JP2006324739A - Coded data reproducing apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a coded data reproducing apparatus smoothly reproducing video data even when the reproduction by the PAL or the NTSC is fixed to the reproducing apparatus when reproducing the data coded by the MPEG4 or the like. <P>SOLUTION: The reproducing apparatus determines a broadcast system in coding according to the interval between decoded frames, outputs a video signal by the video output broadcast system so as to smoothly display the video image when reproducing the data coded by the MPEG4 or the like. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an encoded data reproduction apparatus that reproduces data encoded in MPEG4 or the like.

  In the encoded data reproducing apparatus, the transmission side multiplexing unit transmits a selection signal indicating the television broadcasting system on the transmission side to the encoded data and transmits the encoded data, and the reception side transmits the selection signal added to the reception data from the transmission side. The TV broadcasting system is determined, and the broadcast processing system of the readout circuit with NTSC / PAL switching, the analog circuit with NTSC / PAL switching, and the display with NTSC / PAL switching is switched according to the television broadcasting system of the transmission side, and the received signal There is a system for processing the data by the broadcast system on the transmission side (see, for example, Patent Document 1).

  However, some decoding LSIs such as MPEG4 cannot be used to read the selection signal described above. This case will be described with reference to FIGS. FIG. 5 is a block diagram showing a configuration of a conventional encoded data reproducing apparatus. The memory card 1 outputs encoded video data 2. Decoding means 3 decodes encoded video data 2 and outputs frame data 4. The display control means 20 creates the video signal 11 from the frame data 4 based on the video output broadcast system initial setting value 19. Here, it is assumed that the video output broadcast system initial setting value 19 is set to NTSC. The monitor 12 displays an image based on the video signal 11.

  When the original image of the encoded video data is PAL, the frame interval of the output of the decoding means 3 is 40 ms, the same as the PAL frame interval. On the other hand, the output frame interval of the display control means 10 is 33 ms, which is the NTSC frame interval. In this way, the display control means 10 outputs a video signal only in the NTSC broadcasting system set by the video output broadcasting system initial setting value 19, and cannot be switched based on the broadcasting system of the data to be decoded.

FIG. 6 is a diagram showing a frame at the time of encoding and a frame output at the time of decoding in the conventional encoded data reproducing apparatus. Since the input at the time of encoding is a PAL signal, it is recorded as data of 25 frames per second. On the other hand, if playback is fixed to NTSC, 30 frames of output per second are required. Therefore, by inserting the same frame every 5 frames, the missing frame is compensated.
Japanese Patent Publication No. 7-59084

  However, the above-described conventional configuration has a problem that the number of frames is converted because the broadcast system at the time of encoding is different from the video output broadcast system after decoding, and the reproduced video does not become a smooth video. It was.

  SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems, and an object thereof is to provide an encoded data reproducing apparatus that enables smooth video reproduction.

  In order to achieve this object, the encoded data reproducing apparatus of the present invention decodes encoded data and outputs frame data, and displays and outputs a frame from header information output from the decoding means. A frame interval measuring means for extracting a time stamp indicating timing and measuring a frame interval from a time stamp difference between frames; and a video output broadcast system determining means for determining a video output broadcast system based on an output of the frame interval measuring means. And a display control means for receiving the output of the decoding means and outputting a video signal based on the output of the video output broadcast system determination means.

  With this configuration, an encoded data reproduction device that enables smooth video reproduction can be obtained.

  As described above, the present invention provides an excellent effect that a smooth video can be displayed when data encoded in MPEG4 or the like is reproduced.

(Embodiment 1)
Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is a block diagram showing a configuration of an encoded data reproduction apparatus according to Embodiment 1 of the present invention. The memory card 1 outputs encoded video data 2. Decoding means 3 decodes encoded video data 2 and outputs frame data 4. The frame interval measuring means 5 receives the frame data 4 and extracts the time stamp of each frame to detect each frame interval. The video output broadcast system determination means 8 determines the broadcast system based on the frame interval.

  FIG. 2 is a diagram showing the relationship between the broadcasting system and the number of frames at the time of recording / playback.

