JPH0787490B2 - Control method of a collective entrance system with TV - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a control method for a collective entrance system with a television, and more particularly to a method for controlling a collective entrance system with a television using a two-wire balanced cable.

[Prior Art and Problems to be Solved by the Invention] A conventional method for controlling a collective entrance system with a television is, as shown in FIG. 2, an audio signal f between the room units 31, 32 ... And the collective entrance machine 30. ₁ , the audio signal cable La for transmitting the video signal f ₂ and the control signal f ₃ , the video signal cable COX, and the control signal cable Lb are connected by a bus system.

Handsets 31a, 32a of the office units 31, 32 ..., Television monitor 31
The audio signals f ₁ and video signals f ₂ between the speakers 32a, the microphones 33b, and the television camera 34a of b, 32b, ... And the collective entrance 30 are controlled by a control circuit 35 provided in the collective entrance 30. The circuit 34 and the call circuit 33 are used.

The control system of the collective entrance system with a TV with this configuration is a bus connection, so the control system is complicated, and a video signal cable COX, which is difficult to wire, must be installed between the collective entrance machine 30 and the room machines 31, 32, ... There are drawbacks such as.

[Object of the Invention] The present invention has been made in view of the above-described drawbacks, and a tuning relay provided in a collective entrance by connecting a living room machine and a collective entrance with a two-wire balanced cable in a one-to-one system. It is an object of the present invention to provide a control method of a collective entrance system with a television, which is easy to control, by preventing the number of stored items from being more than one.

[Means for Solving the Problems] In order to achieve the above object, a control method of a collective entrance system with a television according to the present invention is provided with a plurality of room units having a handset, a television monitor, and a multiplexing circuit, a speaker, and a microphone. A method of controlling a collective entrance system with a television, wherein a two-wire balanced cable is connected between a TV camera and a collective entrance having a multiplexing circuit in a one-to-one correspondence, and a voice signal and a video signal are transmitted and received. When one of a plurality of call buttons provided on the collective entrance machine is pressed, a tuning relay corresponding to each of a plurality of room machines provided on the collective entrance machine is operated, and a two-wire balanced cable is connected by its switching contact. To the multiplexing circuit, and the photocoupler is operated from the power supply to the photocoupler, diode, calling button, and circuit of the reference potential point, and the calling signal is multiplexed from the control circuit to the multiplexing circuit, switching contact, While transmitting to the room via a two-wire balanced cable, the channel selection relay holds only the channel selection relay when one of the call buttons is pressed, and the retained channel selection relay outputs an audio signal. The video signal is transmitted and received between the collective entrance and the room, and other held channel selection relays are released.

[Embodiment] An embodiment of a control method for a collective entrance system with a television according to the present invention will be described in detail below with reference to FIG.

In FIG. 1, two-line balanced cables L ₁ and L ₂ , L ₃ and L _4, ... Are provided between the room units 11, 12 ... And the collective entrance 20.

A two-wire balanced cable L ₁ is attached to the living room unit 11 (hereinafter, the living room unit 12 ... is a scary circuit configuration of the living room unit 11 and its description is omitted).
A multiplexing circuit 11d for multiplexing the audio signal f ₁ and the video signal f ₂ transmitted / received via L ₂ is provided. The multiplexing circuit 11d is a speech circuit for the multiplexed or separated upstream and downstream audio signals f _1.
The video signal f ₂ which is transmitted / received to / from the handset 11a via 11c is sent to the television monitor 11b via the video circuit 11e.

The collective entrance machine 20 is provided with tuning units U ₁ , U _2, ... Comprising a switching unit SU ₁ and a relay holding unit SU ₂ . The tuning units U ₁ , U ₂ ... are circuits installed corresponding to the room units 11, 12 ..., and only the tuning unit U ₁ will be described below, and the other tuning units U ₂ ... will be described. Is omitted.

