JPS6013068Y2 - magnetic tape playback device - Google Patents

Description

[Detailed explanation of the invention] In this invention, the portion where signals are recorded on the tape is played back at a constant speed, and the unrecorded portion is automatically fast-forwarded to shorten the time until the next playback portion. , in the case of a tape with multiple tracks, it automatically starts fast-forwarding from the end of the recording on the first track, reverses at the end of the tape, fast-forwards to the beginning of the recording on the second track, and then goes into constant-speed playback mode. The present invention relates to a magnetic tape playback device that can perform the following functions.

Conventional tape recorders run at the speed at which the unrecorded portion of the tape remains in the playback state while the tape is running, so it takes time to play the next recorded portion, and several different recordings are recorded in one. When using tape, continuous playback of tapes had the disadvantage that the waiting time was longer than necessary.

The present invention solves the above-mentioned drawbacks of the conventional tape recorder, and has developed a magnetic tape recorder that not only allows you to quickly play the next side of a tape after it has finished playing it, but also allows you to quickly select any song. A magnetic tape developed for the purpose of providing a tape playback device, in which operations such as fast-forwarding and playback of a tape recorder are controlled by a control circuit controlled by a signal detection circuit that detects the intervals between songs. It is a playback device.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to embodiments and drawings.

In FIG. 1, the output of the playback head 2 that contacts the tape 1 (see the dotted line) is input to the playback amplifier 3.The output of the playback amplifier 3 is branched into two parts, one of which is the audio output P. The other signal is input to the signal detection circuit 4 to detect the song interval.

This signal detection circuit 4 detects a non-signal portion of the tape in progress, detects that the time of this non-signal portion has exceeded a predetermined time, and detects the signal portion of the tape in progress. When detected, a control signal is sent out, and a known song interval detection circuit (usually the song interval is about 4 to 8 seconds) can be used.

The output of the signal detection circuit 4 is input to the control circuit 5.

The three outputs of the control circuit 5 are respectively connected to solenoids 6, 7, and 8 to control them.

These solenoids 6, 7. The mechanism by 8 and the drive mechanism for the reel stand are similar to known ones, and the head base 9 fixes the head 2 by the solenoid 6.
The head 2 is brought into contact with and separated from the tape 1 by moving the head 2.

When the solenoid 7 is turned on, the pinch roller 10 connected thereto is pressed against the capstan 11 to cause the tape 1 to run at a constant speed in the forward direction (positive direction).

The solenoid 8 is connected to the pinch roller 12, and presses the capstan 13 and the pinch roller 12 together when the solenoid 8 is turned on. Make it run fast.

In this case, the solenoid 7 on the right side in the figure is turned off, and the pinch roller 10 is pressed against the capstan 11 against the spring force of the spring 7a.

Next, the operation of the apparatus of the present invention constructed as above will be explained.

First, in the normal playback state, the head base 9 is moved (upward in the figure) by the operation of the solenoid 6, similar to the known mechanism, and the head 2 is brought into contact with the tape 1, while the pinch roller 10 is turned on with the solenoid 7 turned on. The tape 1 is sandwiched between the capstan 11 and pressed, and the tape is run at a constant speed for playback operation.

In this case, the solenoid 8 is in the OFF state, and the pinch roller 12 is separated from the capstan 1'3 by the spring 8a, and there is no problem in running the tape 1.

At the position where the tape 1 is being recorded, each output of the control circuit 5, which outputs the output from the signal detection circuit 4 in response to the signal from the reproduction amplifier 3 as described above, operates the solenoid 6, turns on the solenoid 7, and turns on the solenoid. 8 is turned off to maintain the playback state as described above.

Next, if the non-recording state of tape 1 continues for a certain period of time (statistically 4 to 8 seconds), that is, in the case of music, if the interval between songs continues for the above period of time, the signal from head 2 disappears during that time, and the signal is detected. It is determined by the circuit 4 that the no-signal time has exceeded a predetermined time (inter-song time), and the control circuit 5 is activated to turn off the solenoid 7 (the solenoid 8 remains turned off). Pinch roller 1 for constant speed running in the normal direction, unlike the case of regeneration.
0 is released from the pressure on the capstan 11, and the tape runs in a kind of fast-forward state.

