / CS broadcast signal.

In the example of FIG. 11, regardless of the contents of the contract, the BS / CS broadcast signal amplified by the amplifiers 23 and 24 is output from the HPF 27, so that the cutoff frequency fc of the VCF 44 is the BS / CS broadcast signal. When the upper limit frequency is set, the VCF 44 outputs a signal including a CATV broadcast signal and a BS / CS broadcast signal. As a result, the subscriber can watch not only CATV broadcasting but also BS / CS broadcasting.

On the other hand, if the subscriber does not have a viewing contract for BS / CS broadcasting, the AVR 54 outputs a voltage exceeding 11V (for example, 15V). The DC voltage output from the AVR 54 is supplied to the RF output terminal 33 of the V-ONU 10 via the RF input terminal 58.

The detection unit 41 detects the voltage of the power supply power supplied from the RF output terminal 33 and notifies the BS / CS control unit 42. The BS / CS control unit 42 controls the VCF 44 based on the voltage detected by the detection unit 41. That is, when the power supply voltage exceeds 11 V, the BS / CS control unit 42 sets the cutoff frequency fc of the VCF 44 to the upper limit frequency (for example, 770 MHz) of the CATV broadcast signal.

When the cutoff frequency fc of the BS / CS control unit 42 is set to the upper limit frequency of the CATV broadcast signal, the VCF 44 outputs a signal including only the CATV broadcast signal. As a result, the subscriber can only watch the CATV broadcast.

That is, in the fifth embodiment, as shown in FIG. 12, when the cutoff frequency fc of the VCF44 is set to a frequency higher than the upper limit frequency of the BS / CS band, not only the CATV broadcasting but also the BS / CS Broadcasts will also be available for viewing. On the other hand, when the cutoff frequency fc of the VCF44 is set to a frequency higher than the upper limit frequency of the CATV band, only the CATV broadcast can be viewed, and the BS / CS broadcast cannot be viewed.

As described above, according to the fifth embodiment of the present invention, it is possible to select whether or not to watch the BS / CS broadcast by adjusting the power supply voltage, so that it is necessary to prepare two types of receiving devices. It is possible to select whether or not to watch BS / CS broadcasting according to the contract status of the subscriber without increasing the manufacturing cost.

Further, in the fifth embodiment, since the possibility of viewing the BS / CS broadcast is selected by switching the power supply voltage that the subscriber cannot see, the uncontracted subscriber illegally watches the BS / CS broadcast. Can be prevented.

(K) Description of the configuration of the sixth embodiment Next, the sixth embodiment of the present invention will be described. In the sixth embodiment, the VCF 44 shown in FIG. 11 has the configuration shown in FIG. Other configurations are the same as in FIG.

The example of FIG. 13 is composed of switches 441, 444, LPF442, and connection line 443. The switches 441 and 444 are controlled by the BS / CS control unit 42, and select either the LPF442 or the connection line 443. The LPF442 is a filter having a cutoff frequency fc as the upper limit frequency of the CATV broadcast signal. The connecting line 443 is a connecting line having good high frequency characteristics.

(L) Description of Operation of Sixth Embodiment Next, the operation of the sixth embodiment of the present invention will be described. When the subscriber has a viewing contract for BS / CS broadcasting, a voltage of 11 V or less (for example, 10 V) is output from the AVR 54. The DC voltage output from the AVR 54 is supplied to the RF output terminal 33 of the V-ONU 10 via the RF input terminal 58.

The detection unit 41 detects the voltage of the power supply power supplied from the RF output terminal 33 and notifies the BS / CS control unit 42. The BS / CS control unit 42 controls the switches 441 and 444 based on the voltage detected by the detection unit 41. That is, the switches 441 and 444 are made to select the connection line 443.

In the example of FIG. 11, regardless of the contents of the contract, since the BS / CS broadcast signal amplified by the amplifiers 23 and 24 is output from the HPF 27, the switches 441 and 444 connect the connection line 443 with good high frequency characteristics. When selected, the switch 444 outputs a signal including a CATV broadcast signal and a BS / CS broadcast signal. As a result, the subscriber can watch not only CATV broadcasting but also BS / CS broadcasting.

On the other hand, if the subscriber does not have a viewing contract for BS / CS broadcasting, the AVR 54 outputs a voltage exceeding 11V (for example, 15V). The DC voltage output from the AVR 54 is supplied to the RF output terminal 33 of the V-ONU 10 via the RF input terminal 58.

The detection unit 41 detects the voltage of the power supply power supplied from the RF output terminal 33 and notifies the BS / CS control unit 42. The BS / CS control unit 42 controls the switches 441 and 444 based on the voltage detected by the detection unit 41. That is, the switches 441 and 444 are made to select LPF442.

When LPF442 whose cutoff frequency fc is the upper limit frequency of the CATV broadcast signal is selected by the switches 441 and 444, a signal including only the CATV broadcast signal is output from the switch 444. As a result, the subscriber can only watch the CATV broadcast.

