JPH07121942A - Information reproducing apparatus - Google Patents

Abstract

PURPOSE:To obtain an information reproducing apparatus in which an irregularity in the gain of tracking control system is suppressed. CONSTITUTION:The amplitude of a tracking pilot signal which is contained in a reproduced signal from a head 2b is detected by a pilot-level detection part 15, and a level detection signal 106 is output. A tracking part 7 operates a tape drive part 7 on the basis of a tracking error signal 104 formed from a tracking pilot signal which is contained in a reproduced signal from a head 2a, and a tracking operation is controlled. A gain adjustment part 12 adjusts a tracking gain according to the level detection signal 106.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information reproducing apparatus for reproducing information such as images, sounds and data from a tape medium.

[0002]

2. Description of the Related Art In a reproducing apparatus for reproducing an information signal recorded as an oblique track on a tape, such as a video tape recorder, a rotary scan is usually performed by a rotary head. At that time, in order to obtain the reproduced signal correctly,
Tracking control is required to control the scanning position so that the head traces each track accurately. An ATF (Automatic track finding) method is known as one method for this purpose. For example, Japanese Patent Laid-Open No. 4-285746 discloses an example of a reproducing apparatus in which two kinds of tracking pilot signals having different frequencies are frequency-multiplexed with a data signal and recorded on a track on a tape, and the tracking pilot signal is used for tracking control. It is shown.

[0003]

In such an information reproducing apparatus, the reproduction signal level fluctuates due to variations in recording / reproducing characteristics of the tape, recording current during recording, head and circuit characteristics. Therefore, an AGC circuit is often provided in the reproducing circuit to suppress the level fluctuation. By the way, it is the high frequency component mainly containing the information signal that suppresses the fluctuation due to the AGC, and for the relatively low frequency and small amplitude component where the tracking pilot signal exists, the effect of the AGC is due to the variation in the frequency characteristics. Can not be expected. Therefore, the level of the pilot signal fluctuates even in the system having such an AGC, and the tracking control gain fluctuates accordingly. For this reason, it is necessary to design the control system with a margin so that stability can be ensured even in consideration of variations, and there are problems that it is difficult to perform optimal design, and the degree of freedom in control system design is impaired.

Further, in the information reproducing apparatus by the helical scan, there are cases where the tracking position is adjusted, that is, the control position is adjusted by adding an offset to the tracking error signal. However, in the above-mentioned system in which tracking control is performed by the tracking pilot signal, there is a problem in that the added offset and the amount of positional deviation actually generated do not correspond to each other because the gain varies, and accurate position adjustment cannot be performed. .

In view of the above problems, the present invention provides an information reproducing apparatus which detects a tracking detection gain by adding a simple element to a conventional tracking control system and suppresses the gain variation based on the detected gain. Has an aim.

[0006]

In order to solve the above-mentioned problems, the information reproducing apparatus of the present invention cyclically records two or more kinds of tracking pilot signals of different frequencies in a cycle of four tracks or more selectively. An information reproducing apparatus for reproducing a signal by rotationally scanning a head mounted on a rotating cylinder with respect to a tape medium, comprising tape driving means for driving and driving the tape, and a first head,
A second head which scans a position displaced from the scanning locus of the first head by approximately one track in the track width direction;
Tracking error detection means for detecting the amplitude of the tracking pilot signal included in the reproduction signal of the head and outputting the tracking error signal based on the detected amplitude, and the tape driving means based on the tracking error signal to operate the tracking control signal. Tracking means for detecting the amplitude of the tracking pilot signal included in the reproduction signal of the second head and outputting a level detection signal corresponding to the amplitude, and a tracking error from the first head. A gain adjusting means is provided between any one of the detecting means, the tracking means, and the tape driving means and adjusts the gain according to the level detection signal.

