JPH0634310B2 - Magnetic recording / reproducing device - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention provides that the recorded signal is error-free with respect to the signal source.
The present invention relates to a magnetic recording / reproducing device with high information reliability.

Configuration of Conventional Example and Problems Thereof A conventional cassette type tape recorder used as a data recorder will be described with reference to FIGS. 1 and 2, 1 is a cassette,
2 is a supply reel, 3 is a take-up reel, 4 is a chassis, 5 is a magnetic tape, 6 and 7 are guide bosts, 8 is a magnetic head,
9 is a pinch roller, 9a is a capstan, 10 is a cassette tape recorder, 11 and 14 are codes, 12 is a personal computer, and 13 is a display. The cassette tape recorder 10 is connected to a personal computer 12 by a cord 11, and the personal computer 12 and the display 13 are connected by a cord 14. Inside the cassette 1, there are a supply reel 2, a take-up reel 3, and guide posts 6 and 7. The magnetic tape 5 comes out of the supply reel 2, contacts the magnetic head 8 via a guide post 6, and then It reaches the guide post 7 through the space between the pinch roller 9 and the capstan 9a, and is wound up on the winding reel 3. FIG. 3 is an explanatory view of a pattern of the magnetic tape 5, that is, the data tape recorded by the cassette type tape recorder 10, and an arrow A indicates a traveling direction of the magnetic tape 5 during recording. . 16 is a portion in which data indicating the start, which is called a header, is recorded, 17 is a portion in which a file name is recorded, 18 is a portion in which data such as a program is recorded, 19 is a portion in which data indicating the end is recorded Is.

In the above conventional configuration, if a problem occurs in the cassette tape recorder 10 or the magnetic tape 5 during recording (for example, the magnetic head 8 becomes dirty or dust adheres to the magnetic tape 5), it is detected during recording. However, after recording all the necessary data groups, rewinding and reproducing, and checking the error.
This was very troublesome, taking time and effort.

An object of the present invention is to solve the above-mentioned conventional drawbacks, and an object of the present invention is to provide a magnetic recording / reproducing apparatus capable of monitoring and checking recorded information with a simple structure.

To achieve the above object, the magnetic recording / reproducing apparatus of the present invention is a magnetic recording / reproducing apparatus equipped with a magnetic head and provided with a rotary head drum around which a magnetic tape is wound at a predetermined angle during recording / reproducing. Recording means for recording substantially the same signals on a plurality of tracks on the magnetic tape, reproducing means for reproducing a plurality of signals recorded on the plurality of tracks, and a plurality of reproducing means for reproducing the plurality of signals. The recording means includes a comparing means for mutually comparing the reproduced signals, a complementing means for mutually complementing the reproduced signals by the output of the comparing means, and an output means for outputting the signals complemented by the interpolating means. When recording a signal on a predetermined track of the magnetic tape, the signal immediately after recording is reproduced by the reproducing means and is obtained by the signal and the signal to be recorded. The signal thus obtained is compared and the comparison result is recorded at a predetermined position on the magnetic tape.

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 / reproducing apparatus. 21 is a chassis, 22 is a cassette, 23 is a supply reel, 24 is a take-up reel,
25 is a magnetic tape, 26 to 28 are guide posts, 29 is a tension pole, 30 is an erase head, 31 is an impedance roller, 32 and 33 are guide posts, 34 is a rotary head drum,
The arrow B indicates the rotation direction of the rotary head drum 34, 35 and 36 are guide posts, 38 is an impedance roller, 39 is an A / C head, 40 is a guide post, 41 is a pinch roller, and 42 is a capstan. Magnetic tape 25 wound around supply reel 23
Goes out of the cassette 22 via the guide posts 27 and 28,
The tension pole 29, the erase head 30, the impedance roller 31, the guide post, and the guide posts 32 and 33 are wound around the rotary head drum 34, and the guide posts 35 and 36, the impedance roller 38, the A / C head 39, the guide post 40, and the cap. It enters into the cassette 22 through the stun 42 and the pinch roller 41, and passes through the guide post 26 in the cassette 22 and the take-up reel 24.
To be wound up. The one-dot chain point C is the locus from the position when the guide posts 32, 33 are in the cassette opening to the predetermined winding position, and the one-dot chain point D is also the locus of the guide posts 35, 36.

FIG. 5 is an explanatory view of a mounting state of the magnetic head on the rotary head drum 34, where 43 is a first head and 44 is a second head.

FIG. 6 is an explanatory view of the tape pattern recorded on the magnetic tape 25, viewed from the magnetic surface side of the tape. The arrow E indicates the traveling direction of the magnetic tape 25, and the arrow F indicates the traveling direction of the magnetic heads 43 and 44 of the rotary head drum 34. Tracks 50 to 53 show a part of the recorded recording signal pattern, and 50a to 53a are the parts where the end marks of the tracks 50 to 53 are recorded.

FIG. 7 is a circuit block diagram showing a part of the circuit system related to the first and second heads 43 and 44. The second head 44 is connected to the reproducing circuit 61, and the reproduced signal thereof is compared with the comparing circuit. 62 allows comparison with the original data from the original data storage circuit 63. The recording circuit 64 connected to the first head 43 is for recording the signal from the comparison circuit 62 or the original data from the original data storage circuit 63, and the switching of the signal is performed by the contact 62a of the switch 65 which contacts. , 63a is selected.

