JP2009171381A - Terrestrial digital independent broadcast system and apparatus therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem, wherein since only a single network ID is given to a cable television provider, channels capable of offering independent broadcast services thereof are limited and channel switching selection becomes complicated. <P>SOLUTION: According to a terrestrial digital independent broadcast system, on the transmitting side, digitized independent broadcast signals are multiplexed into a TS signal, it is modulated according to a method other than OFDM modulation to produce a single channel signal, and two or more channels signals similarly produced are mixed and sent to a transmission path. On the receiving side, an independent broadcast signal of a desired channel is selected from among the channel signals received, the selected independent broadcast signal is demodulated, and then is subjected to OFDM modulation and inputted to a TV receiver, corresponding to terrestrial digital broadcast, the OFDM signal is demodulated in the TV receiver to display independent broadcast on a display 23 of the TV receiver, and the channel selection is switched, so that the independent broadcast of the desired channel can be switched and displayed on the display of the TV receiver. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a terrestrial digital (OFDM) independent broadcasting system and its apparatus, and can be used in digital CATV, IP broadcasting, hotels, schools, companies, bicycle races, horse races, racetracks, etc.

  The current terrestrial digital independent broadcasting system using the digital CATV system is as shown in FIG. In FIG. 4, the digitized video source (independent broadcast signal) is compressed by an MPEG2 encoder provided at the head end on the transmission side, and the compressed signal and the data broadcast signal are converted into a transport stream (TS) by a multiplexer. The B-CAS scrambler is scrambled, and the scrambled signal is modulated by an OFDM (Orthogonal Frequency Division Multiplexing) modulator to generate an OFDM signal, which is transmitted to the receiving side via a CATV transmission path. The transmitted OFDM signal is received by the set-top box (STB) of the CATV subscriber's house on the receiving side, demodulated by the OFDM receiver (OFDM-NIM: Network Interface Module) in the STB, and decoded (decompressed) by the MPEG decoder Then, it is sent to a video input / output terminal (D terminal) of a television receiver (TV receiver) compatible with terrestrial digital broadcasting and displayed on the display of the TV receiver.

  As the independent broadcasting system, there is a transmission system using an IP network for IP broadcasting (video distribution for TV using an IP multicast network) as shown in FIG. The video source is compressed by the MPEG2 encoder at the head end of the transmission side, and the compressed signal is multiplexed with an electronic program guide (EPG) or the like by a multiplexer to generate a TS. The TS is converted by a TS / IP converter. An IP signal of one channel is generated by being converted into an IP signal, and a multi-channel IP signal generated in the same manner is switched and selected by a switch (HUB), and the selected IP signal is transmitted to the IP network via a router. Sent out. The IP signal is received by the IP set top box (IP-STB) at the receiving side IP subscriber's home via the router and converted to TS, and the TS is decompressed (decoded) by the MPEG decoder, and the release signal Is sent to the NTSC terminal of the TV receiver and displayed on the display of the TV receiver.

The terrestrial digital independent broadcasting system using the CATV system of FIG. 4 has the following problems.
(1) Since only one network ID (one type of OFDM frequency) is given to the cable operator, a maximum of 3 channels for HDTV (high definition) can be used for SDTV (standard definition) broadcasting in the case of independent broadcasting service. Degree) Broadcasting is limited to one channel.
(2) Since the modulation method of the cable dedicated channel (independent broadcasting) performed in the CATV system is QAM modulation, STB is essential for reception. When independent broadcasting is performed using OFDM, the current STB can scramble for rights protection (copy control) but cannot restrict viewing of the independent broadcasting.
(3) When self-broadcasting is serviced by a digital CATV system (QAM modulation system), a network switching operation at the STB is necessary for receiving the self-broadcast, and two types of remote controllers for STB and TV are used for channel selection. Operation is necessary and user-friendliness is bad.
(4) As shown in FIG. 4, the TV V / U input terminal, BS / CS input terminal, and the OFDM-NIM, BS / CS NIM, and MPEG decoder built in the TV are not used and are wasted.

  Since the self-broadcasting system using the IP network of FIG. 5 is a system using the current IP-STB, there is a problem that the usability of the remote control operation is poor.

