JPH11146358A - Simultaneous broadcasting system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform simultaneous broadcasting with one system of transmission means by separating a first multiplexed signal and a TV signal for digitized analog broadcasting, performing digital transmission with the first multiplexed signal, restoring the TV signal for digitized analog broadcasting to an analog signal and performing analog transmission at a transmission station. SOLUTION: The multiplexed signal to be transmitted with a digital STL 10 is separated into signals for both digital and analog broadcasting, a multiplexed signal equivalent to the multiplexed signal outputted from a multiplexer 8 is transmitted to a transmitter 14 as a signal for digital broadcasting, in addition, an analog TV signal is transmitted as a signal for analog transmission when analog broadcasting of a program from an analog TV studio master 15 is performed, an SD signal for analog broadcasting is transmitted to a D/A converter 12 when analog broadcasting of a program from an SDTV studio master 1-1 is performed respectively, a digital broadcasting signal is transmitted from the digital transmitter 14 and an analog signal is transmitted from an analog transmitter 13 by a multiplex separator 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a simulcast broadcasting system for simultaneously performing analog broadcasting and digital broadcasting in terrestrial broadcasting.

[0002]

2. Description of the Related Art In the field of television broadcasting, there is a transition period from digital broadcasting to equipment for digital broadcasting, from equipment for analog broadcasting to equipment for broadcasting stations for program production by introducing digital technology.

In recent years, in response to the so-called digitalization, high-efficiency coding techniques for transmitting video and audio signals within the bandwidth of existing broadcast channels and high-efficiency coding for effectively using transmission frequencies have been developed. With the development of digital modulation technology and the digitization of broadcast radio waves, research is being carried out toward the realization of complex broadcasting that can coexist with analog broadcasting.

In digital broadcasting, new forms of services such as provision of high-quality images and sounds, various data broadcasting, multimedia and interactive services can be introduced, and the bandwidth for one channel of analog broadcasting (6 MHz for terrestrial broadcasting) ) Enables multi-channel broadcasting such as television broadcasting, audio broadcasting, and data broadcasting.

At this time, the number that can be broadcast simultaneously can be freely adjusted within a range of a bit capacity frame (20 Mbps for terrestrial broadcasting) allocated to one transmission channel. For example, as shown in FIG.
(Standard TV) 51, one system HDTV (High Definition Television) 52, two systems of independent audio 53, and two systems of data programs 54, the following program organization is possible. become. That is, from 9:00 to 10
Until the time, three systems of the standard television 51 are broadcast on channels ch1 to ch3, and one system data program is broadcast on channel ch101. Next, from 10:00 to 11:00, the high-definition television 52 is broadcast on channel ch4, and one system data program 54 is broadcast on channel ch101. From 11:00, two systems of the standard television 51 are broadcast on channels ch1 and ch2, and channel ch1 is broadcast.
The two independent data programs 5 are broadcasted on channels ch101 and ch102.
4 can be broadcast.

By the way, when digital broadcasting is actually introduced, even a receiver who has a television receiver compatible with the current analog broadcasting can receive the digital broadcasting. There is a need to transition to digital broadcasting. For this reason, during this transition period, so-called simulcasting, in which analog broadcasting and digital broadcasting having basically the same program organization are simultaneously broadcast, is planned.

[0007] Here, in the current analog broadcasting system, in order to transmit a program from a studio to a transmitting station, an STL (Studio to Transmit) is used.
erLink), but since the modulation scheme is completely different between analog broadcasting and digital broadcasting, digital broadcasting is required separately from the already installed STL for analog broadcasting in order to carry out the above-mentioned simultaneous broadcasting. A new STL must be installed.

In addition, since the frequency must be changed between the STL for analog broadcasting and the STL for digital broadcasting, when terrestrial digital broadcasting is deployed on a nationwide scale, very large numbers of frequencies are required for simultaneous broadcasting. In some cases, it is expected that STL installation itself becomes impossible due to a shortage of frequency resources.

[0009]

As described above, when simultaneous broadcasting is to be carried out, two STLs must be installed for analog broadcasting and digital broadcasting, and the frequency is controlled by two STLs. Since it has to be changed, there is a problem that a large number of frequencies are required for simultaneous broadcasting. SUMMARY OF THE INVENTION An object of the present invention is to provide a simulcast system that enables this by one system of STL and can simultaneously solve the problem of frequency.

