JP2007104644A - Video signal recording apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a video signal recording apparatus for easily detecting an editing point where seamless recording can be normally performed, and for generating stream data which can be continuously decoded by seamless recording. <P>SOLUTION: When performing seamless recording, additional information included in a predetermined unit of data in recording data is detected, and an editing point for performing seamless recording is determined based on the information indicating at least the presence of an editing point where the seamless recording can be performed, the field arrangement order and presence/absence of a repeat field included in the additional information. The seamless recording is performed from a position based on the determined editing point. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a video signal recording apparatus for recording a compression-encoded video signal on a recording medium.

  In recent years, a camera-integrated VTR (Video Tape Recorder) capable of recording and reproducing HD (High Definition) video signals has been commercialized. The HD compatible camera-integrated VTR employs MPEG (Moving Picture Experts Group) -2 as a compression encoding technique for video signals. Then, the compression-encoded bit stream is recorded on the magnetic tape by a recording method in which an error correction code generation unit (hereinafter also referred to as ECC unit) is a minimum recording unit.

The following prior arts are known for a linkage recording method for recording an HD video signal on a magnetic tape. When re-recording new data on a magnetic tape on which data has already been recorded, an error correction code is generated in the smallest unit of recording. Proposals have been made to perform re-recording after detecting the minimum unit of recording including the. (For example, refer to Patent Document 1.)
JP 2000-134568 A

  The above conventional technique detects a switching point of a frame within a minimum recording unit reproduced from an already recorded magnetic tape, and re-records new data from the frame switching point. However, the configuration of the above prior art only detects a frame switching point, and refers to information indicating the field of the first frame in the display order at the frame switching point and information indicating the presence / absence of a redundant repeated field. Not done. This causes the following problem.

When the data already recorded on the magnetic tape is 24 frame progressive (hereinafter referred to as 24p),
1: Depending on the connected frames, the same field continues, resulting in a field item number error.
2: A decoding time that does not normally occur at an edit point (edit point) occurs.

  Next, the above problem will be described in detail. FIG. 2 shows a state in which a 24p video signal is recorded on a magnetic tape, and a 60 field interlaced (hereinafter referred to as 60i) or 30 frame progressive (hereinafter referred to as 30p) video signal on a magnetic tape. Shows the situation when recorded.

  Here, since the film is 24 frames per second, the video signal (NTSC format) recorded on the magnetic tape is 30 frames per second (60 fields). Therefore, as shown in FIG. In this case, the number of fields is converted by 2-3 pulldown.

  Specifically, 2-3 pull-down is a method of performing 24p field number conversion by inserting redundant repeated fields (hereinafter referred to as repeat fields) for each frame, as shown in FIG. . Since the 2-3 pull-down video signal has a repeat field for each frame, a frame starting from the top field and a frame starting from the bottom field are switched every two frames.

  On the other hand, when recording a normal 60i or 30p video signal, as shown in FIG. 2, since two consecutive fields from the normal top field are encoded as one frame, all frames start from the top field. It becomes.

  Therefore, when a 60-i video signal is MPEG-encoded and recorded as new data when the 2-3 pull-down video signal is MPEG-encoded and recorded on a tape, the top field is a continuous field depending on the connection frame position. No. error occurs. 4A and 4B are diagrams showing an example in which a field item number error occurs, and FIG. 5 shows the details thereof. In such a case, it becomes inappropriate as an edit point of the connection record.

  In addition, since there is no rule regarding the repeat field, in the example shown in FIG. 4C, a decoding time that does not normally occur at the editing point occurs. FIG. 6 is an enlarged view of the example of FIG. 4C in the order of symbols. As is clear from FIG. 6, when the example of FIG. 4C is rearranged in the code order, an incorrect decoding time is generated.

  In other words, when the video signal already recorded on the magnetic tape is 24p, when connecting and recording a 60i video signal, only FIG. 4D can be performed normally. Could not detect possible edit points.

  Therefore, the present invention solves the problems of the prior art. For example, even if a video signal of 24p is recorded, it is possible to easily detect editing points at which continuous recording is possible, and continuously by continuous recording. Another object of the present invention is to provide a video signal recording apparatus capable of generating stream data that can be decoded.

  Another object of the present invention is to provide a video signal recording apparatus that performs continuous recording according to the detection result of the editing point.

  An object of the present invention is a video signal recording apparatus for recording unit data obtained by unitizing stream data on a tape-like recording medium on the basis of an error correction processing unit, and recording means for recording the unit data on the recording medium And detecting means for detecting additional information included in the unit data recorded on the recording medium; analyzing the additional information detected by the detecting means; and at least the presence or absence of an edit point that enables continuous recording; Unit data consisting of second stream data is connected and recorded on the recording medium on which unit data consisting of first stream data is recorded and analysis means for acquiring information indicating the field arrangement order and the presence or absence of repeat fields. A joint recording control means for controlling the operation, and when performing joint recording, the joint recording control means The recording control means determines an edit point for connecting and recording the unit data composed of the first stream data based on the information acquired by the analyzing means, and the second point from the position based on the determined edit point. This is achieved by a video signal recording apparatus characterized in that unit data for recording the stream data is generated and recorded by the recording means.

  Another object of the present invention is to provide a video signal recording apparatus for recording unit data obtained by unitizing stream data on a tape-like recording medium on the basis of an error correction processing unit, and recording the unit data on the recording medium. Recording means, detection means for detecting edit points that enable continuous recording from unit data recorded on the recording medium, field arrangement order related to edit points detected by the detection means, and presence / absence of repeat fields Analysis means for analyzing information, first determination means for determining whether or not the stream data relating to the edit point detected by the detection means is in a progressive format of 24 frames / second, and a stream to be newly recorded A second determination method for determining whether or not the data is in a progressive format of 24 frames / second If the determination result of the first determination means is in a progressive format of 24 frames / second, and the determination result of the second determination means is not in a progressive format of 24 frames / second, the analysis means analyzes the result. And a linkage recording control means for determining whether or not to newly record the stream data to be newly recorded from the position based on the editing point detected by the detection means based on the content. It is also achieved by a signal recording device.