  The present invention makes it possible to perform terrestrial digital independent broadcasting of a large number of channels with one network ID (one kind of OFDM frequency) by using a mechanism such as a digital CATV system or an IP broadcasting network, and autonomously use an OFDM-modulated cable specialized channel. Broadcasting is also possible, and viewers can select and view these independent broadcasts with a TV receiver compatible with digital terrestrial broadcasting.

  In the terrestrial digital self-broadcasting system of the present invention, on the transmitting side, the self-broadcast signal is digitized and multiplexed to form a transport stream (TS), and the TS is modulated by a method other than the OFDM method to generate one channel signal. The two or more channel signals generated in the same manner are mixed and transmitted to the transmission line, the mixed signal is received by the set-top box (STB) on the receiving side, and the independent broadcast signal of the desired channel is received from the received channel signal. The selected independent broadcast signal is demodulated, then OFDM-modulated and input to a TV receiver compatible with digital terrestrial broadcasting. The TV receiver demodulates the OFDM signal and displays the independent broadcast on the display of the TV receiver. By switching the channel, the independent broadcast of the desired channel is switched to the TV receiver display. For example is a display possible with the system.

  In the terrestrial digital independent broadcasting system, on the transmitting side, the independent broadcasting signal is multiplexed with other signals such as a data broadcasting signal and a contract information signal (EMM) and transmitted to the transmission line, and the desired channel is determined from the mixed signal received by the STB. The independent broadcast signal is selected and demodulated, the other signal is superimposed on the demodulated signal, the superimposed signal is OFDM-modulated and input to the TV receiver, and the OFDM signal is demodulated in the TV receiver to receive the TV image. It can also be displayed on the machine display. On the transmission side, the independent broadcast signal is multiplexed into a TS, and other signals such as a data broadcast signal and a contract information signal (EMM) are multiplexed into a dedicated TS, and both multiplexed signals are mixed and transmitted. Independently, the self-broadcast signal of the desired channel is selected from the mixed signal received by the STB and demodulated, and another signal is extracted from the mixed signal, and the demodulated self-broadcast signal and the extracted other signal Can be superimposed, and the superimposed signal can be OFDM-modulated and input to the TV receiver. In these terrestrial digital independent broadcasting systems, the mixed signal received by the STB and the OFDM signal branched from the mixed signal and subjected to OFDM modulation can be mixed in the STB and input to the TV receiver.

  In any of the above terrestrial digital independent broadcasting systems, carrier modulation can be performed by a system other than OFDM after the TS is scrambled. In addition, the self-broadcast channel is assigned to the TV remote control key, and the data broadcast screen is automatically displayed on the TV receiver display at the subscriber's home by selecting the desired channel from the mixed signal received by the STB by operating the remote control key. When the desired independent broadcast channel is selected from the data broadcast screen by remote control key operation, the selected channel information is transmitted from the TV receiver to the STB by the bidirectional function of the data broadcast, and the independent broadcast of the channel is selected in the STB. It can also be displayed on the display of the TV receiver.

  In the terrestrial digital self-broadcasting system, viewing availability information for each channel is acquired from the contract information (EMM) in the STB, and viewing is possible on the TV receiver only when viewing is possible, and on the TV receiver display when viewing is not possible. An unviewable display can also be made.

  The terrestrial digital independent broadcasting system is a case where the transmission path of the CATV system is used as a transmission path. However, in the terrestrial digital independent broadcasting system of the present invention, an IP network can be used for the transmission path. The self-broadcast signal is digitized on the side, multiplexed and converted into a TS, and the TS is converted to an Internet protocol signal (IP signal) (TS / IP) to generate one channel signal. The IP signal of the channel is generated, two or more IP signals are switched and selected, sent to the IP network, these IP signals are received by the Internet set-top box (IP-STB), and in the IP-STB, Select the IP signal of the desired channel from the many received IP signals, perform IP / TS conversion, and OFDM-modulate the converted TS It is input to a TV receiver compatible with digital broadcasting, the OFDM signal is demodulated in the TV receiver, the independent broadcast is displayed on the display of the TV receiver, and the independent broadcast of the desired channel is switched to the TV by selectively switching the channel. The display can be switched and displayed on the display of the receiver.

