Motion video signal processing for recording or reproducing – Local trick play processing – With randomly accessible medium
Reexamination Certificate
1996-01-17
2001-06-05
Nguyen, Huy (Department: 2615)
Motion video signal processing for recording or reproducing
Local trick play processing
With randomly accessible medium
C386S349000
Reexamination Certificate
active
06243529
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a recording and/or reproducing apparatus for recording and/or reproducing signals on and/or from a recording medium and, more particularly, to a recording and/or reproducing apparatus in which reproducing characteristics are improved particularly in a slow-speed reproducing mode in which the recorded signals are reproduced from the recording medium running at an average speed lower than in the recording mode.
2. Description of the Related Art
Rotary head type magnetic recording/reproducing apparatuses of the type mentioned above have a slow-speed reproducing mode in which signals are reproduced from a recording medium, e.g., a magnetic tape, running at an average speed lower than the running speed of the medium in the recording mode. In general, there are two types of methods which realize such a slow-speed reproducing mode. In one of these methods, the desired low tape running speed is attained by intermittently feeding the tape, i.e., by alternately employing a period in which the tape is fed at the same speed as that in the recording mode and a period in which the tape is held still. The other method, generally referred to as the “dynamic tracking mode”, employs an actuator to a free end of which is fixed a head carried by a rotary drum. The actuator displaces the head in a direction which intersects the direction of rotation of the rotary drum, so that reproduction is conducted with high degree of tacking precision from the tape which runs at a constant speed lower than the speed in the recording mode.
With the first-mentioned slow-speed reproducing mode, however, it is difficult to pick-up signals from the whole track width throughout the period of the slow-speed reproduction, because of a lack of precision in the tape feed control. Consequently, noise is produced during slow-speed reproduction or, alternatively, an additional head for exclusive use in slow-speed reproduction has to be employed.
Furthermore, in a reverse slow-speed reproduction mode in which the tape is fed in a direction reverse to that for recording, reproduction cannot be conducted satisfactorily even when an exclusive slow-speed reproducing head is used, because the head trace angle largely differs from the track angle.
The second-mentioned slow-speed reproducing method, i.e., the “dynamic tracking”, requires complicated mechanisms and control in order to achieve the dynamic tracking function, resulting in increased costs of production. In addition, it is not easy to precisely control the feeding of the tape at the reduced speed.
The current trend towards the use of digital signals applies also to the field of VTRS, and digital VTRs have been proposed in line with this trend. In such a digital VTR, as shown in FIGS.
1
(
a
) and
1
(
b
), image signals for one frame are divided into plural blocks. Each block, generally referred to as sync block, is composed of image data, a sync signal for enabling digital demodulation, and an ID signal which comprises position information indicative of the position of the block in the frame. The sync blocks are then recorded in a tape in a manner shown in FIG.
1
(
c
). Although not illustrated in detail in FIGS.
1
(
a
) and
1
(
b
), the audio signal has a construction similar to that of the video signal.
In most cases, reproduction is conducted by reproducing the data of the blocks through digital demodulation, recombining the reproduced data in a frame memory based on the ID signals to form the image information on a frame basis, and then outputting the information of the successive frames.
In the digital VTR, the image is output through a memory, rather than by directly forming output signals in real time from the RF signals reproduced through the head tracking operation.
The present inventors have found that this feature of the digital VTR allows the operation of a superior and novel slow-speed reproducing function different from those of the known arts.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a recording/reproducing apparatus which realizes the above-mentioned novel slow-speed reproducing function.
According to one aspect of the present invention, there is provided an information recording/reproducing apparatus which includes structure for effecting a desired special reproduction mode by feeding a recording medium such as a tape at a speed lower than that in a recording mode so as to obtain a plurality of blocks of reproduced image data from a preselected region, e.g., a track, of the recording medium. There is also provided structure for synthesizing the image by reassembling the reproduced image data on block basis in accordance with address information contained in the blocks of the reproduced data, whereby a specific reproduction (such as slow-speed reproduction) can be conducted with improved quality of the reproduced image.
According to another aspect of the present invention, a recording/reproducing apparatus for (i) recording in a recording mode and/or (ii) reproducing mode information to and/or from a recording medium which stores information and address data comprises a recording medium moving means for moving, in the reproducing mode, the recording medium at a speed which is slower than a speed at which the recording medium is moved in the recording mode. Synthesizing means are provide for reproducing, a plurality of times, information recorded in a predetermined region of the recording medium to obtain a plurality of portions of reproduced data. The synthesizing means synthesizes the portions of reproduced data by using the address data contained in the information recorded in the recording medium in order to provide synthesized reproduced information.
According to a further aspect of the present invention, a reproducing apparatus for reproducing information recorded in a recording medium which stores information and address data includes recording medium moving means for moving the recording medium selectively at one of (i) a first speed and a (ii) second speed which is slower than the first speed. Synthesizing means are provided for reproducing, a plurality of times, information recorded in a predetermined region of the recording medium to obtain a plurality of portions of reproduced data. The synthesizing means synthesizes the portions of reproduced data by using the address data contained in the information recorded in the recording medium to provide synthesized reproduced information.
According to yet another aspect of the present invention, a reproducing apparatus for reproducing information recorded in a recording medium comprises reproducing means for reproducing information recorded in a predetermined region of the recording medium, and storage means for storing the reproduced information produced by the reproducing means. Signal generating mans are provided which, in a mode in which reproduction from the predetermined region is conducted a plurality of times, generates a plurality of signals indicative of predetermined states of the reproduced information produced by the reproducing means over the plurality of times of reproduction. Comparator means are provided for comparing the plurality of signals generated by the signal generating means with one another. Finally, control means are provided for controlling the storage of the reproduced information in the storage means in accordance with the result of the comparison performed by said comparator means.
The above and other objects, features and advantages of the present invention will become clear from the following description of the preferred embodiments when the same is read in conjunction with the accompanying drawings.
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Kikuchi Takayuki
Takayama Nobutoshi
Canon Kabushiki Kaisha
Fitzpatrick ,Cella, Harper & Scinto
Nguyen Huy
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