JP4821508B2 - 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 all at once (for example, Patent Document 1 or Reference).
JP-A-6-14125 JP 2003-16557 A

  By the way, depending on the size of the housing complex, the length of the transmission line from the simultaneous broadcasting device to each dwelling unit may range from several hundred meters to several kilometers, and the number of connected dwelling units and the trunk line equipment (common unit device) And the number of broadcast devices) vary depending on the size of the housing complex, so the transmission loss of the transmission line due to the impedance of the wiring, dwelling unit, and trunk line equipment also deteriorates, and the volume of the broadcast in the dwelling unit decreases. There was a problem that the sound volume varied between the dwelling units. Note that the decrease in volume can be dealt with by amplifying the broadcast audio signal, but it is not possible to suppress the variation in volume between individual dwelling units. Here, “transmission loss” is defined as a change in the amplitude and phase of the received signal with respect to the transmission signal and the amount of change between the two points in the transmission system (between the simultaneous broadcasting device and each dwelling unit in the above example). Is done.

  In addition, when external noise is superimposed on the audio signal for broadcast transmitted from the broadcast device to each dwelling unit, there is a problem that it is difficult to hear the broadcast broadcast sound in each dwelling unit.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to suppress a variation in the volume of a broadcast broadcast among a plurality of dwelling units and to reduce the influence of noise transmitted from a speaker. It is to provide an intercom system for collective housing.

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. A plurality of dwelling units that establish a communication path with the shared unit when connected by a visitor and are selected by a visitor operating the selection means that the shared unit has A door phone cordless handset installed in each dwelling unit via a cordless handset connection line connected to a dwelling unit, and connected to each dwelling unit installed in a common area or manager's room of an apartment via a transmission line And a broadcast device that broadcasts audio to all or some of the dwelling units at the same time, and the transmission line transmits a control signal that is generated in response to the operation of the selection means and instructs the start of an individual call. Control line to transmit and voice The dwelling unit sounds at least a broadcast sound with a communication means for making a call through the signal line and the slave unit connection line with the common unit device and the door phone slave unit respectively. Speaker, broadcast signal switching means for selectively switching between a state where the signal line is connected to the call means and a state where the signal line is connected to the speaker, and a simultaneous call switching means provided between the individual call / broadcast switching means and the speaker. Each dwelling unit is provided with a volume correction means for correcting the volume of the broadcast to a value within a predetermined range, and a control means for controlling the individual call / broadcast switching means based on a control signal transmitted through the control line. In this mode, a control signal for instructing the start of broadcast is transmitted via the control line, and when the control signal is received, the control means controls the individual call / broadcast switching means to connect the signal line to the speaker. A collective housing intercom system for shifting to, simultaneously broadcasting apparatus includes a training signal transmitting means for transmitting a training signal via a signal line, the sound volume correcting means, the training signal received via the signal line Transmission loss estimation means for estimating the transmission loss of the signal line route from the broadcast device to the dwelling unit based on the transmission loss compensation for compensating the transmission loss estimated by the transmission loss estimation means for the broadcast broadcast audio signal And a silence interval attenuating means for attenuating the input signal while detecting the silence interval of the input signal including the audio signal for simultaneous broadcasting and detecting the silence interval. While the signal is detected, the attenuation amount of the input signal is gradually increased to a predetermined value, and the transition time required to increase the attenuation amount to the predetermined value is transmitted. The transmission loss estimated by the transmission loss estimation means is shortened as the transmission loss increases.

  According to the first aspect of the present invention, each dwelling unit is equipped with volume correction means for correcting the volume of the simultaneous broadcast so that it falls within a predetermined range. Without adjusting the amplification level of the broadcast audio signal in the broadcast device according to the wiring length to the unit, it is possible to suppress the variation in the volume of the broadcast broadcast between multiple dwelling units, and in the volume correction means Since the silence interval attenuating means detects the silence interval of the input signal including the broadcast broadcast audio signal and attenuates the input signal while detecting the silence interval, noise other than the broadcast broadcast audio signal is amplified. And the influence of noise transmitted from the speaker can be reduced. Furthermore, since the transition time required for the silent section attenuating means to increase the attenuation amount to a predetermined value is shortened as the transmission loss estimated by the transmission loss estimating means increases, the transition from the voiced section to the silent section is performed. In addition, it is possible to suppress the increase of noise by the transmission loss compensation means and to easily listen to the broadcast.

