JP2775889B2 - Telephone device and telephone with intercom - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a telephone device with an intercom capable of making an extension call, which is constituted only by a plurality of terminal telephones connected to a common line.

2. Description of the Related Art Conventionally, as a telephone system for selectively connecting a plurality of terminal telephones to an outside line, a telephone system using a private branch exchange as shown in FIG. 6 or a control device as shown in FIG. And home telephones composed of terminals.
Both are connected to an outside line and are composed of a device having a switching function (hereinafter referred to as a main unit) and a plurality of terminal telephones, and are capable of making a call to an external line and a call between terminal telephones. In a system having such a main unit, the main unit can manage the use state of each telephone, that is, whether the telephone is in use or empty, based on data transmitted from each terminal telephone. The use state of another terminal telephone is displayed on the telephone.

In addition, there is a telephone system with an intercom including only terminal telephones without a main unit, and extension telephone calls between terminal telephones are possible as well as external telephone calls.

However, in a telephone system with an intercom without such a main unit, each telephone only transmits and receives a call signal at the time of calling an extension, and among a plurality of telephones connected in parallel, Data indicating the status of each telephone, such as which set is using an outside line, has not been transmitted / received, and therefore cannot be displayed to the user. Even if data indicating such a telephone state is transmitted / received, since a plurality of telephones transmit data to a single line in such a shared line system, data due to data collision is generated. Is highly likely to be destroyed. That is, when a plurality of telephones start transmitting data at exactly the same time, there is no method for detecting this, and there is a problem that the data is destroyed and a malfunction occurs.

SUMMARY OF THE INVENTION The present invention has been made in view of the above prior art, and provides a telephone device with an intercom that prevents data from being destroyed and does not malfunction.

Means for Solving the Problems In order to achieve this object, an intercom-equipped telephone device of the present invention generates, for each telephone, collision determination data composed of a plurality of pulses having different pulse intervals for each telephone. Collision determination data generating means, state data generating means for generating data indicating the state of the telephone, and communication data receiving means for receiving various data put on a common line,
When one of a plurality of telephones transmits data, the first pulse is transmitted to a common line after confirming that there is no data from another telephone, and thereafter, the other telephone transmits data. The second pulse is transmitted only when it is confirmed that there is no data from another telephone, and then the data from the state data generating means is transmitted to the common line. If data from another telephone is detected before transmitting the first pulse, or another telephone is transmitted between the time when the first pulse is transmitted and the time when the second pulse is scheduled to be transmitted. When data from the communication data transmission unit is detected, transmission of the subsequent data by the communication data transmission unit is stopped.

Operation With the above configuration, when a certain telephone sends the first pulse to the common line, it is determined whether or not there is data from another telephone on the common line, and there is no data from the other telephone. The second pulse is sent out only when is confirmed. Even if the other telephone transmits the first pulse simultaneously, the second pulse of the other telephone does not overlap with the second pulse of the above telephone, and either pulse is transmitted first. Then, the other telephone receives the signal, and the receiving telephone abandons the line without transmitting the second pulse, and the frequency of transmitting the pulse to the line can be reduced.

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a functional block diagram of a telephone constituting an intercom-equipped telephone according to an embodiment of the present invention. First
In the figure, reference numeral 1 denotes a key input unit for operating the telephone. Reference numeral 2 denotes a key data processing unit that performs a process corresponding to each key of the telephone, 3 denotes a state data generating unit that generates data representing the state of the telephone, and 4 outputs a data signal in accordance with the operation and status of the telephone. A communication data transmitting unit, 5 is a collision discrimination data generating unit, 6 is a communication data receiving unit for receiving data output from other telephones and the self, and 7 is a content analysis of input data and data by a method described later. A communication data discriminating unit for discriminating a collision of the telephone, a control unit for controlling the telephone by a signal from the communication data discriminating unit and the key data processing unit, a voice communication unit, and a signal input / output line.

