JP3141393B2 - Optical disc and information signal recording / reproducing device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disc and an information signal recording / reproducing apparatus for recording a desired image information signal and a reduced image information signal obtained by reducing the desired image information signal on one disc. Things.

2. Description of the Related Art In recent years, as means for selecting which of desired image information signals recorded on a disk to reproduce, an image information signal obtained by reducing the desired image information signal is reproduced on one screen ( Hereinafter, such a reproduction method is often referred to as multi-screen reproduction, and the reproduced screen is referred to as a multi-screen). The method of performing the multi-screen reproduction can be realized by sequentially taking in a part of a desired image information signal recorded on a disk using a memory at the time of reproduction.

As another method, when recording a desired image information signal, a reduced image information signal obtained by reducing the desired image information signal is recorded in another area of a disk, and the desired reduced image information signal is stored in a memory during reproduction. , A multi-screen reproduction can be performed.

Hereinafter, a method of reproducing the above-described multi-screen will be described with reference to the screen.

FIG. 3 shows a recording area of an image information signal on one optical disk in the former method of reproducing a multi-screen, wherein the image information signal is recorded between an inner peripheral portion and an outer peripheral portion of the disk. Are recorded in order. When performing multi-screen reproduction, a part of the first image information signal, a part of the second image information signal, and a part of the desired image information signal are sequentially loaded into the memory. And outputs a desired part of the image information signal on the screen.

FIG. 4 shows a recording area of an image information signal on one optical disk in the latter method of reproducing a multi-screen, and a reduced desired image information is provided on an inner peripheral portion of the disk. Signals, and thereafter, desired image information signals are sequentially recorded. When performing multi-screen reproduction, a desired reduced image information signal is sequentially fetched into a memory, and a desired reduced image information signal is output on one screen when the fetching is completed.

The number of used tracks of the disk required to record one image information signal is n _Pt , the number of image information signals recorded per disk is n _P , and the disk required to record one multi-screen _Assuming that the number of used tracks is n _mt , the number of multi-screens per disk is n _m , and the number of tracks per disk is N, n _Pt n _P + n _{mt nm} = N (1) . When the image information signal is reproduced after performing the multi-screen reproduction, the maximum access time ＴT ^′ _max ▼ of the pickup for reading the image information signal is represented by ア_クセ ス T ^' _Max ▼ = ｛(N-n _Pt ) -n _mt ｝ t (2) In addition, since N≫n _Pt , n _mt (3), the expression (2) is as follows: ＴT ^′ _max ▼ ≒ Nt (4)

However, in the former multi-screen reproduction in the conventional information signal recording / reproducing apparatus, since a part of the image information signal is sequentially loaded into the memory, the number of image information signals increases. And the playback time of the multi-screen becomes slow. In the latter multi-screen reproduction described above, the reproduction time of the multi-screen is fast because the reduced image information signal is recorded separately from the image information signal. However, as is apparent from the above equation, the time required for reproducing the image information signal after performing the multi-screen reproduction depends on the access time.
There is a problem that as the number of image information signals increases, the speed becomes slow.

In view of the above problems, the present invention provides an optical disc and an information signal recording method that can shorten the reproduction time of a multi-screen and the reproduction time of an image information signal after performing multi-screen reproduction even when the number of image information signals increases. It is an object to provide a playback device.

Means for Solving the Problems In order to achieve the above object, an optical disc and an information signal recording / reproducing apparatus according to the present invention include a multi-screen information signal for displaying a plurality of image information signals by reducing them to one frame; An image information signal group consisting of a plurality of image information signals of a plurality of frames constituting an information signal is alternately recorded between an inner peripheral portion and an outer peripheral portion of the disk. Further, using the optical disc recorded in this manner, the multi-screen information signal is captured and reproduced in a memory, and an image information signal of one frame is obtained from a group of image information signals constituting the multi-screen information signal captured in the memory. Select and play.

According to the present invention, since the recording area for one multi-screen has a recording area for the image information signal corresponding to the recording area for one multi-screen according to the above-described configuration, the present invention can be applied to the reproduction of the image information signal after performing the multi-screen reproduction. The time required can be shortened.

Hereinafter, an optical disc and an information signal recording / reproducing apparatus according to an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a diagram showing a recording area of an image information signal on an optical disk, wherein 1 is an optical disk, 2 is a recording area of a reduced image information signal for a first multi-screen, and 3 is a first image. The recording area of the image information signal corresponding to the multi-screen of the second image, and the recording area of the reduced image information signal for the second and subsequent multi-screens, and the recording area of the image information signal corresponding to the same are similarly arranged in this order. And recorded from the inner circumference to the outer circumference of the optical disk.

