JP3643161B2 - Voice call system - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a voice call system in which a plurality of interphones provided on a terminal side and an interphone provided in a center are connected via a frequency-multiplexed coaxial cable, and more particularly to a voice call system suitable for a housing complex.
[0002]
[Prior art]
Conventionally, in an apartment building voice call system, as shown in FIGS. 4 and 5, each of the terminal-side dwellings JT1,... JTn, for example, a dwelling unit intercom in each dwelling unit, an elevator intercom in an elevator, etc. A plurality of interphones for different purposes and terminal call modems corresponding to the interphones were provided. In addition, the center that manages the information of these multiple buildings has a plurality of interphones and call modems for each use corresponding to each of the terminal interphone and terminal call modem, and these parts are connected with coaxial cables, etc. Was connected through. In addition, by interfacing with an interphone and a modem in this way, a voice communication path for each application is configured, and each voice communication path has a different frequency, for example, a frequency f1 for a voice communication path for dwelling units and a voice communication path for an elevator. Frequency f2, frequency f3 is assigned to the voice communication path for maintenance, and frequency f4 is assigned to the voice communication path for emergency broadcasting.
[0003]
[Problems to be solved by the invention]
However, in such a conventional voice call system, since a voice call path is configured for each use and a different channel frequency is allocated to each voice call path, it is necessary to multiplex the same number of frequencies as the interphone, Since the occupied frequency band increases, there is a problem that the frequency utilization efficiency is very poor. For example, when four intercoms for dwelling units, elevators, maintenance, and emergency broadcasting are provided, f1 to f4 are always used even though these intercoms are rarely used at the same time. The four frequency bands were occupied.
In addition, intercoms for specific uses on the terminal side and modems for terminal calls were able to talk to the center only through a different voice communication path from intercoms for other uses. When the phone becomes unusable due to a failure or maintenance work, the intercom for that purpose is completely disabled. Specifically, the dwelling unit intercom can talk only through a voice communication path composed of the telephone modem 1 and the terminal telephone modem 1, and if the telephone modem 1 or the terminal telephone modem 1 breaks down. It was no longer possible to make calls via the dwelling intercom. Therefore, there is a problem that safety and certainty in an emergency are lacking.
[0004]
In addition, since the voice communication path is configured for each application and different channel frequencies are assigned to each voice communication path, even if you want to make the same content call to multiple interphones on the terminal side, you must talk at different frequencies. did not become. For example, if you want to perform an emergency broadcast, you must send an emergency broadcast to the terminal intercom via the dwelling unit intercom at the center and then to the elevator intercom via the elevator intercom. There wasn't. Therefore, it is very time-consuming to broadcast simultaneously and lacks immediacy in an emergency.
Furthermore, since it is necessary to install the same number of intercom call modems etc. in the center as there are application-specific intercoms on the terminal side, it is necessary to take a large installation place, and the console etc. will be enlarged was there.
[0005]
[Means for Solving the Problems]
  In order to solve such problems in the conventional voice call system, the present invention as set forth in claim 1 is provided with an arbitrary number of interphones and a communication control device for controlling each interphone at the center. The communication control device includes an arbitrary number of voice modems assigned different frequencies, and each of a plurality of terminals provided on the terminal side has a plurality of terminal interphones and a terminal for controlling the terminal interphones A control device, and the terminal control device includes a voice modem having a number corresponding to each voice modem in the center and assigned with the same frequency as each corresponding voice modem, the center and each terminal; Are connected via a common coaxial cable constituting a frequency-multiplexed multi-channel transmission line, and each voice modem in the center is connected to the front. A plurality of voice communication paths connecting the center and the terminal are configured by a coaxial cable and each voice modem of the terminal, and the interphone of the center and the terminal interphone of the terminal are connected via the voice communication path In the voice call system, the communication control device of the center has the plurality of voice call paths when a terminal interphone requesting a call at the center is designated or when a call is requested from the terminal interphone to the center at the terminal.Among them, a voice communication path that recognizes an unused voice communication path, performs carrier detection for the voice modems of the center and terminals belonging to the unused voice communication path, and uses a voice communication path in which carrier detection is normally obtained for a call. AsA communication control unit that selects and generates a connection signal including communication path data indicating the selected voice communication path and terminal interphone data indicating the terminal interphone, and sends the connection signal to the terminal side; The terminal control device includes a terminal control unit for controlling each unit in the terminal control device, and a line connection circuit interposed between the terminal interphone and the voice modem, and the terminal control unit transmits from the center. The line connection circuit is controlled to connect the terminal interphone indicated by the terminal intercom data of the connection signal and the voice modem belonging to the voice communication path indicated by the communication path data when the connected connection signal is input It is configured as a feature.