  Another object of the present invention is to provide a video signal recording apparatus for recording unit data obtained by unitizing stream data on a tape-like recording medium on the basis of an error correction processing unit, and recording the unit data on the recording medium. Recording means, detection means for detecting edit points that enable continuous recording from unit data recorded on the recording medium, field arrangement order related to edit points detected by the detection means, and presence / absence of repeat fields Analysis means for analyzing information, first determination means for determining whether or not the stream data relating to the edit point detected by the detection means is in a progressive format of 24 frames / second, and a stream to be newly recorded A second determination method for determining whether or not the data is in a progressive format of 24 frames / second If the determination result of the first determination means is in a progressive format of 24 frames / second, and the determination result of the second determination means is not in a progressive format of 24 frames / second, the analysis means analyzes the result. A connection recording control means for determining whether or not to confirm the edit point detected by the detection means as a connection edit point for connection recording based on the contents, and to control to detect the next edit point if not determined It is also achieved by a video signal recording device characterized by comprising:

  Further, the above object is a video signal recording apparatus for recording unit data obtained by unitizing stream data on a tape-like recording medium on the basis of an error correction processing unit, and recording the unit data on the recording medium. Recording means, detection means for detecting edit points that enable continuous recording from unit data recorded on the recording medium, field arrangement order related to edit points detected by the detection means, and presence / absence of repeat fields Analysis means for analyzing information, first determination means for determining whether or not the stream data relating to the edit point detected by the detection means is in a progressive format of 24 frames / second, and a stream to be newly recorded Second determination to determine whether the data is in progressive format at 24 frames / second And when the determination result of the first determination means is in a progressive format of 24 frames / second and the determination result of the second determination means is in a progressive format of 24 frames / second, the analysis means analyzes Based on the recorded content, a linkage for determining whether to newly record the stream data to be newly recorded from the position based on the editing point detected by the detection means or to perform discontinuous recording by inserting invalid data. The present invention is also achieved by a video signal recording apparatus comprising a recording control means.

  According to the present invention, it is possible to generate continuous stream data free from field item number errors or field omissions during connection recording. Furthermore, it is possible to suppress the generation of a decoding time that does not normally occur at the editing point, and to generate continuous stream data that can be guaranteed to be decoded by a general decoder.

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

  FIG. 1 is a block diagram showing a configuration example of a video signal recording apparatus according to the present invention. Such a recording apparatus can be applied to a camera-integrated video recorder or the like. In FIG. 1, reference numeral 100 denotes a memory unit such as an SDRAM, which has a configuration capable of storing a plurality of types of data. Reference numeral 101 denotes a VIDEO IN / OUT terminal for inputting / outputting a video signal, reference numeral 102 denotes an AUDIO IN / OUT terminal for inputting / outputting an audio signal, and reference numeral 103 denotes an MPEG codec (encoding / decoding circuit) for compressing or expanding the video signal and the audio signal. ). Hereinafter, for simplification of description, the video signal is described as including an audio signal.

  Reference numeral 105 denotes a stream buffer for accumulating an MPEG compressed video signal (MPEG stream), and reference numeral 104 denotes a buffer management unit for writing / reading the stream buffer 105. The buffer management unit 104 transfers the MPEG stream between the stream buffer 105 and the ECC work memory 107. Reference numeral 107 denotes an ECC work memory, and reference numeral 106 denotes an error correction unit that performs error correction processing on the MPEG stream using the ECC work memory 107.

  Reference numeral 108 denotes a capture memory for storing ECC unit data including edit points (edit points). A modulation / demodulation unit 109 modulates / demodulates an analog signal when recording / reproducing recorded data composed of an MPEG stream in units of ECC units on / from a magnetic tape. Reference numeral 110 denotes a controller (control unit) that controls the operation of each block according to an instruction from an operation unit (not shown), and 111 denotes a capstan motor that drives the magnetic tape 113 according to control from the controller 110. Reference numeral 112 denotes a recording / reproducing head, and 113 denotes a magnetic tape serving as a recording medium.

  An operation of reproducing a video signal recorded on the magnetic tape 113 by the recording apparatus will be described with reference to FIG.

  In accordance with the reproduction operation control of the controller 110, the capstan motor 111 is controlled to run the magnetic tape 113. Then, the recorded analog signal is taken out from the traveling magnetic tape 113 by the recording / reproducing head 112 mounted on the rotating drum. The extracted analog signal is demodulated by the modulation / demodulation unit 109, converted into original digital data, and stored in the ECC work memory 107.

  When the data accumulated in the ECC work memory 107 reaches the minimum unit of recording, that is, the ECC unit, the error correction unit 106 acquires the data for the ECC unit from the ECC work memory 107, performs error correction processing, and performs the ECC work memory 107. Process to write back to. The buffer management unit 104 transfers the data corresponding to the ECC unit, which has been subjected to error correction processing by the error correction unit 106 and written back to the ECC work memory 107, to the stream buffer 105. Such processing is sequentially repeated over the data for a plurality of ECC units to be reproduced.

  Next, the data stored in the stream buffer 105, that is, the MPEG stream, is read and decoded by the MPEG codec 103 and output to the VIDEO IN / OUT terminal 101 and the AUDIO IN / OUT terminal 102.

  Next, the recording operation will be described.

  In accordance with the operation control of the controller 110, the MPEG codec 103 encodes video and audio signals input from the VIDEO IN / OUT terminal 101 and the AUDIO IN / OUT terminal 102, and stores the MPEG stream in the stream buffer 105.

  When the data for the ECC unit is accumulated in the stream buffer 105, the buffer management unit 104 transfers the data for the ECC unit to the ECC work memory 107. When the data for the ECC unit is accumulated in the ECC work memory 107, the error correction unit 106 acquires the data for the ECC unit from the ECC work memory 107, performs the process for error correction, and returns to the ECC work memory 107 again. Write back. Such a process is sequentially repeated over data for a plurality of ECC units to be recorded.