  The terrestrial digital self-broadcasting apparatus of the present invention includes a transmission side, a reception side, and a transmission path connecting the two, and the reception side is compatible with the terrestrial digital broadcasting connected to the STB connected to the transmission path and the STB. An MPEG encoder that compresses a digital independent broadcast signal on the transmission side, and a multiplexer that multiplexes the compressed digital signal with contract information for data broadcasting and viewing control, etc., into a TS, with a TV receiver And one set of transmission equipment including a scrambler that scrambles TS and a modulator other than the OFDM system that performs carrier modulation with a scrambled signal, and two or more sets of transmission equipment are provided. The STB also includes a mixer that mixes two or more channel signals generated by each set of transmission devices, and the STB receives a desired channel from the mixed signal received from the transmission line. A demodulator that demodulates the independent broadcast signal, a multiplexer that multiplexes the demodulated signal and the data broadcast signal, etc., and restores the TS, an OFDM modulator that performs OFDM modulation with the TS, and the modulated OFDM signal to the STB It can be set as the apparatus provided with the mixer which mixes with an input signal.

  In the terrestrial digital independent broadcasting device, on the transmitting side, separately from each set of transmitting devices, contract information (EMM) for data broadcasting and viewing control is multiplexed and a dedicated transport stream (dedicated TS) is multiplexed. A multiplexer for generating and a modulator for modulating the dedicated TS by a method other than the OFDM method, the mixer is capable of mixing the modulated signal of the dedicated TS and the TS modulated signals of the two or more channels; The STB on the receiving side includes a TS demodulator that selects and demodulates an independent broadcast signal of a desired channel from the received mixed signal, and a dedicated TS demodulator that demodulates a data broadcast or an EMM signal from the dedicated TS of the mixed signal. An independent broadcast demodulated by the TS demodulator, a multiplexer for multiplexing the data broadcast signal demodulated by the dedicated TS demodulator, an OFDM modulator for modulating the multiplexed signal, an OF It can be a device having a mixer for mixing the input signal to the STB the M modulated signals.

The present invention has the following effects.
1. Since OFDM modulation is not performed on the transmission side, but OFDM modulation is performed on the reception side STB, then OFDM demodulation is performed. In addition, the service of the cable specialized channel becomes possible. Moreover, there is no need to send a cable-specific TV channel over a separate network.
2. On the transmission side, each channel is scrambled and the contract information is transmitted to the STB by the EMM, so that viewing control for each channel is possible.
3. There is no need to switch the network on the TV receiver, making it easy to use.
4). Since the subscriber can control the channel selection between the normal channel and the independent broadcast by operating the TV remote control, convenience is improved.
5. Since the image is received by the function of the TV receiver compatible with terrestrial digital broadcasting, there is no waste of equipment in the TV receiver such as OFDM-NIM and MPEG decoder.
6). Similarly, the IP broadcast can be deleted by using the MPEG decoder and can be operated with a single remote controller.
7). Since channel selection can be realized by the bidirectional function of data broadcasting of terrestrial digital broadcasting, it is not necessary to separately transmit a signal for channel selection.

  An example of a terrestrial digital (OFDM) self-broadcasting method and apparatus using the CATV system of the present invention is shown in FIG. FIG. 1 shows a case where signal transmission from the transmission side is performed using a coaxial cable (transmission path) such as CATV or a hearing facility. In FIG. 1, the signal sent to the transmission line is QAM (Quadrature Amplitude Modulation), but the present invention is not limited to the QAM modulation method, and other modulation methods such as QPSK, 16QAM, and 64QAM You can also

  There are various methods for transmitting the independent broadcast RF signal (video source, audio source) of the CATV system from the transmission side to the reception side, but there is a method using a digital CATV mechanism capable of transmitting a plurality of channel QAM signals. Is suitable. The apparatus of FIG. 1 is an example thereof, and the transmission side and the reception side have the following features, respectively.

