JPS60671A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To prevent the generation of an error at reproduction with a simple constitution by recording a signal on plural tracks, comparing signals reproduced from the said tracks at reproduction, and selecting a signal having a higher signal level of a carrier wave of a reproduced signal. CONSTITUTION:Same data are recorded on two adjacent tracks. A head reproduces a signal of a track 50 at first at reproduction. When the signal of the track 50 is not in error in this case, the signal is fed to a delay circuit 71 from a reproducing circuit 70. In this case, a switch 73 is turned to the position of a contact 71a. Then the head reproduces a signal on the track 51. The switch 73 is changedover and turned to the position of a contact 72a, in this case. When the signal on the track 51 is not in error, the signal is fed to a comparator circuit 72. The comparator circuit 72 compares the reproducing signal of the track 50 from the delay circuit 71 with the reproducing signal of the track 51, and activates the switch 74 to select a signal in higher carrier level. Thus, the higher output level is selected at all times in this way therby attaining error correction at reproduction.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a magnetic recording and reproducing apparatus with high reliability of information, in which recorded information has no error with respect to the source.

The structure of a conventional example and its problems A conventional cassette type tape recorder used as a data recorder will be explained with reference to FIGS. 1 to 3. In Figure 1 and Figure 2, 1 is a cassette;
2 is the supply reel, 3 is the L YG take-up reel, and 4 is the sea 1
1 sea, 5 magnetic tape, 6.7 guide post, 8 magnetic head, 9 bib 11-ra, 9a capstan, 10 cassette type)'-precoder, 11.14 code, 12 Parts Nor computer, 13 is a display. The cassette tape recorder 10 is
A cord 11 is connected to a personal computer 12, and a cord 14 connects the parts-full computer 12 and a display 13. Inside the cassette 1, there are a supply reel 2, a take-up reel 3, and a guide boss 6.7. 8, then passes between the pinch roller 9 and the 1-yapstan 9a, reaches the guide post 7, and is taken up on the take-up reel 3. FIG. This is an explanatory diagram of the pattern of the +4&K tape 51j', that is, the data tape, and the arrows indicate the 1 (fjh direction) when recording on the magnetic tape 5.
17 is the part where the file name is recorded, 18 is the part where data such as programs is recorded, and 19 is the part where data indicating the end is recorded. It is a part.

In the above-mentioned conventional 4:1S configuration, if a trouble occurs in the cullet type chip holder 10 or the magnetic tape 5 during recording (for example, the magnetic head 8 gets dirty or the magnetic chip 15 gets dirty, etc.) , there is a method of recording all the necessary data groups C, rewinding and replaying them, and checking for errors without being able to find them during recording. It takes time and effort, and is extremely inconvenient.

OBJECTS OF THE INVENTION The present invention solves the above-mentioned conventional drawbacks, and an object of the present invention is to provide a magnetic recording/reproducing device which has a simple configuration and does not cause errors in reproduction.

Structure of the Invention In order to achieve the above L1 goal, the magnetic recording/reproducing device of the present invention is equipped with a magnetic head and rotates a magnetic head at a predetermined angle I (J 1J) during recording and reproduction. 146, when recording, record zubesa No. 111 is recorded on multiple racks, and when playing back, 1; L, jfjl
Pi! The signal reproduced from a plurality of tracks is compared, and the IJ with the highest signal level of the carrier wave of the raw signal is selected and output.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 4 is a schematic plan view of the magnetic recording and reproducing apparatus, in which 21 is a chassis, 122 is a cassette, 23 is a supply reel, 24 is a take-up reel, 25 is a magnetic tape, 26 and 28 are guard posts, 29 is a tension Ball, 30 is the erase head, 31 is the impedance 1]-ra, 32.33jJ guide post, 34 is the rotating head drum, arrow 13 is the rotation direction of the rotating head drum 34, 35.3G is the guide post, 38 is the impedance roller, 39 is △/C head,
40 is a guide boss, 41 is a pinch roller, 421J.

