JPS62221287A - Catv system - Google Patents

Abstract

PURPOSE:To most suitably select a scope of guest rooms that are forcibly caused to receive emergency information by interlocking a function forcibly broadcasting emergency information with a fire alarm. CONSTITUTION:If the fire alarm FD detects the occurrence of a fire in a building, one or more relays FD1, FD2... showing the place where the fire starts operate. Among fire start place signals F1, F2... the corresponding signal sets an FF 12 through an OR gate 11, and an operation mode is automatically shifted to an emergency mode. Corresponding to the fire start place specified from the fire start place signals F1, F2..., a command code generator circuit 35 outputs a control command signal 10b only to a terminal equipment in the guest room to which an emergency evacuation order is issued so that said equipment can forcibly receive the emergency information. Thus a scope of guest rooms that forcibly receive the emergency information can be selected suitably.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention is applicable to CATV systems, particularly in public accommodation facilities such as hotels and inns, which provide emergency evacuation for terminal devices installed in each guest room in the event of an emergency. The present invention relates to a CATV system that can forcefully broadcast information.

Prior Art In public accommodation facilities such as hotels and inns, it is important to accurately disseminate information regarding emergency evacuation to guests in the event of a disaster such as an earthquake or fire, and if this does not function effectively, It is already well known that this can lead to unexpected major accidents.

On the other hand, at present, almost all hotels, inns, etc. are equipped with television receivers, so using this, a so-called CATV system exclusively for in-house use is constructed and the system is installed. If the above-mentioned emergency information is forced to be broadcast using this system, it is possible to make the emergency information more widely known.

For example, Japanese Unexamined Patent Publication No. 59-8494 discloses that a center transmits a video signal and a control command signal to the television receivers installed in each guest room via a transmission line to receive television signals. A technique for forcibly turning on a device and forcibly receiving a specific channel is disclosed. This system can be evaluated as a representative system based on the above-mentioned technical viewpoint, and by devising the command code included in the control command signal, it is necessary to forcibly turn on the power and force reception on a specific channel. Since the target range of the television receiver can be freely selected, there is a great advantage that flexibility can be included in the system.

However, this system does not solve any system operational problems, such as what kind of emergency situation should be assumed and to what range of guest rooms should the forced reception function be applied in the event of an emergency situation? It has not been. In other words, when it is assumed that a fire has broken out in a large-scale hotel with several hundred to several thousand guest rooms, emergency evacuation information should always be broadcast omnipotently and simultaneously, regardless of the location of the fire or the scale of the fire. On the contrary, there is a risk that all the guests will be thrown into a state of panic, so it is not necessarily the best measure from a safety point of view. On the other hand, even if such circumstances exist, it goes without saying that this should not become a factor that impedes the accurate communication of information to guests in guest rooms that are close to the source of the fire and must be evacuated immediately. . Therefore, the system must be constructed with utmost care in order to disseminate the best form of emergency information in order to safely evacuate all guests.

Purpose of the Invention The present invention, in view of the actual state of the prior art, is to optimally select the range of guest rooms that are forced to receive emergency information by linking the forced broadcasting function of emergency information with a fire alarm in a CATV system. To provide a CATV system that can reliably transmit emergency information to guests in guest rooms that need to be evacuated immediately, without causing the omnipotent guests to panic. is.

Structure of the Invention The structure of the present invention to achieve the above object is to provide a center device with a plurality of broadcast sources including a general broadcast source for broadcasting normal television programs and an emergency broadcast source for broadcasting emergency information. and a broadcast source switching circuit for selecting the plurality of broadcast sources, and according to a control mode,
The broadcast source switching circuit switches between the plurality of broadcast sources, and the command code generating circuit generates a command code for controlling the terminal device, and each video from the broadcast source and general broadcast source selected by the broadcast source switching circuit generates a command code for controlling the terminal device. The signal and the control command signal containing the command code are mixed and sent to the transmission line, while at the terminal device, the transmitted video signal and control command signal are separated by a splitter and controlled by the controller. When decoding a command signal and forcing the television receiver to turn on and receive a predetermined channel according to the contents of the command code, the control mode is an emergency mode and the fire alarm When there is a fire outbreak location signal, the target range for forced reception of emergency information output from the emergency broadcasting source can be selected in accordance with the fire outbreak location specified by the fire origination location signal. The gist is that accurate emergency information can be reliably communicated only to guests in guest rooms that actually require emergency evacuation.

