JP3526414B2 - Information recording / reproducing method and information recording / reproducing device - Google Patents

Information recording / reproducing method and information recording / reproducing device

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Publication number
JP3526414B2
JP3526414B2 JP09376199A JP9376199A JP3526414B2 JP 3526414 B2 JP3526414 B2 JP 3526414B2 JP 09376199 A JP09376199 A JP 09376199A JP 9376199 A JP9376199 A JP 9376199A JP 3526414 B2 JP3526414 B2 JP 3526414B2
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Prior art keywords
recording
stream
reproducing
information
recording medium
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JP09376199A
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Japanese (ja)
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JP2000286715A (en
Inventor
晋一郎 古藤
慶一郎 藤江
克己 高橋
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株式会社東芝
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Priority to JP09376199A priority Critical patent/JP3526414B2/en
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Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information recording / reproducing method for recording / reproducing a compressed information stream such as a digital broadcast, and information recording / reproducing using the same. Equipment related. [0002] In digital broadcasting, programs are transmitted as compressed streams. In the case of reproduction on the receiving side, decoding and decompression are performed. When recording is performed on the receiving side, the data is recorded while being encrypted or compressed. When the recorded stream is reproduced, the same decoding and decompression processing as when the stream is received is performed. [0003] In the case of reproducing a recorded stream, and in the case of reproducing at a normal speed from the beginning like a broadcast program, simply reading the recorded stream from the beginning and reproducing it Good, but search, jump,
To perform trick play (fast forward, etc.), it is necessary to analyze the recorded stream. However, in general, the data is encrypted and cannot be analyzed because it can be decrypted only by a predetermined reproducing device. Even if the data is not encrypted or can be decrypted, the bit rate is determined by broadcasting, so if the bit rate is high, the analysis takes a long time and is not practical. Furthermore, in the case of fast-forwarding, the bit rate may increase and reach the limit of the network transfer, or may reach the limit of the bit rate of the television decoder. Therefore, the present invention provides a method for recording a compressed video or a video and audio stream, which is more advanced than a normal reproduction such as a search on the stream or a special reproduction such as a fast-forward reproduction after recording. An object of the present invention is to provide an information recording / reproducing method and an information recording / reproducing apparatus using the same, which can easily realize reproduction control (which requires analysis of a stream). An information recording / reproducing method according to the present invention is an information recording / reproducing method for reproducing and recording a compressed information stream. The information stream is decompressed and then recompressed, and reproduction control of the recorded information stream is performed based on characteristic information of the information stream detected at that time. Preferably, one of the input information stream and an information stream generated by expanding and recompressing the information stream is selected according to the type of reproduction control. [0007] According to the information recording / reproducing method of the present invention, even when a compressed video or an information stream of video and audio is recorded, search and retrieval on the stream after recording are performed.
It is also possible to easily realize more advanced (such as stream analysis) playback control than normal playback such as special playback such as fast-forward playback. Also, since the recompressed information stream is more redundant than the original information stream,
For normal reproduction, it is more efficient to perform decompression and reproduction using the original information stream. In an information recording / reproducing apparatus for reproducing and recording a compressed information stream, the information recording / reproducing apparatus of the present invention expands and recompresses the information stream when recording the input information stream. Detecting means for detecting characteristic information of the information stream, and retransmission control means for controlling reproduction of the recorded information stream based on the characteristic information detected by the detecting means. [0009] Preferably, one of the input information stream and an information stream generated by expanding and recompressing the information stream is selected according to the type of reproduction control. According to the information recording / reproducing apparatus of the present invention, even when a compressed video or an information stream of video and audio is recorded, a search on the stream can be performed after recording.
It is also possible to easily realize more advanced (such as stream analysis) playback control than normal playback such as special playback such as fast-forward playback. Also, since the recompressed information stream is more redundant than the original information stream,
For normal reproduction, it is more efficient to perform decompression and reproduction using the original information stream. An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows an example of the configuration of a broadcast receiving system according to this embodiment, which comprises a set-top box 1, a video / audio recording / reproducing device 2, a controller 3, and a monitor / speaker 4. FIG. 2 shows an example of the internal configuration of the video / audio recording / reproducing apparatus 2, and FIG.
