JP2001326579A - Transmission equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide transmission equipment in which switching can be made without hit in the fault of a transmitter and is suited to sharing among plural programs in particular while conventional transmission equipment has a problem of generating hit when switching to a reserve transmitter when an active transmitter is broken. SOLUTION: When a No.1 transmitter 1 and a No.2 transmitter 2 are normal, transmission output is composed and outputted by a composing device 14 via a distributor 6 and a switch circuit 10 and via a distributor 7 and a switch circuit 11. When the No.1 transmitter 1 is broken, the transmission output of the No.2 transmitter 2 is composed and outputted by the composing device 14 via a distributor 7 and switch circuits 9 and 10 and via the distributor 7 and the switch circuit 11. When the No.2 transmitter 2 is broken, the transmission output of the No.1 transmitter 1 is composed and outputted by the composing device 14 via the distributor 6 and a switch circuit 101 and via the distributor 6, switch circuits 8 and 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmission apparatus for transmitting a program photographed in a studio or the like to a master station broadcasting station, and particularly to a transmission apparatus which does not cause an instantaneous interruption when a failure occurs in a part of the transmitter. Related to the device.

[0002]

2. Description of the Related Art A conventional television broadcasting system for transmitting broadcast waves from a studio to a TV receiver via a master station broadcasting station and a relay broadcasting station will be described with reference to FIG. FIG.
1 is a schematic configuration diagram of a television broadcasting system. The broadcast system shown in FIG. 3 basically includes a studio device 20 in a studio, a master station device 30 in a master station, a relay device 40 in a relay station, and a TV receiver 50.

[0003] The studio device 20 has a program (P1)
To QAM (Quadrature Amplitude Modulation) or QPSK (Quadrature Phase Shift Keying:
OFDM (Orthogonal Frequency Division) that can handle thousands of carriers modulated by quadrature phase modulation
Multiplex: Orthogonal frequency multiplexing modulation (OFDM MOD) 21 and P1 TS (Transpor
The first STL (Studio to Transmitter Link) transmitter (ST
L TX) 22 and an OFDM-modulated IF (Intermed
a second STL transmitter (STLTX) 23 for wirelessly transmitting an iate Frequency (intermediate frequency) signal by microwave;
A combiner 24 combines the transmission outputs of the STL TXs 22 and 23 and outputs the combined output from the antenna as an SHF (Super High Frequency) link.

[0004] The master station device 30 distributes an SHF link signal from the studio device 20 into a TS signal and an IF signal, and a first S that receives the distributed TS signal.
A TL receiver (STL RX) 32 and a second STL receiver (STL RX) 33 for receiving the distributed IF signal
And an OFDM modulator (OFDM MOD) 34 for OFDM modulating the received TS signal, and a switch circuit (SW) for selectively outputting an input from the OFDM modulator 34 and an input from the second STL receiver 33. 35 and SW3
5 is used as an SHF link for TTL (Transm
It is composed of a TTL transmitter (TTL TX) 36 for transmitting an itter to Transmitter Link, and a transmitter (TX) 37 for transmitting an input signal from the SW 35 as a broadcast wave Fp.

[0005] The relay device 40 receives the SH from the master station device 30.
TTL receiver (TTL
RX) 41, a simple broadcast wave receiver 42 for receiving the broadcast wave Fp from the transmitter 37 of the master station device 30, and an input from the TTL receiver 41 and an input from the simple broadcast wave receiver 42 selectively. A switch circuit (SW) 43 for outputting, and SW4
A TTL transmitter (TTLTX) 45 for TTL transmission of the input signal from the S3 as an SHF link, and a transmitter (TX) 46 for transmission of the input signal from the SW 43 as a broadcast wave Fp.
It is composed of

[0006] The TV receiver 50 receives the broadcast wave Fp transmitted from the transmitter (TX) 37 of the master station device 30 or the relay device 4.
The broadcast wave Fp transmitted from the transmitter (TX) 46 of No. 0 is received, and the program (program) is broadcast to the picture tube.

Next, a conventional transmitting apparatus in a studio apparatus for transmitting a program from a studio to a master station broadcasting station will be described with reference to FIG. FIG. 4 is a configuration block diagram of a conventional transmission device. The conventional transmission device shown in FIG. 4 is used as the first STL transmitter 22 or the second STL transmitter 23 of the studio device 20 in FIG. 3, and includes a first transmitter (No. 1 transmitter). ) 1 and the second transmitter (No.
2) It is composed of 2, a switch circuit 3, a control circuit (1) 4, and an output antenna 5.

