JP2007194739A - Speech system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a speech system which can attain speech in an optimum sound volume independently of a wiring distance of telephone lines. <P>SOLUTION: Before starting a speech between an alarm monitor panel 5 and an indoor unit 2, the indoor unit 2 receives a training signal transmitted from the alarm monitor panel 5 via the telephone lines La. A sound volume adjustment section 30 of the indoor unit 2 calculates an amount of adjusting sound volume on the basis of a signal level of the training signal and increases/decreases a gain of a speaker amplifier 23b on the basis of the amount of adjustment to adjust the sound volume of received voice. Further, the indoor unit 2 notifies the alarm monitor panel 5 about the amount of adjustment, and a control section 50 of the alarm monitor panel 5 increases/decreases a gain of an amplifier 53a on the basis of the amount of adjustment notified from the indoor unit 2 to adjust the sound volume of the received voice. Thus, the speech in the optimum sound volume is achieved independently of the wiring distance of the telephone lines La between the alarm monitor panel 5 and the selected indoor unit 2 and saves the labor of manual adjustment of the sound volume in each indoor unit 2. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a call system in which a plurality of call devices connected by a call line transmit a voice signal to make a call.

As this type of call system, for example, a lobby interphone installed at a common entrance of an apartment house and capable of inputting and outputting voices, and installed at each dwelling unit of the apartment house and connected to the lobby interphone via a telephone line and lobby Provided with a plurality of dwelling units (interphone master unit, housing information panel, etc.) that establishes a communication path with the lobby intercom when a visitor selects a selection means (such as a numeric keypad) that the intercom has. In addition, an intercom system for collective housing has been conventionally provided which is configured to transmit a voice signal via a communication line between a lobby intercom and a dwelling unit of any dwelling unit (for example, Patent Documents). 1).
JP-A-6-14125

  By the way, in the above conventional example, the wiring distance of the telephone line connecting the lobby intercom and each dwelling unit is different for each dwelling unit. Especially in a high-rise apartment, the dwelling unit installed in the dwelling unit on the first floor The difference between the wiring distance to the machine and the wiring distance to the dwelling machine installed in the top floor dwelling unit may be several hundred meters to several kilometers. Here, since the audio signal transmitted through the telephone line increases transmission loss as the wiring distance increases, the call volume varies greatly between the dwelling unit with a short wiring distance and the dwelling unit with a long wiring distance. become. In order to correct such variations in sound volume, conventionally, the resident himself has to adjust the sound volume by operating a sound volume adjustment knob provided on the dwelling unit.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide a call system capable of making a call at an optimum volume regardless of the wiring distance of the call line.

  In order to achieve the above object, the first aspect of the present invention includes first and second call devices capable of inputting and outputting voices, and the first and second call devices communicate with each other via a call line. The first call device includes a voice input means for inputting voice, a voice output means for outputting voice, and a voice signal input from the voice input means via a call line. A voice signal transmission means for receiving and outputting a voice signal transmitted through a telephone line and outputting the voice signal to a voice output means; a control signal transmission / reception means for transmitting / receiving a control signal to / from the second call device; A training signal transmitting means for transmitting a training signal to the second call device via the telephone line, and a volume adjusting means for adjusting the volume of the audio signal output from the audio signal transmitting means to the audio output means, 2 telephone equipment A voice input means for inputting voice; a voice output means for outputting voice; and a voice signal input from the voice input means is transmitted through the telephone line and a voice signal transmitted through the telephone line is received. The sound signal transmitting means for outputting to the sound output means, the control signal transmitting / receiving means for transmitting / receiving the control signal to / from the first call device, and the volume of the sound signal output from the sound signal transmitting means to the sound output means are adjusted. A volume adjusting means that receives the training signal transmitted from the first call device, calculates a volume adjustment amount in the volume adjusting means based on the signal level of the training signal, and is calculated by the calculating means Control means for transmitting a control signal for notifying the adjustment amount from the control signal transmission means to the first call device. In the first call device, the control signal transmission means Volume control means adjusts the amount notified by the control signal to Shin and adjusting the volume.

  According to a second aspect of the present invention, in the first aspect of the present invention, an audio signal is connected to the first and second call devices via the call line, and between the first and second call devices via the call line. The third call device includes a voice input means for inputting voice, a voice output means for outputting voice, and a voice signal input from the voice input means as a call line. For transmitting and receiving a control signal between the first and second call devices, and a voice signal transmission means for receiving a voice signal transmitted via a telephone line and outputting it to a voice output means Controls signal transmission / reception means, volume adjustment means for adjusting the volume of the audio signal output from the audio signal transmission means to the audio output means, and a control signal for requesting the first call device to transmit a training signal First call device from signal transmission means Control means for transmitting to the first communication device, the training signal transmission means receives the training signal when the control signal transmission / reception means receives the control signal for the training signal transmission request transmitted from the third communication device. The third call device is characterized in that the volume adjusting means adjusts the volume by the adjustment amount notified by the control signal received by the control signal transmitting / receiving means.

