Dynamic magnetic information storage or retrieval – General recording or reproducing – Signal switching
Reexamination Certificate
1999-08-02
2003-10-28
Sniezek, Andrew L. (Department: 2651)
Dynamic magnetic information storage or retrieval
General recording or reproducing
Signal switching
C360S064000, C360S018000, C360S060000, C386S349000, C386S349000
Reexamination Certificate
active
06639747
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates generally to a signal recording and reproducing method and a signal recording and reproducing unit. More particularly, the present invention relates to a signal recording and reproducing method and a signal recording and reproducing unit wherein a member such as a rotating drum is provided with reproducing means, erasing means and recording means; an erasing position precedes a recording position and a reproducing position precedes the erasing position; and recording means records a signal on one track of a tape-like storage medium or erasing means erases a signal recorded on one track of the tape-like storage medium, in doing a recording and a reproduction in multiple mode, when the reproducing means does not reproduce a signal recorded on the one track.
2. Description of the Related Art
In a conventional video tape recorder, a rotating drum is provided with a recording head and a reproducing head, whereby the recording head can record a signal on a tape and the reproducing head can reproduce a signal recorded on the tape. Also, the conventional video tape recorder can reproduce a signal recorded on a tape by the reproducing head, and process the reproduced signal to record the processed signal on the tape again by the recording head. Further, the conventional video tape recorder can record a signal, for example, the one supplied from an external device, while reproducing a signal recorded on the tape.
A rotating drum
100
of the above conventional video tape recorder is provided with two reproducing heads
101
re
,
101
ro
and two recording heads
102
we
and
102
wo
as illustratively shown in FIG.
1
. The two reproducing heads
101
re
,
101
ro
are 180 degrees apart from each other and the two recording heads
102
we
,
102
wo
are also 180 degrees apart from each other. These respective recording heads
102
we
,
102
wo
are 90 degrees apart from the reproducing heads
101
re
,
101
ro
. Each head records or reproduces a signal during a period in which the rotating drum
100
is rotated approximately by 180° with heads running on a tape.
When reproducing operation in which a signal recorded on a tape is reproduced using a rotating drum
100
shown in FIG.
1
and recording operation in which a signal is recorded on the tape using the rotating drum
100
are executed simultaneously in multiple mode, the reproducing head
101
re
reproduces a data signal such as an audio signal and a video signal recorded on a track “K” of a tape for a period from time t
41
to time t
43
as shown in FIG.
2
.
Each word in parentheses shown in
FIG. 2
indicates a head located on a track and each word in parentheses in
FIG. 4
described later also similarly indicates a head located on a track.
At time t
42
when the rotating drum
100
is rotated by 90° from its position that the reproducing head
101
re
starts reproducing a data signal at the time t
41
, the recording head
102
we
starts recording a new data signal on a track, for example, “K−1”.
Next, at time t
44
when the rotating drum
100
is rotated by 180° from its position that the reproducing head
101
re
starts reproducing a signal at the time t
41
, the reproducing head
101
ro
starts reproducing a data signal on a track “K+1”. Further, at time t
45
when the rotating drum
100
is rotated by 270° from its position that the reproducing head
101
re
starts reproducing a data signal at the time t
41
, the recording head
102
wo
starts recording a new data signal on the track K. At time t
46
, the rotating drum
100
is rotated once.
The level of a reproduced signal acquired when the tape is reproduced by the reproducing heads
101
re
,
101
ro
is lower than that of a recording signal supplied to the recording heads
102
we,
102
wo
. Therefore, when reproducing operation mode and recording operation mode are simultaneously executed for a period, for example, from the time t
42
to the time t
43
, the reproduced signal is influenced by the recording signal.
Alternatively, in a video tape recorder for which high reliability is required, an erasure is executed using an erasing head before a signal is recorded so that said video tape recorder can guard against an effect of a signal which is not correctly recorded and is left on a tape.
In such a video tape recorder, as shown in
FIG. 3
, a rotating drum
200
is provided with two reproducing heads
201
re
and
201
ro,
which are close to each other, and two recording heads
202
we
,
202
wo
. The recording heads
202
we
,
202
wo
are 180 degrees apart from the respective reproducing heads
201
re
and
201
ro.
As an erasing head
203
cannot be positioned on any positions of the reproducing heads
201
re
,
201
ro
and the recording heads
202
we
,
202
wo
in the current technology, the erasing head
203
is positioned between the reproducing head
201
ro
and the recording head
202
we.
FIG. 4
shows operations of heads in the video tape recorder wherein the rotating drum
200
provided with the reproducing heads
201
re
,
201
ro
, the recording heads
202
we
,
202
wo
and the erasing head
203
as shown in
FIG. 3
is used. For a period from time t
51
to time t
55
, the reproducing head
201
re
reproduces a data signal recorded on a track “K”. Further, for a period from time t
52
to time t
57
, the reproducing head
201
ro
reproduces a data signal recorded on a track “K+1”.
At time t
53
when the rotating drum
200
is rotated by a predetermined angle &thgr; from its position that the reproducing head
201
re
starts reproducing a data signal at the time t
51
, the erasing head
203
is located on track(s), for example, “K−1” and “K−2”. In a household digital VTR format for example, the erasing head
203
erases an audio signal and a video signal respectively recorded after an insert and track information (ITI) sector (an area in which information related to its track and others are recorded) for a period from time t
54
to time t
59
.
At time t
56
when the rotating drum
200
is rotated by 180° from its position that the reproducing head
201
re
starts reproducing a data signal at the time t
51
, recording head
202
we
records a new data signal on a track, for example, “K−4”. At time t
58
, the recording head
202
wo
records a new data signal on a track “K−3” and at time t
60
, the rotating drum
200
is rotated once.
The level of a reproduced signal acquired when a tape is reproduced by the reproducing head
201
r
is lower than that of an erasing signal supplied to the erasing head
203
. Therefore, as described above, when erasing operation is executed during reproducing operation, that is, when reproducing operation and erasing operation are simultaneously executed for a period from the time t
54
to the time t
57
, even if reproducing operation and recording operation are executed in different periods, the reproduced signal is influenced by the erasing signal.
SUMMARY OF THE INVENTION
The object of the present invention is to provide a signal recording and reproducing method and a signal recording and reproducing unit wherein a recorded signal can be satisfactorily reproduced even if signal reproducing operation, signal recording operation and signal erasing operation are executed simultaneously in multiple mode.
In carrying out the invention in one preferred embodiment, we provide a signal recording and reproducing unit for recording a series of signals on a tape-like storage medium running on, for reproducing the series of signals recorded on the tape-like storage medium and for erasing the series of signals recorded on the tape-like storage medium. Said signal recording and reproducing unit comprises a rotating drum, recording means for forming a recording track on the tape like storage medium running on and for recording the series of signals on the track, erasing means for erasing a series of signals recorded on a recording track preceding the recording track formed by the recording means, reproducing means for reproducing
Asakura Hiroyuki
Kondo Hideaki
Frommer William S.
Frommer & Lawrence & Haug LLP
Polito Bruno
Sniezek Andrew L.
LandOfFree
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