Example Examples will be described below with reference to the drawings.

The CATV system includes a center device C that has a control device 10, an interrupt broadcast source 50, and a general broadcast source 73, a transmission path, and a large number of terminal devices T connected to the transmission path.
(Figure 1).

The control device 10 included in the center device C includes a command code generation circuit 35, and an emergency mode switch ESI,
While signals from the cancel switch ES2, return switch ES3, fire alarm FD, clock TM, business mode switch NS1, business mode end switch NS2, and keyboard KB are being input, the emergency signals included in the interrupt broadcast source 50 are being input. Activation signals 10C1, 10C2, and 10C3 to the broadcast source 51, regular broadcast source 52, and commercial broadcast source 53, and the control mode signal 10a to the broadcast source switching circuit 60 also included in the interrupt broadcast source 50 are mixed. Control command signal 10b to device 72
is output. In general, the on-air emergency signal 54b from the on-air emergency broadcast source 54 is input to the control device 10, while a start signal to the emergency mode indicator ED is output.

Video signals 51a, 52a, . . . from each broadcast source 51, 52, . The signal is then guided to the mixer 72 and sent out to the transmission path. Further, a video signal 73a output from a general broadcast source 73 is also input to the mixer 72.

The general broadcasting source 73 receives television broadcasting waves from the public broadcasting network, and receives them as is or adds an original program exclusive to the hall to provide a multi-channel video signal 73a.
A well-known device can be used as a head amplifier for a so-called CATV system.

The emergency broadcast source 51 has, for example, a video tape recorder VTR 51 as its main equipment (FIG. 2), and operates in response to a start signal 10C1 from the control device 10, thereby outputting a video signal (2) and an audio signal. It is possible to output a video signal 51a consisting of A.

However, it is assumed that the video tape recorder VTR 51 has a function in which, when the activation signal 10C1 is input, a series of operations of power-on, playback, and rewinding are continuously performed by a control circuit (not shown). Note that in place of the video tape recorder VTR 51, any other device can be used as long as it has the function of transmitting both or one of the video signal V and the audio signal A.
For example, Fuji Photo Film Co., Ltd.'s Fujisix TV Photo System). Furthermore, video tape recorder V
The TR 51 may be equipped with a cassette changer to enable automatic sequential playback of multiple video cassette tapes.

The scheduled broadcast source 52 and the commercial broadcast source 53 each have the same configuration as the emergency broadcast source 51 described above, and operate in response to the activation signals 10c2 and 10c3 from the control device 10. As an output, a video signal 52
a, 53a.

On-air emergency broadcast source 54 may be a public broadcasting network, e.g.
The Japan Broadcasting Corporation (NHK) uses Chivis' emergency broadcast system (Figure 3), and is always on standby by receiving broadcast waves, and when it detects an emergency broadcast start signal included in it, it responds to it. and a video tape recorder VTR 54 which is activated by an on-air emergency signal 54b outputted by the start of its operation and outputs a video signal ■. There is. As described above, the on-air emergency signal 54b is also branched into the control device 10.

The broadcast source switching circuit 60 forms a part of the interrupt broadcast source 50, and includes relays 11X, 12X, . . . operated by the control mode signal 10a from the control device 10.
Figure 4). However, the control 0 mode signal 10a is composed of control mode signals 10al, 10a2, . and each of those signal lines connects to each relay 11X, 12
It is connected to one end of each coil of X..., while the other end is
Connected to positive power supply +P. However, each relay 11X, 1 corresponding to emergency mode and on-air emergency mode
4x are normally closed contacts 14xb and 11x, respectively.
An interlock is applied by b. Furthermore, each line of the audio signal A and the video signal @V of the video signals 51a, 52a, which are the outputs of the broadcast sources 51, 52,... included in the interrupt broadcast source 50, is connected to each relay 11X, 12X.・・・
are connected in parallel via normally open contacts 11Xa, 12xa, . In addition, relays 11X, 12
x... may be an electronic switching element other than a relay.