  According to the first aspect of the present invention, the training signal transmitted from the first call device via the call line is received by the second call device before starting the call, and the training signal is received by the second call device. The volume adjustment unit calculates the volume adjustment amount based on the signal level of the signal, the volume adjustment unit adjusts the volume by the adjustment amount, and the adjustment amount is notified from the second call device to the first call device. In the call device, the volume adjusting means adjusts the volume with the adjustment amount notified from the second call device, so that the call can be made with the optimum volume regardless of the wiring distance of the call line, and each call There is no need to manually adjust the volume in the device.

  According to the invention of claim 2, the first call device transmits the training signal when receiving the control signal of the training signal transmission request transmitted from the third call device, and the third call device Since the volume adjusting unit adjusts the volume by the adjustment amount notified by the control signal transmitted from the second call device, the wiring distance of the call line also in the third call device that does not include the training signal transmission unit and the calculation unit Regardless of this, it is possible to talk at an optimum volume, and the cost of the entire system can be reduced.

  Hereinafter, embodiments in which the present invention is applied to an intercom system for an apartment house will be described in detail with reference to the drawings.

  FIG. 1 shows a configuration example of an intercom system for an apartment house according to an embodiment of the present invention. In the present embodiment, a lobby intercom 1 installed at a common entrance of an apartment house, a plurality of dwelling units 2 installed at each dwelling unit, and an alarm monitoring panel 5 installed at a management room of the apartment house are provided. The lobby intercom 1, the dwelling unit 2, and the alarm monitoring panel 5 are 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, an audio signal is transmitted between the lobby intercom 1 and the alarm monitoring panel 5 and the dwelling unit 2. Control for designating the telephone line La, the video line Lb for transmitting the video signal captured by the television camera 45 provided in the lobby intercom 1, and 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 signals. 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. .

  The lobby intercom 1 receives a microphone 40 and a speaker 41 that input and output audio, a microphone amplifier 42 that amplifies an audio signal (transmission signal) output from the microphone 40, and an audio signal (receiving signal) input to the speaker 31. A speaker amplifier 43 that amplifies, a transmission line on the receiving side and on the transmission side, and a two-line four-line conversion unit 44 that performs two-line to four-line conversion on a transmission line La, and a TV camera 45 that images a visitor A video processing unit 46 that modulates the frequency of the video signal output from the TV camera 45 and transmits the video signal via the video line Lb; an operation unit 47 that is a selection unit having a number key for designating a dwelling unit number and a call button; And a control unit 48 having a CPU as a main component, and a control signal transmission / reception unit 49 serving as an interface between the control unit 48 and the control line Lc. Become and to manipulate the call button after selecting the visited dwelling unit number by operating the number key that you have selected the dwelling unit 2 corresponding to the dwelling unit number. The dwelling unit number input from the operation unit 47 is transmitted from the control signal transmission / reception unit 49 to the alarm monitoring panel 5 via the control line Lc by the control unit 48, and the alarm monitoring panel 5 is sent to the dwelling unit 2 corresponding to the dwelling unit number. Then, a control signal (call command) is sent through the control line Lc. The speaker amplifier 43 is a variable amplifier having a variable gain (amplification degree), and the gain is adjusted by the control unit 48 as described later.

  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 a microphone amplifier 23a and a speaker amplifier 23b, respectively. However, the speaker amplifier 23b is composed of a variable amplifier whose gain (amplification degree) is variable, and the gain is adjusted by the volume adjusting unit 30 as described later. 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 video signal transmission path is connected to the video processing section 12, and the speech path is connected to the speech path switching section 16. The communication path switching unit 16 is installed in the same dwelling unit in a state in which the communication path connected to the 2-wire / four-line conversion unit 25 is connected to the main line interface unit 14 and a state in which it is connected to a handset interface unit 18 described later. It is alternatively switched to a state where it is connected to another dwelling unit (not shown).