(Embodiment 1: Configuration and operation of transmission side in FIG. 1)
1 is equipped with an MPEG2 encoder 2, a multiplexer 3, a B-CAS scrambler 4, a QAM modulator 5, and a mixer 6.

  In the head end 1 of FIG. 1, the independent broadcast RF signal (video source / audio source) of one channel is encoded (image compression) by the MPEG2 encoder 2 of FIG. 1, and the compressed signal and the channel of the independent broadcast are selected. A data broadcast signal (data carousel signal) for use, individual contract information (EMM) of each receiver for viewing control, etc. are multiplexed into a TS by a multiplexer 3 and scrambled by a B-CAS scrambler 4 Program attribute information (scramble key: ECM) common to the receiver is inserted, and the scrambled multiplexed signal is QAM modulated by the QAM modulator 5 to generate a QAM signal (CATV signal) of one channel, The channel independent broadcast RF signal is also encoded, multiplexed, scrambled, QAM modulated and other channels in the same manner. Generates a CATV signal Le, sends a CATV transmission path as CATV independent broadcasting signal by mixing the CATV signals of two or more channels in the mixer 6. The data carousel signal and EMM are always multiplexed.

(Configuration and operation on the receiving side in FIG. 1)
A set top box (hereinafter referred to as “STB”) is connected in front of the terrestrial digital TV receiver (hereinafter referred to as “TV receiver”) on the receiving side (subscriber's home) in FIG. The STB includes a branching device 11, a QAM receiving unit (QAM-NIM) 12, a multiplexer 13, an OFDM modulator 14, a mixer 15, a CPU 16, and an ether terminal 17. The TV receiver (TV) includes a D terminal, a U / V terminal, a BS / 110CS terminal, an OFDM receiver (OFDM-NIM) 18, a BS / CS receiver (BS / CS-NIM) 19, a switch 20, and an MPEG decoder 21. , A switch 22, a display 23, and an ether terminal 24. The ether terminal 24 is connected to the ether terminal 17 of the STB by a HUB (concentrator) 25.

  The independent broadcast RF signal in the CATV independent broadcast signal input to the STB in FIG. 1 is input to the mixer 15 through, and a part of the CATV independent broadcast signal is branched by the branching device 11 and input to the QAM-NIM 12 for demodulation. Is done. When an independent broadcast program is selected by a remote control key operation from the data broadcast screen displayed on the display 23 of the TV receiver of FIG. 1, the TV terminal Ethernet terminal 24 to the STB ether terminal 17 are operated by the bidirectional function of the data broadcast. Based on the selected channel information received through the ether terminal 17, the CPU 16 in the STB controls the frequency of the QAM-NIM 12, and the video signal and audio of the channel corresponding to the frequency of the selected channel are transmitted. A signal (RF signal) and an ECM stream are extracted. The extracted RF signal of the channel is multiplexed with the data carousel signal of the data broadcast by the STB multiplexer 13, OFDM-modulated by the OFDM modulator, and mixed with the through signal by the mixer, and the U / V of the TV receiver. Input to the input terminal. The RF signal received by the TV receiver is demodulated by the OFDM-NIM 18 of the TV, decoded by the MPEG decoder 21 and displayed on the display 23.

  The channel selection is performed as follows. The independent broadcast channel is assigned to the TV remote control key, and by selecting that channel, the independent broadcast can be received. However, a plurality of independent broadcast programs are automatically selected on the TV display 23 after the remote control is operated. Select on the displayed data broadcast selection screen.

  The STB receives the EMM that transmits the viewing control information, acquires viewing availability information for each channel, and multiplexes the streams only when viewing is possible. In the case where viewing is not possible, it is possible to display that the viewing is impossible on the display 23 of the TV receiver by switching to a video stream for displaying the viewing impossible transmitted in advance.

