JP4613679B2 - Intercom system for housing complex - Google Patents

Description

  The present invention is an assembly that enables communication by alternatively establishing a communication path between a common unit device installed at a common entrance of an apartment house and any one of the dwelling units installed in each dwelling unit. With regard to residential intercom systems, in particular, in addition to individual calls in which a common unit device and one dwelling unit make a one-on-one call, a plurality of dwelling units are provided by a simultaneous broadcasting device installed in a common unit or a manager's room of an apartment house. The present invention relates to an intercom system for collective housing that can broadcast audio to the machine all at once.

Conventionally, a common unit (lobby intercom) installed at the common entrance of an apartment house and capable of voice input and output, and a common unit installed at each dwelling unit of an apartment house are connected via a transmission line and shared. A plurality of dwelling units (such as an interphone master unit and a housing information panel) that establish communication paths with the shared unit device when a visitor selects a selection means (such as a numeric keypad) that the unit device has. A doorphone handset installed in each dwelling unit of a housing complex and connected via a cordless handset connection line to a dwelling unit, and transmitted to each dwelling unit installed in a common area or a manager's room of a housing complex There is provided an intercom system for collective housing provided with a simultaneous broadcasting device that is connected via a track and broadcasts audio to all or some of the dwelling units at once (for example, see Patent Document 1). .
JP-A-6-14125

  By the way, some contents of broadcasts are not urgent, while others are urgent, such as notifications at the time of disasters and evacuation guidance. When a broadcast with urgency is performed when the value is set low, there is a possibility that the sound may not reach the resident's ear because the sound is not broadcast at a sufficient volume from the speaker of the dwelling unit.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an intercom system for a collective housing in which the volume of the broadcast broadcasted from the speaker of the dwelling unit can be increased or decreased by the broadcast apparatus. is there.

In order to achieve the above object, the first aspect of the present invention provides a common unit device installed at a common entrance of a housing complex and capable of inputting / outputting sound, and a common unit device installed at each dwelling unit of the housing complex. Multiple dwelling units that establish a communication path with the common unit when connected by a visitor and are selected by a visitor operating the selection means of the common unit and connected to the common unit. And a broadcasting device that is connected to each dwelling unit and is connected to each dwelling unit via a transmission line and broadcasts sound to all or all dwelling units at the same time. It consists of a control line that transmits a control signal that occurs in response to the operation of the selection means and instructs the start of an individual call, and a signal line that transmits an audio signal. The dwelling unit connects the signal line to the common unit device. Calling means for making calls via At least a speaker for sounding the broadcast sound, an individual call / broadcast switching means for selectively switching between a state in which the signal line is connected to the calling means and a state in which the speaker is connected, and an individual call / broadcast switching means And a speaker for correcting the volume of the broadcast, and a controller for controlling the individual call / broadcast switching means based on a control signal transmitted through the control line. The apparatus instructs by the instruction means for instructing the volume of the broadcast broadcast ringing through the speaker of the dwelling unit, the control signal transmission means for transmitting the control signal instructing the start of the broadcast via the control line, and the instruction means. And a control means for transmitting the broadcast signal volume from the control signal transmission means including the control signal. In each dwelling unit, when the control signal instructing the start of the broadcast is received, the control means individually Volume adjusting means so that the signal line by controlling the call / broadcast broadcast switching means becomes the volume of the broadcast simultaneously instructed by the control signal with shifted in a state of connecting to the speaker is to correct the sound volume, sound volume correcting means Is an amplifier that amplifies the audio signal of the broadcast, a power estimation unit that estimates the signal power of the signal transmitted to the transmission line from the broadcast device to the dwelling unit, and a preset reference value of the signal power Is divided by the estimated value of the signal power estimated by the power estimation unit, and an amplification degree calculation unit that calculates the amplification degree of the amplifier. The reference value of the signal power is increased or decreased according to the volume .