Shown in The set-top box 1 receives a digital broadcast signal 5, extracts a bit stream, and outputs a designated one-channel stream as a single program bit stream (digital data) 6 to the outside. It has a function of decoding the obtained one channel and outputting it as a video / audio analog signal (analog video signal 7, analog audio signal 8). The video / audio recording / reproducing apparatus 2 has a function of inputting / outputting digital data 6 and inputting an analog video signal 7 and an analog audio signal 8 with the set-top box 1. It has a function of encoding an analog signal internally, and can simultaneously output digital data (hereinafter, referred to as a single program bit stream) and a stream in which the analog signal is encoded (hereinafter, referred to as a re-encoded bit stream). Can be recorded separately. The controller 3 is used by a user to input information necessary for receiving a broadcast, selecting a program, reproducing recorded data, and transmitting the information to the video / audio recording / reproducing apparatus 2 and the set-top box 1. is there. First, a processing operation for recording a digitally broadcast program in the system of FIG. 1 will be described. (1) Operation of the Controller 3 at the Time of Recording It is assumed that the controller 3 knows in advance the correspondence between the broadcast channel, the radio wave frequency, and the program number of the transport stream. Step S1: A user inputs a program to be recorded by, for example, a channel and a start / end time or a program name. Step S2: Set-top box 1
, The frequency corresponding to the program and the program number of the transport stream are passed, and broadcast reception and reproduction are instructed. Step S3: Video / audio recording / reproducing device 2
Is instructed to record digital data 6 and analog signals 7 and 8 output from the set-top box 1.
At this time, in addition to the program number of the transport stream of the program to be recorded, for example, a channel and a start / end time or a program name are passed. (2) Operation of Set-top Box 1 During Recording Step S4: The control unit 34 sends the frequency corresponding to the channel or program name specified by the controller 3 to the digital demodulation unit 32 and the program number of the transport stream. To the transport stream decoder 3
Tell 6 Further, the transport stream decoder input switching unit 35 switches to data from the digital demodulation unit 32 instead of data from the digital data input / output IF unit 43. Step S5: The transport stream decoder 36 has a PAT (program association table), a PMT (program map table),
Using a CAT (conditional access table), data corresponding to the program number is passed to the video decoder 37 and the audio decoder 39, and the video D / D
An A / D converter 38 and an audio D / A converter 40 convert the signal into an analog video signal 7 and an analog audio signal 8, respectively. Step S 6: At the same time, a single program bit stream composed of PAT, PMT, CAT, video signal and audio signal necessary for performing the above operation is transmitted to the video / audio recording / reproducing apparatus via the digital data input / output IF unit 43. Hand over to 2. The stream is passed from the beginning of the program, and data before that is discarded by the set-top box 1 and is not passed to the video / audio recording / reproducing device 2. (3) Operation of Video / Audio Recording / Reproducing Apparatus 2 at Recording Step S 7: The control unit 20 receives a recording instruction from the controller 3. At this time, for example, the channel and the start / end time of the program to be recorded or the program name are received together. E.g. channel and start / end time of program to be recorded, or program name and internal single program bit stream,
It has a table (hereinafter, referred to as a file table) that associates the file name of the re-encoded bit stream. The control unit 20 determines an appropriate internal stream name and registers it in the file table. Step S8: The control unit 20 sends an instruction to start encoding to the video encoder 17, the audio encoder 18, and the transport stream multiplexing unit 19 at the timing when a single program bit stream starts coming from the digital data input / output IF unit 14. put out. Step S9: Video A / D converter 15
Converts the analog video signal 7 into, for example, CCIR (Internat
ional Radio Consultative Committee) 656 format and pass it to the video encoder 17. The video encoder 17 encodes an MPEG2 video stream, for example. At this time, each GOP (Group of Pictu
res) adds a sequence header before the GOP as a closed GOP, and enables random access from that part (this point is called a random access point).