FIG. 8 is a circuit block diagram of a main part of a circuit system connected to the first head 43 during reproduction. Reference numeral 70 is a reproduction circuit, 71 is a delay circuit, and 72 is a comparison circuit. Reference numeral 73 denotes a switch that is switched in synchronization with the rotation of the rotary head drum 34, and the signal passes from the first head 43 to the reproduction circuit 70, and is compared by the switch 73 to the delay circuit 71 at some times and directly at other times. Circuit 72
Enter Reference numeral 74 denotes a switch operated by the output from the comparison circuit 72. The switch 74 can select the signal from the reproduction circuit 70 or the signal from the delay circuit 71 as the final output.

Next, the operation will be described. As shown in FIG. 4, the magnetic tape 25 is pulled out from the cassette 22 and recorded / reproduced in a state where it is wound around the rotary head drum 34. First, at the time of recording, for example, when the track 50 is drawn, recording is performed from the lower right part of FIG. 6 by the first head 43. At this time, the second head 44
Is very close to the first head 43,
The track 60 drawn by 43 is traced so as to follow the first head 43, and the signal drawn by the first head 43 is reproduced. Then, the reproduction signal is amplified by the reproduction circuit 61 and sent to the comparison circuit 62.
The comparison circuit 62 constantly compares the recording signal from the first head 43 reproduced by the second head 44 with the original data from the original data recording circuit 63. When the trace of the first head 43 goes further and enters the end mark area 50a, the second head 44 also reaches the end mark area 50a long before the first head 43 comes out of contact with the magnetic tape 25. enter. When there is a clear difference between the first head 43 and the second head 44 in the area of the end mark 50a as compared with the original data as a result of the comparison by the above-mentioned comparison circuit 62, The head 43 records a certain signal indicating that the signal of the track 50 is defective in the end mark area 50a according to an instruction from the comparison circuit 62. In this way, when it is found by the monitor of the second head 44 that the recording of the track 50 is not successful due to the dirt of the magnetic tape 25, the unevenness of the magnetic material on the magnetic tape 25, etc. It will be re-recorded again at 51. Incidentally, in order to correct an error at the time of reproduction which will be described later, recording is performed by recording the same data on one track and a track adjacent to the same, apart from the repeated recording by the monitor at the time of recording. That is, for example, the sixth
In the figure, data a is recorded on tracks 50 and 51, and the next data b is recorded on tracks 52 and 53.

Next, at the time of reproduction, the first head 43 first tracks
Play 50 signals. At that time, if the end mark area 50
If a signal indicating that the signal of the track 50 is defective is recorded in a, the signal of the track 50 is not output from the reproducing circuit 70, and the signal of the track 50 is skipped and the process goes to the next track. Fortunately, if no signal indicating that the signal of the track 5 is defective is recorded in the end mark area 50a of the track 50, the signal of the track 50 is sent from the reproducing circuit 70 to the delay circuit 71. At this time, switch 73
Is in contact with the contact 71a. And then the first
The head 43 reproduces the signal of the next track 51. At this time, the switch 73 is switched and comes into contact with the contact 72a. And the first
The signal of the track 51 taken in from the head 43 is sent to the comparison circuit 72 after it is confirmed that the end mark area 51a of the track 51 does not contain a signal indicating a defect. In the comparison circuit 72, the reproduction signal of the track 50 and the reproduction signal of the track 51 sent from the delay circuit 71 are compared with each other in phase, and the higher level carrier wave included in the reproduction signal is selected. Switch 74 to operate. In this way, during reproduction, the signals of the two tracks are compared, and the one with the higher carrier output level is always selected to perform error correction during reproduction.

In this way, the data recorded by the first head 43 is monitored by the second head 44, and if there is an error, a signal indicating that the track has an error is recorded, and the next track is recorded again. Since the data is recorded in the recording medium, even if an error occurs during recording, it can be ignored during reproduction, and a highly reliable data recorder can be obtained. Further, even in a so-called home VTR, it is considered that this configuration can be easily adopted with a slight modification, which is highly practical.

EFFECTS OF THE INVENTION As described above, according to the present invention, it is possible to monitor and check recorded information with a simple configuration, and it is possible to greatly improve the reliability of information.

[Brief description of drawings]

FIG. 1 is a schematic plan view of a conventional magnetic recording / reproducing apparatus, FIG. 2 is an overall configuration diagram of an information system using the conventional magnetic recording / reproducing apparatus, and FIG. 3 is a magnetic tape recorded by the conventional magnetic recording / reproducing apparatus. 4 is a schematic plan view of a magnetic recording / reproducing apparatus according to an embodiment of the present invention, FIG. 5 is an explanatory view of a head mounting state of a rotary head drum, and FIG. 6 is recording on a magnetic tape. FIG. 7 is an explanatory diagram of a format, FIG. 7 is a circuit block diagram of an essential part of a recording system circuit, and FIG. 8 is a circuit block diagram of an essential part of a reproduction system circuit. 25 ... magnetic tape, 34 ... rotating head drum, 43 ... first head, 44 ... second head, 62 ... comparison circuit

Claims (1)

[Claims] 1. A magnetic recording / reproducing apparatus equipped with a magnetic head and comprising a rotary head drum on which a magnetic tape is wound at a predetermined angle at the time of recording / reproducing, which is substantially the same on a plurality of tracks on the magnetic tape. Recording means for recording the signals, reproduction means for reproducing a plurality of signals recorded on the plurality of tracks, comparing means for mutually comparing a plurality of reproduction signals reproduced by the reproducing means, and the comparing means. Output means for complementing the reproduced signal with each other and output means for outputting the signal complemented by the complementing means, and the recording means records the signal on a predetermined track of the magnetic tape. At this time, the signal immediately after recording is reproduced by the reproducing means and the signal to be recorded is compared with the signal obtained by the reproduction, and the comparison result is the magnetic tape. Configuration and the magnetic recording and reproducing apparatus for recording a predetermined position.