JP2770506B2 - Magnetic recording / reproducing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention will be described in the following order.

A Field of application in industry B Outline of the invention C Conventional technology D Problems to be solved by the invention E Means to solve the problems (FIGS. 1, 4 and 5) Figures, FIGS. 4 and 5) G Embodiment (FIGS. 1 to 5) (G1) Configuration of Embodiment (G1-1) Configuration of Control Data (G1-2) Digital Signal Processing Circuit (G2) Operation of Embodiment (G3) Effects of Embodiment (G4) Other Embodiments H Effects of the Invention A Industrial Field of the Invention The present invention relates to a magnetic recording and reproducing apparatus, for example, a digital audio tape recorder for recording and reproducing digital audio signals. Applicable.

B. Summary of the Invention The present invention provides a magnetic recording / reproducing apparatus which records a digital signal and its error correction code in an area for recording a recording current adjusting reference signal output from a built-in reference signal generating circuit, thereby simplifying the recording and reproducing operation. And the recording current can be adjusted.

C Prior Art Conventionally, there has been a magnetic recording / reproducing apparatus capable of recording / reproducing a digital audio signal using a rotating drum (hereinafter referred to as a digital audio tape recorder).

In such a digital audio tape recorder, audio quality can be recorded and reproduced at a high density while sound quality deterioration is effectively avoided.

D Problems to be Solved by the Invention By the way, in this kind of digital audio tape recorder, since it is inevitable to vary between magnetic heads, in order to obtain compatibility between the digital audio tape recorders, the recording current must be increased for each magnetic head. Need to be adjusted.

For this reason, conventionally, in this type of digital audio tape recorder, at the time of assembling, before assembling a circuit board of a signal processing circuit system, the recording current is adjusted by connecting to a special jig.

Therefore, it is considered that assembling work can be simplified if the recording current can be easily adjusted without connecting to such a special jig.

Further, it is considered that the repair work when the rotating drum is replaced can be simplified.

The present invention has been made in view of the above points, and has as its object to propose a magnetic recording / reproducing apparatus capable of easily adjusting a recording current.

E. Means for Solving the Problem In order to solve such a problem, in the present invention, a recording signal S _REC composed of various signals including an output signal corresponding to a digital signal is provided on a rotating drum 20 around which a magnetic tape 15 is wound. By outputting to the first and second magnetic heads 28A and 28B, different signals are recorded on the recording track on the magnetic tape 15 in accordance with the scanning positions of the first and second magnetic heads 28A and 28B. while recording a signal S _REC, the magnetic recording and reproducing apparatus 1 der connexion reproducing the recorded signal S _REC recorded on the magnetic tape 15, the recording current flowing through the first and or the second magnetic head 28A and or 28B Control means 6 for outputting control data D _CONT for adjustment;
The first and second magnetic heads 28A and 28A are provided in the upper recording track.
Create a recording current adjustment reference signal of a different frequency according to each signal recorded according to the 8B scanning position,
A reference signal generating circuit 74, 76 and 78 for outputting a recording current adjustment reference signal corresponding based on the control data D _CONT derived from the control means 6, based on the control data D _CONT derived from the control means 6, the output a selection circuit 72 for outputting a recording signal S _REC comprising recording current adjustment reference signal obtained from the reference signal generating circuit 74, 76 and 78 instead of the signal, the recording signal S _REC obtained from the selection circuit 72 While recording on the magnetic tape 15 via the corresponding first and / or second magnetic heads 28A and / or 28B, the recording signal S _REC recorded from the magnetic tape 15 is recorded on the corresponding first and / or second magnetic heads. Reproduced through 28A and / or 28B, and flows to the corresponding first and / or second magnetic heads 28A and / or 28B based on the recording current adjustment reference signal included in the reproduced recording signal S _REC. Recording to adjust the recording current Current adjustment means 3
2 is provided.

