JPS60258751A - Method for controlling fast feed program search - Google Patents

Abstract

PURPOSE:To attain sure head locating by continuing rapid traverse until the 1st prescribed time is elapsed after the head of music is detected, switching the mode to the rewinding and switching the mode to the playing with intermusic detection after the 2nd prescribed time is elapsed. CONSTITUTION:When the intermusic part is detected, the tape feeding direction is not inverted even being entering the next music (music to be played) and rapid traverse is continued for a time t3. Then the mode is brought into the rewinding mode REW, the tape feeding direction is inverted and the mode enters the rewinding program search. The count start of the time t3 is executed after the music head is detected. the mode enters the repid traverse stop and rewinding after the elapse of time t3, and even when the head is in the music recording, it is possible to output no-tone, and when the intermusic part of the music is overlapped, it is possible for mis-discrimination as the intermusic part even in the music. The time t4 is a rewinding and head locating inhibition section in order to avoid it and selected as, e.g., 200m. Thus, the rapid-traverse head locating is executed surely from any position of the tape.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a fast-forward cue control method on a magnetic tape on which a plurality of songs are recorded with silent sections between the songs.

[Conventional technology]

Ongaku Sumo Soto records multiple songs with gaps between them, so you can quickly retrieve the song n songs ahead or after the current song by fast forwarding or rewinding while counting the gaps between songs. ) and play it.

Conventional cueing in fast forward is as shown in Figure 4 (al), which advances the tape in the same direction as the playing direction P but at high speed (arrow F
F), fast-forwarding stops between songs when the number of inter-songs reaches the specified number, and the next song starts playing, but the silence between songs is detected, and the silence during the song In order to distinguish between songs, it is determined that silence continues for a predetermined time (inter-song judgment time) t1 or more, and then it is determined that there is no sound between songs.Then, the start of the next song is detected, fast-forwarding is stopped, and the coasting tape is completely stopped. By the time it stops, the head has entered the next song, so when fast forwarding is stopped as shown in the figure, it is rewound slightly and REW is performed, and then the playing state is set.

The required rewind amount is such a length that the tape, which has been fast-forwarded or stopped, is returned so that the head stops between tracks, and varies depending on the tape speed, operational delay of the control system, etc. However, in conventional fast-forward cueing, the average rewinding time of the required rewinding time at the beginning of tape winding and that at the end of tape winding is determined, and rewinding is performed anywhere on the tape within that time. However, it is fine if the amount of tape is small and there is not much difference in winding speed between the start and end, but with a large amount of tape, such as a 120 minute cassette tape, there is a considerable speed difference between the start and end. , the beginning of the song often does not appear when rewinding for a certain amount of time.

To further explain this in FIG.
C1 is a diagram illustrating fast-forward cueing at the end. (
In case a), even in fast forwarding, the winding side coil diameter is small at the tape starting end, so the tape speed is small, and therefore the amount of overshoot is small. However, in this state, the rewinding speed is high, so that a considerable amount of rewinding is performed for a certain period of time, and there is a risk that the head will pass through the gap between songs and enter the rear end of the previous song.

FIG. 6(a) shows this state. (In the case of BL, both fast forwarding and rewinding are at the same speed, and are rewound by the amount of overshoot (designed in this way), which is appropriate.

Next, in case (C), the fast forward tape speed is high and the amount of overshoot is large. Since the tape rewinding speed is slow, rewinding for a certain amount of time may not be enough to rewind the tape, and the head may not be able to reach between songs, and may end up at the beginning of the song that should be played. . FIG. 6(b) shows this state.

To find the beginning of a rewind, as shown in Figure 4 (bl), rewind and stop rewinding when the number of inter-track intervals reaches the specified number, reverse the tape feeding direction, and switch to PLAY. The song interval detection is also performed when the silent state continues for a predetermined time t2.To give a numerical example, the song interval determination time t2 is approximately 8.
It is 0 mS, which is 2.48 when converted during performance. Head plunger suction time is 200m5. The channel switching plunger adsorption time is 50m5, and during these times it coasts in the rewinding direction and then reverses, but
Since the channel switching time is 500 m5, the performance state starts after that. These time relationships are shown in FIG. In this way, when rewinding and cueing, the playing state begins approximately 2 seconds before the start of the song to be played, and cueing can be performed reliably.

In addition, ((J in FIG. 4) is an example of the tail end of fast forwarding, but in this case, there is a drawback that it is difficult to reach the beginning of the song on a tape with long gaps between songs.

[Problem 3 to be solved by the invention: When rewinding to the beginning of a song, immediately after detecting the beginning of the song, the reversal, PLA
All you have to do is set it to the Y state, and there is no need to perform rewind operations like fast-forwarding. For this reason, when rewinding the tape, it is possible to more accurately locate the tape, regardless of whether it is at the beginning or end of tape winding, compared to when fast forwarding the tape. Therefore, if the beginning of the song is detected in fast forward and the beginning of the song goes too far before it stops, use this to actively cause a large overshoot, and if you go back and start the beginning, you will be able to rewind and start the beginning of the song. ,
It is possible to perform fast-forward cueing that operates reliably regardless of the beginning or end of the tape. The present invention is based on such an idea, and attempts to perform reliable cueing by converting fast-forward cueing into rewind cueing.