[0010]

In order to solve the above-mentioned problems, the present invention provides a first multiplexing method for multiplexing a digital broadcasting TV signal and another digital broadcasting signal to output a first multiplexed signal. A / D conversion means for converting an analog broadcast TV signal into a digital signal and outputting a digitized analog broadcast TV signal;
Second multiplexing means for multiplexing the V signal and the first multiplexed signal to output a second multiplexed signal; and transmission means for transmitting the second multiplexed signal from the studio to the transmitting station. ,
Separating means for separating the signal transmitted by the transmitting means into a first multiplexed signal and a digitized analog broadcast TV signal, and transmitting the first multiplexed signal separated by the separating means as a digital broadcast signal Digital transmitting means for converting the digital TV signal for analog broadcasting separated by the separating means into an analog signal, and an output signal of the D / A converting means for analog broadcasting T
Analog transmitting means for transmitting as a V signal.

In this case, a digital broadcast TV signal and another digital broadcast signal are multiplexed to generate a first multiplexed signal, and the first multiplexed signal and the analog broadcast TV signal are converted into a digital signal. A second multiplexed signal further multiplexed with the converted digitized analog broadcast TV signal is sent to a transmitting station. The transmitting station separates the first multiplexed signal and the digitized analog broadcast TV signal, performs digital transmission based on the first multiplexed signal, and returns the digitized analog broadcast TV signal to an analog signal. Since the analog transmission is performed after that, the simulcast can be performed by one system of transmission means.

Here, the transmitting means is a so-called STL, a modulating means for modulating an input signal, a transmitting means for transmitting a signal modulated by the modulating means, and a receiving means for receiving a signal transmitted from the transmitting means. And a demodulating means for demodulating a signal received by the receiving means.

Further, it is preferable that the other digital broadcast signal includes at least one of an audio broadcast signal and a data broadcast signal. Also, the first
The multiplexing means preferably performs multiplexing according to a multiplexing method specified by MPEG2 Systems, and the second multiplexing means preferably performs multiplexing according to a time division multiplexing method.

In another aspect of the present invention, a digital broadcast T
First multiplexing means for multiplexing the V signal and another digital broadcast signal to output a first multiplexed signal; and converting the analog broadcast TV signal into a digital signal to convert the analog broadcast TV signal into a digital signal. A / D conversion means for outputting a digital analog TV signal and a digital TV signal
Signal selecting means for selecting one of the V signals as an analog broadcast signal; and multiplexing the analog broadcast signal selected by the signal selecting means and the first multiplexed signal to form a second multiplexed signal. A second multiplexing means for outputting, a transmission means for transmitting the second multiplexed signal from the studio to the transmitting station, and a first multiplexed signal and an analog broadcast signal for transmitting the signal transmitted by the transmission means. Separating means, a digital transmitting means for transmitting the first multiplexed signal separated by the demultiplexing means as a digital broadcast signal, and converting the analog broadcasting signal separated by the separating means into an analog signal. The D / A converter includes an analog transmitter that transmits an output signal of the D / A converter as an analog broadcast signal.

In this case, a digital analog broadcast TV
One of the signal and the digital broadcast TV signal is selected as an analog broadcast signal, and a second multiplexed signal obtained by multiplexing the analog broadcast signal and the first multiplexed signal is transmitted to a transmitting station. At the transmitting station, the second multiplexed signal is separated into a first multiplexed signal and a digitized analog broadcast signal, and the first multiplexed signal is transmitted as a digital broadcast signal. Is converted back to an analog signal and then transmitted as an analog broadcast signal.
An analog broadcast program can be obtained from both digital broadcast TV signals and analog broadcast TV signals.