In the relationship between FIG. 3 and FIG. 4, the first and second STL transmitters 22 and 23 have No. 1 transmitter 1, No. 1 2 includes a transmitter 2, a switch circuit 3, and a control circuit 4. The output from the switch circuit 3 transmits a signal of the SHF link from the antenna (the output antenna 5 of FIG. 4) via the combiner 24 of FIG. Is done.

[0009] Each part of the conventional transmitting apparatus will be described in detail. No. The one transmitter 1 is an active transmitter, and receives a program (program) P1 as an input signal, and performs a transmission operation at a predetermined output in order to transmit the signal from the output antenna 5. In FIG. 4, the transmitter performs STL transmission.
No. 2 transmitter 2 is a spare transmitter, and the basic operation is No. 2. Same as 1 transmitter 1.

The switch circuit (1) [SW (1)] 3
Normally, No. The output signal of the transmitter 1 is selected and output. When the transmitter 1 fails, the spare No. 1 2 is a circuit for selecting an output signal from the transmitter 2. The control circuit (1) 4 No. 1 transmitter 1 and No. 1
No. 2 transmitter 2 is constantly monitored. 1 When an abnormality occurs in the transmitter 1 (when a failure occurs), the switch circuit 3 is set to N
o. 2 A switching control signal is output so as to select the output of the transmitter 2. The output antenna 5 transmits a signal output from the switch circuit 3 via the SHF link.

As described above, the transmitting apparatus is provided with a working transmitter and a backup transmitter so that when a failure occurs, the switching is performed so that the service is not cut off. The purpose of the STL transmitter for transmitting to a station is to prevent the radio wave from being interrupted for a long time due to the failure of the device because it is close to public facilities.

The operation of FIG. 4 will be described. In a normal state, the switch circuit 3 One transmitter 1 selects a signal subjected to transmission processing and sends it to the output antenna 5.
Then, the control circuit 4 sets the No. No. 1 transmitter 1 and No. 1 No. 2 transmitter 2 is constantly monitored. 1 When an abnormality of the transmitter 1 is detected, a switch control signal is output to the switch circuit 3 to switch the switch. Then, the switch circuit 3
Performs switching of the relay according to the switching control signal from the control circuit 4, and (2) A signal subjected to transmission processing by the transmitter 2 is selected, and the signal is transmitted to the output antenna 5. Thus, the current No. When the transmitter 1 fails, the spare No. 1 2 is to switch to the transmitter 2.

As a well-known document for switching to a spare unit in the case of a failure of a communication device, there is a document of 1998 (1998).
Japanese Patent Laid-Open Publication No. Hei 10-290206, "Switching mask circuit for multiplex radio apparatus and multiplex communication system using the same" (Applicant: Fukushima NEC Corporation; In this multiplex communication system, at the time of transmission switching, the switching information is multiplexed and transmitted, and the reception unit masks the reception switching with the demultiplexed transmission switching information for a certain period of time, so that the radio line stop time in the event of a failure in the reception unit Is to minimize.

[0014]

However, in the above-mentioned conventional transmitting apparatus, the currently used No. 1 from the transmitter 1 to the spare No. 2. Since the switching operation to the transmitter 2 uses the switch (relay) in the switch circuit 3, there is a problem that the switching is always instantaneously interrupted at the time of switching.

[0015] The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a transmission device which can be switched without an instantaneous interruption when a transmitter fails, and which is particularly suitable for a transmission device sharing a plurality of programs. And

[0016]

SUMMARY OF THE INVENTION The present invention for solving the above-mentioned problems of the prior art is characterized in that the control means performs the first transmission if the first transmission means and the second transmission means are normal. Controlling the selecting means to select and combine the signal output and distributed from the means and the signal output and distributed from the second transmitting means, and the second transmitting means if the first transmitting means fails. The selection means is controlled so as to select the signal output from the transmission means and distributed to the two systems and combine them again. If the second transmission means fails, the selection means outputs the signals from the first transmission means. The transmission device controls the selection means so as to select and distribute the signals distributed to the transmission means. Since a normal transmission signal is always output from the selection means, there is no instantaneous interruption when the transmission means fails, The reliability of the device can be improved.