F operation Based on control data D _CONT output from the control means 6 for adjusting the recording current flowing through the first and / or second magnetic heads 28A and / or 28B, reference signal generating circuits 74 and 76 are provided.
And 78, of the recording current adjustment reference signals of different frequencies created in accordance with various signals recorded in accordance with the scanning positions of the first and second magnetic heads 28A and 28B on the recording track on the magnetic tape 15. A recording current adjustment reference signal corresponding to the adjustment of the recording current, and the recording circuit including the recording current adjustment reference signal obtained from the reference signal generation circuits 74, 76 and 78 in place of the output signal from the selection circuit 72. Signal S _REC
And the recording current adjusting means 32 outputs the recording signal S _REC.
Corresponding to the first and / or second magnetic heads 28A and / or 2
While recording on the magnetic tape 15 via 8B, the recording signal S _REC recorded from the magnetic tape 15 is reproduced via the corresponding first and / or second magnetic heads 28A and / or 28B. By adjusting the recording current flowing through the corresponding first and / or second magnetic heads 28A and / or 28B based on the recording current adjustment reference signal included in the obtained recording signal S _REC , the recording current S When recording various signals included in the _REC , the recording current flowing through the first and / or second magnetic heads 28A and / or 28B can be easily adjusted.

G Example Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

(G1) in FIG. 1 configuration of Embodiment 1 as a whole shows a digital audio tape recorder, and records by converting the audio signal S _IN of the stereo system into a digital signal.

That is, in the digital audio tape recorder 1, the input display circuit 2 of the arithmetic processing circuit outputs the operation data D _SOU in response to the operation of the operation element, and switches the display on the display panel based on the predetermined control data. .

Thus, in the digital audio tape recorder 1, the operation mode is switched in response to the operation of the operation element, and the operation state can be confirmed through the display on the display panel.

The system control circuit 6 stores the operation data D _SOU during recording.
, The control data D _CONT is generated, and the control data D _CONT is output to the digital signal processing circuit 8, the mechanical control circuit 10, and the servo circuit 12.

Thus, the system control circuit 6 switches and controls the operation of the digital audio tape recorder 1 in response to the operation of the operation element.

On the other hand, at the time of reproduction, the system control circuit 6 controls the control data based on the status byte data output from the digital signal processing circuit 8 in addition to the operation data D _SOU.
D _CONT is generated, thereby switching the operation of the digital audio tape recorder 1 in response to the operation of the operation element, and changing the magnetic tape 15 in accordance with the recording format of the digital audio signal recorded on the magnetic tape 15. Has been made to play.

The mechanical control circuit 10 drives and controls a tape cassette loading / unloading mechanism, a magnetic tape loading mechanism, and the like based on the control data D _CONT output from the system control circuit 6.

On the other hand, the servo circuit 12 drives the reel motor 16 based on the control data D _CONT , thereby rotating the reel of the magnetic tape cassette (not shown) at a predetermined speed.

Further, the servo circuit 12 switches the switching pulse signal SWP at which the signal level switches at the start of the magnetic head scanning.
By driving the drum motor 22 based on the control data D _CONT so that the switching pulse signal SWP and the rotating drum reference signal DREF are in phase synchronization,
The rotating drum 20 rotates at a predetermined speed.

The rotating drum reference signal DREF has a duty ratio of 50 [%] that is repeated at an interleave cycle of 60 [msec] and 30 [msec] in the LP mode and the SP mode (the long time recording mode and the standard time recording mode, respectively). Consists of a reference signal.

Further, during recording and reproduction, the servo circuit 12 drives the capstan motor 26 so that the magnetic tape 15 runs by a predetermined amount in one interleave cycle, so that the magnetic tape 15 runs at a predetermined running speed. It has been done.

At this time, during reproduction, the servo circuit 12 controls the rotation phase of the capstan motor 26 based on the tracking error signal output from the tracking control circuit 24, thereby performing tracking control.

Thus, in the magnetic tape 15 and the rotating drum 20,
It is driven at a predetermined speed in accordance with the control data D _CONT , whereby the audio signals S _IN , S _IN according to the format standardized by the digital audio tape recorder.
_OUT can be recorded and reproduced.

Audio signal converting circuit 30, analog-to-digital conversion circuit is constituted by a digital-to-analog converter and the digital filter circuit, and outputs the recording, the digital signal processing circuit 8 converts the audio signal S _IN to digital audio signal D _AU.

