JP5856270B2 - Notification broadcast receiver - Google Patents

Description

  The present invention relates to an announcement broadcast receiver that constitutes an optical reception system for receiving an optical signal in an optical transmission system.

  In recent years, with the progress of optical communication technology, optical transmission systems using optical cables have become widespread. According to this optical transmission system, relayless transmission of about several tens of kilometers can be performed, so that the transmission system can be easily widened. As schematically shown in the block diagram of FIG. 5, this optical transmission system includes an optical transmitter 200 and an optical amplifier 201 arranged on the sender side, and an optical receiver (optical termination terminal) arranged on the receiver side. An apparatus, ONU (Optical Network Unit) 202, is connected via a long-distance transmission path constituted by an optical cable 203. Then, the TV signal and the announcement broadcast signal are mixed, the mixed electric signal is converted into an optical signal by the optical transmitter 200, the optical signal is amplified by the optical amplifier 201, and then transmitted through the optical cable 203. . The optical receiver 202 receives this optical signal, converts it into an RF signal or FM signal, and outputs it to the TV receiver 204 or the notification broadcast receiver 205.

  Here, when the optical receiver 202 is a type of optical receiver that operates by receiving power supply when there is no power failure and stops operation during a power failure (hereinafter referred to as a power-feed type optical receiver), a power inserter ( The power is supplied to the optical receiver 202 using a power supply device. FIG. 6 shows a block diagram of an optical reception system using such a feed type optical receiver. As shown in FIG. 6, a power inserter 206 is arranged between the optical receiver 202 and the TV receiver 204, and DC power is supplied from a commercial power source to the power inserter 206 via the AC adapter 207. The direct current power was supplied from 206 to the optical receiver 202. Further, as shown in FIG. 6, power to the notification broadcast receiver 205 was supplied from a commercial power supply via the AC adapter 208 (for example, Patent Document 1 discloses a notification broadcast receiver). Patent Document 2 discloses a power-feed type optical receiver).

  On the other hand, the optical receiver 202 is a type of optical receiver that operates by receiving power supply when there is no power outage and can operate without power supply during a power outage (hereinafter referred to as a non-powered optical receiver). Even in this case, power is supplied to the optical receiver 202 using a power inserter. FIG. 7 shows a block diagram of an optical receiving system using such a parasitic optical receiver. As shown in FIG. 7, a power inserter 206 is disposed between the optical receiver 202 and the TV receiver 204, and DC power is supplied from a commercial power source to the power inserter 206 via the AC adapter 207. The direct current power was supplied from 206 to the optical receiver 202. In the parasitic optical receiver 202, the RF signal is divided into a TV signal and an FM signal, the TV signal is supplied to the TV receiver 204, and the FM signal is supplied to the notification broadcast receiver 205. Further, as shown in FIG. 7, the power to the notification broadcast receiver 205 is supplied from a commercial power source via the AC adapter 208.

JP 2006-121729 A JP 2007-31282 A

  However, as shown in FIG. 6, in an optical reception system configured to include a feed-type optical receiver and an announcement broadcast receiver, a power inserter and a power inserter are provided to supply power to the optical receiver. An AC adapter that supplies power was required. Further, since a backup power supply is usually provided in the notification broadcast receiver at the time of a power failure, the notification broadcast receiver can continuously perform an emergency broadcast or the like with the electric power supplied from the backup power supply. However, in the event of a power failure, the power supply to the optical receiver that is performed via the AC adapter and the power inserter is also stopped, so the optical receiver becomes inoperable, and the RF signal is not supplied from the optical receiver to the notification broadcast receiver. I couldn't do it, and I couldn't actually continue the emergency broadcast. Alternatively, in order to actually continue emergency broadcasting or the like, it is necessary to provide a backup power source for the optical receiver.

  In addition, as shown in FIG. 7, even in an optical reception system configured to include a non-feed-type optical receiver and an announcement broadcast receiver, a power inserter and the power inserter are used to supply power to the optical receiver. Needed an AC adapter to supply power.

  The present invention has been made in view of the above, and an object thereof is to provide a notification broadcast receiver in which a power inserter and an AC adapter for supplying power to an optical receiver can be omitted.

  In order to solve the above-described problems and achieve the object, the notification broadcast receiver according to claim 1 is connected to an optical receiver that converts an optical signal transmitted through an optical transmission path into an electrical signal, An announcement broadcast receiver for performing announcement broadcast using an electrical signal converted by the optical receiver, capable of supplying electric power of the optical receiver, and an announcement broadcast input from the optical receiver as the electrical signal Broadcast control signal acquisition means for acquiring a broadcast control signal superimposed on the signal, and for broadcast control for supplying or cutting off power to the optical receiver based on the broadcast control signal acquired by the broadcast control signal acquisition means A power shut-off means.

  The notification broadcast receiver according to claim 2 is the notification broadcast receiver according to claim 1, further comprising an input terminal for receiving an input of the electric signal from the optical receiver, and the optical receiver from the input terminal. To supply power.

  The notification broadcast receiver according to claim 3 is the notification broadcast receiver according to claim 1 or 2, wherein power supplied from the outside of the notification broadcast receiver is converted into required power in the notification broadcast receiver. A power supply circuit that supplies power supplied from outside the notification broadcast receiver to the optical receiver via the power supply circuit.

  The announcement broadcast receiver according to claim 4 is the announcement broadcast receiver according to claim 3, wherein the announcement broadcast receiver stops supplying power to the announcement broadcast receiver from the outside of the announcement broadcast receiver. A backup power source serving as a power source in the case of being performed, and the power supplied from the backup power source can be supplied to the optical receiver via the power supply circuit.

