JPS6276851A - Channel selection device for multi-station interphone - Google Patents

Abstract

PURPOSE:To simplify the constitution by connecting plural interphone stations to one transmission line and using a control signal from a call station of the interphone stations so as to apply talking by a voice signal through a talking line formed between a caller station and a called station. CONSTITUTION:In an interphone station, when a call operation device 3 is operated, a destination signal forming circuit 6 is operated to form a destination signal. When the device 3 is operated, the destination signal forming circuit 5 is operated to form a destination signal based on the own station code stored in an own station signal storage circuit 4. The destination signal and a sender signal are modulated by a modulation circuit 7 and sent to all interphone stations from a transmission line L. After the end of transmission of the destination signal and the sender signal to the line L, a connection command signal to the line L is given from a talking circuit control device 15 to the talking circuit 2 and the talking circuit 2 of the interphone station being a caller station is connected to the line L. Thus, the circuit constitution is simplified, the wiring work is simplified and a channel selection signal modulator/demodulator is not required for a carrier interphone and the manufacture cost is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a channel selection device for a multi-station intercom that selects a channel among a plurality of intercom stations.

[Background of the invention]

For example, a large number of elevators within a building may be equipped with emergency communication intercoms to enable communication between the elevators. This kind of multi-station intercom channel selection device 1t
Regarding K, related technology is disclosed in, for example, Japanese Patent Laid-Open No. 58-66458.

In this previously proposed multi-station intercom channel selection device, a control transmission line for channel selection is required in addition to a transmission line for one call, and wiring is required for each of these transmission lines. The disadvantage is that it is complicated.

[Purpose of the invention]

This invention solves the problem of complicated wiring in multi-station intercom channel selection devices that have been proposed in the past.

To provide a channel selection device for a multi-channel intercom whose configuration is simplified by performing channel selection and communication using a common transmission line.

[Summary of the invention]

In this invention, when multiple intercom stations are connected to a single transmission line, a control signal from the call station of the intercom station forms a communication line between the calling station and the called station, and this communication line The system is configured so that calls can be made using voice signals.

In this invention, the intercom station is not provided with a communication circuit and a connection circuit. At the intercom station that is the calling station, after sending the destination signal for selecting the intercom station that will be the called station and the source signal of the calling station from its connection circuit to the transmission line, connect the communication circuit to the transmission line. do.

On the other hand, when the intercom station serving as the called station detects through its connecting circuit that the destination signal sent from the calling station is its own station code, it connects one speech circuit to the transmission line. Through this connection, a communication line is established between the calling station and the called station, and communication using voice signals becomes possible.

After the calling station sends the destination signal and source signal to the transmission line, its communication circuit is connected to the transmission line, and the called station detects that the destination signal is its own station code.

Since the communication circuit is connected to the transmission line, it is configured with a single transmission line, and complexity of wiring can be avoided.

[Embodiments of the invention]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the multi-station intercom channel selection device of the present invention will be described in detail based on embodiments thereof using the drawings.

FIG. 1 shows the configuration of an embodiment of the present invention, in which a plurality of intercom stations 1 and 2 are provided for one transmission line.

(1), .

FIG. 2 shows the configuration of the connection circuit 1 provided at each intercom station, and the output terminal of the call operator 3 is connected to the source signal generation circuit 5. Destination signal generation circuit 6 and communication circuit controller 1
The output terminal of the first communication circuit controller 15 is connected to the communication circuit 2. The output terminals of the source signal generation circuit 5 and the destination signal generation circuit 6 are connected to the input terminal of the modulation circuit 7, and the output terminal of the modulation circuit 7 is connected to the transmission line LK.

On the other hand, a local signal storage circuit 4 is provided, and the output terminal of the local signal storage circuit 4 is connected to the input terminals of the source signal generation circuit 5 and the called operation determination circuit 13, respectively. Further, the output terminal of the called operation determining circuit 13 is connected to the input terminal of the 1-speech circuit controller 15.

