JPH06338131A - Information-signal recording medium and reproducer - Google Patents

Abstract

PURPOSE:To obtain an information recording magnetic tape where copying of the information can be prevented, and a reproducer. CONSTITUTION:Information signals are recorded on forward tracks T1, T2 in normal recording reproduction by travelling in the backward direction, and information signals are recorded on backward tracks T3, T4 in normal recording and reproduction by travelling in the forward direction. The forward tracks T1, T2 are scanned in the backward direction and the backward tracks T3, T4 are scanned in the forward direction at the time of reproduction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information signal recording medium capable of preventing copy and a reproducing apparatus thereof.

[0002]

Despite the demand for a method of preventing copying of recording media such as music tapes, tapes for lectures and lectures, it is simple and low cost. The device has not yet been developed.

Therefore, an object of the present invention is to provide an information signal recording medium capable of preventing copying and a reproducing apparatus for using the same.

[0004]

DISCLOSURE OF THE INVENTION The present invention for achieving the above object is an information signal recording medium having a track for normally recording and reproducing an information signal by scanning in the forward direction.
The present invention relates to an information signal recording medium, wherein a special information signal is recorded on the track by reverse scanning. An apparatus for reproducing the special information signal recording medium according to claim 1 is an information signal recording medium having a track which normally scans in a forward direction to record and reproduce an information signal, and performs reverse scanning with respect to the track. A device for reproducing the special information signal by using a special information signal recording medium on which the special information signal is recorded, wherein the track of the information signal recording medium is reversely scanned when the special information signal is reproduced. It is characterized by having means. Further, as described in claim 3, it is preferable that a normal reproduction designating unit and a special reproduction designating unit are provided so that the normal reproduction and the special reproduction can be selectively performed. In the present application, the special information signal means an information signal for which it is necessary to prevent copying.

[0005]

The action and effect of the present invention: The tracks in the forward direction (for example, the first and second tracks T) of the special information signal recording medium of the present invention.
Information cannot be read even if the normal reproducing device is used to scan (1, T2). That is, since the special information signal is recorded on the track by the backward scanning, the reproduction output of the forward scanning becomes a meaningless signal. On the other hand, if a special reproducing apparatus as defined in claim 2 is used, the special information signal can be read. Therefore, the copy of the special information signal can be easily prevented. Further, according to the configuration of claim 3, it is possible to perform both special reproduction and normal reproduction with one reproducing device.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a magnetic tape and a bidirectional reproducing apparatus according to an embodiment of the present invention will be described with reference to FIGS. The magnetic tape cassette 1 used in this embodiment is a general-purpose tape cassette generally called a Phillips type, and as shown in FIG. 1, a pair of reels 3 and 4 and a recording medium are contained in a case 2. The magnetic tape 5 is housed therein. A window and a pinch roller 7 for inserting a recording / reproducing magnetic head 6 as a signal converting head are provided on the front surface of the case 2.
A window for inserting a and 7b is provided. The reel shafts 8 and 9 are engaged with the pair of reels 3 and 4, respectively.
Is driven by the first and second reel motors 10 and 11 to drive the tape 5 in the forward or reverse direction. In addition,
Capstans 12a, 12 for driving the cap 5 at low speed
A motor 13 is connected to b.

The magnetic tapes 5 are arranged side by side as shown in FIG. 2 and extend in the longitudinal direction of the tapes 5, and the first, second, third and fourth tracks T1, T2, T3, Have T4. During normal recording and reproduction, the first and second tracks T
First and second heads 6 as indicated by arrows 1 and T2
a and 6b are scanned in the forward direction, and the third and fourth tracks T
3 and T4 are scanned in the reverse direction by the third and fourth heads 6c and 6d. Therefore, the first and second tracks T1 and T2 are forward tracks, and the third and fourth tracks T3 and
T4 is a reverse track. The first and fourth tracks T1 and T4 are used as a stereo left channel, and the second and third tracks T2 and T3 are used as a stereo right channel.

FIG. 3 shows a special information signal recording table according to the present invention.
5a and the playback device. The tape 5a itself is of the same type as in FIGS. 1 and 2 and therefore has first, second, third and fourth tracks T1, T2, T3, T4. However, the recording form of the information signal for each of the tracks T1 to T4 is different. That is, the first and second tracks T1 and T2, which are forward tracks, are made to travel in the reverse direction opposite to the forward direction in the normal recording and reproduction of FIG. ) Is recorded, and the third and fourth tracks T, which are backward tracks, are recorded.
Special information signals are recorded at 3 and T4 by traveling in the forward direction. Such recording is easily accomplished by changing some of the existing tape recorders. Even if the special information signal recording tape 5a shown in FIG. 3 is scanned by an ordinary reproducing apparatus as in the case of FIG. 2, the special information signal cannot be read. Therefore, copying this is meaningless.