  According to the first aspect of the present invention, the volume increasing / decreasing means of each dwelling unit increases or decreases the volume of the simultaneous broadcasting so that the volume of the broadcasting is instructed by the instruction unit of the simultaneous broadcasting apparatus. The volume of the broadcast can be increased or decreased by the broadcast device. For example, when a resident broadcasts with urgency when the volume level of the speaker of the dwelling unit is set low, the sound of the dwelling unit is heard. The volume of the broadcast broadcast can be increased and the broadcast can be surely heard from the residents.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  An example of the system configuration of this embodiment is shown in FIG. In the present embodiment, a common unit device (lobby intercom) 1 installed at a common entrance of an apartment house and a plurality of dwelling units 2 installed in each dwelling unit are provided. It is connected via a transmission line. The transmission line includes a trunk line L1 connected to the lobby intercom 1 and a branch line L2 connected to each dwelling unit 2. Further, the trunk line control device for distributing the trunk line L1 to a plurality of systems (not shown). 3 is provided. As this transmission line, a multi-pair twisted pair cable having three or more pairs in the sheath is used. In the illustrated example, a communication line La that transmits an audio signal between the lobby intercom 1 and the dwelling unit 2; A video line Lb for transmitting a video signal captured by a television camera (not shown) provided in the lobby intercom 1 and a control signal for designating the dwelling unit 2 selected by the selection means (described later) of the lobby intercom 1 A pair line is used for each of the control lines Lc for transmitting. That is, the transmission line of the illustrated example uses three pairs of pair wires. Here, the video signal transmitted through the video line Lb is frequency-modulated by the lobby intercom 1 and is demodulated by the video processing unit 12 provided in each dwelling unit 2 and displayed on the monitor unit 13 as will be described later. .

  Although not shown, the lobby intercom 1 includes a microphone and a speaker for inputting / outputting sound, a TV camera for imaging a visitor, a selection key having a number key for designating a dwelling unit number and a call button, and When the caller is operated after the person operates the number key and selects the visited unit number, the dwelling unit 2 corresponding to the unit number is selected. Here, a simultaneous broadcasting device (alarm monitoring panel) 5 is connected to the lobby intercom 1 via the communication line La and the control line Lc, and the dwelling unit number selected on the lobby intercom 1 is alerted via the control line Lc. When transmitted to the monitoring board 5, the alarm monitoring board 5 sends a control signal (call command) to the dwelling unit 2 corresponding to the dwelling unit number via the control line Lc.

  On the other hand, the dwelling unit 2 includes a microphone 21 and a speaker 22 that input and output audio, and the microphone 21 and the speaker 22 are connected to the call processing unit 24 via amplifiers 23a and 23b, respectively. Also connected to the call processing unit 24 is a two-wire / four-wire conversion unit 25 for converting the transmission paths on the reception side and the transmission side and the two-line communication line La into two-wire / four-wires through amplifiers 26a and 26b. ing. The call processing unit 24 compares the level of the voice signal (received signal) transmitted via the call line La and the level of the voice signal (transmitted signal) output from the microphone 21 to compare the call state (received state or transmitted state). When a call state is estimated, a loss is inserted into the transmission path of the transmission signal, and when a transmission state is estimated, a loss is inserted into the transmission path of the reception signal. And an echo canceler for eliminating acoustic echo generated by acoustic coupling between the microphone 21 and the speaker 22. However, since such voice switches and echo cancellers are well known in the art, detailed illustration and description of the configuration and operation are omitted. Therefore, an audio signal can be exchanged between the lobby intercom 1 and the dwelling unit 2 through the communication line La. A visitor uses the lobby intercom 1 and a resident uses the dwelling unit 2 so that the visitor and the residence Voice calls can be made with a person.

  Further, in the dwelling unit 2, the communication line La and the video line Lb of the branch line L2 are respectively connected to a transmission path (hereinafter referred to as “call path”) and a video signal transmission path. (Hereinafter referred to as “video path”) A main line interface unit 14 is provided. The video path is connected to the video processing unit 12, and the call path is connected to the call / broadcast switching unit 15. The call / broadcast switching unit 15 selectively switches between a state where the speech path connected to the trunk interface unit 14 is connected to the speech path switching unit 16 and a state where the speech path is connected to a volume correction unit 30 which will be described later. It is. Further, the communication path switching unit 16 is the same as the state in which the communication path connected to the two-wire / four-line conversion unit 25 is connected to the telephone / broadcast switching unit 15 and the state in which the communication path is connected to the handset interface unit 18 described later. It selectively switches between a state of connection to another dwelling unit (not shown) installed in the dwelling unit.