According to another aspect of the present invention, one of a digital broadcast standard TV signal and a digital broadcast high-definition TV signal is multiplexed with another digital broadcast signal to form a first digital broadcast signal.
First multiplexing means for outputting a multiplexed signal, A / D conversion means for converting an analog broadcast TV signal into a digital signal and outputting a digitized analog broadcast TV signal, and a first multiplexed signal. During the period when the digital broadcast standard TV signal is output, one of the digitized analog broadcast TV signal and the digital broadcast standard TV signal is selected as the analog broadcast TV signal, and the digital signal is output as the first multiplexed signal. In the period during which the broadcast high-definition TV signal is output, a signal selecting means for selecting the digitized analog broadcast TV signal as the analog broadcast TV signal, and the analog broadcast TV signal selected by the signal selecting means and the first signal. Multiplexing means for multiplexing the multiplexed signal with the multiplexed signal and outputting a second multiplexed signal, and transmitting the second multiplexed signal from the studio to the transmitting station. Means for separating the signal transmitted by the transmitting means into a first multiplexed signal and a TV signal for analog broadcasting, and a first multiplexed signal separated by the separating means. Digital transmission means for transmitting as a digital broadcast signal; D / A conversion means for converting an analog broadcast TV signal separated by the separation means into an analog signal; and an output signal of the D / A conversion means as an analog broadcast TV signal Analog transmitting means for transmitting.

In this case, during the period in which the high definition TV signal for digital broadcasting is output as the first multiplexed signal, the standard TV for digitized analog broadcasting is selected as the TV signal for analog broadcasting. Can broadcast.

[0018]

FIG. 1 is a block diagram showing the configuration of a simulcast broadcasting system according to an embodiment of the present invention.
This simulcast system uses SDTV (standard television)
Studio masters 1-1 to 1-3, HDTV (high definition television) studio master 2, audio broadcasting studio master 3, data broadcasting studio master 4, SDTV MPEG encoders 5-1 to 5-3, HDTV MPEG encoder 6, Encoder 7, multiplexers 8 and 9, digital STL
(Studio to Transmitter Li
nk) 10, demultiplexer 11, D / A converter 1
2, an analog transmitter 13, a digital transmitter 14, an analog TV studio master 15, an A / D converter 16, a distributor 17, and a switch 18.

SDTV Studio Master 1-1 to 1-3
Is a system for transmitting a program similar to that of the current television in a digital system, and outputs a standard TV signal for digital broadcasting (hereinafter, SD signal) having 525 scanning lines in an interlaced system, for example. Usually, a program transmitted from any one of the SDTV studio masters 1-1 to 1-3 is set as a simulcast program, that is, a program broadcast in both analog and digital. It should be noted that a bandwidth of 6 MHz corresponding to one transmission channel of the current television broadcast, 20
In the case of broadcasting at a bit rate of Mbps, a television broadcast having 525 scanning lines can be simultaneously broadcasted on three channels in an interlaced system, but a television broadcasting having 525 scanning lines in a progressive (no interlace) system can be performed. Only two channels can be broadcast at the same time.

The HDTV studio master 2 is a system for transmitting a high-definition television program in a digital system. For example, a high-definition TV signal for digital broadcasting (hereinafter, HD signal) having 1125 scanning lines in an interlaced system is output. I do. However, since the high-definition television broadcast requires much of the capacity frame for one transmission channel, the above-described standard television broadcast cannot be performed simultaneously with the high-definition television broadcast. That is, digital television broadcasting in this simulcasting system is divided into two types: high-definition television broadcasting only and standard television broadcasting of up to three channels.

The audio broadcasting studio master 3 is for performing various audio broadcasting such as the above-mentioned sub-audio of the standard television and an independent music program, and outputs a digitized audio broadcasting signal.

The data broadcasting studio master 4 includes information services other than the standard television broadcasting, high-definition television broadcasting and audio broadcasting, such as text broadcasting, weather and time, and the like.
Alternatively, an EPG (Ele) for selecting a TV broadcast program
It is for performing various data broadcasts such as a Cronical Program Guide service, and outputs a digitized data broadcast signal.

Here, these SDTV studio masters 1-1 to 1-3, HDTV studio master 2, audio broadcasting studio master 3, and data broadcasting studio master 4
Are all master systems for digital broadcasting, which are collectively controlled by a controller (not shown) via a high-speed LAN for broadcasting or the like, and each signal transmission timing is managed according to a preset program organization chart.