  The data processed by the error correction unit 106 and accumulated in the ECC work memory 107 is read by the modulation / demodulation unit 109, modulated into an analog signal for recording, and recorded on the magnetic tape 113 by the recording / reproducing head 112. To be recorded.

  FIG. 7 is an example of a recording pattern on the magnetic tape 113 recorded by this recording apparatus.

  In the example of FIG. 7, the minimum unit of recording is 16 tracks, and the minimum unit of recording consisting of 16 tracks, that is, data corresponding to the ECC unit, is continuously recorded on the magnetic tape. Additional information is present at the beginning of each ECC unit. Further, the edit points shown in FIG. 7 indicate points at which new recording can be started from here.

  FIG. 8 is a diagram showing the structure of an ECC unit (16 track data) recorded on a magnetic tape. The data recorded on the tape is provided with an outer parity as shown in FIG. 8 in units of 16 tracks, which is the minimum recording unit. By performing error correction in units of ECC units, the presence or absence of errors is determined in units of ECC units. Therefore, this ECC unit is the minimum unit of recording.

  As shown in FIG. 8, video data (Video Data), audio data (Audio Data), and search data (Search Data) are stored in the ECC unit according to a predetermined rule. Further, additional information (system data) indicating various information in the ECC unit is prepared in the ECC unit. In the system data, information indicating the presence / absence of an edit point in the ECC unit and the position (track number and sync block number described later) of the edit point in the ECC unit are written. Furthermore, as information related to pictures recorded after the editing point, a DTS (Decode Time Stamp), a VBV_Delay value indicating a time during which one picture remains in the VBV buffer for decoding, and an encoding format such as 24p or 30p Information, field parity indicating whether the first frame in the display order is top field first or bottom field first, and information indicating the presence or absence of a redundant repeat field in the first frame in the display order are written in the system data. . The field parity is information indicating the field arrangement order of the first frame after the edit point.

  FIG. 9 is a diagram showing a data configuration in each track in FIG. The track is composed of 0 to 138 sync blocks (SyncBlock). Each sync block includes a sync (SYNC), ID0, ID1, and ID2, an outer parity (OuterParity) or data (DATA), and finally an inner parity (InnerParity). The IDs 0 to 2 include a track pair number indicating the track position in the ECC unit and a sync block number indicating the sync block position in the track. The error correction unit 106 performs error detection and correction for each ECC unit using the outer parity and the inner parity in the track.

  FIG. 10 shows an example in which a 60i or 30p video signal is input and recorded based on the recording operation described above by the recording apparatus of the present embodiment, and a 24p video signal that has been pulled down 2-3. It is a figure which shows the example when recorded.

  In the example of FIG. 10, in the case of 60i or 30p recording, an MPEG stream in which 15 frames are 1 GOP (Group Of Pictures) is set, and an edit point is set every 3 frames. On the other hand, in the case of 24p, the number of fields is converted by 2-3 pulldown, and a repeat field is inserted for each frame. Therefore, the original 12 frames are converted into 15 frames to be stream data that is 1 GOP, and edit points are set at intervals as shown in FIG.

  Next, an operation for connecting and recording new recording data on a recorded magnetic tape in the recording apparatus of the present embodiment will be described with reference to FIGS. Note that the flowchart of FIG. 11 illustrates a sequence of operation control performed by the controller 110.

  When the operation for continuous recording is started, the above-described reproduction operation is performed in order to search for an edit point from the recording data already recorded on the magnetic tape 113 (step S1101).

  Next, the controller 110 obtains the data after the error correction by the error correction unit 106 from the ECC work memory 107, and analyzes the additional information that exists for each reproduced minimum unit (ECC unit) (step S1102). ). As a result of analyzing the additional information of the ECC unit, if there is an editing point, the process proceeds to S1104, and if there is no editing point, the process returns to S1102 (step S1103). When the process returns to S1102, the same flow is repeated for the minimum recording unit (ECC unit) to be reproduced next.

  Next, when there is an edit point, the reproduction operation is stopped (step S1104). Then, the magnetic tape 113 is moved to return to the reproduction start position of the minimum recording unit (ECC unit) including the edit point (step S1105).

  Next, the reproduction operation is performed again to reproduce the ECC unit (data for 16 tracks) including the edit point, and the data is transferred from the ECC work memory 107 to the capture memory 108 and stored there (step). S1106). Then, the controller 110 reads the additional information of the ECC unit from the data held in the capture memory 108. Furthermore, the controller 110 edits the track number, sync block number, DTS, PTS, and VBV buffer amount in the ECC unit, the field parity of the first frame in the display order, the presence / absence of a repeat field in the first frame in the display order, Data relating to the conversion format is acquired (step S1107).

  Note that the steps up to this point may be automatically performed before an actual recording start instruction is given, such as when a recorded magnetic tape is loaded into the recording apparatus, or when the recording apparatus is started up by turning on the power. good.

  Next, the recording operation is started according to the recording instruction (step S1108). Next, the ECC unit data held in the capture memory 108 is transferred to the ECC work memory 107 (step S1109).

  Next, similarly to the recording operation described above, a video signal input for continuous recording is encoded by the MPEG codec 103 and stored in the stream buffer 105. Further, the buffer management unit 104 reads out the stream data stored in the stream buffer 105 and writes it continuously from the position of the track number and sync block number in the ECC unit held in S1106 in the ECC work memory 107. That is, recording of new stream data is started from the editing point of the ECC unit in the ECC work memory 107 (step S1110). Thereafter, the recorded data is subjected to error correction processing by the error correction unit 106, modulated by the modulation / demodulation unit 109, and then continuously recorded by the recording / reproducing head 112 following the recorded data on the magnetic tape 113. Is done.

