JPH03288365A - Data recording and reproducing device - Google Patents

Abstract

PURPOSE:To improve the reliability of data by respectively recording the same data to plural tracks and reproducing the data while adding them from the respective tracks. CONSTITUTION:Magnetic heads 2L and 2R are provided parallelly in the breadthwise direction of a magnetic tape 1, and respectively record the same write signal while setting tracks TRL and TRR on the tape 1. Recording data TXD is recorded to recording areas L2 and R2 and synchronizing signals are recorded to recording areas L1, L3, R1 and R3. When reproducing the data, the tape 1 is reproduced by the magnetic heads 2 while connecting terminals 3a and 3c of a switcher 3 by a control part 8. The heads 2L and 2R respectively reproduce the tracks TRL and TRR. Next, the outputs of the respective heads are added and successively transmitted through a differentiation circuit 12 to a converter 13, demodulation circuit 7, control part 8 and other facsimile equipment. Thus, since the data are recorded and reproduced in the plural tracks, the data are reproduced without being missed when one track is normal at least even in the case of making the recording state of data defective or destroying the tracks.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a data recording/reproducing device capable of recording and reproducing digital data.

Conventional technology Conventionally, in magnetic recording and reproducing devices that record and reproduce digital data on magnetic tape, dust and the like adhere to the surface of the magnetic tape during recording and reproduction of the magnetic tape, as well as damage caused by repeated reproduction operations and aging. Data dropouts, which can be fatal to magnetic recording and reproducing devices due to deterioration of the characteristics of the magnetic material of the magnetic tape or destruction of the magnetic material due to changes in the magnetic material, can be prevented by error correction. It was playing.

Problems to be Solved by the Invention The above-mentioned magnetic recording and reproducing apparatus has the problem of increased costs both in terms of hardware and software.

SUMMARY OF THE INVENTION An object of the present invention is to provide a data recording and reproducing apparatus that can solve the above technical problems, prevent the effects of data dropout during reproduction of a recording medium, and improve the reliability of reproduced data.

Means for Solving the Problems The present invention includes a recording means for recording data on a plurality of tracks of a recording medium, and a reproduction means for reproducing data from the recording medium. A data recording and reproducing apparatus is characterized in that data is recorded on a plurality of tracks, and when data is reproduced, reproduced data obtained from each of the tracks by a reproducing means is added.

According to the present invention, when recording data, the same data is recorded on a plurality of tracks by the recording means, and when reproducing the data, the same data is reproduced from each track by the reproduction means, and the reproduced data are added. is output.

Therefore, even if the recording state of data is poor due to a defect in the recording medium, or if the track is destroyed, as long as at least one track is reproduced normally, no data will be lost. , the reliability of data during playback is significantly improved.

Embodiment FIG. 1 is a block diagram showing the basic configuration of a facsimile machine 21 provided with a data recording/reproducing device 17 which is an embodiment of the present invention. The facsimile device 21 sends and receives facsimile messages to and from other facsimile devices via the communication line 10. When receiving faxes,
Image data received via the communication line 10 is demodulated by the modem 9 and provided to the control section 8 . Control unit 8
provides the received image data to the data printing device 14 or the data recording/reproducing device 17, and records it on the recording paper or the magnetic tape 1.

When transmitting a facsimile, image data from the document reading device 11 is given to the control section 8. After modulating the image data with the modem 9, the control unit 8 modulates the image data with the communication line 10.
to other facsimile devices via. At this time,
Image data may also be recorded on the magnetic tape 1.

The control unit 8 includes a display unit 15 that displays the operating status of the facsimile machine 21, and an operation unit 16 that is operated to set and instruct various operations of the facsimile machine 21.
are connected.

The data recording and reproducing device 17 has a magnetic tape 1 and a magnetic tape.
A throat 2, a switch 3, a recording equalizer amplifier 4,
It is configured to include a modulation circuit 5, a reproduction equalizer amplifier 6, a demodulation circuit 7, a differentiation circuit 12, and a cossiparator 13.

The data recording/reproducing device 17 records/reproduces image data received by the facsimile device 21 or image data to be transmitted, as necessary.

For example, while receiving a facsimile, the data printing device 14
If the image data is recorded on the magnetic tape 1 when the recording paper runs out, it is possible to receive facsimiles even until the recording paper is replenished. Furthermore, when using the so-called answering machine function, if the received facsimile is recorded on the magnetic tape 1, the operator can transfer it from the facsimile machine at home to the facsimile machine 2 at home.
The recorded image data can be sent to a facsimile machine outside the home.

Furthermore, when sending a facsimile using the timer function, if the document to be sent is read by the document reading device 11 and recorded on the magnetic tape 1, the document can be set in the facsimile device 21 until the transmission start time. I need it.<
In the meantime, you can send and receive other facsimiles.