The special reproduction apparatus for enabling reproduction of the special information signal recording tape 5a shown in FIG. 3 includes first to fourth heads 6a to 6 corresponding to the first to fourth tracks T1 to T4.
First, second, third, fourth, fifth, sixth, seventh and eighth switches S1, S2, S3, S4 as selective connecting means between d and the left and right regenerative amplifiers 14, 15. , S5, S
6, S7, S8. First to fourth switches S1 to
S4 has an operation unit (not shown), which functions as special reproduction designating means. The first switch S1 is the first head 6
a and the second switch S2 is connected to the second head 6b.
, The third switch S3 is connected to the fourth head 6d, and the fourth switch S4 is connected to the third head 6c. Each of the fifth to sixth switches S5 to S6 has an operation section (not shown), which functions as a normal reproduction designating means. The fifth switch S5 is connected to the first head 6a, the sixth switch S6 is connected to the second head 6b, the seventh switch S7 is connected to the fourth head 6d, and the eighth switch S8. Is connected to the third head 6c.

The output terminals of the first, third, fifth and seventh switches S1, S3, S5 and S7 are connected to the first regenerative amplifier 14, and the second, fourth, sixth and eighth switches are connected. The output terminals of the switches S2, S4, S6, and S8 are connected to the second regenerative amplifier 15. The electric circuit between the heads 6a to 6d and the speakers 16 and 17 is covered with a container (not shown) so as to prevent signals from being taken out from between the heads 6a to 6d. Although the first to eighth switches S1 to S8 are shown as mechanical switches, they can of course be replaced with electronic switches such as transistors.

The first and second switches S1 and S2 are special reproduction reverse direction setting switches, are configured to interlock with each other, and are related to the motor control circuit 18. The third and fourth switches S3 and S4 are special reproduction forward direction setting switches, are configured to interlock with each other, and are related to the motor control circuit 18. The fifth and sixth switches S5 and S6 are normal reproduction forward direction setting switches, are configured to interlock with each other, and are related to the motor control circuit 18. The seventh and eighth switches S7 and S8 are normal reproduction reverse direction setting switches, are configured to interlock with each other, and are related to the motor control circuit 18.

FIG. 4 shows in principle each of the motors 10, 11, 12 of FIG. 3 and the control circuit 18 which constitute the scanning means. The control circuit 18 includes a switch Q composed of transistors for selectively driving the motors 10, 11, and 12.
1, Q2, Q3, Q4, Q5, Q6 are provided between the power supply 19 and the motors 10-12. Switches Q2, Q4, Q5
The control terminal of is connected to the power supply terminal 22 via the forward control switches 20 and 21. Therefore, when either one of the forward control switches 20 and 21 is turned on, the motor control switches Q2, Q4 and Q5 are turned on, and the motor 11 and the tape 5 or 5a are moved in the forward direction. 12 is driven. The forward control switch 20 is turned on in conjunction with the third and fourth switches S3 and S4 of FIG. 3, and the forward control switch 21 is switched to the fifth and sixth switches S of FIG.
5, it is turned on in conjunction with S6. Motor control switch Q
The control terminals of 1, Q3 and Q6 are reverse control switches 23,
It is connected to the power supply terminal 25 via 24. Therefore,
When any one of the reverse direction control switches 23 and 24 is turned on, the motor control switches Q1, Q3 and Q6 are turned on and the motor 5 or 5a runs in the reverse direction.
0 and 12 are driven. The reverse control switch 23
Turns on in conjunction with the first and second switches S1 and S2 of FIG. 3, and the reverse control switch 24 turns on in conjunction with the seventh and eighth switches S7 and S8 of FIG.

[0013]

[Operation] A special information signal recording tape 5a as shown in FIG.
To obtain a reproduction output by using, the first and second switches S1 and S2 are turned on. As a result, the switches 23, Q1, Q3, and Q6 in FIG.
a travels in the reverse direction, the special information signals of the first and second tracks T1 and T2 recorded in the reverse direction are read by the first and second heads 6a and 6b, and the reproduction amplifier 1
4 and 15 and normal output is obtained from the speakers 16 and 17. After the reproduction of the first and second tracks T1 and T2 is completed, the third and fourth switches S3 and S4 are turned on automatically or by auto-river operation. As a result, the switches 20, S2, Q4, and Q5 of FIG. 4 are turned on, the tape 5a runs in the forward direction, and the special information signals of the third and fourth tracks T3 and T4 recorded in the forward direction. Is read by the forward operation of the third and fourth heads 6c and 6d, and the speakers 16 and 1 are read through the regenerative amplifiers 14 and 15.
7 and the normal output is obtained. Even if the special information signal recording tape 5a is erroneously operated and the fifth to eighth switches are operated by mistake, the recording scanning direction and the reproducing direction of the signal in the tape 5a are different from each other, so that a normal output is obtained. Can't get

To obtain a reproduction output from the normal tape 5 shown in FIG. 2 with this apparatus, first, the fifth and sixth switches S5 and S6 are turned on. As a result, the switches 21, Q2, Q4, Q5 of FIG. 4 are turned on, the tape 5 travels in the forward direction, and the reproduction outputs of the first and second tracks T1, T2 are obtained. Next, the seventh and eighth switches S7,
When S8 is turned on, the switches 24, Q1 and Q in FIG.
3, Q6 is turned on, tape 5 runs in the reverse direction,
And the reproduction output of the fourth tracks T3 and T4.