  The notification broadcast receiver according to claim 5 is the notification broadcast receiver according to any one of claims 1 to 4, wherein power supply to the notification broadcast receiver from the outside of the notification broadcast receiver is stopped. Power supply stop detection means for detecting the power supply to the optical receiver when the stop of power supply to the notification broadcast receiver from the outside of the notification broadcast receiver is not detected by the power supply stop detection means. Supplying power and shutting off the power to the optical receiver when the power supply stop detection means detects the stop of power supply to the notification broadcast receiver from the outside of the notification broadcast receiver; And a power cut-off means for power failure.

  Thus, according to the notification broadcast receiver of claim 1, since the power of the optical receiver can be supplied from the notification broadcast receiver, the power inserter and the AC adapter for supplying power to the optical receiver are provided. Thus, the optical receiving system can be configured easily and inexpensively. Also, since the broadcast control signal acquisition means for acquiring the broadcast control signal and the broadcast control power supply cutoff means for supplying or cutting off the power to the optical receiver based on the broadcast control signal are provided, the optical receiver is so-called It becomes possible to use it as an addressable ONU, and it is possible to remotely control blocking and restoration of TV broadcasting.

  According to the notification broadcast receiver of claim 2, power is supplied from the notification broadcast receiver to the optical receiver via a transmission path for transmitting an electrical signal from the optical receiver to the notification broadcast receiver. Therefore, just by connecting the optical receiver and the notification broadcast receiver in the same manner as in the past, the power of the optical receiver can be supplied from the notification broadcast receiver, and it is not necessary to provide a special path for power supply. The optical receiving system can be configured more simply and inexpensively.

  According to the notification broadcast receiver of claim 3, since power is supplied to the optical receiver via the power supply circuit of the notification broadcast receiver, the circuit voltage of the optical receiver and the circuit voltage of the notification broadcast receiver are supplied. Are identical to each other, it is not necessary to provide a power supply circuit in the optical receiver, and the optical receiving system and the optical receiver can be configured more simply and inexpensively.

  Moreover, according to the notification broadcast receiver of claim 4, since the power supplied from the backup power source of the notification broadcast receiver can be supplied to the optical receiver, the notification broadcast receiver can be used even when there is no power supply. In addition, the optical receiver can be operated, and emergency notification broadcasting can be reliably performed even during a power failure.

  According to the notification broadcast receiver of claim 5, the power supply stop detection means for detecting the stop of the power supply to the notification broadcast receiver, and the notification broadcast receiver from the outside of the notification broadcast receiver. When the power supply stop is not detected by the power supply stop detection means, the power is supplied to the optical receiver, and the power supply to the notification broadcast receiver is stopped from the outside of the notification broadcast receiver. When the power supply stop detection means is detected, the power supply to the notification receiver is stopped because it includes a power cut-off power cutoff means that cuts off the power to the optical receiver. In some cases, the power supply from the notification broadcast receiver to the optical receiver can be cut off, and the power from the backup power source of the notification broadcast receiver is not consumed by the optical receiver. Time It is possible to continue.

It is a block diagram of the optical receiving system which concerns on Embodiment 1 of this invention. 3 is a configuration diagram of an optical reception system according to Embodiment 2. FIG. 6 is a configuration diagram of an optical reception system according to Embodiment 3. FIG. FIG. 10 is a configuration diagram of an optical reception system according to a fourth embodiment. It is a block diagram of the conventional optical transmission system. It is a block diagram of the conventional optical receiving system using a feed type optical receiver. It is a block diagram of the conventional optical receiving system using a parasitic power type optical receiver.

  Hereinafter, embodiments of a notification broadcast receiver according to the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited by these embodiments.

[Embodiment 1]
First, the first embodiment will be described. In the first embodiment, power is supplied from a notification broadcast receiver to a power feeding type optical receiver.

(Constitution)
FIG. 1 is a configuration diagram of an optical receiving system according to the first embodiment. As shown in FIG. 1, an optical receiver system 1 includes an optical receiver 10, an announcement broadcast receiver 20 and a plurality of TV receivers 30 via a distributor 40 and a coaxial cable (transmission path) 50. It is configured to be connected as follows. An AC adapter 60 is connected to the notification broadcast receiver 20. Note that the TV receiver 30, the distributor 40, and the coaxial cable 50 can be configured in the same manner as known ones, and thus description thereof is omitted. However, since the power supply to the optical receiver 10 is performed from the notification broadcast receiver 20, it is provided between the TV receiver 30 and the optical receiver 10 in order to supply power to the optical receiver 10. A power inserter and an AC adapter for supplying power to the power inserter are omitted.

(Configuration-optical receiver)
The optical receiver 10 is a feed-type optical receiver, and is connected to an optical transmission path (not shown). On the upstream side of this optical transmission line, a TV signal and a notification broadcast signal input from an input device (not shown) such as a head end device are mixed, and the mixed electric signal is converted into an optical signal and input to the optical transmission line. The This optical signal is transmitted through the optical transmission path and input to the optical receiver 10. The optical receiver 10 is an optical terminal unit (ONU), and includes a PD (Photo Diode), an amplifier, and an output terminal (these parts are not shown in the figure). Hereinafter, the signal is converted into an RF signal in this embodiment, and the RF signal is amplified by an amplifier and output to an output terminal. Here, since the power supply to the optical receiver 10 is performed via the power supply circuit 22 of the notification broadcast receiver 20 described later, the circuit voltage of the optical receiver 10 and the circuit voltage of the notification broadcast receiver 20 are mutually. , The power supply circuit of the optical receiver 10 can be omitted. However, if there is a possibility that the received voltage of the optical receiver 10 may become unstable due to the distance between the optical receiver 10 and the notification broadcast receiver 20 being separated, the optical receiver 10 A power supply circuit similar to the conventional one may be provided. Since the configuration of the other optical receiver 10 is the same as the configuration of a known optical receiver, detailed description thereof is omitted.