  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 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 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 can be transmitted 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 and images the visitor captured by the TV camera 45 of the lobby intercom 1. 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 transmitted from the speaker 22. 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 can be switched to a state where it is connected to the main line interface unit 14 and a communication path is established between the lobby intercom 1 and only the communication between the lobby intercom 1 and the selected dwelling unit 2 can be made. In addition, it is possible to display a visitor imaged by the television camera 45 only on the selected dwelling unit 2 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 visitors imaged by the television camera on the monitor unit 13.

  On the other hand, 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, a call handset (handset) 52, Amplifiers 53a and 53b that amplify the transmission signal and the reception signal, a transmission line on the reception side and the transmission side, and a two-wire four-line conversion unit 54 that converts the two communication lines La into two lines and four lines, and control In response to an instruction from the unit 50, a training signal transmitting unit 55 that transmits a training signal to be described later, a state in which the transmission line on the transmission side of the two-wire / four-wire converting unit 54 is connected to the handset 52, and the training signal transmitting unit 55 A voice / training signal switching unit 56 that selectively switches to a connection state, and a state in which the voice / training signal switching unit 56 is connected to the call line La via the two-wire / four-line conversion unit 54 and two-wire four. A call / training signal switching unit 57 that selectively switches to a state of being connected to the call line La via the amplifier 58 without passing through the conversion unit 54, and the call line La and the trunk line control device 3 connected to the lobby intercom 1 And an open / close switch unit 59 inserted between the telephone line La and the telephone line La. 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. Further, at the time of such a call, the control unit 50 switches the voice / training signal switching unit 56 to a state in which the transmission line on the transmission side of the two-wire / four-line conversion unit 54 is connected to the handset 52 and also calls / training signal 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. Here, the amplifier 53a for amplifying the received signal is composed of a variable amplifier whose gain (amplification degree) is variable, and the gain is adjusted by the control unit 50 as described later.

  The training signal transmission unit 55 generates and outputs a training signal composed of a tone signal having a single frequency. The training signal is transmitted from the voice / training signal switching unit 56 through the call / training signal switching unit 57 to the amplifier 58. And then transmitted to each dwelling unit 2 via the telephone line La.

  Thus, in this embodiment, the alarm monitoring panel 5 installed in the management room corresponds to the first call device, and the dwelling unit 2 installed in each dwelling unit corresponds to the second call device, and is used at the common entrance. The installed lobby intercom 1 corresponds to a third call device. However, the lobby intercom 1 may be provided with a training signal transmission means to be a first communication device, and the training signal transmission unit 55 may be removed from the alarm monitoring panel 5 to be a third communication device.

  The volume adjusting unit 30 provided in the dwelling unit 2 adjusts the gain of the speaker amplifier 23b based on the signal level of the training signal received via the call line La. The volume of the received voice ringed from the speaker 22 is calculated by calculating the gain adjustment amount so as to compensate for the difference between the level and the reference level that provides an appropriate volume, and increasing or decreasing the gain of the speaker amplifier 23b according to the adjustment amount. Adjust. Note that the volume control 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.

  Next, in the present embodiment, each operation of the alarm monitoring panel 5 and the dwelling unit 2 when selecting any one of the dwelling units 2 from the alarm monitoring panel 5 and talking individually will be described. First, when any dwelling unit 2 is selected by a selection unit (not shown), the alarm monitoring panel 5 sends a control signal (call command) for calling the dwelling unit 2 selected by the control unit 50 to the control signal transmitting / receiving unit. 51 to the selected dwelling unit 2 via the control line Lc, and when the first predetermined time has elapsed from the completion of transmission of the control signal, the voice / training signal switching unit 56 is controlled to control the training signal. The transmission unit 55 is switched to a state where it is connected to the call / training signal switching unit 57 and the call / training signal switching unit 57 is switched to a state where it is connected to the call line La without going through the two-wire / four-wire conversion unit 54. A training signal is transmitted from the signal transmission unit 55.

  The control signal transmitted from the alarm monitoring panel 5 is received by the selected dwelling unit 2. In the dwelling unit 2 that has received the control signal, the main control unit 10 prepares for starting a call in response to the call command. That is, when the main control unit 10 operates the volume adjustment unit 30 and receives a training signal transmitted from the alarm monitoring panel 5 via the call line La, the main control unit 10 starts the calculation of the volume adjustment amount. When receiving the operation start instruction from the main control unit 10, the volume adjustment unit 30 measures the signal level of the training signal, calculates the volume adjustment amount according to the above-described procedure, and performs the main control on the calculation result (volume adjustment amount). Pass to part 10. The main control unit 10 notifies the alarm monitoring panel 5 of the volume adjustment amount by a control signal transmitted from the control signal transmitting / receiving unit 11 to the alarm monitoring panel 5 via the signal line Lc.

