JPH04215326A - Sensor output transmitter-receiver - Google Patents

Abstract

PURPOSE:To allow a single reception section to discriminate the presence of detection by plural sensors. CONSTITUTION:When each base station equipment 5 receives a radio wave, a detection signal is sent to a base station controller 1. The detection signal of each base station equipment 5 consists of a pulse train having a specific time arrangement. Thus, even when part of each detection signal is duplicated, from which base station equipment 5 the detection signal comes is easily discriminated.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a system in which a single receiver receives the transmission outputs of a plurality of sensors, for example a mobile communication system such as a train radio system.

0002

[Prior Art] Fig. 4 is a diagram shown in the May 1986 issue of Tetsudo Tsushin, for example, and in the figure, 1 is a base station control device of a command center, 2 is an incoming base station display, and 3 is a base station. Dual Tone Multi Freq for detecting a tone signal indicating that there is a certain level of radio wave input
4 is a wired circuit connecting the control device 1 and each base station, 5a, 5b, 5
c is a wireless base station connected in series via wired line 4, 5a is the station closest to the command center, 5b is the second closest station, and 5c is n
The closest stations, 6a, 6b, and 6c, are 5a to 5c, respectively.
The antennas 7a, 7b, and 7c housed in the antennas 7a, 7b, and 7c correspond to the radio transmitters 8a, 7b, and 7c housed in the 5a to 5c, respectively.
a, 8b, and 8c are radio receivers housed in 5a to 5c, respectively, and 9a, 9b, and 9c are receivers 8a, respectively.
~8c squelch signals, 10a, 10b, 10c are relays operated by squelch signals 9a~9c, 11a,
11b and 11c are contacts that are switched within the relays 10a to 10c, and 12a, 12b, and 12c are 2 contacts that are unique to each base station.
It is a DTMF signal oscillator having wave tones and operated by squelch signals 9a to 9c. 13 is a mobile body, 14 is a wireless communication device mounted on the mobile body 13, and 15 is an antenna connected to the wireless communication device 14.

Next, the operation will be explained. For example, radio waves emitted from the antenna of the wireless communication device 14 of the mobile body 13 near the base station 5b may reach not only the nearby antenna 6b but also the distant antennas 6a and 6c.

[0004] At this time, the operation of each base station 5a, 5b, and 5c is such that when there is a radio wave input to the receivers 8a to 8c that exceeds the squelch sensitivity, the relays 10a to 10c operate, and the relay contact 11
A to 11c disconnect the lower wired line 4, connect their own receivers 8a to 8c to the wired line 4, and transmit their own DTMF signals. By separating each base station 5a, 5b
, 5c are transmitted redundantly, and the DTM
This is because it is possible to avoid failure of detection by the F signal detector. On the other hand, in this case, only the DTMF signal from the upper base station 5a is transmitted, so only the base station 5a is displayed on the incoming base station display 2 of the command center. In other words, even if a nearby base station receives the signal from the perspective of the mobile radio, the DTMF signal of the nearby base station is separated when it is received by a distant base station near the command center. Even though the station can receive DTMF signals with better sensitivity, only incoming calls from base stations far from the mobile station are displayed at the command center.

[0005] In such a case, each base station 5a, 5b, 5
It is conceivable to provide a wired line 4 and a DTMF signal detector 3 in each of the base stations c and to control them in parallel by the base station control device 1, but usually, each base station is located at a long distance, and this is not carried out for reasons such as cost. It is difficult to do so.

[0006] In addition, a line is branched to a base station midway,
In some cases, there are two lines. In this case, since signals are input from both lines at the branch point, the DTMF signals overlap and are not detected by the DTMF detector at the command center.

[0007]

[Problem to be Solved by the Invention] Since the conventional sensor output transmitting/receiving device is configured as described above, only the transmission from the information detecting section near the detection signal receiving section is received, and the transmission from the information detecting section located below is received. There was a problem in that the transmission was not received.

[0008] Furthermore, if a line is branched to the detection signal receiving section midway, resulting in two lines, the detection signals overlap because signals are input from both lines at the branch point.
There was a problem in that the detection signal was not detected by the detection signal receiving section.

The present invention has been made to solve the above-mentioned problems, and provides a sensor output that allows a single detection signal receiving section to receive detection signals transmitted from a plurality of information detection sections. The purpose is to obtain a transmitting and receiving device.