The input terminal of the demodulation circuit 8 is connected to the transmission line.

The output terminal of the demodulation circuit 8 is connected to the source signal detection circuit 9 and the destination signal detection circuit 100 input terminals. The output terminal of the source signal detection circuit 9 is connected to the input terminal of the source signal storage circuit 11, and the output terminal of the source signal storage circuit 11 is connected to the input terminal of the source display 14. Destination signal detection circuit 1
The output terminal of the destination signal storage circuit 12 is connected to the input terminal of the destination signal storage circuit 12, and the output terminal of the destination signal storage circuit 12 is connected to the input terminal of the called operation determining circuit 13. The output terminal of the called operation determining circuit 13 is connected to the input terminals of the sender display 14 and the communication circuit controller 15.

Figure 3 shows each intercom L, It...In
1 Display button 2], 22...
. . 35 are provided, and these display buttons are pressed to select intercom station 1, intercom station 2, . . . intercom station 15. Also,
At the called station, the light is turned on by pressing the button at the calling station.

The display buttons 36, 37, . . . , 43 are grouped intercom stations, respectively. Group 1j Group 2...Do not press when selecting Group 7 as the called station. Furthermore, these display buttons are configured to light up at the called station when pressed at the calling station.

Further, a response button 44 is not provided, and by pressing the response button 44, the called station can call the calling station. The interrupt prohibition button 45 is pressed when making a call in the interrupt prohibited state. Furthermore, a setting button 46 is provided, and by operating this setting button 46, the station code and group code are set.

When the call operator 3 is operated at the intercom station serving as the calling station, the destination signal generation circuit 6 is activated and a destination signal is generated. When the call operator 3 is operated, the source signal generation circuit 5 is also activated, and a source signal is generated based on the local station code stored in the local station signal storage circuit 4.

The destination signal and the source signal are modulated by the modulation circuit 7 and transmitted to all intercom stations from the transmission line. Transmission line for destination signal and source signal 1. After the transmission to the intercom station is completed, a connection command signal to the transmission line is given from the 1-speech circuit controller 15 to the speech circuit 2, and the speech circuit 2 of the intercom station serving as the calling station is connected to the transmission line LK.

The demodulation circuit 8 of each intercom station connected to the transmission line 1 demodulates the modulated signal on the transmission line, and the destination signal is detected by the destination signal detection circuit LD,
It is stored in the destination signal storage circuit 12. The called operation determining circuit 13 determines whether the destination signal stored in the destination signal storage circuit 12 matches the local station code and group code stored in the local station signal storage circuit 4.

As a result, when it is determined that the destination signal does not match the local station code and the group code in which the local station is included, and that the local station is not being called by the calling station, the operation of the connection circuit stops there.

When the called operation determining circuit 13 determines that the calling station is not calling the local station, the operation of the connecting circuit is continued;
The source signal is detected by the source signal detection circuit 9, and the detected source signal is stored in the source signal storage circuit 11. In response to a display command signal from the called operation determining circuit 13, the sending signal stored in the sending signal storage circuit 11 is displayed on the sending source display 14.
will be displayed.

A connection command signal is input from the called operation determining circuit 13 to the communication circuit controller 15.
Connect to the transmission line ■. By connecting the communication circuit 2 to the transmission line, a communication line is formed between the calling station and the called station, and communication using voice signals is possible through this communication line.

Figures 4(A) to 4(C) show modulated signals on the transmission ML, and (A) shows a call operation in which a code for a single station or multiple stations that are not grouped is used as a destination signal. This is the case when

When the calling station performs a calling operation by operating the display buttons 36, 37, . A telephone communication circuit 2 is connected to the transmission line, allowing communication with a calling station.

When the calling station operates the response button 44 to make a call.