FIG. 2 is a diagram showing a data discrimination signal for detecting a data collision and a transmission pattern of a data signal following the data discrimination signal. The first two pulses P1 and P2 are data collision determination signals, followed by the original data signal. Then, when this first pulse for collision determination is transmitted,
Next, the communication data discriminating unit 7 is configured to perform the data fetching process for at least nT seconds plus some time. Also, the communication data discriminating unit 7 regards itself as having a priority if the next pulse is detected nT seconds after the first pulse is transmitted, and conversely, the first pulse is transmitted. If an external pulse is detected before nT seconds elapse after transmission, it is configured to consider that there is another priority. Further, even in a standby state, if an external pulse is received, data transmission is not performed for a predetermined period thereafter.

In FIG. 3, reference numeral 11 denotes a common line provided for the intercom function, and each signal input / output line 10 of the telephone terminal configured as described above has a common line 11 as shown in FIG. Connected to.

Next, the operation will be described. Here, a description will be given as a system that can connect up to five units. First, at the time of initial setting, a set number n (n = 1 to 5) of the telephone is input from the key input unit 1 of each telephone. Thereby, the time between two pulses of the collision determination signal in the data signal shown in FIG. 2 is set to nT seconds for the set of the set number n.

Next, an operation when one telephone in the intercom system transmits data will be described. First, the communication data discriminating unit 7 performs a data fetch process from the communication data receiving unit 6. When it is confirmed by the signal from the communication data receiving unit 6 that the other telephone is not transmitting data, the collision determining data generating unit 5 outputs the collision determining data shown in FIG. Common line 11 through
Sent to Then, data indicating the state of the own telephone is output from the communication data transmitting unit 3 and transmitted to the common line 11.

Here, for example, immediately after the telephone set number 3 has transmitted the collision determination data as shown in FIG. 4 (b), the telephone set number 2 is to transmit data as shown in FIG. 4 (a). A description will be given of the case in which this is done. When the telephone set No. 3 transmits the first pulse for collision determination, the communication data determination unit 7 of the telephone set performs the data fetching process for at least 3T seconds plus some time. By the way, in this case, immediately after the telephone of the set number 3 transmits the first pulse, the telephone of the set number 2 tries to transmit the first pulse. Is received by the telephone set number 2, so that the telephone set number 2 stops transmitting data, and no data for collision determination is transmitted. Then, the telephone set No. 3 detects the next pulse only after 3 T seconds from the transmission of the first pulse, so that the telephone set is regarded as having priority. Then, the telephone set No. 3 transmits a data signal after transmitting the second pulse.

However, for example, as shown in FIG. 5, when another telephone starts transmitting data at the same time as that telephone, the first pulse P1 of the collision determination data in the data signal is transmitted.
Will overlap. In this case, the priority is not determined when the first pulse is transmitted. However, since the interval until the transmission of the second pulse differs for each set, the second pulse is always transmitted by one of the telephone sets first. The communication data discriminating unit detects that the second detected pulse is different from its own output by the communication data discriminating unit, and determines that the telephone has no priority, and determines the data after the second pulse of the collision discriminating signal. Transmission will be stopped.
As a result, the data of the other telephone can be transmitted without being destroyed.

For example, assuming that the telephone set number 2 and the telephone set number 3 simultaneously transmit data as shown in FIGS. 5 (a) and 5 (b), the interval between the two pulses of the collision determination data is set number 2 The telephone of set number 2 receives 2T seconds, and the telephone of set number 3 receives 3T seconds. Therefore, the telephone of set number 3 receives the second pulse of the collision determination signal of the telephone of set number 2, and the other telephone transmits data. It is determined that the transmission has been performed, and the subsequent transmission of data is stopped, and only the telephone set number 2 transmits data.