On the other hand, the analog TV studio master 15 is a current analog broadcast studio master, and outputs an analog TV signal having 525 scanning lines, for example, in an interlaced system. Here, analog TV studio master 1
5 and the SDTV studio master 1-1 have a corresponding program organization for realizing simultaneous broadcasting. However, the programs do not need to be completely the same, as long as the broadcast categories are the same. In this simultaneous broadcasting system, the program from the analog TV studio master 15 and the SDTV
Simultaneous broadcasting is realized by analog broadcasting one of the programs from the studio master 1-1.

The operation of the simultaneous broadcasting system when actually performing simultaneous broadcasting will be described below. On the digital broadcast side, the SD signal output from the SDTV studio master 1-1 is transmitted via the distributor 17 to the SDTV MP.
The SD signal input to the EG encoder 5-1 and output from the SDTV studio masters 1-2, 1-3 is converted to an SDTV
To the MPEG encoders 5-2 and 5-3. S
The DTV MPEG encoders 5-1 to 5-3 encode the input SD signal by an appropriate encoding method conforming to the MPEG2 standard, and obtain a signal obtained as a result (hereinafter, referred to as a “signal”).
The coded SD signal is output to the multiplexer 8.

The HD signal output from the HDTV studio master 2 is input to an HDTV MPEG encoder 6. The HDTV MPEG encoder encodes the input HD signal by an appropriate encoding method that also conforms to the MPEG2 standard, and outputs the resulting signal (hereinafter, “encoded HD signal”) to the multiplexer 8. .

Further, the audio broadcast signal output from the audio signal studio master 3 is converted by the encoder 7 into an MPEG2
And a signal obtained as a result (hereinafter, a signal for coded audio broadcasting) is output to the multiplexer 8. The data broadcasting signal from the data broadcasting studio master 4 is sent to the multiplexer 8 as it is.

The multiplexing device 8 encodes the coded SD signals from the SDTV MPEG encoders 5-1 to 5-3,
Each signal is multiplexed using the encoded HD signal from the MPEG encoder 6, the encoded audio broadcast signal from the encoder 7, and the data broadcast signal from the data broadcast studio master 4 as input signals.

However, some of the coded SD signal, the coded HD signal, the coded audio broadcast signal, and the data broadcast signal are input to the multiplexer 8 according to the program organization chart at that time. You. The multiplexing device 8 multiplexes these signals according to a multiplexing method specified by MPEG2 Systems, and outputs the multiplexed signal to the multiplexing device 9. Note that, as described above, since the standard television broadcast and the high-definition television broadcast are not simultaneously performed due to the transmission capacity frame, the coded SD signal and the coded HD signal are not multiplexed.

On the analog broadcast side, the switch 18 switches which of the analog TV studio master 15 and the SDTV studio master 1-1 is to be broadcast.

More specifically, when a program from the analog TV studio master 15 is broadcasted in an analog manner (hereinafter referred to as type A), the switch 18 is connected to the A / D converter 16.
Side, and the analog TV signal output from the analog TV studio master 15 is output to the A / D converter 16.
After being converted into a digital signal, the signal is sent to the multiplexer 9 via the switch 18.

On the other hand, when the program from the SDTV studio master 1-1 is analog-broadcast (hereinafter referred to as type B), the switch 18 is switched to the distributor 17 and
SD signal from DTV studio master 1-1 is distributed to distributor 1
7 and to the multiplexer 9 via the switch 18. Hereinafter, the SD signal sent to the analog broadcast side is referred to as an analog broadcast SD signal.

The multiplexing device 9 receives the analog TV signal (at the time of type A) or the SD signal for analog broadcasting (at the time of type B) sent from the analog broadcasting side and the multiplexing device 8 on the digital broadcasting side. The multiplexed signal is multiplexed with the multiplexed signal and output to the digital STL 10.

The digital STL 10 is a broadcast relay line connecting the studio of the broadcasting station and the transmitting station, and transmits the multiplexed signal input from the multiplexing device 9 on the studio side to the demultiplexing device 11 on the transmitting station side.

