JPH0683452B2 - Multiplexing method for TV intercoms for apartments - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention relates to a common entrance cordless handset having a camera, a transmitter, and a receiver at a common entrance, a monitor TV and a transmitter, and an indoor master unit having a receiver at each dwelling unit. The multiplex system of the installed TV intercoms for housing.

<Prior Art> Conventionally, as this type of TV door intercom system for an apartment house, for example, one shown in FIG. 3 is known.
This TV intercom system has a camera, a transmitter, and a receiver, which is installed at the common entrance on the first floor of an apartment complex, and a sub-door unit 21, for example, eight intercom lines installed on each floor.
22 and one coaxial cable line 23 through the above common entrance cordless handset
16 repeaters 24 connected to 21 and six intercom lines 25 installed in each dwelling unit and one coaxial cable line 26 are connected to the repeater 24 on each floor to send to a monitor TV. It is composed of 256 (16 × 16) indoor master devices 27 each having a receiver.
Then, the video signal from the common entrance cordless handset 21 is transmitted through the coaxial cable line 23, and the call signal from the common entrance cordless handset 21 and the voice signal between the child and the master unit are transmitted through the intercom lines 22 and 25, respectively. A book and two books are transmitted so that a visitor can call the other party's dwelling unit from the entrance cordless handset 21, and the called party can talk while looking at the visitor's face.

<Problems to be Solved by the Invention> However, in the above-mentioned conventional TV door phone system,
At least six intercom lines 25 and one coaxial cable line 26 are wired from the common entrance 21 on each floor to each dwelling unit on each floor, which makes the wiring complicated and troublesome, and wiring work for new construction Not only does it take a long time, but also a large amount of wiring material is required, resulting in a large installation cost. Also, since the six intercom lines 25 and the one coaxial cable line 26 must be wired without fail, even if there is an existing intercom system wired with two intercom lines, this can be used as a TV intercom system. It is difficult to divert, and wiring this TV intercom system to an existing building is much more complicated than when building a new building, and it is virtually impossible from the viewpoint of installation cost.

Therefore, an object of the present invention is to provide an image on a pair of intercom lines,
By overlapping and transmitting voice and call signals as well as DC power, the wiring material can be reduced, wiring work time can be shortened, installation cost can be greatly reduced, and it can be easily installed in existing buildings. It is to provide a multiplexing method of a TV intercom for an apartment house that can be wired.

<Means for Solving the Problems> In order to achieve the above-mentioned object, the multiplexing system of the TV door phone for housing complex of the present invention is equipped with a camera, a transmitter, and a receiver, and is installed at a common entrance to provide video, voice, and call. I was called by a common entrance cordless handset that modulates and multiplexes the signal and outputs it to a pair of main intercom lines, and a decoder that decodes the call signal from the multiplexed signal input through the main intercom line. A plurality of repeaters having a line switching circuit for switching and connecting the main intercom line to the pair of branch intercom lines by the decoder that has decoded the above, and a plurality of repeaters connected to the branch intercom lines of each repeater, The decoder that decodes the calling signal from the multiplexed signal that is input through the branch intercom line and the decoder that decodes that A parent adapter having a line switching circuit for switching and connecting the branch intercom line to the pair of dwelling unit intercom lines, and a display device,
Installed in each dwelling unit with a handset, equipped with a plurality of indoor master units that demodulate the multiplexed signal input through the dwelling unit intercom line and separate video and audio signals, and each relay To the main intercom line from the common entrance cordless handset, and to each of the parent adapters from the indoor master unit via the dwelling unit intercom line. The feature is that video, audio, call signal and DC power supply are superimposed and multiplexed for transmission.