0010

[Means for Solving the Problems] Detection signals generated from a plurality of information detection sections are composed of a pulse train having a temporal arrangement unique to each information detection section.

[0011]

[Operation] In the present invention, since the detection signals generated from the plurality of information detection sections are composed of pulse trains having a temporal arrangement unique to each information detection section, even if a portion of each detection signal overlaps, each detection signal is detection signal can be determined.

0012

[Example] Example 1. An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, numerals 1 to 15 are completely the same as in the conventional example. 16a-16c are timer circuits that perform control operations at preset time intervals based on squelch signals 9a-9c output from receivers 8a-8c, and 17a-17c are self-station D
This is a synthesis amplifier that combines the TMF signal and the lower line signal. 101 is a time sequence indicating the DTMF signal transmission time interval of the first base station. 102 to 110 are time sequences indicating DTMF signal transmission intervals from the second base station to the tenth base station.

[0013] The signal transmission start time of each base station is set to be a different time for all base stations, and the second signal transmission interval is set to be a different time from that of four adjacent base stations.

In the reception display system configured as described above, when the mobile radio communication device 14 outputs radio waves near the base station 5b, the receiver 8b receives the signal from the antenna 6b.
The squelch signal 9b is turned on and the timer circuit 1
6b is activated and transmits the DTMF signal of the base station 5b onto the wired line 4 according to the time sequence 102.

[0015] At this time, when the signal is received by a far-off base station 5a, for example, the DTMF signal of the base station 5a is sent out on the wired line 4 according to the time sequence 101 by the same operation as described above. Other base stations whose squelch lines also operated are time sequences 103 to 103 of their respective base stations.
110, a DTMF signal unique to each base station is transmitted.

[0016] At this time, since the receiver squelch rise time of each base station varies, the start of the time sequence may be shifted and one of the two incoming signals may overlap, but the transmission of each DTMF signal There is a difference in time, and the other signal has a different sending interval, so it can be detected without overlapping. Additionally, if radio waves arrive at four or more distant base stations and the DTMF signal transmission times shift in the same direction, the DTMF detector 3 will not be able to detect it, but if the middle four stations are displayed, the train Since the location can be determined and calls are not made by specifying a distant base station, there is no practical problem.

Example 2. In the above embodiment, an analog signal is transmitted within the wired line, and each base station 5a to 5c is provided with a DTMF signal oscillator 12a to 12c, but the DTMF signal is transmitted using a number unique to each base station. It may also be a digital signal representing .

FIG. 3 shows that the base station number is digitized, modulated by modulators 18a to 18c, sent to line 4, demodulated by demodulator 19 in the base station controller of the command center, and then displayed on the display. In addition to exhibiting the same effects as in the above embodiment, it is also possible to send other information such as field strength information, which facilitates base station control.

In the above embodiment, the present invention is applied to train radio, but the present invention is not limited to this, and the present invention can be applied as long as it has a plurality of sensors and a single detector receives the signals from them. Anything is included as long as it does not depart from the spirit of the invention.

[0020]

As described above, according to the present invention, since the detection signals transmitted from the plurality of information detection sections are composed of pulse trains having a temporal arrangement unique to each information detection section,
It is possible to determine the presence or absence of detection in each information detection section.

[Brief explanation of the drawing]

FIG. 1 is a system diagram showing an embodiment of the present invention.

FIG. 2 is a time chart showing an example of signal sending time intervals of the present invention.

FIG. 3 is a system diagram showing another embodiment.

FIG. 4 is a system diagram showing a conventional sensor output transmitting and receiving device.

[Explanation of symbols]

1 Base station control device at the command center 2 Incoming base station indicator 3 DTMF signal detector 4 Wired circuit 5 Wireless base station 6 Aerial line 7 Wireless transmitter 8 Wireless receiver 9 Squelch signal 10 Relay 11 Contact 12 DTMF signal oscillator 13. Mobile object 14 Wireless communication device 15 Aerial line 16 Timer circuit 17 Synthetic amplifier 101-110 Time sequence

Claims (1)

[Claims] 1. A plurality of information detection sections each including a sensor section that detects external information and a section that receives the output of the sensor and transmits a detection signal, and receives the detection signal transmitted from these information detection sections. 1. A sensor output transmitting/receiving device having a single detection signal receiving section, the sensor output transmitting/receiving device being characterized in that a pulse train having a unique temporal arrangement is transmitted from a portion of each information detecting section that transmits a detection signal.