JP2009212710A - On-board electronic device and recording and reproducing method thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an on-board electronic device which can shorten a time until recorded content data are reproduced and efficiently utilize a mounted hardware source, and to provide a recording and reproducing method thereof. <P>SOLUTION: The on-board electronic device 2 includes: a TS decoder 40 to extract data for reproduction by decoding identification data of content data; an MPEG decoder 50A to decode the data for reproduction extracted by the TS decoder 40; a recoding device 80 to record the content data; a TS multiplexing section 110 to multiplex a plurality of content data recorded in the recording device 80; and a controller 100A to control the reproduction of the multiplexed content data. The controller 100A extracts AV data of the respective content data from the multiplexed content data, and outputs the selected AV data from the MPEG decoder 50A. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an electronic apparatus having a function of recording and reproducing digital content data obtained from terrestrial digital television broadcasting and other media, and more particularly to a technique for multiplexing and recording digital content data.

  Terrestrial digital broadcasting has a structure in which one channel is divided into 13 segments. 12 segments are assigned to high-definition broadcasting, and 4 segments are assigned to normal-quality broadcasting. In addition, for mobile mobile terminals such as mobile phones, since the screen is small and the resolution is low, low-resolution broadcasting (hereinafter referred to as one-segment broadcasting) in which only one segment is allocated is performed.

In Patent Document 1, when recording a video program, electronic program information including a program genre and a broadcast time is recorded together, and a classification number (for example, a drama classification) is added to the recording information according to the contents of the electronic program information. Number 1 and news classification number 2). As a result, the user can easily estimate the contents of the recording information from the classification number.
International publication WO 00/02386

  In-vehicle electronic devices are equipped with functions for receiving television and radio broadcasts, reproducing multimedia data, and recording these data in addition to the navigation function. Unlike the fixed recording / playback device for home use, such an in-vehicle electronic device does not have a recording function to a large-capacity medium such as a large-capacity hard disk drive (hereinafter referred to as HDD) or a Blu-ray disc. It is difficult to record high-definition video. For this reason, one-segment program recording has become the mainstream for recording on-vehicle electronic devices.

  FIG. 10 is a block diagram showing a configuration of a conventional in-vehicle electronic device. The in-vehicle electronic device 1 demodulates and digitizes the four antennas 10, the four tuners 20 that receive the terrestrial broadcast received by the four antennas, and the intermediate frequency signal IF received by the tuner 20. An OFDM demodulator 30 that generates a transport stream TS, a TS decoder 40 that decodes a header portion included in the transport stream TS and extracts AV (audio, video) data, and AV data extracted by the TS decoder 40 MPEG decoder 50 that decodes AV data and reproduces video and audio, a display 60 such as a liquid crystal display that displays the video data decoded by MPEG decoder 50, and a speaker that outputs the decoded audio data 70 and extracted by TS decoder 40 A recording device 80 such as HDD for recording content data, the user input 90 for receiving an input from a user, and a controller 100 for controlling each section. The controller 100 controls the demodulator 30, the TS decoder 40, and the storage device 80 via control signals S1, S2, and S3, respectively.

  Playback and recording in the in-vehicle electronic device are performed as follows. The vehicle-mounted electronic device 10 is turned on, and a program (or content) selection is input from the user input 90. The controller 100 outputs a control signal S2 corresponding to the selection of the program to the TS decoder 40, and the TS decoder 40 extracts AV data of the corresponding program from the transport stream TS according to the analysis of the header portion based on the control signal S2. . The extracted AV data is output as video and audio via the MPEG decoder 50.

  When a program recording instruction is input from the user input 90, the controller 100 outputs a control signal S2 to the TS decoder 40, and the TS decoder 40 extracts content data of the recorded program based on the control signal S2, and the recording device. 80 records the content data extracted in accordance with the instruction of the control signal S3. For recording, one seg is made partial from the selected channel and stored in the recording device 80.

