JPH06180831A - Azimuth angle adjusting device - Google Patents

Abstract

PURPOSE:To always reproduce a tape in an optimum tone by always detecting the deviation in an azimuth angle for the angle between a magnetic tape and a head with a control circuit and correcting the deviation in the azimuth angle. CONSTITUTION:Data read by the first head H1 of a head unit 2 going a little to a first track T1 and the data read by the eighth head H8 of the head unit going a little to an eighth track T8 from eight pieces of tracks on the magnetic tape 1 are inputted to the control circuit 5. By the control circuit 5, these two pieces of data are compared to detect the deviation in the azimuth angle, and an angle adjusting device 6 for the head unit 2 is driven to adjust the angle of the head unit 2 when the deviation is detected. That is, with the read time differences of the signals to be read simultaneously recorded on respective tracks T1-T8 on the tape by respective heads H1-H8, or with the differences of the signals read by respective heads, the deviation in the azimuth angle is detected by the control circuit 5, and is controlled by the angle adjusting device 6 of the head according to the detected value.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tape recorder,
In particular, the present invention relates to an azimuth angle adjusting device that is effective in adjusting the azimuth angle of a head unit.

[0002]

2. Description of the Related Art One of the factors that determine the recording and reproducing quality of a tape recorder is the angle between the length of the tape and the head, which is called the azimuth angle. This angle is an appropriate angle (usually 90 degrees between the tape advancing direction and the head gap direction).
If it deviates from °), recording and playback quality will deteriorate. For this reason, many tape recorders are equipped with an azimuth angle adjusting device that corrects the deviation of the azimuth angle.

FIG. 7 is a front view showing a conventional azimuth angle adjusting device. The adjustment of the azimuth angle of the head unit 2 is usually performed at the time of assembling the product. When the magnetic tape 1 is reproduced, the output is maximized while observing the output waveform with an oscilloscope or the like. Rotate the screw 17 installed to rotate the spring 1
By adjusting the tilt angle of the head mount 18 elastically supported by 9, the angle 20 of the head unit 2 is changed to adjust the azimuth angle.

[0004]

However, even if the azimuth angle is adjusted at the time of assembling the product, there is a problem that the adjusted azimuth angle shifts due to a change with time. Also,
Even if you feel deterioration of the playback sound while playing the tape and you notice a deviation in the azimuth angle, you cannot make a reliable adjustment because a special adjustment device is required to adjust the azimuth angle, and it is also a special adjustment. Even if there was a device, there was a problem that it took time to manually adjust the azimuth angle. Further, when the deviation of the azimuth angle is not noticed, the reproduced sound is heard with the deteriorated sound quality, and when it is used for data recording, there is a problem that the data error increases.

Therefore, in view of the above problems, it is an object of the present invention to provide an azimuth angle adjusting device that automatically adjusts the azimuth angle to reduce reading errors and prevent sound quality deterioration. .

[0006]

DISCLOSURE OF THE INVENTION The present invention is to solve the above-mentioned problems, and reproduces data recorded on a plurality of tracks of a magnetic tape by a plurality of heads provided corresponding to the respective tracks. In the apparatus, comparing means for comparing the data read by at least two of the heads, the first head and the second head, and the comparison result of the comparing means moves the head supporting member supporting a plurality of heads to move the head azimuth. It is characterized by comprising an adjusting means for adjusting a corner.

The data to be compared is delimiter data indicating the delimiter of each data frame recorded at the same position in the tape traveling direction on each track, and the comparing means is the first head and the second head. The reading time of the read delimiter data is compared, and the azimuth angle adjusting means adjusts the azimuth angle based on the difference in the reading time of the delimiting data compared by the comparing means.

The data to be compared is synchronous data for synchronizing the data reading recorded at the same position in the tape traveling direction on each track, and the comparing means is the first head and the second head. The azimuth angle adjusting means compares the reading times of the synchronous data read by the step (1), and the azimuth angle adjusting means adjusts the azimuth angle based on the difference in the reading times of the synchronous data compared by the comparing means.

The data to be compared is address data for indicating the order of the data having the same value at the same position in the tape traveling direction in each track, and the comparing means is the first head and the second head. The read time of the same address data read in step 1 is compared, and the azimuth angle adjusting means adjusts the azimuth angle based on the read time difference of the address data compared by the comparing means.

The data to be compared is address data for indicating the order of the data having the same value at the same position in the tape traveling direction in each track, and the comparing means is the first head and the second head. The azimuth angle adjusting means adjusts the azimuth angle based on the difference in the address data compared by the comparing means.

In a magnetic tape reproducing apparatus for reading data recorded on a plurality of tracks of a magnetic tape by a plurality of heads provided corresponding to each track, at least two of the heads, a first head and a second head And a tape running path adjusting means for changing the running path of the magnetic tape and adjusting the angle between the head and the running direction of the magnetic tape according to the comparison result of the comparing means. It is characterized by.