Multiplex circuit 24, call circuit as a common circuit of the collective entrance 20
21, video circuit 22, control circuit 23 and photo coupler circuit
25 are provided. The common circuit is connected to the disconnecting portion SU ₁ of the tuning units U ₁ , U ₂ ... And the terminals T _{3 to} T ₆ of the relay holding portion SU ₂ by internal wiring W _{1 to} W ₄ .

The multiplexing circuit 24 separates the multiplexed upstream voice signal f ₁ and receives it by the speaker 21a via the communication circuit 21, and multiplexes the downstream voice signal f ₁ generated by the microphone 21b via the communication circuit 21. . The video signal f ₂ from the TV camera 22a is fed to the video circuit 2
Multiplex via 2.

The call signal sent from the photocoupler circuit 25 is input to the control circuit 23. Terminal T of switching unit SU ₁ of tuning unit U ₁
Two-wire balanced cables L ₁ and L ₂ are connected to ₁ and T ₂ , and terminal T
₁ and T ₂ are the movable contacts of the switching contacts ry ₁ a and ry ₁ b of the tuning relay RY ₁ , the matching circuit Z ₁ on the break side, and the terminals T ₃ , T ₄ on the make side.
Further, the terminals T ₃ and T ₄ are connected to the multiplexing circuit 24 via the internal wirings W ₁ and W ₂ .

The relay holding unit SU ₂ is provided with a call button SW ₁ whose one end is connected to the reference potential point. The other end of call button SW ₁ is connected to the base of transistor Q ₂ via the cathode and anode of diode D ₁ and resistor R ₁ .

End power + Vcc to a capacitor connected C ₁ and the resistance R ₂ of the other end and one end connected to the reference potential point by channel selection relay RY
The other end of ₁ is connected to the base and collector of the transistor Q ₂ , and the emitter is connected to the power supply + Vcc. The collector is connected to the reference potential point via the resistor R ₄ , the cathode and anode of the Zener diode D ₅ , and the resistor R ₅ . The other end of the resistor R ₃ whose one end is connected to the base of the transistor Q ₂ and the other end of the capacitor C ₂ whose one end is connected to the reference potential point are the collector and base of the transistor Q ₁ whose emitter is connected to the reference potential point. Respectively connected to. The base is connected to the connection point between the resistor R ₅ and the anode of the Zener diode D ₅ . The anode of the diode D ₄ whose cathode is connected to the terminal T ₅ is connected to the connection point between the resistor R ₄ and the cathode of the Zener diode D ₅ .
The cathodes of the diodes D ₂ and D ₃ whose anodes are connected to the terminals T ₅ and T ₆ are connected to the other end of the call button SW ₁ .

The terminal T ₆ is connected to the cathode of the photocoupler 25a of the photocoupler circuit 25, and the anode is connected to the resistor R ₀ whose one end is connected to the power supply + Vcc.

[Operation of the Invention] In the control method of the collective entrance system with a TV configured as described above, the call button SW provided in the relay holding unit SU ₂ of the channel selection unit U ₁ in the collective entrance machine 20 in order to call the room unit 11. _{When 1} is pressed, the bias current of the transistor Q ₂ becomes the power supply + Vcc, the emitter and base of the transistor Q ₂ ,
It flows through the resistor R ₁ , the diode D ₁ , the closed tuning button SW ₁ , and the circuit of the reference potential point. Transistor with this bias current
Q ₂ works. When the transistor Q ₂ operates, the channel selection relay RY ₁ operates, and the switching contacts ry ₁ a and ry ₁ b switch the 2-wire balanced cables L ₁ and L ₂ to the multiplexing circuit 24, and the matching circuit Z ₁ is turned off. Let go. At the same time, the power of the photocoupler circuit 25 + Vcc, resistance R
_The photocoupler 25a operates by the circuit of ₀ , the photocoupler 25a, the terminal T ₆ , the diode D ₃ , the closed call button SW ₁ , and the reference potential point. As a result, the calling signal is sent to the room unit 11 via the control circuit 23, the multiplexing circuit 24, the switching unit SU ₁ , and the cables L ₁ and L ₂ , and the calling signal is sent to the calling circuit 11c via the multiplexing circuit 11d. Send out. The call circuit 11 sends a ringing tone from a built-in speaker.

