JP6436741B2 - Apartment house intercom system - Google Patents

Description

  The present invention relates to an apartment house intercom system installed in an apartment house, and more particularly to an apartment house intercom system including a relay amplifier that amplifies a signal and corrects an attenuation amount in a trunk line from a control device to each room unit.

In an apartment house intercom system installed in an apartment house, since the transmission line is long, particularly a signal having a high frequency has a large attenuation. Therefore, a relay amplifier that amplifies the signal is provided in the middle of the transmission line. For example, as disclosed in Patent Document 1, a relay amplifier is provided in the middle of a transmission line for a video signal having a large attenuation rate by FM modulation and transmission compared to a low-frequency audio signal or control signal. By installing and amplifying, it can handle a long distance from the entrance hall to the living room.
Further, in a collective housing intercom system in which all signals are digitized and data signals are transmitted, since all signals are attenuated, audio signals and control signals are also amplified by a relay amplifier in addition to video signals. In this case, in addition to the down signal transmitted to the room machine, the up signal transmitted from the room machine to the control device is also amplified (see, for example, Patent Document 2).

JP 2002-165018 A JP 2014-68309 A

Compared to analog signals, digital signals can increase the amount of signal that can be transmitted, so intercom systems that digitize and transmit all video signals, audio signals, and control signals are becoming more popular. As described in Patent Document 2, the amplification factor of the obtained relay amplifier is controlled so that the output of the downstream signal and the upstream signal becomes a constant value.
Therefore, if a relay amplifier is installed near the control device, the received signal level of the control device may increase and peak out may occur.In this case, a circuit for shaping a distorted waveform may be added, It was necessary to reduce the signal level with an attenuator or the like.

  Accordingly, in view of such problems, the present invention provides a collective housing intercom system including a relay amplifier in which the signal level received by the control device is an appropriate level even if the relay amplifier is installed near the control device. The purpose is to do.

In order to solve the above-mentioned problems, the invention of claim 1 includes a collective entrance machine for a visitor to select a dwelling unit and call a resident, a living room machine for a resident to respond to the call, and a collective entrance machine. And a living room unit, and a control device that controls communication between devices, and a plurality of relay amplifiers that amplify the main line signal on the main line connecting the control unit and the room unit. An interphone system, wherein the relay amplifier includes a downstream signal amplification circuit that amplifies a downstream signal transmitted from the control device toward the room unit, and an upstream signal amplification circuit that amplifies the upstream signal transmitted from the room device toward the control device has the door, is closest to the installed a relay amplifier of at least the control device, the attenuation of the mains between the signal level of the downlink signal received, the latest equipment and itself has sent the downlink signal to the own To estimate And amount estimating section, an uplink output variable amplifier der having an uplink amplification factor setting unit for setting a gain of the uplink signal amplification circuit based on the attenuation amount information which the attenuation evaluating unit has estimated is, attenuation evaluating unit The output level of the latest device that has transmitted the received downlink signal is stored, and the attenuation value is estimated by comparing the stored value with the signal level of the received downlink signal .
According to this configuration, the relay amplifier closest to the control device estimates the attenuation amount of the downlink signal transmitted from the control device, and sets the amplification factor of the uplink signal amplification circuit with reference to the attenuation amount. Therefore, even if the relay amplifier is arranged near the control device, the control device can receive the upstream signal transmitted from the room unit at an appropriate level, and the control device can receive a waveform shaping circuit, an attenuator / AGC amplifier, etc. There is no need to provide hardware. In addition, since the relay amplifier installed at least near the control device does not amplify the signal more than necessary, the power consumption of the collective housing intercom system can be suppressed.

According to a second aspect of the present invention, in the configuration according to the first aspect, the uplink output variable amplifier is configured such that the output of the downlink signal amplifier circuit is a predetermined constant level based on the signal level information of the downlink signal detected by the attenuation amount estimation unit. And a downstream amplification factor setting unit for setting the amplification factor of the downstream signal amplification circuit.
According to this configuration, since the amplification factor is set based on the information obtained by the attenuation estimation unit in the downlink signal amplification circuit, an independent gain control circuit is not necessary. Therefore, the hardware of the relay amplifier can be simplified and downsized, and can be configured at low cost.