(Configuration-Notification broadcast receiver)
The notification broadcast receiver 20 receives and outputs a notification broadcast. The notification broadcast receiver 20 is configured by connecting an input terminal 21, a power supply circuit 22, a backup power supply 23, a detection unit 24, a speaker 25, a control unit 26, a coil 27, and a capacitor 28 as illustrated. The input terminal 21 is a terminal that receives an RF signal input from the optical receiver 10. The detector 24 is a notification broadcast signal acquisition unit that acquires a notification broadcast signal from the RF signal input to the input terminal 21. The speaker 25 is an audio output unit that outputs an announcement broadcast signal acquired by the detection unit 24 based on the control of the control unit 26. The power supply circuit 22 converts the power supplied from the outside of the notification broadcast receiver 20 (here, the power supplied from the AC adapter 60) into the required power in the notification broadcast receiver 20, and the notification broadcast receiver. 20 is a power conversion unit that supplies power to each unit. The backup power source 23 is connected to the notification broadcast receiver 20 via the power supply circuit 22 when the power supply to the notification broadcast receiver 20 is stopped from the outside of the notification broadcast receiver 20 (here, from the AC adapter 60). It is a power source that supplies power to each part. Here, the backup power source 23 includes a secondary battery (not shown) that can be charged with DC power supplied from the AC adapter 60. The control unit 26 is a control unit that controls each unit of the notification broadcast receiver 20. The coil 27 is a high-frequency cutoff means that blocks high-frequency components and allows direct current components to pass through. The capacitor 28 is DC blocking means that blocks the DC component and passes only the AC component.

(Operation-during power supply)
In the optical reception system 1 configured as described above, when power is supplied from the AC adapter 60 (hereinafter referred to as power supply), AC power acquired by the AC adapter 60 from a commercial power source is converted to the AC adapter. The power is converted to DC power at 60 and supplied to the power supply circuit 22. This DC power is supplied to each part of the notification broadcast receiver 20 by the power supply circuit 22 so that the notification broadcast receiver 20 operates. The DC power is supplied from the power supply circuit 22 to the input terminal 21 via the coil, and is supplied from the input terminal 21 to the output terminal of the optical receiver 10 via the coaxial cable 50 and the distributor 40. The optical receiver 10 operates with the DC power supplied from the notification broadcast receiver 20 as in the conventional case where DC power is supplied from the power inserter.

  In such a power supply state, the RF signal converted by the optical receiver 10 is input to each TV receiver 30 via the coaxial cable 50 and the distributor 40, and the TV is received by each TV receiver 30. . The RF signal converted by the optical receiver 10 is input to the input terminal 21 of the notification broadcast receiver 20 through the coaxial cable 50 and the distributor 40, passes through the capacitor 28, and is input to the detection unit 24. The Then, the notification broadcast is performed from the speaker 25 by the notification broadcast signal acquired by the detection unit 24. In addition, when notification broadcast by the notification broadcast receiver 20 is not performed for a long period of time, the user may unintentionally or mistakenly unplug the AC adapter 60 from the outlet. According to this, when the AC adapter 60 is removed, power supply to the optical receiver 10 is stopped, and TV viewing on the TV receiver 30 becomes impossible, so that the AC adapter 60 is prevented from being intentionally removed. Motivation can be given, or the user can be made aware that the AC adapter 60 has been accidentally pulled out, so that the AC adapter 60 can be prevented from being pulled out and announcement broadcasting can be reliably performed. There is also an effect.

(Operation-no power supply)
On the other hand, when the power from the AC adapter 60 is not supplied due to a power failure or the like (hereinafter, when no power is supplied), the power of the backup power supply 23 is supplied to the power supply circuit 22, and the notification broadcast receiver 20 is supplied from the power supply circuit 22. The power is supplied to each part of the optical receiver 10 and the optical receiver 10 is supplied with power. Accordingly, as in the case of power feeding, the optical receiver 10 and the notification broadcast receiver 20 operate, and it is possible to perform an emergency notification broadcast from the notification broadcast receiver 20 even during a power failure.

(effect)
As described above, according to the first embodiment, since the power of the optical receiver 10 can be supplied from the notification broadcast receiver 20, a power inserter and an AC adapter for supplying power to the optical receiver 10 are omitted. Thus, the optical receiving system 1 can be configured easily and inexpensively.

  Further, since power is supplied from the notification broadcast receiver 20 to the optical receiver 10 via a transmission path for transmitting an electrical signal from the optical receiver 10 to the notification broadcast receiver 20, the optical receiver 10 and the notification broadcast are supplied. The power of the optical receiver 10 can be supplied from the notification broadcast receiver 20 only by connecting the receiver 20 in the same manner as in the past, and there is no need to provide a special path for supplying power. It becomes possible to configure simply and inexpensively.

  In addition, since power is supplied to the optical receiver 10 via the power supply circuit 22 of the notification broadcast receiver 20, the circuit voltage of the optical receiver 10 and the circuit voltage of the notification broadcast receiver 20 are the same. Therefore, it is not necessary to provide the optical receiver 10 with the power supply circuit 22, and the optical receiver system 1 and the optical receiver 10 can be configured more simply and inexpensively.