On the other hand, during playback, the audio signal conversion circuit 30
The digital audio signal D _AU outputted from the digital signal processing circuit 8 and outputs the converted analog signal S _OUT.

The digital signal processing circuit 8 controls the control data D during recording.
After converting the digital audio signal D _AU into a recording signal S _REC based on _CONT , the recording signal S _REC is output to the magnetic heads 28A and 28B via the recording / reproducing amplifying circuit 32, whereby the digital audio tape A digital audio signal D _AU is recorded on a magnetic tape 15 in a format standardized for a recorder.

On the other hand, during reproduction, the digital signal processing circuit 8
It switches the operation based on the control data D _CONT, thereby outputting to the audio signal conversion circuit 30 converts the reproduced signal S _RF in the digital audio signal D _AU.

Thus it demodulates the reproduced signal S _RF outputted from the magnetic head 28A and 28B, are made to be able to reproduce the audio signal.

(G1-1) Configuration of Control Data Here, the control data D _CONT is composed of an 8-bit mode byte and a status byte.
On the other hand, at the time of reproduction, the mode byte data is generated by the system control circuit 6 and the status byte data is generated by the digital signal processing circuit 8 during reproduction.

That is, as shown in FIG. 2, in the mode byte,
The upper two bits are assigned mechanism information indicating the diameter of the rotary drum 26 and the arrangement of the magnetic heads, and the servo circuit 12
Is output from the system control circuit 6.

That is, the bits are "00", "01", "10", "1".
"1" indicates that the configuration of the rotary drum 20 and the magnetic heads 28A and 28B constituting the digital audio tape recorder 1 are A type, B type, C type and D type.

As a result, in the servo circuit 12 and the digital signal processing circuit 8, the operation mode is switched in accordance with various configurations represented by the upper two bits of the mode byte. For example, various digital types such as a stationary type and a portable type are provided. It is designed to be commonly used for audio tape recorders.

On the other hand, the third bit indicates whether or not the test signal mode is set. When the third bit and the fourth bit have the value "0",
The reproduction mode represents the recording mode when the third bit is a value "0" and the fourth bit is a value "1".

The sixth bit indicates a normal mode for reproducing at a normal reproducing speed or a double speed mode for reproducing at twice the normal speed.

As a result, the mode byte becomes “−−001000” or “−−−
001100 ", it is possible to detect that the subcode is a post-recording mode in the normal mode or the double speed mode, respectively, and when" --01-0 ---- "or" --- 01-1 ---- ", respectively, the normal mode Alternatively, the recording mode of the double speed mode can be detected.

Here, when the mode byte is “−−01−−0−” or “−−01−1−1−”, it indicates the recording start or recording state, respectively, and “−” indicates that the bit is “0” or “1”. "Means that any of them may be used.

On the other hand, when the third bit is "1", it indicates that the digital audio tape recorder 1 is in the test signal recording mode. When both the fourth and fifth bits are "1", the A head is set. While the recording current adjustment reference signals for the 28A and 28B heads 28B are recorded, the fourth and fifth recording current adjustment reference signals are recorded.
When the bits are "1" and "0", the recording current adjustment reference signal for the A-head 28A is used, and the fourth and fifth bits are "0".
In the case of "1", the recording current adjustment reference signal for the B head 28B is recorded.

Further, at this time, the following sixth to eighth bits indicate the frequency of the recording current adjustment reference signal. In this embodiment, the frequency is switched based on the channel clock signal.

On the other hand, as shown in FIG. 3, in the status byte, when "100-01--" is recorded in a long time mode (hereinafter referred to as LP mode) or when a magnetic tape recorded in the LP mode is used. To play
When "01-01", a magnetic tape recorded with 1.5 times the normal track pitch is reproduced.
The double track pitch mode is described as "100-01-
If the value is other than "-" and "01 --- 01", it is identified that the recording is in the standard mode (hereinafter referred to as SP mode) or the magnetic tape recorded in the SP mode is reproduced. ing.