According to a third aspect of the present invention, in the configuration according to the first or second aspect, the uplink amplification factor setting unit is configured to generate an uplink signal amplification circuit with a predetermined constant amplification factor if the estimated attenuation is within a predetermined range. When the estimated amount of attenuation exceeds a predetermined range, the upstream signal amplifier circuit is operated at a higher gain than the fixed gain. The upstream signal amplifier circuit is operated at an amplification factor.
According to this configuration, when the estimated attenuation amount is larger than the predetermined range, the amplification factor is increased, and when the estimated attenuation amount is small, the amplification factor is decreased. Therefore, the device that receives the uplink signal transmitted from the relay amplifier reaches the relay amplifier. A signal can be received at a constant level regardless of the length of the trunk line.

  According to the present invention, the relay amplifier closest to the control device estimates the attenuation amount of the downlink signal transmitted from the control device, and sets the amplification factor of the uplink signal amplification circuit with reference to the attenuation amount. Therefore, even if the relay amplifier is arranged near the control device, the control device can receive the upstream signal transmitted from the room unit at an appropriate level, and the control device can receive a waveform shaping circuit, an attenuator / AGC amplifier, etc. There is no need to provide hardware. In addition, the relay amplifier installed at least near the control device can suppress power consumption because the uplink signal amplifier circuit does not amplify the signal more than necessary.

It is a block diagram which shows an example of the apartment house intercom system which concerns on this invention. It is a circuit block diagram of a relay amplifier. 4A and 4B are diagrams for explaining the operation of the relay amplifier. FIG. 4A shows a case where the attenuation amount of the signal transmitted from the control device is large, and FIG. 5B shows a case where the attenuation amount of the signal transmitted from the control device is small.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments embodying the present invention are described in detail below with reference to the drawings. FIG. 1 is a block diagram showing an example of a collective housing intercom system according to the present invention. 1 is a collective entrance for a visitor to select a dwelling unit to call a resident, and 2 is for a resident to answer the call. 3 is a management room that is installed in the manager's room to communicate with visitors and residents, 4 is a control device for controlling communication / call between devices, and 5 amplifies the received signal. An output relay amplifier 6 is a dwelling unit adapter for connecting the room unit 2 to the main line.

The collective entrance machine 1 and the management room machine 3 are connected to the control device 4 via transmission lines L1 and L2, respectively, and the room unit 2 is connected to the control device 4 via the trunk line L3. The relay amplifier 5 is installed at an appropriate part of the trunk line L3.
Note that on the main line L3, all of the audio signal, the video signal, and the control signal are converted into digital signals and transmitted, and high-frequency signals are transmitted on the down and up lines of the main line. The relay amplifier 5 amplifies all the audio signals, video signals, and control signals. Of the relay amplifier 5, 5a has a branching function.

In addition to the function of making a call, the collective entrance 1 includes an operation unit 11 that selects and calls a dwelling unit, a camera 12 that images a visitor, a display unit 13 that displays call destination information, and the like.
In addition to the function of making a call, the room unit 2 includes a call button 21 that receives a call and performs a response operation, a display 22 that displays a captured image of the camera 12, and the like.
The control device 4 controls the transmission of the calling signal, voice signal, control signal, connection / disconnection of the speech path, transmission of the video signal captured by the camera 12, and the like to a certain level for each connected device. Send a signal with.

The relay amplifier 5 amplifies the downstream signal transmitted from the control device 4 to the room device 2 so that the output becomes a predetermined level, but the upstream signal transmitted from the room device 2 to the control device 4 is amplified. Is an upstream output variable amplifier that changes the output level according to the situation.
FIG. 2 shows the relay amplifier 5 (5a) closest to the control device 4 among the relay amplifiers 5, and its circuit block. In FIG. 2, 51 is a downstream signal amplifier circuit that amplifies downstream signals, 52 is an upstream signal amplifier circuit that amplifies upstream signals, and each is composed of an AGCAMP having a gain changing function. A gain control unit 53 controls the gains of both amplifier circuits 51 and 52. The branch circuit is omitted.

