JPH01317029A - Ordering line call circuit - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Summary] For example, regarding a meeting line calling circuit used in a multiplex radio line including a plurality of intermediate relay stations, even if one forgets to reset the call switching device after the end of a call, the call to the own station can be recognized. 1 This is an omnibus meeting line using an in-band signal calling method used on multiple radio lines including multiple intermediate relay stations, with the purpose of automatically returning the call switching device. When making a call, the 9-call switch is switched to connect the transmitter and handset to the omnibus meeting line, but after one call is finished, the call switch is reset and the speaker unit is connected to the receiving side of the omnibus meeting line. a call signal detection means for transmitting a detection output when a call signal from another station is continuously detected for a predetermined period of time and the call switching device has not returned to normal, in a meeting circuit in preparation for a call from another station; A calling signal sending means is provided for applying the output of a built-in calling signal oscillator to the speaker section for a predetermined period of time using the output of the calling signal detecting means, and the call switching device is configured to be reset by the detection output.

[Industrial application field]

For example, the present invention relates to a meeting line paging circuit used in a multiplex radio line including a plurality of intermediate relay stations.

FIG. 3 shows an example of a wireless line configuration diagram. In the figure, a wireless terminal station A processes a signal sent from a carrier terminal station (not shown) for transmission over a wireless line, modulates the signal, and sends it out as a microwave signal to a lower station. Intermediate relay station B, C
, D relays radio waves from a wireless terminal station or an intermediate relay station of a higher-level station to a lower-level station. Then, the wireless terminal station E demodulates the received microwave, performs the reverse processing of the processing performed at the wireless terminal station A, and extracts the signal from the carrier terminal station (not shown).
Send to.

Here, for maintenance of an intermediate relay station, a meeting signal is sent, for example, from wireless terminal station A to wireless terminal station E.

Or, it is sent from wireless terminal station E to wireless terminal station A, but the format of the meeting line is an omnibus meeting line in which the content of the call between two stations is transmitted to all stations, and the calling method is 0. Signals within the audio band of 3-3.4 KHz 1 e.g. 44
0Hz is used as a calling signal to drive a speaker to send out a ringing tone, or to call the other party directly with voice (In band calli call).
ng ) is used.

Now, when making a call between stations using the above-mentioned meeting line, even if you forget to return the call switching device from the handset to the speaker after the call ends, the call will be recognized by your own station and the first call will be switched. It is necessary to allow the device to return automatically.

[Conventional technology]

FIG. 4 shows a block diagram of a conventional example, and the operation in FIG. 9 will be explained.

(1) When your own station is called by another station, a call from the other station, for example 440, is sent through the receiving side of the omnibus meeting line.
The Hz ringing signal is the call switching switch SW.

When the call signal is inputted manually via the amplifier 11, the call signal is amplified by the amplifier 11 and drives the speaker 12, so that it is known that the own station has been called. Therefore, the call switching switch SW.

Switch SW2 to the handset side, connect transmitter 4 and receiver 5 to the omnibus meeting line, and start talking to the other station.

Then, when the call ends, the call switching devices SW, SW2 are returned to their original positions so that calls from other stations can be recognized.

When talking using a handset, etc., the speaker circuit must be turned off to prevent howling.

(2) When the local station calls another station, when the calling switch SW3 is turned on, a 440 Hz calling signal from the calling signal oscillator 3 is sent to the other station through the transmission side of the omnibus meeting line. In contrast, the voice signal from the other party drives the speaker via the call switch SW+ and the amplifier 11, and the voice of the other party is transmitted.

Then, switch the call switch to the handset and start talking.

[Problem to be solved by the invention]

Here, the call switch switch sw,, sw, must switch to the handset side during a call and return to its original state after one call is completed, but if you forget to return it, the speaker side circuit and the omnibus meeting line will be connected. There is a problem in that the connection to the terminal is disconnected, so the caller's own station cannot be recognized.

An object of the present invention is to automatically restore the 1st call switch when the caller recognizes that the own station is calling even if the user forgets to return the 9th call switch after the end of the call.

[Means to solve problems]

FIG. 1 shows a block diagram of the principle of the present invention.

In the figure, reference numeral 6 denotes a calling signal detection means that sends out a detection output when a calling signal from another station is continuously detected for a predetermined period of time and the call switching device has not recovered, and 7 indicates the detection of the calling signal. This is a calling signal sending means that applies the output of a built-in calling signal oscillator to the speaker unit for a predetermined period of time.