Further, the present invention provides the above-mentioned transmitting apparatus,
It is preferable that the signal input to the transmitting means is shared by a plurality of programs as a plurality of program signals, and the transmitting means is an STL transmitter.

[0018]

Embodiments of the present invention will be described with reference to the drawings. Note that the function realizing means described below may be any circuit or device as long as the function can be realized, and some or all of the functions may be realized by software. is there. Further, the function realizing means may be realized by a plurality of circuits, or the plurality of function realizing means may be realized by a single circuit.

[0019] A transmitting apparatus according to the present invention includes a first transmitting means for receiving a plurality of programs and performing a transmitting process, a second transmitting means for similarly transmitting a plurality of programs, and a first transmitting means. Means and a selecting means for selecting a signal output from the second transmitting means, and a control means for monitoring states of the first and second transmitting means and controlling the selecting means according to these states.

Here, the selecting means distributes the outputs from the first and second transmitting means to two systems, respectively, and if both the first and second transmitting means are normal, the selecting means distributes the outputs from both the distributed systems. Are combined and output. If one of the transmitting means fails, the signal distributed from the other transmitting means which has not failed is combined and output again.

Next, a transmitting apparatus according to an embodiment of the present invention will be described with reference to FIG. FIG. 1 is a block diagram illustrating a configuration of a transmitting apparatus according to an embodiment of the present invention. As shown in FIG. 1, a transmitting device (present transmitting device) according to an embodiment of the present invention includes a first transmitter (No. 1 transmitter) 1 and a second transmitter (No. 2 transmitter). 2) and the signal selection circuit 16
, A control circuit (2) 15 and an output antenna 5.

The signal selection circuit 16 includes a distributor (1)
6, a distributor (2) 7, and a switch circuit (2) [SW
(2)] 8 and the switch circuit (3) [SW (3)] 9
, A switch circuit (4) [SW (4)] 10, a switch circuit (5) [SW (5)] 11, and terminations 12 and 13.
And a synthesizer (H) 14.

Next, each section of the transmitting apparatus will be specifically described. No. The one transmitter 1 is an active transmitter, receives a plurality of programs (programs) P2 and P3 as input signals, and performs a transmitting operation at a predetermined output in order to transmit the signals from the output antenna 5. Specifically, a transmitter that performs STL transmission is conceivable. No. 2 transmitter 2 is a spare transmitter, and the basic operation is No. 2. Same as 1 transmitter 1.

However, in the transmission apparatus, No. 1 transmitter 1 and No. 1 The two transmitters 2 are different from the conventional relationship between the two transmitters shown in FIG. 4 in that one is the main and the other is not the subordinate, but both transmitters operate simultaneously and if one fails, the other Are complementary. Therefore, in this transmitting apparatus, even if any of the transmitters fails, it is possible to continue transmitting a normal signal without an instantaneous interruption. In addition, No. No. 1 transmitter 1 and No. 1 The two transmitters 2 correspond to the first transmitting means and the second transmitting means in the claims.

The components of the signal selection circuit 16 will be described. still,
The signal selecting circuit 16 corresponds to a selecting means of the present invention, and the distributor (1) 6 is used as a first distributor of the present invention.
Has a switch circuit [SW
(2)] 8 is a first switch circuit, a switch circuit [SW (3)] 9 is a second switch circuit, and a switch circuit [SW (4)] 10 is a second switch circuit. In the third switch circuit, the switch circuit [SW (5)] 11 is in the fourth switch circuit, the terminations 12 and 13 are in the first and second terminations, and the combiner (H) 14 is in the claims. Term is equivalent to the synthesizer.

The distributor (1) [H] 6 has the No. 1 The signals processed by the transmitter 1 are transmitted to SW (2) 8 and SW (4) 1.
Distribute to 0. The distributor (2) [H] 7 is No. 2 The signals transmitted by the transmitter 2 are converted to SW (3) 9 and SW (5).
Distribute to 11.