  The door phone slave unit 6 is connected to the slave unit interface unit 18 connected to the speech path switching unit 16 via the slave unit connection line L3. The door phone sub-unit 6 is disposed at the entrance of each dwelling unit of the apartment house and includes a microphone and a speaker. Therefore, when the speech path switching unit 16 is switched to a state in which the speech path connected to the 2-wire 4-wire conversion unit 25 is connected to the slave unit interface unit 18, between the doorphone slave unit 6 and the dwelling unit 2. Is possible. Further, the door phone slave unit 6 is provided with a television camera, and the slave unit interface unit 18 separates the audio signal and the video signal transmitted via the slave unit connection line L3, and the separated video signal is transmitted via the transmission line. It can be output to the video processing unit 12 and displayed on the monitor unit 13. Furthermore, the door phone sub unit 6 is provided with a call button, and has a function of sending a call signal to the sub unit connection line L3 when the call button is operated, and the dwell unit 2 has a notification sound when the call signal is detected. The ringing tone generated by the generation unit 27 is transmitted from the speaker 22.

  In the dwelling unit 2, a liquid crystal display or a CRT is used for the monitor unit 13. The video signal input to the dwelling unit 2 through the video line Lb is balanced-unbalanced converted by the main line interface unit 14, further amplified by an amplifier, and then frequency demodulated by the video processing unit 12. The video signal input to the dwelling unit 2 through the slave unit connection line L3 is also balanced-unbalanced converted by the slave unit interface unit 18, further amplified by an amplifier, and then frequency-demodulated by the video processing unit 12. The video signal output from the video processing unit 12 is input to the monitor unit 13, thereby displaying a video on the screen of the monitor unit 13. That is, since the image of the visitor imaged in the TV camera of the lobby intercom 1 or the door phone slave unit 6 is displayed on the monitor unit 13 of the dwelling unit 2, the resident in the dwelling unit can confirm the visitor. is there.

  In addition, the notification sound generation unit 27 generates a notification sound for notification of a call from the lobby intercom 1 or the door phone slave unit 6 and outputs the generated notification sound to the speaker 5 via the amplifier 28a and the notification sound. Is output as a back tone to the branch line L2 or the slave unit connection line L3. That is, the back tone transmission path switching section 17 is connected to the notification sound generation section 27 via the amplifier 28b, and the back tone transmission path switching section 17 selects the back tone transmission destination as the branch line L2 and the slave unit connection line. Alternatively, it is switched to L3.

  The dwelling unit 2 is provided with a main control unit 10 that controls the internal circuit with a CPU as a main component, and the main control unit 10 is connected to a control signal transmission / reception circuit 11 serving as an interface with the control line Lc. The control signal transmission / reception circuit 11 has a function of transmitting the control signal output from the main control unit 10 to the control line Lc and delivering the control signal received from the control line Lc to the main control unit 10.

  By the way, the branch line L2 is branched from the trunk line L1 via the branching device 7, and the trunk line control apparatus 3 directly connects the trunk lines L1 of each system. Therefore, the control signal sent from the lobby intercom 1 is transmitted to all the dwelling units 2 connected to the control line Lc. Here, an address (for example, a dwelling unit number) is individually set in the main control unit 10 of the dwelling unit 2, and a control signal (call command) for designating an address is selected by selecting the address in the lobby intercom 1. It is possible to transmit from the alarm monitoring panel 5 to all the dwelling units 2 via the control line Lc. If the address included in the control signal is its own address, the main control unit 10 of the dwelling unit 2 activates the video processing unit 12 and the monitor unit 13 to display the video of the visitor captured by the camera of the lobby intercom 1 The notification sound (calling sound) generated by the notification sound generation unit 27 is transmitted from the speaker 22 while being displayed on the monitor unit 13 of the machine 2. When the resident presses a response button (not shown) of the dwelling unit 2 in response to the ringing tone, the main control unit 10 controls the call / broadcast switching unit 15 and is connected to the main line interface unit 14. The communication path is switched to a state where it is connected to the communication path switching unit 16 and the communication path switching unit 16 is controlled to connect the communication path connected to the two-wire / four-line conversion unit 25 to the calling / broadcast switching unit 15. By switching to the state and establishing a communication path with the lobby intercom 1, it is possible to make a call only between the lobby intercom 1 and the selected dwelling unit 2, and the selected dwelling unit 2 It is possible to display the visitor imaged by the camera only on the monitor unit 13. When the dwelling unit 2 selected in the lobby intercom 1 establishes a communication path with the lobby intercom 1, the end of the call using an appropriate operation button is detected in the lobby intercom 1 or dwelling unit 2. Then it ends.