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

  The structural example of the intercom system for apartment houses 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 signal Lb for transmitting a video signal picked up by a 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 are provided. A pair line is used for each control line Lc to be transmitted. 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 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 call button is operated after the number key is operated to select the visited unit number, the 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. A main line interface unit 14 is provided. The transmission path of the video signal is connected to the video processing unit 12, and the communication 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. Further, the door phone slave unit 6 is provided with a call button, and has a function of sending a call signal to the slave 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 by the 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. .

  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 22 via the amplifier 28a. 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 a control signal transmission / reception unit 11 that is an interface with the control line Lc is connected to the main control unit 10. The control signal transmission / reception unit 11 has a function of sending 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 (calling sound) generated by the notification sound generation unit 27 is output from the speaker 22. Send it out. 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 speech path switching unit 16 to connect to the 2-line 4-line conversion unit 25. The communication path between the doorphone slave unit 6 and the dwelling unit 2 can be communicated by switching the communication path thus established to a state where it is connected to the slave unit interface unit 18 and establishing a communication path with the doorphone slave unit 6. It is possible to display the visitor imaged by the camera on the monitor unit 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.

  As shown in FIG. 1, the alarm monitoring panel 5 includes a control unit 50 having a CPU as a main component, a control signal transmission / reception unit 51 serving as an interface between the control unit 50 and the control line Lc, and a telephone handset (handset) ) 52, amplifiers 53a and 53b for amplifying the transmission signal and the reception signal, and a two-line four-line conversion unit that performs two-line four-line conversion between the transmission line on the reception side and the transmission side and the two-line communication line La. 54, 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 the training signal A state in which the voice / training signal switching unit 56 and the voice / training signal switching unit 56 are switched selectively to the state of connection to the transmission unit 55 and the call line La via the two-wire / four-line conversion unit 54. And a call / broadcast switching unit 57 for selectively switching to a state of being connected to the call line La via the amplifier 58 without going through the two-wire / four-line converter 54, and a call line La connected to the lobby intercom 1 And an open / close switch unit 59 inserted between the telephone line La connected to the main line control device 3. Although not shown, the alarm monitoring panel 5 is provided with a number key for designating a dwelling unit number and a selection means having a call button, and an administrator operates the number key to select any dwelling unit number. If the dwell unit 2 corresponding to the dwelling unit number is selected by operating the call button after selection, a communication path is formed between the selected dwelling unit 2 and only the dwelling unit 2 is connected to the dwelling unit 2 by the handset 52. You can make a call. 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 composed of a tone signal of a single frequency. The training signal is transmitted from the voice / training signal switching unit 56 through the call / broadcast switching unit 57 to the amplifier 58. And then transmitted to each dwelling unit 2 via the telephone line La.

Volume correction unit 30 estimates transmission loss of call line La from alarm monitoring panel 5 to dwelling unit 2 based on the training signal received via call line La as shown in FIG. Loss estimation means, transmission loss compensation means for compensating for the loss due to transmission loss estimated by the transmission loss estimation means for the broadcast audio signal, and detecting the silent section while detecting the silent section of the input signal X (n) During this time, a silent section attenuating section 42 for attenuating the input signal X (n) and a means (switch 43) for inputting the training signal to the transmission loss estimating means without passing through the silent section attenuating section 42 are provided. The transmission loss compensation means includes an amplifier 39 for amplifying the broadcast audio signal, and the transmission loss estimation means includes a power estimation unit 40 for estimating 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 volume correction unit 30 in the present embodiment is realized by controlling the hardware of a DSP (digital signal processor) together with the call processing unit 24 and the notification sound generation unit 27 by software, but is not limited thereto. However, a CPU may be used instead of the DSP, or an analog circuit or a digital circuit may be used.

