JPS647435B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an information recording system such as a disk record that can accurately display the remaining time of a program.

For example, when a video disc player plays back the vertical blanking section of a video disc record,
The playback position is displayed on the TV screen by detecting the frame number (total playback progress information) superimposed on the 17th and 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 pick-up playback position, and the outer diameter of the video disc record. There was no way to check the exact time remaining. In particular, 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 program time information for each program and playback progress information (playback position information) for each program on a recording medium such as a disk record that records main information such as a video signal. The aim is to provide a new disc record that can display the remaining time.

The present invention will be explained below according to an illustrative embodiment. First, in this embodiment, the present invention is applied to a well-known video disc record that reproduces a video signal using an optical video disc player, and such a video disc record records an FM video signal 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 at the 1st and 18th bits, and the video disk player 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 converted 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, 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
The data is stored in a frame number storage circuit 4, a frame number storage circuit 5, and a total frame number storage circuit 6, each consisting of a shift register, according to the sampling pulses of the 1st and 17th hours. 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 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 receives the subtraction output and the frame number as selection inputs is used. 8 selects an input signal by a control output (CN), and the selected output is converted from a frame display to a second display by a conversion circuit 9 at the next stage, and is inputted to a character generator 10 and synchronized with the video signal. The character 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 drawings]

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)

[Scope of Claims] 1. In an information recording method in which a recording track is formed by recording information obtained by multiplexing total reproduction progress information at a predetermined period with respect to main information consisting of a plurality of programs, An information recording method characterized in that program playback progress information set for each program is multiplexed at a predetermined period, and program time information of each program is recorded on the recording track. 2. The information recording system according to claim 1, wherein the total reproduction progress information and the program reproduction progress information have a common multiplexing cycle. 3. The information recording system according to claim 1, wherein the main information is a video signal.