  When the call button of the door phone slave unit 6 is pressed and a call signal is sent to the slave unit connection line L3, the main control unit 10 of the dwelling unit 2 that has detected the call signal causes the video processing unit 12 and the monitor unit 13 to detect the call signal. Is displayed on the monitor unit 13 of the dwelling unit 2 and the notification sound (ringing sound) generated by the notification sound generation unit 27 is displayed on the speaker 22. To send. When the resident presses a response button (not shown) of the dwelling unit 2 in response to the ringing tone, the main control unit 10 controls the call / broadcast switching unit 15 and is connected to the main line interface unit 14. The communication path is switched to a state where it is connected to the communication path switching section 16 and the communication path switching section 16 is controlled so that the communication path connected to the 2-wire 4-wire conversion section 25 is connected to the slave interface section 18. By switching and establishing a communication path between the doorphone slave unit 6 and making a call between the doorphone slave unit 6 and the dwelling unit 2, it is possible to monitor a visitor imaged by a TV camera. It is possible to display on the part 13.

  On the other hand, the alarm monitoring panel 5 is installed in a manager's room of an apartment house, etc., and has a function of calling and broadcasting to each dwelling unit 2 via the call line La, and each dwelling unit via the control line Lc. 2 has a function for instructing the start and end of broadcast. For example, when performing broadcast to all the dwelling units 2 from the alarm monitoring panel 5, a control signal (simultaneous broadcast start command) instructing the start of the broadcast from the alarm monitoring panel 5 is sent to each dwelling unit via the control line Lc. In each dwelling unit 2 that has been transmitted to the machine 2 and received this control signal, the main control unit 10 controls the call / broadcast switching unit 15 in response to the broadcast start command, and the call connected to the main line interface unit 14 The communication path is established with the alarm monitoring board 5 by switching the path to the state connected to the volume correction unit 30, and a broadcast audio signal (hereinafter referred to as "broadcast audio signal") sent from the alarm monitoring board 5 is established. Is transmitted to each dwelling unit 2 via the communication line La. In each dwelling unit 2, the volume correction unit 30 automatically corrects the volume of the broadcast audio signal, and the volume-corrected broadcast audio signal is sent from the speaker 22.

  In this embodiment, the alarm monitoring panel 5 includes a control unit 50 having a CPU as a main component, a control signal transmission / reception circuit 51 serving as an interface between the control unit 50 and the control line Lc, and a handset (handset) 52 for calling. And amplifiers 53a and 53b that amplify the transmission signal and the reception signal, and a two-wire four-wire conversion unit 54 that performs two-wire four-line conversion between each transmission path on the reception side and the transmission side and two communication lines La. A training signal transmission unit 55 that transmits a training signal to be described later in response to an instruction from the control unit 50, a state in which the transmission line on the transmission side of the two-wire four-wire conversion unit 54 is connected to the handset 52, and a training signal transmission unit The voice / training signal switching unit 56 and the voice / training signal switching unit 56 that are selectively switched to the state of being connected to 55 are connected to the call line La via the two-wire / four-line conversion unit 54. A call / broadcast switching unit 57 for selectively switching between a state and a state of being connected to the call line La via the amplifier 58 without passing through the two-wire / four-line converter 54, and a call line connected to the lobby intercom 1 Open / close switch 59 inserted between La and the telephone line La connected to the trunk line control device 3, number keys and call buttons for designating dwelling unit numbers, and volume setting for setting the volume of simultaneous broadcasting And an operation unit 60 having a switch. Then, if the administrator selects the dwell unit 2 corresponding to the dwelling unit number by operating the call button after selecting any dwelling unit number by operating the number key of the operation unit 60, the selected dwelling unit 2 and A communication path is formed between the two and the handset 52 can make a call only with the dwelling unit 2. In such a call, the control unit 50 switches the voice / training signal switching unit 56 to a state where the transmission line on the transmission side of the two-wire / four-wire conversion unit 54 is connected to the handset 52 and also calls / broadcast switching unit 57. Is switched to a state in which the voice / training signal switching unit 56 is connected to the call line La via the 2-wire 4-wire conversion unit 54, and the open / close switch unit 59 is opened to disconnect the lobby intercom 1 from the main line L1.

