JPH05135547A - Magnetic recording / reproducing device - Google Patents

Abstract

(57) [Abstract] [Purpose] An object of the present invention is to provide a magnetic recording / reproducing apparatus for surely reading ID information without off-track in reproduction after ID post-recording. [Structure] A switch S6 is provided at the input of the autotracking circuit 33 to input signals from the preceding heads 2a and 2b during normal reproduction and signals from the following heads 3a and 3b during ID post-recording.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic recording / reproducing apparatus such as a rotary type digital audio tape recorder.

[0002]

2. Description of the Related Art In recent years, a magnetic recording / reproducing apparatus is required to have high reliability capable of surely reproducing recorded data. In particular, a rotary type digital audio tape recorder (hereinafter referred to as R-DAT) in the field of commercial use is provided with a simultaneous monitor function for always monitoring the recording state at the time of recording in order to confirm whether or not recording can be reliably performed. ing. Also, this is carried outdoors and recorded, and after recording the ID such as the program number at the place of the sound necessary for editing after recording (hereinafter referred to as ID dubbing).
However, when searching for that portion thereafter, a device that searches for an ID and uses it is required to be able to reliably reproduce the data recorded by ID post-recording.

A simultaneous monitoring operation, an ID dubbing operation, and a subsequent reproducing operation in a conventional magnetic recording / reproducing apparatus having a simultaneous monitoring function will be described below.

FIG. 5 is a block diagram showing a configuration of a conventional magnetic recording / reproducing apparatus, FIG. 6 is a positional relationship diagram between a head and a tape on a rotary drum of the conventional magnetic recording / reproducing apparatus, and FIG. 7 is a conventional magnetic recording / reproducing apparatus. FIG. 8 is a diagram showing the positional relationship between the tracks on the tape and the head during simultaneous monitoring of the recording / reproducing apparatus, FIG. 8 is a timing chart showing the switching operation of each switch during simultaneous monitoring, and FIG. 9 is an ID dubbing of the conventional magnetic recording / reproducing apparatus. 10 is a positional relationship diagram of tracks on the tape and the head, FIG. 10 is a timing chart showing a switching operation of each switch at the time of ID post-recording, and FIG. 11 is a tape at the time of reproduction after the ID post-recording of the conventional magnetic recording / reproducing apparatus. It is a positional relationship diagram of an upper track and a head.

In FIG. 5, 2a, 2b, 3a and 3b are heads on a rotary drum, 21 is a microphone amplifier, and 22 is A.
/ D converter, 23 and 28 are signal processing LSIs, 24
a, 24b are recording amplifiers, 25a, 25b, 26a, 2
6b is a reproduction amplifier, 27 is an equalizer and PLL, and 29 is D /
A converter, 30 is a line amplifier, 31 is an ID input key, 32 is an ID display, 33 is an auto tracking circuit (ATF), 34 is a capstan motor, 35 is a system controller, and S1 and S2 are heads 2a and 2b. Switches S3 and S4 for connecting the recording amplifiers 24a and 24b or the reproducing amplifiers 25a and 25b, respectively, and S3 and S4 respectively connect the heads 3a and 3b to the recording amplifiers 24a and 24b or the reproducing amplifiers 26a and 2b.
A switch for switching whether to connect to 6b, S5 is equalization,
This is a switch for switching between sending the outputs of the reproduction amplifiers 25a and 25b to the PLL circuit 27 or sending the outputs of the reproduction amplifiers 26a and 26b. The operation of each of these switches is set by the system controller 35.

In FIG. 6, 7 is a magnetic tape, 1 is a rotating drum which rotates in a counterclockwise direction, and 4a and 4b are running tapes so that the magnetic tape 7 is wound around the rotating drum 1 at an angle of ψ. It is a traveling guide column that determines the route.

Reference numerals 2a and 2b are paired first magnetic heads having different azimuths, which are mounted on the first plane in the rotary drum 1 so as to face each other by 180 degrees. 3a, 3
Reference numeral b denotes a pair of second magnetic heads having different azimuths, which are mounted on the second plane having a certain level difference from the first plane in the rotary drum 1 so as to face each other by 180 degrees. The magnetic heads 2a and 3a have the same azimuth, and the track rows 10a, 11a, 12a in FIG.
The magnetic heads 2b and 3b have the same azimuth and trace the track rows 10b and 11b in FIG. Here, the magnetic head 2a is the magnetic head 3
The tracks of the track rows 10a, 11a, 12a are traced prior to a, and the magnetic head 2b is replaced by the magnetic head 3b.
Prior to the above, each track of the track rows 10b and 11b is traced. Furthermore, the magnetic heads 2a, 2
In order to prevent two or more heads of b, 3a and 3b from tracing the track row at the same time, the winding angle ψ,
The level difference between the first and second planes of the rotary drum 1 and the head mounting angle (90 + θ) are set. That is, as shown in the example of FIG. 7, when the head 3a reaches the end of the track 11a, the head 2a moves to the track 12a.
The magnetic heads 2a and 3a,
b and 3b each have an angle of (90 + θ) degrees, and the winding angle ψ is set to be larger than that.