(G1-2) Digital Signal Processing Circuit As shown in FIG. 4, in the digital signal processing circuit 8, the data input / output circuit 40 includes control data D _CONT and frame address data F output from the system control circuit 6.
Enter data DATA such as _ID , time information, pack data, etc.
The data is stored in a predetermined area of the memory circuit 44 via the memory interface circuit 42.

On the other hand, at the time of reproduction, the data input / output circuit 40 outputs the sub-code data demodulated and stored in the memory circuit 44 (that is, data partially including status byte data) to the system control circuit 6. I do.

As a result, the digital signal processing circuit 8 switches the operation based on the control data D _CONT and converts the digital audio signal D _AU into a recording signal S _REC at the time of recording, and outputs it while reproducing, demodulates the reproduced signal S _RF, and to output the digital audio signal D _AU.

The input / output circuit 46 converts the AES / EBU format digital audio signal RX input to the digital audio tape recorder 1 into a predetermined format digital audio signal and outputs the digital audio signal to the digital signal input / output circuit 52.

Further, the input / output circuit 46 includes a digital signal input / output circuit 52.
Is converted into an AES / EBU-formatted digital audio signal TX and output. With this digital audio tape recorder 1, the analog audio signals S _IN and S _OUT which are analog signals are output. In addition, AES / EBU format digital audio signals RX and TX can be recorded and reproduced.

The digital signal input / output circuit 52 is connected to the data bus DT from the memory circuit 44 via the memory interface circuit 42.
_The control data D _CONT output to the _BUS is loaded, and the operation is switched based on the control data D _CONT .

Further, the digital signal input / output circuit 52 generates a rotating drum reference signal DREF by sequentially counting a predetermined clock signal by a built-in counter circuit, and also generates a digital audio signal or an audio signal conversion output from the input / output circuit 46. and outputs the digital audio signal D _AU outputted from the circuit 30 to the memory circuit 44 based on the count value of the counter circuit.

As a result, the digital signal input / output circuit 52 sequentially blocks the digital audio signal in one interleave cycle, and performs interleaving processing for each block to convert it into audio data (hereinafter referred to as input audio data). .

On the other hand, during reproduction, the digital signal input / output circuit 52
Loads the reproduced audio data stored in the memory circuit 44 sequentially, and then loads the reproduced audio data with reference to the count value of the counter circuit, thereby performing a deinterleaving process on the reproduced audio data to perform digital audio. after converting the signal D _AU, and outputs the output circuit 46 and audio signal conversion circuit 30.

The error detection and correction circuit 56 includes a digital signal input / output circuit 52.
Similarly to the above, the control data D _CONT is loaded from the memory circuit 44, and the operation is switched according to the control data D _CONT .

At this time, the error detection and correction circuit 56
Load the input audio data stored in 44 sequentially,
After a parity code (in other words, a C1 code and a C2 code) composed of an inner code and an outer code for error correction is generated for each block, the parity code is stored in the memory circuit 44.

At the same time, the error detection and correction circuit 56 sequentially loads the subcode data to be recorded in the subdata area from the memory circuit 44, generates a parity code (C1 code), and stores the parity code (C1 code) in the memory circuit 44.

During reproduction contrast, the error detecting and correcting circuit 56 sequentially loads reproduced data D _PB stored in the memory circuit 44, the memory circuit 44 performs error detection and error correction processing of the reproduced data D _PB Store.

The recording signal generation circuit 60 includes a digital signal input / output circuit 52.
Similarly to the above, the control data D _CONT is loaded from the memory circuit 44, and the operation is switched according to the control data D _CONT .

That is, at the time of recording, the recording signal generation circuit 60
The input audio data, parity code, and the like stored in 44 are sequentially loaded to generate a recording signal S _REC , while the operation is stopped during reproduction.

That is, as shown in FIG.
_Supplies control data D _CONT output from the memory circuit 44 to the control circuit 63 via the data bus DT _BUS .

The control circuit 63 outputs a predetermined control signal to each circuit block of the recording signal generation circuit 60 based on the control data D _CONT , thereby switching the operation of the recording signal generation circuit 60. .