The switch circuit [SW (2)] 8 selects, based on the switching control signal from the control circuit (2) 15, the terminal 12 or the SW (5) 11 to output the input signal from the distributor 6. I do. Specifically, No. 1 transmitter 1 and N
o. If both the transmitters 2 are normal, the SW (2) 8 is connected to the terminal 12, and 2 When transmitter 2 fails, SW
(2) 8 is connected to SW (5) 11. The switch circuit [SW (3)] 9 terminates the input signal from the distributor 7 with the switching control signal from the control circuit (2) 15 at the terminal 13 or S
Which of W (4) 10 to output is selected. Specifically, No. No. 1 transmitter 1 and No. 1 If both transmitters 2 are normal, SW (3) 9 is connected to terminal 13 and If one transmitter 1 fails, SW (3) 9 connects to SW (4) 10.

The switch circuit [SW (4)] 10 selects either the input signal from the distributor 6 or the input signal from the SW (3) 9 according to the switching control signal from the control circuit (2) 15, and sends it to the synthesizer 14. Output. Specifically, SW (4) 10
o. When the transmitter 1 is normal, the input signal from the distributor 6 is selected. If one transmitter 1 fails, the input signal from SW (3) 9 is selected. Switch circuit [SW (5)]
The selector 11 selects either the input signal from the distributor 7 or the input signal from the SW (2) 8 according to the switching control signal from the control circuit (2) 15, and outputs the selected signal to the synthesizer 14. Specifically, SW
(5) No. 11 is No. 2 When the transmitter 2 is normal, the distributor 7
Select the input signal from 2 When the transmitter 2 fails, the input signal from the SW (2) 8 is selected.

The terminating end 12 is an end for stopping the input signal from the SW (2) 8 from being transmitted. Termination 13 is SW
(3) This is an end that stops the input signal from 9 without transmitting it. The combiner (H) 14 combines the input signal from the SW (4) 10 and the input signal from the SW (5) 11 and transmits the combined signal to the output antenna 5.

The control circuit (2) 15 1 transmitter 1
And No. 2 The state of the transmitter 2 is constantly monitored, and SW (2) 8, SW (3) 9, SW
(4) Control the state of 10 and SW (5) 11. A specific control state of the switch circuit will be described with reference to the following [Table 1]. Table 1 is a table showing an operation state of the switch circuit.

In the normal state (No. 1 transmitter 1 and No. 1 transmitter).
SW (2) 8
Connects the distributor 6 to the terminal 12, SW (3) 9 connects the distributor 7 to the terminal 13, SW (4) 10 connects the distributor 6 to the synthesizer 14, and SW (5) 11 The distributor 7 is connected to the synthesizer 14. In Table 1, "-" indicates that the connection is in the normal state and remains unchanged, and "o" indicates that the connection is in the opposite state to the connection in the normal state. That is, “○” means that the state of the switch in the normal state switches.

[0032]

[Table 1]

No. If one transmitter 1 fails (NG),
SW (3) 9 and SW (4) 10 are switched. That is, the SW (3) 9 receives the input signal (No. 2) from the distributor 7
The transmission output signal of the transmitter 2) to the SW (4) 10;
SW (4) 10 outputs the input signal from SW (3) 9 to combiner 14.

Then, on the other hand, the No. 1 signal is sent to the synthesizer 14 via the distributor 7 and the SW (5) 11. 2 Since the transmission output signal from the transmitter 2 is input, the combiner 14
(4) No. 10 from both SW and (5) 11. 2 A transmission output signal from the transmitter 2 is input, synthesized, and output to the output antenna 5.

In addition, No. 2 When the transmitter 2 fails (NG), SW (2) 8 and SW (5) 11 are switched.
That is, SW (2) 8 receives the input signal (N
o. The output signal (the transmission output signal of one transmitter 1) is output to the SW (5) 11, and the SW (5) 11 outputs the input signal from the SW (2) 8 to the combiner 14.

Then, on the other hand, the No. 1 signal is sent to the synthesizer 14 via the distributor 6 and the SW (4) 10. Since the transmission output signal from the transmitter 1 is input, the combiner 14
(4) No. 10 from both SW and (5) 11. A transmission output signal from one transmitter 1 is input, synthesized, and output to the output antenna 5.

