JPH0519216B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a search method in a digital audio tape player (DAT device), and more particularly to a search method for preventing the beginning of a song from being played back without being cut off.

<Prior Art> When music is digitally recorded using a DAT device, a start ID can be recorded at the beginning of the song so that a desired song can be quickly searched later. That is, the DAT device is provided with a start ID key, and by pressing this key during recording, a start ID indicating the beginning of the song can be recorded.

<Problem to be solved by the invention> By the way, the start ID is usually written after the music is released, and in such cases, when searching, the start ID written at the beginning of the desired song is often written.
When the ID is detected and playback starts, the beginning of the song is cut off and cannot be listened to. In addition, in the case of commercially available music tapes (referred to as soft tapes), the beginning of the song will not be missing even if it is played from the beginning of the start ID.

In view of the above, it is an object of the present invention to provide a search method that does not cause the beginning of a tape to be cut off when playing back a tape created by a user (referred to as a user tape) after a search.

Another object of the present invention is to provide a search method that allows playback to be started immediately in the case of soft tapes.

<Means for Solving the Problems> FIG. 1 is a block diagram of an apparatus for realizing the search method according to the present invention.

11 is a recording/reproducing head, 12 is a signal processing section,
13 is a search control section, 14 is a search enable key, 15 is a tape feed control section, 16 is a tape running mechanism section, and 17 is a tape type detection sensor.

<Operation> When the search enable key 14 is pressed, the search control unit 13 performs fast forward search control and stops tape feeding when the start ID of the desired song is detected. After that, the search control unit 13 starts
Detect the beginning of the ID while moving it at playback speed.
When the beginning of the start ID of the desired song is detected, the tape type detection sensor 17 determines whether the tape currently set on the deck is a soft tape or a user tape, and if it is a user tape, the tape is rewound by a predetermined amount. If it is a soft tape, playback will start immediately without rewinding.

<Embodiment> FIG. 1 is a block diagram of an apparatus for realizing the search method according to the present invention, FIG. 2 is a flowchart of the search process according to the present invention, and FIG. 3 is an explanatory diagram of the search process.

In FIG. 1, 11 is a recording/playback head (actually, there are two recording/playback heads, first and second), 12 is a signal processing section, 13 is a search control section composed of a microcomputer, and 14 is a A search enable key, 15 a tape feed control section, 16 a tape running mechanism section, and 17 a tape type detection sensor for detecting whether the set tape is a soft tape or a user tape.

The signal processing section 12 is connected to the first and second recording/reproducing heads 1.
The audio data read from the magnetic tape by steps 1 and 11 is stored in the built-in RAM, and after error detection and correction and other processing are performed on the audio data, it is converted to DA and output, and then converted into subcode. It is designed to identify the included start ID, time code, program number, etc.
Incidentally, when the start ID is identified, the signal SF (see FIG. 3A) is output.

If the signal SF is generated while the tape is being sent in the forward direction, the search control unit 13 detects the rising edge of the signal and increments the current track number Ma by 1 (Ma+1→Ma), and increases the signal SF when the tape is being sent in the rewind direction. When SF occurs, its falling edge is detected and the current track number Ma is counted down by 1 (Ma
-1→Ma) and monitor the current song number Ma.

The tape type detection sensor 17 detects that if it is a soft tape (commercially available music tape), there is a hole in the tape pack at a predetermined position, and if it is a user tape (tape on which nothing has been recorded), there is no hole. This fact is used to detect tape identification using a switch or the like.

The overall operation of FIG. 1 will be described below with reference to FIGS. 2 and 3.

When the search enable key 14 is pressed to command a search for a desired song (step 100), the search control section 13 determines whether Ma<Ms (step 100).
102). Note that Ms is the desired desired song number.

If Ma<Ms, the search control unit 13 causes the tape feed control unit 15 to send the tape in the forward direction and search for the start ID of the desired song (steps 104 and 106, see FIG. 3B). The search in the forward direction in steps 104 and 106 is performed as follows with reference to FIGS. 3A, B, and C.

In other words, feed the tape using fast forward (FF),
If the start ID is detected and the signal SF is generated,
The search control unit 13 increments the current song number by one each time (Ma+1→Ma). And Ma=
In other words, if the start ID of the desired song is detected, the search control section 13 causes the tape feed control section 15 to stop tape feeding. After that, the tape is sent in the rewind direction at a review speed that is slower than the fast-forward speed but faster than the playback speed (play speed) (as shown in Figure 3 B and C).
(See REV search). The reason why the review speed is slower than the fast forward speed and faster than the playback speed is as follows.
This is because if the fast forwarding speed is set, the amount of overshoot after detecting the beginning of the start ID becomes too large, and if it is set equal to the playback speed, it takes time until the beginning of the start ID is detected.

