JPH03166830A - Radio guide system - Google Patents

Abstract

PURPOSE:To enable people to move while hearing explanatory guidance, place by place, by laying plural leakage cables on a premises, sending different program signals separatedly, and making moving people nearby the cables receive the signals through portable receivers. CONSTITUTION:A moving person M1 carries a receiver 4 and moves in a zone A as shown by an arrow. A program signal radio wave SA from a transmitter 2A is sent from a leakage cable 1A in a span A, so the radio wave SA is received by the receiver 4 and its explanation can be heard at the site. When the moving person M1 further moves forth to enter a blank zone 3, the receiver 4 receives radio waves SA and SB of both zones A and B and mutes the received signals. When the moving person M1 furthermore moves forth to enter a zone B where the ratio of a desired wave and a disturbing wave is >=6dB, the radio wave SB sent from a leakage cable 1B is received. Therefore, the explanation corresponding to the place can be heard and similar operation is repeated.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a wireless guide system that wirelessly provides guidance and explanations at various indoor and outdoor venues such as exhibitions and museums. (Prior art) Conventionally, in order to wirelessly communicate different program contents within the venue, each program is communicated using a different frequency, and the person receiving the signal carries the receiver and transmits it within the venue. In order to receive explanations at each location while walking, it was necessary to change the tuning of the receiver. (Problem to be solved by the invention) In the conventional technology, the tuning of the portable receiver must be changed one by one according to the situation at the site. There was a serious drawback in that the recipient's mistake in switching the selection switch resulted in the recipient receiving an explanation that was completely different from the actual situation. (Means for Solving the Problems) The present invention has been made in view of the shortcomings of the prior art, and involves installing a plurality of leaky cables with a predetermined span in a premises in advance, and transmitting different program signals to each leakage cable. While transmitting the program signal to the cable, the traveler can receive the program signal using a receiver carried near the leaky cable and listen to the explanation appropriate to the situation at that location. (Function) By carrying a receiver while moving, a person traveling can listen to explanations and guidance at that location, and once that is finished, move on to the next location and listen to the explanation of that location. In this way, you can move around the venue while listening to the explanations. (Example) In the example shown in FIGS. 1 and 2, 1A, 1B
, 1C, 1D, etc. are leaky cables laid within the venue, divided into fixed spans, each connected to a separate communication device, and each transmitting a separate program using FM modulation. Parallel cables, leaky coaxial cables, etc. are used as the leaky cables. The leakage electric field strength is a weak electric field regulated by the Radio Law, and is less than 500 pv at a distance of 3 meters. A leaky cable IA is installed in the A span, and a program signal radio wave SA modulated on a carrier wave fA is emitted from a transmitter 2A via an electric wire 5A. Therefore, this program signal radio wave SA
The area that can receive this is the A zone. Similarly, leakage cables 1B and Ic. ID ●●● is installed and carrier wave fB. fC. f
Program signal radio waves SB, SC, S modulated by D●●●
D●●● is emitted. Therefore, the range in which these program signal radio waves SB, SC, and SD ●●● can be received is the B zone, C zone, and D zone ●●●. The carrier waves fA and fB described above have a frequency difference of approximately IKHz. Further, carrier wave fA and carrier wave fC have the same frequency, and carrier wave fB and carrier wave fD have the same frequency. Therefore,
Carrier waves fA, fC and carrier waves fB, fD radiate program signal radio waves SA, SC and program signal radio waves SB, 5D with a frequency difference of IKHz. 3 is a blank zone where each leakage cable (IA, IB, I
C, ●●●) indicates the band between the end and start end of the signal radio wave SA
and SB or signal radio waves SB and SC are mixed. That is,
The program signal radio waves of each adjacent leaky cable are IKH.
They are radiated and mixed with a frequency difference of z. MIM2 ●●● is a moving person who carries the receiver 4 and receives each program signal radio wave SA, SB, SC by moving along the leaky cables IA, IB, IC●●● mentioned above.
You can receive ... and listen to explanations and guidance that match the situation at the site. Now, the moving person M1 moves in the direction of the arrow without receiving the program signal radio wave SA in the A zone, and when it reaches blank zone 3, the program signal radio wave SA from the A zone and the program signal radio wave SB from the B zone are transmitted. You will receive both. Then, the receiver 4 detects the beat between the program signal radio wave SA and the program signal radio wave SR, and when it exceeds a certain level, it operates to mute the received signal (no sound) so as not to output meaningless interference noise sound waves. It is under pressure. 6 is a beat detection section of the receiver 4, and when a beat between two program signal radio waves is detected, a control section 7 automatically functions to mute the received signal so that it is not output from the output section 8. 6A is a level polyum and has the function of adjusting the muting operation level. In Fig. 2, RF is a high frequency amplification, MIX is a frequency mixer, OSC is a local oscillator, IFAMP is an intermediate frequency amplifier, LIM is a limiter, DISK is a selector, and SQ (Squ) is a high frequency amplifier.
lch, squelch) is a switch, AF is a low frequency amplification, B
PF means band pass filter.

Next, the usage mode will be explained.

Traveler M1 moves in zone A in the direction of the arrow without carrying receiver 4. At this time, since the program signal radio wave SA is being emitted from the A-span leaky cable IA, the mobile person M1 receives the program signal radio wave SA through the receiver 4 and outputs an explanation that matches the situation at the scene from the output section 8. You can hear. Mover M! further advances in the same direction and enters the blank zone 3, the receiving Ia4 receives the program signal radio wave SA of the A zone.
and the B zone program signal radio wave SR will be received. Therefore, the beat detecting section 6 of the receiving unit 14 detects a beat, and the control section 7 operates to mute the mixed received signals so that no sound is output from the output section 8.
On the other hand, the migrant M. continues in the same direction and enters the B zone where the ratio of the desired wave to the interference wave (d/u ratio) is 6 dB or more, the program signal radio wave SR" emitted from the leaky cable IB of the B span 4 receives and output section 8
You can listen to explanations that are more tailored to the situation. The same operation is repeated thereafter. (Effects of the Invention) Since the present invention has the structure and operation described above, it has the following unique effects. Since you can automatically receive the appropriate program signal radio waves unique to each zone from the leaky cable, you can listen to explanations that match the situation at that location without having to go through the trouble of switching tuning as in the past.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of the main parts of the present invention, and FIG. 2 is a block diagram of the receiver. IA, IB, Ic, ID●●●Leakage cable SA, SB
, SC, SD ●●● Program signal radio wave 3 ●●● Blank zone 4 ●●● Receiver MI M2 ●●● Traveler

Claims (2)

[Claims] (1) A leaky cable (1A,
1B, 1C, 1D...), and each leakage cable has its own program signal radio wave (SA, SB, S
C, SD,...) and receive the program signal radio waves in each zone using a receiver 4 carried by a traveler. (2) A leaky cable (1A,
1B, 1C, 1D...), and each leakage cable has its own program signal radio wave (SA, SB, S
C, SD,...) and receives the program signal radio waves in each zone by the receiver 4 carried by the moving person, while receiving the beats due to mixed radio signals in the blank zone 3 between the respective spans. A radio guide system that is detected by the device 4 and muted to prevent mixed radio signals from being emitted from the output section 8.