[0006]
  Also, in the present invention described in claim 2, in the present invention described in claim 1, the communication control device includes a line switch interposed between the interphone and a voice modem, and the communication control The communication control unit of the apparatus, when a terminal interphone for requesting a call is specified in the center, or when a call request is made from the terminal interphone to the center in the terminal,Among them, a voice communication path that recognizes an unused voice communication path, performs carrier detection for the voice modems of the center and terminals belonging to the unused voice communication path, and uses a voice communication path in which carrier detection is normally obtained for a call. AsSelecting and generating a switching signal including communication path data indicating the selected voice communication path and center intercom data indicating the selected intercom, and sending the switching signal to the line switch. When a switching signal is input from the control unit, the connection control is performed between the interphone indicated by the center intercom data of the switching signal and the voice modem belonging to the voice communication path indicated by the communication path data.
[0008]
According to the present invention, when a terminal interphone for requesting a call is designated by the operation unit of the center, or when a call is requested from the terminal interphone to the center at the terminal, the terminal interphone becomes the common intercom at the center. It is connected via any of the above voice communication paths. Here, this voice communication path is selected by a predetermined procedure each time, and does not correspond to each intercom fixedly. Therefore, it is not necessary to assign a fixed frequency to each interphone, and the number of occupied frequencies is reduced.
[0009]
Furthermore, the common interphone of the center and the intercom of the terminal are connected via an arbitrary voice communication path by the line connection circuit and the line switch, so that the voice communication path can be shared. Therefore, even if a specific voice communication path becomes unusable, a call can be made via another voice communication path. Furthermore, by sharing the voice call path in this way, a voice call common to each intercom of the terminal can be performed simultaneously.
In addition, since the voice communication path is shared in this way, a common interphone at the center can be connected to an arbitrary interphone of the terminal. Therefore, since the center interphone can be shared without corresponding to the terminal interphone, the center interphone can be reduced.
In addition, the voice communication path can be shared, and the common intercom in the center can be connected to any interphone on the terminal. Therefore, even if one communication path of the intercom or voice modem becomes unavailable, all calls are separated. It can be secured on the voice call path.
[0010]
In addition, when a call request is issued from the center or the terminal, an unused call path is automatically selected by the communication control unit of the center, so that there is no problem with the call path already in use.
Furthermore, when there is a call request from the center or terminal, the voice communication path that is not used and the carrier detection is normally performed is automatically selected by the communication control unit of the center. It can be secured.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a block diagram showing the overall configuration of the present embodiment, and FIGS. 2 and 3 are enlarged views of the main part of FIG.
In each of these drawings, the present embodiment includes an arbitrary number of common interphones I1 to In and a communication control device 1 for controlling the common interphones I1 to In, and the like. Each of the ridges JT1 to JTn is equipped with an interphone for each application and a terminal control device C1 for controlling each interphone, and each part of the center and each part on the terminal side are connected by a coaxial cable 30 or the like. .
[0012]
First, the configuration on the terminal side will be described in detail.
In each of the residential buildings JT1 to JTn serving as the terminals, substantially similar systems are constructed. As a representative example, the system of the residence building JT1 will be described. As shown in FIG. 3, the system of the residence building JT 1 includes the dwelling unit intercoms J1 to Jn, the elevator intercom 25, the maintenance intercom 26, and the emergency broadcast intercom 27 (hereinafter, these intercoms are collectively referred to as “terminal intercoms”). ), An alarm device 28, and a terminal control device C1 for controlling each of these units.