<Operation> A guest who enters the joint entrance first enters the number of the dwelling unit to be visited at the joint entrance slave. Then, the joint entrance cordless handset modulates and multiplexes the call signal corresponding to the input dwelling unit number and the video signal of the visitor captured by the camera to 1
Output to the main intercom line of the pair. The multiplexed signal is
For example, the signal is transmitted to the repeaters installed on each floor of the apartment house through the main intercom line, and the decoder of the repeater on the floor to which the calling dwell unit belongs decodes the fact that it is called and performs a line switching circuit. The main intercom line is switched and connected to the pair of branch intercom lines. Then, the multiplexed signal is transmitted to the parent adapter of each dwelling unit on the floor via the branch intercom line, and the decoder of the parent adapter of the calling dwelling unit decodes that it is called and the line switching circuit. Then, the branch intercom line is switched and connected to the pair of dwelling unit intercom lines. Thus
When the indoor master unit of the calling dwelling unit and the common entrance slave unit are connected and the resident of the dwelling unit picks up the receiver, the video signal demodulated and separated by the indoor master unit, that is, the appearance of the visitor is displayed on the display device, and the audio signal The voice of the visitor is output to the handset, and the voice of the resident is transmitted from the handset to the handset of the common entrance subunit via a pair of intercom lines.

In addition, for example, the above-mentioned repeater installed one on each floor,
Multiplexed DC power is supplied from the common entrance slave unit via the main intercom line, and the parent adapters installed in each dwelling unit are multiplexed from each indoor master unit via the dwell unit intercom line. DC power is supplied.

Thus, according to the multiplexing method of the present invention, a call can be realized while looking at the face of the guest at the common entrance with a small amount of wiring material and a pair of intercom lines that does not require wiring.

<Examples> Hereinafter, the present invention will be described in detail with reference to illustrated examples.

FIG. 1 is a schematic diagram showing an embodiment of a TV door phone system for an apartment house, in which 1 is arranged at a common entrance with a camera, a transmitter and a receiver, and modulates and multiplexes video, audio and call signals. The common entrance cordless handset that outputs to the pair of main intercom lines 5, 2i is installed on the i-th floor (1 ≦ i ≦ 16) of the housing complex, and the multiplexed signal input through the main intercom line 5 is used as above. A decoder 3 for decoding the calling signal,
It is a repeater having a line changeover switch 4 which is switched by the decoder 3 which has decoded the fact that it has been called so as to connect the main intercom line 5 to the pair of branch intercom lines 6.

7ij is a decoder 8 which is installed in the j-th (1 ≦ j ≦ 16) dwelling unit on the i-th floor and decodes the calling signal from the multiplexed signal input from the repeater 2i via the branch intercom line 6. , A parent adapter having a line selector switch 9 which is switched by the decoder 8 which has decoded the fact that it has been called so as to connect the branch intercom line 6 to the pair of dwelling unit intercom lines 10, 11ij is the j-th one on the i-th floor Is an indoor master unit installed in a dwelling unit, having a monitor television, a transmitter and a receiver, and demodulating a multiplexed signal input through the dwell unit intercom line 10 to separate a video signal and an audio signal.

The main interphone line 5 serves to connect common entrance parent device 1 and the first floor of the repeater 2 _1, n Floor (1 ≦ n ≦ 15) of the repeater
The b contact 4b of the 2n line change switch and the decoder 3 of the repeater 2 (n + 1) on the (n + 1) th floor are connected one after another,
When not talking, the repeater 2i on each floor is all connected to the common entrance subunit 1 through its normally closed contact point 4b. On the other hand, the branch intercom line 6 connects the a-contact 4a of the repeater 2i on the i-th floor to the decoder 8 of the parent adapter 7i ₁ of the _first dwelling unit on the floor, and the m-th (1 ≦ m ≦ 16) Dwelling unit parent adapter 7i
The contact point 9b of the m line changeover switch 9 and the decoder 8 of the parent adapter 7i (m + 1) of the (m + 1) th dwelling unit are connected one after another, and the parent adapter 7ij of each dwelling unit is in the normally closed b state when not in a call. All contacts a of relay 2i on the floor via contact 9b
It continues to the 4a side.

