JP2010219907A - Digital broadcast receiver and receiving method, and transmitter and transmission method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a device capable of interpolating an interpolation frame in a frame of a motion picture image without generating an interpolation frame to be interpolated between frames of the motion picture image at the receiver side. <P>SOLUTION: A digital broadcast receiver receives an airwave multiplexing a stream of a main service including a data packet of video picture data including a first PCR (Program Clock Reference), and a stream of a sub-service including a data packet of video picture data including a second PCR shifted from the first PCR, separates the data packet of the main service and the data packet of the sub-service from an airwave, decodes the data packet of the separated main service to output video picture data having the first PCR, decodes the data packet of the separated sub-service to output the video picture data having the second PCR, and alternately outputs the video picture data having the first PCR and the video picture data having the second PCR according to the order of the PCR. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a digital broadcast receiver, a reception method, a transmitter, and a transmission method, and more particularly to a technique that enables reception of broadcast radio waves in which a plurality of services are multiplexed on one physical channel.

  In recent years, the one-segment partial reception service “One Seg” of digital terrestrial broadcasting for mobiles started on April 1, 2006 has become widespread. Since clear images can be received even when moving, not only mobile phones but also portable TVs, car navigation systems, notebook PCs, portable game machines, USB connection type tuners, etc. are widely used.

  One Seg is strong in mobile reception because of digital broadcasting, but has a weak point that it cannot be smoothly played back with a fast moving picture such as sports because the frame rate is 15 fps.

  As a technique for solving this problem, there is a method of smoothing a moving image by generating an interpolation frame on the receiver side and interpolating the interpolation frame between frames of moving images (see Patent Document 1).

JP 2008-2444846 A

As in Patent Document 1, it is not easy to generate an interpolation frame that is interpolated between frames of a moving image on the receiver side.
Accordingly, the present invention provides a digital broadcast receiver and a receiving method capable of interpolating an interpolated frame into a moving image frame without generating an interpolated frame to be interpolated between the frames of the moving image at the receiver side. An object of the present invention is to provide a transmitter and a transmission method.

  The digital broadcast receiver according to the present invention includes a main service stream including a data packet of video data having a first PCR, and a second time shifted from the first PCR by half the frame rate of the video data. Receiving means for receiving a broadcast radio wave multiplexed with a sub-service stream including a data packet of the video data having PCR; and separating the main service data packet and the sub-service data packet from the broadcast radio wave A first demultiplexer that decodes the separated main service data packet and outputs the video data having the first PCR, and decodes the separated sub service data packet to the first A second decoding unit for outputting the video data having two PCRs; A video frame synthesizing unit that alternately outputs the video data having the first PCR and the video data having the second PCR according to the order of the first and second PCRs. Features.

  The digital broadcast receiving method according to the present invention includes a main service stream including a data packet of video data having a first PCR, and a second time shifted from the first PCR by a half of the frame rate of the video data. Receiving a broadcast radio wave multiplexed with a sub-service stream including a data packet of the video data having a PCR, separating the main service data packet and the sub-service data packet from the broadcast radio wave, and separating The main service data packet is decoded to output the video data having the first PCR, and the separated sub service data packet is decoded to output the video data having the second PCR. And outputting the video data having the first PCR and the second PCR. And said video data, and outputs alternately in the order of the first and second PCR.

  The digital broadcast transmitter according to the present invention includes a means for generating a main service stream including a data packet of video data having a first PCR, and a first PCR having a data packet of video data of the main service stream. Means for adjusting a second PCR by shifting by half the frame rate interval of the video data to generate a sub-service stream including a data packet of the video data having the second PCR, and the main service And a multiplexer that multiplexes each stream of the sub-service into one physical channel, and a transmission unit that generates and transmits a broadcast radio wave from the multiplexed stream.

A digital broadcast transmission method according to the present invention generates a main service stream including a data packet of video data having a first PCR, and the first PCR of the data packet of video data of the main service stream is converted to the video data. The second PCR is adjusted by shifting by a half of the frame rate interval of the frame to generate a subservice stream including the data packet of the video data having the second PCR, and the main service and the subservice Each stream is multiplexed on one physical channel, and broadcast radio waves are generated from the multiplexed stream and transmitted.
A digital broadcast transmission / reception system according to the present invention includes the digital broadcast receiver and the digital broadcast transmitter.

  According to the present invention, the video data of the main service and the sub service each have a PCR shifted by a predetermined time, and the video data of the main service and the video data of the sub service are alternately output by managing in the PCR order, It is possible to interpolate an interpolation frame into a moving image frame without generating an interpolation frame to be inserted between moving image frames on the receiver side.

It is a system configuration example of the digital broadcast transmitter of the present invention. 1 is a system configuration example of a digital broadcast receiver according to the present invention. 6 is a flow of processing for doubling the video frame rate in the digital broadcast receiver of the present invention.

Hereinafter, embodiments of the present invention will be described in detail.
FIG. 1 shows a digital broadcast transmitter used corresponding to the digital broadcast receiver of the present invention. The transmitter 10 includes an audio stream generation unit 101, a video stream generation unit 102, a subtitle stream generation unit 103, a time adjustment unit 104, a multiplexer 105, a stream transmission unit 106, and an antenna 107.

  The audio stream generation unit 101, the video stream generation unit 102, and the subtitle stream generation unit 103 add a presentation time (PTS) to each data packet of the generated audio data, video data, and subtitle data, and generate a main service stream. Output. The main service provides programs for general viewers.

