Motion video signal processing for recording or reproducing – Local trick play processing – With randomly accessible medium
Reexamination Certificate
1999-12-10
2001-11-13
Nguyen, Huy (Department: 2615)
Motion video signal processing for recording or reproducing
Local trick play processing
With randomly accessible medium
C386S349000, C386S349000
Reexamination Certificate
active
06317557
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a digital signal recording method and recording apparatus and a recording medium therefor. More specifically this invention relates to a digital signal recording method and apparatus for recording a plurality of different sorts of normal reproduction digital signals and special reproduction digital signals on a tape-form recording medium by use of a rotary head, and a recording medium used for the digital signal recording method and apparatus.
In general, when digital signals are recorded in unit of data block on and reproduced from a tape-form recording medium such a magnetic tape by use of a rotary head. There is a case that a trick play reproduction (special reproduction) such that digital signals are reproduced at a speed different from the speed at which the digital signals are recorded. The data recorded for the normal reproduction are reproduced discontinuously at certain time intervals in this case. Because the scanning pattern of the rotary head on the tape-form recording medium is different from that obtained when the digital signals are reproduced in the normal reproduction. It is thus difficult to obtain the trick play reproduction signals without any additional processing.
Therefore, conventionally, there has been known a digital signal recording method for enabling the special reproduction as disclosed in Japanese Patent-Laid Open No. 1994-261278. This teaches that digital signals for the special reproduction are arranged and recorded on tracks on which normal reproduction digital signals are recorded along the rotary head scanning pattern obtained in the special reproduction.
In such a digital signal recording method, the recording format of the digital signals recorded on each track of a tape-form recording medium is kept constant. It is thus impossible to record digital signals of desired systems in various formats (e.g., such a format that a plurality of data areas are arranged on a single track so that digital signals can be recorded and reproduced independently) by use of a signal apparatus.
In addition, there is a case where the digital signals for the normal reproduction and the special reproduction are recorded on the recording medium under mixed conditions. The data rate of the special reproduction digital signals and the arrangement positions of the special reproduction digital signals in this case are different from each other. Because the recording formats of the digital signals are different from each other. There arises a problem in that a circuit for forming the special reproduction digital signals and a circuit for recording the special reproduction digital signals at specific positions on the tape-form recording medium are both complicated in circuit construction.
SUMMARY OF THE INVENTION
With these problems in mind, therefore, it is an object of the present invention to provide a digital signal recording method and apparatus and a recording medium used therefor, by which the normal reproduction digital signals and the special reproduction digital signals can be recorded in accordance with mutually different formats under mixed conditions.
Further, another object of the present invention is to provide a digital signal recording method and apparatus and a recording medium used therefor, by which when the normal reproduction digital signals and the special reproduction digital signals are recorded on a recording medium under mixed conditions, the circuits for forming and recording the special reproduction digital signals can be simplified in circuit construction, in spite of the fact that the recording track format systems are different from each other.
To achieve the above-mentioned object, the present invention provides a method for recording digital signals in sequential tracks on a tape-form recording medium, comprising the steps of: in the case where the digital signals are recorded in accordance with a first recording format, recording at least first digital signals for normal reproduction in a single area of the first format on each track; in the case where the digital signals are recorded in accordance with at least a second recording format, recording at least the first digital signals in a specific area among a plurality of divided areas of the second format, the divided areas being rewritable independently on each track, the specific area being common for both the first and second formats; and recording second digital signals for special reproduction in previously determined areas among recording areas on each track, the recording areas being common for both the first and second formats.
The method may further comprise the steps of: selecting either the first or the second digital signals according to a data rate of the first digital signals; and recording the selected digital signals in the previously determined areas.
The method may further comprise the steps of: detecting the data rate of the first digital signals; and selecting the first digital signals when the detected data rate becomes higher than a predetermined data rate.
Further, the present invention provides an apparatus for recording digital signals in sequential tracks on a tape-form recording medium, comprising: first selecting means for selecting either first digital signals for normal reproduction or second digital signals for special reproduction according to a data rite of the first digital signals; adding means, in the case where the digital signals are recorded in accordance with at least a first recording format, for addina a header indicating at least previously determined areas among recording areas on each track to a data block of the selected digital signals and to auxiliary data to be recorded on an area other than a plurality of divided areas of the first format, the recording areas being common for the first recording format and a second recording format, the divided areas being rewritable independently on each track; second selecting means for selecting the digital signals without the header when the digital signals are recorded in accordance with the second format, whereas selecting the digital signals with the header or the auxiliary data with the header when the digital signals are recorded in accordance with the first format; and recording means, in the case where the digital signals are recorded in accordance with the second format, for recording at least the first digital signals selected by the second selecting means in a single area of the second format on each track, in the case where the digital signals are recorded in accordance with the first format, for recording at least the first digital signals selected by the second selecting means in a specific area among the divided areas of the first format, and for recording the second digital signals selected by the second selecting means in the previously determined areas.
The apparatus may further include detecting means for detecting the data rate of the first digital signals and applying a control signal to the first selecting means when the data rate becomes higher than a predetermined data rate, the first selecting means selecting the first digital signals in response to the control signal.
Further, the present invention provides a method for reproducing digital signals recorded in sequential tracks on a tape-form recording medium, comprising the steps of: reading the digital signals recorded in the sequential tracks on the recording medium; detecting address information included in the read digital signals; reproducing first digital signals for normal reproduction and second digital signals for special reproduction, and auxiliary digital signals on the basis of the detecting address information, each second digital signal having a first, a second, and a third data block aligned in this order, the first and third data blocks storing the same data; selectively outputting the first digital signals or either the first or the second data block of the second digital signals in response to a control signal; and outputting the auxiliary digit
Harumatsu Mitsuo
Higurashi Seiji
Ohishi Takeo
Belk Michael E.
Nguyen Huy
U.S. Philips Corp.
LandOfFree
Digital signal recording method and apparatus and recording... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Digital signal recording method and apparatus and recording..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Digital signal recording method and apparatus and recording... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2575104