The signal generating circuit 64 generates a predetermined channel clock signal CK (frequency 1) based on the switching pulse signal SWP.
8,816 [MHz]) to generate a reference signal such as a synchronizing signal S _SYNC , as well as generating an operation reference signal for the recording signal generation circuit 60.

Further, the signal generation circuit 64 generates the address data AD _DATA and the read request signal REQ and outputs them to the data bus DT _BUS , thereby reading the recording data D _REC from the memory circuit 44 in the recording signal formation order, and Give to.

The parity code generation circuit 68 generates a simple parity code for data of a predetermined sub-code of the recording data D _REC output from the recording data input circuit 66, and sends the simple parity code to the 8-10 modulation circuit 70 together with the recording data D _REC. Output.

The 8-10 modulation circuit 70 performs 8-10 modulation on the input data, converts the input data into serial data, and outputs the serial data.

The selection circuit 72 switches the contacts at a predetermined timing based on the control signal output from the control circuit 63, whereby the signal generation circuit 64 is switched between the output data of the 8-10 modulation circuit 70.
A recording signal S _REC is generated by adding a reference signal such as a synchronizing signal S _SYNC output from the _CPU .

Further, at this time, the selection circuit 72 adds a pilot signal S _PILOT for ATF (automatic track finding) tracking control output from the ATF signal generation circuit 74 before and after the recording signal S _REC and outputs the digital signal. A recording signal is generated according to a format standardized for an audio tape recorder.

That is, the ATF signal generation circuit 74 divides the channel clock signal CK and divides the frequency bands _fCH / 72, _fCH / 18, _fCH / 12,
f Create four reference signals of _CH / 6.

Further, the ATF signal generation circuit 74 selectively outputs four reference signals based on the scanning position information of the magnetic heads 28A and 28B output from the signal generation circuit 64.

By outputting the recording signal S _REC to the magnetic heads 28A and 28B via the recording / reproducing amplifying circuit 32, the digital audio signal can be recorded in accordance with the format standardized for the digital audio tape recorder. .

Further, in the test signal recording mode, the selection circuit 72 selectively outputs the reference signals output from the reference signal generation circuits 76 and 78 and the ATF signal generation circuit 74 instead of the output signal of the 8-10 modulation circuit.

That is, the reference signal generating circuits 76 and 78 respectively divide the frequency of the channel clock signal CK to divide the frequency bands f _CH / 2 and f _CH
A reference signal for recording current adjustment of / 4 is output.

At this time, during the period in which the output signal is output from the 8-10 modulation circuit, the ATF signal generation circuit 74 outputs the lower 3 bits of the mode byte.
While the reference signal is switched and output according to the bit data, during a period other than the period, the pilot signal S _PILOT for ATF tracking control is generated as in the normal recording operation.

In response to this, the selection circuit 72 outputs a reference signal for recording current adjustment to the AB heads 28A and 28B in the test signal recording mode based on the data of the fourth and fifth bits of the mode byte. During the period in which the recording current is output from the 8-10 modulation circuit, the reference signal for recording current adjustment output from the reference signal generation circuits 76 and 78 or the reference signal output from the ATF signal generation circuit 74 is selectively output. Whereas
In the case where the reference signal for recording current adjustment is recorded only in the head A or B, the reference signal generation circuit 76 and the reference signal generation circuit 76 correspond to the period during which the recording current is output from the 8-10 modulation circuit.
The reference signal for recording current adjustment output from 78 or the reference signal output from the ATF signal generation circuit 74 is selectively output.

At this time, the selection circuit 72 and the ATF signal generation circuit 74
In a period other than the period in which the recording current is output from the modulation circuit, the operation is performed in the same manner as a normal recording operation.

As a result, in the test signal recording mode, a desired recording current adjustment reference signal can be recorded instead of a normal audio signal. At this time, the recording current adjustment reference signal can be recorded instead of the 8-10 modulation circuit output signal. Since the signal is recorded, the recording current adjustment reference signal can be reproduced with reference to the pilot signal S _PILOT for ATF tracking control recorded before and after.