The time adjustment unit 104 converts a PCR (Program Clock Reference), which is a reference clock included in the data packet of the main service stream output from the audio stream generation unit 101, the video stream generation unit 102, and the subtitle stream generation unit 103, into a time D It adjusts so that it may shift | deviate only, and produces | generates the stream of a subservice. Here, “time D” is half the frame rate interval of the video stream. The PCR is adjusted such that when the sub service stream is presented by the receiver, the presentation time is PTS + D.
Accordingly, if the main service stream includes a data packet of video data having the first PCR, the sub service stream includes a data packet of video data having the second PCR. The second PCR is shifted from the first PCR by half the frame rate interval of the video data.
Since the time difference between the main service and the sub service is half of the frame rate interval, a receiver that does not have a function to improve the frame rate can be handled as if the main service and the sub service are simultaneously broadcasting.

  The multiplexer 105 multiplexes each stream of the main service and the sub service into one physical channel. The stream transmission unit 106 modulates the stream multiplexed by the multiplexer 105 to generate broadcast radio waves. The generated broadcast radio wave is output from the antenna 107.

  FIG. 2 is a configuration example of a digital broadcast receiver that implements the present invention. The receiver 20 includes an antenna 201, a tuner 202, a demultiplexer 203, a first decoding unit 204, a second decoding unit 205, and a video frame synthesis unit 206. Note that the decoding unit can be provided for the number of services.

  FIG. 3 shows a flow of processing for combining the main service and the sub service and changing the frame rate of the main service from 15 fps to 30 fps in the digital broadcast receiver of the present invention shown in FIG.

  The digital broadcast transmitter in FIG. 1 outputs video data at 15 fps in the main service, and video data obtained by shifting the PCR by 1/15/2 seconds from the main service at 15 fps in the sub service.

  The tuner 202 extracts a data packet from the broadcast radio wave received by the antenna 201 (301). The demultiplexer 203 separates the data packet extracted by the tuner 202 into a main service and a sub service (302). The data packet of each service is separated into audio data, video data and caption data (303).

  The first decoding unit 204 decodes the main service stream separated by the demultiplexer 203 (304), and outputs video, audio, and subtitle data (305). The video data of the main service has the first PCR. The second decoding unit 205 decodes the sub service stream separated by the demultiplexer 203 (306), and outputs video, audio, and subtitle data (307). The video data of the sub service has a second PCR.

  The video frame synthesizing unit 206 alternately outputs the video data of the main service and the sub service decoded by the first decoding unit 204 and the second decoding unit 205 in accordance with the first and second PCRs (308). 309). The method of alternately outputting is performed by managing in the order of PCR. Since the second PCR is shifted by half the frame rate interval from the first PCR, it can be handled as one service without being aware of the main service and the sub service by managing in the PCR order. Each data of audio and subtitles is output in accordance with the PCR of the main service (310).

  According to the above method, by alternately outputting the video data of the main service and the sub service, the interpolation frame is inserted into the moving image frame without generating the interpolation frame to be interpolated between the moving image frames on the receiver side. Can be interpolated.

DESCRIPTION OF SYMBOLS 10 ... Digital broadcast transmitter, 101 ... Audio stream production | generation part, 102 ... Video stream production | generation part, 103 ... Subtitle stream production | generation part, 104 ... Time adjustment part, 105 ... Multiplexer, 106: Stream sending unit 107: Antenna 20 Digital broadcast receiver 201 ... Antenna 202 ... Tuner 203 ... Demultiplexer 204 ... First decoding unit 205 ..Second decoding unit, 206 ... video frame synthesis unit

Claims (5)

The main service stream including the data packet of the video data having the first PCR, and the data of the video data having the second PCR shifted from the first PCR by half the frame rate interval of the video data Receiving means for receiving broadcast radio waves multiplexed with sub service streams including packets;
A demultiplexer that separates the data packet of the main service and the data packet of the sub service from the broadcast radio wave;
A first decoding unit for decoding the separated main service data packet and outputting the video data having the first PCR;
A second decoding unit for decoding the separated sub-service data packet and outputting the video data having the second PCR;
A video frame synthesizing unit that alternately outputs the output video data having the first PCR and the video data having the second PCR in the order of the first and second PCRs; A digital broadcast receiver. The main service stream including the data packet of the video data having the first PCR, and the data of the video data having the second PCR shifted from the first PCR by half the frame rate interval of the video data Receives broadcast radio waves that are multiplexed with sub-service streams including packets,
Separating the data packet of the main service and the data packet of the sub service from the broadcast radio wave,
Decoding the separated main service data packet to output the video data having the first PCR,
Decoding the separated sub-service data packet to output the video data having the second PCR;
Digital broadcast reception characterized by alternately outputting the output video data having the first PCR and the video data having the second PCR in the order of the first and second PCRs Method. Means for generating a stream of a main service including a data packet of video data having a first PCR;
The video having the second PCR by adjusting the second PCR by shifting the first PCR of the data packet of the video data of the main service stream by half the frame rate interval of the video data Means for generating a stream of subservices including data packets of data;
A multiplexer that multiplexes each stream of the main service and the sub-service into one physical channel;
Transmitting means for generating and transmitting broadcast radio waves from the multiplexed stream. Generating a main service stream including a data packet of video data having a first PCR;
The video data having the second PCR by adjusting the second PCR by shifting the first PCR of the data packet of the video data of the main service stream by half the frame rate interval of the video data A stream of subservices containing data packets of
The streams of the main service and the sub service are multiplexed on one physical channel,
A digital broadcast transmission method, wherein a broadcast radio wave is generated from the multiplexed stream and transmitted. A digital broadcast transmission / reception system comprising the digital broadcast receiver according to claim 1 and the digital broadcast transmitter according to claim 3.

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