Further, the present invention relates to a tape medium on which tracking pilot signals of two or more different frequencies are selectively recorded cyclically in a cycle of four tracks or more,
An information reproducing apparatus for reproducing a signal by rotationally scanning a head mounted on a rotary cylinder, comprising tape driving means for driving and driving the tape, a first head, and a scanning locus of the first head. A second head that scans the first head in a time-divisional manner at a position displaced by approximately one track in the track width direction, and the amplitudes of the tracking pilot signals included in the reproduction signals of the first and second heads are detected. And a tracking error detecting means for outputting a tracking error signal based on the tracking error signal, and a tracking means for operating the tape driving means based on the tracking error signal obtained during the scanning period of the first head to perform tracking control. And included in the reproduction signal of the second head based on the tracking error signal obtained during the scanning period of the second head. And a level detecting means for detecting the amplitude of the tracking pilot signal and outputting a level detection signal corresponding to the detected amplitude, and any one of the first head, the tracking error detecting means, the tracking means, and the tape driving means. The gain adjusting means adjusts the gain according to the level detection signal.

Further, the tracking means is such that the tape drive means is operated based on the tracking error signal obtained during the scanning period of the first head, and tracking control is performed with a predetermined amount of offset.

[0009]

The present invention has the above-mentioned structure and has the first head,
For the tracking control means including the tracking error detection means, the tracking means, and the tape drive means, the amplitude of the tracking pilot signal included in the reproduction signal from the second head is detected, and based on this, the tracking control is performed. Since the gain of the system can be adjusted, it is possible to suppress the gain variation of the tracking control system.

[0010]

Embodiments of the information reproducing apparatus of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of the information reproducing apparatus of the present invention. In FIG. 1, 1 is a magnetic tape (tape), 2a and 2b are magnetic heads having different azimuths, 3 is a cylinder, 4 is a cylinder controller, 5 is a tracking error detector, 6 is a tracking unit, and 7 is a tracking unit. Is a tape drive unit, 15 is a pilot level detection unit, and 12 is a gain adjustment unit. The tracking control operation of the information reproducing apparatus thus configured will be described with reference to FIG.
This will be described with reference to FIG.

FIG. 2 schematically shows a track pattern recorded on the tape 1. The symbols "f1" and "f2" shown in each diagonal track indicate the type of the tracking pilot signal recorded in the data superposed on the track. That is, the first tracking pilot signal (f1) and the second tracking pilot signal (f2) having a frequency different from the first tracking pilot signal are alternately recorded every other track. Further, "-" indicates that the tracking pilot signal is not recorded. Further, the track on which no pilot signal is recorded has the same azimuth angle as the head 2a, and the track on which the pilot signals f1 and f2 are recorded has the same azimuth angle as the head 2b.

Tape 1 having tracks formed in this way
Is wound around the cylinder 3 for a period of about 180 degrees, sandwiched between the capstan 10 and the pinch roller 11, and runs in the longitudinal direction thereof. Cylinder 3 is cylinder control unit 4
The rotation is controlled to a predetermined rotation speed by. The rotation speed of the capstan motor 9 directly connected to the capstan is controlled by the capstan control unit 8 so that the tape 1 advances by one track during the half rotation period of the cylinder 3. Further, the heads 2a and 2b are attached at 180 ° opposite positions as shown in FIG. 1, and the tape 1 is scanned as the cylinder 3 rotates. With this configuration, each head scans at positions deviated from each other by one track, as shown in FIG. 2, for example. The cylinder controller 4 also detects the rotation phase of the cylinder and outputs a binary head switch signal 23 for identifying the head that is in contact with the tape 1. The head switch signal indicates a period in which the head 2a is in contact with the tape when the level is high and the head 2b is in contact with the tape when the level is low.

The reproduced signal 102 from the head 2a is input to the tracking error detector 5 through the multiplier 13. The operation of the multiplier 13 will be described later. Figure 3 (a)
Shows the amplitude of each of the tracking pilot signals f1 and f2 included in the reproduced signal when the scanning position of the head is taken on the horizontal axis. The broken line indicates the track boundary, and the type of recorded tracking pilot signal is shown on the upper part.