Further, the switching device SW is connected to the output of the calling signal detection means.

Configure the software to restore the SW.

[Effect]

In the present invention, when a calling signal input from the receiving side of an omnibus meeting line using an in-band signaling system can be continuously detected for a predetermined period of time, and the call switching devices SW, SW2 have not returned to normal state, the calling signal detecting means 6 detects Send detection output.

The calling signal sending means 7 uses the above detection output to apply the output of the built-in calling signal oscillator to the speaker side for a predetermined period of time, drives the speaker, and sends out a ringing tone to indicate that there is a call. Inform. Further, this detection output drives the call switching devices SW+ and SWz to return to the original state.

As a result, even if the user forgets to restore the 1st call switch after the end of the call, the 1st call switch can be automatically restored when the user knows that his/her own station is calling.

〔Example〕

FIG. 2 shows a block diagram of an embodiment of the invention.

Here, the calling signal detector 61. AND gate 62.6
4.1 second timer 63 is a component of the calling signal detection means 6;
5 seconds Kuimuff 1. Calling signal oscillator 72. The changeover needle 4 indicates a component of the calling signal sending means 7. Also, the same reference numerals indicate the same objects throughout the figures. The operation of the figure will be explained below.

(If you forget to return the 1st call switch after completing 11 calls) The ringing signal detection circuit 61 has a built-in band pass filter (not shown) that extracts the 440Hz ringing signal, so the ringing signal from another station will not be input. while

For example, the detection output of l is outputted to the AND gate 62.

At this gate, when the state (switching information) of the call switch SW, SW, is as shown by the dotted line in the figure, that is.

Since 1 is added when it is not restored and O is added when it is restored, the AND gate 62 is turned on in the case of item (1).

Therefore, the output 1 of the ringing signal detector 61 is applied to the AND gate 64 through the ANT) gate 62, but this gate is turned on after 1 second by the 1 second timer 63 started by the output of the AND gate 62. , when the ringing signal continues for 1 second or more, an output from the AND gate 64 is applied to the 5-second timer 71 and the call switching devices SW+ and SW2.

For this reason, the 5-second timer 71 immediately starts operating and turns on the switch SW4, and after 5 seconds has passed, stops operating and turns off the switch SW4, so the calling signal oscillator 7
The ringing signal from 2 drives speaker 12, and speaker 1
A ring tone is sent from 2.

Also, since the call switch SW, SW, is restored, it is switched to the handset side and a call is started.

Here, the reason why the one second timer 63 is used is to prevent the calling signal detection means 6 from malfunctioning due to detection of a signal having the same frequency component other than the calling signal.

(2) When the 9 call switch returns after the call ends, the call signal from the other station is applied to the call signal detector 61 via the omnibus meeting line, so the detection output of 1 is sent from there to the AN
It is sent to D gate 62.

However, since the call switching switch SW has returned, the AND
Gate 62 remains off. Therefore, 1 second timer 6
The 3.5 second timer 71 is not activated and the 1-call switching device is maintained as it is.

That is, even if the user forgets to restore the 5-call switch after the call ends, the 1-call switch can be automatically restored when the user knows that his own station is calling.

〔Effect of the invention〕

As explained in detail above, 1.According to the present invention, after the end of the call, 2.
Even if you forget to restore the call switch, you can recognize that your own station is calling and automatically restore the call switch.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of the principle of the present invention, FIG. 2 is a block diagram of an embodiment of the present invention, FIG. 3 is an example of a wireless line configuration diagram, and FIG. 4 is a block diagram of a conventional example. In the figure, 1 is a speaker section, 4 is a transmitter, 5 is a receiver, 6 is a calling signal detection means, 7 is a calling signal sending means, and SW+ and SWz are call switching devices. Figures 1, 11, 22]

Claims (1)

[Claims] This is an omnibus meeting line using an in-band signal calling method used in a multiplex radio line including a plurality of intermediate relay stations.
) to connect the transmitter (4) and receiver (5) to the omnibus meeting line, but after the call ends, the call switch is reset and the speaker unit (1) is connected to the receiving side of the omnibus meeting line. In a meeting circuit that is connected to a meeting circuit and prepared for a call from another station, a ring signal detection means transmits a detection output when a ring signal from another station is continuously detected for a predetermined period of time and the call switching device has not returned to normal state. (6), and a calling signal sending means (7) which applies the output of the built-in calling signal oscillator to the speaker section for a predetermined period of time using the output of the calling signal detecting means, and the call switching device (SW_1) uses the detection output to , SW_2).