Motion video signal processing for recording or reproducing – Local trick play processing – With randomly accessible medium
Patent
1995-10-31
2000-06-13
Tran, Thai
Motion video signal processing for recording or reproducing
Local trick play processing
With randomly accessible medium
386 69, 386 68, 386111, 386125, H04N 592
Patent
active
060759208
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a data recording method and apparatus, a data recording medium, and a data reproducing method and apparatus. The present invention may be applicable, for example, to a method and an apparatus for recording and reproducing video data, audio data, caption data, and data composed of a plurality of these data as well as data produced on a computer in accordance with the stipulation of ISO11172 (MPEG1) or ISO13818 (MPEG2).
BACKGROUND ART
Heretofore, a data recording medium such as a compact disc (a trade mark) has additional information data (subcode) recorded thereon for realizing random access, in addition to information to be primarily reproduced. The information to be primarily reproduced is subjected to a mechanism for correcting errors with information located before and behind the errors. Specifically, CIRC (Cross Interleaved Reed-Solomon Code) or the like is added to the information for countermeasures to such errors.
Thus, data can be utilized only after the lapse of a time required to read data before and behind certain data for performing the error correction processing and a time required to calculations for the error correction. Essentially, unlike reproducible data, the additional information data is required to be utilized in a shorter time after it is read from a data recording medium, so that the error correction processing is not performed for the additional information data, or different error correction processing with a different calculation method from that for data to be primarily reproduced is employed for the additional information data.
As additional information data for randomly accessing a data recording medium, the most necessary data is information indicative of the position of data on the data recording medium, i.e., the address. Since the compact disc or the like is a data recording medium which was originally created for recording audio data and is characterized in that information is recorded at a fixed bit rate, information (address) for specifying each readout unit (sector) on the data recording medium is represented by a numerical value based on the hour, minute, second and frame, i.e., information (time code) on reproduction passing time from the head of reproduced data.
Due to the characteristic of the compact disc that information is recorded at a fixed bit rate, audio data reproduction passing time information (time code) on the disc increases in proportion to an increase in the distance (address) of data from the head position thereof on the data recording medium, i.e., the disc. Consequently, designation of a particular read-out unit (sector) on the data recording medium may also be realized by specifying the reproduction passing time represented by hour, minute, second and frame.
However, since this address based on hour, minute, second and frame is denoted based on a 60-adic number or a 75-adic number utilizing the number of frames per second, this address cannot be used as it is for a data recording medium used by a computer system which basically specifies addresses with binary codes (which may be denoted in hexadecimal). Thus, the MD (Mini-Disc (a trade mark)) standard and so on employ a binary form as the address for specifying a sector. In this case, although a search cannot be made directly with reproduction passing time information (time code), since information is recorded at a fixed bit rate on the mini-disc and so on, conversion from a binary-form sector address to the reproduction passing time information (time code) can be realized by a proportional calculation.
However, if the bit rate of information varies, the correspondence between the conventional reproduction passing time information represented by hour, minute, second and the number of frames and a sector address cannot be calculated. With a varying bit rate, even if the time code was used as a second address, the rate of increase in the reproduction passing time information (time code) would be different between a higher bit rate portion and a l
REFERENCES:
patent: 5598276 (1997-01-01), Cookson et al.
patent: 5602956 (1997-02-01), Suzuki et al.
patent: 5614938 (1997-03-01), Sugiyama et al.
Fujinami Yasushi
Kawamura Makoto
Frommer William S.
Smid Dennis M.
Sony Corporation
Tran Thai
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