In the tracking error detection section 5, the f1 and f2 components contained in the reproduced signal 102 are extracted by the band pass filters 22 and 24, respectively, and the amplitude thereof is detected by the detector 2.
3 and 25, and the difference (f1 component amplitude−f2 component amplitude) is obtained by the subtractor 26. This is output as the tracking error signal 104. Tracking error signal 1
04 has the detection characteristic as shown in FIG. That is, when the head is located at the center of the track where the pilot is not recorded, the tracking error signal becomes zero. Therefore, the tracking control is realized by adjusting the tape feed so that the tracking error signal obtained from the reproduction signal of the head 2a becomes 0 (or a predetermined value), and each head sequentially reproduces the track in which the azimuth is matched. be able to.

The tracking unit 6 performs necessary processing on the tracking error signal 104 in order to perform tracking control. First, as is clear from the track pattern of FIG. 2, the tracking pilot arrangements of adjacent tracks are switched every time the head 2a scans, so that the polarities of the tracking error signals are inverted like the scanning positions a1 and a2 shown in FIG. . In other words, even if the head scans a1 and a2 are displaced in the same direction with respect to the track, the polarities of the tracking error signals obtained are opposite between the scans a1 and a2.
Therefore, in order to keep the control polarity constant, it is necessary to invert (switch between inversion and non-inversion) the polarity of the tracking error signal input for each scan of the head 2a. This operation is realized by selecting the signals before and after the inverting circuit 27 with the switch 28. Switching of the switches is performed by a signal obtained by passing the head switch signal 108 through the 1/2 frequency divider 32. The output of the 1/2 frequency divider 32 becomes a binary signal whose level is inverted every one cylinder rotation. When the tracking position adjustment is necessary, the adder 29 adds the offset value from the voltage source 30 here. If the position adjustment is unnecessary, the adder 29 and the voltage source 30 may be omitted. Further, the compensator 31 compensates the frequency characteristic as necessary, and outputs the error signal 105.

The capstan control unit 7 adjusts the rotation speed of the capstan motor 9 according to the error signal 105 given from the tracking unit. As a result, tracking control is performed so that each head scans the tracks one after another.

Next, the gain adjusting operation will be described.
The reproduced signal 101 from the head 2b is input to the pilot level detector 15. When the gain fluctuates due to the variation of each part, each pilot level in the reproduced signal shown in FIG. 3A fluctuates. The head 2b scans the tracks on which the pilot signals of f1 and f2 are recorded (head scans b1 and b2 in the lower part of FIG. 3). Therefore, a pilot signal corresponding to the peak of each component of f1 and f2 in FIG. 3A is mixed in the reproduced signal. Although the azimuth angles are different between the heads 2a and 2b, the tracking pilot signal is usually set to a low frequency where the loss due to this azimuth has little effect. Assuming that the other parameters of the heads 2a and 2b are sufficiently aligned, the pilot signal amplitude is the detection sensitivity of the tracking error signal detected from the reproduction signal of the head 2a (the detection characteristic of FIG. 3B). The slope is near the zero cross). Therefore, by detecting the pilot signal amplitude in the reproduction signal of the head 2b,
By adjusting the tracking gain accordingly,
The variation can be suppressed. The pilot level detecting unit 15 uses the center frequency f1 as shown in FIG.
The f1 component detection by the bandpass filter 16 and the detector 17, the bandpass filter 18 of the center frequency f2 and the f2 component detection by the detector 19, and the adder 20 that adds the f1 component and the f2 component. Of course, the configuration is not limited to this, and for example, only f1 or f2 may be detected. The detected value is sent to the gain adjusting unit 12 as the level detection signal 106.