[0012]

According to the azimuth angle adjusting device of the present invention, the comparison means compares the data read by the first head and the data read by the second head, and detects the deviation of the azimuth angle. That is, the larger the deviation between the two data, the larger the deviation amount of the azimuth angle. Therefore, the deviation of the azimuth angle can be detected from the comparison result. Based on the detection result, the adjusting means adjusts the deviation of the azimuth angle of the head.

Further, according to the azimuth angle adjusting device of the present invention, the comparing means determines the reading time at each head of the delimiter data indicating the delimiter of each data frame recorded at the same position in each tape in the tape traveling direction. The deviation of the azimuth angle is detected by the difference. Further, according to the azimuth angle adjusting device of the present invention, the comparison means uses the azimuth difference due to the difference in the read time at each head of the synchronization data indicating the synchronization of each data frame recorded at the same position in each tape in the tape traveling direction. Detects misalignment of corners.

Further, according to the azimuth angle adjusting device of the present invention, the comparing means detects the deviation of the azimuth angle based on the difference between the values of the address data of the magnetic tape read simultaneously by at least two heads. Further, according to the azimuth angle adjusting device of the present invention, the comparing means detects the deviation of the azimuth angle from the difference in reading time of the same address data of the magnetic tape read by at least two heads.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. An example of a tape recorder that records / reproduces digital signals on a magnetic tape with eight tracks by eight recording / reproducing heads will be described. First, the head structure and the data recording state of the magnetic tape will be described.

FIG. 2 is a detailed view showing the structure of the head. In the head unit 2, eight digital recording heads 7 corresponding to each track and a digital reproducing head 8 are arranged side by side in a direction perpendicular to the tape traveling direction, and the digital recording heads 7 are magnetic tapes. Digital signals are recorded on eight tracks, and the digital reproducing head 8 reads the digital signals recorded on the magnetic tape in eight tracks. Further, the analog reproducing heads 9 are arranged in two rows at a right angle to the tape traveling direction at intervals, and the analog reproducing heads 9 are arranged on the magnetic tape.
An analog signal is recorded on the tracks, and the analog signals recorded on the two tracks are read. Further, the head unit 2 is configured such that the azimuth angle is changed by a drive mechanism (not shown) such as a motor and a gear.

FIG. 3 is a detailed view showing the structure of the magnetic tape. The magnetic tape 1 has eight tracks indicated by T1 to T8, and data is recorded on each track in units called frames 11. This frame 11 is recorded at the same position with respect to the tape traveling direction for each track, and the frame 11 is further divided into a plurality of blocks, for example, 32 blocks, and at the head of the frame,
The same specific data (delimiter data) is recorded on each track indicating a frame delimiter, and the data is recorded on 32 data blocks following the data. This 32 × 8 data constitutes reproduction information for one frame. Further, each of the 31 data blocks is provided with a header 13 and a body 14, and the header 13 shows the same sync data 15 and the data order for each track and each block for synchronizing the data reading. Address data 16 including a frame number and a block number for recording is recorded, and data to be actually recorded is recorded in the body 14. That is, the delimiter data 12 and the synchronization data 15 are data that should be read simultaneously by each head, and are at the same position in the tape traveling direction. Address data 1
With respect to No. 6, data having the same address value is data to be read by each head at the same time, and is at the same position in the tape traveling direction.

Next, the structure of an embodiment of the present invention will be described.
FIG. 1 is a block diagram showing an embodiment of the present invention. From the eight tracks of the magnetic tape 1, the data read by the first head H1 of the head unit 2 from the first track T1 and the data read by the eighth head H8 of the head unit 2 from the eighth track T8. Data is input to the control circuit 5. The control circuit 5 compares the two data to detect the deviation of the azimuth angle. When the deviation of the azimuth angle is detected, the angle adjusting device 6 of the head unit 2 is driven to adjust the angle of the head unit 2. adjust. That is, the control circuit 5 detects the deviation of the azimuth angle due to the difference in the reading time of each head of the signals to be read simultaneously recorded on each track of the tape, or the difference of the signals (data) read simultaneously by each head, and The head angle adjusting device is controlled according to the detection.