  FIG. 11 is an operation flow when reproducing content data recorded by the in-vehicle electronic device. The on-vehicle electronic device 10 is turned on (step S1), and a recorded program (or content) to be played is selected from the user input 90 (step S2). In response to this, the TS supports the coder 40. Content data to be input is input from the recording device 80 (step S3). The TS decoder 40 extracts AV data and outputs them to the MPEG decoder 50 (step S4). The AV data is decoded by the MPEG decoder (step S5), and the recorded program is provided to the user (step S6). When a recorded program or content is switched from the user input 90 (step S7), the controller 100 selects content data corresponding to the recorded content from the recording device 80, and outputs the selected content data to the TS decoder 40 for playback. Is called.

  As described above, in the conventional recording / playback method, when switching the recorded content, the content data must be read from the recording device 80 and processed by the TS decoder 40 each time. Since the digital signal processing by the TS decoder 40 takes a certain time, it takes time to reproduce the switched recorded program. In particular, when there is a large amount of content, there is a problem that stress increases in zapping.

  In addition, since the in-vehicle electronic device supports full-segment digital terrestrial broadcasting, the TS decoder 40 and MPEG decoder 50 are often shrunk with high-end chips for fixed receivers, and recording one-segment broadcasting. And the use of only playback has a considerable margin in processing power, i.e., their performance is not fully and effectively utilized.

  The present invention solves the above-described conventional problems, shortens the time until the recorded content data is played back, and can effectively use the installed hardware resources, and the recording and playback thereof. It aims to provide a method.

  An electronic apparatus according to the present invention has a function of reproducing and recording content data, and inputs encoded content data including identification data for identifying reproduction data and the reproduction data, and the identification Extraction means for extracting reproduction data by decoding the data; decoding means for decoding the reproduction data extracted by the extraction means; output means for outputting the decoded reproduction data; Recording means for recording content data including reproduction data extracted by the extracting means and identification data corresponding thereto, and multiplexing a plurality of content data selected from the plurality of content data recorded in the recording means Creating multiplexed multiplexed content data and recording the multiplexed content data on the recording unit; and the multiplexing Control means for controlling reproduction of content data, wherein the control means causes the extraction means to extract reproduction data of each content data from the multiplexed content data, and the control means includes each reproduction data The decoding means for decoding is made to output the selected reproduction data.

  Preferably, the multiplexing means multiplexes identification data of a plurality of content data. The electronic device further includes receiving means for receiving terrestrial digital broadcasting, and the extracting means can input a data stream output from the receiving means as the content data. Preferably, the recording unit records content data of a specific segment included in the data stream.

  Preferably, the control means selects reproduction data output from the decoding means in response to a user input. Preferably, the decoding means continuously decodes each reproduction data. Preferably, the electronic device further includes data transfer means for transferring the multiplexed content data recorded in the recording means to the outside.

  According to the present invention, a method for recording and reproducing content data in an in-vehicle electronic device inputs encoded content data including reproduction data and identification data for identifying the reproduction data, and decodes the identification data. A step of extracting reproduction data, a step of recording content data including the extracted reproduction data and identification data corresponding to the extracted reproduction data, and a plurality of content data among the plurality of recorded content data. Selecting, creating multiplexed content data obtained by multiplexing a plurality of content data, recording the multiplexed content data, decoding the identification data of the multiplexed content data, and a plurality of content data included in the multiplexed content data Extracting a plurality of playback data from the content data, It has a step of reproducing a plurality of reproduction data, and outputting the reproduction data selected from a plurality of reproduction data reproduced.

  According to the present invention, the content data is multiplexed and recorded, and the recorded multiplexed content data is reproduced. Therefore, if the content in the multiplexed content data is switched, compared to the conventional case. The time until reproduction can be shortened, and the stress caused by zapping can be alleviated.

  The best mode for carrying out the present invention will be described in detail with reference to the drawings. Here, an in-vehicle electronic device equipped with a navigation function and a reception function for terrestrial digital broadcasting is used as an example, but the electronic device of the present invention is not necessarily limited to such an aspect.

