JPH0636209A - Tape recording and replay apparatus - Google Patents

Abstract

(57) [Summary] [Object] An object of the present invention is to provide a tape recording / reproducing apparatus capable of reproducing even data recorded on a tape along its running direction, even though it is a helical scan method. [Structure] A tape 12 having a plurality of linear tracks on which data is recorded along a running direction is reproduced by a helical scan method using a rotary head, and data of the linear tracks read by being divided by the rotary head. Are recorded, reconstructed in the order corresponding to the original linear track, and reproduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tape recording / reproducing apparatus using a helical scan system such as DAT (Digital Audio Tape Recorder), and more particularly to data recorded on a tape along its running direction. Also about what you got to be able to play.

[0002]

2. Description of the Related Art As is well known, a tape recording / reproducing apparatus for digitizing an information signal, recording it on a magnetic tape or the like, and reproducing it to obtain an original information signal has been actively developed. As a tape recording / reproducing apparatus of this type, a DAT that digitizes an audio signal and records / reproduces on / from a magnetic tape by a helical scan method has already been commercialized and is in the mainstream, but now it is digitized. A DCC method has also been proposed in which audio data is recorded and reproduced along a running direction of a magnetic tape by a fixed head.

Since DAT digitally records audio data in a non-compressed manner, it has the advantage that recording and reproduction with high fidelity to the original signal can be realized.
Since it uses a new standard tape cassette, it has the inconvenience that it is not compatible with other current formats.
Since CC can use the existing compact tape cassette, it is expected to be widely used for general consumers, but it compresses digital audio data to about 1/4 and records it, so it has a fidelity to the original signal. It has a disadvantage that it is deteriorated more than DAT.

By the way, a tape on which data is recorded by the helical scan system cannot be reproduced unless a tape recording / reproducing apparatus of the same system is used, and a tape on which data is recorded by the DCC system is also of the DCC system. It is usually possible to reproduce without using a tape recording / reproducing apparatus, and there is no compatibility between the helical scan type tape recording / reproducing apparatus and the DCC type tape recording / reproducing apparatus. Is the current situation.

[0005]

As described above, in the past, the helical scan type tape recording / reproducing apparatus and the DC were conventionally used.
No consideration is given to compatibility with the C type tape recording / reproducing apparatus.

Therefore, the present invention has been made in consideration of the above circumstances, and is a very good tape recording / reproducing apparatus capable of reproducing the data recorded on the tape along its running direction, even though it is a helical scan system. The purpose is to provide.

[0007]

A tape recording / reproducing apparatus according to the present invention reproduces a tape having a plurality of linear tracks on which data is recorded along a traveling direction by a helical scan method using a rotary head. Then, the data of the linear track read by being divided by the rotary head is recorded, reconstructed and reproduced in the order corresponding to the original linear track.

[0008]

According to the above construction, the linear track formed on the tape is reproduced by the rotary head by the helical scan method, the data of the read linear track is recorded, and the data is recorded in the order corresponding to the original linear track. Since the data is reconstructed and reproduced, it is possible to reproduce the data recorded on the tape along the traveling direction, even though it is the helical scan method.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings. FIG. 4 shows the outline of the helical scan type tape recording / reproducing apparatus described in this embodiment. That is, the tape 12 pulled out from the tape cassette 11 is supported by the plurality of guide groups 13 and 14, and the rotary drum 15 on which a rotary head (not shown) is mounted.
As shown in FIG. 5, the peripheral side surface of the disk is obliquely contacted for recording / reproduction by the helical scan method, and is sandwiched between the capstan 16 and the pinch roller 17 to control the traveling speed. In FIG. 5, arrow A indicates the rotation direction of the rotary drum 15, and arrow B indicates the running direction of the tape 12.

Here, in FIG. 1, three tracks (hereinafter referred to as linear tracks) a, b, and c in which data are respectively recorded are formed along the running direction by a tape recording / reproducing apparatus of the DCC system, for example. Tape 12 shown in FIG.
It shows a state of reproduction by the tape recording / reproducing apparatus of the helical scan system shown in FIG. The rotary head sequentially scans the tape 12 to the left in the helical scan direction indicated by arrow C in FIG.

In this case, the locus (hereinafter referred to as a helical track) HT traced by the rotary head on the tape 12 by one scanning is very narrow in width as compared with the widths of the linear tracks a, b, c. The angle with respect to the data recording direction on the linear tracks a, b, and c indicated by arrow D in FIG. 1, that is, the track angle is usually set to several degrees (for example, about 6 °).

For this reason, the rotary head can read each linear track a, b, c on the tape 12 several times at one place by helically scanning the tape 12 although it is fragmentary. . That is, the portion of the linear track a sandwiched by the two dotted lines in FIG. 1 has three parts on the rotary head, as shown by hatching in FIG.
It can be seen that the scanning is performed twice, that is, the scanning is repeated three times.

