JPH069113B2 - Remaining amount display device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [A. Field of Use] The present invention relates to a display device for displaying a remaining amount of reproduction time that can be used in, for example, a digital audio disc player.

[B. Background of the Invention]

In the recently proposed optical digital audio disc, an audio signal is digitized and recorded in a spiral track, and the song number of the audio signal (for example, a music song) and the playing time of the song are recorded. A control signal indicating information such as total reproduction time is also recorded.

[C. Conventional technology]

When the disc on which the control signal is recorded is played back to the player, the playback time of the song (elapsed time from the start of playing the song) or the total playback time (total from the start of playing the first song) The elapsed time of) was displayed. However, from the standpoint of the user of the player, for example, when performing dubbing or the like, rather than knowing the playing time and the total playing time, the remaining playing time of one song or the remaining playing until the end of the disc is played. Sometimes it is more convenient to know the time etc. The conventional player cannot know the remaining amount (remaining time).

[D. Object of Invention]

The present invention, at any reproduction time point, can display the remaining reproduction amount of the information block (song, etc.) including the time point or the remaining reproduction amount up to the reproduction end point of the recording medium by, for example, the remaining time. It is intended to provide a quantity display device.

[E. Configuration of the present invention]

The present invention is an information recording medium to be reproduced (for example, a disk).
On the other hand, in addition to the original information, the start time display signal indicating the position of each information block (for example, the start position) by the total amount (for example, the total time) from the beginning of the disk and the current reproduction position at each time point are displayed. Assuming that the total playback time display signal indicated by the total elapsed amount (eg, total elapsed time) from the beginning of the disk is recorded, the remaining amount (eg, remaining time) at an arbitrary playback position of the disk. Is calculated from the difference between the start time display signal and the total reproduction time display signal, and this is displayed.

[F. Example〕

FIG. 1 shows a simplified structure of one frame of a signal digitally recorded on a disk. A sync signal for synchronizing signals, a data signal indicating audio information such as music, a vertical error detection and correction code for detecting and correcting data errors, and a control signal [song number of audio information (for example, music song), song Signal indicating reproduction time, total reproduction time, etc.].

FIG. 2 shows a simplified signal recording form of the entire disk. In the example shown in FIG.
This is an example in which music is recorded, and a lead-in signal is recorded at the beginning of the disc and a lead-out signal is recorded at the end. These songs and signals are, of course, composed of an infinite number of the frames. The playback time of the first song is 12 minutes and 50 seconds, the second song is 22 minutes and 50 seconds, and the third song is
It is assumed that the tune is 7 minutes and 30 seconds and the fourth tune is 13 minutes and 50 seconds (see FIG. 2).

Now, in the control signal of the frame which constitutes the portion where the music information is recorded (that is, the portion of the first to fourth songs), the reproduction time of each music, the total reproduction time and the music number are as shown below. It is recorded in.

The reproduction time of each song is sequentially recorded, with the start time of each song as 0. For example, a reproduction time of "3 minutes" is, of course, recorded at a position 3 minutes after the start. This time indicates the current playback position by the elapsed time from the beginning of the song.

The total reproduction time is sequentially recorded over the entire disk, with 0 at the end of the lead-in signal. This time indicates the current reproduction position as a total elapsed time from the beginning of the first music piece.

Further, similarly, as for the song number, the same song number is repeatedly recorded in the song by using the control signal.

On the other hand, in the control signal that constitutes the lead-in signal part, all the song numbers recorded on the disc and a signal indicating the position of the song, for example, the playback start position (playback start time) It is recorded in. Therefore, 0 minutes 0 seconds is recorded for the first song number, 12 minutes 50 seconds is recorded for the second song number, and 43 minutes 10 seconds is recorded for the fourth song number. . 57 minutes and 0 seconds are recorded for the lead-out signal.

An apparatus according to the present invention for displaying the remaining time when the disk having the above-described structure is reproduced will be described with reference to FIG.

The signal read from the disk is reproduced by the signal reproducing circuit (1) to derive the audio signal and the control signal. Then, the control signal is extracted by the control signal detection circuit (2). Of the control signals, the control signal of the lead-in signal portion is guided to the first storage means (4) side by the multiplexer (3), so that the music number and the reproduction start time corresponding thereto are sequentially stored. . The control signal of the audio information portion is guided to the second storage means (5) and the third storage means (6), the song number is stored in the third storage means (6), and the total reproduction time is stored in the second storage means.
Guided by (5). The read output of the second storage means (5) becomes one input of the subtraction circuit (7) and is selected by the multiplexer (8) among the plurality of read outputs of the first storage means (4), and any one of them is subtracted. This is the other input of the circuit (7). The memory contents of the storage means (5, 6) are sequentially updated as the reproduction progresses.

Now, it is assumed that the multiplexer (8) is controlled by the read output of the third storage means (6) which stores the music number, and the second music is reproduced. Then the multiplexer
At (8), the reproduction start position time of the third music piece is selected, and this is one input of the subtraction circuit (7). Therefore, if the total playback time is, for example, 20 minutes and 40 seconds, the subtraction circuit (7) performs the subtraction of the calculation start time of the third music of 35 minutes and 40 seconds minus 20 minutes and 40 seconds. Display means (9)
Indicates that the remaining time of the second song is 15 minutes and 0 seconds.

If the multiplexer (8) is not controlled by the output of the third storage means (6) but manually controlled, the remaining time up to an arbitrary song number can be displayed. For example, if the reproduction start time of 57 minutes of the lead-out signal is manually selected, the remaining time of 36 minutes and 20 seconds until the end of the disk is displayed.

[G. effect〕

It is extremely convenient for the player who uses the player, since the more necessary remaining amount can be displayed.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram showing the structure of a frame that serves as a signal storage unit when information is digitally stored on a disk, and FIG. 2 is a diagram showing a signal recording mode of the entire disk, and FIG. FIG. 3 is a diagram showing a remaining amount display device according to the present invention. (4) is first storage means for storing the reproduction start time, (5) is second storage means for storing the total reproduction time, (6) is third storage means for storing the song number, and (7) is a subtraction circuit. , (9) is a display means,
(6) is a tune number memory that serves as third storage means, and (8) is a multiplexer that serves as reading means.

Claims (1)

[Claims] 1. A lead-in area records a plurality of song numbers and playback start position information and lead-out start position information of songs corresponding to each song number, and main information together with total playback position information in the main information area. A first device for storing, in a device for reproducing a recording medium for recording a music number, the reproduction start position information and the lead-out start position information reproduced from the lead-in area prior to the reproduction of main information. Storage means 4, second storage means 5 for updating and storing reproduction position information reproduced during the reproduction period of the main information, and third storage for updating and storing music number reproduced during the reproduction period of the main information Means 6, selection means 8 for selectively deriving the lead-out start position information from the first storage means, or the reproduction start position information corresponding to the music piece next to the music piece number read from the third storage means, and the selection means 8. hand Subtraction means 7 for subtracting the reproduction position information read out from the second storage means from the lead-out start position information or the reproduction start position information derived from the subtraction means, and the total remaining amount or during reproduction based on the calculation result of the subtraction means. And a display means 9 for displaying the remaining amount of the tunes, respectively.