FIG. 2 is a timing chart for explaining the recording operation J3 and reproduction operation of the data recording/reproducing device 17, and FIG. 3 is a diagram showing the recording format of the magnetic tape 1. With reference to FIGS. 1 to 3, data recording and reproducing device 17
The recording and reproducing operations will be explained.

When recording data, the control section 8 supplies the recording clock TXC shown in FIG. 2(1) and the recording data TXD shown in FIG. 2(2) to the modulation circuit 5. The modulation port n5 modulates the recording data TXD into an MFM recording signal shown in FIG. The recording equalizer amplifier 4 amplifies the input signal and supplies it to the magnetic head 2 via the switch 3. At this time, the terminals 3a and 3b of the switch 3 are connected by a control signal from the control section 8. The magnetic heads 2L and 2R are shown in Fig. 2 (4).
The write signals shown in FIG. As shown, tracks TRL and TRR are set on the magnetic tape 1, and the same write signal is recorded on each track.

During the above-mentioned recording, the control unit 8 adds and records a synchronization signal with a frequency of 3 kHz, for example, to the recording data TXD in order to identify the recording area when reproducing the magnetic tape 1 and to synchronize the reproduction. . That is, as shown in FIG. 3, the recording data TXD is stored in the recording area L2. R2, and the synchronization signal is recorded in recording areas LL, L3. Recorded in R1 and R3.

When reproducing data, the controller 8 controls the terminal 3a of the switch 3.
and the terminal 3C, and the magnetic tape 1 is reproduced by the magnetic head 2. At this time, the magnetic heads 2L and 2R reproduce tracks TRL and TRR, respectively. The head outputs from the magnetic heads 2L and 2R are shown in FIG.

The differentiating circuit 12 differentiates the added head output and calculates the second
The differential waveform shown in Figure (6) is output. Comparator 13
determines whether the differential waveform from the differentiating circuit 12 crosses zero or not, and if it crosses zero, the level of the output signal is inverted as shown in FIG. 2 (7).

The output signal (MFM reproduction signal) from the comparator 13 is given to the demodulation circuit 7. The demodulation circuit 7 converts the MFM reproduction signal into a reproduction clock RX shown in FIG. 2 (8>).
C and reproduced data RXD shown in FIG. 2 (9) are demodulated and provided to the control section 8. The control section 8 supplies the reproduced data RXD to the data printing device 14 to record it on recording paper, or modulates it with the modem 9 and transmits it to another facsimile device.

During the recording/reproduction described above, for example, the track TRL
Even if normal recording or playback cannot be performed because the recording area L2 of the track TRR is scratched or has dust attached, if the track TRR can record or play back normally, the playback signal level will be -6 dB. It will be about. Here, if data is recorded on only one track,
When data cannot be recorded or reproduced correctly as described above, the reproduced signal level is about -30 dB.

The comparator 13 operates erroneously for signals of -20 dB or less, so if data is recorded and reproduced only on the l track, the data cannot be faithfully reproduced. like 2
When the same data is recorded and reproduced on two tracks TRL and TRR, data can be faithfully reproduced even if data dropout occurs.

As described above, according to this embodiment, even if data dropout occurs during reproduction of the magnetic tape 1, the data can be faithfully reproduced, and the reliability of the reproduced data by the data recording and reproducing device 17 is significantly improved. improves. Moreover, since it is not necessary to change the lateral apertures of other circuits by simply using the two magnetic heads 2L and 2R, the present invention can be implemented at relatively low cost.

As another embodiment, data may be recorded by FM modulation, and the number of magnetic heads may be three or more.

Effects of the Invention As described above, according to the present invention, even if the recording state of data is poor due to a defect in the recording medium, or if a track is destroyed, at least one track can be reproduced normally. If this is done, data will not be lost and the reliability of data during playback will be significantly improved.

[Brief explanation of drawings]

FIG. 1 shows a data recording/reproducing device 1 which is an embodiment of the present invention.
FIG. 2 is a timing chart for explaining the operation of the data recording and reproducing device 17, and FIG. 3 is a diagram showing the recording format of the magnetic tape 1. . 1. Magnetic tape, 2L, 2R magnetic head, 5. Modulation circuit, 7. Demodulation circuit, 8. Control unit, 12 differentiation circuit, 13. Comparator, 17. Data recording/reproducing device. , 21...Facsimile machine, L1 to L3 R
1-R3...recording area, TRL, TRR...track

Claims (1)

[Claims] The present invention includes a recording means for recording data on a plurality of tracks of a recording medium, and a reproduction means for reproducing data from the recording medium, and when recording data, the same data is recorded on a plurality of tracks by the recording means. A data recording and reproducing apparatus characterized in that the data is recorded on each track, and when reproducing data, the reproduced data obtained from each track by a reproducing means is added.