JP4661469B2 - Broadcast receiving and recording device - Google Patents

Description

  The present invention relates to a broadcast reception recording apparatus and a broadcast reception recording method for receiving a digital broadcast stream and recording it on a recording medium.

  In recent years, MPEG2 (Moving Picture Experts Group phase 2) digital broadcast streams received by terrestrial digital tuners, BS digital tuners, etc., are recorded as they are on a recording medium such as an HDD or a DVD (direct recording). Broadcast receiving and recording devices that can read out, decode, and play back digital broadcast streams have become widespread.

  Also, during direct recording of the received digital broadcast stream to a recording medium, for example, the position (time) of a characteristic scene such as commercial entry / exit, title screen, scene change, and highlight scene is detected and recorded as a characteristic point. In addition, at the time of playback, broadcast reception recording that can read, decode, and play back a stream portion corresponding to a characteristic scene position (time) from a recording medium based on the recorded feature point information A device has been proposed.

In this proposal, in order to detect a characteristic scene, when the digital broadcast stream is directly recorded on a recording medium, the digital broadcast stream is decoded, and feature points are detected based on the decoded video signal and audio signal. (For example, Patent Document 1).
JP-A-11-312381

  A time stamp indicating the time of the stream is described in the header portion of the MPEG2 stream which is a digital broadcast stream. In order to access a part corresponding to a scene as a feature point from a digital broadcast stream recorded on a recording medium, the time stamp is used as a reference. However, since the decoded video signal and audio signal are only given to the feature point detector as inputs, the feature point detector indicates the position of the feature point at the time on the basis of the recording start of the stream. For this reason, in order to read out the correct part of the digital broadcast stream corresponding to the characteristic scene position from the characteristic point information from the recording medium and decode and reproduce it, the characteristic point detected by the characteristic point detector is detected. Therefore, it is necessary to correctly convert the position (time) of a scene to a time stamp of a digital broadcast stream, and a method for that is required.

  In addition, as shown in FIG. 5, the digital broadcast stream may have time stamp discontinuities due to switching of broadcast signal channel selection, broadcast interruption, communication environment fluctuation, and the like. Even with such time discontinuity of the time stamp, there is a possibility that a deviation occurs between the time axis of the feature point detector and the time axis of the digital broadcast stream recorded on the recording medium. That is, in FIG. 5, the time t1 of the feature point detector must be associated with the time T1 of the digital broadcast stream. However, since the T1 time stamp of the digital broadcast stream recorded on the recording medium exists in two places before and after the interruption of the digital broadcast stream, the type stamp corresponding to the feature point cannot be uniquely identified. It was.

  In view of such circumstances, the present invention provides a broadcast receiving and recording apparatus capable of correctly converting the time of a characteristic scene detected by a feature point detection unit into a time on a digital broadcast stream recorded directly on a recording medium, and It is intended to provide a broadcast reception recording method.

  In order to solve the above-described problems, a broadcast receiving and recording apparatus of the present invention receives a digital broadcast stream including at least a video stream, and records the digital broadcast stream received by the receiver on a recording medium. A recording unit; a decoding unit that decodes the digital broadcast stream received by the receiving unit to generate information necessary for detecting feature points; and a characteristic scene time based on the output of the decoding unit. A feature point detection unit that detects points, a feature point table creation unit that creates a feature point table by recording feature points detected by the feature point detection unit, and constant from the start of feature point detection by the feature point detection unit The time stamp of the digital broadcast stream is acquired at a time interval of, and the time continuation area is divided at the time discontinuity point of the acquired time stamp and the digital broadcast stream. A time stamp conversion table creating unit for creating a time stamp conversion table in association with each other, and a digital broadcast recorded on a recording medium by referring to the time stamp conversion table for the feature points registered in the feature point table And a conversion unit for converting to a time axis on the stream.

  According to the present invention, the time of the characteristic scene detected by the feature point detection unit can be correctly converted to the time on the digital broadcast stream directly recorded on the recording medium. Even if time discontinuity occurs in the time stamp of the digital broadcast stream, the time of the characteristic scene detected by the feature point detection unit is set to one time on the digital broadcast stream directly recorded on the recording medium. It can be uniquely identified.

  In the present invention, the recording unit may record a feature point table as a conversion result of the conversion unit on a recording medium.

  As a result, a recording medium on which the digital broadcast stream and the corresponding feature point table are recorded can be obtained. Through this recording medium, the digital broadcast stream and the feature point table can be transmitted to another broadcast receiving and recording apparatus. In this case, it is possible to perform jump playback to a characteristic scene of the digital broadcast stream without creating a feature point table again in the broadcast receiving and recording apparatus.

