WO2011105569A1 - Dispositif de multiplexage, encodeur modulateur numérique et système de diffusion autonome - Google Patents

Dispositif de multiplexage, encodeur modulateur numérique et système de diffusion autonome Download PDF

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Publication number
WO2011105569A1
WO2011105569A1 PCT/JP2011/054361 JP2011054361W WO2011105569A1 WO 2011105569 A1 WO2011105569 A1 WO 2011105569A1 JP 2011054361 W JP2011054361 W JP 2011054361W WO 2011105569 A1 WO2011105569 A1 WO 2011105569A1
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Prior art keywords
signal
digital
broadcast
broadcasting
unit
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PCT/JP2011/054361
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English (en)
Japanese (ja)
Inventor
正樹 鵜飼
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マスプロ電工株式会社
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Publication of WO2011105569A1 publication Critical patent/WO2011105569A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
    • H04N21/236—Assembling of a multiplex stream, e.g. transport stream, by combining a video stream with other content or additional data, e.g. inserting a URL [Uniform Resource Locator] into a video stream, multiplexing software data into a video stream; Remultiplexing of multiplex streams; Insertion of stuffing bits into the multiplex stream, e.g. to obtain a constant bit-rate; Assembling of a packetised elementary stream

Definitions

  • the present invention relates to a multiplexing device that multiplexes digital data obtained by encoding a video signal, an audio signal, and the like, and an encoder, a digital modulator, and an independent broadcasting system provided with the multiplexing device.
  • the standard time information is obtained from a radio clock (or FM broadcast receiver or GPS receiver) provided in the device or a time server (NTP server) on an external network.
  • the time information of the communication control microprocessor is calibrated by the acquired standard time information (see, for example, Patent Document 1).
  • the radio clock or FM broadcast receiver or GPS receiver
  • the radio clock or FM broadcast receiver or GPS receiver
  • this example relates to an independent broadcast system that transmits an independent broadcast signal in addition to a television broadcast signal.
  • a VHF antenna 4 or a UHF antenna 1 is used in a school or a hotel.
  • the analog television broadcast signal RF3 received by the amplifier 2 and amplified by the amplifier 2 and the analog television broadcast signal RF4 for independent broadcasting generated using the analog modulator 50 are mixed by the mixer 17, and the coaxial cable 3 is distributed.
  • Device 18 and serial unit 6 (6a, 6b, 6c, 6d...) Etc. are transmitted to the terminal side so that both the terrestrial analog broadcasting and the independent broadcasting can be viewed on the analog-compatible television 43 on the terminal side.
  • Japanese television broadcasts will be completely digitized in July 2011, and terrestrial analog broadcasts will be completely stopped. Therefore, even in the independent broadcasting system as shown in FIG. 4, as shown in FIG. 5, the unnecessary VHF antenna 4 is removed and the direction of the UHF antenna 1 is readjusted in order to receive terrestrial digital broadcasting. Digital renovation work such as performing
  • the television receiver connected to each terminal is an existing analog-compatible television 43, it is between the serial unit 6 and the analog-compatible television 43.
  • a distributor 41 is provided, and the AV input terminal of the analog-compatible television 43 is connected to one of the distribution outputs of the distributor 41 via the digital tuner 42, and the other distribution output of the distributor 41 is connected to the other distribution output of the analog-compatible television 43.
  • An RF input terminal may be connected.
  • the existing analog modulator 50 provided for the analog independent broadcasting may be replaced with a digital-compatible device so that the digital independent broadcasting is performed using the existing wiring system.
  • an independent broadcast AV signal (audio signal / video signal) obtained from a broadcasting device 15 such as a video camera or a VTR is encoded, and the encoded digital data (video / video) is encoded. Audio data) and other additional information are multiplexed into a signal format called a broadcast TS (Transport Stream) signal and output, and the broadcast TS obtained from the encoder 20 is modulated into an OFDM broadcast signal and output.
  • the modulator 30 may be replaced with the analog modulator 50 and installed.
  • the digital independent broadcast digital television broadcast signal RF2 transmitted from the OFDM modulator 30 and the digital terrestrial broadcast digital television broadcast signal RF1 received by the UHF antenna 1 are mixed by the mixer 17.
  • a terminal device such as a digital-compatible television provided in the house can view not only terrestrial digital broadcasts but also digital independent broadcasts.
  • TOT Time Offset Table
  • the present invention provides a multiplexing device that can always stably acquire low-cost standard time information and multiplex digital data without using a radio-controlled timepiece or an external network. It is an object of the present invention to provide an encoder, a digital modulator, and a self-broadcasting system provided with an encoding device.