[0015]

MODIFICATION The present invention is not limited to the above-mentioned embodiments, but the following modifications are possible. (1) As shown in FIG. 5, switches S11, S12, S13,
The same operation as in FIG. 3 can be performed by combining S14, S15 and S16. In FIG. 5, switches S11, S12,
The contact F of S13 and S14 is turned on when traveling in the forward direction, and the contact R is turned on when traveling in the reverse direction.
The contact a of the switches S15 and S16 is turned on during special reproduction, and the contact b is turned on during normal reproduction. The control circuit 18a sets the forward running and the backward running of the tapes 5 and 5a by the combination logic of the on / off operations of the switches S11 to S16. (2) When stereo recording is not performed, the same signal is recorded on the first and second tracks T1 and T2, and the third and fourth tracks are recorded.
The same signal is recorded on the tracks T3, T4 of the same, or only the first and fourth tracks T1, T4 are used, or only the second and third tracks T2, T3 are used, or the first Only track T1 can be used. (3) In the special information signal recording tape 5a, the first half signal is recorded on the third and fourth tracks T3 and T4, and the latter half signal is recorded and reproduced on the first and second tracks T1 and T2. It can sometimes be modified to play the third and fourth tracks T3, T4 first and the first and second tracks T1, T2 later. (4) In order to reliably achieve copy prevention, noise may be mixed into the special information signal for recording, and noise may be removed during reproduction and sent to the speakers 16 and 17. At this time, a mixed signal of a signal and noise is recorded on the first and fourth tracks T1 and T4, and the same phase inversion as the first and fourth tracks T1 and T4 is performed on the second and third tracks T2 and T3. Noise is recorded, and noise on the second and third tracks T2, T3 is recorded on the first and fourth tracks T1,
It can be used to remove noise from the playback output of T4.

[Brief description of drawings]

FIG. 1 is a plan view showing a tape cassette and its drive system.

FIG. 2 is a diagram showing normal signal recording for a tape.

FIG. 3 is a diagram showing a special information signal tape and a reproducing device according to an embodiment of the present invention.

FIG. 4 is a circuit diagram showing a motor control circuit and a motor shown in FIG.

FIG. 5 is a diagram showing a reproducing apparatus of a modified example.

[Explanation of symbols]

 5a Magnetic tape 6a to 6d Head S1 to S8 switch 14, 15 Regenerative amplifier

Claims (3)

[Claims] 1. An information signal recording medium having a track which is normally scanned in the positive direction to record and reproduce an information signal, wherein a special information signal is recorded in the reverse direction on the track. Information signal recording medium. 2. A special information signal recording in which a special information signal is recorded on the track by reverse scanning in an information signal recording medium which normally has a track for recording and reproducing an information signal by scanning in the forward direction. A reproducing apparatus for reproducing the special information signal by using a medium, comprising a means for scanning the track of the information signal recording medium in a reverse direction when reproducing the special information signal. . 3. A normal information signal recording tape in which the normal information signal is recorded by the forward scan on a track for normally recording and reproducing the normal information signal by scanning in the normal direction. A special information signal recording tape in which a special information signal is recorded in a reverse scan on a track for reproducing and reproducing the normal information signal and usually for recording and reproducing the information signal by scanning in the forward direction is used. A device for reproducing the information signal, a normal reproduction designating unit for designating normal reproduction of the normal information signal, and a special reproduction designating unit for designating reverse reproduction of the special information signal, In response to the designation of the normal reproduction of the normal information signal by the normal reproduction designating means, the signal conversion head of the track is connected to the reproduction amplifier, and the special reproduction designating means performs the reverse reproduction of the special information signal. Selective connecting means for connecting the signal conversion head of the track to the reproduction amplifier in response to the designation, and the normal information signal recording medium in response to the designation of the normal reproduction of the normal information signal by the normal reproduction designating means. Of the track of the special information signal recording medium is scanned in the forward direction by the head, and the track of the special information signal recording medium is moved to the normal information signal recording medium in response to the specification of the reverse reproduction of the special information signal by the special reproduction designating means. A reproducing apparatus comprising means for performing reverse scanning opposite to forward scanning.