In FIG. 5, at the time of recording, the head S is used for recording and the trailing head is used for simultaneous reproduction.
Reference numerals 1 and S2 connect the preceding heads 2a and 2b to the recording amplifiers 24a and 24b, switches S3 and S4 respectively connect the following heads 3a and 3b to the reproducing amplifiers 26a and 26b, and switch S5 controls the reproducing amplifiers 26a and 26b. Is connected to the PLL circuit 27. The microphone input signal is amplified by the microphone amplifier 21, converted into a digital signal by the A / D converter 22, and is a recording signal processing LSI 23.
The recorded data of Ach and Bch is displayed at switch S
The recording amplifiers 24a and 24b send the recording heads 1a and 2b to the preceding heads 2a and 2b and record them on the tape. Here, the recorded data is reproduced by the trailing heads 3a and 3b, the signal thereof is amplified by the reproduction amplifiers 26a and 26b through the switches S3 and S4, and is equalized through the switch S5.
The PLL circuit 27 corrects the magnetic distortion, reproduces the data clock, and the reproduction signal processing LSI 28 performs error correction.
It is converted into an analog signal by the D / A converter 29 and output through the line amplifier 30. At the same time, the ID information is sent from the signal processing LSI 28 to the display 32 and displayed. The signal from the switch S5 is sent to the ATF circuit 33, but during recording, the ATF circuit does not operate and the capstan motor 34 runs by itself. In this way, simultaneous monitoring is realized. FIG. 7 shows a positional relationship diagram between a track on a tape and a head when simultaneously monitoring the conventional magnetic recording / reproducing apparatus. In order to reliably monitor the recorded data at the same time, the trailing head sets the mounting height of each head so as to travel the center of the track recorded by the preceding head. FIG. 8 shows a timing chart of recording, reproduction, and switching operation of each switch during simultaneous monitoring. t is a time domain division as each head traces a track. 10
Reference numerals a, 10b, 11a, 11b, and 12a are the tracks shown in FIG. For example, the track 11a recorded by the leading head 2a at the time t2 is recorded on the trailing head 3a at the time t5.
Confirm that it is played back and recorded properly. Figure 7
The positional relationship between the head and the track shown in is from time t5 to t6.
It is when moving to.

On the recording track of the R-DAT, a PCM area for recording stereo music information, a SUB code area for recording IDs such as program numbers and times, and a tracking signal for the head to travel on the track are recorded. There are three types of ATF areas. At the time of ID post-recording, the ID information in the SUB code reproduced by the preceding head is read, the ID information of the SUB code is changed, and the SUB code area is recorded again by the succeeding head.

FIG. 10 shows a timing chart of reproduction, dubbing, and switching operation of each switch during ID dubbing. The reproduction signal reproduced by the preceding heads 2a, 2b passes through the switches S1, S2, is amplified by the reproduction amplifiers 25a, 25b, and is sent from the switch S5 to the ATF circuit 33.
Track the leading head to trace the center of the track. The ID information to be newly recorded is input from the ID input key 31, and the recording signal processing LSI 23
Recorded data for ch and Bch, and switches S3 and S4
Through the recording amplifiers 24a and 24b to the trailing head 3
a, 3b, and recorded on the tape. Switch S
3, S4 are trailing heads 3a, 3 only in the SUB code area.
Since b is connected to the recording amplifiers 24a and 24b, respectively, only the SUB code area can be rewritten. For example, the track 11a reads the ID information reproduced by the preceding head 2a at time t2, and reads it at the succeeding head 3b at time t5.
Rewrite with. In this way, ID dubbing is realized. FIG. 9 shows a positional relationship diagram between a track on a tape and a head during ID after-recording of a conventional magnetic recording / reproducing apparatus. Data is reproduced by the preceding heads 2a and 2b, and ATF
Since the tracking is applied, the preceding head runs at the center of the track. In the meantime, the trailing heads 3a and 3b travel at a position deviated from the center of the track to the left with respect to the head traveling direction.