A portion of the control device 10 related to control in the emergency mode is shown in FIG.

The manual emergency mode switch ESI is branch-connected to the timer 13 and the OR gate 11, while the output of the OR gate 11 is connected to the set terminal S of the flip-flop 12, and the output terminal Q of the flip-flop 12 is connected to the emergency mode switch ESI. It is branch-connected to the mode display ED, the Nantes gate 17, and the command code generation circuit 35, and is connected to the emergency broadcast source 5.
It is externally outputted as a start signal 10cl to 1.

Further, the output of the timer 13 is input directly to the Nant gate 17 and to the AND gate 15 via the inverter 14, and the output of the Nant gate 17 is input to the control mode signal 10a1 to the broadcast source switching circuit 60. and is output externally. Further, the output of the AND gate 15 is connected to the reset terminal R of the flip-flop 12 via an OR gate 16, and the return switch ES3 is connected to this OR gate 16.

The cancellation switch ES2 serves as one input of the AND gate 15, while the fire location signals F1, F2, . . . obtained by the relays FD1, FD2, . 11 and the command code generation circuit 35. Further, the command code generation circuit 35 outputs the control command signal 10b, which is led to the mixer 72 as described above. Here, the fire location signals F1, F2, etc. from the relays FDI, FD2, etc. are, for example, in the P' type 1 class fire alarm receiver, the transfer signals accompanying the operation of the district relays. It can be used as is.

A part of the control device 10 related to control in the scheduled mode corresponds to a clock TM which outputs, by means of timer signals TMI and TM2, that the time for scheduled broadcasting has arrived (FIG. 6). The output of the clock TM is connected to the set terminal S of the flip-flop 18 and the reset terminal R of the flip-flop 18, while the output terminal Q of the flip-flop 18 is connected to the scheduled broadcast source 52 via the AND gate 19. It is pulled out to the outside as a starting signal '1Qc2, and is also input to the inverter 20 and the command code generation circuit 35. The output of the inverter 20 is guided to a broadcast source switching circuit 60.
As described above, the output of the command code generation circuit 35 is the control command signal 10b. In addition, the above-mentioned emergency broadcast source 5
The activation signal 10cl to 1 is passed through the inverter 21,
It is input to the AND gate 19.

Business mode switch NS1 and business mode end switch N
S2 and the keyboard KB serve as input signals to the portion of the control circuit 10 related to the business mode (FIG. 7).

That is, the business mode switch NSI and the business mode end switch NS2 each have a flip-flop 25.
is connected to the set terminal S and reset terminal R of
A keyboard KB is connected to the command code generation circuit 35. The output terminal Q of the flip-flop 25 is pulled out to the outside via the AND gate 26, and is connected to the commercial broadcasting source 5.
3 becomes the activation signal 10C3, while the AND gate 26
The output of the inverter 27 and the command code generation circuit 35 are branched and connected, and the output of the inverter 27 is a control mode signal 10a3 to the broadcast source switching circuit 60. The AND gate 26 also has the above-mentioned activation signal 10C1,
]OC2 are input via inverters 28 and 29, respectively.

The on-air emergency signal 54b output from the on-air emergency broadcast source 54 is also input to the control device 10 (third
figure). That is, the on-air emergency signal 54b is input directly to the set terminal S of the flip-flop 31 and to its reset terminal R via the inverter 32, while the output terminal Q of the flip-flop 31
3 to the broadcast source switching circuit 60 as a control mode signal 10a4, and is branch-connected to the command code generation circuit 35.