  The absolute average value calculation unit 401 performs frequency discrimination of the input signal X (n) sampled at a predetermined sampling time, and absolute value calculation for obtaining the absolute value of the input signal X (n) after frequency discrimination. Unit 401b, a dividing unit 401c that divides the absolute value of the input signal X (n) by a predetermined time frame (sampling number M), and a sum of absolute values of the input signal X (n) divided by the sampling number M The absolute sum calculator 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 divides the preset reference value Pr of the signal power by the estimated value Ps (n) of the signal power estimated by the power estimation unit 40 to obtain the amplification degree G (= Pr / Ps). And the calculated amplification degree G is set in the amplifier 39.

  The silent section attenuating unit 42 detects a section where the signal level of the input signal X (n) is less than a predetermined value as a silent section, a section where the signal level is equal to or higher than a predetermined value as a voiced section, and detects a voiced section. In the meantime, the attenuation is 0 dB, and when a silent section is detected, the attenuation gradually increases from 0 dB to LdB (> 0 dB) in transition time Tm seconds (m = 1, 2,...) As shown in FIG. Then, the input signal X (n) is attenuated (see the solid line in FIG. 3). When the silent section continues, the silent section attenuating unit 42 fixes the attenuation amount to L dB and attenuates the input signal X (n), and immediately returns the attenuation amount to 0 dB when the sound section is detected (FIG. 3). (See dashed line). Further, the silent section attenuating section 42 shortens the transition time Tm as the transmission loss estimated by the transmission loss estimating means (the amplification degree G calculated by the amplification degree calculating section 41) increases (T2 <T1). That is, when the transmission loss is relatively large, the amplification degree G also increases, and noise (such as external radiation noise or dwelling unit 2) that is present in the silent section when moving from the voiced section to the silent section. Generated noise and so on) may be greatly amplified by the amplifier 39, making it difficult to hear the broadcast sound. However, if the transition time Tm is shortened as the amplification degree G increases as described above, It is possible to easily listen to the broadcast by suppressing the increase of the noise component when shifting from the sound section to the silent section. A changeover switch 43 that selectively switches between a state in which the input signal X (n) is input to the power estimation unit 40 and a state in which the input signal X (n) is input to the silence interval attenuation unit 42 is input to the silence interval attenuation unit 42 and the power estimation unit 40. Provided on the side.

  Next, the operation of the alarm monitoring panel 5 and each dwelling unit 2 when performing simultaneous broadcasting from the alarm monitoring panel 5 to a plurality of dwelling units 2 in the present embodiment will be described with reference to the flowchart of FIG. First, when the administrator presses a broadcast button (not shown) provided on the alarm monitoring panel 5 at the start of the broadcast (step S11), the control unit 50 starts the broadcast in the alarm monitoring panel 5. When a control signal to be instructed (broadcast start command) is transmitted from the control signal transmission / reception unit 51 to each dwelling unit 2 via the control line Lc, and further, when the first predetermined time has elapsed since the completion of transmission of the control signal The voice / training signal switching unit 56 is controlled to switch the training signal transmission unit 55 to a state in which the training signal transmission unit 55 is connected to the call / broadcast switching unit 57 and the call / broadcast switching unit 57 does not go through the two-wire / four-line conversion unit 54. After switching to the state of connection to the call line La, a 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 if a training signal transmitted from the alarm monitoring board 5 via the communication line La is received, transmission loss estimation processing is started. In the volume correction unit 30, when the operation start instruction is received from the main control unit 10, the changeover switch 43 is switched from the silent section attenuation unit 42 to the power estimation unit 40. Then, the power estimation unit 40 estimates the signal power of the input signal X (n), determines that the training signal is received when the estimated value Ps (n) exceeds a predetermined threshold (step S22), and performs training. The estimated value Ps (n) after the second predetermined time has elapsed from the time of signal reception is used as the signal power Ps of the training signal (steps S23 and S24), and the amplification degree calculation unit 41 divides the reference value Pr by the signal power Ps. The amplification degree G obtained in this way is set in the amplifier 39 (step S25). After the amplification degree G is set in the amplifier 39, the changeover switch 43 is switched from the power estimation unit 40 to the silent section attenuation unit 42.