[Means for solving problems]

The present invention is a fast-forward cue control method for a magnetic tape on which a plurality of songs are recorded with silent parts between the songs. Fast forwarding is continued until the first predetermined time has elapsed after the detection, and when the predetermined time has elapsed, it is switched to rewinding, and after the predetermined time of the subsequent dyeing 2 has elapsed, it enters the inter-track detection. This feature is characterized by switching to a musical performance. The configuration and operation will be described in detail below with reference to embodiments.

〔Example〕

FIG. 1 is a diagram illustrating fast-forward cueing according to the present invention. As shown in the figure, in the present invention, once a song interval is detected, the tape feeding direction is not reversed even when the next song (music to be played) is started, and fast forwarding is continued for a time t3.

After that, the tape feeding direction is reversed as rewinding REW,
Start rewinding and cueing. tl is the time for determining between songs during fast forwarding, which is similar to the time for determining between songs during rewinding, t2.
2.4 seconds or more in LRY conversion. The time t3 for actively continuing fast forwarding is, for example, 500 mS. Even if a song interval is detected during fast forwarding, if the song interval (silence) still continues, fast forwarding is continued and timing of time t3 is not started. Timing at time t3 starts after the beginning of the next song is detected. After time t3 has elapsed, fast forwarding stops and rewinding begins, but at this time the head may output silence even if it is in the middle of a song, and if this overlaps with a silent part of the song, it may be mistaken for an inter-song period even though it is in the middle of a song. There is a risk of judgment. The time t4 is a rewinding cue prohibition period to avoid this, and is set to 200 mS, for example.

FIG. 2 is a block diagram showing the structure of a cassette tape player, in which 10 is a mechanical part of a tape deck, 12 is a controller/roller thereof, and specifically consists of a 1-chip microcomputer. 14 is a key operation section, and 16 is a display device, which are provided at appropriate locations such as on the front panel of the player. 18
20 is a clock circuit for supplying a clock to the controller; 22 is a driver for driving the display unit 16; and 24 is a driver for driving the deck mechanism section 10. A speaker 26 is driven by the output of the head 10a via an equalizer 30 and an amplifier 30. 32 is a song interval detection circuit. The third fast-forward cue of the present invention is performed by the controller 12.
The process will be explained below using the flowchart shown in the figure.

First, it is checked whether it is APS (auto program search: cueing), and if it is not APS (N), the illustrated cueing process is not performed. If the tape is in APS mode (Y), it is checked whether the tape is being rewound, and if it is not rewinding (N), it is checked whether it is fast forwarding or not. If silence continues for the time t1, it is an inter-song period, and when the number of cents between songs is detected, the beginning of a song is detected. The beginning of a song is detected when it changes from silence to sound, and in this case, there is no judgment time between songs (as soon as there is sound, the beginning of the song is detected. Then, the time t3 is counted, and when the time has elapsed, the process moves to rewinding and cueing.

As shown in the flowchart of FIG. 3, the rewinding cue is also performed in the APS mode and under the condition that rewinding is in progress.
Fast forward cueing results in rewinding cueing after the fast forwarding operation is processed. First, the mode is switched from fast forwarding to rewinding, and it is checked whether or not time t4 has elapsed. In this example, when 0.2 seconds have elapsed at t4, the process moves to a song interval determination, and if a song interval is detected, it is reversed and the mode is set to PLAY. At this point, the APS mode is turned off, that is, the APS flag is removed.

Even in the APS mode, cueing is not performed unless rewinding, fast forwarding, and PLAY is in progress; conversely, in PLAY, track number counting processing and PLAY operation processing are performed. That is, APS is executed when the REW or FF key is pressed.

The APS mode is set by pressing the APS switch, and the number of songs to be skipped is set by the number of times the APS switch is pressed. The process shown in FIG. 3 is performed as one of various processes performed by the controller 12, and when the process shown in FIG. 3 is completed, the process moves to the next process.

〔Effect of the invention〕

As explained above, according to the present invention, fast-forward cueing can be performed reliably from anywhere on the tape, and is extremely effective.゛

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of the fast-forward cueing operation of the present invention, FIG. 2 is a block diagram showing the configuration of the tape player, FIG. 3 is a flowchart of the processing performed by the controller, and FIGS. 4 to 7
The figure is an explanatory diagram of conventional cueing. In the drawings, t3 indicates a first predetermined time, t4 indicates a second predetermined time, FF indicates fast forwarding, REW indicates rewinding, and PT-AY indicates performance. Applicant Fujitsu Ten Ltd. Representative Patent Attorney Minoru Aoyagi Figure 4 (d) 1, t (→ j$5 days

Claims (1)

[Claims] In a fast-forward cue control method for a magnetic tape on which multiple songs are recorded with silent parts between the songs, when fast-forwarding and detecting the gap before the song to be played, after the beginning of the song is detected. Continuing fast forwarding until a first predetermined time has elapsed, switching to rewinding when the predetermined time has elapsed, then entering inter-song detection after a second predetermined time has elapsed, and switching to performance at the inter-song detection. A fast-forward cueing control method featuring: