JP2620242B2 - Random play method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a random play system in a DAT device (digital audio tape recording / reproducing device) and the like.
In particular, the present invention relates to a random play system in which a song recorded by pressing a random play key is played at random.

<Conventional Technology> Most of CD players, DAT devices, and the like have a program function in which a user programs a playing order of favorite songs and plays the order. Some CD players are provided with a random play key, and the microcomputer randomly rearranges the playing order of the tunes recorded by pressing the key to perform the order (shuffle play).

By the way, the reason why shuffle play can be performed in a CD player is that the number of songs, the song position, etc. (TOC information) recorded on the CD are recorded in the lead-in area of the CD.
This is because the system can easily read such information and recognize the number of songs.

<Problems to be Solved by the Invention> When performing such shuffle play by DAT, it is necessary to recognize the number of songs recorded on the tape. TO
If the C information is recorded at the beginning of the tape, the TOC information can be read to perform shuffle play, but if the TOC information is not recorded, it is necessary to identify the number of songs by fast-forwarding from the beginning to the end of the tape. It takes a considerable time before the shuffle play starts, which is not preferable. Note that the function of recording TOC information at the beginning of the tape is optional, and is not provided for all DATs. In most cases, TOC information is not recorded.

In view of the above, an object of the present invention is to provide a random play system capable of performing a shuffle play even if the number of songs recorded on a tape cannot be recognized.

<Means for Solving the Problems> According to the present invention, the above object is achieved by a means for randomly determining the order of music to be played assuming that a temporarily set number of music has been recorded on a recording medium. When the set number of music pieces is larger than the actual number of music pieces recorded on the recording medium and no music piece having a predetermined performance order exists on the recording medium, the music piece is skipped and the next music piece is skipped. This is achieved by means for searching for and playing a song having a subsequent performance ranking.

<Operation> Assuming that the tentatively set number of songs has been recorded on the recording medium, the order of the songs to be played is determined at random, and the set number of songs is recorded on the recording medium while performing in the determined order. If the number of music pieces having a predetermined performance order does not exist on the recording medium, the number of music pieces is skipped, and the music piece having the next or higher performance order is searched and played. If no music of a predetermined playing order is found even after searching to the end of the signal recording area of the recording medium, it is determined that the music of the playing order does not exist, and at the end position of the signal recording area of the recording medium. The music number is recognized as being the total number of music pieces recorded on the recording medium, and the music pieces having the performance order larger than the total number of music pieces are not recorded on the recording medium, and the music pieces of the next and subsequent music order are played.

<Embodiment> FIG. 1 is a block diagram of a main part of a DAT device for realizing a random play system according to the present invention, FIG. 2 is a flowchart of a process of the present invention, and FIG. It is a correspondence table between the playing order and the song number when (arbitrary number of songs) m is input.

11a and 11b are recording / reproducing heads, 12 is a signal processing unit, 13 is a microcomputer system controller, 14 is a tape traveling control unit, 15 is a tape traveling mechanism, 16 is an operation panel, and 17 is a sensor for detecting a tape end. is there.

The signal processing unit 12 stores the audio data read from the magnetic tape by the first and second recording / reproducing heads 11a and 11b in the built-in RAM in the reproduction mode, and performs error detection / correction for the audio data. After performing other processing, it is DA-converted and output, and further, the start ID, time code, music number (program number), etc. included in the subcode are identified. At the time of recording, the signal processing unit 12 attaches an error correction code to audio data input from an analog-to-digital converter (not shown) and records the data together with a predetermined subcode on a tape via the recording / reproducing heads 11a and 11b.

The tape running control unit 14 controls the tape running mechanism 15 in response to a command from the system controller 13 to fast-forward, rewind, and play back the tape appropriately.

Various operation keys are provided on the operation panel 16. As keys related to the present invention, 16a is a random play key for requesting shuffle play, and 16b is the maximum number of songs (arbitrary number of songs) to be shuffled. Is a numeric keypad for inputting a number.

Hereinafter, the overall operation of FIG. 1 will be described with reference to the flowchart of FIG.

To perform shuffle play, enter the maximum number m of songs to be shuffled from the numeric keypad 16a, and select a random play key (shuffle play key).
Is pressed (step 101).