FIG. 2 is a configuration diagram of an information signal recording / reproducing apparatus for recording an image information signal on the optical disk 1 or reproducing the image information signal therefrom. 1 is an optical disk, 4
Is a motor for rotating the optical disk 1, 5 is an optical pickup, 6 is a drive unit for driving the optical pickup 5 in the radial direction of the optical disk 1, 7 is a recording and reproducing unit, 8 is a memory provided in the recording and reproducing unit, 9 Is a control unit for controlling the motor 4, the drive unit 6 and the recording / reproducing unit 7, and 10 is an operation unit.

Next, the operation of the above embodiment will be described. When an image information signal is recorded on the optical disk 1, the control unit 9 operates the recording / reproducing unit 7 according to an operation input from the operation unit 10, and records the image information signal on the area 3 of the optical disk 1 and then reduces the image information signal. The obtained image information signal is recorded in the area 2. The image information signal is sequentially recorded, and when the image information signal corresponding to one multi-screen is recorded, the image information signal corresponding to the second multi-screen and the reduced image information signal are in the 3 ', 2' area. Will be recorded. The third and subsequent sheets are similarly recorded. When reproducing a multi-screen, the control unit 9 sends a control signal to the drive unit 6 according to an operation input from the operation unit 10,
The optical pickup 5 accesses the recording area 2 of the reduced image information signal of the first multi-screen, for example, and the recording / reproducing unit 7 takes in the reduced image information signal into the memory 8 and reproduces the multi-screen. When reproducing the image information signal, the optical pickup 5 accesses the image information signal recording area 3 corresponding to, for example, the first multi-screen and reproduces the image information signal.

When reproducing an image information signal after performing multi-screen reproduction using the optical disc 1, the maximum access time T _max of the pickup for reading the image information signal is as follows: Becomes From equation (3), equation (4) is Becomes Therefore, the maximum access time is
It is 1 / _nm, and the reproduction time of the image information signal can be shortened accordingly.

As described above, according to the present embodiment, the reduced image information signal recording area and the reduced image information signal recording area corresponding to one multi-screen are continuously arranged from the inner peripheral portion to the outer peripheral portion of the disc. By recording in units, the maximum access time between the reduced image information signal recording area and the image information signal recording area can be shortened.

In the above embodiment, the area 2 for recording the reduced image information signal and the area 3 for recording the image information signal
Can be reversed, and the same effect as in the above embodiment can be obtained.

The information signal is an image information signal, but is not limited thereto.
The present invention can be applied to an information signal recording / reproducing device using such an optical disk, and can be sufficiently used for an optical card or the like.

As described above, according to the present invention, the image information signal corresponding to one multi-screen and the reduced image information signal are continuously transmitted from the inner peripheral portion to the outer peripheral portion of the disc, and the multi-screen unit is provided for each multi-screen unit. By recording, the reproduction speed of the multi-screen and the reproduction speed of the image information signal after performing the multi-screen reproduction can be increased.

[Brief description of the drawings]

FIG. 1 is a schematic plan view showing an information signal recording area on an optical disc in one embodiment of the present invention, FIG. 2 is a schematic block diagram of an information signal recording / reproducing apparatus in one embodiment of the present invention,
3 and 4 are schematic plan views showing information signal recording areas on a conventional optical disk. 1 ... optical disk, 2,2 '... reduced image information signal recording area, 3,3' ... image information signal recording area, 4 ... motor,
5 optical pickup, 6 driving unit, 7 recording / reproducing unit, 8 memory, 9 control unit, 10 operating unit.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H04N 5/76-5/937

Claims (3)

(57) [Claims] 1. A multi-screen display having a disc-shaped substrate and a plurality of tracks formed on the substrate, wherein the tracks include a plurality of image information signals and a reduced size of the plurality of image information signals. For recording a reduced image information signal corresponding to the image information signal, and using one of the tracks adjacent to each other in the plurality of tracks as a recording area for the image information signal. Optical disk to be an area. 2. A multi-screen information signal for displaying a plurality of image information signals reduced to one frame, and an image information signal group comprising a plurality of frames of image information signals constituting the multi-screen information signal. An information signal recording / reproducing apparatus, wherein the multi-screen information signal and the image information signal are alternately recorded between an inner peripheral portion and an outer peripheral portion of the disk adjacent to each other. apparatus. 3. A multi-screen information signal for displaying a plurality of image information signals reduced to one frame and displaying and reproducing an image information signal group including a plurality of frames of image information signals constituting the multi-screen information signal. An apparatus for capturing and playing back the multi-screen information signal in a memory using the optical disc according to claim 1, and an image of one frame from a group of image information signals constituting the multi-screen information signal captured in the memory. An information signal recording and reproducing apparatus for selecting and reproducing an information signal.