  • the multiplexing device provides: Receiving a digital TV broadcast signal, and selecting and demodulating a predetermined channel from the digital TV broadcast signal, thereby acquiring time information included in the signal of the channel; and Multiplexing that multiplexes a plurality of data including digital data obtained by encoding a broadcast signal including at least one of a video signal and an audio signal and time information acquired by the receiving unit, and outputs the multiplexed data as a TS signal for broadcasting And It is provided with.
  • the encoder of the second aspect of the present invention is An encoding unit that encodes and outputs a broadcast signal including at least one of a video signal and an audio signal;
  • a broadcasting TS generation unit comprising the multiplexing device according to the first aspect of the present invention, wherein a plurality of data including digital data and time information output from the encoding unit are multiplexed and output as a TS signal for broadcasting; , It is provided with.
  • the digital modulator of the third aspect of the present invention is An encoding unit that encodes and outputs a broadcast signal including at least one of a video signal and an audio signal;
  • a broadcasting TS generation unit comprising the multiplexing device according to the first aspect of the present invention, wherein a plurality of data including digital data and time information output from the encoding unit are multiplexed and output as a TS signal for broadcasting;
  • a modulation unit that modulates the TS signal output from the broadcast TS generation unit into a digital television broadcast signal of a predetermined broadcast channel; and It is provided with.
  • the independent broadcasting system of the fourth aspect of the present invention is: An encoding unit that encodes and outputs a broadcast signal including at least one of a video signal and an audio signal;
  • a broadcasting TS generation unit comprising the multiplexing device according to the first aspect of the present invention, wherein a plurality of data including digital data and time information output from the encoding unit are multiplexed and output as a TS signal for broadcasting;
  • a modulation unit that modulates the TS signal output from the broadcast TS generation unit into a digital television broadcast signal of a predetermined broadcast channel; and A receiving antenna for receiving digital TV broadcast waves;
  • a transmission cable for transmitting a digital television broadcast signal received by the receiving antenna to the terminal side;
  • a branching device provided in the transmission cable, for branching a digital television broadcast signal flowing in the transmission cable to the encoding unit;
  • a mixer provided in the transmission cable, for mixing the digital TV broadcast signal output from the modulation unit with the digital TV broadcast signal transmitted from the receiving antenna via the transmission cable, and outputting
  • the receiving unit selects and demodulates a predetermined channel from the digital television broadcast signal, thereby acquiring time information included in the signal of the channel.
  • the multiplexing unit multiplexes a plurality of input data including digital data obtained by encoding a broadcast signal including at least one of a video signal and an audio signal and time information acquired by the receiving unit. Are output as TS signals.
  • the receiving unit functions as a time server, and the TS signal for broadcasting can be generated using the time information obtained by the receiving unit.
  • the same time information as that of other digital television broadcast signals is included, and the time information included in the TS signal becomes inaccurate, and it is possible to suppress adverse effects on broadcast reception on the terminal side.
  • the receiving unit only needs to be able to acquire time information by selecting and demodulating a broadcast signal of a predetermined channel from digital TV broadcast signals. Therefore, the receiving unit includes a small and inexpensive digital such as a so-called one-segment tuner. A tuner can be used. Therefore, according to the encoder of the present invention, it is possible to reduce the size and cost of the apparatus.
  • the encoder according to the second aspect of the present invention includes, in addition to an encoding unit that encodes and outputs a broadcast signal including at least one of a video signal and an audio signal, the multiplexing apparatus according to the first aspect of the present invention.
  • a broadcast TS generation unit is provided.
  • the digital data obtained by encoding the broadcast signal by the encoding unit can be converted into a broadcast TS signal by the broadcast TS generation unit and output. it can.
  • the broadcast TS generator is composed of the multiplexing device of the first aspect of the present invention, the time information included in the TS signal becomes inaccurate, as in the first aspect of the present invention, It is possible to suppress adverse effects on broadcast reception on the terminal side.
  • an encoding unit and a broadcast TS generation unit including the multiplexing device according to the first aspect of the present invention are provided.
  • the modulation unit modulates the TS signal output from the broadcast TS generation unit into a digital television broadcast signal of a predetermined broadcast channel.
  • the digital modulator of the present invention it is not necessary to install each of the encoding unit, the broadcast TS generation unit, and the modulation unit separately as in the case where the encoding unit, the broadcast TS generation unit, and the modulation unit are configured separately. Can be installed.
