Motion video signal processing for recording or reproducing – Local trick play processing – With randomly accessible medium
Utility Patent
1995-01-13
2001-01-02
Chevalier, Robert (Department: 2715)
Motion video signal processing for recording or reproducing
Local trick play processing
With randomly accessible medium
C358S302000, C358S302000, C358S302000, C358S003050, C360S031000, C360S061000, C360S013000, C360S013000, C360S013000, C360S013000
Utility Patent
active
06169845
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a moving-image recording/reproducing apparatus, and, more particularly, to a moving-image recording/reproducing apparatus capable of simultaneously recording/reproducing data to and from a plurality of video cameras, VTRs, video disks, displays, printers which are I/O means for moving images connected thereto.
2. Description of the Prior Art
A variety of moving-image recording/reproducing apparatuses have been developed. For example, a structure which employs an optical disk has been disclosed in Japanese Patent Laid-Open No. 57-78639. According to that disclosure, video signals, audio signals and data signals are, as shown in
FIG. 1
, recorded on an optical disk, the above-described video, audio and data signals being recorded as optical information (pits) by utilizing the optical permeability, the reflection characteristics, the phase characteristics and the polarization characteristics thereof in spiral or concentric information tracks after the above-described signals have been encoded.
Information recorded on the optical disk is reproduced in such a manner that an optical disk
63
is rotated at, for example, 1800 rpm/minute by a spindle
64
and light emitted from a light source
66
such as a laser is applied to a spiral or concentric information track
65
the optical disk
63
via a lens
67
, a half mirror
68
, a reflection mirror
69
and an objective lens
70
. Then, reflected light from the information track
65
which has been modulated in accordance with optical information is inverted so as to be reflected by the half mirror
68
. This reflected light is detected by a light receiving device
72
via a lens
71
so that information is reproduced. In order to make light such as a laser beam accurately follow the information track
65
, focusing and tracking error signals are detected from a signal detected by the light receiving device
72
. In response to the thus detected focusing and tracking error signals, the objective lens is moved in the focusing or tracking direction by the actuator
62
. According to the disclosure, the structure is arranged in such a manner that the above-described optical devices (
66
to
72
) are supported by an optical head
73
so as to be integrally moved in the radial direction of the optical disk
63
. As a result, the information tracks are successively scanned in the radial direction. In the case where information is recorded on the optical disk
63
, a structure is employed in which the half mirror
68
, the lens
71
and the light receiving device
72
are omitted from the optical system shown in
FIG. 1 and a
modulator is disposed between the light source
66
and the objective lens
70
. Furthermore, light having energy larger than that of the light used at the time of the reproduction operation is emitted from the light source
66
, the light having the larger energy being modulated by the modulator in accordance with information to be recorded. The thus modulated light is applied from the inner portion toward the outer portion or from the outer portion toward the inner portion of the optical disk
63
. During the moving process, a spiral or concentric information track is formed for each rotation.
When an access to information is made at the time of novel recording or novel reproducing, the optical head
73
is moved in the radial direction by a slider or a linear motor (omitted from the illustration) to a position close to a desired track (rough access). Then, the optical beams are converged onto the subject track (precise access) by using an optical polarizing means (the actuator
62
). The time in which the optical head
73
is moved from a certain track to a desired track with performing the rough access and the precise access is called “seeking time”. Furthermore, the time taken to seek one-third of all of the tracks is called “average seeking time”, the average seeking time usually being several tens of milleseconds (ms).
The above-described moving-image recording/reproducing apparatuses are widely used in a variety of fields in which moving images are used, such as explanation, education and instruction. In the above-described fields, a moving-image recording/reproducing means
76
is, as shown in
FIG. 2
, connected to a plurality of terminals
75
for displaying a moving image via a communication cable
74
. However, a problem arises in the above-described structure in that, when one moving-image recording/reproduction is performed from any of the plurality of the terminals, another moving-image recording/reproduction to and from the other terminals cannot be conducted. Since the recording/reproduction of the moving image usually takes several minutes or longer, there arises the necessity of a waiting time from start of the recording/reproducing operation performed by a terminal to its completion.
In order to overcome the above-described problem, another control system as shown in
FIG. 3
has been disclosed. According to this structure, the same continuous moving-images have been recorded on a plurality of moving image recording/reproducing means
76
and a corresponding moving-image recording/reproducing means is selected from the plurality of terminals. As a result, optional moving-image recording/reproducing operations can be simultaneously performed.
However, according to the above-described structure, a copy of each of the moving images must be recorded on the recording medium of each of the moving-image recording/reproducing means. Therefore, the overall capacity of the recording medium is reduced and the quantity of moving images which can be recorded/reproduced is thereby reduced (due to the overlap, i.e. redundant, recording).
SUMMARY OF THE INVENTION
Accordingly, it is and an object of the present invention to provide a moving-image recording/reproducing apparatus capable of simultaneously recording/reproducing a plurality of moving images, the moving-image recording/reproducing apparatus being arranged in such a manner that the recording medium corresponding to a plurality of moving-image recording/reproducing means does not overlap-record the same moving image so as to utilize the maximum recording capacity thereof.
In order to achieve the above-described object, according to the present invention, there is provided a moving-image recording/reproducing apparatus for recording/reproducing a plurality of moving images by using a plurality of moving-image I/O passages, the moving-image recording/reproducing apparatus comprising: a plurality of moving-image recording/reproducing means, switch means for selectively establishing a connection between the plurality of moving-image I/O passages and the plurality of moving-image recording/reproducing means, and control means for controlling the switching operation of the switch means, wherein the control means performs the recording/reproducing of the moving images input/output from each of the moving-image I/O passages by allocating the moving images to each of the moving-image recording/reproducing means in accordance with an instructed sequential order and controls the switching operation in such a manner that a plurality of the moving-image I/O passages are not allocated concurrently to the same moving-image recording/reproducing means.
Other and further objects, features and advantages of the invention will be appear more fully from the following description.
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patent: 4450490 (1984-05-01), Fujii et al.
patent: 4516166 (1985-05-01), Tellone
patent: 4577240 (1986-03-01), Hedberg et al.
patent: 4873583 (1989-10-01), Kobayashi et al.
patent: 5067029 (1991-11-01), Takahashi
patent: 5084789 (1992-01-01), Kamo et al.
patent: 3318279 (1984-11-01), None
patent: 0113993 (1984-07-01), None
patent: 0187073 (1986-07-01), None
patent: 2521757 (1983-08-01), None
patent: 61-187168 (1986-08-01), None
patent: 0114673 (1993-07-01), None
Proceedings SPIE: Optical Data Storage Meeting, vol. 1078, Jan. 17, 1989, pp. 112-120, Knight et al. “Optical Storage System Architectur
Canon Kabushiki Kaisha
Chevalier Robert
Fitzpatrick ,Cella, Harper & Scinto
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