The modulator 71 converts a carrier wave of a predetermined channel suitable for transmission through a transmission path into a video signal 60 that is sent from the interrupt broadcast source 50 and is output from the broadcast source switching circuit 60.
(FIG. 1), the mixer 72 mixes the control command signal 10b generated by the command code generation circuit 35 which is a part of the control device 10, the output of the modulator 71, and the general broadcast signal. A mixer amplifier is used to mix the plurality of channels of video signals 73a from the source 73 and send the mixed signal to the transmission line.

The terminal device T includes a duplexer 81 for separating a video signal and a control command signal transmitted from the center device C via a transmission path, and a converter 82 for frequency converting the separated video signal 81a. , and a television receiver 83 that receives the output of the converter 82 (FIG. 8). The control command signal 81b separated by the duplexer 81 is input to the controller 84, and its output is input to the converter 82 as a channel designation signal 84a. In general, the controller 84 is attached with a keyboard 86 and is connected to a power relay 85, whose contacts 85a are inserted into the power line AC of the television receiver 83. In CATV systems in hotels, inns, etc., terminal equipment @T, T.
... are distributed in each guest room.

The operation of the CATV system having such a configuration is as follows.

The system broadcasts the television broadcast program from the general broadcast source 73 to all the terminal devices T, T, etc. in each guest room unless the operation of each control mode of emergency mode, scheduled mode, and business mode is started. It is operated as a partial mode. At this time, the general broadcasting source 73 receives the television broadcasting waves from the public broadcasting network, or adds an original program exclusive for the hall to the video signals 73a of multiple channels.
(FIG. 1), the command code generation circuit 35 included in the control device 10 generates the control command signal 10b,
In addition, each broadcast source 51, 52, included in the interrupt broadcast source 50,
... are not producing that output.

Here, the command code generation circuit 35 generates a command code consisting of serial data including, for example, a synchronization code, a terminal address, and a command, and transmits this to the control command signal 1.
It is output as 0b. Further, since this control command signal 10b is sent to the mixer 72, the signal sent from the mixer 72 to the transmission path is the multi-channel video signal 73 from the general broadcasting source 73 in the general mode.
a and the control command signal 10b are mixed and superimposed.

On the other hand, if we focus on any terminal device T connected to the transmission path (Fig. 8), the composite signal of the video signal and control command signal transmitted from the center device C through the transmission path is first , are input to the duplexer 81. The duplexer 81 separates a video signal 81a and a control command signal 81b from the transmitted composite signal, and sends the former to the converter 82 and the latter to the controller 84. Therefore, the controller 84 decodes the control command signal 81b, picks up the one whose terminal address matches the number of the terminal device T, and operates the keyboard output from the keyboard 86 according to the contents of the accompanying command. The signal 86a is blocked or allowed to be input to the controller 84. That is, the command of the command code included in the control command signal 81b is transmitted to the terminal device T,
When allowing the reception of general broadcasts sent from the general broadcast source 73, the controller 84 can receive or turn off the keyboard operation signal 86a from the keyboard 86.
As a result, a guest in the guest room where the terminal device T is installed can use the keyboard 86 to connect to the television receiver 8.
By turning on the power source 3 and operating the converter 82 via the controller 84, the user can freely enjoy television programs on any channel of the transmitted video signal 81a of multiple channels. Here, the converter 82 is a frequency converter that extracts any one channel from the video signal 81a and inputs it to the television receiver 83. The designation of which channel to extract is made by operating the keyboard 86. Correspondingly, controller 8
The channel designation signal 84a outputted by the channel designation signal 84a can be selected according to the content of the channel designation signal 84a.

In the above explanation, the control command signal @81b is a control command signal 10b containing a command code generated by the command code generation circuit 35, which is transmitted to the terminal device T via the mixer 72 and the transmission path. and separated by a duplexer 81, and in this general mode,
The command code is for all terminal devices included in the system.
. . are permitted to receive general broadcasts from the general broadcast source 73. At this time, by devising the format of the terminal address or command in the command code and the reading function of the command code sent to the controller 84, this command can be sent to all terminal devices T, T, etc. in one action. It goes without saying that it is also possible to allow reception of general broadcasts.