  • a broadcasting TS generation unit comprising the encoding unit and the multiplexing device of the first aspect of the present invention.
  • a modulation unit, and a digital television broadcast signal transmitted to the terminal side via a transmission cable is branched by a branching unit and input to the broadcast TS generation unit.
  • the reception unit acquires time information from the input digital television broadcast signal, and the multiplexing unit includes the time information and output data from the encoding unit.
  • the input data is multiplexed to generate a TS signal for broadcasting.
  • the generated TS signal is modulated into a digital television broadcast signal of a predetermined broadcast channel by the modulation unit.
  • the digital television broadcast signal modulated by the modulation unit in this way is mixed with the digital television broadcast signal transmitted from the receiving antenna via the transmission cable via the mixer provided in the transmission cable, and then transmitted to the transmission cable. Is output to the terminal side via.
  • the TS signal generated by the broadcast TS generator includes time information extracted from the digital TV broadcast signal received by the receiving antenna, the time information becomes inaccurate, It is possible to suppress adverse effects on viewing and viewing of other digital television broadcasts.
  • a digital TV broadcast signal may be input from a transmission cable to a broadcast TS generation unit via a branching unit. Since it is not necessary to provide a receiving antenna or connect to an external network, the existing system can be modified to a digital broadcasting compatible side with a simple construction.
  • the digital TV broadcasting signal can be stably input to the broadcasting TS generator at an optimum level.
  • a stable TS signal is always output from the broadcast TS generation unit, and a stable digital television broadcast signal is output from the modulation unit. For this reason, according to the independent broadcasting system of the present invention, digital independent broadcasting can be carried out stably for a long period of time.
  • DESCRIPTION OF SYMBOLS 1 ... UHF antenna (reception antenna), 2 ... Amplifier, 3 ... Coaxial cable, 4 ... VHF antenna, 5 ... Broadcasting room, 6 ... Series unit, 10 ... Branch device, 11, 12 ... Coaxial cable, 15 ... Broadcast equipment, DESCRIPTION OF SYMBOLS 16 ... Signal cable, 17 ... Mixer, 18 ... Distributor, 20 ... Encoder, 21 ... Input terminal, 22 ... Reception part, 22a ... Channel selection part, 22b ... OFDM demodulation part, 22c ... Demultiplexing part, 23 ... Input terminal , 24 ... encoder, 25 ... multiplexer, 26 ... controller, 27 ... input terminal, 28 ...
  • multiplexer (broadcast TS generator), 29 ... output terminal, 30 ... OFDM modulator, 30a ... OFDM modulation 41: Distributor, 42: Digital tuner, 43: Analog TV, 45: Digital TV, 50: Analog modulator, 200: Digital modulator
  • the encoder 20 of the present embodiment includes a broadcast signal (for example, a video signal and / or an audio signal for independent broadcasting with SD image quality) input from a broadcasting device such as a video camera or a VTR, for example.
  • a broadcasting device such as a video camera or a VTR, for example.
  • a multiplexing device 28 as a broadcasting TS generation unit is provided to multiplex the encoded video / audio signal with other encoded data.
  • the digital TV broadcast TS signal (broadcast TS) can be output.
  • the encoder 20 adds the AV signal input from the input terminal 23 to the encoding unit 24 that outputs, for example, video / audio data (in this embodiment, MPEG-2 TS ⁇ ) digitized to HD image quality. Then, the video / audio data output from the encoding unit 24, time information described later, program guide data, and the like are received, and a multiplexing unit 25 that multiplexes each data to generate a broadcast TS, and the encoding unit 24 And a control unit 26 that controls the signal processing operation of the multiplexing unit 25 (for example, encoding, setting of parameters for multiplexing, generation of additional information such as time information to be multiplexed into video / audio data). Multiplexer 28 is provided.
  • video / audio data in this embodiment, MPEG-2 TS ⁇
  • the encoder 20 adds the AV signal input from the input terminal 23 to the encoding unit 24 that outputs, for example, video / audio data (in this embodiment, MPEG-2 TS ⁇ ) digitized to HD
  • the encoder 20 outputs the broadcast TS generated by the multiplexing unit 25 from the output terminal 29 to the outside.
  • the encoding unit 24 is configured to output, as an AV signal, HD quality material (video / audio signal) output from an HD recorder or the like as digitized video / audio data of HD quality. Also good.
  • the encoding unit 24 may encode one of the video signal and the audio signal. In that case, the multiplexing unit 25 generates a digital broadcast signal (broadcast TS) only for video or audio. Will be generated.