  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 the third predetermined time has elapsed from the start of transmission (step S13), and further controls the voice / training signal switching unit 56. The handset 52 is switched to a state where it is connected to the call / broadcast switching unit 57. Then, if the administrator broadcasts 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 to the call / broadcast switching unit 57 and the amplifier 58. And sent to the telephone 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).

  Then, the handset 52 may be on-hooked to end the broadcast. When the handset 52 is hooked on (step S15), the control unit 50 of the alarm monitoring panel 5 sends a control signal (broadcast end command) for instructing the end of the broadcast from the control signal transmitting / receiving unit 51 via the control line Lc. After transmission to each dwelling unit 2, the open / close switch 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.

  As described above, according to the present embodiment, each dwelling unit 2 includes the volume correction unit 30 that corrects the volume of the broadcast by the amplification degree calculation unit 41 so as to be approximately equal to the reference value Pr. Depending on the number of dwelling units 2 and the wiring length to each dwelling unit 2, the broadcast signal (alarm monitoring panel 5) can be used to adjust the amplification level of the audio signal for broadcast, or to the wiring length during construction Accordingly, it is possible to suppress the variation in the volume of the simultaneous broadcasting between the plurality of dwelling units 2 without taking the trouble of adjusting the impedance of the transmission line for each dwelling unit 2. Moreover, in the sound volume correction unit 30, the silence interval attenuating unit 42 detects the silence interval of the input signal X (n) including the audio signal for simultaneous broadcasting and the input signal X (n) while detecting the silence interval. Therefore, noise other than the broadcast audio signal can be prevented from being amplified by the amplifier 39, and the influence of noise transmitted from the speaker 22 can be reduced. Furthermore, since the transition time Tm required for the silent section attenuation unit 42 to increase the attenuation amount to a predetermined value is shortened as the transmission loss estimated by the transmission loss estimation means increases, the transition from the voiced section to the silent section is performed. In this case, it is possible to suppress an increase in noise by the transmission loss compensation means (amplifier 39) and to easily listen to the broadcast simultaneously.

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 operation | movement explanatory drawing of the sound volume correction | amendment part in the same as the above. It is a flowchart for demonstrating the operation | movement at the time of simultaneous broadcasting same as the above.

Explanation of symbols

1 Lobby intercom (common equipment)
2 dwelling units 5 Alarm monitoring panel (broadcasting equipment)
21 Microphone 22 Speaker 30 Volume correction part 42 Silent section attenuation 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 When a visitor is selected by operating the unit, multiple units that establish a communication path with the common unit device, and each unit connected to the unit in the housing complex are connected to a handset for calls. The doorphone slave unit connected via the line and each dwelling unit installed in the common area or manager's room of the apartment house are connected via a transmission line and all or all dwelling units are simultaneously With a broadcast device that broadcasts audio,
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 between the common unit device and the door phone slave unit via a signal line and a slave unit connection line, a speaker for sounding at least a broadcast sound, and a signal line as a calling means. Individual call / broadcast switching means for selectively switching between a connection state and a state of connection to a speaker, and the volume of the simultaneous broadcast provided between the individual call / broadcast switching means and the speaker falls within a predetermined range. Volume correction means for correcting as described above, and control means for controlling the individual call / broadcast switching means based on the control signal transmitted through the control line,
In each dwelling unit, a control signal instructing the start of broadcast is transmitted via the control line, and when the control signal is received, the control means controls the individual call / broadcast switching means and connects the signal line to the speaker. An intercom system for collective housing that is switched to a state of
The broadcast apparatus has a training signal transmitting means for transmitting a training signal via a signal line,
The volume correction means includes a transmission loss estimation means for estimating a transmission loss of a signal line path from the broadcast apparatus to the dwelling unit based on a training signal received via the signal line, and a broadcast broadcast audio signal. Transmission loss compensation means for compensating the transmission loss estimated by the transmission loss estimation means, and a silent section for detecting a silent section of an input signal including a broadcast broadcast audio signal and attenuating the input signal while detecting the silent section Attenuating means,
The silence interval attenuating means gradually increases the attenuation amount of the input signal to a predetermined value while the silence interval is detected, and the transition time required to increase the attenuation amount to the predetermined value is determined by the transmission loss estimation means. An intercom system for collective housing, which is shortened as the estimated transmission loss increases.

Images