  The training signal transmission unit 55 generates and outputs a training signal having a characteristic in which a spectrum is uniformly distributed over a wide band like white noise (white noise). / Amplified by the amplifier 58 via the simultaneous broadcast switching unit 57 and then transmitted to each dwelling unit 2 via the communication line La.

FIG. 2A is a block diagram showing a specific configuration of the sound volume correction unit 30. The volume correction unit 30 in the present embodiment is a transmission loss estimation unit that estimates a transmission loss of the call line La from the alarm monitoring panel 5 to the dwelling unit 2 based on a training signal received via the call line La; Transmission loss compensation means for compensating for the loss due to the transmission loss estimated by the transmission loss estimation means for the broadcast audio signal. The transmission loss compensation means includes an amplifier 39 that amplifies the broadcast audio signal, and the transmission loss estimation means includes a power estimation unit 40 that estimates the signal power (instantaneous power) of the input signal (training signal) X (n); An amplification degree calculation unit 41 that calculates the amplification degree G of the amplifier 39 based on the signal power Ps of the training signal estimated by the power estimation unit 40. The power estimation unit 40 includes an absolute average value calculation unit 401 for obtaining a time average value (absolute average value) P _{X (n)} of the absolute value of the input signal X (n), as shown in FIG. The absolute average value smoothing unit 402 smoothes the time-series absolute average value P _{X (n)} calculated by the value calculating unit 401.

  The absolute average value calculation unit 401 frequency-discriminates an input signal X (n) sampled at a predetermined sampling time, and absolute value calculation for obtaining an absolute value of the input signal X (n) after frequency discrimination. Unit 401b, a division unit 401c that divides the absolute value of input signal X (n) by a predetermined time frame (sampling number M), and the sum of absolute values of input signal X (n) divided by sampling number M. The absolute sum calculation unit 401 performs the calculation of the following equation (1).

  The absolute average value smoothing unit 402 multiplies the absolute average value Px (n) by a positive constant α (<1), a delay shift register 402b, and an instantaneous power estimation delayed by the delay shift register 402b. It consists of a multiplier 402c that multiplies the value Ps (n-1) by a positive constant (1-α), and an adder 402d that adds the outputs of the two multipliers 402a and 402c. The smoothing unit 402 performs the calculation of the following equation (2).

  Further, the amplification degree calculation unit 41 calculates the amplification degree G (= Pr / Ps) by dividing the preset reference value Pr of the signal power by the estimated value Ps of the signal power estimated by the power estimation unit 40. The calculated amplification degree G is set in the amplifier 39.

  Next, in the present embodiment, the operation of the alarm monitoring panel 5 and each dwelling unit 2 when performing simultaneous broadcasting to the plurality of dwelling units 2 from the alarm monitoring panel 5 will be described with reference to the flowchart of FIG. First, when an administrator presses a broadcast start button (not shown) provided on the operation unit 60 of the alarm monitoring panel 5 at the start of the broadcast (step S11), the control unit 50 in the alarm monitoring panel 5 A control signal (broadcast start command) instructing the start of broadcast is transmitted from the control signal transmission / reception unit 51 to each dwelling unit 2 via the control line Lc, and a predetermined time has elapsed since the completion of transmission of the control signal. Then, the voice / training signal switching unit 56 is controlled to switch the training signal transmission unit 55 to a state where it is connected to the call / broadcast switching unit 57 and the call / broadcast switching unit 57 is connected via the two-wire / four-line conversion unit 54. After switching to the state of connecting to the call line La, the training signal is transmitted from the training signal transmitter 55 (step S12).