  Further, the present invention can be realized by modifying the flowchart of FIG. 11 as shown in FIG. Hereinafter, the operation will be described with reference to FIGS. Note that the flowchart of FIG. 12 illustrates a sequence of operation control performed by the controller 110.

  When the operation for continuous recording is started, the above-described reproduction operation is performed in order to search for an edit point from the recording data already recorded on the magnetic tape 113 (step S1201).

  Next, the controller 110 acquires the data after the error correction by the error correction unit 106 from the ECC work memory 107, and analyzes the additional information existing for each reproduced minimum unit (ECC unit) (step S1202). ). As a result of analyzing the additional information of the ECC unit, if there is an editing point, the process proceeds to S1204, and if there is no editing point, the process returns to S1202 (step S1203).

  Next, as a result of analyzing the additional information of the ECC unit, if the first frame in the display order after the editing point is the top field first, the process proceeds to S1205; otherwise, the process returns to 1202 (step S1204).

  Next, as a result of analyzing the additional information of the ECC unit, if the stream data of the editing point is 24p recording, the process proceeds to S1206, and if not (60i or 30p), the process proceeds to S1207 (step S1205).

  Further, as a result of analyzing the additional information of the ECC unit, if the information indicating the presence / absence of a repeat field for the first frame in the display order after the edit point is a repeat field, the process proceeds to S1207. Otherwise, the process proceeds to S1202. Return (step S1206). When the process returns to S1202 again, the same flow is repeated for the minimum recording unit (ECC unit) to be reproduced next.

  Next, the reproduction operation is stopped (step S1207). Then, the magnetic tape 113 is moved to return to the reproduction start position of the minimum recording unit (ECC unit) including the edit point (step S1208).

  Next, the reproduction operation is performed again to reproduce the ECC unit (data for 16 tracks) including the edit point, and the data is transferred from the ECC work memory 107 to the capture memory 108 and stored there (step). S1209). Then, the controller 110 reads the additional information of the ECC unit from the data held in the capture memory 108. Further, the controller 110 acquires data relating to the track number, sync block number, DTS, PTS, and VBV buffer amount of the edit point in the ECC unit (step S1210).

  Note that the steps up to this point may be automatically performed before an actual recording start instruction is given, such as when a recorded magnetic tape is loaded into the recording apparatus, or when the recording apparatus is started up by turning on the power. good.

  Next, a recording operation is started in response to the recording instruction (step S1211). Next, the ECC unit data held in the capture memory 108 is transferred to the ECC work memory 107 (step S1212).

  Next, similarly to the recording operation described above, a video signal input for continuous recording is encoded by the MPEG codec 103 and stored in the stream buffer 105. Further, the buffer management unit 104 reads the data stored in the stream buffer 105 and writes the data continuously from the position of the track number and sync block number in the ECC unit held in S1209 in the ECC work memory 107. That is, recording of new stream data is started from the editing point of the ECC unit in the ECC work memory 107 (step S1213). Thereafter, the recorded data is subjected to error correction processing by the error correction unit 106, modulated by the modulation / demodulation unit 109, and then continuously recorded by the recording / reproducing head 112 following the recorded data on the magnetic tape 113. Is done.

  In this way, from the ECC unit including the edit point, the presence / absence of the field parity and repeat field of the first frame in the display order after the edit point and the encoding format thereof are analyzed first. As a result, when the encoding format of the edit point is 24p, continuous recording is started only when the top frame in the display order is top field first and there is information indicating the presence or absence of a redundant repeat field. Can do. In this way, normal continuous recording can be performed as in the example shown in FIG. 4D.

  As described above, by limiting the editing points according to the encoding format recorded on the magnetic tape, continuous stream data free from field item number errors and field omissions can be generated during continuous recording. Furthermore, it is possible to suppress the generation of a decoding time that does not normally occur at the editing point, and to generate continuous stream data that can be guaranteed to be decoded by a general decoder.

  In the above-described embodiment, in the case of the 60i or 30p encoding format, the first frame in the display order of the compressed encoded stream at the start of recording is top field first, and in the case of the 24p encoding format, It has been described that the first frame in the display order of the compressed encoded stream at the start of recording is top field first and that there is a repeat field at the start of recording. However, the present invention is not limited to this pattern, and can be similarly realized even when the top frame in the display order of the compressed encoded stream at the start of recording is bottom field first. In this case, it may be modified so that bottom field first is detected in S1204 of FIG.

  Next, a second embodiment of the present invention will be described. The configuration of the video signal recording apparatus according to the present embodiment is the same as that described above with reference to FIG.

  Subsequently, in the present embodiment, an operation of connecting and recording new recording data on a recorded magnetic tape will be described with reference to FIGS. Note that the flowcharts of FIGS. 13 and 14 illustrate the sequence of operation control performed by the controller 110.

  In the present embodiment, a new video can be recorded by connecting to an existing video while maintaining the continuity of the stream data. FIG. 13 is a flowchart for searching for an editing point on the magnetic tape 113, and FIG. 14 is a flowchart for a recording process that starts in response to a recording start instruction.

  In FIG. 13, recorded data on the magnetic tape 113 is reproduced in order to search for an edit point (step S1301).

  Next, the controller 110 acquires the data after the error correction by the error correction unit 106 from the ECC work memory 107, and analyzes the additional information existing for each reproduced minimum unit (ECC unit) (step S1302). ). As a result of analyzing the additional information of the ECC unit, if there is an editing point, the process proceeds to S1304, and if there is no editing point, the process returns to S1302 (step S1303). When the process returns to S1302, the same flow is repeated for the minimum recording unit (ECC unit) to be reproduced next.

  Next, when there is an edit point, the reproduction operation is stopped (step S1304). Then, the magnetic tape 113 is moved to return to the reproduction start position of the minimum recording unit (ECC unit) including the edit point (step S1305).