The gain control unit 53 detects the signal level input to the downlink signal amplification circuit 51 and sends the attenuation amount of the trunk line L3, that is, the nearest device (here, the control device 4) that has transmitted the downlink signal toward itself. Attenuation amount estimation unit 53a that estimates the attenuation amount of main line L3a between and a downlink amplification factor setting unit 53b that detects the output level of downlink signal amplification circuit 51 and performs feedback control so that the output is output at a predetermined level And an upstream gain setting unit 53c that receives the attenuation amount information estimated by the attenuation amount estimation unit 53a and sets the gain of the upstream signal amplification circuit 52.
Reference numerals 55a to 55d are amplification circuits for amplifying signals by a predetermined amount, and reference numerals 56a to 56d are filter circuits for removing noise and removing unnecessary band components.

In the attenuation amount estimation unit 53a, the output signal level of the control device 4, which is a device closest to the upstream side of the installed trunk line L3, is input and stored in advance. This stored value is compared with the signal level of the received downlink signal to estimate the attenuation. In addition, the signal output level to the trunk line L3 of the control device 4 is constant, and by storing this level, the attenuation amount estimation unit 53a can estimate the attenuation amount of the trunk line L3 between the upstream nearest device and itself. .
Then, the uplink amplification factor setting unit 53c sets the amplification factor of the uplink signal based on this attenuation amount information.

The uplink amplification factor setting unit 53c sets the amplification factor as follows. The uplink amplification factor setting unit 53c stores a predetermined amplification factor (reference amplification factor) set in advance, and when the attenuation amount estimated by the attenuation amount estimation unit 53a is within a predetermined range, the uplink signal The amplifier circuit 52 is operated with a set reference amplification factor.
A chart (not shown) for increasing or decreasing the amplification factor from the reference amplification factor according to the attenuation amount when the estimated attenuation amount is out of the predetermined range is stored, and amplification is performed based on this chart. Change the rate. Specifically, when the estimated attenuation amount is larger than the predetermined range, the upstream signal amplification circuit 52 is operated with the amplification factor raised from the reference amplification factor according to the rate. On the other hand, when the predetermined range is not reached, the upstream signal amplification circuit 52 is operated with the amplification factor lower than the reference amplification factor according to the rate.

FIG. 3 is a diagram for explaining the operation of the relay amplifier 5 for setting the amplification factor in this way. FIG. 3A shows a case where the trunk line L3a from the control device 4 to the relay amplifier 5 is long and the signal attenuation is large. FIG. 3B shows a case where the trunk line L3a from the control device 4 to the relay amplifier 5 is short and the signal attenuation is small.
As shown in FIG. 3A, when the amount of attenuation of the downstream signal is large, the downstream amplification rate setting unit 53b enhances the downstream signal amplification circuit 51 so that the downstream signal amplification circuit 51 outputs a signal of a certain level. Increase the rate. Then, the uplink amplification factor setting unit 53c increases the amplification factor of the uplink signal amplification circuit 52 from the reference amplification factor, and the uplink signal amplification circuit 52 increases the output level of the uplink signal and outputs it.
On the other hand, as shown in FIG. 3B, when the downstream signal attenuation is small, the downstream amplification rate setting unit 53b reduces the enhancement factor of the downstream signal amplification circuit 51 and outputs the output level of the downstream signal amplification circuit 51. Is controlled to be constant. Then, the upstream amplification factor setting unit 53c lowers the amplification factor of the upstream signal amplification circuit 52 from the reference amplification factor, and the upstream signal amplification circuit 52 outputs the output level of the upstream signal lower than the reference amplification factor.

As described above, the relay amplifier 5 closest to the control device 4 estimates the attenuation amount of the downlink signal transmitted from the control device 4, and sets the amplification factor of the uplink signal amplification circuit 52 with reference to the attenuation amount. Therefore, even if the relay amplifier 5 is arranged near the control device 4, the control device 4 can receive the upstream signal transmitted from the room unit 2 at an appropriate level, and the control device 4 can receive a waveform shaping circuit or an attenuator.・ No need to install hardware such as AGC amplifier. In addition, in any relay amplifier 5, the upstream signal amplification circuit 52 does not amplify the signal more than necessary, so that the power consumption of the apartment house intercom system can be suppressed.
When the estimated attenuation amount of the upstream trunk line L3 of the relay amplifier 5 is larger than the predetermined range, the amplification factor is raised from the reference amplification factor, and when it is smaller, the amplification factor is lowered from the reference amplification factor. The receiving device can receive a signal at a preferable level regardless of the length (attenuation amount) of the trunk line L3 reaching the downstream relay amplifier 5, and wasteful power consumption does not occur.