In addition, scene change information and the like detected by the video encoder 17 are transmitted to the control unit 20. Step S10: The audio A / D converter 16 converts the analog audio signal into PCM data and passes it to the audio encoder 18. The audio encoder 18 encodes, for example, an MPEG2 audio stream. The audio encoder 18 may encode into a Dolby AC3 stream or output as a PCM stream. Step S11: The transport stream multiplexing section 19 multiplexes the stream output from the video encoder 17 and the stream output from the audio encoder 18 into, for example, an MPEG2 transport stream and outputs the multiplexed stream.
Then, a position where reproduction from the random access point is possible is transmitted to the control unit 20. Step S12: The control unit 20 registers the single program bit stream from the digital data input / output IF unit 14 and the re-encoded bit stream from the transport stream multiplexing unit 19 in the file table on the recording medium 20. And save them as separate streams with the specified file names. Step S13: The position of each random access point in the re-encoded bit stream, the reproduction time of the random access point from the head of the stream, and the single program recorded when the random access point is recorded on the recording medium 21 The position of the bit stream is simultaneously recorded on the recording medium 21 as a random access table. Step S14: Video encoder 17
And the stream change information detected in step (1) and the stream position information are simultaneously recorded in the recording medium 21 as a program structure information table. Step S15: For the program structure information table, during or after the recording of the program, the control unit 2
The stream structure may be analyzed with 0, and the analysis result (for example, the start position of each chapter, the position of the CM, etc.) may be added to the program structure information table. Next, a description will be given of a processing operation when data (a stream recorded on the recording medium 21) in the video / audio recording / reproducing apparatus 2 is normally reproduced. (4) Operation of Controller 3 During Reproduction Step S16: The user obtains a recorded program list owned by the video / audio recording / reproducing apparatus 2, and the user selects a program name from the list. At this time, the structure of the program may be indicated to the user based on the program structure information table. Step S17: Instruct the set-top box 1 for stream reproduction and the program number in the video / audio recording / reproducing device 2. Step S18: Instruct the video / audio recording / reproducing apparatus 2 to reproduce the stream in the video / audio recording / reproducing apparatus 2, the program to be reproduced, and the reproduction time from the beginning of the stream. (5) Operation of the Video / Audio Recording / Reproducing Apparatus 2 at the Time of Reproduction Step S19: The control unit 20 teaches the contents of the file table in response to a request from the controller 3. Step S20: When the control unit 20 receives the name of the program to be reproduced and the reproduction time from the beginning of the stream from the controller 3, the file name of the single program bit stream, the re-encoded bit stream and the random access Know the file name of the file. Step S21: The control unit 20 knows the position of the single program bit stream recorded at the reproduction time from the beginning of the stream from the random access file. Actually, since the re-encoded bit stream is delayed in time by various delays from the single program bit stream, an appropriate offset (for example, the first bit from the transport stream multiplexing unit 19) is added to the position of the bit stream of the random access file. A value to which a single program bit stream recorded until the stream comes out) is added as a read start position. Step S22: The single program bit stream is read from the read start position and the data is transferred from the digital data input / output IF unit 14 to the set top box 1. (6) Operation of Set-Top Box 1 During Playback Step S23: Control Unit 3 of Set-Top Box 1
4 receives from the controller 3 an instruction to receive a stream from the video / audio recording / reproducing apparatus 2 and a program number of the transport stream. Step S24: The transport stream decoder input switching section 35 is switched to the digital data input / output I
The data is switched to the data from the F unit 43. Step S25: The transport stream decoder 36 uses the PAT (program association table), PMT (program map table), and CAT (conditional access table) to convert the data corresponding to the program number into the video decoder 37 and the audio. The result is passed to a decoder 39, and the decoded result is converted into an analog video signal 7 and an analog audio signal 8 by a video D / A converter 38 and an audio D / A converter 40, respectively. Next, a description will be given of a processing operation in a case where a stream recorded on the recording medium 21 is reproduced at a high speed and a cue is performed. Fast forward reproduction is performed using the re-encoded stream. (7) Operation of the controller 3 at the time of fast-forward reproduction Step S26: The video-audio recording / reproducing apparatus 2 is instructed on the fast-forward reproduction of the stream in the video-audio recording / reproducing apparatus 2, a program to be reproduced, and a start position. Step S27: The stream reproduction from the video / audio recording / reproducing apparatus 2 and the program number are instructed to the set-top box 1. Step S28: When stopping, the video / audio recording / reproducing apparatus 2 is instructed to stop. (8) Operation of the video / audio recording / reproducing apparatus 2 during fast-forward playback Step S29: A fast-forward playback command is received from the controller 3. Step S30: Using the random access table, extract only I pictures from the re-encoded stream for fast-forwarding, and when the set-top box 1 plays back the stream, a transport stream that looks like fast-forward playback is created. And send it out. Step S31: When receiving a reproduction stop command from the controller 3, the transmission of the stream is stopped. The playback time from the head of the last I picture transmitted is returned to the controller 3. (9) The operation of the set-top box 1 at the time of fast forward reproduction The same operation as that of the normal reproduction of (6) is performed. In the above-described embodiment, the fast forward reproduction is described as an example. However, the present invention is not limited to this case. A random stream that records information detected when a received stream is once decoded, decompressed, and recompressed is recorded. By referring to the access table and the like, a screen search, a jump, and the like can be immediately performed on the recorded stream without analyzing the recorded stream. As described above, according to the present invention,
Even when recording a compressed video or a video and audio stream, after recording, search,
It is also possible to easily realize more advanced (such as stream analysis) playback control than normal playback such as fast forward playback and special playback such as search.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram showing a configuration example of a broadcast receiving system according to an embodiment of the present invention. FIG. 2 is a diagram showing an example of the internal configuration of a video / audio recording / reproducing device. FIG. 3 is a diagram showing an example of an internal configuration of a set-top box. [Description of Signs] 1 ... Set-top box 2 ... Video / audio recording / reproducing device 3 ... Controller 4 ... Monitor / speaker 5 ... Digital broadcast signal 6 ... Digital data 7 ... Analog video signal 8 ... Analog audio signal 14 ... Digital data input / output IF unit 15 video A / D conversion unit 16 audio A / D conversion unit 17 video encoder 18 audio encoder 19 transport stream multiplexing unit 20 control unit 21 recording medium 32 digital demodulation unit 34 control unit 35 transport stream decoder input switching section 36 transport stream decoder 37 video decoder 38 video D / A conversion section 39 audio decoder 40 audio D / A conversion section 43 digital data input / output IF section

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-8-9332 (JP, A) JP-A-7-50840 (JP, A) JP-A-8-125966 (JP, A) JP-A 8-96 149411 (JP, A) (58) Fields investigated (Int. Cl. 7 , DB name) H03M 7/30 G11B 20/10 301 H04N 5/92 G06F 5/00

Claims (1)

  1. (57) [Claim 1] In an information recording / reproducing method for reproducing / recording a broadcast-distributed information stream, a step of recording the broadcast-distributed information stream on a recording medium; Reproducing the video signal; and encoding the reproduced video signal to generate an MPEG video stream, and setting a reproduction time from the head of the information stream of each GOP serving as a random access point in the MPEG video stream. Recording the position of the information stream recorded on the recording medium at the reproduction time of each random access point on the recording medium, and recording the generated MPEG video stream on the recording medium. And normal playback is instructed Reproducing the information stream recorded on the recording medium from a read start position based on the instructed reproduction time, and when the fast forward reproduction is instructed, the MPEG video stream recorded on the recording medium. comprising the steps of reproducing from the indicated forward reproduction each GOP after the start position during by extracting only the I-picture, and when the stop of the fast-forward reproduction is instructed, fast-forward reproduction odor
    The playback time of the last I picture played back
    Controls to specify the raw start position and the playback time during normal playback
    An information recording / reproducing method, wherein the information is returned to a roller . 2. An information recording / reproducing apparatus for reproducing and recording a broadcast-distributed information stream, comprising: means for recording a broadcast-distributed information stream on a recording medium; means for reproducing a video signal from the information stream; While generating the MPEG video stream by encoding the obtained video signal, while recording the reproduction time from the head of the information stream of each GOP serving as a random access point in the MPEG video stream on the recording medium, Means for recording the position of the information stream recorded on the recording medium at the reproduction time of the random access point on the recording medium; means for recording the generated MPEG video stream on the recording medium; When instructed, read based on the instructed playback time Means for reproducing the information stream recorded on the recording medium from the start position for outputting, and when fast forward reproduction is instructed, after the designated fast forward reproduction start position in the MPEG video stream recorded on the recording medium Means for extracting and playing only I-pictures from each GOP, and when fast-forward playback is instructed to stop,
    The playback time of the last I picture played back
    Controls to specify the raw start position and the playback time during normal playback
    An information recording / reproducing apparatus, comprising: means for returning to a roller .