  Next, the reproduction operation is performed again to reproduce the ECC unit (data for 16 tracks) including the edit point, and the data is transferred from the ECC work memory 107 to the capture memory 108 and stored there (step). S1306). Then, the controller 110 reads the additional information of the ECC unit from the data held in the capture memory 108. Furthermore, the controller 110 edits the track number, sync block number, DTS, PTS, and VBV buffer amount in the ECC unit, the field parity of the first frame in the display order, the presence / absence of a repeat field in the first frame in the display order, Data related to the conversion format is acquired (step S1307).

  The above processing may be automatically performed before an actual recording start instruction is given, such as when a recorded magnetic tape is loaded into the recording apparatus, or when the system of the recording apparatus is turned on when the power is turned on. .

  Next, in FIG. 14, when there is an instruction to start recording, it is determined whether or not the encoding format of the edit point acquired in S1307 is 24p (step S1401). If it is 24p (YES in S1401), it is determined whether or not the encoding format of the newly recorded stream data is 24p (step S1402). In the present embodiment, 60i or 30p is assumed if it is not 24p.

  If the encoding format of the editing point is not 24p (NO in S1401) or the encoding format of the newly recorded stream data is 24p (YES in S1402), the ECC held in the capture memory 108 in S1306 The unit data is transferred to the ECC work memory 107 (step S1415).

  Next, similarly to the recording operation described above, a video signal input for continuous recording is encoded by the MPEG codec 103 and stored in the stream buffer 105. Further, the buffer management unit 104 reads the data stored in the stream buffer 105 and writes the data continuously from the position of the track number and sync block number in the ECC unit held in S1306 in the ECC work memory 107. That is, recording of new stream data is started from the editing point of the ECC unit in the ECC work memory 107 (step S1416). Thereafter, the recorded data is subjected to error correction processing by the error correction unit 106, modulated by the modulation / demodulation unit 109, and then continuously recorded by the recording / reproducing head 112 following the recorded data on the magnetic tape 113. Is done.

  Further, when the encoding format of the newly recorded stream data is not 24p (NO in S1402), that is, when the encoding format of the newly recorded video is 60i or 30p different from the encoding format of the editing point, It is determined from the field parity of the first frame in the display order after the edit point acquired in S1307 whether or not it is top field first (step S1403). If it is top field first (YES in S1403), it is determined from the additional information acquired in S1307 whether or not there is a repeat field in the first frame in the display order after the edit point (step S1404). If there is a repeat field (YES in S1404), the processes of S1415 and S1416 are executed as described above.

  If it is not top field first (NO in S1403), or if it is top field first (YES in S1403) and there is no repeat field (NO in S1404), the reproduction of the magnetic tape 113 is resumed (step S1405). Then, the data after the error correction by the error correction unit 106 is acquired from the ECC work memory 107, and the additional information existing for each minimum unit (ECC unit) of the reproduced recording is analyzed (step S1406).

  As a result of analyzing the additional information of the ECC unit in S1406, if there is an edit point, the process proceeds to S1408, and if there is no edit point, the process returns to S1406 (step S1407).

  Next, as a result of analyzing the additional information of the ECC unit in S1406, if the editing point is 24p, the process proceeds to S1409, and if not, the process proceeds to 1411 (step S1408).

  Next, as a result of analyzing the additional information of the ECC unit in S1406, if the field parity of the first frame in the display order after the editing point is the top field first, the process proceeds to S1410, and if not, the process returns to 1406 (step S1409). ).

  Further, as a result of analyzing the additional information of the ECC unit in S1406, if the information indicating the presence / absence of the repeat field of the first frame in the display order after the edit point is a repeat field, the process proceeds to S1411. Otherwise, the process proceeds to S1406. Return (step S1410). If the process returns to S1406 again, the same flow is repeated for the minimum recording unit (ECC unit) to be reproduced next.

  Next, the reproduction operation is stopped (step S1411). Then, the magnetic tape 113 is moved to return to the reproduction start position of the minimum recording unit (ECC unit) including the edit point analyzed in S1406 (step S1412).

  Next, the reproduction operation is performed again to reproduce the ECC unit (data for 16 tracks) including the edit point, and the data is transferred from the ECC work memory 107 to the capture memory 108 and stored there (step). S1413). Then, the controller 110 reads the additional information of the ECC unit from the data held in the capture memory 108. Furthermore, the controller 110 edits the track number, sync block number, DTS, PTS, VBV buffer amount in the ECC unit, field parity of the first frame in the display order, presence / absence of a repeat field in the first frame in the display order, and encoding. Data related to the format is acquired (step S1414).

  After S1414, the digital data held in the capture memory 108 in S1413 is transferred to the ECC work memory 107 (step S1415).

  Then, by the same operation as described above, the video signal input for continuous recording is encoded by the MPEG codec 103 and stored in the stream buffer 105. Further, the buffer management unit 104 reads out the data stored in the stream buffer 105 and writes the data continuously from the position of the track number and sync block number in the ECC unit held in S1413 in the ECC work memory 107. That is, recording of new stream data is started from the editing point of the ECC unit in the ECC work memory 107 (step S1416). Thereafter, the recorded data is subjected to error correction processing by the error correction unit 106, modulated by the modulation / demodulation unit 109, and then continuously recorded by the recording / reproducing head 112 following the recorded data on the magnetic tape 113. Is done.

  In this way, in this embodiment, when the encoding format is different before and after the detected editing point, the fields are connected in the correct order, so that connection recording is performed without any field item number error or time stamp continuous error. Can do. That is, normal continuous recording can be performed as in the example shown in FIG. 4D.

  In the above description, it is checked whether or not the encoding format of the edit point is 24p, but it may be checked whether it is 60i or 30p. In this case, it is determined whether or not the field parity is bottom field first.

  In the above description, in 60i or 30p, the top field first frame is the top frame, and in 24p, the top field first frame with the repeat field is the top frame. However, in 60i or 30p, a frame that is bottom field first may be the top frame, and in 24p, a frame that is bottom field first and has a repeat field may be the top frame. When changing in this way, S1403 and S1409 in FIG. 14 may be changed so as to determine whether or not bottom field first.