  In addition, since the power supplied from the backup power source 23 of the notification broadcast receiver 20 can be supplied to the optical receiver 10, the optical receiver 10 can be operated in addition to the notification broadcast receiver 20 even when there is no power supply. Therefore, it is possible to reliably perform emergency notification broadcasting even during a power failure.

[Embodiment 2]
Next, a second embodiment according to the present invention will be described in detail. In the second embodiment, power is supplied from a notification broadcast receiver to a non-powered optical receiver. However, components and operations not particularly described are the same as those in the first embodiment, and the same components and operations as those in the first embodiment are used in the first embodiment as necessary. The same reference numerals as those in FIG.

(Constitution)
FIG. 2 is a configuration diagram of an optical receiving system according to the second embodiment. As shown in FIG. 2, the optical receiver system 2 is configured by connecting an optical receiver 70, a notification broadcast receiver 80, and a TV receiver 30 via a coaxial cable 50 as shown in the figure. . Although only one TV receiver 30 is shown here, a plurality of TV receivers 30 may be connected via a distributor 40 as in the first embodiment (the embodiment described later). 3 and Embodiment 4).

(Configuration-optical receiver)
The optical receiver 70 is a parasitic optical receiver, and includes a PD 71, a short circuit 72, an amplifier 73, an RF signal output terminal 74, an FM signal output terminal 75, a power circuit 76, a capacitor 77, and coils 78 and 79. Are connected as shown in the figure. The PD 71 is a photoelectric conversion unit that converts an optical signal into an electric signal. The short-circuit path 72 is a short-circuit means for short-circuiting the PD 71 when no power is supplied, and includes a switch 72a. The amplifier 73 is connected to the anode side of the PD 71, amplifies the RF signal converted by the PD 71, and outputs it to the RF signal output terminal 74. The RF signal output terminal 74 outputs the RF signal amplified by the amplifier 73 to the TV receiver 30. The FM signal output terminal 75 outputs an FM signal acquired from the RF signal converted by the PD 71. The power supply circuit 76 is power conversion means that converts the power supplied from the notification broadcast receiver 80 into the required power in the optical receiver 70 and supplies it to each part of the optical receiver 70. The capacitor 77 is a DC blocking means that blocks the DC component and passes only the AC component. The coils 78 and 79 are high-frequency cutoff means that cut off high-frequency components and pass DC components and the like.

  The parasitic optical receiver 70 can be provided with known components in addition to the components shown in FIG. 2, and operates when the power is supplied from the notification broadcast receiver 80. When power is not supplied from the broadcast receiver 80, it operates without power supply. As a more specific configuration of such a non-feed-type optical receiver 70, for example, FIG. 1 of Japanese Patent Application Nos. 2009-157209 and 2009-157210 (not disclosed at the time of application) by the inventors of the present application. For example, the disclosed configuration can be adopted.

(Configuration-Notification broadcast receiver)
The notification broadcast receiver 80 is configured in substantially the same manner as the notification broadcast receiver 20 of the first embodiment, but the power from the AC adapter 60 is supplied to the power supply circuit 22 and the backup power supply 23, and further, The difference is that the power can be supplied directly to the input terminal 21 without going through the power supply circuit 22.

(Operation-during power supply)
In the optical receiver system 2 configured as described above, during power feeding, AC power acquired from a commercial power supply is converted into DC power by the AC adapter 60 and supplied to the power supply circuit 22, and this DC power is supplied to the power supply circuit. The notification broadcast receiver 80 is operated by being supplied to each part of the notification broadcast receiver 80 at 22. Further, the DC power converted by the AC adapter 60 is supplied to the input terminal 21 via the coil 27 without passing through the power supply circuit 22, and the FM of the optical receiver 70 from the input terminal 21 via the coaxial cable 50. The signal is supplied to the signal output terminal 75. In the optical receiver 70, the direct-current power supplied from the notification broadcast receiver 80 is supplied to each part of the optical receiver 70 via the power supply circuit 76, whereby the optical receiver 70 operates.

  In such a power supply state, in the optical receiver 70, the switch 72a of the short circuit 72 is opened and the PD 71 is in a non-short circuit state, and the reverse voltage supplied from the power supply circuit 76 is applied to the PD 71. An RF signal subjected to photoelectric conversion by the PD 71 is output. This RF signal is output from the RF signal output terminal 74. This RF signal is input to each TV receiver 30, and the TV is received by each TV receiver 30. In the optical receiver 70, the RF signal output from the PD 71 is input to an unillustrated FMBPF (FM Band Pass Filter) provided between the PD 71 and the FM signal output terminal 75, and the FM signal that has passed through this FMBPF. Is output from the FM signal output terminal 75. This FM signal is input to the input terminal 21 of the notification broadcast receiver 80, passes through the capacitor 28, and is input to the detection unit 24. Then, the notification broadcast is performed from the speaker 25 by the notification broadcast signal acquired by the detection unit 24.