  In the alarm monitoring panel 5, the control signal transmission / reception unit 51 receives the control signal, and the notified volume adjustment amount is passed to the control unit 50. The control unit 50 increases the gain of the amplifier 53a based on the volume adjustment amount. Increase / decrease to adjust the volume of the received voice. Further, 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 second predetermined time has elapsed from the start of transmission, 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 / training signal switching unit 57. When the administrator makes a call using the handset 52 and the resident makes a call on the dwelling unit 2, the reception voice adjusted to an appropriate volume by the speaker amplifier 23b is sounded from the speaker 22 of the dwelling unit 2. From the handset 52 of the alarm monitoring board 5, the reception voice adjusted to an appropriate volume by the amplifier 53a is also sounded.

  Here, when the handset 52 is on-hooked to end the call, the control unit 50 of the alarm monitoring panel 5 sends a control signal (call end command) for instructing the end of the call from the control signal transmitting / receiving unit 51 to the control line Lc. After transmitting to the dwelling unit 2 via, returns to the standby state. In the dwelling unit 2 that has received the call end command, the main control unit 10 stops the call processing unit 24 and returns to the standby state.

  Next, each operation of the lobby intercom 1, the alarm monitoring panel 5, and the dwelling unit 2 when any one of the dwelling units 2 is selected from the lobby intercom 1 in the present embodiment and talking individually will be described. First, when the dwelling unit 2 corresponding to the dwelling unit number is selected by operating the call button after the visitor operates the number key of the operation unit 47 and selects the dwelling unit number to be visited, the lobby intercom 1 The dwelling unit number and the training signal transmission request input from the operation unit 47 are transmitted from the control signal transmission / reception unit 49 to the alarm monitoring panel 5 via the control line Lc. In the alarm monitoring panel 5, the control unit 50 sends a control signal (call command) for calling the dwelling unit 2 selected by the lobby intercom 1 from the control signal transmitting / receiving unit 51 to the dwelling unit 2 via the control line Lc. When the first predetermined time has elapsed since the transmission of the control signal is completed, 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 / training signal switching unit 57. At the same time, the call / training signal switching unit 57 is switched to a state where the call / training signal switching unit 57 is connected to the call line La without going through the two-wire / four-line conversion unit 54, and then a training signal is transmitted from the training signal transmission unit 55.

  And in the dwelling unit 2 that has received the control signal, the volume adjusting unit 30 measures the signal level of the training signal to calculate the volume adjustment amount, as in the case of a call between the alarm monitoring panel 5 and the dwelling unit 2. The calculation result (volume adjustment amount) is passed to the main control unit 10, and the main control unit 10 transmits a control signal for notifying the volume adjustment amount from the control signal transmitting / receiving unit 11 via the signal line Lc.

  In the alarm monitoring panel 5, the control signal transmitted from the dwelling unit 2 via the signal line is transferred from the control signal transmission / reception unit 51 to the lobby interphone 1, and the control unit 50 performs the second predetermined time from the start of transmission. The transmission of the training signal by the training signal transmission unit 55 is stopped, and the open / close switch unit 59 is closed to connect the call line La connected to the lobby intercom 1 to the call line La of the trunk line L1.

  On the other hand, in the lobby intercom 1, the control signal transmitted from the alarm monitoring panel 5 is received by the control signal transmission / reception unit 49, and the notified volume adjustment amount is transferred from the control signal transmission / reception unit 49 to the control unit 48. 48 adjusts the volume of the received voice by increasing or decreasing the gain of the speaker amplifier 43 based on the volume adjustment amount. When a visitor makes a call with the lobby intercom 1 and a resident makes a call with the dwelling unit 2, the reception voice adjusted to an appropriate volume by the speaker amplifier 23 b is sounded from the speaker 22 of the dwelling unit 2. From the speaker 41 of the intercom 1, the received voice that has been adjusted to an appropriate volume by the speaker amplifier 43 is sounded.

  As described above, according to the present embodiment, before starting a call between the alarm monitoring panel 5 as the first communication device and the dwelling unit 2 as the second communication device, the alarm line 5 The dwell unit 2 receives a training signal transmitted via the sound signal, and in the dwelling unit 2, the sound volume adjustment unit 30 that is the calculation means and the sound volume adjustment means calculates the volume adjustment amount based on the signal level of the training signal and The volume of the received voice is adjusted by increasing or decreasing the gain of the speaker amplifier 23b with the adjustment amount, and the adjustment amount is notified from the dwelling unit 2 to the alarm monitoring panel 5, and the alarm monitoring panel 5 notifies the dwelling unit 2 Since the control unit 50, which is a volume adjustment means, adjusts the volume of the received voice by increasing / decreasing the gain of the amplifier 53a according to the adjustment amount, regardless of the wiring distance of the call line La from the alarm monitoring panel 5 to the selected dwelling unit 2. In Can be calls optimal volume, moreover, there is an advantage that troublesome can be saved to manually adjust the volume in individual dwelling unit machine 2.