In this example, the gain adjusting section 12 is interposed between the head 2a and the tracking error detecting section 5 and adjusts the gain according to the level detection signal 106.
The arithmetic circuit 21 obtains a value proportional to the reciprocal of the level detection signal 106. That is, assuming that the peak level of the pilot signal indicated by the level detection signal is x and the peak level at an appropriate gain is n, an appropriate gain can be obtained by adjusting the gain of n / x. Further, if necessary, the band is limited by the filter 14 and input to the multiplier 13.
Thereby, the tracking gain is adjusted to be constant, and the offset amount and the tracking position can be accurately associated with each other.

As described above, according to this embodiment, the reproduction signal from the head (2b) which scans a position shifted by one track from the head (2a) which supplies the reproduction signal to the tracking error detector is used. Since the amplitude of the tracking pilot signal included in the reproduced signal is detected and the gain of the tracking control system is adjusted according to the detected amplitude, it is possible to suppress variations in the tracking gain due to variations in tape characteristics and circuits.

Further, in this system, the tracking position can be accurately adjusted by adding an offset in the tracking section.

Next, another embodiment of the present invention will be described. FIG. 4 is a block diagram of the second embodiment of the information reproducing apparatus of the present invention. In this embodiment, attention is paid to the elements that can be shared in the previous embodiment, and the configuration is simplified as much as possible. Further, it corresponds to an insert editing operation for rewriting only a part of the tape in the longitudinal direction, and more specifically, only a specific area in each track. The tape 1, the heads 2a and 2b, the cylinder 3, the cylinder control unit 4, and the tape drive unit 7 shown in FIG. 1 are the same in this embodiment, and therefore the description thereof is omitted in FIG. Further, 50 is a recording signal generator, 51, 52 and 54 are switches, a broken line portion 40 is a level detector, and 53 is a timing pulse generator.
Further, the signs "H" and "L" of the intercepts written on the switches 51, 52 and 54 correspond to the high and low levels of the switching signal. The operation will be described below with reference to FIGS.

The reproduced signals 102 from the heads 2a and 2b,
101 is time-divisionally combined by the switch 51. The switch 51 operates by the head switch signal 108 so as to select the signal from the head which is constantly scanning the tape. Subsequently, the reproduction signal that has passed through the switch 52 passes through the multiplier 13 of the gain adjustment unit 12 and is input to the tracking error detection unit 5. The switch 52 is assumed to be fixed in the state shown here. The configuration of the tracking error detector 5 is the same as that of the example of FIG. 1, but the head 1a and the head 2 are used as inputs in accordance with the rotation of the cylinder 3.
The reproduction signal from b is alternately input. In the scanning period of the head 2a, a tracking error signal similar to the example of FIG. 1 is obtained. On the other hand, in the scanning period of the head 2b, as can be seen from FIG. 3B, the component of f2 can be almost ignored in the f1 track, so that a positive peak of f1 track, f
On the other hand, in 2 tracks, the component of f1 is hardly detected, so that a negative peak is detected. These peaks have information corresponding to the level detection signal according to the first embodiment shown in FIG. 1 except that the positive / negative change. Therefore, the tracking control and the gain adjustment are realized by dividing the output of the tracking error detector 5 into the respective scanning periods and using the output.

First, in the tracking section, the sample and hold circuit 59 samples and holds the tracking error signal 104 during the scanning period of the head 2a. The sample pulse of the sample hold circuit 59 is supplied from the timing pulse generator 53 via the switch 54. The timing pulse generator 53 outputs the sample pulse 111 at an appropriate timing within each scan in synchronization with the head switch signal 108. Figure 6 shows the situation,
(A) is the head switch signal 108, and (b) is the sample pulse 111. The sample pulse 111 is distributed to each head scanning period by the switch 54 which operates by the head switch signal 108, and the sample pulse is supplied to the two sample hold circuits 55 and 59. After the sample hold, the configuration is the same as that of the previous embodiment. The polarity is inverted, the offset is added by the adder 29 as necessary, and the compensation is performed by the compensator 31.
The error signal 105 is supplied to the tape drive unit 7.

