JPS60137162A - Talk control method of carrier type interphone system - Google Patents

Abstract

PURPOSE:To utilizing a less number of channels effectively by deciding on priority among all channels and allowing all stations in stand-by mode to stand by while selecting a channel having top priority among free channels. CONSTITUTION:For example, there are seven interphones 1, as stations No.1- No.7 which have a mutual communication on electric power carrier basis, and the priority is determined in the order of three channels CHs of carrier frequencies f1, f2, and f3. Then, all stand-by stations stand by with the CH of f1. Assuming that the stations No.1 and No.2 have a communication, the code of the station No.1 and the code of the station No.2 are set with a code setting switch and the stations are called over the CHf1 to allow the mutual communication. In this case, other stations stand by with the CHf2 automatically. Similarly, when the stations No.3 and No.4 have a communication over CHf2, other stations stand by with CHf3, and when the stations No.5 and No.6 have a communication over CHf3 and there is no free channel left, the busy lamp of the station No.7 turns on. When some communication ends and a free CH is obtained, stand-by stations stand by with CH with top priority among free CHs automatically.

Description

[Detailed Description of the Invention] <Field of Application in Industry> The present invention is directed to a power line carrier type intercom system having a plurality of stations, so as to make effective use of limited channels to make calls. The present invention relates to a call control method for making calls.

<Prior art> Power line carrier type intercom system does not require dedicated lines between each station, so it can be installed easily and at low cost.
It has the advantage of being able to move freely as long as there is a power outlet and there is almost no interference with the installation location.
In order to eliminate this problem, a dedicated channel between two specific stations, that is, a carrier frequency -! Must be set cold. Therefore, N
@l channel power C is required, and as ■'s i1t [ becomes larger, the number of channels to be prepared increases suddenly and dramatically, making it difficult to prepare, so the number of stations set in one system is There was a problem that I couldn't do that much.

<Purpose of the invention> The present invention focuses on a single problem stock like the one mentioned above, and compares rθ
This invention was made with the aim (i) of providing a call control method that can utilize a small number of channels to configure a carrier intercom system having many stations.

<Structure of the Invention> In order to achieve the above object, the present invention provides a system in which a plurality of intercoms for making calls are installed on a power line,
In intercom systems with a limited number of available channels, priority N is given to all channels.
Set X1, and all stations on standby always select the channel with the highest priority even if it is an empty channel. '# If you are defeated and need to make a call, make a call 2
The present invention is characterized by specifying two stations to be in a talking state by transmitting and receiving a calling signal representing the stations, and controlling the two stations to communicate with each other using the channel selected during standby. There is.

Therefore, according to the invention, each channel
Not limited to use between stations, all stations are given the opportunity to start a call using the channel with the highest priority 4iγ among empty channels, making full use of relatively few channels. This makes it possible to make calls between many stations.

<Embodiment 1> Hereinafter, the present invention will be explained in detail with reference to an illustrated embodiment.

FIG. 1 is a front view of 41 breasts II of an intercom constituting each station of the intercom system according to the present invention;
FIG. 2 is a four-legged schematic block diagram. In the first part,
1 is an intercom, and the intercom is equipped with a talk button 2, a hand hood 3, a deaf display lamp 4, etc., so that the user can operate and confirm the status. + In Figure 2, 1
1 is a modulator/demodulator that modulates the general transmission signal with an audio signal or demodulates the received carrier wave; 12 is the frequency of the carrier wave;
Easy to switch channels! l1JJ switch, ]3
is the talk switch that is activated by 1-Khotan 2, and 14 is operated by the other party code 3 power button 3'
[The target hood setting switch, 15 is the audio amplification device,] 6 is the speaker, 17 is the carrier wave amplification crystal, 18 is the filter, 19 is the Sabai heat exchanger, 20 is the outlet, 2
1 is the Ipb4 of each of these sounds? 1III@su7・
It is control 2 humble. 22 indicates a power line.

When making a call, first operate the other party's code setting button 3, and the control unit 21 outputs the own station code and the 41i code of the 1st station code as a 0 hand code, and modulates it with the modulation/demodulation 2/11. The resulting carrier wave is transmitted from the outlet 20 to the power line via the carrier line 17 and the coupler 19.

In addition, the called partner station receives the transmitted carrier wave via the outlet 20, the coupling 2 19, and the filter y+8, demodulates it with the modem 1j, identifies the calling code with the controller 21, and then sends the carrier wave to the called station. When it recognizes that the call has been received, it enters call mode, presses the talk button 2, and is ready to send and receive calls to and from the calling station, ending the call.
An exit code is output to f.