FIG. 4 is a flow chart showing an example of processing performed by the control circuit 5, and shows processing when the angle adjusting device 6 of the head unit 2 is composed of a motor. In step S1, the address data (A1, A8) is read by the heads H1, H8 and the process proceeds to step S2. In step S2, it is determined whether the frame number and the block number included in the address data A1 and A8 are the same. If they are the same, it can be determined that there is no deviation in the azimuth angle. Therefore, the process returns to step S1. If it is determined that there is such an item, the process proceeds to step S3. In step S3, it is determined which of the frame number and the block number included in the address data A1 and A8 is larger. If the address data A1 is larger, the process proceeds to step S4.
If the address data A8 is larger, the process proceeds to step S7. That is, it is determined which of the head H1 and the head H8 first reads the same address data. When the head H1 first reads the same address data, the process proceeds to step S4, and the head H8 first reads the same address data. When reading, the process proceeds to step S7. In step S4, the address data read time of the head H1 is used as a reference until the same address data as that of the head H8 is read.
The delay time t is measured and the process proceeds to step S5. Step S
In step 5, the driving time F (t) of the azimuth angle adjusting motor of the head angle adjusting device 6 is calculated from the delay time t, and the process proceeds to step S6. Where motor drive time F (t) is delay time
The larger t is, the larger it becomes. In step S6, a command to drive the azimuth angle adjustment motor for F (t) time is issued, and the azimuth angle adjustment motor is driven in the direction to shorten the data reading time of the head H8 to adjust the azimuth angle deviation. Return to S1. If the head H8 first reads the same address data in step S3, the process proceeds to step S7. In step S7, a delay time t until the same address data as that of the head H1 is read based on the address data read time of the head H8.
Is measured and the process proceeds to step S8. In step S8, the drive time F (t) of the azimuth angle adjusting motor of the head angle adjusting device 6 is calculated from the delay time t, and the process proceeds to step S9. In step S9, set the azimuth angle adjustment motor to F
(t) A command to drive for a time is issued, the azimuth angle adjusting motor is driven in a direction to shorten the data reading time of the head H1, the deviation of the azimuth angle is adjusted, and the process returns to step S1. In this embodiment, the head H having the same address data
Although the azimuth angle is adjusted by the reading time difference between H1 and H8, the azimuth angle can be adjusted by the difference between the frame number and the block number included in the address data (A1, A8) read simultaneously by the heads H1 and H8. The heads to be compared are not limited to H1 and H8, and any combination of heads is possible. Also, from step S4
Instead of S6 and steps S7 to S9, it may be a step of driving the adjusting motor for a fixed time in the direction of shortening the reading time of the head H1 and the head H8, respectively. The same applies to the examples described below.

FIG. 5 is a flow chart showing an example of the processing performed by the control circuit 5 in another embodiment, which is configured to adjust the deviation of the azimuth angle of the heads by the difference in the division data reading time by each head. In step P1, the delimiter data (specific data) read by the heads H1 and H8
Is measured and the process proceeds to step P2. In step P2, it is determined which of the head H1 and the head H8 first reads the same delimiter data, and the head H
When 1 reads the delimited data first, the process proceeds to step P3, and when the head H8 reads the delimited data first, the process proceeds to step P6. In step P3, the heads H1 and H8
Calculate the reading time difference t of the delimited data in step P
At 4, the delay time t of the head H8 is calculated with reference to the delimited data reading time of the head H1.
From this, the drive time F (t) of the azimuth angle adjusting motor of the head angle adjusting device 6 is calculated, and the routine proceeds to step P5. In Step P5, a command to drive the azimuth angle adjusting motor for F (t) time is issued, and the azimuth angle adjusting motor is driven in the direction to shorten the data reading time of the head H8 to adjust the azimuth angle deviation. Return to P1. In step P6, the read time difference t of the delimiter data between the heads H1 and H8.
In step P7, the delay time t of the head H1 is calculated based on the delimiter data reading time of the head H8, and the azimuth angle adjusting motor of the head unit angle adjusting device 6 is driven from this delay time t. The time F (t) is calculated and the process proceeds to step P8. In Step P8, a command to drive the azimuth angle adjustment motor for F (t) time is issued, and the head H1
The motor for azimuth angle adjustment is driven in the direction of shortening the data reading time to adjust the deviation of the azimuth angle, and the process returns to step P1.

Further, in the flow chart using the delimited data, the same effect can be obtained even if control is performed by the difference in the reading time of the synchronous data by each head instead of the delimited data.
FIG. 6 shows an embodiment in which a circuit is used instead of the program processing in the embodiment of FIG. Magnetic tape 1 of 8
The data read by the head H1 which is the first from the first track among the tracks of the book is sequentially separated by the delimiter signal detection circuit 3
0 to the shift register 22. The shift register 22 shifts the data of the clock 21 in synchronization with the clock and fetches the data read by the head.
The delimiter data is recorded in the memory 23, and the value of the shift register is compared with the bit by bit in the EXCLUSIVEOR circuit 28. That is, when the delimiter data is input, the values in the shift register and the memory 23 match,
The outputs of the EXCLUSIVE OR circuits 28 are all at the L level, and the outputs of the NOR circuit 29 are at the H level.
The latch / hold circuit 25 is a free-running counter that counts up with the clock of the clock circuit 24, and outputs the value when the output of the NOR circuit 29 becomes H level to the digital-analog conversion circuit 26. The division signal detection circuit 31 also has the same configuration as the division signal detection circuit 30, a voltage is input to the differential amplifier 27 according to the detection time of the division signal, and the differential amplifier 27 divides the heads H1 and H8. A voltage signal corresponding to the data reading time difference is output.
Then, the signal of this differential amplifier 27 drives the head angle adjusting device 6 to adjust the azimuth angle. still,
If the recording data in the memory 23 is synchronized data, the azimuth angle can be adjusted according to the difference in the reading time of the synchronized data by the head unit 2.