[0013]
Each terminal interphone includes a transmitter for inputting an arbitrary audio signal and a receiver for outputting an audio signal sent from the center. Furthermore, a call buzzer for notifying that the call has been received from the center is also provided (the illustration of the transmitter, receiver and call buzzer is omitted).
The alarm 28 is a fire detector, a security detector, an emergency push button, etc. provided in the residence building JT1, or a housing information board provided in each dwelling unit to which these fire detectors are connected, and detects an abnormality. Then, an alarm signal is output.
[0014]
The terminal control device C1 is for controlling the terminal intercom. As shown in FIG. 3, the terminal control unit 20, the line connection circuit 21, the data communication modem 22, the voice modems M1 to Mn, the mixed duplexer 23, an alarm input unit 24, and an address setting unit 29.
The terminal control unit 20 controls each unit in the terminal control device C1, and performs analysis / execution of various signals transmitted from the center, generation of signals to be transmitted to the center, and the like.
The line connection circuit 21 is interposed between the terminal interphone and the voice modems M1 to Mn. The line connection circuit 21 receives a connection signal from the terminal control unit 20, and determines the terminal interphone (single or plural) depending on the content of the connection signal. No) and voice modems M1 to Mn are connected in any combination.
[0015]
The data communication modem 22 demodulates the control signal sent from the center via the coaxial cable 30 and sends it to the terminal control unit 20, and modulates the control signal sent from the terminal control unit 20 to a high frequency. And send it to the center.
The voice modems M <b> 1 to Mn demodulate the voice signal sent from the center via the coaxial cable 30 at a high frequency and send it to the terminal interphone via the line connection circuit 21. Also, the audio signal transmitted from the terminal intercom via the line connection circuit 21 is modulated to a high frequency and transmitted to the center.
The frequency to be demodulated / modulated is fixedly assigned to the data communication modem 22 and the voice modems M1 to Mn. Specifically, the frequency f0 is assigned to the data communication modem 22, and the frequencies f1 to fn are assigned to the voice modems M1 to Mn.
[0016]
Further, the mixer / demultiplexer 23 demultiplexes the control signal and audio signal transmitted from the center at the frequencies f0 to fn for each frequency, and transmits the demultiplexed signals to a modem corresponding to each frequency. For example, when a control signal of frequency f0 and an audio signal of frequency f1 are sent from the center, the control signal of frequency f0 is sent to the data communication modem 22, and the audio signal of frequency f1 is sent to the voice modem M1. To do. Alternatively, control signals and voice signals sent at various frequencies from the data communication modem 22 and voice modems M1 to Mn are mixed and sent to the center via the coaxial cable 30.
When the alarm input unit 24 inputs an alarm signal sent by an operation of an alarm 28 such as a fire detector or a house information panel or an emergency push button provided in an elevator, the content of the alarm signal is displayed. The indicated data is sent to the terminal control unit 20.
[0017]
Next, the configuration of the center will be described in detail.
As shown in FIG. 2, the center includes a monitor 2 and an operation unit 3 in addition to the common interphones I <b> 1 to In and the communication control device 1.
First, an arbitrary number of common interphones I1 to In are provided in the center, and are provided with a transmitter, a receiver, and a call buzzer, like the terminal interphone. Each of these common interphones I1 to In does not correspond to a specific interphone among the terminal interphones, but is used in common for each terminal interphone.
[0018]
In addition, the monitor 2 is arranged and state of each terminal intercom and alarm device 28 etc. provided in each of the residence buildings JT1 to JTn (distinguishing whether the terminal interphone is used or not used, display of the terminal intercom issuing a call request, alarm device The presence or absence of 28 alarms etc.) is illustrated on the screen by symbols and the like.
For example, the symbol of the terminal intercom in use is displayed in a color different from the symbol of the intercom in use. If there is a call request from the terminal intercom, the symbol of the terminal intercom is blinked. Alternatively, when an alarm signal is transmitted from the alarm device 28, the symbol of the alarm device 28 that transmitted this alarm signal is blinked in red. The display related to the terminal side devices is performed based on the control of the display control unit 4 described later.