Therefore, based on the reproduction result, the variable resistor for adjusting the recording current
By adjusting 32A and 32B, variations in the magnetic heads 28A and 28B can be adjusted.

Accordingly, the recording signal generation circuit 60 has a reference signal generation circuit 74,
With the built-in components 76 and 78, the recording current can be adjusted without connection to the jig, and the recording current adjustment operation can be simplified accordingly.

Further, at this time, since the recording current adjustment reference signal was recorded in place of the recording signal S _REC , the reproduction can be performed in a state where the ATF tracking control has been performed, whereby the recording current can be reduced in a state where the digital audio tape recorder is completely assembled. Can be adjusted.

Accordingly, the assembling operation can be simplified accordingly, and even when the rotary drum 20 is exchanged together with the magnetic heads 28A and 28B, the adjustment can be easily performed and the repairing operation can be simplified.

Clock signal extracting circuit hand 62, in the reproduction mode, the recording / reproducing amplifier circuit 32 extracts a reproduction clock signal from the reproduced signal S _RF which is obtained through the reproduced signal the reproduction clock signal with the reproduced signal S _RF Output to the processing circuit 58.

Reproduction signal processing circuit 58, based on the control data D _CONT, while stopping the recording operation, reproduction, after 10-8 demodulates the reproduced signal S _RF with respect to the reproduction clock signal, the resulting The reproduced data _DPB is output to the memory circuit 44.

The reproduced data D _PB thus demodulated is temporarily stored in the memory circuit 44, then error-corrected by the error detection and correction circuit 56, and sequentially output through the digital signal input / output circuit 52, whereby the magnetic tape 15 The recorded digital audio signal can be reproduced.

On the other hand, of the demodulated reproduced data _DPB , the sub-code data recorded in the sub-data area is temporarily stored in the memory circuit 44, and then error-corrected by the error detection and correction circuit 56 to input control data. The magnetic tape 15 is output to the system control circuit 6 via the output circuit 40 so that desired information can be detected as necessary and the magnetic tape 15 can be reproduced.

Thus, the recording current adjustment reference signal can be reproduced in the state where the ATF tracking control is performed according to the recording mode, and the recording current can be easily adjusted.

(G2) Operation of Embodiment In the above configuration, in the digital signal processing circuit 8, the memory interface circuit 42, the control data input / output circuit 40, the digital signal input / output circuit 52, the reproduction signal processing circuit 58, the recording signal generation circuit 60 And error detection and correction circuit 56
Loads the control data D _CONT stored in the memory circuit 44 at a predetermined timing.
_Switch the operation based on _CONT .

That is, during recording, the audio signal conversion circuit
After digital audio signal D _AU inputted through 30 are block of interleaved cycles, are converted into the input audio data is interleaved.

The input audio data is output to the recording signal generation circuit 60 in the subsequent interleave cycle after the parity code is created by the error detection and correction circuit 46, thereby
S _REC is converted is sequentially outputted to the magnetic head 28A and 28B, the thus can record digital audio signals on the magnetic tape 15.

In this case the recording signal generation circuit 60, in the normal recording mode, the predetermined pilot signal to the recording signal S _REC, whereas the output by adding a synchronization signal or the like, to a recording signal S _REC becomes test signal recording mode Instead, a predetermined pilot signal, a synchronizing signal, and the like are added to the recording current adjustment reference signal and output, so that the recording current adjustment reference signal can be reproduced by a normal reproduction operation to adjust the recording current.

(G3) Effects of Embodiment According to the above configuration, the reference signal generation circuits 74, 76, and 78 are provided in the recording signal generation circuit 60, and the reference signal generation circuit 74,
By recording the recording current adjustment reference signal output from 76 and 78 in place of a recording signal consisting of audio data and a modulation signal of the parity code thereof, the recording current can be easily recorded without connecting to a jig or the like. The adjustment reference signal can be recorded and reproduced, and thus the recording current can be easily adjusted.

(G4) Other Embodiments In the above-described embodiment, the case where the reference signal generation circuit is provided in the recording signal generation circuit has been described. However, the present invention is not limited to this, and may be provided separately from the recording signal generation circuit. It may be.