  FIG. 1 is a block diagram showing the configuration of an in-vehicle electronic device according to an embodiment of the present invention. The same components as those in FIG. 10 used in the conventional description are given the same reference numerals. The on-vehicle electronic device 2 according to the present embodiment demodulates four tuners 20 that receive terrestrial digital broadcasts from four antennas 10 and an intermediate frequency carrier wave (IF), and demodulates them into the original encoded digital signals. An orthogonal frequency division multiplexing demodulator (hereinafter referred to as an OFDM demodulator) 30 and a transport stream (hereinafter referred to as TS) output from the OFDM demodulator 30 are input, and a header portion including TS identification data is decoded. TS decoder 40, AV (audio and video) data separated or extracted by TS decoder 40, MPEG decoder 50A for decoding AV data and reproducing video data and audio data, display 60, speaker 70, TS TS content data and multiplexed content data from the decoder 40 Recording device 80 for recording, user input 90, TS content data multiplexed from TS content data recorded in recording device 80, TS multiplexing unit 110 for recording this in recording device 80, multiplexed content A data output 120 for transferring data to an external device and a controller 100A for controlling each unit are included.

  The controller 100A supplies the control signals S1, S2, and S3 to the demodulator 30, the TS decoder 40, and the recording device 80 in the same manner as in the prior art. To the unit 110. As will be described later, when the TS decoder 40 decodes the multiplexed content data, the MPEG decoder 50A simultaneously reproduces the multiplexed AV data of the multiplexed content data, but responds to the control signal S4 from the controller 100A. The selected AV data is output.

  FIG. 2 is a diagram for explaining the data structure of the TS. TS, which is one of the multiplexed signals, is used as a multiplexed signal for terrestrial digital broadcasting, and individual streams such as video, audio, and data broadcasting can be used in a common signal format regardless of the type of application or transmission path. It can be transmitted as a single stream.

  TS200 is a continuous signal sequence of TS packets 210 divided by a fixed length of 188 bytes. The TS packet 210 includes a header part 220 and a data part 230. The header section 220 includes an identification section 222 that stores an ID for identifying a TS packet (hereinafter referred to as TS_id), an electronic program guide (hereinafter referred to as an EPG), and the like, and each PID and program included in the TS packet. A program association table (hereinafter referred to as PAT) 224 indicating a storage destination by Service_id, and a program map table (hereinafter referred to as PMT) 226 which is a storage destination of various elementary storms (hereinafter referred to as ES) included in the TS packet. including.

  Video data, audio data, and other data are transmitted as TS packets each having a unique PID. Even if a plurality of TS packets are mixed in one TS, the type and output of each TS packet is determined by information in the header section 220. The order can be determined. The data unit 230 includes a video ES232 that is video data, an audio ES234 that is audio data, and other data ES236.

  The TS decoder 40 extracts a TS packet 210 from the TS data stream 200 demodulated by the OFDM demodulator 30, and uses a demultiplexer (hereinafter referred to as DMUX) to store the TS packet attribute information in the header section 220. The video data, the audio data, and the data broadcasting information itself are divided into the data section 230 and output. Further, the TS decoder 40 decodes the header part 220 and outputs the video and audio AV data of the TS packet to the MPEG decoder 50A. At the time of recording, the decoded TS content data is output to the recording device 80.

  FIG. 3 is a block diagram showing an internal configuration of the TS multiplexing unit 110. The TS multiplexing unit 110 creates a TS header data selection unit 112 that selects a plurality of TS content data from the recording device 80, and creates a multiplexing header unit common to the selected plurality of TS content data. A multiplexed content data creation unit 114 that multiplexes the TS content data selected by the above, and a recording unit 116 that records the multiplexed content data created by the multiplexed content data creation unit 114 in the multiplexed content data recording device 80; have.

  The multiplexed content data creation unit 114 creates a header portion shared by TS content data (packets). Further, as described later, the header part may share all of the identification parts TS222, PAT224, and PMT226, or may share a part thereof.

  The TS content data selection unit 112 preferably selects TS content data based on the control signal S5 of the controller 100A. For example, the TS content data selection unit 112 searches the recording device 80 for TS content data that the user desires to multiplex by the user input 90 and selects the corresponding TS content data. In addition, the TS content data selection unit 112 selects TS content data having a common program name, the performer selects TS content data of a common program, or TS content data recorded within a certain period. TS content data can be selected according to the recorded order. Preferably, the TS content data selection unit 112 multiplexes a number of TS content data according to the processing capability of the TS decoder 40.