[0019]
The operation unit 3 is used to instruct a terminal interphone to be used for a call when making a call request from the center to each terminal interphone on the terminal side. Specifically, a mouse pointer or the like is used. For example, the communication control unit 5 recognizes that an instruction to select a terminal interphone has been given by clicking a symbol of the terminal intercom displayed on the monitor 2 with the mouse pointer.
[0020]
Next, the communication control apparatus 1 that controls the common interphones I1 to In, the monitor 2, and the operation unit 3 will be described. As shown in FIG. 2, the communication control device 1 includes a display control unit 4, a communication control unit 5, a line switch 6, a data communication modem 7, voice modems TM1 to TMn, and a mixed demultiplexer 8. The
The display control unit 4 controls the display on the monitor 2 based on the control from the communication control unit 5.
The communication control unit 5 controls each unit of the communication control device 1 and performs analysis / execution of various signals sent from the terminal side, generation of signals sent to the terminal side, and the like.
The line switch 6 is interposed between the common interphones I1 to In and the voice modems TM1 to TMn. The line switch 6 receives a switching signal from the communication control unit 5, and the common interphones I1 to In depending on the contents of the switching signal. And voice modems TM1 to TMn are connected in any combination.
[0021]
The data communication modem 7 modulates the control signal sent from the communication control unit 5 to a high frequency and sends it to the terminal side, and demodulates the return signal sent from the terminal side via the coaxial cable 30 at a high frequency. It is sent to the communication control unit 5.
The voice modems TM1 to TMn modulate the voice signal sent from the common interphones I1 to In via the line switch 6 to a high frequency and send it to the terminal side. In addition, the audio signal transmitted at high frequency from the terminal side via the coaxial cable 30 is demodulated and transmitted to the common interphones I1 to In via the line switch 6.
[0022]
Here, the data communication modem 7 and the voice modems TM1 to TMn each have a fixed frequency corresponding to the data communication modem 22 and the voice modems M1 to Mn. Assigned. Specifically, the frequency f0 corresponding to the data communication modem 22 is assigned to the data communication modem 7, and the frequencies f1 to fn corresponding to the voice modems M1 to Mn are assigned to the voice modems TM1 to TMn. Are assigned to each.
[0023]
In this way, by assigning the same frequency to each of the voice modems M1 to Mn of the terminal and each of the voice modems TM1 to TMn of the center, it becomes possible to send and receive voice signals to each other, and a plurality of voice communication paths are formed. .
In other words, a first voice communication path having the frequency f1 assigned is formed between the voice modem M1 and the voice modem TM1, and the frequency f2 assigned to the frequency f2 is assigned between the voice modem M2 and the voice modem TM2. Two voice communication paths are configured. Similarly, an nth voice communication path assigned with the frequency fn is also formed between the voice modem Mn and the voice modem TMn. Therefore, n voice communication paths from 1 to n are configured.
[0024]
The mixer / demultiplexer 8 transmits control signals and audio signals transmitted from the data communication modem 7 and the audio modems TM1 to TMn at various frequencies to the terminal side from the coaxial cable 30 as mixed waves. Alternatively, the return signal and the audio signal transmitted from the terminal side at the frequencies f0 to fn are demultiplexed for each frequency and transmitted to the modem corresponding to each frequency.
The coaxial cable 30 can multiplex all the signals described so far, and constitutes a multiplexed multi-channel transmission line having at least frequencies f0 to fn.
[0025]
Next, the voice call operation according to this embodiment will be described.
In this voice call operation, there are a case where a call request is made from the center to the terminal side and a case where a call request is made from the terminal side to the center. First, a case where a call request is made from the center to the terminal side will be described.
For example, when calling the dwelling unit intercom J1 of the residence building JT1 from the center, the manager of the center first takes a common intercom (for example, the common intercom I1) that is not currently used from the common intercoms I1 to In, Click on the symbol of the dwelling unit intercom J1 on the monitor 2. By this click operation, the communication control unit 5 recognizes that the dwelling unit intercom J1 has been instructed.
[0026]
And the communication control part 5 selects the voice call path used for a telephone call from the 1st-nth voice call paths by the procedure set beforehand.
Here, what kind of procedure is the “preset procedure” will be described.