As described above, when the tape 12 is helically scanned and reproduced, the data recorded on the linear tracks a, b, and c are sequentially and fragmentally read sequentially from the rotary head. Therefore, after the data of the linear tracks a, b, and c read in pieces are recorded on a recording medium such as a semiconductor memory (not shown), the data are distributed to the linear tracks a, b, and c, and overlapped. Then, the read data is deleted, the time difference between the linear tracks a, b, and c is corrected, and the linear tracks a,
By reorganizing the data into the same format as the data recorded in b and c, the data of each linear track a, b and c recorded in the tape 12 along its running direction is also reproduced while using the helical scan method. You will be able to.

In this case, the data read redundantly is
It can be used as correction data when a reading error due to dropout or the like occurs. Further, it is not necessary to store all the read data in the recording medium, and the capacity of the recording medium can be reduced by, for example, thinning out every several rotations.

Further, the rotational speed of the rotary drum 15 may be lowered. FIG. 2 shows linear tracks a, b and c.
The trace locus of the rotary head is shown when the helical scan is performed at the minimum number of rotations required to read with a complete envelope output. The rotary head is shown in Figure 2.
The tape 12 is sequentially scanned leftward in the helical scan direction indicated by arrow C. In this case, taking the linear track a as an example, the data recorded on the linear track a is reproduced without exhaustion by extracting and connecting the portion shown by hatching in the drawing among the data read by the helical scan. be able to. In the case of FIG. 2, data of the same portion will not be read redundantly, except for reproduction data at incomplete output at both ends of the hatched portion in the drawing.

When performing the reproduction by the helical scan, as in the VHS system VTR (video tape recorder), the rotary drum 15 is equipped with the rotary heads of two channels having different azimuth angles, and the two rotary heads alternate. When the azimuth recording method of tracing the tape 12 is adopted, if the azimuth angle of one channel is made to coincide with the azimuth angle (normally 0 °) of the linear tracks a, b and c, the azimuth angle is set. The rotary head with the same angle can be used as the reproducing head for both the helical track and the linear track, but a rotary head dedicated to reproducing the linear track may be separately provided.

When a linear track is formed on the tape 12 in a format in which data is reciprocally recorded, the tape cassette 11 may be manually turned upside down, but the tape cassette 11 should not be turned upside down. If the assumption is made, it is necessary to design the helical scan system so as to be capable of reciprocating. In that case, the tape 1 by the helical scan method is reversed by reversing the running direction of the tape 12 and the rotating direction of the rotary head between the forward running and the backward running.
The second trace is also carried out on each side of the tape 12 divided into two in the width direction.

FIG. 3 shows a tape 1 on which data is reciprocally recorded.
2 shows the pattern. In FIG. 3, data is recorded in the forward direction indicated by the arrow D1 on the linear tracks a1, b1, c1 and data is recorded in the reverse direction indicated by the arrow D2 on the linear tracks a2, b2, c2. Then, the rotary head sequentially scans the tape 12 leftward in the helical scan direction shown by the arrow C1 in FIG. 3 during the forward reproduction, and in the backward scan, the tape 12 in the helical scan direction shown by the arrow C2 in FIG. By sequentially scanning in the right direction, both linear tracks a1, b1, c1 and a2, b
2, c2 can be reproduced.

Here, in each of the above-described embodiments, the data recording direction of the linear track and the reproduction direction by the helical scan are the same direction, but for example, the helical scan is performed so that they are in the opposite relationship. Even in such a case, the linear track can be reproduced by recording the read data on the recording medium and then performing signal processing such that the read data is rearranged so as to be restored.

Further, for example, in the case of reproducing a tape in which main data is recorded on a helical track and audio signals and control signals are recorded on a linear track by a fixed head, the helical scan reproduction of the helical track by a rotary head. In addition, if the linear track is also read and reconstructed in pieces by the rotary head, the fixed head for reproducing the linear track can be omitted on the reproducing side. The present invention is not limited to the above-described embodiments, but can be variously modified and implemented without departing from the scope of the invention.

[0021]

As described above in detail, according to the present invention,
It is possible to provide a very good tape recording / reproducing apparatus capable of reproducing the data recorded on the tape along the traveling direction even though it is the helical scan method.

[Brief description of drawings]

FIG. 1 is a diagram shown for explaining an embodiment of a tape recording / reproducing apparatus according to the present invention.

FIG. 2 is a view for explaining another embodiment of the present invention.

FIG. 3 is a diagram for explaining still another embodiment of the present invention.

FIG. 4 is a configuration diagram showing an outline of a helical scan type tape recording / reproducing apparatus.

FIG. 5 is an enlarged view showing a rotary drum portion of the apparatus.

[Explanation of symbols]

11 ... Tape cassette, 12 ... Tape, 13, 14 ... Guide group, 15 ... Rotating drum, 16 ... Capstan, 17
… Pinch rollers.

Claims (1)

[Claims] 1. A helical scan type tape recording / reproducing apparatus using a rotary head, a reproducing means for reproducing a tape having a linear track on which data is recorded along a traveling direction, and the rotating means by the reproducing means. A recording means for recording the data of the linear track divided and read by the head; and an editing means for reconstructing the data recorded in the recording means in the order corresponding to the original linear track. A tape recording and reproducing device characterized by.