For example, when a special code exists in the terminal address, if the above-mentioned block of the keyboard operation signal 86a from the keyboard 86 is unblocked, all terminal devices T, T, etc. On the other hand, there is no need to issue any separate instructions.

The control mode of the system can be switched from the general mode to the business mode by manually operating the business mode switch NSI (FIG. 7). That is, since the flip-flop 25 is set by operating the business mode switch NSI, if it is confirmed by the AND gate 26 that the mode is not the emergency mode or scheduled mode, then the business mode in the interrupt broadcast source 50 is set. An activation signal @10G3 to the broadcast source 53 is output.

The commercial broadcast source 53 is activated by the activation signal 10c3, and the control mode signal 10a3 is transmitted to the broadcast source switching circuit 60 via the inverter 27, so that the relay 13X in the broadcast source switching circuit 60 becomes inoperable. Figure 4)
, the video signal 53a that is the output of the commercial broadcast source 53 activated by the activation signal '1Qc3 is transmitted to the broadcast source switching circuit 6.
The output 60a of zero is sent out to the transmission path via the mixer 72.

On the other hand, the command code generation circuit 35 included in the control device 10
specifies the terminal devices T, T, .

Of course, the command code generation circuit 35 is connected to the keyboard KB.
Only terminal devices T, T, etc. that are manually configured using At the same time, the power relay 85 inserted in the TV receiver 83 is turned on, and the converter 82 is turned on at t16[IL, so that the TV receiver 83 receives the video signal output from the commercial broadcasting source 53. A command code for controlling the controller 84 to receive the channel 53a is sent to the control command signal 10.
As b, it is sent to the mixer 72. However, the channel of the video signal 53a is a carrier wave channel used by the modulator 71, and is predetermined as a predetermined channel.

In this way, all the terminal devices TST... selected by the keyboard KB are checked whether they are powered on or not in each cabin or the multi-channel video signal 7 transmitted from the general broadcasting source 73.
Regardless of which channel of 3a is being received,
Since information from the commercial broadcasting source 53 will be forced to be received, according to this business mode, for example, uniform public information for guests of eight specific hotels manually selected using the keyboard KB will be forced to be received. can be broadcast to.

This business mode is useful, for example, when communicating action instructions to a group of people staying separately in specific guest rooms, and can also be used for other general business communications. , Needless to say.

Note that even in the business mode, terminal devices other than the terminal devices T, T, . . . selected by the keyboard KB maintain a state in which reception of the television program transmitted from the general broadcasting source 73 is permitted. Therefore, general broadcast receivers in those terminal devices will not be affected in any way.

To end the operation in the business mode, the business mode end switch NS2 may be operated (FIG. 7).

As a result, the flip-flop 25 is reset, so the activation signal @10c3 disappears and the commercial broadcasting source 5
3 stops and at the same time, the control mode signal 10a3 is also lost, so the relay 13X in the broadcast source switching circuit 60 is restored and the commercial broadcast source 53 is disconnected from the transmission path.

At the same time, the command code generation circuit 35 sends out the command code previously sent.
It outputs a control command signal 10b containing a command code to cancel the forced reception command for the terminal devices T, T, . . . and returns to the general mode.

When the clock TM detects the arrival of the time for regular broadcasting while the system is operating in the general mode or business mode, the control mode of the system can automatically shift to the regular mode. That is, since the timer signal TMI output from the clock TM sets the flip-flop 18 (FIG. 6), the AND gate 19
If it is confirmed that it is not currently in the emergency mode, a start signal 10C2 is sent to the scheduled broadcast source 52, and the broadcast source switching circuit 6
The control mode signal 10a2 for 0 is output, the regular broadcast source 52 is activated in the same way as in the business mode, and the output video signal @52a is transmitted to the broadcast source switching circuit 60, modulator 71, mixer 72, it is sent out to the transmission path on a predetermined channel that is the same as the channel used by the commercial broadcasting source 53.

