JPS6224362Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a disk record that can accurately display the remaining time of a program.

During playback, the video disc player selects the 17th H of the vertical blanking section of the video disc record.
The playback position is displayed on the TV screen by detecting the frame number superimposed on the 18th H, and it is possible to confirm the playback position. However, in order to check the remaining time of a program during playback, it is possible to estimate the approximate remaining time by detecting the frame number being played, the playback position of the backup, and the outer diameter of the video disc record. There was no way to check the exact time remaining. Particularly, when a plurality of programs are recorded on the same record surface, the outer diameter of the record, the frame number, and the pick-up playback position do not provide any clues for displaying the remaining time.

Therefore, the present invention records the program time information of each program and the playback progress information (playback position information) for each program on the disk record that records main information such as video signals. The purpose is to provide a new disk record that can be displayed.

The present invention will be described below with reference to an illustrative embodiment. First, in this embodiment, the present invention is applied to a well-known video disc record that reproduces video signals using an optical video disc player, and such a video disc record records FM video signals in a spiral shape. The 17th H of the vertical retrace section of the video signal.
As is well known, a total frame number of 24 bits (total playback progress information) including the identification code of the upper 4 bits is encoded as a bi-phase code and recorded in a superimposed manner on the 1st and 18th H. It is also equipped with a circuit that detects the frame number by extracting and decoding the biphase signal during playback.

Therefore, in this embodiment, no signal is superimposed on the 14th and 15th H in the vertical retrace interval of such a video disc record, and the video disc player detects the frame number encoded in the biphase code. In view of this, the program frame number (program time information) _S1 and the frame number for each program (playback progress information) _S2 are encoded into a biphase code similar to the frame number described above. each number
This is superimposed recording on the 14th and 15th H.

FIG. 1 schematically shows the waveform diagram of the 14th and 15th H obtained after FM demodulation of the FM video signal reproduced from the video disc record of this embodiment. The encoded 24-bit signals are respectively expressed in hexadecimal notation as “05650” and “00E10”, and the contents are that the program frame number S ₁ is 18000 and the program frame number S ₂ is 3600. , i.e. 10
This shows that the program for 20 minutes has been played for exactly 2 minutes.

The circuit block diagram in Fig. 2 shows a circuit for calculating the remaining time after reading and storing such a biphasic code and displaying it on a part of the television screen. The reproduced video signal is input to a decoding circuit 2 that decodes the biphasic code and a sampling pulse generation circuit 3 that generates sampling pulses corresponding to each signal multiplexing area in the vertical retrace section. 14th H, 15th H
According to each sampling pulse of the 1st and 17th H, the data is stored in a frame number storage circuit 4, a frame number recording circuit 5, and a total frame number storage circuit 6, which are constituted by a shift register. Note that the OR output input to each of the storage circuits is a shift pulse, and the OR input derived from the decoding circuit 2 is a synchronization pulse synchronized with the decoding output. In this embodiment, each bit output of the frame number storage circuit 4 and the frame number storage circuit 5 is inputted to a subtraction circuit 7 to calculate the remaining number of frames, and a multiplexer which takes the subtraction output and the frame number as selection inputs is used. Reference numeral 8 selects an input signal using a control output CN, and the selected output is converted from a frame display to a seconds display by a switching circuit 9 at the next stage, and inputted to a character generator 10, which is a character generator synchronized with the video signal. The generator output is superimposed on the video signal. Therefore, the elapsed time and remaining time of the program are selectively displayed on the television screen on which the reproduced image is displayed.

In the above-mentioned embodiment, the number of frames of the program and the number of elapsed frames of the program are superimposed on the vertical retrace interval, but the present invention can also record second information instead of frames, and can also record the number of elapsed frames on the number of elapsed frames. Needless to say, the number of remaining frames may be recorded instead.

[Brief explanation of the drawing]

FIG. 1 shows a waveform diagram of a superimposed signal according to an embodiment of the present invention, and FIG. 2 shows a main circuit block diagram of the embodiment. Explanation of the main figure numbers, S ₁ ... frame number, S ₂ ... frame number.

Claims (1)

[Claims for Utility Model Registration] (1) In a disk record in which a spiral recording track is formed by recording information made by multiplexing total playback progress information at a predetermined period with respect to main information consisting of a plurality of programs, the above-mentioned A disc record characterized in that program playback progress information set for each program is multiplexed on the recording information at the predetermined period, and program time information of each program is recorded on the recording track. (2) The disc record according to claim 1, wherein the main information is a video signal. (3) The disk record according to claim 1 or 2, wherein the predetermined period is a frame period.