JPH0748294B2 - Single time display method in DAT device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention relates to a single time display method in a DAT device (digital audio recording / reproducing device), and particularly reproducing even a tape on which single time data is not recorded. The present invention relates to a single time display method in a DAT device capable of performing single time display at times.

<Prior Art> A DAT device conventionally displays a single time during playback so that the elapsed time from the beginning of a song (called a single time) can be confirmed for each song. Specifically, as shown in FIG. 3, a subcode including a program number, a start ID, an absolute time, which is associated with a piece of music, and a single time is recorded in advance on a tape, and the single time is recorded during reproduction. It is designed to read and display the clock.

<Problems to be solved by the invention> In the case of a commercially available music tape (called a soft tape), a subcode including single time data is recorded in advance for each song, and it is only necessary to read the single time from the tape. There is no problem because it can be displayed, but if the single time is not recorded in the subcode on the tape created by the user, the single time cannot be displayed,
Therefore, there is a problem that the remaining time cannot be grasped, and the playing time cannot be confirmed when the tape is edited.

The present invention has been made in view of the drawbacks of the prior art,
It is an object of the present invention to provide a single time display method in a DAT device capable of performing single time display even if the single time is not recorded on the tape.

<Means for Solving the Problems> According to the present invention, the above object is to determine whether or not single time is recorded on a tape, and to read and display the single time when recorded. When it is not recorded, it is achieved by means for detecting the start ID recorded on the tape, means for measuring time from the time when the start ID is detected, and means for performing single time display by the time value.

<Operation> It is determined whether or not a single time is recorded on the tape, and if it is recorded, the single time is read and displayed. If not recorded, the start ID recorded on the tape is detected. The time counting is started from the time when the start ID is detected, and the single time display is performed based on this time counting value.

<Embodiment> FIG. 1 is a block diagram of an apparatus for realizing a single time display method according to the present invention, and FIG. 2 is a flow chart of a single time display process according to the present invention.

In FIG. 1, 11 is a recording / reproducing head (actually, there are two recording and reproducing heads, first and second recording / reproducing heads), 12 is a signal processing section, 13 is a main control section of a microcomputer configuration, and 14 is A play key, 15 is a tape feed control unit, 16 is a tape running mechanism unit, 17 is a count pulse generation unit, and 18 is a display unit.

The main control unit 13 controls the overall control of the device such as reproduction control based on pressing of the key 14 and single time display control according to a program stored in a memory (not shown), and the signal processing unit 12 during reproduction. When the sub code is input from and the single time data is present, the single time display is performed based on this data.When the sub code does not have the single time data, the rising edge of the start ID is detected and the count is made after detecting this. Pulse generator 17
The pulse sent from is counted up and pseudo single time data is created and displayed.

The signal processing unit 12 incorporates the audio data read from the magnetic tape by the first and second recording / reproducing heads 11 and 11 during reproduction.
The audio data is stored in M, and the audio data is processed for error detection, correction, and other processing, DA converted, and output to an external amplifier. Further, by the first and second recording / reproducing heads 11 and 11. Program number, start ID, absolute time data, using the subcode read from the magnetic tape,
The single time data is discriminated and output to the main control unit 13.

The count pulse generator 17 generates a reference pulse, for example, a pulse synchronized with the rotation of the rotary cylinder on which the first and second recording / reproducing heads 11 and 11 are mounted, and outputs the pulse to the main controller 13.

The display unit 18 displays the timetable based on the single time data sent from the main control unit 13.

The overall operation of FIG. 1 will be described below with reference to FIGS.

When the play key 14 is pressed and reproduction is instructed, the main control unit 13 sets the reproduction mode to the tape feed control unit 15 and the signal processing unit 12 to allow the tape to run at a predetermined reproduction speed and The processing unit 12 causes the audio data to undergo a predetermined digital processing, and the subcode SUB is read and output to the main control unit 13 (steps 100, 10).
2). At this time, the rotating cylinder (not shown) rotates at a predetermined rotation speed, and the count pulse generator 17 outputs count pulses of a predetermined cycle.

In the next step 104, the main control unit 13 determines whether or not the single time data exists in the subcode sent from the signal processing unit 12, and the single tape is being played back. If it has been recorded in advance (see FIG. 3), the single time data read from the tape is sent to the display unit 18 and displayed as the single time (steps 106 and 108).

Thereafter, during reproduction in the same manner, single time data is read from the tape one after another and displayed on the display unit 18 in single time (repeat of steps 102, 104, 106 and 108).

As described above, when the single time data is recorded on the tape in advance, the single time data is read from the magnetic tape at any time during the reproduction of the music and the single time display is performed. You can check the exact elapsed time from.

The rising line I in the single time in FIG. 3 indicates that the rising time P of the start ID bit is set to zero and after passing P, the single time increases as the tape advances.

Separately from this, when the tape being reproduced is a user-created tape and the single time data is not recorded on the tape, the main control unit 13 determines the subcode sent from the signal processing unit 12 in the determination of step 104. It is determined that there is no single time data inside. After that, it is judged whether the start ID bit recorded as the start position of the music in the subcode has risen from "0" to "1" (step 110), and if "NO", the count-up pulse is counted. Then, the single time is updated and displayed (steps 112 and 108), and thereafter, the processing from step 102 onward is repeated.

When the tape approaches the start position of the music in the process as described above, the rise of the start ID is detected in the determination of step 110, and the single time is cleared to zero (step 114).

As a result, the single time display immediately becomes 0:00:00, indicating the start of the song (step 10).
8).

After that, since the single time data does not exist in the subcode read from the tape and the start ID does not rise until the next song, the single time is counted up and displayed each time the count-up pulse is input.

As a result, the user can confirm the elapsed playing time from the start of the music even when the tape on which the single time data is not recorded is played back.

Then, when the music being reproduced is finished and the next music is started, "YES" is set again in step 110 and the single time is cleared, so that the elapsed playing time of the next music is also displayed.

In addition, in a user-created tape or the like, when single time data is not recorded in a certain portion of the tape, but single time data is recorded in another certain portion of the tape, the single time data is recorded. When reproducing the part where data is recorded, the judgment in step 104 is “YES”, so accurate single time display is made, while for the part where single time data is not recorded, start in the same way as above. After the ID is detected, a count-up pulse is input to display a single time that is artificially timed.

<Effects of the Invention> According to the present invention as described above, since the time measurement is started from the time when the start ID is detected and the single time display is performed from this time measurement value, the reproduction is performed even when the single time data is not recorded in the tape. You can check the elapsed time after the start of the hour song.

[Brief description of drawings]

FIG. 1 is a block diagram of an apparatus for implementing the present invention, FIG. 2 is a flow chart of single time display processing of the present invention, and FIG. 3 is an explanatory diagram of subcodes recorded on a tape. 11 …… Record / playback head, 12 …… Signal processing section, 13 …… Main control section, 14 …… Play key, 15 …… Tape feed control section, 16 …… Tape running mechanism section, 17 …… Count pulse generation Department

Claims (1)

[Claims] 1. A single time display method in a DAT device for displaying a single time, which is the elapsed time of each music, by determining whether or not the single time is recorded on the tape, and when the single time is recorded, the single time is read. When the start ID recorded on the tape is detected, the time is started from the time when the start ID is detected, and the single time display is performed based on this time value. Single time display method in DAT device.