In this case, the head 2 either keeps pressing the tape 1 to detect the signal for the next recording (next song) on the tape 1, or uses another known mechanism to detect the signal of the next recording (next song) on the tape 1. The head 2 may be separated from the tape 1 to the extent that the signal can be detected.

Next, when the next recording signal exists on the tape 1 (the beginning of the recording signal), it is detected by the signal detection circuit 4, and the control circuit 5 returns to the above state again to perform constant speed reproduction.

At this point, the signal from tape 1 changes the fast-forwarding state to constant speed running, so in order to prevent the beginning of the recorded signal from being cut off, immediately after detecting the beginning of the recorded signal, the tape is temporarily moved for the necessary time. 1 is fast-forwarded in the reverse direction to return to the beginning of the recorded signal and enter the playback state.

To explain the above in terms of the relationship between the tape surface and the mechanism, it is assumed that the tape 1 moves in the direction of the arrow in FIG.

The shaded area is the recording area, and the unrecorded areas such as between songs are unmarked.If the lower side of the tape 1 is the mechanical operation, the mechanism is in the operating state (PB) in the shaded area. FT).

Next, in the case of a plurality of tracks, for the sake of simplicity, the operation at the tape end in a two-track tape will be explained with reference to FIG.

In the first track A, the recorded portion and the unrecorded portion are respectively shown as the tape traveling in the direction of arrow a, as shown in Fig. 2, and are played back (PB) and fast forwarded (FT). There is.

Fast forwarding (F T) occurs at the leader tape L portion, and near the tape end E, the existing tape end detection signal causes the tape running to reverse in the direction indicated by the arrow.
In the fast-forward state (FT), the unrecorded portion of the second track B is advanced, and from the recorded portion thereafter, playback begins (PB).

In addition, in FIGS. 2 and 3, the temporary running operation at the transition position from fast forward running (FT) to playback running (PB) is omitted.

Note that although the case of two tracks has been described above, the same thing is possible for tapes with multiple tracks.

As described above, according to the present invention, unrecorded areas on the tape surface, such as between songs, are detected, the head performs fast forwarding in a state where it can detect the recorded signal on the chip, and playback starts at the next recorded position. This saves time and eliminates unnecessary waiting time, and in the case of an auto-reverse type, the leader tape section also runs in fast forward and playback starts from the first song on the other side. In this case, unnecessary waiting time can be reduced.

Furthermore, if the present invention is used in combination with a microcomputer, it is also possible to record the number of times between songs or recorded portions so that any song can be selected quickly.

[Brief explanation of drawings]

Figure 1 is a block diagram showing the relationship between the electric circuit and mechanism of the device of the present invention, Figure 2 is a diagram showing the relationship between the signal on the tape and the operation of the tape deck in the case of a single track, and Figure 3 is a diagram showing the relationship between the tape deck operation for multiple tracks. FIG. 3 is a diagram showing the relationship between the operations of the tape deck near the end of the tape at the time of the operation. 1...Tape, 2...Playback head, 4
...Signal detection circuit, 5...Control circuit.

Claims (1)

[Scope of utility model registration request] An auto-reverse type magnetic tape playback device detects a non-signal portion of a running tape, detects that the time of the non-signal portion has exceeded a predetermined time, and detects a signal portion of a running tape. A signal detection circuit that sends out a control signal when the end of the tape is detected; tape end detection means that sends out a signal to reverse the running direction of the tape when the end of the tape is detected; and a control signal that is generated by detecting a non-signal portion from the signal detection circuit. and a control circuit that causes the tape to run at a fast forward speed, makes the tape run at a constant speed based on a control signal detected by the signal portion, and reverses the tape running direction based on a signal from the tape end detection means, the signal detection circuit as described above. In response to the control signal, the control circuit fast-forwards the tape in the no-signal part of the tape, makes it run at a constant speed in the signal part, and when the end of the tape is reached while the tape is fast-forwarding, the running direction of the tape is reversed. A magnetic tape playback device characterized in that the tape is fast-forwarded until the first signal portion on the other side is reached.