  Next, a specific example of content data multiplexed according to the present embodiment is shown in FIG. 4, and a specific example of content data recorded in a conventional recording apparatus is shown in FIG. Here, in order to make the explanation easy to understand, three TS content data are used as an example. As shown in FIG. 5, TS content data A, B, and C each have a separate header part and data part.

  In the header portion 220 of the TS content data A, “TS_id = 01” is stored in the identification unit 222, “Service_id = 1001” is stored in the PAT 224, and the packet identifier (hereinafter referred to as the packet identifier) of the video ES is stored in the PMT 226. "0x0101" for the video ES_PID), "0x0201" for the packet identifier of the audio ES (hereinafter referred to as audio ES_PID), "0x001" for the packet identifier of the data broadcast ES (referred to as data ES_PID), video ES, audio “0x0401” is stored in the packet identifier (hereinafter referred to as PCR_PID) of the PCR that associates the ES with the data broadcast ES. The data part 230 stores a video ES 232, an audio ES 234, and data ES 236 corresponding to the PID stored in the PMT of the header part. The same applies to the other TS content data B and C.

  On the other hand, the multiplexed content data M according to the present embodiment, as shown in FIG. 4, is a common identification associated with TS_id = 01, 02, 03 held by the identification unit 222 of the TS content data A, B, C. In section 300, TS_id = 04 is created. The common identification unit 300 can identify the TS content data A, B, and C. In other words, the multiplexed content data M includes TS content data A, B, and C as a group. The above-described multiplexed content data creation unit 114 multiplexes TS content data by creating such a common identification unit. The configuration of the header part and the data part other than the identification part is the same as that shown in FIG.

  Next, the reproduction operation of the recorded content data in the in-vehicle electronic device of this embodiment will be described with reference to the flowchart shown in FIG. First, the power source of the in-vehicle electronic device 10 is turned on (step S101), and a recorded program (or content) to be reproduced is selected from the user input 90 (step S102). Here, it is assumed that the user has instructed playback of TS content data A (see FIG. 4).

  The controller 100A searches the TS content data A via the control signal S3, and outputs the content data M obtained by multiplexing the TS content data A from the recording device 80 to the TS decoder 40. When receiving the multiplexed content data M (step S103), the TS decoder 40 decodes the common identification unit 300 of the multiplexed content data M. As a result, the TS content data A, B, and C are identified, and the AV data included in the content data A, B, and C is separated by decoding the header portions of the TS content data A, B, and C. The separated AV data is output to the MPEG decoder 50A (step S104).

  The MPEG decoder 50A decodes the AV data output from the TS decoder 40 and separates it into video data and audio data (step S105). What is important is that the MPEG decoder 50 reproduces each AV data of the TS content data A, B, and C simultaneously. The controller 100A informs the MPEG decoder 50A by the control signal S4 that the TS content data A is selected, whereby the MPEG decoder 50A outputs the video data and audio data reproduced for the content data A, and the content Video data and audio data reproduced for data B and C are not output.

  The recorded program selected by the display 60 and the speaker 70 is provided to the user (step S106). When a recorded program or content is switched from the user input 90 (step S107), the controller 100A informs the MPEG decoder 50A of the switching of the content via the control signal S4, and the MPEG decoder 50A detects the switched content data. The video data and audio data being reproduced are output (step S108). For example, when there is a user input for switching from content data A to B, the MPEG decoder 50A switches the output to video data and audio data of the content data B.

  As described above, in this embodiment, the multiplexed content data is processed by the TS decoder and the AV data is processed by the MPEG decoder 50A. Therefore, when switching the content to be recorded and reproduced, the output of the MPEG decoder 50A is output. The content can be immediately played back and output simply by switching. For this reason, it is possible to significantly reduce the time until playback compared to conventional recording and playback.

  Further, the TS decoder 40 needs to store the program name and program information obtained by decoding the content data in the nonvolatile memory. However, as in the present embodiment, if it is multiplexed content data, Since all the content data contained therein can be managed and the program name and program content can be collectively displayed using the EPG function, the capacity of the nonvolatile memory can be reduced.