FIG. 2 is a diagram showing a specific configuration of the digital STL 10. As shown in the figure, the digital STL 10 includes a modulator 21, an amplifier 22, and a transmitter 23 on the studio side, and a receiver 24, an amplifier 25, and a demodulator 26 on the transmitting side. On the studio side, the multiplexed signal input from the multiplexer 9 is modulated by the modulator 21,
After being amplified by the amplifier 22, it is transmitted from the transmitter 23. Note that the modulator 21 performs modulation processing such as QAM (quadrature amplitude modulation). The carrier wave at the time of transmission by the transmitter 23 is, for example, 3.4 GHz, 7 GHz.
A microwave such as z or 13 GHz is used.

On the transmitting side, the receiver 24 receives the signal from the transmitter 23, amplifies the signal with the amplifier 25, and then demodulates the signal with the demodulator 26 corresponding to the modulator 21, thereby obtaining the multiplexing device. 9 generates a multiplexed signal equivalent to that input to the modulator 21 and outputs it to the distributor 10.

Referring back to FIG. 1, the demultiplexer 11 separates the multiplexed signal transmitted via the digital STL 10 into a digital broadcast signal and an analog broadcast signal as described below. Output to the digital transmitter 14 and the D / A converter 12. That is, a multiplexed signal equivalent to the multiplexed signal output from the multiplexing device 8 as a digital broadcast signal is sent to the digital broadcaster 14, and as an analog broadcast signal, an analog TV signal is output for type A, and an analog TV signal is output for type B. The broadcast SD signal is sent to the D / A converter 12.

In this case, the digital transmitter 14 on the digital broadcast side transmits the multiplexed signal input from the demultiplexer 11 as a digital broadcast signal. On the other hand, on the analog broadcast side, analog TV signals or analog broadcast SD
The signal is converted into an analog signal by the D / A converter 12, and the analog transmitter 13 transmits the converted signal as an analog broadcast signal.

As a result, the digital transmitter 14 simultaneously broadcasts a maximum of three systems of standard television broadcasting or high-definition television broadcasting, audio broadcasting and data broadcasting, thereby realizing digital multi-channel broadcasting. On the other hand, the program transmitted from the analog TV studio master 15 at the time of type A by the analog transmitter 13 and the program transmitted from the SDTV studio master 1-1 at the time of type B are analog broadcast.

Next, in this simultaneous broadcasting system,
A case where broadcasting is performed according to a program organization chart as shown in FIG. 3 will be described. Here, on the digital broadcasting side, the programs of the three standard televisions 51 corresponding to channels ch1 to ch3 are transmitted by the SDTV studio masters 1-1 to 1-3 in FIG. It is assumed that the program of the definition television 52 is transmitted by the HDTV studio master 2. Further, channels ch11 and ch12
The two independent audios corresponding to the audio broadcasting studio master 3
And channel ch101, c
Two data programs corresponding to h102 are transmitted by the data broadcast studio master 54.

On the other hand, on the analog broadcasting side, channel ch
1 is set as a simulcast channel. On the digital broadcast side, first, from 9:00 to 10:00, three standard television programs 51 corresponding to channels ch1 to ch3 are broadcast, and a data program 54 corresponding to channel ch101 is broadcast. Become.

Next, between 10:00 and 11:00, the program of the high-definition television 5 corresponding to channel ch4 and the data program 54 corresponding to channel ch101 are broadcasted, resulting in two-channel broadcasting. Since two standard television programs 52 corresponding to channels ch1 and ch2, two independent sounds 53 corresponding to channels ch11 and ch12, and two data programs 54 corresponding to channels ch101 and ch102 are broadcast. As a whole, it becomes a 6-channel broadcast.

On the analog broadcast side, either the current analog TV 55 or the standard television 51 of the channel ch1 on the digital broadcast side is broadcast according to the setting of the switch 18. Therefore, for example, from 9:00 to 10:00, analog broadcasting corresponding to the program of the standard television 51 of the channel ch1 is performed (flow indicated by a dotted line).
From 11:00 to 11:00, the program of the analog TV 55 is broadcast as it is (the flow indicated by a solid line), and the program of the standard channel 51 on the channel ch1 is broadcasted from 11:00, such as a program of the same channel ch1. Supply source changes.