  Further, the alarm monitoring panel 5 as the first communication device transmits a training signal when receiving the control signal for the training signal transmission request transmitted from the lobby interphone 1 as the third communication device. Since the control unit 48, which is a volume adjusting means, adjusts the volume of the received voice by increasing / decreasing the gain of the speaker amplifier 43 by the adjustment amount notified by the control signal transmitted from the dwelling unit 2 as the second call device, the training signal Even in the lobby intercom 1 that does not include a transmission means or a calculation means, it is possible to make a call at an optimal volume regardless of the wiring distance of the call line La to the selected dwelling unit 2, and the configuration of the lobby intercom 1 is simplified. Since this is possible, there is an advantage that the cost of the entire system can be reduced. Here, the management room in which the alarm monitoring panel 5 is installed is arranged in the vicinity of the common entrance where the lobby intercom 1 is installed, and the wiring distance of the communication line La connecting the alarm monitoring panel 5 and the lobby intercom 1 ( Because it can be regarded as being sufficiently short compared to the wiring distance (maximum 2 km to 3 km) of the communication line La + L1 connecting the alarm monitoring panel 5 and each dwelling unit 2, the lobby intercom as described above. Even if the volume adjustment amount is calculated based on the training signal transmitted from the alarm monitoring board 5 instead of 1, it can be adjusted to an appropriate volume.

It is a system configuration figure showing an embodiment of the present invention.

Explanation of symbols

1 Lobby intercom (third call device)
2 dwelling unit (second call device)
5 Alarm monitoring panel (first call device)
22 Speaker 23b Speaker amplifier 30 Volume adjustment unit 50 Control unit 52 Handset 53a Amplifier 55 Training signal transmission unit La Call line Lc Signal line

Claims (2)

A call system comprising first and second call devices capable of inputting and outputting voice, wherein the first and second call devices transmit a voice signal to each other via a call line, and make a call.
The first call device transmits a voice input means for inputting voice, a voice output means for outputting voice, and a voice signal inputted from the voice input means via the call line and also sent via the call line. A voice signal transmission unit that receives a voice signal and outputs it to a voice output unit, a control signal transmission / reception unit that transmits / receives a control signal to / from the second call device, and a training for the second call device via the call line Training signal transmission means for transmitting a signal, and volume adjustment means for adjusting the volume of the audio signal output from the audio signal transmission means to the audio output means,
The second call device transmits a voice input means for inputting voice, a voice output means for outputting voice, and a voice signal inputted from the voice input means via the call line and also sent via the call line. An audio signal transmission unit that receives an audio signal and outputs it to the audio output unit, a control signal transmission / reception unit that transmits / receives a control signal to / from the first call device, and an output from the audio signal transmission unit to the audio output unit Volume adjustment means for adjusting the volume of the audio signal; calculation means for receiving a training signal transmitted from the first call device and calculating a volume adjustment amount in the volume adjustment means based on a signal level of the training signal; Control means for transmitting a control signal for notifying the adjustment amount calculated by the calculation means to the first call device from the control signal transmission means,
In the first call device, a call system characterized in that the volume adjusting means adjusts the volume by an adjustment amount notified by the control signal received by the control signal transmitting / receiving means. A third call device that is connected to the first and second call devices via the call line and transmits voice signals to and from the first and second call devices via the call line;
The third call device transmits a voice input means for inputting voice, a voice output means for outputting voice, and a voice signal input from the voice input means via the call line and also sent via the call line. Audio signal transmission means for receiving an audio signal and outputting it to audio output means, control signal transmission / reception means for transmitting / receiving a control signal between the first and second call devices, and from the audio signal transmission means to the audio output means Volume control means for adjusting the volume of the output audio signal, and control means for transmitting a control signal for requesting the first call device to transmit a training signal from the control signal transmission means to the first call device. And
In the first communication device, the training signal transmission unit transmits the training signal when receiving the control signal of the training signal transmission request transmitted from the third communication device by the control signal transmission / reception unit,
3. The call system according to claim 1, wherein in the third call device, the volume adjustment unit adjusts the volume by an adjustment amount notified by the control signal received by the control signal transmission / reception unit.

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