That is, in the sixth embodiment, as shown in FIG. 14, when the connection line 443 is selected by the switches 441 and 444, not only the CATV broadcast but also the BS / CS broadcast can be viewed. On the other hand, when LPF442 is selected by the switches 441 and 444, only the CATV broadcast can be viewed, and the BS / CS broadcast cannot be viewed.

As described above, according to the sixth embodiment of the present invention, it is possible to select whether or not to watch the BS / CS broadcast by adjusting the power supply voltage, so that it is necessary to prepare two types of receiving devices. It is possible to select whether or not to watch BS / CS broadcasting according to the contract status of the subscriber without increasing the manufacturing cost.

Further, in the sixth embodiment, since the possibility of viewing the BS / CS broadcast is selected by switching the power supply voltage that the subscriber cannot see, the uncontracted subscriber illegally watches the BS / CS broadcast. Can be prevented.

(M) Description of the Configuration of the Seventh Embodiment Next, the seventh embodiment of the present invention will be described. FIG. 15 is a diagram showing a configuration example of a seventh embodiment of the present invention. In FIG. 15, the same reference numerals are given to the portions corresponding to those in FIG. 4, and the description thereof will be omitted. In FIG. 15, as compared with FIG. 4, the amplifiers 23 and 24 are modularized BS / CS amplification units 46, and are detachable. Further, SPDT SW45 is added to the front stage of the amplifiers 23 and 24, and SPDT SW47 is added to the rear stage. The configuration other than these is the same as in FIG. In the seventh embodiment, the power supply circuit 50 has the same configuration as the conventional one shown in FIG.

(N) Description of Operation of Seventh Embodiment Next, the operation of the seventh embodiment of the present invention will be described. When the subscriber has a viewing contract for BS / CS broadcasting, the BS / CS amplification unit 46 is installed, and the SPDT SW45 and 47 have the BS / CS amplification unit 46 selected. Set to and provided to subscribers. As a result, the BS / CS broadcast signal output from the HPF21 is amplified by the amplifiers 23 and 24 and then output via the SPDT SW47 and the HPF27, so that the subscriber can not only broadcast the CATV but also the BS / CS. You can watch the broadcast.

On the other hand, if the subscriber does not have a viewing contract for BS / CS broadcasting, the BS / CS amplification unit 46 is removed, and SPDT SW45, 47 is set to select a terminating resistor (not shown) to subscribe. Provided to the person. As a result, the BS / CS broadcast signal output from the HPF 21 is terminated by the terminating resistor, so that the subscriber can watch the CATV broadcast but cannot watch the BS / CS broadcast.

That is, in the seventh embodiment, as shown in FIG. 16, when the BS / CS amplification unit 46 is attached, not only the CATV broadcast but also the BS / CS broadcast can be viewed. On the other hand, when the BS / CS amplification unit 46 is removed, only the CATV broadcast can be viewed, and the BS / CS broadcast cannot be viewed.

As described above, according to the seventh embodiment of the present invention, by attaching / detaching the BS / CS amplification unit 46, it is possible to select whether or not to watch the BS / CS broadcast. It is not necessary to prepare the type, and it is possible to select whether or not to watch the BS / CS broadcast according to the contract status of the subscriber without increasing the manufacturing cost.

Further, in the seventh embodiment, when the BS / CS amplification unit 46 is not attached, the BS / CS broadcast cannot be viewed, so that an uncontracted subscriber illegally watches the BS / CS broadcast. Can be prevented.

(O) Description of the configuration of the eighth embodiment Next, the eighth embodiment of the present invention will be described. FIG. 17 is a diagram showing a configuration example of an eighth embodiment of the present invention. In FIG. 17, the same reference numerals are given to the portions corresponding to those in FIG. 4, and the description thereof will be omitted. In FIG. 17, a detachable LPF48 is added after the HPF27 and the LPF28 as compared with FIG.4. Other configurations are the same as in FIG. In the seventh embodiment, the power supply circuit 50 has the same configuration as the conventional one shown in FIG.

Here, LPF48 has the same characteristics as LPF442 shown in FIG. That is, the LPF48 is a filter whose cutoff frequency is the upper limit frequency of the CATV broadcast signal.

(P) Description of Operation of Eighth Embodiment Next, the operation of the eighth embodiment of the present invention will be described. When the subscriber has a viewing contract for BS / CS broadcasting, the LPF48 is removed, and the receiver 1 in which the HPF27 and LPF28 and the turnout 29 are directly connected is provided to the subscriber. .. As a result, the BS / CS broadcast signal output from the HPF 21 is amplified by the amplifiers 23 and 24 and then output via the HPF 27, so that the subscriber can watch not only the CATV broadcast but also the BS / CS broadcast. can do.