  Next, a third embodiment of the present invention will be described. The configuration of the video signal recording apparatus according to the present embodiment is the same as that described above with reference to FIG.

  Subsequently, in the present embodiment, an operation of connecting and recording new recording data on a recorded magnetic tape will be described with reference to FIGS. Note that the flowchart of FIG. 15 illustrates a sequence of operation control performed by the controller 110.

  Note that the flowchart of FIG. 15 is obtained by partially changing the flowchart shown in FIG. 14, and includes steps S1505 and S1506 instead of steps S1405 to S1414 of FIG.

  FIG. 16 shows an example of recording on a magnetic tape before and after stream discontinuous recording in this embodiment.

  In FIG. 15, when there is an instruction to start recording, it is determined whether or not the encoding format of the edit point acquired in S1307 in FIG. 13 is 24p (step S1501). If it is 24p (YES in S1501), it is determined whether or not the encoding format of the newly recorded stream data is 24p (step S1502). In the present embodiment, 60i or 30p is assumed if it is not 24p.

  If the encoding format of the edit point is not 24p (NO in S1501) or the encoding format of the newly recorded stream data is 24p (YES in S1502), the ECC stored in the capture memory 108 in S1306 Unit data is transferred to the ECC work memory 107 (step S1507).

  Next, similarly to the recording operation described above, a video signal input for continuous recording is encoded by the MPEG codec 103 and stored in the stream buffer 105. Further, the buffer management unit 104 reads the data stored in the stream buffer 105 and writes the data continuously from the position of the track number and sync block number in the ECC unit held in S1306 in the ECC work memory 107. That is, recording of new stream data is started from the editing point of the ECC unit in the ECC work memory 107 (step S1508). Thereafter, the recorded data is subjected to error correction processing by the error correction unit 106, modulated by the modulation / demodulation unit 109, and then continuously recorded by the recording / reproducing head 112 following the recorded data on the magnetic tape 113. Is done.

  Also, when the encoding format of the newly recorded stream data is not 24p (NO in S1502), that is, when the encoding format of the newly recorded video is 60i or 30p different from the encoding format of the editing point, It is determined from the field parity of the first frame in the display order after the edit point acquired in S1307 whether or not it is top field first (step S1503). If it is top field first (YES in S1503), it is determined from the additional information acquired in S1307 whether or not there is a repeat field in the first frame in the display order after the edit point (step S1504). If there is a repeat field (YES in S1504), the processes of S1507 and S1508 are executed as described above.

  If it is not top field first (NO in S1503), or if it is top field first (YES in S1503) and there is no repeat field in the top frame (NO in S1504), the process proceeds to S1505.

  Subsequently, the contents stored in the capture memory 108 are discarded (step S1505), and recording with stream discontinuity is started (step S1506). In other words, when this state is reached, the continuous recording for making continuous stream data is not executed, but the recording that makes the stream discontinuous is executed.

  Here, the stream discontinuous recording will be described with reference to FIGS. 1 and 16. When the controller 110 instructs the start of recording with stream discontinuity, the buffer management unit 104 transfers invalid data for ECC units to the ECC work memory 107. At the same time, the signals from the VIDEO IN / OUT terminal 101 and the AUDIO IN / OUT terminal 102 are compression-coded by the MPEG codec 103 and the MPEG stream starts to be accumulated in the stream buffer 105. When the data for the ECC unit is accumulated in the ECC work memory 107, the error correction unit 106 reads the data from the ECC work memory 107, performs error correction processing, and writes it back to the ECC work memory 107. When the data corrected by the error correction unit 106 is accumulated in the ECC work memory 107, the modulation / demodulation unit 109 reads invalid data for N (for example, 5) ECC units from the ECC work memory 107. Then, it is modulated and recorded on the magnetic tape 113.

  When transfer and recording of invalid data for N ECC units are completed, the buffer management unit 104 sequentially transfers the MPEG stream stored in the stream buffer 105 to the ECC work memory 107 for each ECC unit. Thereafter, the recording process is performed in the same manner as described above.

  As described above, in this embodiment, when the encoding format is different before and after the editing point, new video signals can be continuously recorded after the invalid data is inserted and recorded.

  Next, a fourth embodiment of the present invention will be described. The configuration of the video signal recording apparatus according to the present embodiment is the same as that described above with reference to FIG.

  Next, in the present embodiment, an operation of connecting and recording new recording data on a recorded magnetic tape will be described with reference to FIGS. Note that the flowchart in FIG. 17 illustrates a sequence of operation control performed by the controller 110.

With reference to FIG. 17, an edit point detection method suitable for continuous recording will be described. FIG. 17 is a flowchart of an edit point detection method suitable for connection recording.

  In FIG. 17, in order to search for an edit point, the recorded data on the magnetic tape 113 is reproduced (step S1701).

  Next, the controller 110 obtains the data after the error correction by the error correction unit 106 from the ECC work memory 107, and analyzes the additional information that exists for each reproduced minimum unit (ECC unit) (step S1702). ). As a result of analyzing the additional information of the ECC unit, if there is an editing point, the process proceeds to S1704, and if there is no editing point, the process returns to S1702 (step S1703).

  Next, it is determined whether or not the encoding format of newly recorded stream data is 24p (step S1704). In S1704, if the stream data to be newly recorded is 24p, the process proceeds to S1708, and if not, the process proceeds to S1705. In the present embodiment, 60i or 30p is assumed if it is not 24p.

  Next, as a result of analyzing the additional information of the ECC unit, if the stream data at the editing point is 24p, the process proceeds to S1706, and if not, the process proceeds to S1707 (step S1705).

  Next, as a result of analyzing the additional information of the ECC unit, if the information indicating the presence / absence of the repeat field of the first frame in the display order after the edit point is the presence of the repeat field, the process proceeds to S1707; otherwise, the process proceeds to S1702. Return to (step S1706).