(Operation-no power supply)
When no power is supplied, power from the backup power supply 23 is supplied to the power supply circuit 22, and power is supplied from the power supply circuit 22 to each part of the notification broadcast receiver 80. Accordingly, the notification broadcast receiver 80 operates in the same manner as during power feeding. Further, in the optical receiver 70, the switch 72a of the short circuit 72 is closed by a known method so that the PD 71 is in a short circuit state, and the PD 71 driven in the non-bias mode has a light higher than the energy band cap. When energy is incident, the light energy is absorbed by the depletion layer, and conduction electrons and holes are generated and drifted to generate an electromotive force proportional to the light intensity. The RF signal generated by this electromotive force passes through a FM BEF (FM Band Eliminate Filter) (not shown) connected in series to the switch 72a of the short circuit 72, so that only the FM signal becomes a non-short circuit state and has a voltage. , Output from the FM signal output terminal 75. Then, when this FM signal is input to the input terminal 21 of the notification broadcast receiver 80, notification broadcast is performed in the same manner as during power feeding. Accordingly, as in the case of power feeding, the optical receiver 70 and the notification broadcast receiver 80 operate, and an emergency notification broadcast can be performed from the notification broadcast receiver 80 even during a power failure.

(effect)
As described above, according to the second embodiment, in addition to the effects of the first embodiment, the optical receiver 70 is a non-feed-type optical receiver, and transmits the notification broadcast signal to the notification broadcast receiver 80. Since power is supplied from the notification broadcast receiver 80 to the optical receiver 70 via the coaxial cable 50, the optical receiver 70 can operate without power supply without receiving power supply from the notification broadcast receiver 80 when no power is supplied. In addition, since the power from the backup power source 23 of the notification broadcast receiver 80 is not consumed by the optical receiver 70, the notification broadcast can be continued for a longer time in the event of a power failure or the like.

[Embodiment 3]
Next, Embodiment 3 according to the present invention will be described in detail. In the third embodiment, power is supplied from a notification broadcast receiver to a non-powered optical receiver, and power is supplied to the optical receiver based on a broadcast control signal superimposed on the notification broadcast signal. Or it is the form which blocks. However, components and operations not particularly described are the same as those of the second embodiment, and the same components and operations as those of the second embodiment are used in the second embodiment as necessary. The same reference numerals as those in FIG.

(Constitution)
FIG. 3 is a configuration diagram of an optical receiving system according to the third embodiment. As shown in FIG. 3, the optical receiver system 3 is configured by connecting an optical receiver 70, an announcement broadcast receiver 90, and a TV receiver 30 via a coaxial cable 50 as shown in the figure. .

(Configuration-Notification broadcast receiver)
The notification broadcast receiver 90 is configured in substantially the same manner as the notification broadcast receiver 80 of the second embodiment. However, a switch 91 is provided on the power supply path from the AC adapter 60 to the input terminal 21. The detection unit 92 has a function as a broadcast control signal acquisition unit that acquires a broadcast control signal superimposed on the notification broadcast signal, in addition to the same function as the detection unit 24 of the second embodiment. In addition to the function similar to the control part 26 of Embodiment 2, 93 is a power supply cutoff for broadcast control which supplies or interrupts | blocks the electric power to the optical receiver 70 based on the broadcast control signal acquired in the detection part 92 It has a function as a means. That is, in the present embodiment, on the upstream side of the optical transmission line, a broadcast control signal is superimposed on the notification broadcast signal as necessary, and the notification broadcast receiver 90 to the optical receiver 70 are based on this broadcast control signal. By supplying or cutting off power to the optical receiver 70, the optical receiver 70 is operated as a so-called addressable ONU.

(Operation-during TV broadcast)
In the optical receiving system 3 configured as described above, the switch 91 is normally controlled to be in the closed state by the control unit 93, and the DC power converted by the AC adapter 60 at the time of power feeding as in the second embodiment. Thus, the notification broadcast receiver 90 and the optical receiver 70 operate. When no power is supplied, the notification broadcast receiver 90 is operated by DC power from the backup power source 23 and the optical receiver 70 operates without power supply.

(Operation-When power is supplied and when power is not supplied-When TV broadcast is cut off)
During such power supply and no power supply, the detection unit 92 always acquires the broadcast control signal superimposed on the notification broadcast signal and outputs the broadcast control signal to the control unit 93. The control unit 93 performs broadcast control from the detection unit 92. The output of the signal is constantly monitored, and when a broadcast control signal is output, the control command indicated by the broadcast control signal is analyzed by a known method. If the control command is a command for instructing to block TV broadcast, the control unit 93 controls the switch 91 to be in an open state. In this case, the notification broadcast receiver 90 continues to operate with the DC power from the AC adapter 60 or the backup power source 23, but the optical receiver 70 is cut off from the power supply from the notification broadcast receiver 90. Then, a non-feeding operation is performed, the output of the RF signal is stopped, and only the FM signal is output. Therefore, the TV receiver 30 cannot receive a TV image, and viewing is restricted. On the other hand, since the notification broadcast using the FM signal is continued, the emergency broadcast can be performed from the notification broadcast receiver 90.

(Operation-Power supply and no power supply-TV broadcast restoration)
Thereafter, similarly, acquisition of the broadcast control signal by the detection unit 92, monitoring of the broadcast control signal by the control unit 93 and analysis of the control command are continuously performed, and the control command is a command for instructing restoration of the TV broadcast. If it is, the control unit 93 controls the switch 91 to be closed. As a result, the TV image received by the TV receiver 30 and the notification broadcast by the notification broadcast receiver 90 can be performed as before the TV broadcast is interrupted. As described above, since the broadcast control signal superimposed on the FM signal can be continuously input to the notification broadcast receiver even when the TV broadcast is interrupted, it is possible to control the restoration of the TV broadcast.

(effect)
As described above, according to the third embodiment, in addition to the effects of the second embodiment, the detection unit 92 that acquires the broadcast control signal and the power to the optical receiver 70 based on the broadcast control signal are supplied or cut off. Since the optical receiver 70 can be operated as a so-called addressable ONU, it is possible to remotely control the interruption and restoration of TV broadcast.

