JPS6062740A - Split broadcast system - Google Patents

Abstract

PURPOSE:To eliminate mutual interference by broadcasting sequentially a signal from plural speakers in the multiple address broadcast system where the plural speakers of a slave station are arranged while keeping an equal angle in all directions on one plane. CONSTITUTION:A master station transmits signals in the order of a common signal fG for 2T sec, a simultaneous signal fA for T sec, broadcast information f0, a signal fA for 3T sec, broadcast information, the signal fA for 3T sec, broadcast information, the signal fA for 3T sec.... A slave station discriminates the split broadcast that the signal fG is consecutive for 2T sec. The 1st gate circuit 28 is opened by receiving the signal fA for T sec succeedingly to broadcast the signal f) from a speaker 11 and receive the signal fA for 3T sec, then it is discriminated as the end of call so as to close the gate circuit 28 and also open the next gate circuit 29. Every time the signal fA for 3T sec is received, the speaker to broadcast the signal f0 is switched similarly.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a divided broadcast system in a broadcast radio system.

(Prior Art) A slave station in a broadcast radio system is generally installed outdoors, and the information sent from the master station is amplified by a speaker amplifier and broadcast from an outdoor speaker.

Figure 1 shows the broadcasting service area 110 centered around each subsidiary station.
, 120, 130, 140, 150. In FIG. 1, 310, 320° 410.420.
51o is a slave station, 210,220°230.240,2
50 and 260 are acoustic interference areas. In Figure 1, when broadcasting from each slave station 310.320°410.420,510 at the same time, the diagonally shaded area 210,220
, 230, 240°, 250, and 280, the broadcasts from the two slave stations interfere with each other, making it difficult to hear the broadcasts. In order to solve the above problem, it is necessary to broadcast the same broadcast content from the slave station 3101320 the first time, and to broadcast it from the slave stations 410 and 410 the second time.
A conceivable method is a stone-divided broadcast in which the third broadcast is made from the slave station 510.

FIG. 2 shows a conventional calling method for divided broadcasting. FIG. 2(a) shows an individual calling method, and FIG. 2(b) shows a calling method for divided broadcasting. FIG. 2(b) shows nine methods constructed by combining the individual calling methods shown in FIG. 2(a). FIG. 2(a) shows a case where the first slave station and the second slave station are called. In order to call the first slave station, the common signal fG is sent for one second and the individual signal fxl*f y IL
are sent for 1 second each, and then the common signal fG is sent for 1 second and individual signals fXt, fy to call the second slave station.
h for 1 second each, and then broadcast f,
, and finally sends out a call end signal fA for 3T seconds to end the call. Figure 2(b) shows the conventional divided broadcasting signal system, in which all slave stations are divided into three groups, and the L
In order to call a group, the individual calling signals shown in FIG. 2(a) above are combined and transmitted, and then the broadcast fo
, and then sends out a call end signal fA. The second time, the M group is called in the same way as the L group, and the third time, the N group is called in the same way as the L group. According to the above, if the number of slave stations in each group is n, the time it takes to call each group and start broadcasting is (3'p
The disadvantage is that it takes a long time of xn ) seconds. The number of combinations of individual signals is generally a maximum of 100, and depending on the system configuration, the number of slave stations may exceed 100. In this case, due to acoustic interference, split broadcasting may be configured. The drawback was that it could not be done.

(Object of the Invention) An object of the present invention is to transmit a broadcast signal from a master station that includes a verification frequency signal f(1) for designating a specific slave station and a speaker verification frequency signal fA for designating a specific speaker. In the divided broadcast system, a slave station includes an fG detection circuit, a 10-hour detection circuit, a 1-division broadcast judgment circuit, an fA detection circuit, and an fA time detection circuit.