On the other hand, the sample hold circuit 55 of the level detector 40 samples and holds the tracking error signal 104 during the scanning period of the head 2b. The sample pulse is also supplied from the timing pulse generator 53 via the switch 54. Next, the absolute value circuit 56 takes an absolute value and outputs it as a level detection signal 106 to the gain adjusting unit 12. The gain adjustment unit 12 adjusts the reproduction signal level given to the tracking error detection unit according to the level detection signal 106. The configuration of the present embodiment is different from the first embodiment shown in FIG. 1 in that the gain adjustment system is a closed loop. The level detection signal 106 is compared with the reference value provided by the voltage source 58 in the subtractor 57. The obtained difference is given to the multiplier 13 through the filter 60 to adjust the gain.

As described above, in this configuration, the reproduction signals from the heads 2a and 2b are input to the tracking error detector in a time division manner, and the tracking error signal is used in a time division manner, thereby omitting the pilot level detector in FIG. The same effect is realized with a simpler configuration.

Next, an example of performing insert editing will be described. First, the track structure will be described in more detail. FIG. 5 is a diagram showing the internal structure of each track on the tape 1. In this example, the inside of the track is largely divided into three regions 80, 81, with an editing gap (hatching part) in between.
It is divided into 82. For example, audio signals and video signals are recorded in the areas 81 and 82, respectively. In the area 80, a plurality of small blocks including at least a sync pattern and a sync block number are recorded so that the reproduction timing can be detected during reproduction. A tracking pilot signal is selectively recorded over the entire track in accordance with the sequence shown in FIG.

The timing pulse generator 53 detects the timing of reproducing the area 80 from the reproduction signal that has passed through the switch 52 during insert editing, and outputs the sample pulse 111 based on this timing. This may be performed by input 113 (supplied from a system controller (not shown) or the like) by switching between normal reproduction and operation. The specific timing is area 8
A sample pulse is output near the end of 0.
This is because the band-pass filters 22 and 24 of the tracking error detector 5 (usually set to high Q) can be sufficiently settled during reproduction of the area 80. At the same time, based on the detected reproduction timing of the area 80, the recording timing signal 112 indicating the timing corresponding to the area to be inserted (for example, the area 82) is also output. An example of the waveform of the recording timing signal 112 is shown in FIG. The recording timing signal 112 is supplied to the switch 52. The switch 52 selects the recording signal generator 50 side and supplies the recording signal 110 to each head when the recording timing signal 112 is at a high level. At the low level, the operation is as described above and the reproduction state is set. That is, at least the period for scanning the area 80 from the start of head scanning is in the reproducing state, during which the sample pulse is issued and the tracking control and the gain adjustment are performed as described above. During the period in which the head scans the area to be inserted, in this case, the area 82, the switch 52 is switched to the recording side and recording is performed.

By performing such an operation, the following effects can be obtained. FIG. 7 is a diagram schematically showing the track pattern on the tape after the insertion.
Here, it is assumed that a wide head, that is, a head having a recording width wider than the track width (track pitch) is used. (A) shows the case where the tracking part is inserted while the tracking control is performed so that the track and the center of the scanning head coincide with each other without adding an offset in the tracking part.
(B) shows a case where a certain offset is added and the track and the center of the head are offset from each other for insertion. In (a), the track before insertion and the track after insertion are displaced. However, in (b), as a result of adding an offset by a wide width, that is, (head width-track width) / 2, the track centers are aligned before and after the insertion. Therefore, when reproducing the tape to which the insert edit is applied, the reproduction level of the tape edited by the method (a) is likely to be partially lowered, whereas the margin is secured in the tape (b) as much as before the insertion. . According to this embodiment, by keeping the tracking gain constant,
Since the correspondence between the applied offset and the actual tracking deviation can be accurately determined, it is possible to quantitatively shift the tracking position as in this example, and the editing accuracy can be improved.