(Embodiment 2: Configuration and operation on the transmission side in FIG. 2)
FIG. 2 shows a second embodiment of the terrestrial digital independent broadcasting system of the present invention. This method multiplexes independent broadcast RF signal (video source / audio source) and data broadcast signal (data carousel signal), individual contract information (EMM) of each receiver for viewing control separately. This is a method in which a dedicated TS is generated by the latter multiplexing. More specifically, an independent broadcast RF signal (video source / audio source) of one channel is encoded (image compression) by the MPEG2 encoder 2 at the head end on the transmission side, and multiplexed by a multiplexer to a TS, The B-CAS scrambler 4 is scrambled, and common program attribute information (scramble key: ECM) is inserted into the receiver, and the scrambled multiplexed signal is QAM-modulated by the QAM modulator 5 to obtain one channel. A QAM signal (CATV signal) is generated, and an independent broadcast RF signal of another channel is encoded, multiplexed, scrambled, and QAM modulated in the same manner to generate a CATV signal of another channel, and two or more channels are generated. The CATV signal is generated. Separately, a data broadcasting signal (data carousel signal) for selecting a channel for independent broadcasting, individual contract information (EMM) of each receiver for viewing control, etc. are multiplexed by a multiplexer 7 to be a dedicated TS. The dedicated QAM is generated by QAM modulation by the QAM modulator 8, and the dedicated QAM and the CATV signals of the two or more channels are mixed by the mixer 6 and sent to the CATV transmission line as a CATV independent broadcast signal.

(Configuration and operation on the receiving side in FIG. 2)
An STB is also connected in front of the TV receiver on the receiving side (subscriber's home) in FIG. The STB is common to the STB of FIG. 1 in that it includes a branching unit 11, a QAM receiving unit 12, a multiplexer 13, an OFDM modulator 14, a mixer 15, a CPU 16, and an ether terminal 17, and the difference is that a dedicated QAM demodulating unit 26 It is equipped with. The TV receiver (TV) is a digital terrestrial broadcast compatible type having the same configuration as that of FIG.

  In the STB of FIG. 2, the independent broadcast RF signal in the received CATV independent broadcast signal is input to the mixer 15 through. On the other hand, a part of the received CATV self-broadcast signal is branched by the branching device 11 and demodulated by the QAM-NIM 12, and the self-broadcast program is operated by remote control key operation from the data broadcast screen displayed on the display 23 of the TV receiver of FIG. Is selected, the selected channel information is transmitted from the ether terminal 24 of the TV receiver to the ether terminal 17 of the STB by the bidirectional function of the data broadcasting, and the CPU 16 in the STB is based on the selected channel information received through the ether terminal 17. The QAM-NIM 12 performs frequency control, and the video signal, audio signal (RF signal), and ECM stream of the channel corresponding to the frequency of the selected channel are demodulated and extracted. Separately, the data broadcast signal and the viewing control signal in the branch signal are demodulated and extracted by the dedicated QAM demodulator 26. The signal extracted by the dedicated QAM demodulator 26 and the signal extracted by the QAM-NIM 12 are multiplexed by the multiplexer 13 and then OFDM-modulated by the OFDM modulator 14. This OFDM modulated signal is mixed with the through signal in the mixer 15 and input to the U / V input terminal of the TV receiver. The RF signal received by the TV receiver is demodulated by the OFDM-NIM 18 of the TV, decoded by the MPEG decoder 21 and displayed on the display 23. The channel selection and viewing permission / inhibition are determined in the same manner as in FIG.

(Third embodiment: transmission using an IP transmission network)
FIG. 3 shows a case where an IP transmission network is used as the transmission path of the present invention. In FIG. 3, on the transmitting side, the independent broadcast TS signal is multiplexed by the multiplexer 3, and the TS is converted (TS / IP) into a signal (IP signal) of the Internet protocol system by the TS / IP converter 27. In the same way, IP signals of other channels are generated. Separately, the data broadcasting signal (data carousel) and the viewing control signal are multiplexed by the multiplexer 7 to generate a dedicated TS, and the TS / IP converter 28 converts it into an IP signal. This IP signal and the IP signal for each channel are switched by a switch (HUB) 29 and sent out to the IP network (network) via the router 30.

  3, the IP signal transmitted through the IP network is transmitted by the switch (HUB) 32 via the router 31 and received by the Internet set-top box (IP-STB) 40. The IP-STB includes an IP / TS converter 41, a multiplexer 42, an OFDM modulator 43, and a CPU 44.