On the other hand, since the activation signal 10G2 is also input to the command code generation circuit 35, the command code generation circuit 35 transmits the scheduled broadcast from the scheduled broadcast source 52 to all the terminal devices T, T, . A control command signal 10b for performing forced reception is generated, and a similar forced broadcast can be performed for all terminal devices T, T, . . . by entering the business mode.

However, if it becomes uneconomical to perform such regular broadcasting even to guest rooms where guests are not staying, the command generated by the command code generation circuit 35 may be changed. Of course, it is also possible to exclude the terminal devices T, T, . . . where such circumstances exist.

To end the operation in the scheduled mode, the clock TM outputs another timer signal QTM2 indicating the elapse of the scheduled broadcast time, thereby resetting the flip-flop 18. As a result, both the activation signal 10C2 and the control mode signal 10a2 disappear, and the regular broadcast source 52 stops its operation and is disconnected from the system. On the other hand, the command code generation circuit 35
At this time as well, the control command signal 10b is output, and the terminal devices T, T, . Note that the end of the scheduled mode is not only determined by the timer signal TM2 from the timer TM, but also by the scheduled broadcast source 5.
It is also possible to use a cue signal for detecting the end of the second program.

Such forced broadcasting in scheduled mode is convenient for broadcasting information on evacuation routes to be opened in case of an emergency, how to use emergency equipment, etc., as well as public information on advertisements for in-house events.

The system can transition to emergency mode at any time, whether in its control mode, general mode, business mode, scheduled mode, or even if all broadcast sources are out of service. Therefore, the transition to this emergency mode is performed by operating the manual emergency mode switch ESI, and when the fire alarm λ■ device FD detects a fire in the building, the emergency alarm receiver R54 included in the on-air emergency broadcast source 54 is activated. Since there are cases where the emergency broadcast start signal is detected, each of these cases will be described below.

When the emergency mode switch ESI is manually operated, the flip-flop 12 is set via the OR gate 11 (FIG. 5), so the activation signal 10 to the emergency broadcast source 51 is set.
cl is output and started, and the control mode signal 10a1 is output to the broadcast source switching circuit 60, so the emergency broadcast source 51 is connected to the transmission path (the fourth
figure).

Since the activation signal 1001 is input to the emergency mode display ED (FIG. 5), it can indicate the transition to the emergency mode, while the activation signal 10C1 is input to the command code generation circuit 35.
Since the input is also input to the emergency broadcast source 51, the emergency broadcast from the emergency broadcast source 51 is forced to all the terminal devices T, T, etc. included in the system in the same way as in the above-mentioned scheduled mode. You can receive it.

Therefore, the output of the timer 13 connected to the emergency mode switch ESI will not open the Nantes gate 17 unless the emergency mode switch ESI is pressed for a period exceeding the set time, so that the output of the timer 13 connected to the emergency mode switch ESI will not open the Nantes gate 17. It is possible to effectively eliminate the possibility that the emergency information from the broadcasting source 51 will be broadcast within the omnipotence and cause unnecessary panic among the guests. Furthermore, if necessary while the timer 13 does not time up, the AND gate 15 is open, so the flip-flop 12 can be reset by operating the cancellation switch ES2, and the erroneous operation of the emergency mode switch ESI can be canceled. Roughly speaking, if the return switch ES3 is operated, the flip-flop 12 can be similarly reset via the OR gate 16, so that the return from the emergency mode can be canceled.

Once the control mode shifts to the emergency mode, the activation signal 10C1 is input to the AND gate 26.19 via the inverter 28.21 (Figures 6 and 7), so the business mode/scheduled mode Each activation signal 10c3.1
The output of 0c2 will be blocked, so the emergency mode can operate with highest priority compared to the other two modes.