, t-V Pustan. M wound on the supply reel 23
&The tape 25 is used to attach the guide posts 27 and 28.
J l = Chive - Go outside of 22, tension ball 29
, the erase head 30, the impedance roller 31, and the rotating head drum 34 through the guide post 32 and 33.
wrapped around, guide boss 35.3G, impedance roller 3B.

△/C head 39, guide boss 40, capstan 4
2 and pinch rollers 41, enters the cassette 1-22, passes through the guide post 2G in the cullet 22, and is wound onto the take-up reel 24. The chain point C is the guide boss h32.
33 is the locus from the position of the opening in the fourth part to the predetermined winding position, and the dot-and-chain dots are also the loci of the guide posts 35 and 36.

FIG. 5 is an explanatory diagram of how the magnetic heads are attached to the rotary head drum 34, where 43 is a first head and 44 is a second head.

E (Figure 56) is an explanatory diagram of the tape pattern recorded on the magnetic tape 25, viewed from the magnetic surface side of the i-wave. Arrows Et and L indicate the direction in which the magnetic head 7-b 25 moves, and arrow F indicates the direction in which the magnetic heads 43 and 44 of the rotary head drum 34 move. :lO~53 is 1~lack and shows a part of the recorded recording signal pattern, and 50
a ~53a 1. t respectively of tracks 50 to 53,
”, this is the part where the end mark is recorded.

FIG. 7 is a circuit block diagram C showing a part of the circuit system related to the first and second heads 43 and 44;
tiL is connected to the regeneration circuit 61, and the reproduced signal of
You can compare the original data from 3. 1st
The recording circuit 64 connected to the head 43 of
Signal from 2 or A-riginol data record 1^ circuit 63
is for recording original data from
The signal is switched by the contact 62a of the switch 65,
This is done by selecting 63a.

FIG. 8 is a circuit block diagram of the main parts of the circuit system connected to the first head 43 during reproduction, in which 10 is a reproduction circuit, 71 is a delay circuit, and 12 is a comparator vR. The signal is transmitted from the first head 43 through the reproducing circuit 70 and then to the switch 13 (and sometimes a delay circuit). to 71,
At other times, the signal directly enters the comparator FF172.

74 is a switch activated by the output from the comparator circuit 72, and this switch 74 converts the signal from the reproducing circuit 70 or the signal from the delay circuit Fτ171 to 11.
The selection can be overridden as the final output.

Next, the operation will be explained. As shown in FIG. 4, the magnetic tape 125 is pulled out from the cassette 22 and wound around the rotary head drum 34 in a V shape to record and reproduce signals.

First, when recording, for example, when drawing the h rack 50, the first head 43 records from the lower right Qi of FIG. They are very close to each other. The reproduced signal is then inputted to the Q output circuit 61, J is amplified, and the comparator circuit 62
sent to. In the comparison circuit 62, the recording No. 13 recorded in the first head 43 reproduced by the second head 44 and A from the original data recording circuit 63
I am constantly comparing it with the original arta. The trace of the first head 43 is further rubbed, and the end mark area 5
When entering 0a, the first head 43 enters the -1-nd 7-ri region 5()a in a state in which it is not in contact with the magnetic chip 125 (the second spatula 1-441). When the No. 1 head 43 and the No. 2 head 44 are in the area of the No. 1 mark 50a, as a result of the comparison of the above comparison circuit 62 (.), if a clear %i exists in 1n with the original data, 1-hook in the end mark area 50a according to instructions from the first head +13 LJ,, comparison circuit 62h) and others!
We acknowledge that the IO signal was defective and record 4ri lj. This J: sea urchin, ]-track o recording may be caused by, for example, dirt on the magnetic tape 25 or magnetic tape 2! i,
, l of! If the monitor of the first head 44 indicates that the recording did not go well due to unevenness in the 171 body, etc., recording is performed again on the 1-rack 51.