The above description is for the case of insert editing, but the same can be applied to the case of so-called assemble editing, in which the recording is simply connected to the previous recording. That is, while running for the pre-roll period, tracking is performed in a state of being offset by a wide range and recording is started from that state. This prevents the track from becoming thin at the joint position,
The track pitch can be made uniform.

As described above, according to this embodiment, the reproduction signals from the heads 2a and 2b are input to the tracking error detector in a time division manner, and the tracking error signal is used in a time division manner to detect the pilot level in FIG. By omitting the parts, the effect of suppressing the gain variation due to the characteristic variation of the tape, head, circuit, etc. is realized with a simple configuration.

Further, the tracking position can be accurately shifted by adding an offset in the tracking section after suppressing the gain variation. Therefore, it also has the effect of improving the editing accuracy.

FIG. 8 shows the configuration shown in the embodiment of FIG.
FIG. 7 is a configuration diagram when the insertion position of the gain adjusting unit 12 is changed. In the embodiment of FIG. 4, a closed loop for gain adjustment by the tracking error detection unit 5, the level detection unit 40, and the gain adjustment unit 12 is formed for the reproduction signal from the head 2b, and at the same time regarding the reproduction signal from the head 2a. Although the gain adjustment was performed, the open loop configuration is used in FIG. That is, the reproduction signal 121 that has passed through the switch 52.
Is directly input to the tracking error detector 5. The detected tracking error signal 120 is supplied to the level detection unit 40, and the level detection signal 106 is obtained. The level detection signal 106 is given to the gain adjusting section 12, and the gain of the tracking error signal 120 is adjusted by the multiplier 13. The arithmetic circuit 71 of the gain adjusting unit 12 may be configured similarly to the arithmetic circuit 21 of FIG. Other configurations may be the same as in FIG. Even with such a configuration, it is possible to obtain the same effect as that of the embodiment of FIG.

The above embodiment is merely an example of the present invention. Regarding the arrangement of tracking pilots, an example in which two types of pilot signals are alternately arranged every other track has been shown, but the present invention is not limited to this. For example, when four types of pilot signals are sequentially arranged over four tracks. Can also be applied to.

The head arrangement on the cylinder is not limited to two heads. The present invention can be similarly applied if there are two heads that scan the tape by shifting one track from each other. The arrangement need not be 180 degrees apart. In addition to these, a head may be mounted.

The tracking error detecting means is not limited to the configuration shown in the embodiment as long as it can obtain the tracking error based on the amplitude of the tracking pilot signal included in the reproduction signal.

Although the gain adjusting means is inserted before the tracking error detecting means, the gain adjusting means is only required to be able to adjust the gain of the tracking control system, and its inserting position is not particularly limited. That is, it may be on the path from the first head output to the tape drive means. However, when the offset is added, it is necessary to place the gain adjusting means on the head side of the addition point.

Further, in the embodiment, an example in which the hardware is used is shown, but an equivalent function may be realized by software on a microprocessor. In particular, the gain adjusting means, the tracking means, the level detecting means and the like can be easily realized by software, and the effects of improving reliability and cost can be expected by reducing the number of elements and digitizing.

[0039]

As described above, in the information reproducing apparatus of the present invention, a tape medium on which two or more kinds of tracking pilot signals of different frequencies are selectively recorded cyclically in a cycle of four tracks or more, An information reproducing apparatus for reproducing a signal by rotationally scanning a head mounted on a rotary cylinder, comprising tape driving means for driving and driving the tape, a first head, and a scanning locus of the first head. The amplitude of the tracking pilot signal included in the reproduction signal of the second head and the second head that scans at a position displaced by approximately one track in the track width direction is detected, and a tracking error signal based on this is output. Tracking error detection means and tracking for operating the tape drive means based on the tracking error signal to perform tracking control A step, a pilot level detecting means for detecting the amplitude of the tracking pilot signal contained in the reproduction signal of the second head, and outputting a level detection signal corresponding to the amplitude, a tracking error detecting means for the first head, Since it is provided between any of the tracking means and the tape driving means and has a gain adjusting means for adjusting the gain in accordance with the level detection signal, it is substantially a head for supplying a reproduction signal to the tracking error detecting means. The reproduction signal from the head that scans the position shifted by one track is used to detect the amplitude of the tracking pilot signal contained therein, and the gain of the tracking control system is adjusted according to this, so that there are variations in tape characteristics and circuits. The variation of tracking gain due to According can to improve the performance.