[Embodiment 4]
Next, a fourth embodiment according to the present invention will be described in detail. In the fourth embodiment, power is supplied from a notification broadcast receiver to a non-powered optical receiver, and the stop of power supply to the notification broadcast receiver is detected. In this mode, power is supplied to or cut off from the receiver. However, components and operations not particularly described are the same as those of the third embodiment, and the same components and operations as those of the third embodiment are used in the third embodiment as necessary. The same reference numerals as those in FIG.

(Constitution)
FIG. 4 is a configuration diagram of an optical reception system according to the fourth embodiment. As shown in FIG. 4, the optical receiver system 4 is configured by connecting an optical receiver 100, an announcement broadcast receiver 110, and a TV receiver 30 via a coaxial cable 50 as shown in the figure. .

(Configuration-optical receiver)
The optical receiver 100 is configured in the same manner as in the third embodiment. However, power supply to the optical receiver 100 is performed via the power supply circuit 22 of the notification broadcast receiver 110, and here, the circuit voltage of the optical receiver 100 and the circuit voltage of the notification broadcast receiver 110 are mutually interchanged. Therefore, the power supply circuit of the optical receiver 100 is omitted. However, if there is a possibility that the received voltage of the optical receiver 100 may become unstable due to the distance between the optical receiver 100 and the notification broadcast receiver 110 being different from each other, Similarly, a power supply circuit 76 may be provided in the optical receiver 100.

(Configuration-Notification broadcast receiver)
The notification broadcast receiver 110 is configured in substantially the same manner as the notification broadcast receiver 90 of the third embodiment. However, the power supplied from the AC adapter 60 is supplied to the switch 91 via the power supply circuit 22. The notification broadcast receiver 110 is provided with a power failure detection unit (power supply stop detection unit) 111. The power failure detection unit 111 is power supply stop detection means for detecting a stop of power supply to the notification broadcast receiver 110 from the outside of the notification broadcast receiver 110 (here, from the AC adapter 60). By detecting the current value in the line from 60 to the power supply circuit 22 and the backup power supply 23 by a known method, the stop of power supply is detected. Note that the case where power supply to the notification broadcast receiver 110 from the outside of the notification broadcast receiver 110 is stopped is usually a case where a power failure occurs, so the power failure detection unit 111 detects the presence or absence of a power failure. It may be a power failure detection means. In addition to the same function as the control unit 93 of the third embodiment, the control unit 112 supplies or cuts off the power to the optical receiver 100 based on the detection result by the power failure detection unit 111. It has a function as a means.

(Operation-during power supply)
In the optical reception system 4 configured as described above, the switch 91 is normally controlled to be in the closed state by the control unit 112, and the DC power converted by the AC adapter 60 at the time of feeding is the same as in the third embodiment. Thus, the notification broadcast receiver 110 and the optical receiver 100 are operated.

(Operation-no power supply)
On the other hand, when no power is supplied, power from the backup power supply 23 is supplied to each part of the notification broadcast receiver 110 via the power supply circuit 22 so that the notification broadcast receiver 110 operates. Here, in the configuration of FIG. 4, since power is supplied to the optical receiver 100 via the power supply circuit 22, this power is supplied when power from the backup power supply 23 is supplied to the power supply circuit 22. Are consumed by the optical receiver 100. In order to prevent this, the power failure detection unit 111 monitors the stop of the power supply to the notification broadcast receiver 110, and when the stop of the power supply is detected, the power supply stop detection signal is transmitted to the control unit 112. Output to. The control unit 112 monitors the output of the power supply stop detection signal from the power failure detection unit 111. When the power supply stop detection signal is output, the control unit 112 controls the switch 91 to be in an open state, thereby notifying the broadcast. The power supply from the receiver 110 to the optical receiver 100 is cut off. However, even when the power supply is interrupted in this way, the optical receiver 100 performs a non-feeding operation as in the third embodiment.

(Operation-when no power supply is restored)
Thereafter, when it is detected that the power supply to the notification broadcast receiver 110 has been resumed, the power failure detection unit 111 outputs a power supply restart detection signal to the control unit 112. The control unit 112 monitors the output of the power supply resumption detection signal from the power failure detection unit 111. When the power supply resumption detection signal is output, the control unit 112 controls the switch 91 to be closed so that the notification broadcast is performed. The supply of power from the receiver 110 to the optical receiver 100 is resumed. Also in the present embodiment, the switch 91 is controlled to open and close based on the broadcast control signal, so that the optical receiver 100 can be operated as an addressable ONU. This control operation is performed in the third embodiment. Since it is the same as that, its description is omitted.

(effect)
As described above, according to the fourth embodiment, in addition to the effects of the third embodiment, the power failure detection unit 111 that detects the stop of power supply to the notification broadcast receiver 110 and the detection result by the power failure detection unit 111 are displayed. And a control unit 112 that supplies or cuts off the power to the optical receiver 100 based on the above. When the power supply to the notification broadcast receiver 110 is stopped, the notification broadcast receiver 110 to the optical receiver 100 is stopped. Can be cut off, and power from the backup power source 23 of the notification broadcast receiver 110 is not consumed by the optical receiver 100, so the notification broadcast can be continued for a longer time.

[Modifications to Embodiments]
Although the embodiments of the present invention have been described above, the specific configuration and means of the present invention may be arbitrarily modified and improved within the scope of the technical idea of each invention described in the claims. Can do. Hereinafter, such a modification will be described.