The signal multiplexing method of the above-mentioned common entrance cordless handset 1 FM-modulates the low-frequency carrier with the video signal captured by the camera, and FM-modulates the carrier of several hundred KHz with the voice signal and the calling signal code from the transmitter / receiver. Then, the frequency division multiplex communication is used in which the signals are simultaneously transmitted to the pair of main intercom lines 5, and the voice signal is a bidirectional simultaneous call. Meanwhile, the repeater 2i and the parent adapter 7i
The decoders 3 and 8 in j are an FM demodulator that separates the calling signal from the multiplexed signal by a squelch circuit, and the demodulated calling dwelling unit code is the floor (i floor) or the dwelling unit number (j). It is composed of a microcomputer that determines whether or not the above is satisfied. An LC series resonance circuit is provided on the signal input side of each decoder 3 and 8 to synchronize with the voice carrier. In addition, a repeater that serves as a terminal for the main intercom line 5
2 ₁₆ between the b contacts of the line changeover switch 4 and between the b contacts of the line changeover switch 9 of the parent adapter 7i _{16 which} is the terminal of the branch intercom line 6 have resistors R ₁ to R ₁ for ensuring matching during transmission. Each R ₁₇ is provided. Furthermore, the DC power that has been multiplexed is supplied to each repeater 2i from the common entrance slave unit 1 via the main intercom line 5 and the pair of lines 12, and each parent adapter 7ij is supplied to each dwell unit. Multiplexed DC power is supplied from the indoor master unit 11ij via the dwelling unit intercom line 10.

The operation of the TV intercom system for an apartment with the above configuration will be described below.

A visitor who enters the common entrance of an apartment house first enters the number of the dwelling unit to be visited in the common entrance slave unit 1. Then, the common entrance subunit 1 generates a digital signal as shown in FIG. 2 (a) corresponding to the dwelling unit number, and the voice carrier is FM-generated by this digital signal as shown in FIG. 2 (b).
The signal is modulated, superposed on a low frequency carrier which is FM-modulated by the video signal of the visitor, multiplexed and transmitted to the main intercom line 5. The digital signal corresponding to the dwelling unit number is a front group bit sandwiched by a start bit and an end bit of 4 bits indicating the floor,
It is composed of a rear group bit in which 4 bits representing the dwelling unit number are similarly sandwiched, and are "1100" and "0101" in the example of FIG. 2 (a), which represents the 6th dwelling unit on the 13th floor. The signal thus sent to the main intercom line 5 is input to the repeater 2i on each floor via the normally closed b contact 4b of the line changeover switch 4, and the FM demodulator in each decoder 3 has only the above-mentioned front group bits. Output a demodulated digital signal to the microcomputer as shown in FIG. 2 (c), which becomes "1" level only when the designated frequency is input, and the microcomputer applies the demodulated digital signal to its rank. Whether or not to do so, when it is determined to be applicable, the line changeover switch 4 is switched and connected to the a contact 4a side. Figure 2 (c) Example The switches only the line changeover switch 4 of the 13 floor of the repeater 2 ₁₃ to a connection 4a side, so that the 13-floor branch interphone line 6 is selected. Next, this branch intercom line 6
The multiplexed signal transmitted is transmitted through the normally closed contact point 9b of the line changeover switch 9 to the parent adapter of all dwelling units on the 13th floor.
7 ₁₃ j, the FM demodulator and the microcomputer in each decoder 8 operate in the same manner as in the case of the repeater described above, and the rear group bits are decoded as shown in FIG. 2 (d). Then, only the line changeover switch of the 6th dwelling unit switches to the a contact 9a side, and the indoor master unit of the 6th dwelling unit on the 13th floor
11 ₁₃₆ and common entrance cordless handset 1 are connected for the first time on a one-to-one basis.
In this way, when the resident of the dwelling unit picks up the receiver of the indoor master unit 11 ₁₃₆ , the video signal demodulated and separated by the indoor master unit, that is, the figure of the visitor is displayed on the monitor TV, and the resident person of the visitor interacts with each other. It enables simultaneous voice calls.