Furthermore, by performing tracking control with a predetermined amount of offset in the tracking means, it is possible to accurately shift the tracking position. By applying this to the editing operation, the editing accuracy can be improved and the playback quality after editing can be improved.

In addition, cyclically, 2 with a cycle of 4 tracks or more.
An information reproducing apparatus for reproducing a signal by rotationally scanning a head mounted on a rotary cylinder to a tape medium on which tracking pilot signals of different frequencies or more are selectively recorded, wherein the tape is A tape drive means for running and driving, a first head, and a second head for time-divisionally scanning with the first head at a position deviated from the scanning locus of the first head by approximately one track in the track width direction. , A tracking error detecting means for detecting an amplitude of a tracking pilot signal included in the reproduction signals of the first and second heads and outputting a tracking error signal based on the amplitude, and a tracking error detecting means for obtaining a tracking error signal during the scanning period of the first head. Tracking means for operating the tape drive means based on the tracking error signal to perform tracking control; Level detecting means for detecting the amplitude of the tracking pilot signal included in the reproduction signal of the second head based on the tracking error signal obtained during the scanning period of the head and outputting a level detection signal corresponding to the amplitude; The tracking error detecting means is provided between any one of the head, the tracking error detecting means, the tracking means, and the tape driving means, and the gain adjusting means adjusts the gain according to the level detection signal. The reproduction signals from the first and second heads are input in a time division manner and the tracking error signal is used in a time division manner to simplify the detection of the pilot signal amplitude,
The effect of suppressing the gain variation due to the variation of the characteristics of the tape, head, circuit, etc. can be realized with a simple configuration.
Therefore, it is possible to improve the stability of the tracking control and to improve the performance by the optimum design while suppressing the cost increase to the minimum.

Further, by performing tracking control with a predetermined amount of offset in the tracking means, it is possible to suppress gain variation and shift the tracking position accurately with a simple structure. By applying this to the editing operation, the editing accuracy can be improved and the playback quality after editing can be improved.

As described above, the present invention provides an information reproducing apparatus excellent in tracking control stability / control performance and compatibility.

[Brief description of drawings]

FIG. 1 is a block diagram of an information reproducing apparatus according to an embodiment of the present invention.

FIG. 2 is a track pattern diagram according to an embodiment of the present invention.

FIG. 3 is a signal waveform diagram for explaining an example.

FIG. 4 is a block diagram of an information reproducing apparatus according to another embodiment of the present invention.

FIG. 5 is a data configuration diagram in a track in another embodiment of the present invention.

FIG. 6 is a signal waveform diagram for explaining an example.

FIG. 7 is a schematic diagram of a track pattern.

FIG. 8 is a block diagram of an information reproducing apparatus according to another embodiment of the present invention.

[Explanation of symbols]

 1 tape 2a, 2b head 3 cylinder 4 cylinder control unit 5 tracking error detection unit 6 tracking unit 7 tape drive unit 12 gain adjustment unit 15 pilot level detection unit 40 level detection unit

Claims (4)