First, the communication control unit 5 recognizes an unused voice communication path among the first to nth voice communication paths. Specifically, the communication control unit 5 is provided with a state storage unit (not shown) for storing the current usage state of each terminal interphone, and each of the terminal interphones stored by the state storage unit is stored. By calling the current usage state, an unused voice communication path is recognized.
[0027]
Next, in order to check whether or not the plurality of unused voice communication paths recognized in this way (for example, the first to third voice communication paths) are faulty and cannot be used, Carrier detection is performed on the voice modems TM1 to TMn and the voice modems M1 to Mn belonging to the voice communication path, and only the voice communication path on which carrier detection is normally obtained is selected. Specifically, a modem capable of monitoring a carrier signal transmitted from each of the voice modems TM1 to TMn and the voice modems M1 to Mn to the first to nth voice communication paths and detecting the carrier signal. Recognize a normal voice communication path that is not disabled by identification.
[0028]
When a plurality of normal voice communication paths exist by these procedures (for example, the first and second voice communication paths), any one voice communication path is further selected. The first voice communication path is finally selected by presetting the priority order for selecting in the order of 1, 2, ..., n. It may be determined at random.
By selecting the voice communication path to be used from among the voice communication paths in which carrier detection is normally performed in this way, a voice communication path that can be normally used can be automatically selected, and a normal call state can be secured. .
[0029]
After the first voice communication path to be used for a call is selected through such an operation, the selected first voice communication path is connected to the common intercom I1 at the center and the dwelling unit intercom J1 at the residence building JT1. Is done.
Specifically, a control signal including speech path data indicating the selected first voice communication path, terminal intercom data indicating the dwelling unit intercom J1, and address data indicating the terminal control device C1 set by the address setting unit 29. Is generated by the communication control unit 5 and sent to the terminal side.
[0030]
In the terminal control unit 20 of each of the terminal control devices C1 to Cn on the terminal side, when a control signal is transmitted from the center, first, the address data included in this control signal is the address data set by the address setting unit 29, Whether they match is identified. If it is determined that they match, the data content of the control signal is analyzed and a connection signal is sent to the line connection circuit 21.
The line connection circuit 21 to which the connection signal is sent connects the dwelling unit intercom J1 indicated by the terminal intercom data and the voice modem M1 belonging to the first voice communication path indicated by the communication path data.
In this way, the first voice communication path selected by the communication control unit 5 is connected to the dwelling unit intercom J1. Also, the calling buzzer of the dwelling unit intercom J1 is sounded at the time of this connection.
[0031]
At the same time, the center performs an operation for connecting the selected first voice communication path and the common interphone I1.
Specifically, a switching signal including communication path data indicating the selected first voice communication path and center intercom data indicating the common intercom I1 is generated by the communication control unit 5 and sent to the line switch 6. .
The line switch 6 to which the switching signal has been sent connects the common interphone I1 indicated by the center intercom data to the voice modem TM1 belonging to the first voice call path indicated by the call path data.
In this way, the first voice communication path selected by the communication control unit 5 is connected to the common interphone I1.
[0032]
By such various operations, the communication control unit 5 selects the first voice communication path, and the first voice communication path is connected to the common intercom I1 and the dwelling unit intercom J1 to form a communication path. By taking the handset of the dwelling unit intercom J1, the common intercom I1 and the dwelling unit intercom J1 can talk.
In the present embodiment, the case where a plurality of common interphones I1 to In are provided has been described.
[0033]
When a call is to be made from the center to a plurality of interphones on the terminal side, the symbols of the plurality of terminal interphones may be clicked when the interphone is designated by the operation unit 3.
Then, after selecting the first voice communication path as described above, the communication control unit 5 generates a control signal including a plurality of terminal intercom data designated via the operation unit 3 and sends it to the terminal side.
The line connection circuit 21 to which the connection signal is transmitted by the terminal control unit 20 to which this control signal has been transmitted includes a plurality of terminal interphones indicated by the terminal interphone data of the connection signal and the first signal indicated by the communication path data of the connection signal. 1 is connected to a voice modem M1 belonging to one voice communication path. Other operations are the same as described above.