  Next, the movement of multiplexed content data from the in-vehicle electronic device will be described. The controller 100A can move the stored content data to other external devices. Preferably, the data output 120 conforms to IEEE 1394 (iLink) and has a transfer mode of 100 Mbps, 200 Mbps, or 400 Mbps. When TS content data is sequentially and sequentially transferred from the recording device 80, even if there is a 400 Mbps transfer mode, it cannot be fully utilized, and as a result, the movement time of the content data becomes long. For example, encoding of high-definition TS content data is about 20 Mbps at the maximum, and is much smaller than 400 Mbps in the maximum transfer mode. In this embodiment, by moving the multiplexed content data, a large amount of content data can be moved to other external devices efficiently and in a short time. For example, if the content data is 20 Mbps as in the above example, approximately 20 pieces of content data can be multiplexed and moved at a time. Thus, by multiplexing and transmitting TSs, it is possible to effectively use the band, and it is possible to relatively improve the speed when transmitting a plurality of contents.

  Next, another example of multiplexing of content data will be described. In the multiplexing example shown in FIG. 7, in addition to sharing the identification unit 300, the PAT and the PMT are shared. First, the TS multiplexing unit 110 selects three TS content data A and BC (TS_id = 01, 02, 03), creates a new common identification unit 300 (TS_id = 04), and further lower layers A common PAT 310 (Service_id = 1004) is created by integrating the three PATs, and a common PMT 320 is created by integrating the three lower PMTs.

  Service_id = 1004 is associated with Service_id = 1001, 1002, 1003, and each Service_id = 1001, 1002, 1003 has the video ES_PID, audio ES_PID, and data ES_PID shown in FIG. 4, respectively. That is, the PID information of the video ES, the audio ES, and the data ES included in the three TS content data A, B, and C is written in the PMT 320, and a PCR program (PCR_PID = 0x0404) that associates these ESs is created. .

  FIG. 8 is a diagram illustrating another example of multiplexing. In this example, in addition to the example shown in FIG. 7, the video ES, audio ES, and data ES in the data portion are grouped into groups 330, 340, and 350, respectively. This example uses a multi-view television (MVTV) system. In MVTV, ESs grouped by “component_group_descriptor” of EIT [p / f] can be switched in conjunction with video switching.

  Next, a second embodiment of the present invention will be described. When playing back multiplexed content data, the playback time differs depending on the content, and when the content is switched, a situation may occur in which nothing is played back. For example, if the playback time of content A is 30 minutes, the playback time of content B is 90 minutes, and the playback time of content C is 60 minutes, these multiplexed content data are shown in FIG. To be played. The vertical axis is a time axis. Content A, B, and C are started to be reproduced at the same time. When the user views content B for 30 minutes and then switches to content A, the reproduction of content A is already finished. , Nothing appears on the display. Similarly, after viewing content B for 60 minutes, neither content A nor B can be viewed.

  Therefore, in the second embodiment, as shown in FIG. 9B, contents A, B, and C are loop-reproduced. Loop playback is to play content repeatedly and endlessly. Thus, even if the content B is viewed for 30 minutes and then switched to the content A, the content A can be viewed. Further, even after viewing the content B for 60 minutes, the content A and C can be viewed.

  The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to specific embodiments according to the present invention, and various modifications can be made within the scope of the gist of the present invention described in the claims. Deformation / change is possible. For example, in the above embodiment, the vehicle-mounted electronic device is targeted, but the present invention can also be used in a portable terminal or a one-segment receiver.

It is a block diagram which shows the structure of the vehicle-mounted electronic device which concerns on the Example of this invention. It is a figure explaining TS data structure. It is a block diagram which shows the structure of TS multiplexing part. It is a figure which shows the example of the multiplexed content data based on the Example of this invention. It is a figure which shows the example of the content data recorded conventionally. It is a flowchart which shows the operation | movement of recording / reproducing in the vehicle-mounted electronic apparatus of a present Example. It is a figure which shows the example of other multiplexed content data. It is a figure which shows the example of other multiplexed content data. FIG. 9A shows the relationship between the reproduction of multiplexed content data that is not loop-reproduced and time, and FIG. 9B shows the time axis when the multiplexed content data is reproduced in a loop according to the second embodiment. It is a figure which shows the relationship. It is a block diagram which shows the structure of the conventional vehicle-mounted electronic device. It is a flowchart which shows the recording / reproducing operation | movement in the conventional vehicle-mounted electronic device.