It is equipped with an fA counter, a call detection circuit, and a necessary speaker drive means, and maintains an equal angle so that the slave station can amplify information from the master station equally in all directions on one plane. In order to eliminate interference between signals by sequentially and time-sharingly providing audio input to the multiple speakers, the corresponding slave station is called at any time using the matching frequency signal fG. Later, a speaker matching frequency signal fA for specifying one of the plurality of speakers is generated.
and the corresponding broadcast, and sequentially scan multiple speakers in a predetermined time width using the reference frequency signal fA, thereby eliminating the shortcomings of the conventional technology and transmitting signals from multiple speakers. An object of the present invention is to provide a divided broadcasting system configured to be able to eliminate mutual interference between audio outputs.

(Structure of the Invention) The present invention consists of a master station and a plurality of slave stations, a slave station reference frequency signal fG for designating a particular slave station from among the plurality of slave stations, and This is an improvement of the divided broadcast system in which a broadcast signal including a speaker matching frequency fA for designating a specific speaker is sent from a master station.

In the present invention, each of the plurality of slave stations is provided with a detection unit for detecting the slave station verification frequency signal fG and the speaker verification frequency signal fA to designate a particular slave station and a particular speaker. There is. The detection section includes an fG detection circuit, an f(1 hour detection circuit, and an fA detection circuit).

It consists of an fA time detection circuit, an fA counter, a 1-division broadcast judgment circuit, a call detection circuit, and a speaker driving means. The fG detection circuit is for detecting the presence of the slave station reference frequency signal fG.

The 10-hour detection circuit is for detecting that the output of the fG detection circuit continues for a first fixed period. The fA detection circuit is for detecting the presence of the speaker reference frequency signal fA. The f input time detection circuit is f
This is for detecting that the output of the person detection circuit continues for a second fixed period. The fA counter is f
This is for counting the number of times the speaker verification frequency signal f outputted from the time detection circuit A is outputted. The divided broadcast judgment circuit is for determining whether it is a divided broadcast based on the output of the 10-hour detection circuit and the output of the counter.

The call detection circuit is for giving a call signal to a specific speaker from among a plurality of speakers by the output of the 10 hour detection circuit, the f-in time detection circuit, and the fA kakunta. The speaker driving means is for giving a broadcast signal to a specific speaker according to the output of the call detection circuit and the output of the counter, and amplifying the included information.

In addition to the above configuration, information from the master station can be amplified evenly in all directions on one plane on the side of the counting slave stations. Once a specific slave station has been called using the reference frequency fG, in order to eliminate interference between signals by distributing power to multiple speakers and sequentially time-sharing audio input to multiple speakers,
A plurality of speakers are sequentially scanned one by one at every second fixed period.

(Example) Next, the present invention will be explained in detail with reference to the drawings.

FIG. 3 is a plan view showing the arrangement of one outdoor receiver used as a slave station. 3 speakers 11-13 on pillar A
be installed so that the sound can be amplified evenly in all directions. The speaker 11 has fan-shaped areas A and B.

C is the service area 14, and the speaker 12 has fan-shaped areas A, C, and D as the service area 15, and the speaker 13
The fan-shaped areas A, D, and B are the service area 16. The first broadcast is performed by driving the speaker 11 and covers the service area 14. Second
The second broadcast is performed by driving the speaker 12 and covers the service area 15. The third broadcast is performed by driving the speaker 13 and covers the service area 16.

FIG. 4 shows service areas 141-145, 151-155° 161-1 centered around each slave station to which the present invention is applied.
It is possible to show 65. 110~12Q, 13G, 1
40,150. and 31o.

320, 410, 420, 510, etc. have the same meaning as in FIG. In FIG. 4, it is assumed that the speakers of each slave station are installed so that they are all oriented in the same direction in all three directions, and that only the plurality of speakers located in the same direction are driven at the same time. The first broadcast is broadcast in service areas 141-145, the second broadcast is broadcast in service areas 151-155, and the third broadcast is broadcast in service areas 161-165.

With the above steps, multiple speakers installed on pillars can be installed one after another.
By driving it, an acoustic interference paddle system can be constructed.