In addition, in order to correct errors during playback, which will be described later, the same data should be displayed on the monitor during recording, and the same data may be displayed next to the same i-rack. 1-
record on the rack. For example, in Figure 6,
Data a is a track! Then, the next data b is recorded on tracks 52 and 53.

Next, during reproduction, the first head 43 first regenerates the signal of the track 50. If the signal of this track 5o is defective (8B is recorded in the end mark area 50a), then the output signal (iJq of the other track 50 is output from the raw circuit lO) This one
Skip the signal of rack 50 and go to the first track. Fortunately, the end mark area of I-Rack 5o! i (l
This 1-rack on a! A signal indicating that the IO signal is defective is recorded (if it is negative, the transmission 5 of this track 5o) is sent from the reproduction time i'1170 to the iY extension time f871.At this time, the switch 13 is connected to the contact point 71a. The first head 43 is in contact with the next σ.
Regenerate the signal of moon rack 51. , at this time switch 7
3 is cut and comes into contact with the contact point 72i1. The signal of the track 51 brought back from the first head 43 after the 1-
rack! After confirming that 11a is defective (fin is not included), it is sent to the comparator circuit 12. In the comparator circuit 72, τ is 1lJ
The reproduction signal of the track 50 sent from the i extension circuit 71 and the reproduction (r+53) of the track 51 are combined with the iQ phase 1:
) 1! T Jt comparison L, 1tJit, (operate switch γ4 to select the higher level carrier wave included in the ri number. This J is very interesting, and during playback, it compares the signals of 2 wood σ moon and rack. , the one with the higher output level of the carrier wave is always selected, and the Nilla correction is performed for l-rack.For example, in order to finally obtain the signal of l-rack, , the first 1/3 track is ) - rack 5o 1. Using g, the next 1/3 track is 1-
It is also possible to use the signal of rack 51 and use the 1/31-rack of track 5o for the 1/31-rack of eyebrow 1η.

In this way, the magnetic head 43 of the rotating head drum 34,
44, the same data is recorded in multiple 1~racks,
During playback, always select the one with the higher output level of the carrier wave included in the (j; number) by comparing the playback partners (shi) from these multiple tracks. of-
Even if there is a signal dropout such as a 7-block head due to dirt or the like, it is possible to convert it to rj and iE, and a highly reliable data rate 4 can be obtained. Furthermore, in the so-called home stable Vl+≧-, it is thought that it is possible to easily achieve this (1.1 ratio) with a small change, and it is highly practical.

According to the invention, according to the invention, it is simple l)I 1.
Although it is a 71-bit structure, there is no occurrence of 1 error during playback, greatly improving the reliability of information.

[Brief explanation of the drawing]

Figure 1 (: 1. subordinate) 1ξ (Kiki lit 'i'
Figure 2 is a schematic plan view of the 1111 information system using a conventional recording and reproducing device.
The figure shows two recordings on a conventional IL&L energy playback device:
ti1m ki tape pattern 1ii1! Mingzu, No. 4
The figure is a schematic plan view of a magnetic recording ILT production device according to an embodiment of the present invention, FIG. An explanatory diagram of the recording format 1, FIG. 7 is a circuit block diagram of the main part of the recording system circuit, and FIG. 8 is a circuit block diagram of the main part of the recording system circuit. 25...I magnetic tape, 34...Rotating head drum, 43°44...Magnetic head, 10...Reproducing circuit,
11...Delay circuit, 72...Comparison device y7S, 73.
74...Switch Figure 5 fo 51 Gu2 Love Figure 7 Figure 1

Claims (1)

[Claims] 1. Equipped with a rotating head drum equipped with a magnetic head and around which magnetic tape is wound at a predetermined angle during recording and playback.
At the time of recording, the signals to be recorded are recorded on a plurality of tracks, and at the time of reproduction, the signals reproduced from the plurality of tracks 1 to 1 are compared, and the one having a higher signal level of the carrier wave of these reproduced signals is selected and output. What happened to the magnetic recording/reproducing device?