Explanation of symbols

1, 2: On-vehicle electronic device 10: Antenna 20: Tuner 30: OFDM demodulator 40: TS decoder 50, 50A: MPEG decoder 60: Display 70: Speaker 80: Recording device 90: User input 100, 100A: Controller 110: TS multiplexing unit 112: selection unit 114: multiplexing creation unit 116: recording unit 200: TS data structure 210: TS packet 220: header unit 222: identification unit 224: PAT
226: PMT 230: Data portion 232: Video ES 234: Audio ES
236: data ES 300: common identification unit 310: common PAT 3200: common PMT
330, 340, 350: Component group

Claims (10)

An electronic device having a function of reproducing and recording content data,
Extraction means for inputting encoded content data including identification data for identifying the reproduction data and the reproduction data, and extracting the reproduction data by decoding the identification data;
Decoding means for decoding the reproduction data extracted by the extraction means;
Output means for outputting the decrypted reproduction data;
Recording means for recording content data including reproduction data extracted by the extraction means and identification data corresponding thereto,
A multiplexing unit that creates multiplexed content data obtained by multiplexing a plurality of content data selected from the content data recorded in the recording unit, and records the multiplexed content data in the recording unit;
Control means for controlling the reproduction of the multiplexed content data,
The control means causes the extraction means to extract the reproduction data for each content data from the multiplexed content data, and the control means selects the reproduction means selected by the decoding means for decoding the reproduction data. Output data for
An electronic device. The electronic device according to claim 1, wherein the multiplexing unit multiplexes identification data of a plurality of content data. The electronic apparatus according to claim 1, further comprising receiving means for receiving terrestrial digital broadcasting, wherein the extracting means inputs a data stream output from the receiving means as the content data. The electronic device according to claim 3, wherein the recording unit records content data of a specific segment included in the data stream. The electronic device according to claim 1, wherein the control unit selects reproduction data output from the decoding unit in response to a user input. The electronic device according to claim 1, wherein the decoding unit sequentially decodes each reproduction data. The electronic apparatus according to claim 1, further comprising a data transfer means for transferring the multiplexed content data recorded in the recording means to the outside. An in-vehicle electronic device having a function of reproducing and recording content data,
Multiple antennas,
A plurality of tuners for receiving signals from a plurality of antennas;
A demodulator that demodulates the output signal from the review tuner and outputs a digitized transport storm;
Decoding means for inputting a transport stream from a demodulator and extracting reproduction data by decoding identification data included in the transport stream;
Reproducing means for reproducing the reproduction data extracted by the decoding means;
An output means for outputting the reproduced data;
Recording means for recording content data including reproduction data extracted by the decoding means and identification data corresponding thereto;
A plurality of content data is selected from a plurality of content data recorded by the recording means, multiplexed content data is created by multiplexing the selected plurality of content data, and the multiplexed content data is stored in the recording means. Multiplexing means for recording;
Control means for controlling the reproduction of the multiplexed content data,
The control means causes the decoding means to extract reproduction data of content data included in the multiplexed content data, and the control means is selected by the reproduction means reproducing the extracted reproduction data. In-vehicle electronic device that outputs data for playback. A method for recording and reproducing content data in an in-vehicle electronic device,
Inputting encoded content data including identification data for identifying the reproduction data and the reproduction data, and extracting the reproduction data by decoding the identification data;
Recording content data including the extracted reproduction data and identification data corresponding thereto;
Selecting a plurality of content data from a plurality of recorded content data, creating multiplexed content data obtained by multiplexing the plurality of content data, and recording the multiplexed content data;
Decoding the identification data of the multiplexed content data and extracting a plurality of reproduction data from the plurality of content data included in the multiplexed content data;
Replaying the plurality of extracted replay data; and
Outputting reproduction data selected from a plurality of reproduction data reproduced;
A method for recording and playing back content data. The recording / playback method according to claim 9, wherein the plurality of playback data are continuously loop-played.

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