  • broadcast TS digital broadcast signal
  • the multiplexer 28 receives from the input terminal 21 a digital television broadcast signal RF1 (received signal) transmitted via a coaxial cable from the UHF antenna 1 (see FIG. 3) that receives the digital television broadcast wave.
  • a receiving unit 22 is provided for acquiring digital information included in the signal of the channel by selecting and demodulating a predetermined channel from the digital television broadcast signal RF1.
  • the radio wave received by the receiving antenna is terrestrial digital broadcast
  • the received signal transmitted via the coaxial cable is a digital television broadcast signal
  • the receiving unit 22 includes a channel selection unit 22a that selects a predetermined channel from the digital television broadcast signal RF1 input through the input terminal 21, and an OFDM demodulation unit 22b that demodulates the digital TV broadcast signal of the channel.
  • the OFDM demodulator 22b includes a demultiplexer 22c that separates the TS signal after error correction of the TS signal demodulated. Note that the channel selection channel of the receiving unit 22 is controlled by the control unit 26.
  • the reason why the receiving unit 22 is provided in the multiplexer 28 is that time information (TOT) that is essential for a TS signal for broadcasting (broadcast TS) generated for independent broadcasting when performing independent broadcasting with a digital TV broadcasting signal. Is to get.
  • TOT time information
  • the multiplexing device 28 is provided with a receiving unit 22 as a time server, and the receiving unit 22 separates time information (TOT) from digital information of a predetermined channel.
  • the time information obtained by the receiving unit 22 is output to the control unit 26.
  • control unit 26 sets its own RTC (Real Time Clock) using this time information and multiplexes the time information together with other additional information such as program guide information as a broadcast TS. To the multiplexed data and output to the multiplexing unit 25.
  • RTC Real Time Clock
  • the multiplexing unit 25 generates a broadcast TS in which the video / audio data generated by the encoding unit 24 and various additional information such as time information and program guide information are multiplexed.
  • the broadcast TS is output from the output terminal 29 of the encoder 20 to the outside.
  • control unit 26 converts into multiplexed data together with time information, a channel selection channel of the reception unit 22 controlled by the control unit 26, or an encoding unit 24 set by the control unit 26.
  • the parameters of the multiplexing unit 25 are connected to the control unit 26 by an information processing device such as a personal computer (external PC shown in the figure) so that the user can set the parameters appropriately using this information processing device. ing.
  • the receiving unit 22 it is preferable to use a tuner corresponding to a one-segment partial reception service for receiving terrestrial digital broadcasting (so-called one-segment tuner). That is, since this tuner is inexpensive and small in size, the cost can be reduced and the size of the encoder 20 can be reduced by adopting the tuner as a time server.
  • the encoder 20 of the present embodiment can be used in the digital independent broadcasting system shown in FIG.
  • an independent broadcasting system constructed using the encoder 20 of the present embodiment will be described with reference to FIG.
  • the self-broadcasting system of this embodiment includes a UHF antenna 1 for receiving a digital terrestrial broadcast wave as a receiving antenna.
  • the coaxial cable 3 connected to the UHF antenna 1 is drawn into a broadcasting room 5 provided in the building.
  • the coaxial cable 3 is drawn from the broadcasting room 5 and then connected to the distributor 18 and distributed to a predetermined number.
  • Each coaxial cable 3 connected to the distribution terminal of the distributor 18 A system for receiving television broadcasts is configured by being drawn to the terminal.
  • the digital television broadcast signal RF1 transmitted from the UHF antenna 1 is amplified by a predetermined amount by an amplifier 2 that amplifies a UHF band television broadcast signal. It is drawn into the broadcast room 5 through the coaxial cable 3.
  • a branching device 10 is provided in the coaxial cable 3, and a part of the digital television broadcast signal RF ⁇ b> 1 transmitted through the coaxial cable 3 is output from the branching terminal 10 a of the branching device 10.
  • An encoder 20 is provided in the broadcast room 5, and the digital television broadcast signal RF 1 output from the branch terminal 10 a of the branching device 10 is input from the input terminal 21 to the encoder 20 via the coaxial cable 11. .
  • an SD signal AV signal (audio / video signal) generated by the broadcasting device 15 composed of a VTR or the like is input to the input terminal for AV signal input of the encoder 20 via the signal cable 16.
  • the receiving unit 22 extracts time information (TOT) from the digital television broadcast signal RF 1 input from the input terminal 21, and the encoding unit 24 uses the digital broadcast broadcast signal RF 1 for digital broadcasting.