In place of the adjusting device for moving the head unit itself to adjust the azimuth angle, a member for guiding the magnetic tape, such as a capstan, which defines the running path of the magnetic tape is driven to change the running path of the magnetic tape. Therefore, the azimuth angle can also be adjusted by using the tape running path adjusting means for adjusting the angle formed by the head and the running direction of the magnetic tape. Further, in the above embodiment, the tape recorder has been described as an example, but it may be applied to a reproducing apparatus having no recording function.

[0023]

As described above, according to the present invention, with respect to the angle between the magnetic tape and the head, the deviation of the azimuth angle is always detected by the control circuit and the deviation of the azimuth angle is corrected. It can be played with optimum sound quality. Also,
Even for a tape recorded by a certain recording head, the deviation of the azimuth angle has the effect of adjusting the azimuth angle so as to absorb the deviation.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention.

FIG. 2 is a detailed view showing the structure of the head.

FIG. 3 is a detailed view showing the structure of a magnetic tape.

FIG. 4 is a flowchart showing an embodiment of the present invention.

FIG. 5 is a flowchart showing an example of the present invention.

FIG. 6 is a circuit diagram showing an embodiment of the present invention.

FIG. 7 is a front view showing an azimuth angle adjusting device.

[Explanation of symbols]

 1 magnetic tape 2 head unit 5 control circuit 6 head unit angle adjusting device 7 digital recording head 8 digital reproducing head 9 analog reproducing head 10 track 11 frame 12 delimited data (IFG) 13 header 14 body 15 sync data 16 address Data 17 Screw 18 Loading platform 19 Spring 20 Head angle 21, 24 Clock circuit 22 Shift register 23 Memory 25 Latch / hold circuit 26 Digital-analog conversion circuit 27 Differential amplifier 28 EXCLUSIVE OR circuit 29 NOR circuit 30, 31 Separation signal detection circuit

Claims (6)

[Claims] 1. A magnetic tape reproducing apparatus for reading data recorded on a plurality of tracks of a magnetic tape by a plurality of heads provided corresponding to each track, wherein at least two of the heads, first and second, are provided. Comparing means for comparing the data read by the head, and adjusting means for adjusting the azimuth angle of the head by moving the head supporting member supporting the plurality of heads according to the comparison result of the comparing means. Azimuth angle adjustment device. 2. The data to be compared is delimiter data indicating a delimiter of each data frame recorded at the same position in the tape traveling direction in each track, and the comparing means is a first head, 2. The reading time of the delimiter data read by the second head is compared, and the azimuth angle adjusting means adjusts the azimuth angle by the difference in the reading time of the delimiter data compared by the comparing means. Azimuth angle adjusting device according to 1. 3. The data to be compared is synchronization data for synchronizing data reading recorded at the same position in the tape traveling direction on each track, and the comparison means is a first head, The read time of the synchronous data read by the second head is compared, and the azimuth angle adjusting means adjusts the azimuth angle based on the difference in the read time of the synchronous data compared by the comparing means. Item 1. An azimuth angle adjusting device according to item 1. 4. The data to be compared is address data for indicating the order of data having the same value at the same position in the tape traveling direction in each track, and the comparing means is a first head, The read time of the same address data read by the second head is compared, and the azimuth angle adjusting means adjusts the azimuth angle by the read time difference of the address data compared by the comparing means. The azimuth angle adjusting device according to claim 1. 5. The data to be compared is address data for indicating the order of data having the same value at the same position in the tape traveling direction in each track, and the comparing means is a first head, The second head compares the differences of the address data read at the same time, and the azimuth angle adjusting means adjusts the azimuth angle by the difference of the address data compared by the comparing means. Azimuth angle adjustment device. 6. A magnetic tape reproducing apparatus for reading data recorded on a plurality of tracks of a magnetic tape by a plurality of heads provided corresponding to each track, wherein at least two of the heads, first and second, are provided. Comparing means for comparing the data read by the head and the comparison result of the comparing means, the traveling path of the magnetic tape is changed,
An azimuth angle adjusting device comprising the head and a tape running path adjusting means for adjusting an angle formed by the magnetic tape running direction.