During normal reproduction after ID dubbing, the switches S1 and S2 connect the preceding heads 2a and 2b to the reproduction amplifiers 25a and 25b, respectively, and the switches S3 and S4 connect the following heads 3a and 3b to the reproduction amplifiers 26a and 2b, respectively.
6b and the switch S5 is a reproduction amplifier 25a, 25
b is equalized and connected to the PLL circuit. The data on the tape is reproduced by the preceding heads 2a and 2b, the signal is amplified by the reproduction amplifiers 25a and 25b through the switches S1 and S2, is equalized through the switch S5, and the magnetic distortion is corrected by the PLL circuit 27. Clock reproduction and signal processing LS for reproduction
The error is corrected by I28, converted into an analog signal by the D / A converter 29, and output through the line amplifier 30. Further, the signal from the switch S5 is sent to the ATF circuit 33, and the rotation speed of the capstan motor 34 is controlled so that the head runs on the center of the track on the tape. FIG. 11 shows the ID of the conventional magnetic recording / reproducing apparatus.
It is a positional relationship diagram of a track and a head on the tape at the time of reproduction after dubbing. The shaded area is the post-recorded SUB code area. Since the preceding heads 2a and 2b perform tracking with the signal of the ATF area which is not post-recorded, they run at the center of the old track.

[0012]

However, in the above-mentioned conventional structure, the ID post-recorded track is formed so as to be largely deviated to the left side with respect to the head traveling direction. When reproducing this, the preceding head cannot overlap and reproduce all of the post-recording track, and offtracks the thick shaded portion in FIG. For this reason, the reproduction output of the SUB code area is lowered, erroneous detection of data occurs, and the ID information cannot be read.

The present invention solves the above-mentioned problems of the prior art. Even if simultaneous monitoring is possible and ID dubbing is performed, I
An object of the present invention is to provide a magnetic recording / reproducing apparatus capable of surely reproducing a post-recorded track.

[0014]

In order to achieve this object, the recording / reproducing apparatus of the present invention is provided with a switch at the input of the ATF tracking circuit so that the signal from the preceding head is transmitted during normal reproduction and the signal is transmitted after the ID after-recording. It has a configuration for switching and inputting signals from the row head.

[0015]

According to the present invention, since the ATF tracking is performed by the follow-up head at the time of ID post-recording, the trailing head is post-recording the SUB code area while traveling the center of the track. In the reproduction after the ID dubbing, the reproduction is performed while the ATF tracking is performed by the preceding head. At this time, the preceding head travels at the same position as the succeeding head at the time of ID post-recording, so that the ID information can be read without off-tracking.

[0016]

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

FIG. 1 is a block diagram showing the arrangement of the magnetic recording / reproducing apparatus of the present invention. FIG. 2 is a timing chart showing recording, dubbing, and switching operation of each switch at the time of ID dubbing, FIG. 3 is a positional relationship diagram between the track and the head on the tape at the time of ID dubbing, and FIG. 4 is at the time of playing after the ID dubbing. FIG. 6 is a positional relationship diagram between a track on a tape and a head.

In FIG. 1, 2a, 2b, 3a and 3b are heads on the rotary drum 1, 21 is a microphone amplifier, 22 is an A / D converter, 23 and 28 are signal processing LSIs, 24
a, 24b are recording amplifiers, 25a, 25b, 26a, 2
6b is a reproduction amplifier, 27 is an equalizer and PLL, and 29 is D /
A converter, 30 is a line amplifier, 31 is an ID input key, 32 is an ID display, 33 is an auto tracking circuit (ATF), 34 is a capstan motor, 35 is a system controller, and S1 and S2 are heads 2a and 2b. Switches S3 and S4 for connecting the recording amplifiers 24a and 24b or the reproducing amplifiers 25a and 25b, respectively, and S3 and S4 respectively connect the heads 3a and 3b to the recording amplifiers 24a and 24b or the reproducing amplifiers 26a and 2b.
A switch for switching whether to connect to 6b, S5 is equalization,
A switch for switching whether the outputs of the reproduction amplifiers 25a and 25b or the outputs of the reproduction amplifiers 26a and 26b are sent to the PLL circuit 27. S6 sends the outputs of the reproduction amplifiers 25a and 25b to the ATF tracking circuit 33 or the reproduction amplifier 26a. , 26b are output. The operation of each of these switches is set by the system controller 35.