Further, in the above embodiment, the frequencies f _CH / 72, f _CH /
18, the case where the recording current adjustment reference signal of _fCH / 6, _fCH / 4, _fCH / 2 is recorded has been described. However, the present invention is not limited to this. An adjustment reference signal can be selected.

Further, in the above-described embodiment, the case where the present invention is applied to a digital audio tape recorder for recording and reproducing audio signals has been described. However, the present invention is not limited to this, and data may be recorded and reproduced as an external storage device of an arithmetic processing unit. It can be widely applied to data recorders and the like.

Further, the present invention can be widely applied not only to a magnetic recording / reproducing apparatus but also to a magnetic recording apparatus dedicated to recording.

H Effect of the Invention As described above, according to the present invention, based on control data output from the control means for adjusting the recording current flowing through the first and / or second magnetic head, the magnetic field is generated by the reference signal generating circuit. Of the recording current adjustment reference signals of different frequencies created in accordance with various signals recorded according to the scanning positions of the first and second magnetic heads on the recording track on the tape, the recording current adjustment corresponds to the adjustment of the recording current. A recording current adjustment reference signal is output, a recording signal including a recording current adjustment reference signal obtained from the reference signal generation circuit is output from the selection circuit instead of the output signal, and the recording signal is output by the recording current adjustment unit. While recording on the magnetic tape via the corresponding first and / or second magnetic heads, the recording signals recorded from the magnetic tape are transferred to the corresponding first and / or second magnetic heads. And the recording current flowing through the corresponding first and / or second magnetic head is adjusted based on the recording current adjustment reference signal included in the recording signal obtained by the reproduction. When recording various signals included in the recording current, the recording current flowing through the first and / or second magnetic heads can be easily adjusted, and thus the recording current flowing through the first and / or second magnetic heads can be adjusted. Adjustment can be greatly simplified.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a digital audio tape recorder according to an embodiment of the present invention, FIGS. 2 and 3 are tables showing control data, FIG. 4 is a block diagram showing a digital signal processing circuit, and FIG. The figure is a block diagram showing a recording signal generation circuit. 1 ... Digital audio tape recorder, 6 ... System control circuit, 15 ... Magnetic tape, 20 ... Rotary drum, 28A, 28B ... Magnetic head, 44 ... Memory circuit, 52 ...
... Digital signal input / output circuit, 56 ... Error detection and correction circuit, 58 ... Reproduction signal processing circuit, 60 ... Recording signal generation circuit, 72 ... Selection circuit, 74 ... ATF signal generation circuit, 76, 78
... Reference signal generation circuit.

Claims (1)

(57) [Claims] 1. A recording track on a magnetic tape by outputting a recording signal composed of various signals including an output signal corresponding to a digital signal to first and second magnetic heads on a rotating drum on which a magnetic tape is wound. The recording signal is recorded on the magnetic tape by recording the different signals in accordance with the scanning positions of the first and second magnetic heads, while the recording signal recorded on the magnetic tape is reproduced. Control means for outputting control data for adjusting a recording current flowing through the first and / or second magnetic head; and a first and a second control means for outputting the first and / or second magnetic head to the recording track on the magnetic tape. A recording current adjustment reference signal having a different frequency corresponding to each of the various signals recorded according to the scanning position of the second magnetic head is created, and A reference signal generation circuit for outputting a reference signal for the recording current adjustment corresponding based on the control data is, based on the control data obtained from the control means,
A selection circuit for outputting the recording signal including the recording current adjustment reference signal obtained from the reference signal generation circuit in place of the output signal; and a first circuit corresponding to the recording signal obtained from the selection circuit. And / or recording on the magnetic tape via the second magnetic head, and reproducing the recording signal recorded from the magnetic tape via the corresponding first and / or second magnetic head, and Recording current adjusting means for adjusting a recording current flowing through the corresponding first and / or second magnetic head based on the recording current adjustment reference signal included in the recording signal obtained as described above. Magnetic recording and reproducing apparatus.