That is, an arbitrary voice communication path can be connected to a plurality of terminal interphones via the line connection circuit 21, and simultaneous broadcasting or the like can be performed to the plurality of terminal interphones via one common interphone at the center.
[0034]
Next, a case where a call request is made from the terminal side to the center will be described.
For example, consider a case where the center is called from the maintenance intercom 26 of the residence building JT1. A call request signal is sent from the maintenance intercom 26 to the terminal control unit 20 by lifting the transmission / reception unit of the maintenance intercom 26 or by further pressing an arbitrary call request button after the lift.
The terminal control unit 20 to which the call request signal has been sent waits for monitoring polling that is always performed from the communication control unit 5 of the center. To send.
[0035]
The communication control unit 5 to which the terminal intercom data indicating the maintenance intercom 26 is transmitted flashes the symbol of the maintenance intercom 26 displayed on the monitor 2 via the display control unit 4 and also displays an arbitrary call buzzer. Sounds to notify the center manager that a call request has been made from the maintenance intercom 26.
Then, the manager of the center who notices the notification takes a common interphone (for example, common interphone I1) that is not currently used among the common interphones I1 to In, and the symbol of the dwelling unit intercom J1 on the monitor 2 via the operation unit 3. Click.
[0036]
Thereafter, almost the same operation is performed as when a call is requested from the center to the terminal side. That is, after a voice communication path is selected by the communication control unit 5, a control signal and a switching signal including connection contents for connecting the selected voice communication path to a predetermined interphone on the terminal side and the center are generated, Each is sent to the line connection circuit 21 and the line switch 6 via the terminal control unit 20.
[0037]
A call operation when an abnormality occurs in the terminal-side elevator will be described.
When an abnormality occurs and an emergency push button provided in the elevator is pressed by the user, an alarm signal is sent to the terminal control unit 20 via the alarm input unit 24. Then, the terminal control unit 20 waits for monitoring polling from the center, and when monitoring polling is performed, the data indicating the contents of the alarm signal and the terminal intercom data indicating the elevator interphone 25 are added to the polling response signal and transmitted to the center.
[0038]
The communication control unit 5 of the center to which these data are transmitted flashes the symbol indicating the elevator intercom 25 displayed on the monitor 2 via the display control unit 4 and displays the contents of the alarm signal. A ringing buzzer is sounded to notify the manager of the center that the alarm device 28 has been pressed.
Then, the manager on the center side who notices the notification takes a common interphone (for example, common interphone I1) which is not currently used among the common interphones I1 to In, and connects the elevator intercom 25 on the monitor 2 via the operation unit 3. Click on the symbol.
Thereafter, substantially the same operation as when a call request is made from the center to the terminal side is performed, a voice call path is formed, and a call can be made.
In addition, when an alarm signal is sent from the alarm device 28 to the terminal control unit 20 via the alarm input unit 24, data indicating the content of the alarm signal is also sent to the center in the same manner. The contents are displayed.
In the present embodiment, an example in which a plurality of terminal intercoms and a terminal control device are provided in a plurality of residential buildings on the terminal side has been described, but these may be provided in an arbitrary building such as an office building instead of a residential building. In this case, the same effect can be obtained.
[0039]
【The invention's effect】
  As described above, according to the first aspect of the present invention, when a terminal interphone that requests a call is specified by the operation unit of the center, or when a call is requested from the terminal interphone to the center at the terminal, A terminal intercom is connected to the common intercom at the center via any of the above voice communication paths. Here, this voice communication path is selected by a predetermined procedure each time, and does not correspond to each intercom fixedly. Therefore, it is not necessary to assign a frequency to each interphone in a fixed manner, the number of occupied frequencies can be reduced, and the frequency utilization efficiency can be improved.Also, when there is a call request from the center or terminal, the voice communication path that is not used and the carrier detection is normally performed is automatically selected by the communication control unit of the center. Can be secured.
[0040]
According to the first aspect of the present invention, the common interphone of the center and the intercom of the terminal are connected via an arbitrary voice communication path by the line connection circuit and the line switch, and the voice communication path can be shared. Figured. Therefore, even if a specific voice communication path becomes unusable, a call can be made via another voice communication path, and the call can be reliably performed even in an emergency.
