Motion video signal processing for recording or reproducing – Local trick play processing – With randomly accessible medium
Reexamination Certificate
1997-05-09
2001-05-22
Sniezek, Andrew L. (Department: 2651)
Motion video signal processing for recording or reproducing
Local trick play processing
With randomly accessible medium
C386S349000, C386S349000, C360S072200, C360S073040, C711S217000
Reexamination Certificate
active
06236803
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a reproducing apparatus that reproduces signals recorded on a recording medium.
2. Description of the Related Art
It is a general practice to use a video tape recorder (VTR) using a ½-inch or 8-mm width magnetic tape in recording video signals and audio signals in the form of analog signals.
FIG. 5
is a block diagram showing the configuration of a conventional VTR. Referring to
FIG. 5
, a recording-review function of checking what is being video-taped will be explained. A video image picked up by a camera
51
and a sound picked up by a microphone
52
are processed for recording by a video signal processing circuit
53
and an audio signal processing circuit
54
and combined by an adder
55
into one signal which is then sent to a recording head
56
. When a shooting start command is issued through an input key
57
, a system control circuit
58
sends a record command to a servo circuit
59
, which controls a capstan motor
60
and a drum motor
61
so as to rotate them at rotational frequencies for recording. The recording head
56
attached to a drum
62
records received signals representing a video image and sound onto a magnetic tape
63
.
When a user stops shooting by pressing the input key
57
, the system control circuit
58
, in response to the command from the input key
57
, sends a recording review command to the servo circuit
59
. The servo circuit
59
stops the two motors
60
,
61
to stop the recording operation and then reverses the capstan motor
60
. At this time, the drum motor
61
is controlled to match the relative speed of a reproducing head
64
on the drum
62
so that signals recorded on the magnetic tape
63
can be reproduced. The signals reproduced by the reproducing head
64
are converted by a video signal processing circuit
65
into video signals and by an audio signal processing circuit
66
into audio signals. The video signals are displayed on a viewfinder
67
and the audio signal is sent to a headphone terminal
68
.
The servo circuit
59
counts the pulses (CFG) that are output each time the capstan motor
60
rotates and rewinds the magnetic tape
63
to a position where video-taping is started. Then, the servo circuit
59
controls the capstan motor
60
and the drum motor
61
so as to rotate in the same direction and at the same speed as those during the recording, and performs reproduction to a position of the magnetic tape
63
where the video-taping is stopped. The user monitors the video image being reproduced on the viewfinder
67
.
The above-mentioned VTR, however, has a drawback that it takes a rather long time to rewind the recorded magnetic tape in order to perform the recording-review and it takes a very long time to reproduce the tape in a normal reproducing mode.
SUMMARY OF THE INVENTION
An object of this invention is to provide a reproducing apparatus capable of reproducing recorded signals efficiently and reliably.
Another object of this invention is to provide a reproducing apparatus capable of reproducing recorded signals in a short time.
Still another object of this invention is to provide a reproducing apparatus capable of reproducing recorded signals in a fixed time.
To achieve the above object, a reproducing apparatus of one embodiment of this invention comprises reproducing means having a first reproducing mode and a second reproducing mode different from the first reproducing mode and for reproducing a signal recorded on a recording medium, detection means for detecting a recording time of the signal recorded on the recording medium, and control means for switching the reproducing means between the first reproducing mode and the second reproducing mode according to the recording time detected by the detect ion means. Because of this configuration, it is possible to perform tape reproduction in an appropriate reproducing mode according to the recording time of the signal recorded on a recording medium.
According to another embodiment of this invention, a reproducing apparatus comprises reproducing means having a first reproducing mode and a second reproducing mode different from the first reproducing mode and for reproducing a signal recorded on a recording medium, detection means for detecting an amount of information of the signal recorded on the recording medium, and control means for switching the reproducing means between the first reproducing mode and the second reproducing mode according to the amount of information detected by the detection means. Because of this configuration, it is possible to perform tape reproduction in an appropriate reproducing mode according to the amount of information of the signal recorded on a recording medium.
According to still another embodiment of this invention, a reproducing apparatus comprises reproducing means for reproducing a signal recorded on a recording medium, and control means for performing control in such a way as to make a reproducing time taken by the reproducing means constant irrespective of a recording time of the signal recorded on the recording medium. Because of this configuration, it is possible to always reproduce a signal recorded on a recording medium in a fixed time irrespective of the recording time of the signal.
According to a further embodiment of this invention, a reproducing apparatus comprises reproducing means for reproducing a signal recorded on a recording medium, and control means for performing control in such a way as to make a reproducing time taken by the reproducing means constant irrespective of an amount of information of the signal recorded on the recording medium. Because of this configuration, it is possible to always reproduce a signal recorded on a recording medium in a fixed time irrespective of the amount of information of the signal.
Other objectives and features of the present invention will become apparent from the following description-in this specification and the attached drawings.
REFERENCES:
patent: 4267564 (1981-05-01), Flores
patent: 4478376 (1984-10-01), Sakaguchi et al.
patent: 4539603 (1985-09-01), Takeuchi et al.
patent: 4774699 (1988-09-01), Giddings
patent: 4800450 (1989-01-01), Rodal et al.
patent: 5079651 (1992-01-01), Tsuchida et al.
patent: 5179479 (1993-01-01), Ahn
patent: 5349479 (1994-09-01), Arimura et al.
patent: 5361177 (1994-11-01), Kozuki et al.
patent: 5566032 (1996-10-01), Cleveland et al.
Koyama Shinichi
Takahashi Koji
Canon Kabushiki Kaisha
Robin Blecker & Daley
Sniezek Andrew L.
LandOfFree
Reproducing apparatus does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Reproducing apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Reproducing apparatus will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2458505