In FIG. 1, at the time of recording, recording is performed by the preceding head and simultaneously reproduced by the following head.
Reference numerals 1 and S2 connect the preceding heads 2a and 2b to the recording amplifiers 24a and 24b, switches S3 and S4 respectively connect the following heads 3a and 3b to the reproducing amplifiers 26a and 26b, and switch S5 controls the reproducing amplifiers 26a and 26b. Is connected to the PLL circuit and the switch S6 is used for the reproduction amplifier 2
Connect 6a and 26b to the ATF tracking circuit. The microphone input signal is amplified by the microphone amplifier 21, converted into a digital signal by the A / D converter 22 and becomes recording data of Ach and Bch by the recording signal processing LSI 23, and the recording amplifiers 24a, 2 are passed through the switches S1, S2.
It is sent from 4b to the preceding heads 2a and 2b and recorded on the tape 7. Here, the recorded data is the following head 3
a, 3b, and the signals are reproduced by switches S3, S4.
Is amplified by the reproduction amplifiers 26a and 26b, equalized through the switch S5, the magnetostriction is corrected by the PLL circuit 27, the data clock is reproduced, error correction is performed by the reproduction signal processing LSI 28, and the D / A converter 29 is used. It is converted into an analog signal and output through the line amplifier 30. Further, the signals from the reproduction amplifiers 26a and 26b are sent to the ATF circuit 33 by the switch S6, and the rotation speed of the capstan motor 34 is controlled so that the preceding heads 2a and 2b run on the center of the track on the tape. .. In this way, simultaneous monitoring is realized.

The positional relationship between the head and the tape on the rotary drum of the magnetic recording / reproducing apparatus of the present invention is the same as that of the conventional example shown in FIG. Further, the positional relationship between the track on the tape and the head during simultaneous monitoring of the magnetic recording / reproducing apparatus of the present invention is the same as that of the conventional example shown in FIG.

At the time of ID post-recording, the SUB code information reproduced by the preceding head is read, and the I of the SUB code is read.
The D information is changed and recording is performed by the trailing head. FIG. 2 shows a timing chart of the switching operation of the leading head, the trailing head, and each switch at the time of ID dubbing. Preceding head 2
The reproduced signals reproduced by a and 2b are the switches S1 and S.
The signal is amplified by the reproduction amplifiers 25a and 25b via the switch 2, equalized from the switch S5, sent to the PLL circuit 27, and thereafter output through the signal processing LSI 28, the D / A converter 29, and the line amplifier 30. In addition, the trailing heads 3a and 3b
Are connected to the recording amplifiers 24a and 24b only in the SUB code area by the switches S3 and S4. Newly record I
The D information is input from the ID input key 31, becomes recording data of Ach and Bch in the recording signal processing LSI 23,
Recording amplifiers 24a, 24b through switches S3, S4
Is sent to the trailing heads 3a and 3b and recorded on the tape. In this way, only the SUB code area is rewritten.
For example, the track 11a reads the ID information reproduced by the preceding head 2a at time t2, and rewrites it by the succeeding head 3b at time t5. Further, in the areas other than the SUB code area, the trailing heads 3a and 3b have switches S3 and S.
At 4, the reproduction amplifiers 26a and 26b are connected. This reproduction signal is sent from the switch S6 to the ATF circuit 33, and tracking is performed so that the succeeding head traces the center of the track. In this way, ID dubbing is realized. FIG. 3 shows the positional relationship between the tracks on the tape and the head during ID dubbing in the magnetic recording / reproducing apparatus of the present invention.
Since the ATF tracking is performed by the trailing heads 3a and 3b, the trailing follower head is running at the center of the track and S
Post-record the UB code area.

During normal reproduction after ID dubbing, the switches S1 and S2 connect the preceding heads 2a and 2b to the reproduction amplifiers 25a and 25b, respectively, and the switches S3 and S4 connect the succeeding heads 3a and 3b to the reproduction amplifiers 26a and 26, respectively.
b, and the switch S5 is a reproduction amplifier 25a, 25b.
Is connected to the equalization and PLL circuit, and the switch S6 connects the reproduction amplifiers 25a and 25b to the ATF circuit 33. The data on the tape is reproduced by the preceding heads 2a and 2b, and the signal passes through the switches S1 and S2 and the reproduction amplifiers 25a and 2a.
Amplified by 5b, equalized through the switch S5, the magnetostriction is corrected by the PLL circuit 27, the data clock is reproduced, the error is corrected by the reproduction signal processing LSI 28, and the analog signal is converted by the D / A converter 29. Line amplifier 3
It is output through 0. Further, the signal from the switch S6 is sent to the ATF circuit 33, and the capstan motor 3 is moved so that the preceding head runs on the center of the track on the tape.
The rotation speed of 4 is controlled. FIG. 4 is a positional relationship diagram between a track on the tape and a head during reproduction after ID dubbing of the magnetic recording / reproducing apparatus of the present invention. The shaded area is the post-recorded SUB code area. Since the preceding heads 2a and 2b perform tracking with the signal of the ATF area which is not post-recorded, they run at the center of the old track.