On the other hand, when the subscriber does not have a viewing contract for BS / CS broadcasting, the receiving device 1 in which the LPF48 is attached is provided to the subscriber. As a result, the BS / CS broadcast signal output from the HPF 27 is attenuated by the LPF 48, so that the subscriber can watch the CATV broadcast but cannot watch the BS / CS broadcast.

That is, in the eighth embodiment, as shown in FIG. 18, when the LPF48 is not attached, not only the CATV broadcast but also the BS / CS broadcast can be viewed. On the other hand, when the LPF48 is attached, only the CATV broadcast can be viewed, and the BS / CS broadcast cannot be viewed.

As described above, according to the eighth embodiment of the present invention, it is possible to select whether or not to watch the BS / CS broadcast depending on whether or not the LPF48 is attached. Therefore, it is necessary to prepare two types of receiving devices. It is possible to select whether or not to watch BS / CS broadcasting according to the contract status of the subscriber without increasing the manufacturing cost.

Further, in the eighth embodiment, when the HPF27 and LPF28 and the turnout 29 are not directly connected, the BS / CS broadcast cannot be viewed, so that an uncontracted subscriber illegally uses the BS / CS broadcast. It is possible to prevent viewing.

(Q) Description of Modified Embodiments It goes without saying that each of the above embodiments is an example, and the present invention is not limited to the cases described above. For example, in the example shown in FIG. 2, both the amplifiers 23 and 24 are controlled, but only one of these may be controlled.

Further, the voltage switching unit 541 shown in FIG. 3 is designed to switch the voltage by manual operation, for example, but for example, a signal supplied from the outside (for example, an electric signal, an electromagnetic wave signal, an infrared (ultraviolet) line signal, etc.). The voltage may be changed by an ultrasonic signal or the like). At that time, the legitimacy may be confirmed by a predetermined password or the like to prevent an unauthorized change in voltage. The voltage switching operation may be performed by either a CATV operator or a subscriber.

Further, it may be possible to notify the outside which voltage is set or to display the operating status.

Further, in the example shown in FIG. 7, the terminating resistor or the amplifier 23 is selected by the SPDT SW43 arranged in the front stage of the amplifier 23, but it is arranged in the rear stage of the amplifier 24 or between the amplifier 23 and the amplifier 24. May be good.

Further, the circuits shown in FIGS. 8 and 10 are examples, and circuits other than these may be used.

Further, in the example shown in FIG. 11, the VCF 44 is provided after the HPF 27 and the LPF 28, but may be provided between the AGC 19 and the HPF 21 and the LPF 22, for example.

Further, in the example shown in FIG. 15, both the amplifiers 23 and 24 are detachable, but either one of the amplifiers 23 and 24 may be detachable. Further, SPDT SW47 may be excluded.

Further, in the example of FIG. 17, the LPF48 is provided after the HPF27 and the LPF28, but may be provided between the AGC19 and the HPF21 and the LPF22, for example.

Further, in each of the above embodiments, satellite broadcasting signals such as BS / CS broadcasting signals are blocked, but an attenuator or the like may be used to attenuate the signals to a signal level that cannot be reproduced by the television receiver. ..

Further, the selection of whether the BS / CS broadcast signal or the like, which has been described in the operation of each embodiment, can be viewed or cannot be viewed may be reversed.

1 Receiver 2 Optical fiber 3 Power line 4 Coaxial cable 10V-ONU
11 O / E
23, 24 Amplifier 41 Detection unit 42 BS / CS control unit 50 Power supply circuit 54 AVR
300,400 Step-down / step-up circuit 541 Voltage switching unit

Claims (4)

In a receiving device that receives a CATV broadcast signal and an optical signal including a satellite broadcast signal in a frequency band higher than the CATV broadcast signal, converts it into an electric signal, and outputs the signal.
A first power supply voltage is supplied from the power supply circuit to the receiving device, or a second power supply voltage having a voltage lower than the first power supply voltage is supplied from the power supply circuit to the receiving device, and the first power supply voltage and the first power supply voltage are supplied . 2 Detection means for detecting one of the power supply voltages and
A conversion means for converting the optical signal including the CATV broadcast signal and the satellite broadcast signal into the electric signal, and
When the detection means detects the first power supply voltage, the attenuation means for attenuating the satellite broadcast signal among the CATV broadcast signal and the satellite broadcast signal included in the electric signal obtained by the conversion means. When,
A receiving device characterized by having. The receiving device according to claim 1, wherein the attenuation means attenuates the satellite broadcast signal by changing the operation of a processing circuit that processes the satellite broadcast signal. The receiving device according to claim 2, wherein the attenuating means attenuates the satellite broadcasting signal by stopping the operation of an amplifier having the processing circuit for amplifying the satellite broadcasting signal. The receiving device according to claim 2, wherein the attenuation means attenuates the satellite broadcast signal by changing the cutoff frequency of the low-pass filter included in the processing circuit.

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