  Furthermore, in the present invention, the feature point detection unit detects the time of a characteristic scene as a feature point based on the output of the decoding unit and detects the scene classification, and the feature point table creation unit It is also possible to create a feature point table by associating and recording the feature points detected from the output unit and the scene classification.

  According to this, it is possible to selectively read out the time information of the feature points that match the selected scene classification, and to read out the corresponding part on the digital broadcast stream from the recording medium and play it back. It is.

  According to the broadcast reception recording apparatus and the broadcast reception recording method of the present invention, the time of the characteristic scene detected by the feature point detection unit is correctly converted to the time axis on the digital broadcast stream recorded directly on the recording medium. be able to.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a block diagram showing the configuration of a broadcast receiving and recording apparatus according to an embodiment of the present invention.

  As shown in the figure, a broadcast receiving and recording apparatus 100 according to this embodiment includes a tuner 1, a demodulator 2, an antenna 3, a playback demultiplexer 4, a playback video decoder 5, a playback audio decoder 6, Feature point detection system demultiplexer 9, feature point detection system video decoder 10, feature point detection system audio decoder 11, feature point detector 12, operation unit 13, HDD 14 (Hard Disk Drive), DVD (Digital Versatile Disc) A drive 15, a flash memory 16, a ROM 17 (Read Only Memory), a RAM 18 (Random Access Memory), a CPU 19 (Central Processing Unit), a bus 20, and the like are provided.

  The tuner 1 is a tuner that receives a digital broadcast stream through the antenna 3. Specifically, the tuner 1 is a BS digital broadcast tuner, a terrestrial digital broadcast tuner, or the like.

  The demodulator 2 is a circuit that demodulates the digital broadcast stream received by the tuner 1.

  The reproduction system demultiplexer 4 separates the digital broadcast stream output from the demodulator 2 into a video digital broadcast stream and an audio digital broadcast stream, and outputs them to the reproduction system video decoder 5 and the reproduction system audio decoder 6. It is.

  The playback video decoder 5 is means for decoding the video digital broadcast stream input from the playback demultiplexer 4 and outputting it to the display 7.

  The playback audio decoder 6 is means for decoding the audio digital broadcast stream input from the playback demultiplexer 4 and outputting the decoded audio digital broadcast stream to the speaker 8.

  The feature point detection system demultiplexer 9 separates the digital broadcast stream output from the demodulator 2 into a video digital broadcast stream and an audio digital broadcast stream to separate the feature point detection system video decoder 10 and the feature point detection system audio. It is means for outputting to the decoder 11.

  The feature point detection system video decoder 10 generates feature point information such as a GOP (Group Of Picture) start point, picture type, and length of the video digital broadcast stream input from the feature point detection system demultiplexer 9. This is means for decoding necessary information and outputting it to the feature point detector 12.

  The feature point detection system audio decoder 11 decodes information necessary for creating feature point information such as the start point of an audio frame from the audio digital broadcast stream input from the feature point detection system demultiplexer 9 to check the feature. It is means for outputting to the dispenser 12.

  The feature point detector 12 has characteristic features such as commercial entry / exit, title screen, scene change, and highlight scene from information input from the feature point detection system video decoder 10 and the feature point detection system audio decoder 11. This circuit detects a scene as a feature point and outputs the time. As a specific method for detecting a characteristic scene, for example, a feature point is detected for each screen of an image on the basis of audio information, a luminance component in the screen, and the like. There is a method of detecting a characteristic scene by comparing the magnitudes of changes.

  The operation unit 13 includes buttons, switches, keys, an operation confirmation display, and the like, and is a means for inputting various setting values and commands by the user and outputting them to the CPU 19.

  The HDD 14 is a drive device that records the digital broadcast stream output from the demodulator 2 on a fixed disk (hard disk) or reads it during reproduction.

  The optical drive 15 is a detachable optical disc such as a Blu-ray disc or a DVD disc (for example, a DVD-RAM, a DVD-R, a DVD-RW, a DVD + R, a DVD + RW, etc.) that is output from the demodulator 2. 21 is a drive device that records in 21 and reads out during playback. Examples of the optical drive 15 include a Blu-ray drive and a DVD drive.

  The flash memory 16 is a detachable recording medium that can record the digital broadcast stream output from the demodulator 2.

  The ROM 17 is a memory in which firmware such as programs to be executed by the CPU 19 and various parameters are fixedly stored.

  The RAM 18 is a memory that is used as a work area for the CPU 19 and temporarily holds processing data.

  The CPU 19 is a device that performs overall control of each block based on firmware stored in the ROM 17 and executes various arithmetic processes.

  The bus 20 is a communication path for inputting / outputting various information between blocks.