  FIG. 2A shows a case where a plurality of modes can be selected according to the number of frames per second for NTSC and PAL. For example, when recording to the memory card 1, extra fine, super fine, fine, normal, and economy modes are provided for NTSC and PAL, respectively. This allows the user to select a preferred mode for recording time and resolution.

  FIG. 2B shows the relationship between the number of frames or the frame interval during reproduction and the broadcasting system. Thereby, it is possible to select the most suitable broadcasting system at the time of reproduction from the frame interval.

  FIG. 3 is a flowchart of the operation of the video output broadcast system determination means 8. In step S301, it is determined whether the frame interval is close to 33 ms. In the case of Yes, it progresses to step S302. In step S302, it is determined that the broadcast system is NTSC and the number of frames is 30. If no, the process proceeds to step S303. In step S303, it is determined whether the frame interval is close to 40 ms. In the case of Yes, it progresses to step S304. In step S304, it is determined that the broadcast system is PAL and the number of frames is 25. If no, the process proceeds to step S305. In step S305, it is determined whether the frame interval is close to 67 ms. In the case of Yes, it progresses to step S306. In step S306, it is determined that the broadcast system is NTSC and the number of frames is 15. If no, the process proceeds to step S307. In step S307, it is determined whether the frame interval is close to 83 ms. In the case of Yes, it progresses to step S308. In step S308, it is determined that the broadcast system is PAL and the number of frames is 12. If no, the process proceeds to step S309. In step S309, it is determined whether the frame interval is close to 167 ms. In the case of Yes, it progresses to step S310. In step S310, it is determined that the broadcast method is PAL and the number of frames is six. In the case of No, it ends without determining. The display control means 10 creates the video signal 11 from the frame data 4 based on the video output broadcast system determination value 9. The monitor 12 displays an image based on the video signal 11.

  FIG. 4 is a diagram showing a frame at the time of encoding and a frame output at the time of decoding in Embodiment 1 of the present invention. This shows a case where the broadcast system at the time of encoding is PAL, the frame interval is 40 ms, and the video output broadcast system determination value 9 indicates PAL. Although not shown in the figure, when the broadcast system is NTSC, the frame interval is 33 ms, and the video output broadcast system determination value 9 is NTSC. Thus, the video decoded by the same video output broadcasting system as the original encoding broadcasting system can be output according to the frame interval, and a smooth video can be output.

  As described above, according to the first embodiment, the broadcast system at the time of encoding is determined from the interval between the decoded frames, and the video signal is output by the video output broadcast system. Smooth video can be displayed when playing back data.

  The encoded data reproducing apparatus of the present invention has an excellent effect that it can display a smooth video when reproducing data encoded in MPEG4 or the like. This is useful in an encoded data reproduction device or the like that reproduces.

1 is a block diagram showing a configuration of an encoded data reproduction device according to Embodiment 1 of the present invention. The figure which shows the relationship between the broadcasting system and the number of frames during recording / playback Flowchart of the operation of the video output broadcast system determination means 8 The figure which shows the flame | frame output at the time of the encoding at the time of Embodiment 1 of this invention, and decoding The block diagram which shows the structure of the conventional encoded data reproduction | regeneration apparatus. The figure which shows the flame | frame output at the time of the encoding at the time of the encoding in the conventional encoded data reproduction | regeneration apparatus, and a decoding

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Memory card 2 Encoded video data 3 Decoding means 4 Frame data 5 Frame interval measurement means 6 Frame interval 8 Video output broadcast system determination means 9 Video output broadcast system determination value 10 Display control means 11 Video signal 12 Monitor 13 Frame

Claims (1)

Decoding means for decoding the encoded data and outputting frame data; and extracting a time stamp indicating the display output timing of the frame from the header information of the output of the decoding means; A frame interval measuring means for measuring an interval; a video output broadcast system determining means for determining a video output broadcast system based on an output of the frame interval measuring means; and an output of the decoding means for inputting the video output broadcast system determination And a display control means for outputting a video signal based on the output of the means.

Images