Next, FIG. 4 shows a simulcast broadcasting system which can be inferred from the prior art as a comparative example. In this case, in this case, the SD signal output from the SDTV studio master 31-1 is divided by the distributor 35 into an analog side and a digital side. On the analog side, this SD signal is
The signal is converted into an analog signal by the A converter 42, and the analog signal is converted into an analog STL (Studio to Transmit).
After transmitting from the studio to the transmitting station via the ter link (43), the signal is transmitted by the analog transmitter 44.

On the other hand, on the digital side, the SD signal from the SDTV studio master 31-1 sent from the distributor 35 is encoded by the SDTV MPEG encoder 36-1, and similarly from the SDTV studio masters 31-2 and 32-3. SD signal of the MPEG encoder for SDTV 36-2,3
6-3, the HD signal from the HDTV studio master 32 is encoded by the HDTV MPEG encoder 37, and these are multiplexed by the multiplexing device 39 into the audio broadcast signal (encoder 3) from the audio broadcast studio master 33.
8) and after multiplexing with the data broadcast signal from the data broadcast studio master 34, the digital STL 40
And transmitted from the studio to the transmitting station, and transmitted from the digital transmitter 41.

As a result, the SDTV studio master 31-
The program transmitted from 1 will be broadcast in both analog and digital. However, since the two STLs of the analog STL 43 and the digital STL 40 are required, even if the analog STL 43 already exists, , A digital STL 40 must be installed separately. Besides, analog STL43 and digital ST
It is necessary to change the frequency with L40.

On the other hand, in the simulcast system of the present embodiment, the multiplexing device 9 on the studio side converts the analog TV signal for analog broadcasting (at the time of type A) or the SD signal for analog broadcasting (at the time of type B). After multiplexing a multi-channel multiplexed signal for digital broadcasting and transmitting the multiplexed signal via the digital STL 10, the multiplexing / demultiplexing device 11 at the transmitting station separates the signal into signals for analog broadcasting and digital broadcasting. And analog and digital broadcasting.

That is, unlike the method shown in FIG. 4 in which the program to be simultaneously broadcast in the studio is distributed to the analog side and the digital side and transmitted to the transmitting station using different STLs, a single digital STL 9 is used. Simultaneous broadcasting can be realized only through the above. In this case, since simultaneous broadcasting can be performed at one frequency for the digital STL 9, even if the terrestrial digital broadcasting is developed on a nationwide scale, the required frequency does not increase.

In addition, since the analog broadcast program can be arbitrarily selected from the current analog broadcast program and the digital broadcast standard TV broadcast program, only the digital broadcast standard TV broadcast program is analog broadcast. Unlike the case where the present invention is applied to analog broadcasting, analog and digital programs do not have to be completely identical in simulcasting, and the program organization of analog broadcasting can be flexibly performed.

[0050]

As described above, according to the present invention, a digital broadcast TV signal and another digital broadcast signal are multiplexed to generate a first multiplexed signal, which is multiplexed with a digital analog broadcast signal. The second multiplexed signal multiplexed with the TV signal is sent to the transmitting station, where the first multiplexed signal and the digitized analog broadcast TV signal are separated at the transmitting station, and based on the first multiplexed signal. Since the digital transmission is performed and the digitized analog broadcast TV signal is converted back to an analog signal and transmitted analogly, the simulcast can be performed by one system of transmission means (STL).

When using analog television broadcasting, an analog broadcasting program can be obtained from each of analog television broadcasting and digital television broadcasting. Further, when the standard TV broadcast and the high-definition TV broadcast are switched on the digital broadcast side, during the period when the digital broadcast high-definition TV signal is output, the standardized analog broadcast standard TV is used.
Since V is selected as an analog broadcast signal, simultaneous broadcast can always be appropriately performed.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a simulcast system according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of an STL in FIG. 1;

FIG. 3 is an exemplary view showing an example of broadcasting by the simulcast system of the embodiment;

FIG. 4 is a block diagram showing a configuration of a conventional simulcast system.

FIG. 5 is a diagram for explaining conventional digital broadcasting.

