JPH0677392B2 - Disk playback device - Google Patents

Description

The present invention relates to a disc reproducing apparatus.

[Outline of Invention]

The present invention relates to a disc reproducing apparatus for reproducing a disc on which information data and frame data related thereto are recorded and a disc on which information data and time data related thereto are recorded, in which frame data is time data and time data is frame data. Whether the disc to be used is a disc on which the frame data related to the information data is recorded or the disc on which the time data related to the information data is recorded is selected by converting the data into the data. Regardless of this, the information data recorded on the disc can be contributed or displayed in either frame or time.

[Conventional technology]

Discs that can be played back by conventional optical video disc playback devices include CAV (Constant Angular Velcoity) discs,
There are two types, CLV (Constant Linear Velocity) disc.

The CAV disc is a standard disc with a constant rotation speed of 1800 rpm and 30 minutes on one side (60 minutes on the screen). This CAV disc is
One frame of the video signal is recorded on one track, and there are 54000 tracks in total. Frame data having frame numbers 1 to 54000 are added to the frame video signals recorded on these tracks. Since one frame of the video signal is recorded on this one track, the CAV disc is capable of random access (swing search), triple speed reproduction, slow motion reproduction, still image reproduction, frame advance reproduction and the like.

The CLV disk rotates at a constant linear velocity of about 11 m / sec, and its rotation speed changes from 1800 rpm to 600 rpm from the inner circumference to the outer circumference, and is 60 minutes on one side (120 minutes on both sides). In this CLV disc, one frame of video signal is recorded on the innermost track, but three frames of video signal are recorded on the outermost track. In this case, time data is added to the video signal.

In both the CAV disc and the CLV disc, chapter data is added to the video signal.

Next, a search operation used in the remote control device in the conventional optical video disc reproducing apparatus will be described.

a) Frame search This frame search is possible only for CAV discs. When the index button is pressed, the current frame number and chapter number (if any) are displayed on the monitor receiver. When the frame / time button is pressed during reproduction, frame 0 is displayed on the monitor receiver. Enter the desired frame number with the numeric keypad and this will be displayed on the monitor receiver. When you press the search button, the screen of the monitor receiver disappears and the search starts. During that search period, the indicator Play / Standby flashes, and when the video signal of the specified frame is found, it is played back as a still image. To be done. Then, when the play button is pressed, normal reproduction of the video signal is started from that frame.

b) Time search This time search is valid only for CLV discs. When the index button is pressed, the current time and chapter number (if any) is displayed on the monitor receiver. If you press the frame / time button during playback, the time 0:00 will be displayed on the monitor receiver. Enter the desired time using the numeric keypad and this will be displayed on the monitor receiver. When you press the search button, the screen of the monitor receiver disappears, search starts,
During the search period, Play / Standby is displayed blinking on the indicator, and when the video signal of the designated time is found, it is reproduced as a still image. Then, when the play button is pressed, normal reproduction of the video signal is started from that time.

c) Chapter search This chapter search is possible for both CAV discs and CLV discs, but since this chapter data is not always recorded, this search becomes impossible. . When the index button is pressed, the current frame or time and chapter number (if any) is displayed on the monitor receiver. When the chapter button is pressed during reproduction, chapter 0 is displayed on the monitor receiver. Enter the desired chapter with the numeric keypad and it will be displayed on the monitor receiver. When the search button is pressed, the screen of the monitor receiver disappears and the search starts. During the search period, the indicator Play / Standby flashes, and when the video signal of the specified chapter is found, it is played back as a still image. To be done. When the play button is pressed, normal reproduction of the video signal is started from that chapter.

Besides, there are chapter stop, memory play, etc., but the description thereof is omitted.

[Problems to be solved by the invention]

In the above-mentioned conventional disc reproducing apparatus for reproducing a disc on which video data and related frame data are recorded and a disc on which video data and related time data are recorded, the former disc, that is, a CAV disc is reproduced. In this case, the search and the display can be performed only in the frame, and in the latter disc, that is, the CLV disc, the search and the display can be performed only in time.

In view of such a point, the present invention irrespective of whether the disc to be used is a disc on which information data and frame data related thereto are recorded or whether information data and time data related thereto are recorded. ,
An object of the present invention is to propose a disc reproducing apparatus capable of retrieving or displaying information data recorded on a disc by either frame or time.

[Means for solving problems]

The present invention, in a disc reproducing apparatus for reproducing a disc on which information data and frame data related thereto are recorded and a disc on which information data and time data related thereto are recorded, a conversion means for converting frame data into time data. , And conversion means for converting time data into frame data.