Explaining mainly the signal flow, N
o. No. 1 transmitter 1 and No. 1 If both transmitters 2 are in the normal state, 1 A transmission output signal from the transmitter 1 is input to the synthesizer 14 via the distributor 6 and the SW (4) 10,
No. 2 The transmission output signal from the transmitter 2
It is input to the synthesizer 14 via W (5) 11. Therefore, the output from the combiner 14 is the No. input through the SW (4) 10. Transmission output signal of one transmitter 1 and SW
(5) No. input through 11 The transmission output signals of the two transmitters 2 are combined.

No. No. 1 transmitter 1 is normal and no. No. 2 when the transmitter 2 is in a failure state. The transmission output signal from the transmitter 1 is input to the synthesizer 14 via the distributor 6 and the SW (4) 10, and The transmission output signal from the transmitter 2 is disconnected at SW (3) 9 and SW (5) 11 and is not output to the synthesizer 14; The transmission output signal of one transmitter 1 is input to the combiner 14 via the distributor 6, SW (2) 8, and SW (5) 11. Therefore, the output from the combiner 14 is the No. input through the SW (4) 10.
1 and the transmission output signal of the transmitter 1 and the No. 1 input through the SW (5) 11. The transmission output signal of one transmitter 1 is synthesized.

No. No. 1 when the transmitter 1 is out of order. 2
If the transmitter 2 is normal, The transmission output signal from the second transmitter 2 is input to the combiner 14 via the distributor 7 and the SW (5) 11, The transmission output signal from the transmitter 1 is cut off by the SW (2) 8 and the SW (4) 10 and is not output to the synthesizer 14; The transmission output signal of the two transmitter 2 is input to the combiner 14 via the distributor 7, SW (3) 9, and SW (4) 10. Therefore, the output from the combiner 14 is the No. input through the SW (4) 10.
2 and the transmission output signal of No. 2 input via SW (5) 11. The transmission output signals of the two transmitters 2 are combined.

According to the present transmission device, 1 transmitter 1 or No. 1 2 If any one of the transmitters 2 fails, the combiner 1
4, a normal transmission output signal is always input and the output antenna 5 outputs the signal.
o. 1 transmitter 1 or No. 1 Even if a failure occurs in any of the two transmitters 2, the transmission signal will not be momentarily interrupted. Therefore,
The transmission device is not affected by the occurrence of a failure in one of the transmitters.

Next, a case where the present transmitting apparatus is applied to a television broadcasting system for transmitting broadcast waves from a studio to a TV receiver via a master station broadcasting station and a relay broadcasting station will be described with reference to FIG. FIG. 2 is a schematic configuration diagram of the television broadcasting system according to the embodiment of the present invention. still,
The system shown in FIG. 2 is a system for transmitting a plurality of programs from a studio.

The system shown in FIG. 2 includes a studio device 20 'in a studio and a master station device 3 in a master station broadcasting station.
0 ', a relay device 40' at a relay station, and a TV receiver (not shown).

The studio apparatus 20 'converts a plurality of programs (P2, P3) into QAM (Quadrature Amplitude Modul).
ation: Quadrature amplitude modulation or QPSK (Quadrature Phase)
Shift Keying (Orthogonal Frequency Divis) OFDM (Multiple Modulation Orthogonal Frequency Divis)
OFDM modulators (OFDM MODs) 21a and 21b for performing ion multiplexing (orthogonal frequency multiplexing modulation) and OFD
A first STL (Studioto Transformer) for wirelessly transmitting signals modulated by the M modulators 21a and 21b by microwaves.
mitter Link) Transmitter (STL TX) 22 'and OF
A second STL transmitter (STL transmitter) that wirelessly transmits the signals modulated by the DM modulators 21a and 21b using microwaves.
TX) 23 'and STL TX 22', 23 'are combined to transmit SHF (Superhigh Frequent
(ncy: ultra-high frequency) link.

When the configuration of the transmitting apparatus of FIG. 1 is applied to the studio apparatus 20 'of FIG. 2, the correspondence is STL TX2
2 ′ is No. STL TX23 'corresponds to one transmitter 1.
Is No. 2 corresponds to the transmitter 2, and the combiner 24 'corresponds to the signal selection circuit 16 and the control circuit 15. The control circuit 15 is provided separately and independently from the synthesizer 24 ', and the STL
The TX 22 'and 23' may be monitored and the signal selection circuit 16 in the combiner 24 'may be controlled.