(About problems to be solved and effects of the invention)
First, the problems to be solved by the invention and the effects of the invention are not limited to the above-described contents, and the present invention solves the problems not described above or has the effects not described above. There are also cases where only some of the described problems are solved or only some of the described effects are achieved.

(Specific circuit configuration of optical receiver and notification broadcast receiver)
As specific circuit configurations of the optical receivers 10, 70, 100 and the notification broadcast receivers 20, 80, 90, 110, in addition to the circuit configurations shown in the respective embodiments, known circuit configurations should be applied. Can do.

(Appendix)
The optical receiver system of appendix 1 includes an optical receiver that converts an optical signal transmitted through an optical transmission path into an electrical signal, and an announcement broadcast receiver that performs an announcement broadcast using the electrical signal converted by the optical receiver. The power of the optical receiver can be supplied from the notification broadcast receiver.

  Further, the optical receiver system of appendix 2 is the optical receiver system of appendix 1, wherein the optical receiver includes an output terminal for outputting the electrical signal to the announcement broadcast receiver, and the announcement broadcast receiver Comprises an input terminal for receiving the input of the electrical signal from the optical receiver, connects the output terminal of the optical receiver and the input terminal of the notification broadcast receiver via a transmission line, and passes through the transmission line. Then, power is supplied from the input terminal of the notification broadcast receiver to the output terminal of the optical receiver.

  Further, the optical reception system according to supplementary note 3 is the optical reception system according to supplementary note 1 or 2, wherein the notification broadcast receiver supplies power supplied from the outside of the notification broadcast receiver to a required level in the notification broadcast receiver. A power supply circuit for converting the power into power, and the power supplied from the outside of the notification broadcast receiver is supplied to the optical receiver through the power supply circuit; the circuit voltage of the optical receiver and the notification broadcast receiver; The circuit voltage was mutually identical.

  Further, the optical receiving system according to appendix 4 is the optical receiving system according to any one of appendices 1 to 3, wherein the notification broadcast receiver is configured to supply power from outside the notification broadcast receiver to the notification broadcast receiver. A backup power source is provided as a power source when the supply is stopped, and the power supplied from the backup power source can be supplied to the optical receiver.

  Further, the optical reception system according to appendix 5 is the optical reception system according to any one of appendices 1 to 4, wherein the optical receiver notifies the TV signal as the electric signal when power is supplied to the optical receiver. A non-powered optical receiver that outputs a broadcast signal and outputs only the notification broadcast signal as the electric signal when power is not supplied to the optical receiver, and transmits the notification broadcast signal to the notification broadcast receiver. Power is supplied from the notification broadcast receiver to the optical receiver via a transmission path for the purpose.

  The optical reception system according to appendix 6 is the optical reception system according to appendix 5, wherein the notification broadcast receiver includes a broadcast control signal acquisition unit that acquires a broadcast control signal superimposed on the notification broadcast signal, and the broadcast Broadcast control power shut-off means for supplying or shutting off the power to the optical receiver based on the broadcast control signal obtained by the control signal obtaining means.

  Further, the optical reception system according to appendix 7 is the optical reception system according to any one of appendices 1 to 6, wherein the notification broadcast receiver is configured to supply power from the outside of the notification broadcast receiver to the notification broadcast receiver. A power supply stop detecting means for detecting a supply stop; and a power cut-off power shut-off means for supplying or shutting off the power to the optical receiver based on a detection result by the power supply stop detecting means.

  Further, the notification broadcast receiver of appendix 8 is connected to an optical receiver that converts an optical signal transmitted through an optical transmission path into an electrical signal, and broadcasts an announcement broadcast using the electrical signal converted by the optical receiver. An announcement broadcast receiver that performs power supply of the optical receiver.

  The notification broadcast receiver according to supplementary note 9 is the notification broadcast receiver according to supplementary note 8, further comprising an input terminal for receiving the input of the electric signal from the optical receiver, and power from the input terminal to the optical receiver. Supply.

  Further, the notification broadcast receiver according to supplementary note 10 is a power supply for converting the power supplied from the outside of the notification broadcast receiver into the required power at the notification broadcast receiver in the notification broadcast receiver according to supplementary note 8 or 9. A circuit is provided, and the electric power supplied from the outside of the notification broadcast receiver is supplied to the optical receiver via the power supply circuit.

  In addition, the notice broadcast receiver according to appendix 11 is the notice broadcast receiver according to appendix 10, wherein the notice broadcast receiver has stopped power supply from the outside of the notice broadcast receiver to the notice broadcast receiver. A backup power source serving as a power source in the case is provided, and the power supplied from the backup power source can be supplied to the optical receiver via the power supply circuit.

  Further, the notification broadcast receiver according to appendix 12 is a broadcast control signal for acquiring a broadcast control signal superimposed on the notification broadcast signal input from the optical receiver as the electric signal in the notification broadcast receiver according to appendix 11. An acquisition unit; and a broadcast control power cutoff unit that supplies or cuts off power to the optical receiver based on the broadcast control signal acquired by the broadcast control signal acquisition unit.

  In addition, the notification broadcast receiver according to supplementary note 13 detects a stop of power supply from the outside of the notification broadcast receiver to the notification broadcast receiver in the notification broadcast receiver according to any one of supplementary notes 8 to 12. Power supply stop detecting means for performing power failure, and a power cut-off means for power failure corresponding to supplying or cutting off power to the optical receiver based on a detection result by the power supply stop detecting means.