As described above, according to the present embodiment, since the ATF tracking is performed by the follow-up head at the time of ID post-recording, the follow-up head runs SU in the center of the track.
Dubbing the B code area. In the reproduction after the ID post-recording, the reproduction is performed while the ATF tracking is performed by the preceding head, the preceding head also travels in the center of the track, and travels at the same position as the following head during the ID post-recording. Therefore,
It is possible to reliably read the ID information without offtracking the post-recorded SUB code area and without reducing the reproduction output of the SUB code and erroneously detecting the data.

[0024]

As is apparent from the above embodiments, the magnetic recording / reproducing apparatus according to the present invention can reproduce the track recorded by the preceding head with the allowance with the trailing head at the time of simultaneous monitoring, and can prevent the deviation of the linearity. It is possible to realize R-DAT that does not cause erroneous detection of data and reliably detects ID information even after reproduction after ID post-recording.

Although an example of post-recording in the SUB code area has been described here, similar effects can be obtained in post-recording in the PCM area. Further, since heads having the same track width can be used for the leading and trailing heads, it is possible to suppress an increase in product cost from the effect of mass production of heads, and the present invention can be realized with a simple circuit configuration. There is no hindrance to the miniaturization of equipment.

[Brief description of drawings]

FIG. 1 is a block diagram showing an arrangement configuration of a magnetic recording / reproducing apparatus according to an embodiment of the present invention.

FIG. 2 is a timing chart showing a switching operation of a destination head, a trailing head, and each switch at the time of device ID post-recording.

FIG. 3 is a positional relationship diagram between a track on a tape and a head during ID dubbing of the device.

FIG. 4 is a positional relationship diagram between a track on a tape and a head during reproduction after ID dubbing of the same device.

FIG. 5 is a block diagram showing a configuration of a conventional magnetic recording / reproducing apparatus.

FIG. 6 is a positional relationship diagram of a head and a tape on a rotary drum of the same device.

FIG. 7 is a positional relationship diagram of tracks and heads on a tape when the same device is simultaneously monitored.

FIG. 8 is a timing chart showing the switching operation of each switch during simultaneous monitoring of the device.

FIG. 9 is a positional relationship diagram between a track on a tape and a head during ID dubbing of the device.

FIG. 10 is a timing chart showing the switching operation of each switch during ID dubbing of the device.

FIG. 11 is a positional relationship diagram of a track on a tape and a head during reproduction after ID dubbing of the same device.

[Explanation of symbols]

 2a, 2b Leading head 3a, 3b Trailing head 21 Microphone amplifier 22 A / D converter 23, 28 Signal processing LSI 24a, 24b Recording amplifier 25a, 25b, 26a, 26b Reproducing amplifier 31 ID input key 32 ID indicator 33 Auto Tracking circuit (ATF) 34 Capstan motor 35 System controller S1, S2, S3, S4 Head changeover switch S6 Tracking signal changeover switch

Claims (1)

[Claims] 1. A signal processing section for processing an input signal as a recording signal and generating a signal for recording a tracking signal in a predetermined area of a track on a magnetic tape during recording.
A recording amplifier that sends a recording signal from the signal processing unit to the head, a preceding head that is attached to a rotating drum to record the recording signal from the recording amplifier at the time of recording to helically scan the magnetic tape, and the magnetic head. A trailing head for reproducing a signal recorded on the track, which is attached to the preceding head for recording a track train on the tape so as to alternately and independently trace the track after recording, and from the recording amplifier at the time of recording. The preceding head changeover switch which sends the recording signal of the preceding head to the preceding head during reproduction and sends the reproduced signal from the preceding head to the reproducing amplifier, and the reproducing signal from the following head during recording to the reproducing amplifier, and the tracking signal area during post-recording. In the area where data is not rewritten, the reproduction signal from the following head is reproduced. To the following head, and sends the recording signal from the recording amplifier to the following head only in the area where the data is rewritten, and the signal from the preceding head to the tracking circuit during reproduction, and the following head during post-recording. Magnetic recording / reproducing apparatus provided with a tracking signal changeover switch for sending a signal from the recording circuit to a tracking circuit.