Note that the call / response operation, which is the basic operation of this apartment house intercom system, and the operation in which the camera 12 is activated upon receiving the call operation and the video signal is transmitted to the room unit 2 are the same as those of the conventional apartment house intercom system. Therefore, the description is omitted.
In the above embodiment, the gain of the downlink signal amplifier circuit 51 is controlled by feedback control. However, feed forward control in which the gain is set based on the input signal level may be used. Since the amplification factor is set based on the information obtained by the attenuation amount estimation unit 53a, an independent gain control circuit is not necessary for the downlink amplification factor setting unit 53b. Therefore, the hardware of the relay amplifier 5 can be simplified and downsized, and can be configured at low cost.
Further, in the above embodiment, all the relay amplifiers 5 are the upstream output variable amplifiers having the circuit shown in FIG. 2, but only the relay amplifier 5 closest to the control device 4 is the upstream output variable amplifier, and the other relay amplifiers are Similarly to the downstream signal amplifier circuit 51, the upstream signal amplifier circuit 52 may be a relay amplifier that is operated by feedback control for controlling the gain so that the output level becomes constant based on its own output signal information. Even with this configuration, the control device 4 can receive the upstream signal transmitted from the room unit 2 at an appropriate level, and it is not necessary to provide the control device 4 with hardware such as a waveform shaping circuit, an attenuator, and an AGC amplifier. .

  1 .. Collective entrance machine 2.. Living room machine 4.. Control device 5.. Relay amplifier (upstream output variable amplifier) 51.. Downstream signal amplifier circuit 52.. Upstream signal amplifier circuit 53. Gain control unit, 53a... Attenuation estimation unit, 53b .. downlink gain setting unit, 53c .. uplink gain setting unit.

Claims (3)

A collective entrance machine for a visitor to select a dwelling unit and call a resident, a living room machine for a resident to respond to the call, and an intervening device between the collective entrance machine and the living room machine A control device that controls communication, and a collective housing intercom system that interposes a plurality of relay amplifiers that amplify a main line signal on a main line connecting the control device and the room unit,
The relay amplifier includes a downlink signal amplification circuit that amplifies a downlink signal transmitted from the control device toward the room unit, and an uplink signal amplification circuit that amplifies an uplink signal transmitted from the room device toward the control unit. Have
At least the relay amplifier closest to the installation of the controller, the signal level of the downlink signal received, estimates the attenuation of the trunk between the most recent equipment and itself has sent the downlink signal to the own and attenuation evaluating unit which, Ri uplink output variable amplifier der having an uplink amplification factor setting unit for setting a gain of the uplink signal amplifier circuit based on the attenuation amount information which the attenuation evaluating unit is estimated,
The attenuation amount estimation unit stores the output level of the latest device that has transmitted the received downlink signal, and compares the stored value with the signal level of the received downlink signal to estimate the attenuation amount. Apartment house intercom system. The uplink output variable amplifier sets the amplification factor of the downlink signal amplifier circuit so that the output of the downlink signal amplifier circuit becomes a predetermined constant level based on the signal level information of the downlink signal detected by the attenuation amount estimation unit 2. The collective housing intercom system according to claim 1, further comprising a downlink amplification factor setting unit. The upstream amplification factor setting unit operates the upstream signal amplification circuit with a preset constant amplification factor when the estimated attenuation amount is within a predetermined range,
When the estimated amount of attenuation exceeds the predetermined range, the upstream signal amplifier circuit is operated at an amplification factor higher than the constant amplification factor, and when the estimated attenuation amount is not less than the predetermined range, the constant amplification factor. 3. The collective housing intercom system according to claim 1, wherein the upstream signal amplifier circuit is operated at a lower amplification factor.

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