The master station device 30 'is connected to the studio device 2
Distributor 31 'for distributing the signal of the SHF link from 0'
And a first STL receiver (ST
LRX) 32 and a second STL for receiving the distributed signal.
Receiver (STL RX) 33 and first STL receiver 3
A switch circuit (SW) 35 for selectively outputting an input from the second STL receiver 33 and an input from the second STL receiver 33;
TTL (Transmit)
ter to Transmitter Link) TTL transmitter (T
TL TX) 36 and transmitters (TX) 37a and 37b for transmitting an input signal from the SW 35 as a broadcast wave Fp.

The relay device 40 'receives the S from the master station device 30.
A TTL receiver (TT) that receives TTL signals of the HF link
L RX) 41, simple receivers 42a and 42b for receiving the broadcast wave Fp from the transmitter 37 of the master station device 30, and TT
A switch circuit (SW) 43 for selectively outputting an input from the L receiver 41 and an input from the simple receivers 42a and 42b.
And the input signal from the SW 43 as the SHF link and the TT
L TTL transmitter (TTL TX) 45 and SW
A transmitter (TX) 46a for transmitting an input signal from
46b.

If the transmitting apparatus is applied to a studio apparatus of a television broadcasting system for broadcasting a plurality of programs, a failure occurs in either the first STL transmitter 22 'or the second STL transmitter 23'. Also, since the synthesizer 24 'outputs the transmission output signal of the normal transmitter without instantaneous interruption, the reliability of the STL transmission in the studio device 20' having high publicity can be improved.

Although the present transmission apparatus can be applied to a studio apparatus for transmitting a single program by STL, it is particularly effective to apply the present apparatus to a studio apparatus for transmitting a plurality of programs by STL. In other words, the STL that transmits a single program
When this transmitting apparatus is applied to a transmitter, at least No. 1 transmitter 1 and No. 1 No. 2 transmitters 2 are required. No. 1 transmitter 1 and No. 1 Two transmitters 2 will suffice, and the studio device 20 '
There is an effect that the configuration can be made simple and inexpensive.

According to the transmitting apparatus according to the embodiment of the present invention, since the signal selecting circuit 16 is controlled by the control circuit 15 to always output the transmission output signal from the output antenna 5 finally, Instantaneous interruption to failure can be achieved,
Further, since a relay is used as a switch circuit in the signal selection circuit 16, there is an effect that the configuration can be made simple and inexpensive.

[0050]

According to the present invention, when the first transmitting means and the second transmitting means are normal, the control means determines whether the signal output from the first transmitting means and the distributed signal are transmitted to the second transmitting means. The selection means is controlled so as to select and combine the signal output and distributed from the transmission means, and when the first transmission means fails, the signal is output from the second transmission means and distributed to two systems. The selection means is controlled so as to select and re-synthesize the signal. If the second transmission means fails, the signal output from the first transmission means and distributed to the two systems is selected and re-synthesized. Since the transmission device controls the selection means, a normal transmission signal is always output from the selection means,
There is an effect that the reliability of the device can be improved without being instantaneously interrupted when the transmission means fails.

[Brief description of the drawings]

FIG. 1 is a configuration block diagram of a transmission device according to an embodiment of the present invention.

FIG. 2 is a schematic configuration diagram of a television broadcasting system according to the embodiment of the present invention.

FIG. 3 is a schematic configuration diagram of a television broadcasting system.

FIG. 4 is a configuration block diagram of a conventional transmission device.

[Explanation of symbols]

1 ... No. 1 transmitter, 2 ... No. 2 transmitter, 3 switch circuit (1) [SW (1)], 4 control circuit (1), 5 output antenna, 6 distributor (1),
7: distributor (2), 8: switch circuit (2) [SW
(2)], 9 ... Switch circuit (3) [SW (3)],
10: switch circuit (4) [SW (4)], 11: switch circuit (5) [SW (5)], 12: terminator
Reference numeral 13: terminator, 14: synthesizer, 15: control circuit (2), 16: signal selection circuit, 20, 20 ': studio equipment, 30, 30': master station equipment, 40, 40 '
... Relay device, 50 ... TV receiver