[Action]

According to the present invention, since the frame data can be converted into the time data and the time data can be converted into the frame data, the disc to be used can record the information data and the frame data related to the information data. It is possible to retrieve or display the information data recorded on the disc at any of the frame and the time regardless of whether it is a recorded disc or a disc on which information data and time data related to the information data are recorded. it can.

〔Example〕

Hereinafter, an embodiment in which the present invention is applied to an optical video disc reproducing apparatus will be described in detail with reference to the drawings. First, an outline of the video disc reproducing apparatus will be described with reference to FIG. (1) is an optical pickup, which allows the FM-modulated video signal and the FM-modulated video signal recorded on the video disc (16) rotated by the motor (17).
The modulated audio signal is reproduced. The signal reproduced by the pickup (1) is supplied to a bandpass filter (2) for extracting the FM-modulated video signal for extraction, and then supplied to an FM demodulator (3) for demodulation. , The video signal is output. This video signal is supplied to the monitor receiver (6) through the time base collector (TBC) (4) and the mixing circuit (5).

The video signal from the FM demodulator (3) is the code separation circuit (7)
To the Philips code decoder (8), the code data added to the video signal is separated, the separated code data is supplied to the Philips code decoder (8) and is decoded, and the Philips data is supplied to the microcomputer (9). To be done.

A display unit (10) displays a frame or a time and a chapter under the control of the microcomputer (9).
(12) is a non-locking normally open switch for switching between frame and time search and display, one end of which is connected to the microcomputer (9) and the power source + B through the resistor (13), and the other end of which is grounded. .

(11) is a character generator, which is controlled by the microcomputer (9) and generates a character signal corresponding to the display contents of the display (10), and the mixing circuit (5) outputs the video signal from the TBC circuit (4). And the characters, that is, chapters and frames or times, are displayed on the monitor receiver (6).

A system controller (14) controls the motor (17) via the servo circuit (18) under the control of the microcomputer (9) and the optical pickup (1) via the servo circuit (15). Feeding, focusing,
Control tracking etc.

Next, referring to FIG. 3, a video disc (16) mainly performed by the microcomputer (9) and the system controller (14) of the video disc reproducing apparatus of FIG.
The frame and time search for will be described. First, in step ST-1, destination search data of a video disc (regardless of whether the video disc filled in the playback device is a CAV disc or a CLV disc, any desired frame number or time) Is input, for example, by operating a remote controller. Then, in step ST-2, the Philips data is read from the video disc. Then, in step ST-3, it is determined whether the Philips data is a frame (in the case of a CAV disc) or a time (in the case of a CLV disc), and if it is the frame (in the case of a CAV disc). If it is time (in the case of CLV disc), go to step ST-4.

In step ST-4, it is determined whether or not the search data input in step ST-1 is a frame, and if there is no frame, the process proceeds to step ST-5, and if it is a frame, step ST
Go to -13. In step ST-11, step ST-1
It is determined whether or not the search data input in step S6 is time, and if not, the process proceeds to step ST-12, and if it is time, the process proceeds to step ST-6.

At step ST-5, the frame data input at step ST-1 is converted into time data. Details of this will be described later with reference to FIG. Next to step ST-5 or step ST-11 (in the case of YES), the process proceeds to step ST-6, and the video disc is searched by time data. Then, in step ST-7, the Philips data is read from the video disc. Next, in step ST-8, it is judged based on the read Phillips data whether or not the frame data is input. If not, the process proceeds to step ST-10, and if the frame data, step ST-9. Proceed to. At step ST-9, the input frame is converted into time. Step ST-
At 10, it is determined whether or not the destination search value (time) and the data (time) at the current playback position of the video disc are equal.
Go to -7, step S until step ST-10 becomes YES
The operation from T-7 to step ST-10 is repeated.

In step ST-12, the time data input in step ST-1 is converted into frame data for calculation. Details of this will be described later with reference to FIG. After step ST-12 or step ST-4 (in the case of YES), the process proceeds to step ST-13, and the video disc is searched by the frame data. Then, in step ST-14, the Philips data is read from the video disc being reproduced. Then, in step ST-15, based on the read Phillips data, it is determined whether or not time data is input. If not, the process proceeds to step ST-17, and if it is time data, step ST-16. Proceed to. Step ST-
In step 16, the input time is converted into a frame for calculation. In step ST-17, it is determined whether or not the destination search value (frame) and the data (frame) at the current reproduction position of the video disc are equal. If they are equal, the process ends. If not, the process proceeds to step ST-14. Then, the operation of steps ST-14 to ST-17 is repeated until YES at step ST-17.