  The control signal transmitted from the alarm monitoring panel 5 is received by all the dwelling units 2 that are the target of simultaneous broadcasting. In the dwelling unit 2 that has received the control signal, the main control unit 10 prepares for the start of broadcast in response to the broadcast start command. That is, the main control unit 10 controls the call / broadcast switching unit 15 to switch the communication path connected to the main line interface unit 14 to a state in which it is connected to the volume correction unit 30 so that the training signal can be received. At the same time, the sound volume correction unit 30 is operated (step S21), and when a training signal transmitted from the alarm monitoring panel 5 via the communication line La is received, transmission loss estimation processing is started. In the volume correction unit 30, upon receiving an operation start instruction from the main control unit 10, the power estimation unit 40 estimates the signal power of the input signal X (n), and the estimated value Ps (n) exceeds a predetermined threshold value. Sometimes it is determined that a training signal has been received (step S22), and an estimated value Ps (n) after a predetermined time has elapsed from the time when the training signal was received is used as the signal power Ps of the training signal (steps S23 and S24), and the amplification factor is calculated The unit 41 sets the amplification degree G obtained by dividing the reference value Pr by the signal power Ps in the amplifier 39 (step S25).

  In the alarm monitoring panel 5, the control unit 50 stops the transmission of the training signal by the training signal transmission unit 55 after a predetermined time has elapsed from the start of transmission (step S13), and further controls the voice / training signal switching unit 56 to control the handset 52. Is switched to a state of being connected to the call / broadcast switching unit 57. Then, if the administrator performs a broadcast using the handset 52 (step S14), the broadcast audio signal output from the handset 52 is transmitted from the voice / training signal switching unit 56 via the call / broadcast switching unit 57. Sent to line La. The broadcast broadcast audio signal transmitted from the alarm monitoring panel 5 via the call line La is input from the main line interface unit 14 to the volume correction unit 30 via the call / broadcast switching unit 15 and amplified by the amplifier 39. As a result, the sound volume is corrected, and the broadcast sound is output from the speaker 22 at an appropriate sound volume (step S26).

  When the handset 52 is on-hooked to end the broadcast (step S15), the control unit 50 of the alarm monitoring panel 5 transmits and receives a control signal (broadcast end command) for instructing the end of the broadcast. After transmitting from the unit 51 to each dwelling unit 2 via the control line Lc, the open / close switch unit 59 is closed to return to the standby state. Further, in the dwelling unit 2 that has received the control signal, the main control unit 10 stops the operation of the volume correction unit 30 and controls the call / broadcast switching unit 15 to connect the communication path connected to the main line interface unit 14. The state is switched to the state of connection to the speech path switching means 16, and the standby state is restored.

  Here, the operation unit 60 of the alarm monitoring panel 5 is provided with a volume setting switch for setting the volume of the broadcast broadcast sent from the speaker 22 of the dwelling unit 2 in a plurality of stages (for example, large, medium, and small). The manager operates the volume setting switch when the broadcast starts, and the volume of the broadcast is set to an appropriate level according to the content (for example, “medium” or “ Set to “Small” or “Large” for urgent matters. When the broadcast volume is set in this way, the control unit 50 of the alarm monitoring panel 5 calls the set value of the broadcast volume (hereinafter referred to as “volume indication value”) in the control signal (broadcast start command). ) To the dwelling units 2 from the control signal transmitting / receiving unit 51 via the control line Lc.