Continuing on the front page (72) Inventor Minoru Hisamatsu 3-14-20 Higashinakano, Nakano-ku, Tokyo Inside Kokusai Denki Co., Ltd. (72) Inventor Masaru Suzuki 3-14-20 Higashinakano, Nakano-ku, Tokyo Kokusai Electric Co., Ltd. (72) Inventor Shigeru Kawamura 3-14-20 Higashinakano, Nakano-ku, Tokyo Kokusai Denki Co., Ltd. Seiichiro Ito 3-14-20 Higashinakano, Nakano-ku, Tokyo Kokusai Electric Co., Ltd. (72) Inventor Hayato Nishida 2-2-1 Jinnan, Shibuya-ku, Tokyo Japan Broadcasting Corporation Broadcasting Center (72) Inventor Ichikawa Kazuyoshi 2-2-1 Jinnan, Shibuya-ku, Tokyo Japan Broadcasting Corporation Broadcasting Center (72) Inventor Toru Abe 2-2-1 Jinnan, Shibuya-ku, Tokyo Japan Broadcasting Corporation Broadcasting Center F-term (reference) 5C025 AA02 AA03 AA06 AA07 AA08 AA09 AA10 5K060 CC04 CC11 CC17 DD03 EE05 FF06 HH39

Claims (4)

[Claims] A first transmitting means for performing a transmitting process and a second transmitting means;
Transmission means, a selection means for selecting a signal from the transmission means, and a control means for monitoring the first and second transmission means and controlling the selection means according to a state of the transmission means. Selecting means for distributing the signals from the first and second transmitting means to each of two systems, selecting two signals from the distributed signals, and synthesizing and outputting the signals; The control means, if the first transmission means and the second transmission means are normal, the signal output and distributed from the first transmission means and the second transmission means The selection means is controlled so as to select and combine the output and distributed signals, and when the first transmission means fails, the signals are output from the second transmission means and distributed to two systems. Controlling the selection means to select a signal and re-synthesize,
If the second transmission means fails, the selection means is controlled so as to select a signal output from the first transmission means and distributed to the two systems and re-synthesize the signals. A transmission device, which is control means for realizing the transmission device. 2. A first transmitter to which a program signal is inputted and which performs transmission processing, and wherein the program signal is inputted and
A second transmitter that performs transmission processing and a first transmitter that terminates a signal
And a second terminal, a first distributor for distributing the signal from the first transmitter to two systems, and a second distributor for distributing the signal from the second transmitter to two systems. , A synthesizer for inputting and synthesizing two systems of signals among the distributed signals, and a first and a first unit for performing a switching operation by a switching control signal.
A switching circuit that outputs a switching control signal to each of the switch circuits; wherein the first switch circuit receives a signal input from the first distributor. The second switch circuit outputs a signal input from the second distributor to the first terminal or the fourth switch circuit, and outputs the signal input from the second distributor to the second terminal or the third switch circuit. And the third switch circuit selects a signal input from either the first distributor or the second switch circuit and outputs the selected signal to the synthesizer, and the fourth switch circuit Is a switch circuit that selects a signal input from either the second distributor or the first switch circuit and outputs the signal to the combiner. The control circuit includes the first transmitter and the first transmitter. If the second transmitter is normal, A switch control signal is output from the first switch circuit so that a signal is output to the first terminal, and a signal is output from the second switch circuit to the second terminal. The third switch circuit Is a control circuit that outputs a switching control signal such that an output signal is input from the first distributor and the fourth switch circuit outputs an output signal from the second distributor. When the first transmitter fails, the first switch circuit is switched so that a signal is output to the first terminal and the second switch circuit is switched so that a signal is output to the third switch circuit. A control signal is output, and the third switch circuit is controlled so that an output signal is input from the second switch circuit and a fourth switch circuit is output so that an output signal is input from the second distributor. Signal When the second transmitter fails, the control circuit outputs a signal to the first switch circuit to the fourth switch circuit, and outputs a signal to the second switch circuit. Outputting a switching control signal so as to be output to the second terminal,
The third switch circuit is a control circuit that outputs a switching control signal so that an output signal is input from the first distributor and the fourth switch circuit is an output signal that is input from the first switch circuit. A transmitting device, characterized in that: 3. The transmitter according to claim 1, wherein said first and second transmitting means or said first and second transmitters are STL transmitters for transmitting a studio transmitter link. Transmission device. 4. The system according to claim 1, wherein a plurality of program signals are input to said first and second transmission means or said first and second transmitters, and a plurality of programs are shared. 3. The transmitting device according to 3.