When the fire alarm FD detects a fire outbreak in the building, one of the relays FDI, FD2, etc. indicating the location of the fire is activated.
Since one or several of them operate (Fig. 5), the corresponding one of the fire outbreak location signals F1, F2, etc.
Through the OR gate 11, the flip-flop 12 is set and the control mode is automatically transferred to the emergency mode. On the other hand, since the fire location signals F1, F2, .
・In response to the fire outbreak location identified from 10b, thereby
It is possible to prevent unnecessary panic from occurring when emergency information is uniformly broadcast to all guests. At this time, the range of guest rooms that will be forced to receive emergency information in response to the identified fire outbreak location will be determined by taking into consideration the level of ditch construction and evacuation equipment in the building, the usage status of the guest rooms, etc. , should be selected to have the highest degree of safety, and by incorporating software for realizing this into the command code generation circuit 35, it becomes possible to protect the lives of guests to the maximum. In addition, as the fire progressed, the fire alarm FD sent messages to the location of the fire one after another @Fl, F2.
. . is output, it is also possible to continue broadcasting the emergency information while expanding the range of terminal devices T, T, . . . that should receive the emergency information each time.

Roughly speaking, the content of the emergency information when the fire alarm 11 FD detects the occurrence of a fire in the building, that is, the content of the video signal 51a output from the emergency broadcast source 51, is processed by the command code generation circuit 35 as the emergency information. Forced reception V
Depending on the location of the terminal device T, T, etc. in the building, it is also possible to change it to an optimal one. In other words,
Control command signal 10b which is the output of the command code generation circuit 35
is also sent to the emergency broadcast source 51, and thereby the content of the video signal 51a sent from the emergency broadcast source 51 is transmitted to the fire outbreak location identified from the fire outbreak location signals Fl, F2, and the optimal evacuation location. If information such as routes is included, it is possible to give not only an emergency evacuation order but also accurate evacuation guidance instructions to guests.

Emergency warning receiver R included in on-air emergency broadcast source 54
When 54 detects an emergency broadcast start signal, it must forcefully receive the contents of the emergency broadcast received from the public broadcasting network on all terminal devices @T, T... (Figure 3). In other words, emergency alert reception UNR5
4 outputs an on-air emergency signal 54b when it detects the emergency broadcast start signal, so this on-air emergency signal 54b
starts the video Q7'L/coder VTR 54, sets the flip-flop 31, sends the control mode signal 1Qa4 to the broadcast source switching circuit 60, and connects the on-air emergency broadcast source 54 to the transmission line. On the other hand, all the terminal devices T,
The video signal 54a transmitted from the on-air emergency broadcast source 54 can be forced to be received by controlling the video signals 54a. However, in consideration of the current situation that the contents of emergency broadcasts provided by public broadcasting networks are only audio information, this audio information is transmitted as audio signal A from the emergency warning receiver R54. On the other hand, V
The TR 54 is provided primarily to send out background information as a video signal (2) to keep the guest's psychological state calm. Emergency broadcasts provided by public broadcasting networks are generally broadcast as advance notice of microcrystalline disasters far in advance of the expected time of actual disaster occurrence, so it is necessary to force the omnipotence to do so all at once. Even if the broadcast is made, there is little risk that all guests will fall into a state of panic, but in the same way as when the fire alarm is linked to the fire alarm FD mentioned above,
Terminal devices T, T, and T.
It goes without saying that the data may be divided into a plurality of blocks and the information may be transmitted sequentially.

The operation of the on-air emergency broadcast source 54 is stopped because the emergency warning receiver R54 stops outputting the on-air emergency signal 54b in response to receiving the end signal of the emergency broadcast.

In addition, although the above explanation has been given regarding the example applied to public accommodation facilities such as hotels and inns, this invention can also be applied to other facilities such as large-scale apartment complexes and large-scale office buildings. Needless to say, it is applicable.