The connection circuit 1 designates the source signal stored in the source signal storage circuit 1 as the destination signal. Therefore, by operating the response button 44, the intercom station that was previously called is selected as the called station.

Figure wJ4 (Bl indicates the modulated signal on the transmission line in this case.

Generally speaking, if another station makes a call during one call.

The current call circuit is switched and one call is forcibly interrupted. In order to prevent this forced interruption of the call, the present invention is configured such that the destination signal can include an interrupt prohibition signal that disables the call operation of other stations.

In this case, if the display buttons 21, 22, .
0, the destination signal includes an interrupt disable signal.

A modulated signal is sent out on the transmission line. In this condition.

Intercom stations other than the called station that received the interrupt prohibition signal are prohibited from calling until they receive the termination signal, thereby avoiding forced interruption of the call.

This termination signal is configured to be generated when the operation of the interrupt prohibition button 45 at the calling station is stopped.

An example of the signal transmission format of the connection information created or detected by the connection circuit 1 that performs the operation described above is shown in FIGS. 5A and 5B. Figure 5 (
In the case of Al, 1 bit is used for the start signal, 1 bit is used for the control code, 3 bits is used for the group code, and 4 bits are used for the station code.
One bit is allocated to the end signal. Also,
The control code is used as an interrupt disable signal, and the group code and station code are used to call a grouped called station and a single called station, respectively, as shown in 5th []ff3).

〔Effect of the invention〕

According to this invention, a multi-station intercom channel selection device can be configured with a single transmission line, the single circuit configuration is simplified, wiring construction work is simplified, and the channel selection device for a carrier type intercom can be configured. This eliminates the need for a modulator/demodulator, reducing manufacturing costs.

[BRIEF DESCRIPTION OF THE DRAWINGS] FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention.
FIG. 2 is a block diagram showing the configuration of a connection circuit in an embodiment of the invention, and FIG. 3 is a front view of an intercom station in an embodiment of the invention. 4(A) and (F31.fC) are diagrams showing the structure of the modulated signal on the transmission line in the embodiment of the present invention, and FIG. 5(A). ω) It is a diagram showing the structure of the transmission format of connection information in the embodiment of the invention of C and C. l... Connection circuit, 2... Call circuit, 3
...Call operator, 4... Own station signal memory circuit, 5... Source signal memory circuit, 6...
Destination signal creation circuit, 7...Modulation circuit, 8...
... Demodulation circuit, 9 ... Source signal detection circuit. 10... Destination signal detection Iρ1 path, 11...
... Source signal storage circuit, 12 ... Destination signal %
rJ storage circuit, 13... Called operation determination circuit, 14
...Sender display, 15...Telephone circuit controller, T+, L...I, ...Intercom station, T, ...・Transmission line. shi;ji2soto' bu 3 2 loaves 4 door (,4) (B) (C)

Claims (1)

[Claims] 1. A plurality of intercom stations are connected to a transmission line, and a communication line is formed between the calling station and the called station using control signals from the call stations of these intercom stations, and the communication line is connected to a transmission line. In a multi-station intercom channel selection device for making calls using voice signals, the transmission line is commonly used for the control signal and the voice signal, and the intercom station is provided with a conversation circuit and a connection circuit, and serves as the calling station. The intercom station sends a destination signal for selecting the intercom station serving as the called station and a source signal of the calling station from its connection circuit to the transmission line, and then connects the communication circuit to the transmission line. , the intercom station serving as the called station is configured to connect the communication circuit to the transmission line when the connection circuit detects that the destination signal is the own station code. Multi-station intercom channel selection device. 2. The multi-station intercom channel selection device according to claim 1, wherein the destination signal is an intercom station code that was previously selected as the called station. 3. The multi-station intercom channel selection device according to claim 1, wherein the called station is a plurality of grouped intercom stations. 4. The multi-station intercom channel selection device according to claim 1, wherein the destination signal includes an interrupt prohibition signal for disabling call operations of other stations.