JP09376199A 1999-03-31 1999-03-31 Information recording / reproducing method and information recording / reproducing device Expired - Fee Related JP3526414B2 (en)

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US6711558B1 (en) 2000-04-07 2004-03-23 Washington University Associative database scanning and information retrieval
US8095508B2 (en) 2000-04-07 2012-01-10 Washington University Intelligent data storage and processing using FPGA devices
JP2006526227A (en) 2003-05-23 2006-11-16 データ・サーチ・システムズ・インコーポレイテツド Intelligent data storage and processing using FPGA devices
EP1859378A2 (en) 2005-03-03 2007-11-28 Washington University Method and apparatus for performing biosequence similarity searching
US8886014B2 (en) 2005-08-11 2014-11-11 Mitsubishi Electric Corporation Video recording apparatus, scene change extraction method, and video audio recording apparatus
US7702629B2 (en) 2005-12-02 2010-04-20 Exegy Incorporated Method and device for high performance regular expression pattern matching
US7954114B2 (en) 2006-01-26 2011-05-31 Exegy Incorporated Firmware socket module for FPGA-based pipeline processing
WO2007121035A2 (en) 2006-03-23 2007-10-25 Exegy Incorporated Method and system for high throughput blockwise independent encryption/decryption
US7921046B2 (en) 2006-06-19 2011-04-05 Exegy Incorporated High speed processing of financial information using FPGA devices
US8326819B2 (en) 2006-11-13 2012-12-04 Exegy Incorporated Method and system for high performance data metatagging and data indexing using coprocessors
US8879727B2 (en) 2007-08-31 2014-11-04 Ip Reservoir, Llc Method and apparatus for hardware-accelerated encryption/decryption
US8374986B2 (en) 2008-05-15 2013-02-12 Exegy Incorporated Method and system for accelerated stream processing
WO2010077829A1 (en) 2008-12-15 2010-07-08 Exegy Incorporated Method and apparatus for high-speed processing of financial market depth data
US10037568B2 (en) 2010-12-09 2018-07-31 Ip Reservoir, Llc Method and apparatus for managing orders in financial markets
JP5036882B2 (en) * 2011-01-14 2012-09-26 三菱電機株式会社 Video recording apparatus, video recording method, video / audio recording apparatus, and video / audio recording method
US10121196B2 (en) 2012-03-27 2018-11-06 Ip Reservoir, Llc Offload processing of data packets containing financial market data
US9990393B2 (en) 2012-03-27 2018-06-05 Ip Reservoir, Llc Intelligent feed switch
US9633093B2 (en) 2012-10-23 2017-04-25 Ip Reservoir, Llc Method and apparatus for accelerated format translation of data in a delimited data format
US9633097B2 (en) 2012-10-23 2017-04-25 Ip Reservoir, Llc Method and apparatus for record pivoting to accelerate processing of data fields
EP2912579A4 (en) 2012-10-23 2016-08-17 Ip Reservoir Llc Method and apparatus for accelerated format translation of data in a delimited data format

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