  In the IP / TS, an IP signal of a desired channel is selected from the received IP signal, and the independent broadcast signal of the channel is IP / TS converted into a TS. At this time, the data broadcast signal and the viewing control signal are extracted from the IP-STB by the CPU 44, and the data broadcast signal is multiplexed with the TS signal after the IP / TS conversion, and then subjected to OFDM modulation and sent to the mixer 45. The mixer 45 mixes the signal received by the U / V antenna 46 and inputs it to the U / V of the TV receiver. The received signal is OFDM-modulated by the OFDM-NIM of the TV receiver, coded in MPEG, and displayed on the display of the TV receiver.

  Many independent broadcast programs such as local governments and other organizations can be widely sent to and received from the parties concerned.

Explanatory drawing which shows an example of the independent broadcast system of this invention using a CATV transmission network. Explanatory drawing which shows the other example of the independent broadcast system of this invention using a CATV transmission network. Explanatory drawing which shows an example of the independent broadcast system of this invention using an IP network. Explanatory drawing of the conventional independent broadcast system using a CATV transmission network. Explanatory drawing which shows an example of the conventional independent broadcasting system using an IP network.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Head end 2 MPEG2 encoder 3 Multiplexer 4 B-CAS scrambler 5 QAM modulator 6 Mixer 7 Multiplexer 8 QAM modulator 11 Branching device 12 QAM receiving part (QAM-NIM)
13 Multiplexer 14 OFDM Modulator 15 Mixer 16 CPU
17 Ether terminal 18 OFDM receiver (OFDM-NIM)
19 BS / CS receiver (BS / CS-NIM)
20 switch 21 MPEG decoder 22 switch 23 display 24 ether terminal 25 HUB (concentrator)
26 QAM demodulator 27, 28 TS / IP converter 29 Switch (HUB)
30, 31 router 32 switch (HUB)
40 Internet set-top box (IP-STB)
41 IP / TS converter 42 Multiplexer 43 OFDM modulator 44 CPU
45 Mixer 46 U / V antenna

Claims (10)