Channel yourself here! The PL switch 12 selects the highest priority among the vacant channels in the standby mode based on the f priority order set in advance for the plurality of history channels. Always choose channels with high
When the call between the two stations of sh < channel power l (L' and the call code of the first 8 stations of the call + 1H is confirmed to have entered the historical state, the channel automatically goes to the next priority channel of 4. The controller 21 is configured to automatically switch to the channel with the highest value σ among the available channels, including the channel that has been used, and the end code is received. In addition, when there are no available channels, the indicator lamp 4 lights up to indicate that all channels are in use, and at the same time the call start procedure, i.e., the call code, is activated. Yuu I whose outgoing calls are ignored
J power? The control is performed by the li+l control unit 21.

Next, let's assume that intercom 1 is No. 1, and there are 7 stations from 1 to No. An example will be explained using the drawings from FIG. 3 onwards.

Figure 3 shows 11. when all stations are in standby mode. Indicates the status of ¥, and the channel r with the highest f priority of 4 for each station
1 is selected and it is on standby.

゛Here, as shown in Figure 4, No. 4 horsepower C own station code V.''
oooi” followed by No, the code for the second station “’001 (
1", each station below No. 2 receives this call hood, identifies whether the call is phantom to its own station, becomes No. 2 C call mode, and No. 1.
As shown in FIG. 5, the transmission and reception status with the station is established. These calls and conversations are made using channel f, and the calls from No. 003 to No.
, 7 selects the next priority channel f, and enters a standby state.

If the call between No. 1 and No. 2 ends in this state, the situation returns to the state shown in Figure 3.
o, While station 1 and station No-2 are talking, station No. 003 calls,
If there is a 0 move power C to the 4th station, channel ``ll' at 2''
T-out code ``'ooiiiioiooo'' force is sent,
As shown in Figure 6, channel f2 is used between station No. 003 and station No. 4 for a total of 8 occupancies? Ite naware, No, j
- Each station No. 7 is in a 1-draw state on channel f3.

Similarly, in this example, channel f of 31 at the same time
,,r2. (Using the history of
(If the intercom 1 is not involved in the call, the indicator lamp 4 will light up as shown in the No. 7 station in Figure 7, indicating that the circuit is in use (BUSY).) and wait until one of the channels becomes free.

From the state shown in Fig. 7, when the communication power of No. 3 station and No. 4 station ends, as shown in Fig. 8, No. 3 station, No. 4 station,
Each of the intercoms 1 of No. 7 stations goes into a standby state on channel r2, and after that, the communication power of No. 1 station and No. 2 station, which were using channel f for communication, ends, and the communication power of No. 2 station is terminated. has higher priority than 12 (because it is higher,
As shown in FIG. 9, the stations other than the No. 5 station and the No. 6 station are in a different state depending on the channel f1.

In this way, each intercom 1 has the following signals: Iso$Jmi, which selects the highest priority channel, own station code transmitter m11B, and receiver (U
Four food identification channels are allocated, and each station is given an equal opportunity to use the three assigned channels, and each station is given the same opportunity to use the channels. . In addition, in this first column, the force is explained assuming a breath-talk type intercom.
It is. In this case, twice the number of channels as the pre-stressed type is required, so the present invention, which allows effective use of limited channels, is considered to be particularly effective in the case of a simultaneous call type intercom.

<Effects of the Invention> As is clear from the explanation in Section 2 below, according to the call control method of the present invention, individual channels are not limited to use between two specific stations, and all stations can use empty channels. Most priority 1
The channel selection is done in an orderly manner as you are given the opportunity to use the highest ranked channel to make the call.
Effectively using the limited channels without causing i'iL is the key, and the constraints on the number of channels that can be placed in one system are greatly reduced.

[Brief explanation of the drawing]

Fig. 1 is a schematic front view of the -fit of the intercom implementing the present invention;
9 to 9 are explanatory diagrams of usage states. 1...Intercom, 11...Modulator/demodulator 12...
・Channel independent J switch 21...Control MG 22...Power line applicant Sharp Corporation IuJ! Capital Harumi Hanging 1 Figure 3 Drunk 4 Construction Bacteria 6 Behavior 4 噸 1 Fortune 1 (1-Dragon Record Reception Area ← iken 1t
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Claims (1)

[Claims] Multiple intercoms are installed to make calls using the power line.
In an intercom system where the number of usable channels is limited, priority orders are set for all channels, and all stations on standby are always placed in the priority order of the empty channels. When making a call, you can identify the two stations that will be in a call state by sending and receiving a ringing signal that represents the two stations that will make one call. A call control method for a carrier type intercom system, characterized in that control is performed so that mutual calls are made using the channel selected while two stations are on standby.