[Explanation of symbols]

 1-1 to 1-3 SDTV studio master 2 HDTV studio master 3 Audio broadcasting studio master 4 Data broadcasting studio master 5 SDTV MPEG encoder 6 MPEG encoder for SDTV 7 Encoder 8, 9 Multiplexer 10 Digital STL 11 Demultiplexer 12 D / A converter 13 Analog transmitter 14 Digital transmitter 15 Analog TV studio master 16 A / D converter 17 Distributor 18 Switch

Claims (6)

[Claims] A first multiplexing means for multiplexing a digital broadcast TV signal and another digital broadcast signal to output a first multiplexed signal; and converting an analog broadcast TV signal into a digital signal. A / D conversion means for outputting a digitized analog broadcast TV signal, and multiplexing the digitized analog broadcast TV signal and the first multiplexed signal to output a second multiplexed signal. Multiplexing means; transmitting means for transmitting the second multiplexed signal from a studio to a transmitting station; and transmitting the signal transmitted by the transmitting means to the first multiplexed signal and the digitalized analog broadcast signal. Separation means for separating the signal into a TV signal; digital transmission means for transmitting the first multiplexed signal separated by the separation means as a digital broadcast signal; and a digital signal separated by the separation means A D / A converter for converting a converted analog broadcast TV signal into an analog signal, and an analog transmitter for transmitting an output signal of the D / A converter as an analog broadcast TV signal. system. 2. A first multiplexing means for multiplexing a digital broadcasting TV signal with another digital broadcasting signal to output a first multiplexed signal, and converting the analog broadcasting TV signal into a digital signal. A / D conversion means for outputting a digitized analog broadcast TV signal, and converting one of the digitized analog broadcast TV signal and the digital broadcast TV signal to an analog broadcast TV signal.
A signal selecting means for selecting as a V signal; and an analog broadcasting TV selected by the signal selecting means.
Second multiplexing means for multiplexing a signal and the first multiplexed signal to output a second multiplexed signal; transmission means for transmitting the second multiplexed signal from a studio to a transmitting station Separating means for separating the signal transmitted by the transmitting means into the first multiplexed signal and the analog broadcast TV signal; and digitally broadcasting the first multiplexed signal separated by the multiplexing / demultiplexing means. Digital transmitting means for transmitting as a signal; D / A converting means for converting the analog broadcasting TV signal separated by the separating means into an analog signal; transmitting an output signal of the D / A converting means as an analog broadcasting TV signal A simulcast broadcasting system comprising: 3. A first multiplexing means for multiplexing one of a digital broadcasting standard TV signal and a digital broadcasting high definition TV signal with another digital broadcasting signal and outputting a first multiplexed signal. A / D conversion means for converting an analog broadcasting TV signal into a digital signal and outputting a digitized analog broadcasting TV signal; and the digital broadcasting standard T as the first multiplexed signal.
In a period during which the V signal is output, one of the digitized analog broadcast TV signal and the digital broadcast standard TV signal is selected as an analog broadcast TV signal, and the digital broadcast is used as the first multiplexed signal. A signal selecting unit for selecting the digitized analog broadcast TV signal as an analog broadcast TV signal during a period in which the high definition TV signal is output, and an analog broadcast TV selected by the signal selecting unit.
Second multiplexing means for multiplexing a signal and the first multiplexed signal to output a second multiplexed signal; transmission means for transmitting the second multiplexed signal from a studio to a transmitting station Separating means for separating the signal transmitted by the transmitting means into the first multiplexed signal and the analog broadcast TV signal; and converting the first multiplexed signal separated by the separating means into a digital broadcast signal. Digital transmitting means for transmitting as an analog signal; D / A converting means for converting the analog broadcast TV signal separated by the separating means into an analog signal; and transmitting the output signal of the D / A converting means as an analog broadcast TV signal. A simulcast system comprising an analog transmission unit. 4. The transmitting means includes: a modulating means for modulating an input signal; a transmitting means for transmitting a signal modulated by the modulating means; and a receiving means for receiving a signal transmitted from the transmitting means. 4. The simulcast system according to claim 1, further comprising: a demodulator for demodulating a signal received by said receiver. 5. The digital broadcast signal according to claim 1, wherein the other digital broadcast signal includes at least one of an audio broadcast signal and a data broadcast signal. Simulcast system. 6. The first multiplexing means performs multiplexing according to a multiplexing method specified by MPEG2 Systems, and the second multiplexing means performs multiplexing according to a time division multiplexing method. The simulcast system according to any one of claims 1 to 3, wherein