  • Video / audio data is generated, and the multiplexing unit 25 generates a broadcast TS for digital broadcasting in which the video / audio data and additional information such as time information (TOT) are multiplexed.
  • the generated broadcast TS Is output from the output terminal 29.
  • the broadcast room 5 is provided with an OFDM modulator 30 for converting a broadcast TS output from the output terminal 29 of the encoder 20 into a digital TV broadcast signal RF2 of a predetermined channel set in advance.
  • the digital television broadcast signal RF2 generated by the OFDM modulator 30 is input to the mixer 17 via the coaxial cable 12.
  • the mixer 17 is provided on the coaxial cable 3 between the branching device 10 and the distributor 18, and the digital television broadcast signal RF ⁇ b> 2 generated by the OFDM modulator 30 and the UHF antenna via the coaxial cable 3. 1 is mixed with the received signal (digital television broadcast signal RF1) transmitted from 1 and outputted onto the coaxial cable 3 on the terminal side.
  • the mixed signal output from the mixer 17 onto the coaxial cable 3 on the terminal side is distributed by the distributor 18, and then the series unit 6 on the coaxial cable 3 connected to each distribution terminal of the distributor 18. Are output to various terminal devices.
  • both the digital terrestrial broadcast and the digital independent broadcast can be viewed using the digital compatible TV 45.
  • the branching device 10 is provided in the coaxial cable 3 that has already been drawn into the broadcasting room 5.
  • the analog modulator 50 By simply replacing the analog modulator 50 with the encoder 20 and the OFDM modulator 30, it is possible to perform independent broadcasting using digital television broadcast signals using the coaxial cable 3 that has already been wired. For this reason, a digital independent broadcasting system can be realized easily and at low cost.
  • the digital television broadcast signal RF1 received by the UHF antenna 1 may be input to the encoder 20 of the present embodiment via the branching device 10, the reception unit 22 is used in the encoder 20, Time information can be acquired stably and continuously.
  • the time information in the broadcast TS output from the encoder 20 is the same as the time information included in the terrestrial digital broadcast signal received by the UHF antenna 1, so that the self-broadcast generated by the OFDM modulator 30 is used.
  • the accuracy of the time information included in the digital TV broadcast signal is not deteriorated.
  • the self-broadcasting system of the present embodiment it is possible to suppress the occurrence of problems such as poor reception on the terminal side due to a decrease in the accuracy of the time information included in the digital TV broadcast signal for self-broadcasting.
  • the encoder 20 and the OFDM modulator 30 are individually provided in the broadcasting room 5.
  • the encoder 20 shown in FIG. 2 may be configured by providing the OFDM modulation unit 30 a therein, and the digital modulator 200 may be installed in the broadcast room 5.
  • the encoder 20 and the digital modulator 200 are multiplexed data (for example, encoded by other encoding devices) to be multiplexed as a digital television broadcast signal for independent broadcasting from the outside.
  • An input terminal 27 for inputting converted video / audio data) may be provided.
  • the multiplexing device 28 as the broadcast TS generating unit can be configured separately from the encoding unit 24, but in this case, the multiplexing data (video / audio data) to the multiplexing device 28 is used. Etc.) may be provided, and multiplexing data input to each input terminal may be input to the multiplexing unit 25.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)

Abstract

Le dispositif de multiplexage selon l'invention comporte : une section de réception qui reçoit des signaux de diffusion de télévision numérique et qui sélectionne et démodule un canal prédéterminé parmi les signaux de diffusion de télévision numérique pour acquérir ainsi des informations d'heure comprises dans le signal dudit canal ; et une section de multiplexage qui multiplexe une pluralité de parties de données et qui produit les données multiplexées sous forme de signal TS de diffusion, les parties de données à multiplexer comprenant lesdites informations d'heure, lesquelles ont été acquises par la section de réception, et des données numériques encodées qui sont créées en encodant un signal de diffusion comprenant un signal audio et/ou un signal vidéo.
PCT/JP2011/054361 2010-02-25 2011-02-25 Dispositif de multiplexage, encodeur modulateur numérique et système de diffusion autonome WO2011105569A1 (fr)

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US9379928B2 (en) * 2013-11-17 2016-06-28 Lg Electronics Inc. Apparatus for transmitting broadcast signals, apparatus for receiving broadcast signals, method for transmitting broadcast signals and method for receiving broadcast signals
JP6377387B2 (ja) * 2014-03-31 2018-08-22 マスプロ電工株式会社 多重化装置及びデジタル変調器

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