Figure 5 shows a simultaneous calling signal for all slave stations to operate at the same time.The common signal fG is sent out for 7 seconds, the green signal fA is sent out for T seconds, and then the broadcast fG is sent out for T seconds.
, and finally sends out a call end signal fA for 3T seconds.

FIG. 6 is a diagram showing an embodiment of divided broadcasting constructed based on the method shown in FIG. In FIG. 6, a common signal fG is transmitted from the master station for 2T seconds. Since the signal fG was transmitted for 2T seconds, it is recognized that it is a divided broadcast signal.

Next, - send out a green signal fA for T seconds and broadcast f
o, and then the end signal fA is sent for 3T seconds to end the first broadcast. Subsequently, the broadcast f. is sent out again, and the end of the call signal fA is sent out for 3T seconds to end the second broadcast. After that, the broadcast fo is sent out again, the end of call signal is sent out for 3T seconds, and the third call is sent out.
The first broadcast ends.

By receiving the common signal fG for 2T seconds, the slave station determines that it is a divided broadcast, and when it receives the simultaneous paging signal fA for all slave stations for T seconds, the gate circuit for the first speaker is opened, broadcast f is performed, the end of call signal fA is detected for 3T seconds, and the speaker gate circuit is closed. At the same time, the slave station opens the second speaker gate circuit, performs broadcast f, and then closes the system beaker gate circuit in response to the second end-of-call signal fA. When the second end-of-call signal is received, the gate circuit for the third speaker is opened. After broadcasting f., the slave station closes the speaker gate circuit while receiving the final end-of-call signal fA for 3T seconds.

All the slave stations are equipped with a counter that counts the end-of-call signal fA for three seconds, and control the speakers according to the number of times the end-of-call signal fA arrives. As described above, the ringing time is greatly reduced, and the system remains practical even when the number of slave stations exceeds 100.

FIG. 7 is a block diagram showing one embodiment of the detection section in the slave station. In FIG. 7, 18 is an fG detection circuit;
9 is a 10 hour detection circuit, 20 is a division broadcast judgment circuit, 21
22 is an fA counter circuit, 22 is an fA detection circuit, 23 is an f input time detection circuit, 24 is a call detection circuit, 25 to 2T are logic circuits forming a speaker gate circuit, 28 to 30 are audio control circuits, 11 to 13 are speakers having the same reference numerals as those in FIG.

Next, the operation when the divided broadcast signal shown in FIG. 6 is input to the detection section shown in FIG. 7 will be described. The common signal fG is f
It is detected by the G detection circuit 18, and the 10 hour detection circuit 19
It is detected that the time is 2T seconds.

The divided broadcast determination circuit 20 determines that the common signal fG of J) 2T seconds has been input, and the fm counter 21 starts operating. When the simultaneous signal f, which is input next to the common signal fG, is sent out for T seconds, this signal is detected by the fA detection circuit 22 and the fA time detection circuit 23. When the call detection circuit 24 determines that the own station has been called based on the outputs of the 10-hour detection circuit 19 and the fA time detection circuit 23, judgment information is output to logic circuits 25-27. Call detection circuit 24 and fA counter circuit 21
Based on the output of
Control 30. The fm counter circuit starts operating according to the output of the divided broadcast determining circuit 20, counts the number of times the end-of-talk signal fm has been sent out within 3T seconds, and outputs an output corresponding to the counted number of times. The fm counter output signal on the signal line 31 is
It is output simultaneously with the output of the divided broadcast determination circuit 20. The fA counter output signal on signal @32 is output in response to the first call termination signal fA. The fA counter output signal on the signal line 33 is output in response to the second call termination signal. In the first broadcast, the logic circuit 25 operates and the speaker 11 is driven. Second
In the second broadcast, the logic circuit 26 operates and the speaker 12
is driven. In the third broadcast, the logic circuit 27 operates and the speaker 13 is driven.