When the shuffle play is requested, the system controller 13 sets the current position (the track number of the tape facing the head).
Is checked, if not, tape rewind is performed, and after rewind is completed, the current song number is set to zero (step 103). The system controller 13 counts up / down the current song number in accordance with the tape running direction each time the start ID indicating the beginning of the song is detected by the signal processing unit 12 and always recognizes the current song number. Shall be.

If the current song number can be recognized, the number of songs recorded on the tape M
Is known (step 104), and if known, M
→ m and “1” → F (step 105).
F is a flag indicating that the number of music pieces is known.

Thereafter, the system controller 13 randomly rearranges the playing order of the songs from the song number 1 (the song recorded at the head of the tape) to the song number m (the song recorded at the m-th), and order i (i = 1,2, ...... m ) and creates a correspondence table between music number m _i (see FIG. 3) stored in the internal RAM (step 106).

Next, 1 → i is set (step 107), and i>
m, in other words, it is checked that the performance of the requested m pieces has been completed (step 108), and if it has been completed, the shuffle play ends (step 109).

However, if i ≦ m, it is checked whether the flag F is “1” (step 110), and if “NO”, in other words, if the total number of songs recorded on the tape is not recognized, seeking i-th music number m _i from the correspondence table, or search for songs number curved (step 111).

Song music number m _i it is checked or not the search (step 11
2) If the search is not possible even when the tape end is reached (the tape end is detected by the sensor 17), the current track number becomes the number M of tracks recorded on the tape.
“1” → F is set (step 113), and thereafter i is incremented by i + 1 → i (step 114). Thereafter, the processing of step 108 and thereafter is repeated.

On the other hand, if F = “1” in the check at step 110, in other words, if the number of songs recorded on the tape is recognized, the total number of songs recorded on the tape is m.
Therefore, in step 115, the correspondence table (FIG. 3)
Seeking i-th play music number m _i from and compares the curved number m _i and the number of tracks m, i in step 114 as m _i> If m song music number m _i is absent Step 1
Repeat the processing after 08.

If it is determined in step 115 that m _i ≦ m, the music having the music number m _i is recorded on the tape.
Searches the song curved number m _i in 1, playing the search completion curved (step 116), if playing finished (step 117), step 108 and subsequent steps as i + 1 → i in the subsequent step 114 repeat.

<Effects of the Invention> According to the present invention, assuming that a tentative number of songs are recorded on a recording medium, a song order to be played at random is determined, and the songs are played in the determined order. If the set number of songs is larger than the actual number of songs recorded on the recording medium and a song with a predetermined playing order does not exist on the recording medium, the song is skipped and a song with the next or subsequent playing order is skipped. Because it was configured to search and play, shuffle play became possible immediately without recognizing the number of songs.

Also, since about two CDs of songs can be recorded on a DAT tape, shuffle play can be performed with only the songs of the first CD by inputting the number of songs recorded on the first CD.

[Brief description of the drawings]

FIG. 1 realizes a random play system according to the present invention.
FIG. 2 is a block diagram of a main part of the DAT apparatus, FIG. 2 is a flowchart of the processing of the present invention, and FIG. 11a, 11b: Recording / playback mode, 12: Signal processing unit, 13
…… System controller, 14 …… Tape running control unit,
15: Tape running mechanism, 16: Operation panel, 16a: Random play key, 16b: Numeric keypad, 17: Tape end sensor

Claims (1)

(57) [Claims] In a random play system in which a song recorded by pressing a random play key is randomly played, a song played randomly assuming that a temporarily set number of songs are recorded on a recording medium. The order is determined, the music is played in the determined order, and the set number of music pieces is larger than the actual number of music pieces recorded on the recording medium, and the music piece having a predetermined performance order ends in the signal recording area of the recording medium. If the search does not find any song, it is determined that there is no song of the performance order, and the song number at the end position of the signal recording area of the recording medium is recognized as the total number of songs recorded on the recording medium. A random play method characterized in that songs having a performance ranking higher than the total number of songs are not recorded on the recording medium and the songs having the following performance rankings are played.