  Further, as a result of analyzing the additional information of the ECC unit, if the field parity of the first frame in the display order after the editing point is top field first, the process proceeds to S1708; otherwise, the process returns to S1702 (step S1707). When returning to S1702 again, the same flow is repeated for the minimum recording unit (ECC unit) to be reproduced next.

  Eventually, when the encoding format of the newly recorded video is 24p (YES in S1704), the edit point detected first is adopted. When the encoding format of the newly recorded video is 60i or 30p (NO in S1704) and the encoded format of the recorded video is 24p (YES in S1705), the recorded video is displayed. When the first frame in the sequence has a repeat field (YES in S1706) and is top field first (YES in S1707), the edit point is adopted. If either one of S1706 and S1707 does not satisfy the condition, another editing point is examined.

  In addition, when the encoding format of the newly recorded video is 60i or 30p (NO in S1704) and the encoded format of the recorded video is 60i or 30p (NO in S1705), the recording is completed. When the first frame in the video display order is top field first (YES in S1707), the edit point is adopted. If it is not top field first (NO in S1707), another editing point is considered.

  Next, the reproduction operation is stopped (step S1708). Then, the magnetic tape 113 is moved to return to the reproduction start position of the minimum recording unit (ECC unit) including the edit point (step S1709).

  Next, the reproduction operation is performed again to reproduce the ECC unit (data for 16 tracks) including the edit point, and the data is transferred from the ECC work memory 107 to the capture memory 108 and stored there (step). S1710). Then, the controller 110 reads the additional information of the ECC unit from the data held in the capture memory 108, and edits the track number of the edit point in the ECC unit, the sync block number, the DTS, the PTS, the VBV buffer amount, and the first frame in the display order. Field parity, presence / absence of redundant repeat fields in the first frame in the display order, and data relating to the encoding format are acquired (step S1711).

  Note that the steps up to this point may be automatically performed before an actual recording start instruction is given, such as when a recorded magnetic tape is loaded into the recording apparatus, or when the recording apparatus is started up by turning on the power. good.

  Next, a recording operation is started according to the recording instruction (step S1712). Next, the ECC unit data held in the capture memory 108 is transferred to the ECC work memory 107 (step S1713).

  Next, similarly to the recording operation described above, a video signal input for continuous recording is encoded by the MPEG codec 103 and stored in the stream buffer 105. Further, the buffer management unit 104 reads out the data stored in the stream buffer 105 and writes the data continuously from the position of the track number and sync block number in the ECC unit held in S1710 in the ECC work memory 107. That is, recording of new stream data is started from the editing point of the ECC unit in the ECC work memory 107 (step S1714). Thereafter, the recorded data is subjected to error correction processing by the error correction unit 106, modulated by the modulation / demodulation unit 109, and then continuously recorded by the recording / reproducing head 112 following the recorded data on the magnetic tape 113. Is done.

  In this way, normal continuous recording can be performed as in the example shown in FIG. 4D.

  In the above description, it is checked whether or not the encoding format of the edit point is 24p, but it may be checked whether it is 60i or 30p. In this case, it is determined whether or not the field parity is bottom field first.

  In this manner, in the present embodiment, edit points suitable for connection recording can be detected, and connection recording can be performed from the detected position.

1 is a block diagram of a video signal recording apparatus according to a first embodiment of the present invention. It is a figure which shows a mode when 24p video signal and 60i or 30p video signal are recorded on a magnetic tape. It is a figure explaining 2-3 pulldown. (A) and (B) are examples of edit points where connection recording is impossible due to field item number errors, (C) is an example of edit points where connection recording is not possible due to time stamp continuity errors, and (D) Is an example of an edit point that enables normal connection recording. (A), (B) is a figure explaining a field item number error. It is a figure explaining the case where incorrect decoding time generate | occur | produces. It is a figure which shows the recording pattern on a magnetic tape. It is a figure which shows the structure of the ECC unit (16 track data) recorded on a magnetic tape. It is a figure which shows the structure of the data in each track | truck in FIG. It is an example when it records with a video signal recording device. It is a flowchart explaining the joint recording operation | movement in the 1st Embodiment of this invention. It is a flowchart explaining another connection recording operation in the 1st Embodiment of this invention. It is a flowchart explaining the operation | movement of the edit point search in the 2nd Embodiment of this invention. It is a flowchart explaining the joint recording operation | movement in the 2nd Embodiment of this invention. It is a flowchart explaining the joint recording operation | movement in the 3rd Embodiment of this invention. It is a figure explaining the stream discontinuous recording in the 3rd Embodiment of this invention. It is a flowchart explaining the joint recording operation | movement in the 4th Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Memory part 101 VIDEO IN / OUT terminal 102 AUDIO IN / OUT terminal 103 MPEG codec (encoding / decoding circuit)
104 Buffer management unit 105 Stream buffer 106 Error correction unit 107 ECC work memory 108 Capture memory 109 Modulation / demodulation unit 110 Controller (control unit)
111 Capstan motor 112 Recording / reproducing head 113 Magnetic tape

Claims (14)