As described above, according to the present invention including the above-described embodiment, there is a pair of intercom lines 5, 6, 10 between the common entrance cordless handset 1 and the indoor main unit 11ij of each dwelling unit, and there is no waste due to duplication. Since it is connected sequentially so that there is no image transmission and simultaneous voice communication, wiring material and wiring work are possible compared to the transmission method using several intercom lines and one coaxial cable shown in Fig. 3. There is an advantage that the time and labor required are significantly reduced, the installation cost can be significantly reduced, and an existing pair of intercom lines can be diverted to an existing building and easily wired. Further, since the repeater 2i is supplied with the multiplexed DC power from the common entrance slave 1 side, and the parent adapters 7ij are supplied with the multiplexed DC power from the indoor master 11ij side of each dwelling unit, respectively. This has the advantage that the wiring can be significantly reduced and the installation cost can be reduced.

Note that the call signal code demodulation by the decoder of the repeater and the parent adapter may be performed by, for example, the FSK (frequency shift) method instead of the squelch output of the embodiment. Also,
The number of dwelling units with a parent adapter is 256 (16 x 16) in the example
It goes without saying that the wiring between the common entrance slave unit, the repeater, and the parent adapter is not limited to that of the embodiment.

<Effects of the Invention> As is apparent from the above description, the multiplexing system of the TV door phone for housing complex according to the present invention has a camera, a transmitter, and a receiver, and multiplexes video, audio, and call signals to form a pair. A common door station that outputs to the main intercom line and the call signal is decoded from the multiplexed signal, and when the user is called, a line switching circuit is used to move the main intercom line to the side of a pair of branch intercom lines. A repeater having a decoder for switching and a plurality of branch intercom lines are connected to each other, and a line switching circuit is used to switch the branch intercom lines to a pair of dwelling unit intercom lines when called. A parent adapter with a decoder and a display device,
An indoor master unit that has a handset and that demodulates the multiplexed signal input from the dwelling unit intercom line to separate a video signal into an audio signal is provided. Through the intercom line, each of the parent adapters is supplied with the multiplexed DC power from the indoor base unit through the dwelling unit intercom line, and the video, audio, and call signals are supplied to the pair of intercom lines. Since DC power is superimposed and multiplexed for transmission, compared to the conventional method in which several intercom wires and coaxial cables are wired to each dwelling unit, wiring materials including power lines and wiring work The time and labor can be drastically reduced, the installation cost can be significantly reduced, and wiring to an existing building can be performed easily.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing an embodiment of a TV door phone system for an apartment house of the present invention, FIG. 2 is a signal waveform diagram for explaining the operation of each part of the above embodiment, and FIG. 3 is a conventional television for an apartment house. It is a schematic diagram of a doorphone system. 1 …… Common entrance cordless handset, 2i …… Repeater (i floor), 3,8 ……
Decoder, 4,9 ... Line changeover switch, 4a, 9a ... a contact, 4b, 9b
...... B contact, 5 ...... Main intercom line, 6 ...... Branch intercom line, 7ij
…… Parent adapter (jth dwelling unit on the i-th floor), 10 …… Dwelling unit intercom line, 11ij …… Indoor master unit.

Continuation of the front page (56) Reference JP-A-58-141086 (JP, A) JP-A-62-29384 (JP, A) Practical application Sho-62-5753 (JP, U)

Claims (1)

[Claims] 1. A public entrance cordless handset, which has a camera, a transmitter and a receiver, is installed in a common entrance, and modulates and multiplexes video, audio and call signals and outputs them to a pair of main intercom lines, and the main intercom. A line switch for switching and connecting the main intercom line to a pair of branch intercom lines by a decoder that decodes the calling signal from a multiplexed signal that is input via a line and the decoder that decodes that the user has called A plurality of repeaters each having a circuit, and a decoder which is connected to the branch intercom line of each repeater and decodes the call signal from the multiplexed signal input through the branch intercom line A master switch having a line switching circuit for switching and connecting the branch intercom line to the pair of dwelling unit intercom lines by the decoder that has decoded Installed in each dwelling unit, which has a display unit, a display unit, a transmitter, and a receiver, and which demodulates a multiplexed signal input through the dwell unit intercom line to separate a video signal and an audio signal from each other. In addition, each of the repeaters is supplied with the multiplexed DC power from the common entrance slave unit via the main intercom line, and to each parent adapter from the indoor master unit via the dwelling unit intercom line. Then, a video / audio / call signal and a DC power source are superposed on each of the intercom lines, and multiplexed for transmission.