[Claims] 1. A head mounted on a rotary cylinder is rotationally scanned with respect to a tape medium on which two or more kinds of tracking pilot signals of different frequencies are selectively recorded cyclically in a cycle of four tracks or more. An information reproducing apparatus for reproducing a signal by means of a tape driving means for driving and driving the tape, a first head, and a position which is displaced from the scanning locus of the first head by approximately one track in the track width direction. A second head for scanning, a tracking error detecting means for detecting an amplitude of a tracking pilot signal included in a reproduction signal of the first head, and outputting a tracking error signal based on the amplitude, and a tracking error detecting means based on the tracking error signal. And a tracking means for performing tracking control by operating the tape driving means, and a reproduction signal of the second head. Any of the pilot level detecting means for detecting the amplitude of the tracking pilot signal contained therein and outputting a level detection signal corresponding to the detected amplitude, the first head, the tracking error detecting means, the tracking means, and the tape driving means. The information reproducing apparatus, which is interposed between the paths of (1) and (2) and has a gain adjusting means for adjusting the gain according to the level detection signal. 2. A head mounted on a rotary cylinder is rotationally scanned with respect to a tape medium on which two or more kinds of tracking pilot signals of different frequencies are selectively recorded cyclically in a cycle of four tracks or more. An information reproducing apparatus for reproducing a signal by means of a tape driving means for driving and driving the tape, a first head, and a position which is displaced from the scanning locus of the first head by approximately one track in the track width direction. A second head for scanning, a tracking error detecting means for detecting an amplitude of a tracking pilot signal included in a reproduction signal of the first head, and outputting a tracking error signal based on the amplitude, and a tracking error detecting means based on the tracking error signal. The tape drive means to operate the tape drive means to perform tracking control with a predetermined offset, Pilot level detection means for detecting the amplitude of the tracking pilot signal included in the reproduction signal of the second head and outputting a level detection signal corresponding thereto, and the tracking error detection means, tracking means from the first head. An information reproducing apparatus comprising: a gain adjusting unit that is interposed between any of the paths to the tape driving unit and that adjusts the gain according to the level detection signal. 3. A head mounted on a rotary cylinder is rotationally scanned with respect to a tape medium on which tracking pilot signals of two or more different frequencies are selectively recorded cyclically in a cycle of four tracks or more. An information reproducing apparatus for reproducing a signal by means of a tape driving means for driving and driving the tape, a first head, and a position which is displaced from the scanning locus of the first head by approximately one track in the track width direction. , A second head that scans in time division with the first head, and the amplitudes of the tracking pilot signals included in the reproduction signals of the first and second heads, and outputs a tracking error signal based on the detected amplitudes. The tape drive means is operated based on the tracking error detection means and the tracking error signal obtained during the scanning period of the first head. Detecting a tracking means for performing Kkingu control, the amplitude of the second tracking pilot signal contained in the reproduced signal of the second head based on the tracking error signal obtained during the scanning period of the head,
The level detection signal which outputs a level detection signal corresponding to the level detection signal is interposed between any one of the paths from the first head to the tracking error detection means, the tracking means, and the tape drive means. An information reproducing apparatus comprising: a gain adjusting unit that adjusts the gain according to the above. 4. A head mounted on a rotary cylinder is rotationally scanned with respect to a tape medium on which tracking pilot signals of two or more different frequencies are selectively recorded cyclically in a cycle of four tracks or more. An information reproducing apparatus for reproducing a signal by means of a tape driving means for driving and driving the tape, a first head, and a position which is displaced from the scanning locus of the first head by approximately one track in the track width direction. , A second head that scans in time division with the first head, and the amplitudes of the tracking pilot signals included in the reproduction signals of the first and second heads, and outputs a tracking error signal based on the detected amplitudes. The tracking error detection means and the tape drive means are operated based on the tracking error signal obtained during the scanning period of the first head, A tracking means for performing tracking control with an offset of a quantity, and the amplitude of the tracking pilot signal included in the reproduction signal of the second head is detected based on the tracking error signal obtained during the scanning period of the second head. Corresponding to the level detection signal and the level detection means for outputting a level detection signal corresponding to the above, and any one of the paths from the first head to the tracking error detection means, the tracking means, and the tape drive means. An information reproducing apparatus including: a gain adjusting unit that adjusts a gain.