After that, even if the pressing of the call button SW ₁ is stopped, the transistors Q ₁ and Q
_{Since the} channel selection relay RY ₁ is held by the holding circuit configured by ₂ , the communication circuits of the room unit 11 and the collective entrance unit 20 remain held. When the call ends, the on-hook device 11 goes on-hook.

Next, when the calling button is pressed in the tuning unit U ₂ to call the office unit 12, the tuning relay is held and the calling signal is sent to the office unit 12 as described above. On the other hand, relay holding part
Transistor Q ₂ from the power supply + Vcc to hold the channel selection relay RY ₁ of SU _2, the resistance R _4, the zener diode D _5, the base of the transistor Q _1, the emitter and the current flowing based on resistance potential point, the diode D ₄ , Terminal T ₅ , and internal wiring W ₃ to the call button of the relay holding unit SU _{4 that} is being called, the switching unit S
U ₂ 's tuning relay SY ₁ is released, the communication circuit between room unit 11 and collective entrance 20 is cut off, and room 12 and collective entrance 20 are shut off.
Only 20 call circuits are retained.

[Effects of the Invention] As is clear from the above embodiments, according to the control method for a collective entrance system with a television according to the present invention, a wiring process is simple, control is easy, and clear video signals can be transmitted and received. it can.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing an embodiment of a collective entrance system with a television used in the control method of the present invention, and FIG. 2 is a block diagram of a collective entrance system with a television used in a conventional control system. 11a …… Handset 11b …… TV monitor 11d …… Multiplexing circuit 11, 12 …… Living room 20 …… Collective entrance, 21a …… Speaker 21b …… Microphone 22a …… TV camera 23 …… Control circuit 24… … Multiplexing circuit 25a …… Photocoupler L ₁ , L ₂ …… 2-wire balanced cable RY ₁ …… Selection relay SW ₁ …… Call button Q ₁ , Q ₂ …… Transistor (holding circuit) f ₁ …… Voice Signal f ₂ …… Video signal ry ₁ a, ry ₁ b …… Switching contact + Vcc …… Power supply D ₃ …… Calling diode D ₄ …… Release diode Tr ₁ , Tr ₂ …… Holding circuit

Claims (1)

[Claims] 1. A plurality of room units (11, 12) having a handset (11a), a television monitor (11b) and a multiplexing circuit (11d).
…) And a speaker (21a), a microphone (21b), a television camera (22a), and a collective entrance (20) having a multiplexing circuit (24) in a one-to-one correspondence with a two-wire balanced cable (L). ₁ ,
A method of controlling a collective entrance system with a television, which is connected by L ₂ ...) and transmits and receives an audio signal (f ₁ ) and a video signal (f ₂ ), wherein a plurality of call buttons (SW) provided on the collective entrance machine are provided. ₁ )
When one of the above is selected, the channel selection relay (RY ₁ ) provided in the collective entrance machine and corresponding to each of the plurality of room machines
2) by operating the switching contact (ry ₁ a, ry ₁ b).
Switch the wire balanced cable to the multiplexing circuit,
Photo from Vcc) coupler (25a), a diode (D _3), the call button, the circuit reference potential point by operating a photocoupler (25a) control circuit (23) the multiplexing circuit of the ringing signal from the switching While transmitting to the room unit via the contact point and the two-wire balanced cable, the tuning relay holds and holds only the tuning relay when one of the plurality of call buttons is pressed. A control method for a collective entrance system with a television, wherein an audio signal and a video signal are transmitted / received between a collective entrance machine and a living room machine by a tuning relay, and other held tuning relays are released.