Motion video signal processing for recording or reproducing – Local trick play processing – With randomly accessible medium
Reexamination Certificate
1999-09-20
2001-02-27
Tran, Thai (Department: 2715)
Motion video signal processing for recording or reproducing
Local trick play processing
With randomly accessible medium
C386S349000
Reexamination Certificate
active
06195499
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to an apparatus for recording and reproducing digital signals on and from a magnetic tape by using a rotary head; and, MORE particularly, the invention relates to a magnetic recording and/or reproducing apparatus having a plurality of modes matched to transmission rates of digital signals.
The present applicant has proposed, in Japanese Patent Laid-open No. Hei 8-180580, a magnetic recording/reproducing apparatus which is compatable with a conventional analog recording VTR and which also provides a plurality of recording/reproducing modes matched to the transmission rates of digital signals.
This magnetic recording/reproducing apparatus is characterized by recording/reproducing digital signals by using first and second magnetic heads opposed to each other by 180° in a standard recording/reproducing mode; by using the first magnetic head and a third magnetic head disposed in proximity thereto in a long-time recording/reproducing mode which is twice as long as the standard recording/reproducing mode; and by using fourth and fifth magnetic heads opposed to each other by 180° in addition to the second and third magnetic heads in a high rate recording/reproducing mode adapted to high-definition television (HDTV) signals and the like.
SUMMARY OF THE INVENTION
The above-described apparatus proposed by the present applicant, however, has a problem. If the first and second magnetic heads used for the standard recording/reproducing mode are opposed to each other by 180°, the second and third magnetic heads used for the high rate recording/reproducing mode are not accurately opposed to each other by 180°. On the contrary, if the second and third magnetic heads used for the high rate recording/reproducing mode are opposed to each other by 180°, the first and second magnetic heads used for the standard recording/reproducing mode are not accurately opposed to each other by 180°. As a result, there occurs a deviation in the recording pattern in either the standard recording/reproducing mode or the high rate recording/reproducing mode. Such a deviation in recording pattern possibly causes a hindrance to attainment of compatibility with an apparatus having another head configuration.
Further, the above-described apparatus is configured such that the first and third magnetic heads used for the long-time recording/reproducing mode, which is twice as long as the standard recording/reproducing mode, are disposed in proximity to each other, and it fails to consider the case in which the first and third magnetic heads are disposed separately from each other.
An object of the present invention is to solve the above-described problems of the prior apparatus and to provide a magnetic recording and/or reproducing apparatus capable of forming an ideal recording pattern even in the case of adopting any head configuration, thereby attaining compatibility between apparatuses having different head configurations.
To achieve the above object, according to the present invention, there is provided a magnetic recording and/or reproducing apparatus including:
first and second magnetic heads having positive and negative azimuth angles and being opposed to each other by 180°;
third and fourth magnetic heads having positive azimuth angles and being opposed to each other by 180°; and
fifth and sixth magnetic heads having negative azimuth angles and being opposed to each other by 180°;
wherein each of three pairs of the first and second magnetic heads, the third and fourth magnetic heads, and the fifth and sixth magnetic heads are mounted substantially at an equal height;
the second and fourth magnetic heads are mounted substantially at a height difference Hb=(Tp/2)×(ø b/180°) where ø b is a difference in mounting angle between the second and fourth magnetic heads and Tp is a track pitch, and the third and fourth magnetic heads are mounted substantially at a height difference Hc=Tp−(2×Tp)×(ø c/180°) where ø c is a difference in mounting angle between the third and fourth magnetic heads;
whereby recording/reproducing is performed by using the first and second magnetic heads in a standard recording/reproducing mode; by using the third, fourth, fifth and sixth magnetic heads in a high rate recording/reproducing mode; and by using the second and fourth magnetic heads in a long-time recording/reproducing mode which is twice as long as the standard recording/reproducing mode.
REFERENCES:
patent: 4954902 (1990-09-01), Furuhata et al.
patent: 5825971 (1998-10-01), Inoue et al.
patent: 6055358 (2000-04-01), Traxlmayr
Amada Nobutaka
Hirayama Kuniaki
Nishijima Hideo
Okamoto Hiroo
Zama Hideo
Antonelli Terry Stout & Kraus LLP
Hitachi , Ltd.
Onuaku Christopher
Tran Thai
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