As described above, the present invention provides, in each telephone, collision determination data generating means for generating collision determination data composed of a plurality of pulses having different pulse intervals for each telephone, and data indicating the state of the telephone. Is provided, and communication data receiving means for receiving various data on the common line is provided, and when one of the plurality of telephones transmits data, the data from other telephones is transmitted. After confirming that there was no data, the first pulse was sent to the common line, and then it was determined whether or not another phone sent data, and it was confirmed that there was no data from another phone. Only if the second pulse is sent, then the data from the state data generator is sent to the common line, and if data from another telephone is detected before sending the first pulse, or Ocular When data from another telephone is detected during the period from when the pulse is transmitted to when the second pulse is scheduled to be transmitted, transmission of the subsequent data is stopped. Each time the state changes, the state data is sent out on the common line, and it can be confirmed by another telephone, so that the user can immediately know the use state of the other telephone and When one of the telephones transmits data, it can recognize that there is a telephone that transmitted the data in addition to itself, and can stop subsequent data transmission. Prevents the destruction of the contents and eliminates the malfunction caused by the destruction of the data. In addition, immediately after transmitting the first pulse of the collision determination data, the presence or absence of data from another telephone is determined. And abandon the line when data from another telephone is detected, so the frequency of sending pulses to the line is low, and the time until the line is abandoned is relatively short. The effect is great.

[Brief description of the drawings]

FIG. 1 is a functional block diagram of an example of a telephone constituting the telephone device with an intercom of the present invention, FIG. 2 is a configuration diagram of collision determination data and data signals of the telephone device with an intercom, and FIG. FIG. 4 and FIG. 5 are explanatory diagrams for explaining data transmission timings of two telephones in the intercom-equipped telephone device, and FIG. 6 is a diagram showing a conventional private branch exchange. FIG. 7 is a schematic configuration diagram of a conventional home telephone. DESCRIPTION OF SYMBOLS 1 ... Key input part, 2 ... Key data processing part 3 ... State data generation part 4, ... Communication data transmission part 5 ... Collision discrimination data generation part 6 ... Communication data reception part, 7 ... Communication data Discriminating unit 8 Control unit 9 Voice communication unit 10 Signal input / output line 11 Common line

Claims (2)

(57) [Claims] 1. A telephone device in which a plurality of telephones are connected to a common line, wherein each telephone has status data generating means for generating status data representing the status of the telephone at the time, Collision determination data generation means for generating collision determination data composed of a plurality of pulses having pulse intervals, collision determination data generated by the collision determination data generation means or state data generated by the state data generation means, Communication data sending means for putting on a common line connected in parallel; communication data receiving means for receiving various data put on the common line; and when one of a plurality of telephones sends communication data, After confirming from the signal from the communication data receiving means that no other telephone is transmitting any data, the first packet of the collision determination data is checked. To the common line, and then determine whether or not the other telephone has transmitted any data.Only when it is confirmed that the other telephone has not transmitted any data, the collision determination data is transmitted. A second pulse is transmitted, and thereafter, the communication data transmitting means is controlled so as to transmit the state data from the state data generating means to the common line, and the first pulse of the collision determination data is transmitted to the common line. Between the time when the first pulse of the collision determination data is transmitted and the time when the second pulse is scheduled to be transmitted, or when data such as from another telephone is detected before transmission to the A telephone device with an intercom, comprising: a determination unit that controls to stop transmission of subsequent status data and communication data when any data from another telephone is detected. 2. State data generating means for generating state data representing the state of the self at that time; collision judgment data generating means for generating collision judgment data composed of a plurality of pulses having their own pulse intervals; Communication data transmitting means for putting the collision discrimination data generated by the collision discrimination data generation means or the state data generated by the state data generation means on a common line connected in parallel with each telephone; and inputting from the signal input / output line Communication data receiving means for receiving various data, and when the own telephone transmits communication data, after confirming from the signal from the communication data receiving means that other telephones are not transmitting any data, The first pulse of the collision determination data is transmitted to the common line, and thereafter, it is determined whether or not another telephone has transmitted any data. Transmits the second pulse of the collision determination data only when it is confirmed that no data is transmitted, and then transmits the state data from the state data generating means to the common line. The data transmission means is controlled, and if any data from another telephone is detected before transmitting the first pulse of the collision determination data to the common line, or the first pulse of the collision determination data is transmitted. If any data from another telephone is detected before the time when the transmission of the second pulse is scheduled after that, the transmission of the subsequent status data and communication data by the communication data transmitting means is performed. A telephone, comprising: a determination unit configured to control to stop.