(Effects of the Invention) As explained above, according to the present invention, a plurality of slave stations are arranged at equal angles so that information from a master station can be amplified evenly in all directions on one plane. In order to eliminate interference between signals by sequentially and time-sharingly providing audio input to multiple speakers, - after calling the corresponding slave station using the reference frequency signal fG, The speaker matching signal fA for specifying one of the plurality of speakers and the corresponding broadcast are sent out in combination, and sequentially,
an fG detection circuit for scanning a plurality of speakers in a predetermined time width according to the reference signal f;
A time detection circuit, a two-division broadcast judgment circuit, and an fA detection circuit.

By providing an fA time detection circuit, a +fA counter, a call detection circuit, and necessary speaker driving means,
Reduction of calling time by divided broadcasting (1) achieved, and has the effect of being able to carry out complete divided broadcasting without interference even if the number of slave stations exceeds 100.

[Brief explanation of drawings]

FIG. 1 is a diagram showing a broadcasting service area in a conventional divided broadcasting system. Figure 2 is a diagram showing the calling method in broadcasting by a broadcasting device. sb, Figure 2 (a) is an individual calling method,
b) is a split call method. FIG. 3 is a diagram showing a broadcast service area of a slave station in the divided broadcast system according to the present invention. FIG. 4 is a diagram in which the broadcast service area of the slave station in FIG. 3 is expanded to include a plurality of stations. FIG. 5 is a timing chart of broadcast signals including a call verification signal and a broadcast start signal in the -simultaneous call hojo. FIG. 6 is an expanded version of the broadcast signal shown in FIG. 5, and is a timing diagram showing the broadcast signal used in the present invention. FIG. 7 is a block diagram showing an embodiment of the detection section of the slave station device used in the divided broadcast system according to the present invention. 110.120, 13t), 140,150 ・ -
・ ・ φΦ entertainment/service area 210.220, 230, 240, 250, 260 ・
...-Sound interference areas 310, 320. 410. 420. 510 @
-@@Fist...Child Station 1B--@--fG detection circuit 19φ...@IIfG time detection circuit 20...Divided broadcast judgment circuit 21-...@-fjL counter circuit 22...0. -fA detection circuit 23-@--*fA time detection circuit 24...ψ call detection circuit 25-27...Logic circuit 28-30...Audio control circuit 34--Speaker amplifier 31- 33.--Signal line 3511-11 terminal Patent applicant: NEC Corporation Representative Patent attorney: Hisashi Inoro

Claims (1)

[Scope of Claims] A ninth slave station reference frequency signal f, which is composed of a new station and a plurality of slave stations, and specifies a particular slave station from among the plurality of slave stations.
The broadcasting system is configured such that the master station transmits a broadcasting signal that combines a speaker reference frequency signal fA for specifying a specific speaker from among a plurality of speakers. The slave station reference frequency signal f is provided to each of the slave stations. and a speaker verification frequency signal fJL to designate the specific slave station and the specific speaker, the detection unit detecting the presence of the slave station verification frequency signal fG. fG detection circuit and #
an A-rounded 10-hour detection circuit for detecting that the output of the fG detection circuit continues for a first fixed period; and an fm detection circuit for detecting the presence of the speaker reference frequency fA. an fA time detection circuit for detecting that the output of the fA detection circuit continues for a second fixed period; and an output frequency signal fA output from the fA time detection circuit. an fA counter for counting, and a divided broadcast determination circuit for determining that the broadcast is divided based on the output of the 10-hour detection circuit and the output of the counter. the 10-hour detection circuit and the fA time detection circuit; a call detection circuit for giving a call signal to the specific speaker from among the plurality of speakers by the output of the fA kakunta; and the output of the call detection circuit; speaker driving means for applying the broadcast signal to a #F specific speaker in response to the output of the counter and amplifying the information contained therein; The plurality of speakers are arranged at equal angles so that the information from the master station can be evenly amplified in all directions, and the plurality of speakers are sequentially time-shared. to provide audio input to eliminate interference between signals. The divided broadcasting is characterized in that, once the specific slave station is called using the reference frequency fG, the plurality of speakers are sequentially scanned one by one at each of the second fixed periods. method.