(Additional effects)
As described above, according to the optical receiver system described in appendix 1 or the notification broadcast receiver described in appendix 8, the power of the optical receiver can be supplied from the notification broadcast receiver. A power inserter and an AC adapter for performing the operation can be omitted, and the optical receiving system can be configured easily and inexpensively.

  In addition, according to the optical receiver system described in Appendix 2 or the notification broadcast receiver described in Appendix 9, the notification broadcast receiver via the transmission path for transmitting an electrical signal from the optical receiver to the notification broadcast receiver. Since the power is supplied to the optical receiver, the optical receiver power can be supplied from the notification broadcast receiver by simply connecting the optical receiver and the notification broadcast receiver as in the conventional case. Since there is no need to provide a path, the optical receiving system can be configured more simply and inexpensively.

  Further, according to the optical receiver system described in appendix 3 or the notification broadcast receiver described in appendix 10, since the power is supplied to the optical receiver via the power supply circuit of the notification broadcast receiver, the circuit voltage of the optical receiver If the circuit voltage of the notification broadcast receiver is the same, it is no longer necessary to provide a power circuit in the optical receiver, and the optical receiver system and optical receiver can be configured more simply and inexpensively. Become.

  Further, according to the optical receiver system described in appendix 4 or the notification broadcast receiver described in appendix 11, the power supplied from the backup power source of the notification broadcast receiver can be supplied to the optical receiver. Even at times, it is possible to operate the optical receiver in addition to the notification broadcast receiver, and it is possible to reliably perform emergency notification broadcast even during a power failure.

  Further, according to the optical receiver system described in appendix 5, the optical receiver is a non-powered optical receiver, and the notification broadcast receiver is connected via the transmission path for transmitting the notification broadcast signal to the notification broadcast receiver. Since the optical receiver supplies power to the optical receiver, when there is no power supply, the optical receiver can operate without receiving power from the notification broadcast receiver, and when the notification broadcast receiver operates with a backup power source when there is no power supply. Even in such a case, the power from the backup power source is not consumed by the optical receiver, so that it is possible to continue the notification broadcast for a longer time in the event of a power failure.

  Further, according to the optical reception system described in appendix 6 or the notification broadcast receiver described in appendix 12, broadcast control signal acquisition means for acquiring a broadcast control signal, and power to the optical receiver based on the broadcast control signal Since the broadcasting control power shut-off means for supplying or shutting off the TV receiver is provided, the optical receiver can be used as a so-called addressable ONU, and the shut-off and restoration of the TV broadcast can be remotely controlled.

  Further, according to the optical reception system described in appendix 7 or the notification broadcast receiver described in appendix 13, the power supply stop detection unit that detects the stop of power supply to the notification broadcast receiver, and the power supply stop detection unit Power cut-off power cut-off means for supplying or cutting off power to the optical receiver based on the detection result of the notification broadcast receiver when the power supply to the broadcast broadcast receiver is stopped. Since the power supply to the optical receiver can be cut off and the power from the backup power source of the notification broadcast receiver is not consumed by the optical receiver, the notification broadcast can be continued for a longer time.

1, 2, 3, 4 Optical receiver system 10, 70, 100, 200, 202 Optical receiver 20, 80, 90, 110, 205 Notification broadcast receiver 21 Input terminal 22, 76 Power supply circuit 23 Backup power supply 24, 92 Detection Unit 25 Speaker 26, 93, 112 Control unit 27, 78, 79 Coil 28, 77 Condenser 30, 204 TV receiver 40 Distributor 50 Coaxial cable 60, 207, 208 AC adapter 71 PD
72 Short circuit 72a, 91 Switch 73 Amplifier 74 RF signal output terminal 75 FM signal output terminal 111 Power failure detection unit 201 Optical amplifier 203 Optical cable 206 Power inserter

Claims (5)

An announcement broadcast receiver connected to an optical receiver for converting an optical signal transmitted through an optical transmission path into an electric signal, and performing an announcement broadcast by the electric signal converted by the optical receiver,
Capable of supplying power of the optical receiver;
Broadcast control signal acquisition means for acquiring a broadcast control signal superimposed on the notification broadcast signal input from the optical receiver as the electrical signal, and based on the broadcast control signal acquired by the broadcast control signal acquisition means A broadcast control power shut-off means for supplying or shutting off the power to the optical receiver,
Announcement broadcast receiver. An input terminal for receiving the input of the electrical signal from the optical receiver;
Supplying power to the optical receiver from the input terminal;
The notification broadcast receiver according to claim 1. A power supply circuit that converts electric power supplied from outside the notification broadcast receiver into required power in the notification broadcast receiver, the electric power supplied from outside the notification broadcast receiver through the power supply circuit Supply to optical receiver,
The notification broadcast receiver according to claim 1 or 2. The notification broadcast receiver includes a backup power source that is a power source when power supply to the notification broadcast receiver from the outside of the notification broadcast receiver is stopped, and the power supplied from the backup power source is the power source. Can be supplied to the optical receiver via a circuit;
The notification broadcast receiver according to claim 3. A power supply stop detection means for detecting a stop of power supply to the notification broadcast receiver from the outside of the notification broadcast receiver;
When the stop of power supply to the notification broadcast receiver from the outside of the notification broadcast receiver is not detected by the power supply stop detection means, power is supplied to the optical receiver, and the notification broadcast receiver A power cut-off power cut-off means for shutting off the power to the optical receiver when a stop of power supply to the notification broadcast receiver from the outside is detected by the power supply stop detection means,
The notification broadcast receiver according to any one of claims 1 to 4.

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