Furthermore, by sharing the voice call path in this way, a voice call common to the intercoms of the terminal can be performed at the same time, and broadcast in an emergency can be easily and quickly performed.
[0041]
In addition, according to the present invention, since the common interphone at the center can be connected to any interphone of the terminal, the central interphone can be shared without corresponding to the intercom of the terminal. Can be reduced. Alternatively, even if one communication path of an interphone or a voice modem becomes unusable, all calls can be secured on another voice communication path.
[Brief description of the drawings]
FIG. 1 is a block diagram showing the overall configuration of an embodiment of the present invention.
FIG. 2 is an enlarged view of a main part of the center of FIG.
FIG. 3 is an enlarged view of a main part on the terminal side in FIG. 1;
FIG. 4 is a block diagram showing a configuration of a center of a conventional voice call system.
FIG. 5 is a block diagram showing a configuration of a terminal side of a conventional voice call system.
[Explanation of symbols]
JT1-JTn residence building
C1-Cn terminal control device
M1 to Mn, TM1 to TMn Voice modem
J1-Jn Dwelling unit intercom
I1-In common intercom
1 Communication control device
2 Monitor
3 Operation part
4 Display controller
5 Communication control unit
6 Line switch
7,22 Modem for data communication
8,23 Mixed duplexer
20 Terminal control unit
21 Line connection circuit
24 Alarm input section
25 Elevator intercom
26 Intercom for maintenance
27 Emergency broadcast intercom
28 Alarm
30 Coaxial cable

Claims (2)

The center includes an arbitrary number of interphones and a communication control device for controlling each interphone, and the communication control device includes an arbitrary number of voice modems assigned with different frequencies, and is provided on the terminal side. Each of the plurality of terminals includes a plurality of terminal interphones and a terminal control device for controlling each of the terminal interphones, and the terminal control device has a number corresponding to each voice modem of the center and each corresponding terminal control device. A voice modem having the same frequency as the voice modem is provided, and the center and each terminal are connected via a common coaxial cable constituting a frequency-multiplexed multi-channel transmission line. The voice modem, the coaxial cable, and each voice modem of the terminal constitute a plurality of voice communication paths connecting the center and the terminal. Te, in voice communication systems for connecting the terminal interphone of the interphone and terminal of the center to be call over the voice communication path,
The communication control device of the center, when a terminal interphone for requesting a call is designated at the center or when a call request is made from the terminal interphone to the center at the terminal, among the plurality of voice communication paths , an unused voice communication path And the carrier for the voice modem of the center and the terminal belonging to the unused voice communication path is detected, and the voice communication path in which the carrier detection is normally obtained is selected to be used for the call and the selected voice A communication control unit for generating a connection signal including communication path data indicating a communication path and terminal intercom data indicating the terminal interphone and sending the connection signal to the terminal side;
The terminal control device of each terminal on the terminal side includes a terminal control unit for controlling each unit in the terminal control device, and a line connection circuit interposed between the terminal interphone and the voice modem, When the connection signal sent from the center is input, the control unit connects the terminal interphone indicated by the terminal intercom data of the connection signal and the voice modem belonging to the voice call path indicated by the call path data. A voice call system characterized by controlling a connection circuit. The communication control device includes a line switch interposed between the intercom and the voice modem,
The communication control unit of the communication control device uses an unused voice among the plurality of voice communication paths when a terminal interphone that requests a call is specified at the center or when a call is requested from the terminal interphone to the center at the terminal. Recognizes the communication path and performs carrier detection for the voice modems of the center and the terminal belonging to the unused voice communication path, and selects and selects the voice communication path for which the carrier detection is normally obtained for use in the call. Generating a switching signal including the communication path data indicating the voice communication path and the center intercom data indicating the selected intercom, and sending the switching signal to the line switch,
When the switching signal is input from the communication control unit, the line switch controls connection between the interphone indicated by the center intercom data of the switching signal and the voice modem belonging to the voice communication path indicated by the speech path data. The voice call system according to claim 1.

Images