Next, check whether the start ID detection range SDR has been passed. Start ID detection range
If the SDR is passed, that is, if the beginning of the start ID is detected, the search control unit 13 causes the tape feed control unit 15 to temporarily stop tape feeding.
In this case, since the stop position is sent at the review speed, the amount of overshoot is small and it is not far from the beginning of the start ID.

After that, start while in Miyuto state.
The tape is fed in the playback direction at the playback speed until it reaches the ID detection range SDR, that is, until it reaches the beginning of the start ID (PLY
(see search). In addition, sending at the playback speed is as follows: (1) If you want to stop at the beginning of the start ID, start ID
This is because there is no overshooting after detecting the beginning of , and it is possible to stop immediately at that position. Also, (2) if you want to shift to playback without stopping, mute is canceled at the start ID beginning position and playback continues as it is. This is because it can be done.

When the start ID detection range SDR is reached, the search control unit 13 determines whether the tape set on the deck is a user tape or a soft tape based on the signal from the tape type detection sensor 17 (step 108), and determines whether the tape set on the deck is a user tape or a soft tape (step 108). If so, the dotted line in Figure 3 C
Play the tape at or near playback speed for a specified period of time (e.g., several seconds) as indicated by REV PLY.
Rewind (step 110), then release mute and start playback, or if it is a soft tape, release mute immediately and start playback without rewinding as shown in Figure 3B (step 112). ).

On the other hand, in step 102, if Ma≧Ms, the search control unit 13 changes Ma+1→Ma, and also causes the tape feed control unit 15 to feed the tape in the rewind direction to search for the start ID of the desired song ( Steps 114 and 116, see Figure 3 D and E). Note that the search in the rewind direction in steps 114 and 116 is performed as follows.

That is, when the tape is fed by high-speed rewind feeding (REW) and the start ID is detected and the signal SF is generated, the search control unit 13 counts down the track number Ma by 1 each time (Ma-1→
Ma). Then, if Ma=Ms, in other words, if the start ID of the desired song is detected, the search control section 13 causes the tape feed control section 15 to stop tape feeding. Thereafter, the tape is sent in the forward direction at a cue speed that is slower than the fast forward speed but faster than the playback speed (see CUE search in FIGS. 3D and E). Next, it is checked whether it has entered the start ID detection range SDR. When the start ID detection range SDR is entered, the search control unit 13 immediately sends the tape in the rewind direction at the review speed (REV search). When the REV search passes the start ID detection range SDR, the tape is kept in the mute state and is fed in the playback direction at the playback speed until it reaches the start ID detection range SDR (PLY search).

When the start ID detection range SDR is reached, the search control unit 13 determines whether the tape set on the deck is a user tape or a soft tape based on the signal from the tape type detection sensor 17 (step 108), and determines whether the tape set on the deck is a user tape or a soft tape (step 108). If so, the dotted line in Figure 3 E
REV PLY rewinds (steps) the tape at or near playback speed for a predetermined amount of time.
110), then mute is canceled and playback is started, and if it is a soft tape, mute is immediately canceled and playback is started without rewinding as shown in FIG. 3D (step 112).

<Effects of the Invention> According to the present invention, after the start ID of a desired song is detected by a fast-forward search, the beginning of the start ID is detected while being fed at the playback speed, and if the tape is a user-created tape, the start ID is detected. After the beginning of the tape is detected, the tape is returned by a predetermined amount, and then playback is started.If the tape is a commercially available soft tape with music recorded, after the beginning of the start ID is detected,
Since playback is configured to start immediately, in the case of a user tape, even if the start ID is recorded after the music starts during recording, there will be no cutoff at the beginning of the playback after the search. In addition, in the case of a commercially available soft tape with recorded music, start
Playback can be started immediately after the beginning of the ID is detected, so
The time until playback can be shortened.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an apparatus for realizing the present invention.
FIG. 2 is a flowchart of the search process of the present invention, and FIG. 3 is an explanatory diagram of the search process of the present invention. 11... Recording/playback head, 12... Signal processing section, 13... Search control section, 14... Search enable key, 15... Tape feed control section, 16...
... Tape drive mechanism section, 17 ... Tape type detection sensor.

Claims (1)

[Claims] 1. Subcode data including a start ID indicating the beginning of a song is recorded on a magnetic tape together with audio data, and by detecting the start ID, the current song number can be grasped and the desired song can be selected. In a search method that performs a search, after the start ID of a desired song is detected by a fast-forward search, the beginning of the start ID is detected while being fed at the playback speed, and the tape type detection means determines whether the tape is a user-created tape or not. Detects whether it is a commercially available soft tape with recorded music, and if the tape is a user-created tape, starts.
After detecting the beginning of the ID, return the tape by a predetermined amount, and then
A search method characterized in that playback is started, and if the tape is a commercially available soft tape with musical recording already performed, playback is started immediately after a start ID is detected.