JPS58143637A - Radio repeating system - Google Patents

Abstract

PURPOSE:To eliminate the interference disturbance due to the same reception of the same electric wave, by setting a time difference among transmitting electric waves to be sent to plural repeaters. CONSTITUTION:The audio signal sent through a mike 16 is supplied to a modulator 11a and a sound recorder 13. At the same time, a selecting signal P1 is supplied to the modulator 11a from a generator 14a through a contact 12b, and the audio signal and an electric wave 4 modulated by the signal P1 are radiated from a transmitter 11b. Repeater stations 2a and 2b transmit audio signals to a modulator 23a via a receiver 20b and a demodulator 20a and at the same time discriminate the selecting signal by receivers 21a and 21b. A relay 22 is started as the receiver 21a extracts the signal P1, and then a contact 22a of the relay 22 is closed. Then an electric wave 5 is transmitted to a receiving station 3a from a transmitter 23b. When this repeating operation is over, an on-hook switch 15 is closed. As a result, the recorder 13 is reproduced and at the same time the contacts 12a and 12b are switched. Then the wave 4 which is modulated by a reproducing signal and a selecting signal P2 is transmitted. The station 2b performs a repeating action with detection of the signal P2.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a wireless relay system for broadcasting or broadcast communication using the same carrier frequency.

In general, in wireless communications, when attenuation due to mountains etc. is large, or when the radio waves cannot reach directly due to a wide communication area, a relay method is generally used in which the radio waves are first transmitted through a place where the radio waves can easily pass through. It is true.

FIGS. 1 to 3 show relay systems that have been used in the past.

In Figure 1, (1) represents the transmitting station, ■ represents the relay station, (Mackerel represents the receiving station, and (4) represents radio waves (for relay stations) (61 represents radio waves (for receiving stations)!). .

Furthermore, if the communication distance or attenuation 1 communication range is larger or wider, one relay station cannot handle the problem, and it is necessary to install a plurality of relay stations as shown in FIGS. 2 and 3.

Figure 2 shows an example of a radial arrangement, and Figure 3 shows an example of a serial arrangement. (1) is a transmitting station, (2m) and (2b) are relay stations (3
m) (3b) is the receiving station, (4) is the radio wave (for relay station),
(5g+) (5b) is a radio wave (for receiving station) (6) in Figure 3
represents radio waves (for relay).

In Fig. 1, the radio wave (4) of the transmitting station α) is transmitted from the relay station (2!
The relay station (the relay station) amplifies it to the required level ν and transmits the radio wave (6), and this radio wave (5) is transmitted to the receiving station (3).
) Kyop is received.

In the case of Figure 2, the radio wave (4) from the transmitting station (1) is received by the relay station (2m) (!b) and transmitted to the relay station (2g) (L
lb) H Relay and amplify the received radio waves (4) respectively to produce radio waves (l1m) (5b) 1"ili 'fW L, j
tL La ni wave (5m) (5b) 12 receiving stations (1m) (3
b).

In the case of Fig. 3, the radio wave (4) of transmitting station α) is transmitted to relay station C2.
It is received by aWC and transmits radio waves (for relay) (6) along with relay station (21 company radio waves (61)).Radio waves (21m) +
The radio wave (6) is received at the 2nd receiving station (3rd station), and the radio wave (6) is sent to the relay station (3rd station).
gb*, and the relay station (Ib) transmits the H radio wave (8b) to the receiving station (3b).

By the way, in this mushroom, the relay station (
Radio waves (l1m) (lb) transmitted from 1m) (2b)
A! In the case of the same carrier frequency, the receiving station (3a) K as shown by the chain line
Both radio waves (5m) CIbIb borrowed reception station b) also both radio waves (21m) (lib) 2! (As a result of being received at the same time, mutual radio interference occurs, resulting in beat disturbances, increased noise, and deterioration of call quality.In order to reduce this radio wave interference, the frequency should be highly stabilized, the modulation depth should be equalized, and the modulation phase should be Although measures such as synchronization of radio waves and direction selection of incoming radio waves were taken, they were not perfect, and failures were inevitable.

The present invention eliminates the above-mentioned drawbacks of the conventional technology in applications where some time difference can be tolerated depending on the region.

The object of the present invention is to provide a wireless relay system that can eliminate interference caused by reception of the same radio wave by transmitting radio waves from multiple relay stations with a one-hour difference instead of transmitting them at the same time.

Hereinafter, one embodiment of the present invention will be described using FIG. 4. Note that the present invention can be applied to both the radial relay shown in Fig. 2 and the serial relay shown in Fig. 3, but in Fig. 4, the case where the radial relay shown in Fig. 2 is used will be explained. . Fourth
In the figure, transmitting station 0) is a modulator (ll@)% transmitter (l
lb), relay 021. Relay contact (12m) CIT
o) Recorder I1 selection signal generator (14m) (lib)
% end call switch and! On the other hand, the relay station (2m) (Ib) TF demodulator (ZO
i) s receiver (20b), selection signal receiver (211
) (lib), relay (2), relay contact (zza)
, a modulator (21m), and a transmitter (23b).

Here, the functions of each component are that the modulator (111) modulates radio waves (carrier waves) according to the communication content, the recorder 03 records and plays back the communication content by the microphone 611, and the call end switch 06 allows rewinding and playback, during which the relay Oz is driven and its contacts (11m) (1
2b) 25g switched 0 selection signal generator (141)
(14b company, relay station (2m) (2b) selection signal P1e
It generates P#. relay station (za) (Ib
)0111 receiver (20b) and demodulated ml (20m
) receives and demodulates the radio wave (4), and the 1 selection signal receiver (21m) (21b) receives the selection signal Fly'a from the transmitting station 0) and selects the signal type P1 or P1.
, is used to detect.

When microphone M is used for broadcasting, broadcasting, or broadcast communication, the sound is converted into an audio signal electrically by the microphone (IQ) and transmitted through a 5% contact (12a) (D) to a modulator (
l1m) and the audio signal is input to the recorder 01.
will be recorded. In addition, the selection signal generator (port a) has a contact (12
b) activated by P, the signal is modulated by the modulator (lli)
K input through, transmission fa (ob) C'R key n (11m
) is the audio signal and the selected signal f is the radio wave modulated by PI [
41t' Send. Radio wave (4) is relay station (2m) (Ib
In this case, the selected signal is received by the receiver (20b), demodulated by the demodulator (Boa), and the selected signal is identified by the selected signal receiver (21) (21b).

Because the radio wave (4) is modulated by the selection signal P1.

The selection signal receiver (211) starts up, but the selection signal receiver (2
1b) is not activated and relay station (2m) (2b) C) selection is performed here. That is, when the selective receiver (21m) of the relay station (2a) is activated, the relay is driven and its contacts (22m) are closed, and the transmitter (23b) performs a transmitting operation.The output of the demodulator (20m) is connected to the modulator 111 (23m), so the demodulated audio signal is changed i)[1(23m)
i) Apply modulation to the transmitter (23b) via t. This transmitter (!3b) transmits radio waves (51) and radio waves (5a
) is received at the receiving station (3a). On the other hand, the relay station (2b
), the selection signal m (21b) is not activated.
The relay is not activated, so the contact (22m) is not closed, the transmitter (23b) does not transmit the radio wave (5b), and multiple transmissions are not performed at the same time.

Next, after this relay operation is completed, when the end switch 0 is closed, the recorder (II) rewinds from the recording position and starts playing from the recording start position.During this playback, the recorder αj
An output is generated to drive relay Q2), which drives relay 0z, and its contact (12m) (12b works!) is switched, and the playback audio signal of the recording changes through contact (lta).
It is input to the 1 unit (11m). Also, the selection signal generator (port b) is activated by the contact (1!b), and the selection signal P changes to N.
The transmission 111 (llb) is input to the IL (l1m), and the modulator (l1m) outputs the recorded playback audio signal and the selection signal P,
transmits radio waves (4) modulated by

Radio wave 14) is relay station (2m) (2b) O receiver (20b
), demodulated by a demodulator (two axes), and identified as a selection signal Plp'l by a 1 selection receiver (211) (llb).

In this case, since the radio wave (4) is modulated by the selection signal P, the selection signal receiver (21
b) is activated but the selection signal receiver (21m) is not activated. By activation of the 0 selection signal receiver (21b), the relay (
The transmitter (23b) is driven at the contact point (42m).
) t-start. The demodulated audio signal of the demodulator (201) is sent to the transmitter (via the modulator (z3s) t, as in the previous case).
modulation is applied to the radio wave (5 llb) from the transmitter (23b).
b) is transmitted and received by the radio wave (SBN receiver (3a)).

In the above embodiment, the broadcast or broadcast communication is performed using the microphone 0. However, it is also possible to use a voice signal or a coded signal.

In addition, in this explanation, the selection signal is assumed to be selected continuously at the same time as the voice signal during communication, but it is sent for a short time at the beginning of the call, and is self-maintained after being identified by the relay station (21) (2b).
A call-end signal may be provided separately, and the signal may be sent for a short time when necessary, so that selection of a relay station can be maintained by sending the call-end signal for a short time at the end of a call.

As described above, according to the present invention, among the plurality of relay stations,
Only one relay station performs transmission, and interference caused by multiple waves can be completely eliminated.

[Brief explanation of the drawing]

Figure 1 is a relay conceptual diagram showing the general concept of the wireless relay system.
Figure 2 is a conceptual diagram of relaying when multiple relay stations are arranged radially, Figure 3 is a conceptual diagram of relaying when multiple relay stations are arranged in series, and Figure 4 is a wireless relay according to an embodiment of the present invention. FIG. 2 is a configuration diagram showing the configuration of the device. In the figure, (1) is a transmitting station, (2m) and (2b) are relay stations, (
3) is the receiving station, lls is the recording I1. (lni) (14b
This is a 猿 selection signal generator, (21m) (21bm selection signal receiver). In the figures, the same reference numerals indicate the same or corresponding parts. Agent Makoto Kuzuno - Figure 1 Figure 2 b Figure 3

Claims (1)

[Claims] Means for wirelessly transmitting to a plurality of relay stations using radio waves of the same carrier frequency, adding a relay station selection signal to the transmission radio waves to the relay station, and making the final selection based on this selection signal; and has means for storing the transmitted content,
A wireless relay system characterized in that each time transmission to one relay station is completed, the selection signal is switched and sent to select the relay stations in sequence, and the stored transmission content is reproduced and transmitted.