Next, referring to FIG. 1, a microcomputer (9)
The conversion calculation of the frame to time by the method will be described. First, in step ST-101, frame data is read. Next, in step ST-102, it is determined whether or not the frame data is smaller than 30, and if smaller than 30,
If no, the process proceeds to step ST-104. In step ST-103, time data [hour, minute,
Then, the operation ends.

In step ST-104, 30 is subtracted from the frame data to make it new frame data. Then, in step ST-105, the second count value is incremented by 1 to obtain a new second count value. Then, step ST-
At 106, it is determined whether the second count value is 60 or more. If the second count value is 60 or more, the process proceeds to step ST-107, and if not, the process returns to step ST-102. In step ST-107, the second count value is reset to zero. Then, in step ST-108, the minute count value is incremented by 1 to obtain a new minute count value. Then, step ST-10
At 9, it is judged whether the minute count value is 60 or more, and 6
If it is 0 or more, it proceeds to step ST-110, and if it is not, it returns to step ST-102. In step ST-110, the minute count value is reset to 0. Then, in Step ST-111,
The hour count value is incremented by 1 to obtain a new hour count value, and then the process proceeds to step ST-102.

In the above description, it is assumed that one frame is (1/30) seconds, and the frame is converted into time. However, when the video signal recorded on the video disc is film-based, it is calculated from the Philips data. 1 frame is (1/2
Since 4) second frame data is obtained, one frame is converted and calculated as (1/24) second.

Next, referring to FIG. 2, a microcomputer (9)
A conversion calculation of time into a frame will be described. First, in step ST-201, time data is read. Next, in step ST-202, the time of the time data is multiplied by 30 × 60 × 60 and converted into a frame (this is designated as α). Next, in step ST-203, the time data is multiplied by 30 × 60 and converted into a frame (this is set to β). Next, in step ST-204, the seconds of the time data are set to 30
Double and convert to a frame (let's call it γ). Then, in step ST-205, steps ST-202, 203 and 204.
The frames α, β, and γ obtained in step 3 are added. Then
In step ST-206, the frame data is output and the operation ends.

FIGS. 1 and 2 have described the case where the frame is converted into time and the time is converted into frame in the search process of FIG. 3, but the conversion calculation is adopted to reproduce the video disc. The position or search value can be displayed on both the frame and time display (1 regardless of whether the video disc is a CAV disc or a CLV disc).
0) can be displayed. In that case, the operation of step ST-103 in FIG. 1 is replaced with “display of time data”, and after step ST-103, the operation is returned to step ST-101 again, and in FIG. The operation of ST-206 is replaced with "display of frame data", and after step ST-206, step ST-2 is executed again.
It should be returned to 01.

Thus, according to the disc reproducing apparatus described above, whether the disc to be used is a disc on which the frame data related to the information data and the data related thereto are recorded or the time data related to the information data is recorded on the disc. Regardless, it is possible to search and display the time data recorded on the disc by both the frame and the time.

In the above-mentioned embodiment, the case where the present invention is applied to the optical video disc reproducing apparatus has been described, but the disc may be an optical-magnetic disc or a magnetic disc, and the information signal recorded on the disc may be a video signal, an audio signal, a video signal. The type of signal, voice signal, data signal, etc. does not matter.

〔The invention's effect〕

According to the present invention described above, regardless of whether the disc to be reproduced is a disc on which the frame data associated with the information data is recorded or the disc on which the time data associated with the information data is recorded, It is possible to obtain a data reproducing apparatus capable of retrieving or displaying information data recorded on a disc by either frame or time.

[Brief description of drawings]

FIG. 1 is a flow chart of frame-to-time conversion calculation, FIG. 2 is a flow chart of time-to-frame conversion calculation, and FIG. 3 is a disk search flow chart.
FIG. 4 is a block diagram showing a video disc reproducing apparatus to which the present invention is applied. (9) is a microcomputer, (10) is a display, (1
2) is a switch, (14) is a system controller, (1
5) is a servo circuit, (16) is a disk, (17) is a motor, and (18) is a servo circuit.

Claims (1)

[Claims] 1. A disc reproducing apparatus for reproducing a disc on which information data and frame data related to the information data and a disc on which information data and time data related to the information data are recorded are converted. And a conversion means for converting time data into frame data.