A video signal recording apparatus for recording unit data obtained by unitizing stream data on the basis of an error correction processing unit on a tape-shaped recording medium,
Recording means for recording the unit data on the recording medium;
Detecting means for detecting additional information included in the unit data recorded on the recording medium;
Analyzing the additional information detected by the detecting means, and obtaining at least information indicating the presence / absence of edit points at which connection recording is possible, field arrangement order, and presence / absence of repeat fields;
A connection recording control means for controlling an operation of connecting and recording unit data consisting of second stream data on the recording medium on which unit data consisting of first stream data is recorded;
When performing joint recording, the joint recording control unit determines an edit point for joint recording based on information acquired by the analyzing unit with respect to the unit data including the first stream data, and the determined editing is performed. A video signal recording apparatus, wherein unit data in which the second stream data is recorded is generated from a position based on a point and recorded by the recording means. When the first stream data is in an interlace format of 60 fields / second or a progressive format of 30 frames / second, the joint recording control means records the edit points that can be edited from a frame that is top field first. Decided to edit points to
When the first stream data is in a progressive format of 24 frames / second, an edit point that is top field first and can be edited from a frame having a repeat field is determined as the start point of the continuous recording. The video signal recording apparatus according to claim 1. When the first stream data is in the interlace format of 60 fields / second or the progressive format of 30 frames / second, the joint recording control means records the edit points that can be edited from the bottom field first frame. Decided to edit points to
When the first stream data is in a progressive format of 24 frames / second, an edit point that is bottom field first and is editable from a frame having a repeat field is determined as the start point of the continuous recording. The video signal recording apparatus according to claim 1.   2. The unit data is a minimum unit of recording on the recording medium, and the recording unit records the unit data on a specific number of tracks continuously formed on the recording medium. The video signal recording apparatus as described. A video signal recording apparatus for recording unit data obtained by unitizing stream data on the basis of an error correction processing unit on a tape-shaped recording medium,
Recording means for recording the unit data on the recording medium;
Detecting means for detecting an editing point that enables continuous recording from unit data recorded on the recording medium;
Analyzing means for analyzing information relating to the field arrangement order and the presence or absence of repeat fields related to the edit points detected by the detecting means;
First determination means for determining whether or not the stream data relating to the edit point detected by the detection means is in a progressive format of 24 frames / second;
Second determination means for determining whether or not stream data to be newly recorded is in a progressive format of 24 frames / second;
When the determination result of the first determination unit is in a progressive format of 24 frames / second and the determination result of the second determination unit is not in a progressive format of 24 frames / second, the contents analyzed by the analysis unit Video signal recording, comprising: a linkage recording control means for deciding whether to newly record the stream data to be newly recorded from a position based on the editing point detected by the detection means based on apparatus.   When the determination result of the first determination unit is in a progressive format of 24 frames / second and the determination result of the second determination unit is not in a progressive format of 24 frames / second, When it is determined by the analysis means that the field arrangement order is top field first and has a repeat field, the stream data to be newly recorded is connected and recorded from the edit point detected by the detection means. 6. The video signal recording apparatus according to claim 5, wherein   When the determination result of the first determination unit is in a progressive format of 24 frames / second and the determination result of the second determination unit is not in a progressive format of 24 frames / second, When the field arrangement order is top field first by the analyzing unit and it is not determined that the field has a repeat field, the stream data to be newly recorded from the editing point different from the editing point detected by the detecting unit 6. The video signal recording apparatus according to claim 5, wherein the video signal recording apparatus is connected and recorded.   When the determination result of the first determination unit is in a progressive format of 24 frames / second and the determination result of the second determination unit is not in a progressive format of 24 frames / second, When the analysis unit determines that the field arrangement order is bottom field first and has a repeat field, the stream data to be newly recorded is connected and recorded from the edit point detected by the detection unit. 6. The video signal recording apparatus according to claim 5, wherein   When the determination result of the first determination unit is in a progressive format of 24 frames / second and the determination result of the second determination unit is not in a progressive format of 24 frames / second, If the field arrangement order is bottom field first by the analysis means and it is not determined that the field has a repeat field, the stream data to be newly recorded from the edit point different from the edit point detected by the detection means 6. The video signal recording apparatus according to claim 5, wherein the video signal recording apparatus is connected and recorded.   When the determination result of the first determination unit is not in a progressive format of 24 frames / second, or the determination result of the first determination unit is in a progressive format of 24 frames / second, When the determination result of the second determination unit is a progressive format of 24 frames / second, the stream data to be newly recorded is connected and recorded from the edit point detected by the detection unit. Item 6. A video signal recording apparatus according to Item 5.   6. The unit data is a minimum unit of recording on the recording medium, and the recording unit records the unit data on a specific number of tracks continuously formed on the recording medium. The video signal recording apparatus as described. A video signal recording apparatus for recording unit data obtained by unitizing stream data on the basis of an error correction processing unit on a tape-shaped recording medium,
Recording means for recording the unit data on the recording medium;
Detecting means for detecting an editing point that enables continuous recording from unit data recorded on the recording medium;
Analyzing means for analyzing information relating to the field arrangement order and the presence or absence of repeat fields related to the edit points detected by the detecting means;
First determination means for determining whether or not the stream data relating to the edit point detected by the detection means is in a progressive format of 24 frames / second;
Second determination means for determining whether or not stream data to be newly recorded is in a progressive format of 24 frames / second;
When the determination result of the first determination means is in a progressive format of 24 frames / second and the determination result of the second determination means is not in a progressive format of 24 frames / second, the contents analyzed by the analysis means A connection recording control means for determining whether or not to confirm the edit point detected by the detection means as an edit point for connection recording, and if not determined, a connection record control means for controlling to detect the next edit point; A video signal recording apparatus comprising: A video signal recording apparatus for recording unit data obtained by unitizing stream data on the basis of an error correction processing unit on a tape-shaped recording medium,
Recording means for recording the unit data on the recording medium;
Detecting means for detecting an editing point that enables continuous recording from unit data recorded on the recording medium;
Analyzing means for analyzing information relating to the field arrangement order and the presence or absence of repeat fields related to the edit points detected by the detecting means;
First determination means for determining whether or not the stream data relating to the edit point detected by the detection means is in a progressive format of 24 frames / second;
Second determination means for determining whether or not stream data to be newly recorded is in a progressive format of 24 frames / second;
When the determination result of the first determination means is in a progressive format of 24 frames / second and the determination result of the second determination means is in a progressive format of 24 frames / second, the contents analyzed by the analysis means The linkage recording control means for determining whether to newly record the stream data to be newly recorded from the position based on the edit point detected by the detection means or to perform discontinuous recording by inserting invalid data And a video signal recording apparatus. When the discontinuous recording is performed, the recording unit records N unit data indicating the invalid data, and then records unit data including the stream data to be newly recorded. Item 14. A video signal recording apparatus according to Item 13.

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