  Next, the operation when the digital broadcast stream is recorded on the recording medium in the broadcast receiving and recording apparatus 100 of this embodiment will be described.

  The digital broadcast stream received by the tuner 1 through the antenna 3 is demodulated by the demodulator 2 and then transferred to the HDD 14 or the optical drive 15 through the bus 20 under the control of the CPU 19 and then transferred to the HDD 14 or the optical drive. 15 is directly recorded (direct recording) on a recording medium such as the optical disk 21 mounted on the disk 15.

  Also, the digital broadcast stream demodulated by the demodulator 2 is output to the demultiplexer 9 of the feature point detection system under the control of the CPU 19, where it is separated into a video digital broadcast stream and an audio digital broadcast stream. Are output to the video decoder 10 for the feature point detection system and the audio decoder 11 for the feature point detection system.

  The decoded signal necessary for creating the feature point information obtained by the feature point detection system video decoder 10 and the feature point detection system audio decoder 11 is output to the feature point detector 12. , A process of detecting the position of a characteristic scene such as a commercial entry / exit, a title screen, a scene change, or a highlight scene as a feature point is started. The timer mounted on the feature point detector 12 is a timer having a unique time axis that starts time counting upon receiving notification from the CPU 19 that recording of a digital broadcast stream has started. The feature point detector 12 acquires time information corresponding to the detected characteristic scene position from the timer and notifies the CPU 19 so that the CPU 19 receives the time information and records it in the RAM 18 or the like. By repeating the above operation, a feature point table in which a list of time information of a plurality of characteristic scenes is recorded is created. Further, the feature point detector 12 notifies the CPU 19 when detection of feature points is started.

  FIG. 2 shows an example of the feature point table 22. As shown in the figure, the feature point table 22 includes items such as feature point times and feature point classifications. The time of the feature point is time information corresponding to the characteristic scene position detected by the feature point detector 12. The classification of feature points is information representing the classification of characteristic scenes such as commercial entry / exit, title screen, scene change, and highlight scene. The feature point classification is automatically determined by the feature point detector 12 and recorded in the feature point table 22, but the contents once recorded in the feature point table 22 are changed by the user operating the operation unit 13. It is also possible to do. At this time, a list of feature point classification candidates may be displayed so that the user can select and input an appropriate classification.

  The CPU 19 obtains a time stamp of the digital broadcast stream at a predetermined time interval from the timing at which the feature point detection start notification is received from the feature point detector 12 and records it in, for example, the RAM 18, thereby converting the time stamp. Create a table.

  FIG. 3 is an explanatory diagram regarding the time stamp conversion table 30 and its creation.

  The CPU 19 acquires time stamps described in the header of the digital broadcast stream at regular time intervals, and creates a time stamp conversion table 30 in which the acquired time stamps are associated with time sequence IDs. Here, the time sequence ID is determined based on all time stamps acquired from the digital broadcast stream, and the time Ta at which time discontinuity has occurred is determined. The ID is uniquely assigned to each time continuous area 31 and 32 in ascending order.

  Even if a time discontinuity of a digital broadcast stream occurs and a temporally overlapping stream portion is recorded by such a time stamp conversion table 30, these temporally overlapping digital broadcast streams are recorded by a time sequence ID. It can be differentiated.

  Almost simultaneously with the completion of recording of the digital broadcast stream on the recording medium, the feature point table 22 and the time stamp conversion table 30 corresponding to the digital broadcast stream are completed.

  After the creation of the feature point table 22 and the time stamp conversion table 30 as described above, the time information of the feature points registered in the feature point table 22 is referred to the time stamp conversion table 30 and the recording medium. Is converted to time on the time axis on the digital broadcast stream recorded in

  This conversion is performed as follows. First, the CPU 19 reads time information of feature points from the top of the feature point table 22. The time information of the feature points registered in the feature point table 22 and the data in each column of the time stamp conversion table 30 have the same time axis. That is, the time stamp is registered in the time stamp conversion table 30 every N [sec], and the time indicated by the time information of the feature point is a time 2N [sec] after the start of the feature point detection. Then, the time of the feature point is replaced with a time stamp value “TimeStamp # 3” belonging to the continuous time region having the time sequence ID “Timeseq_id # n + 3”. Further, when the time indicated by the time information of the feature point is a position of 2.5 N [sec] from the start of detection of the feature point, the time of the feature point is the time sequence ID “Timeseq_id # n + 3”. Timestamp value “TimeStamp # 3” belonging to the continuous time area and intermediate time stamp value “TimeStamp # 4” belonging to the continuous time area whose time sequence ID is “Timeseq_id # n + 4” Is replaced by

  By repeating such conversion for the time information of all feature points registered in the feature point table 22, as shown in FIG. 4, the digital broadcast stream in which the time information of all feature points is recorded on the recording medium. The feature point table 23 replaced with the upper time axis can be created.

