Method, device, and medium for recording digital signal

Details Method, device, and medium for recording digital signal Method, device, and medium for recording digital signal

1997-09-29

2000-08-22

Sniezek, Andrew L.

Dynamic magnetic information storage or retrieval

Recording or reproducing plural information signals on the...

360 22, 360 7308, 386 80, 386 81, G11B 502

Patent

active

061081485

DESCRIPTION:

BRIEF SUMMARY
TECHNICAL FIELD

The invention relates to a digital signal recording method, and recording apparatus and recording medium thereof, and more particularly, to a method for recording a digital signal on a tape-like recording medium by a rotating head, and its recording apparatus and recording medium.


BACKGROUND ART

In general, when a digital signal is recorded on and reproduced from a tape-like recording medium such as a magnetic tape by a rotating head, the digital signal is recorded and reproduced in data blocks. On the other hand, at trick play reproduction (special reproduction) that reproduces a digital signal at a speed different from that of recording, a rotating head scanning track on a tape-like recording medium unlike at normal reproduction, traverses diagonally a recording track, reproduces in data blocks only a track existing recording signal recorded by a rotating head with the same azimuth angle as a reproducing rotating head; therefore, head output viewed with a time axis is reproduced in burst form at regular intervals, making it difficult to obtain a trick play reproducing signal.
For this reason, a digital signal recording method that permits trick play reproduction is known, by converting a trick play reproducing digital signal into a normal reproducing digital signal to locate and record on a rotating head scanning track at trick play reproduction, on a track on which a normal reproducing digital signal is conventionally recorded (e.g. Japanese Patent Laid-Open No. 261278/1994: Title of the Invention "A Signal Recording and Reproducing Apparatus").
However, cumulation of the amount of data recorded on the tape-like recording medium is fixed in the above conventional digital signal recording method; therefore, to record a trick play reproducing digital signal (also hereinafter called special reproducing data), reserving a constant amount of area forces the rest to be a data area for recording and reproducing a normal reproducing digital signal (also hereinafter called normal reproducing data).
The recorded amount of special reproducing data is fixed in the above conventional digital signal recording method; therefore, when a normal reproducing data transmission rate which is different depending on the contents of information, broadcasting system and so on, is high, the fixed recorded amount of special reproducing data restricts recording of the essentially necessary amount of normal reproducing data.
Further, FIG. 1 shows an example of a track pattern for fast reproduction as trick play. In the same diagram, the diagonally shaded portions on main data areas are fast-reproducing digital signal (fast-reproducing data) recording portions; and the other blank portions are normal reproducing digital signal (normal reproducing data) recording portions. As shown in the same diagram, this track pattern shows a pattern where 6-fold speed fast-reproducing data is located in two areas within each track recorded by a rotating head with the same azimuth angle; and the same data is multiplexed and recorded six times in tracks recorded horizontally by a rotating head with the same azimuth angle.
Use of phase control in two tracks at reproduction for a magnetic tape with this track pattern, to start a head trace in relation to a constant phase for a given track on which fast-reproducing data is recorded, can reproduce all necessary data, even if head scanning is started with any track (this recording and reproducing method is called "phase lock").
Also this track pattern can reproduce these fast-reproducing data at an approximately 1- to 2-fold speed, and 3- to 4-fold speed. In this case, the reproducing rate in n-fold speed (n<6) is n/6 for a 6-fold speed reproducing rate. FIG. 1 represents a 3-fold speed head scanning track as 3x; and a 6-fold speed head scanning track as 6x.
The above conventional digital signal recording and reproducing method, locating the same special reproducing data repeatedly, has no good recording efficiency. In addition, because a relatively many fast-reproducing data reco

REFERENCES:
patent: 5583650 (1996-12-01), Lane et al.
patent: 5734783 (1998-03-01), Shimoda et al.
patent: 5751890 (1998-05-01), Yamasaki et al.
patent: 5953486 (1999-09-01), Hamamoto et al.
IEEE Transactions On Consumer Electronics, vol. 40, No. 3, Azadegan et al, "Data -Placement...", pp. 94-95, Aug. 1994.

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