As described in detail, according to the invention, a general broadcast source;
An interrupt broadcast source consisting of a plurality of broadcast sources including an emergency broadcast source is provided, and the broadcast source is switched in control mode, and when in the emergency mode, video transmitted from the emergency broadcast source is transmitted from the terminal device. It is possible to force reception of the signal, and at the same time, when there is a fire outbreak location signal from a fire alarm, the range of the terminal device that causes the forced reception is specified from the fire outbreak location signal. By making the optimal selection based on the location of the fire, emergency information can only be disseminated to guests who are close to the location of the fire and should actually begin emergency evacuation actions, eliminating the need for rapid emergency evacuation. Since it is possible to not broadcast emergency information to other guests, it is possible to ensure that emergency information is transmitted to guests whose guest rooms are currently in need of urgent evacuation. , which has the extremely good effect of reducing the risk of sending the omnipotent guests into unnecessary panic.

[Brief explanation of drawings]

Figures 1 to 8 show an embodiment. Figure 1 is an overall block diagram, Figure 2 is a block diagram of a regular broadcast source, and Figure 3 is a block diagram of the on-air emergency broadcast source and main parts of the control circuit. , FIG. 4 is a connection diagram of the broadcast source switching circuit, FIGS. 5 to 7 are block diagrams of the main parts of the control circuit, and FIG. 8 is a block diagram of the terminal device. C... Center device L... Transmission line T... Terminal device FD... Fire alarm Fl, F2... Fn... Fire location signal ESI...
Emergency mode switch R54...Emergency alert receiver TM...Clock TMI...Timer signal 10b...Control command signal 35...Command code generation circuit 50...Interrupt broadcast source 51...Emergency Broadcasting source 51a...Video signal 5
2... Scheduled broadcast source 52a... Video signal 54
... On-air emergency broadcast source 60 ... Broadcast source switching circuit 72 ... Mixer 73 ... General broadcast source 81 ... Duplexer 82 ... Converter 83 ... Television receiver 84. ··controller

Claims (1)

[Scope of Claims] 1) Consists of a center device and a plurality of terminal devices connected to the center device via a transmission path, the center device comprising:
a general broadcast source that outputs video signals of multiple channels;
an interrupt broadcast source that outputs a video signal of a predetermined channel; a command code generation circuit that generates a command code for remotely controlling the terminal device according to a control mode and outputs the command code as a control command signal; and the broadcast source. and a mixer that mixes each video signal from the source and the control command signal and sends the mixture to the transmission path, and the interrupt broadcast source mixes the video signals from the plurality of video signals and the control command signal and sends the mixture to the transmission line, and the interrupt broadcast source mixes the video signals and the control command signal, and the interrupt broadcast source mixes a plurality of broadcast sources including an emergency broadcast source and the control command signal according to the control mode. a broadcast source switching circuit that selects the plurality of broadcast sources; a television receiver that receives a video signal separated by the splitter via a converter; and a television receiver that decodes the control command signal separated by the duplexer and turns on the power of the television receiver according to the content of the command code. a controller that controls the converter to input the video signal of the predetermined channel to the television receiver, and causes the terminal device to forcibly receive information transmitted from the interrupt broadcast source. Tenaru CAT
In the V system, the control mode includes an emergency mode, and when there is a fire location signal from a fire alarm in the emergency mode, the forced reception target is determined according to the fire location specified by the fire location signal. CAT characterized by being able to select the range of terminal devices to be used.
V system. 2) The interrupt broadcast source includes an on-air emergency broadcast source that is linked to an emergency broadcast system broadcast from a public broadcasting network, and the emergency mode is set to an emergency alert receiver included in the on-air emergency broadcast source. 2. The CATV system according to claim 1, wherein the CATV system can start operation also by an output. 3) The CATV system according to claim 1 or 2, wherein the emergency mode can also be activated by a manual emergency mode switch. 4) The interrupt broadcast source includes a scheduled broadcast source, and the scheduled broadcast source is started in a scheduled mode in which it starts operating by a timer signal from a clock that detects the arrival of the time when scheduled broadcast should be performed. The CAT according to any one of claims 1 to 3, wherein the scheduled mode operates with a lower priority than the emergency mode.
V system.