  In this way, the feature point table 23 in which the time information of all feature points is replaced with the time on the digital broadcast stream recorded on the recording medium is recorded on the recording medium on which the digital broadcast stream is directly recorded. The time stamp conversion table 30 is deleted from the RAM 18.

  Next, an operation when performing jump reproduction to a characteristic scene of a digital broadcast stream using the feature point table 23 recorded on the recording medium will be described.

  The CPU 19 first reads a digital broadcast stream from the recording medium and outputs it to the reproduction demultiplexer 4 through the bus. The demultiplexer 4 separates the input digital broadcast stream into a video digital broadcast stream and an audio digital broadcast stream, and the respective streams are decoded by a playback video decoder 5 and a playback audio decoder 6, respectively. The video signal and audio signal are output to the display 7 and the speaker 8, respectively. Thereby, each reproduction | regeneration of a video signal and an audio signal is performed.

  During playback of this digital broadcast stream, for example, each time the jump button is pressed once by operating the operation unit 13, the CPU 19 records time information of feature points in the feature point table 23 recorded together with the digital broadcast stream on the recording medium. In order from the head, and based on the time information of this feature point, the corresponding part of the digital broadcast stream recorded on the recording medium is read out and output to the demultiplexer 4 of the reproduction system. Do.

  At this time, the user operates the operation unit 13 to select a feature point classification, so that the CPU 19 selectively reads out the time information of the feature points that match the selected feature point classification, It is possible to perform control so that the corresponding part on the digital broadcast stream is read from the recording medium and reproduced.

  If the digital broadcast stream and the feature point table 23 after correcting the time axis are recorded on a recording medium that is detachable from the drive device such as the optical disk 21, the digital broadcast stream and the feature point table 23 can be digitally transmitted to another broadcast receiving and recording device through this recording medium. It is possible to transmit the feature point table 23 after correcting the broadcast stream and the time axis. In this case, it is possible to perform jump playback to the characteristic scene of the digital broadcast stream without creating the feature point table 22 again in the broadcast receiving and recording apparatus.

  As described above, according to the broadcast receiving and recording apparatus 100 of the present embodiment, the time of the characteristic scene detected by the feature point detector 12 is correctly set on the time axis on the digital broadcast stream directly recorded on the recording medium. Can be converted. Even if time discontinuity of the time stamp of the digital broadcast stream occurs, the time of the characteristic scene detected by the feature point detector 12 is set to one time on the digital broadcast stream directly recorded on the recording medium. Can be uniquely identified.

  The embodiment according to the present invention has been described above, but the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the present invention. .

FIG. 1 is a block diagram showing a configuration of a broadcast receiving and recording apparatus according to an embodiment of the present invention. It is a figure which shows a feature point table. It is explanatory drawing regarding a time stamp conversion table and its preparation. It is a figure which shows the example of the feature point table which replaced the time of the feature point with the time axis on a digital broadcast stream using a time stamp conversion table. It is a figure which shows the time discontinuity of the time stamp of a digital broadcast stream.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Tuner 2 Demodulator 3 Antenna 4 Playback system demultiplexer 5 Playback system video decoder 6 Playback system audio decoder 7 Display 8 Speaker 9 Feature point detection system demultiplexer 10 Feature point detection system video decoder 11 Feature point detection system Audio decoder 12 feature point detector 13 operation unit 14 HDD
15 Optical drive 16 Flash memory 17 ROM
18 RAM
19 CPU
20 Bus 21 Optical disc 22 Feature point table 23 Feature point table after conversion 30 Time stamp conversion table 100 Broadcast reception recording device

Claims (1)

A receiver for receiving a digital broadcast stream including at least a video stream;
A recording unit for recording the digital broadcast stream received by the receiving unit on a recording medium;
A decoding unit that decodes the digital broadcast stream received by the receiving unit and generates information necessary for detecting feature points;
A feature point detection unit for detecting a characteristic scene time as the feature point based on the output of the decoding unit;
A feature point table creating unit that creates a feature point table by recording the feature points detected by the feature point detecting unit;
The feature point detection unit detects the time of a characteristic scene as a feature point based on the output of the decoding unit and detects the classification of the scene,
The feature point table creation unit
A feature point table is created by associating and recording the feature points detected by the feature point detection unit and the classification of the scene,
By displaying a list of a plurality of change candidates for classification recorded in the feature point table on a display unit, and accepting a user operation for selecting a specific change candidate among the plurality of change candidates through the operation unit, A broadcast receiving and recording apparatus for changing the classification of the scene in the created feature point table .

Images