On the transmission side, the independent broadcast signal is digitized and multiplexed to form a transport stream (TS), and the TS is modulated by a method other than the OFDM method to generate one channel signal. Mix channel signals and send them to the transmission line.
The mixed signal is received by a set-top box (STB) on the receiving side, a self-broadcast signal of a desired channel is selected from the received channel signal, the selected self-broadcast signal is demodulated, and then subjected to OFDM modulation and terrestrial digital broadcasting Input to a compatible TV receiver,
In the TV receiver, the OFDM signal is demodulated and the independent broadcast is displayed on the TV receiver display.
A terrestrial digital independent broadcasting system characterized in that by selectively switching the channel, the independent broadcasting of a desired channel can be switched and displayed on a display of a TV receiver. In the terrestrial digital independent broadcasting system according to claim 1,
On the transmission side, the independent broadcast signal is multiplexed with other signals such as a data broadcast signal and a contract information signal (EMM) and sent to the transmission line.
Select and demodulate the desired broadcast signal from the mixed signal received by the STB,
A terrestrial digital self-broadcasting system characterized in that the other signal is superimposed on the demodulated signal, the superimposed signal is OFDM-modulated, and input to a TV receiver. In the terrestrial digital independent broadcasting system according to claim 1,
On the transmission side, the independent broadcast signal is multiplexed into a TS, and separately from this, other signals such as a data broadcast signal and a contract information signal (EMM) are multiplexed into a dedicated TS, and both multiplexed signals are mixed into the transmission line. Send out,
Select and demodulate the self-broadcast signal of the desired channel from the mixed signal received by the STB, and separately extract other signals from the mixed signal,
A terrestrial digital self-broadcasting system, wherein the demodulated self-broadcast signal and the extracted other signal are superposed, and the superposed signal is OFDM-modulated and input to a TV receiver. In the terrestrial digital independent broadcasting system according to claim 2 or claim 3,
The mixed signal received by the STB and the OFDM signal branched from the mixed signal and subjected to OFDM modulation are mixed in the STB and input to the TV receiver,
A terrestrial digital independent broadcasting system characterized in that the OFDM signal is demodulated in a TV receiver and displayed on the display of the TV receiver. In the terrestrial digital independent broadcasting system according to any one of claims 1 to 4,
A terrestrial digital self-broadcasting system that scrambles the TS and then modulates the carrier using a method other than OFDM. In the terrestrial digital independent broadcasting system according to any one of claims 1 to 5,
Assign the independent broadcast channel to the TV remote control key,
By selecting the desired channel from the mixed signal received by the STB by remote control key operation, the data broadcast screen is automatically displayed on the display of the TV receiver at the subscriber's house,
When the desired channel is selected from the display screen by remote control key operation, the selected channel information is transmitted from the TV receiver to the STB by the bidirectional function of data broadcasting.
A terrestrial digital self-broadcasting system, wherein a self-broadcast of the channel is selected and displayed on the display of the TV receiver in the STB.   In the terrestrial digital independent broadcasting system according to any one of claims 1 to 6, the receiving side acquires viewing permission information for each channel from contract information (EMM), and viewing is possible on a TV receiver only when viewing is possible. And a terrestrial digital voluntary broadcasting system characterized in that, when viewing is impossible, the television receiver display displays that viewing is not possible. On the transmission side, the self-broadcast signal is digitized, multiplexed into a TS, and the TS is converted to an Internet protocol signal (IP signal) (TS / IP) to generate an IP signal for one channel. To generate IP signals for other channels,
Select and send the two or more IP signals to the IP network,
These IP signals are received by the Internet set top box (IP-STB) on the receiving side,
In IP-STB, an IP signal of a desired channel is selected from a number of received IP signals and IP / TS converted,
The converted TS is OFDM-modulated and input to a TV receiver compatible with digital terrestrial broadcasting,
In the TV receiver, the OFDM signal is demodulated and the independent broadcast is displayed on the TV receiver display.
A terrestrial digital independent broadcasting system characterized in that by selectively switching the channel, the independent broadcasting of a desired channel can be switched and displayed on a display of a TV receiver. A transmission side and a transmission path connecting the transmission side and the reception side, and the reception side includes an STB connected to the transmission path, and a TV receiver compatible with digital terrestrial broadcasting connected to the STB;
On the transmission side, an MPEG encoder that compresses a digitized independent broadcast signal, a multiplexer that multiplexes the compressed digital signal with contract information for data broadcasting and viewing control, etc., and a TS, and scramble the TS One set of transmission equipment including a scrambler to be applied and a modulator other than the OFDM system that performs carrier modulation with a scrambled signal, two or more sets of transmission equipment are provided,
The transmission side also includes a mixer that mixes two or more channel signals generated by each set of transmission equipment,
The STB is a demodulator that demodulates an independent broadcast signal of a desired channel from a mixed signal received from a transmission path, a multiplexer that multiplexes a demodulated signal and a data broadcast signal, etc., and restores the TS, and an OFDM that performs OFDM modulation using the TS. A terrestrial digital independent broadcasting apparatus comprising a modulator and a mixer for mixing the modulated OFDM signal with the input signal to the STB. In the terrestrial digital independent broadcasting device according to claim 9,
A multiplexer that multiplexes contract information (EMM) for data broadcasting and viewing control and generates a dedicated transport stream (dedicated TS) separately from each set of transmitting devices, and a dedicated TS It also has a modulator that modulates with a method other than the OFDM method,
The mixer can mix the modulation signal of the dedicated TS and the TS modulation signal of the two or more channels,
The STB on the receiving side includes a TS demodulator that selects and demodulates an independent broadcast signal of a desired channel from the received mixed signal, and a dedicated TS demodulator that demodulates a data broadcast or an EMM signal from the dedicated TS of the mixed signal. , The independent broadcast demodulated by the TS demodulator, the data broadcast signal demodulated by the dedicated TS demodulator, etc., the OFDM modulator that modulates the multiplexed signal, and the OFDM modulated signal to the STB A terrestrial digital self-broadcasting device comprising a mixer for mixing with the input signal of

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