  On the other hand, the main control unit 10 of the dwelling unit 2 increases or decreases the signal power reference value Pr based on the volume instruction value included in the control signal received from the alarm monitoring panel 5, that is, if the volume instruction value is “medium”. For example, the reference value Pr is left as the initial value. If the sound volume instruction value is “low”, the reference value Pr is decreased from the initial value. If the sound volume instruction value is “high”, the reference value Pr is increased from the initial value. . As a result, the amplification degree G of the amplifier 39 calculated by the amplification degree calculation unit 41 of the volume correction unit 30 is increased or decreased according to the volume instruction value, so that the volume of the broadcast can be increased or decreased to a level according to the volume instruction value. Become. That is, in this embodiment, the volume setting switch provided in the operation unit 60 of the alarm monitoring panel 5 corresponds to the instruction unit, and the amplification degree calculation unit 41 constituting the volume correction unit 30 of the dwelling unit 2 corresponds to the volume increase / decrease unit. To do.

  As described above, according to the present embodiment, the volume increasing / decreasing means (amplification degree calculation unit 41) of each dwelling unit 2 is set so as to achieve the volume of the broadcast broadcast instructed by the instruction means (volume setting switch) of the alarm monitoring panel 5. In order to increase / decrease the volume of the broadcast, the volume of the broadcast broadcasted from the speaker 22 of the dwelling unit 2 can be increased / decreased by the alarm monitoring panel 5, for example, the resident sets the volume level of the speaker 22 of the dwelling unit 2 low. When urgent broadcasts are performed during the operation, the volume of the broadcast broadcasts from the speaker 22 of the dwelling unit 2 can be increased so that the resident can hear the broadcasts reliably.

It is a system configuration figure showing an embodiment of the present invention. (A) is a block diagram of a sound volume correction unit, and (b) is a block diagram of a power estimation unit. It is a flowchart for demonstrating the operation | movement at the time of simultaneous broadcasting same as the above.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Lobby intercom 2 Dwelling unit 5 Alarm monitoring panel 21 Microphone 22 Speaker 30 Volume correction part 60 Operation part

Claims (1)

The common unit device that is installed at the common entrance of the apartment house and can input and output voice, and the common unit device that is installed in each dwelling unit of the apartment house is connected via a transmission line and the selection unit that the common unit device has Are selected by the visitor's operation, multiple dwelling units that establish a communication path with the common unit device, and each dwelling unit installed in the common unit or manager's room of the apartment house is a transmission line And a broadcast device that broadcasts audio to all or some of the dwelling units at the same time,
The transmission line comprises at least a control line that transmits a control signal that is generated in accordance with the operation of the selection means and instructs the start of an individual call, and a signal line that transmits an audio signal.
The dwelling unit has a calling means for making a call through the signal line with the shared device, a speaker for sounding at least a broadcast sound, a state in which the signal line is connected to the calling means, and a state in which the speaker is connected to the speaker. Individual call / broadcast switching means for selectively switching, volume correction means provided between the individual call / broadcast switching means and the speaker for correcting the volume of the broadcast, and control transmitted via the control line Control means for controlling the individual call / broadcast switching means based on the signal,
The broadcast apparatus includes an instruction means for instructing the volume of the broadcast broadcasted by a speaker of the dwelling unit, a control signal transmission means for transmitting a control signal for instructing the start of the broadcast via a control line, and an instruction means. Including a control means for transmitting from the control signal transmission means including the volume of the broadcast broadcast to be instructed in the control signal,
In each dwelling unit, when the control signal instructing the start of the broadcast is received, the control means controls the individual call / broadcast switching means to switch the signal line to the speaker and is instructed by the control signal. The volume correction means corrects the volume so that it becomes the volume of the broadcast, and the volume correction means is transmitted to an amplifier that amplifies the audio signal of the broadcast and a transmission line from the broadcast apparatus to the dwelling unit. A power estimation unit that estimates the signal power of the signal to be amplified, and an amplification factor calculation that calculates the amplification factor of the amplifier by dividing a preset reference value of the signal power by the estimated signal power value estimated by the power estimation unit and a section, the amplification degree calculation unit, collective housing intercom, characterized in that to increase or decrease the reference value of the signal power according to the magnitude of the volume of the simultaneous broadcast instructed by the control signal Stem.

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