JPH04162244A - Rotary head type recording-reproducing apparatus - Google Patents

Abstract

PURPOSE:To enable execution of a highly precise tracking control by determining information on the position in the longitudinal direction of a recording medium from a data signal of the rotational frequency of a rotary head which is recorded, and by generating a signal for servo for the tracking control. CONSTITUTION:A capstan tuck generator 32 generates a capstan tuck signal being synchronous with rotation of a capstan motor and a tape timer 33 generates data on the length of a take-up time on a tape 11. The capstan tuck signal and the data on the length of the take-up time are supplied to a servo circuit 31 as occasion demands. Since a data signal on a track in the longitudinal direction has a high frequency, information on a position on the tape, that is, the relative position in the longitudinal direction of a tape-shaped recording medium 11 in relation to a rotary head 20, can be determined exactly from this data signal. The information on the position in the longitudinal direction on the recording medium is determined by using such a data signal as stated above, and further a signal for servo is prepared by using this information on the position. According to this constitution, tracking precision can be improved.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to a rotary head type recording/reproducing device, and in particular to a servo for tracking control that causes the rotary head to follow an inclined track during reproduction. Regarding the system.

(Prior Art) A rotary head type recording and reproducing device is a device that uses a rotary head to record and reproduce video and audio signals along a so-called inclined track on a tape, and is used as a VTR (video tape recorder). has been made into In such a rotary head type recording/reproducing apparatus, tracking control is required to properly follow the rotary head to an inclined track by servo control during reproduction. For this reason, conventionally, a fixed head called a control head is provided in addition to the rotary head, and this head records and reproduces control signals for tracking control along a longitudinal track parallel to the longitudinal direction of the tape.

Generally, a pulse signal having a frame frequency of C30 Hz of a video signal is used as the control signal. When reproducing a video signal or an audio signal recorded on a tape, a control signal is simultaneously reproduced by a control track head. Using this playback control signal and a capstan tack signal synchronized with the rotation of the capstan output from the capstan tack generator, a timer tack signal corresponding to the running distance of the tape is sent to the capstan motor or reel motor. Tracking control is performed by applying phase servo and speed servo to the reel motor.

Incidentally, in rotary head type recording and reproducing devices, in order to realize devices that handle signals with an extremely wide band and a large amount of information, such as VTRs for HDTV (high-definition television), in addition to improving linear recording density, inclined track The number of tracks per unit area is increasing by narrowing the width of the track. As the number of tracks per unit area increases,
That much higher tracking accuracy is required. However, in the conventional technology, the frequency of the control signal is 30
Since the frequency is as low as Hz, HDTV VT is controlled by phase servo using this control signal and capstan tack signal.
It is difficult to achieve the high tracking accuracy required for R due to the frequency characteristics of the phase servo and limitations on the DC gain. Even in the case of speed servo, the control may deviate from the actual tape running speed due to the installation accuracy of the capstan tack generator, variations in its own processing precision, and variations in the outer diameter of the capstan motor shaft. Therefore, it is still difficult to achieve the high tracking accuracy required for HDTV VTRs and the like.

(Problem to be Solved by the Invention) As described above, in the conventional technology that performs tracking control using the control signal reproduced from the control track and the capstan tack signal, there are limitations on the frequency characteristics and DC gain of the phase servo. Due to variations in accuracy, processing accuracy, and variations in the outer diameter of the capstan motor shaft, the installation of the capstan tack generator may require narrower inclined tracks or an increase in the number of tracks per unit area than the current level. There has been a problem in that it is difficult to achieve sufficient tracking accuracy.

SUMMARY OF THE INVENTION An object of the present invention is to provide a rotary head type recording/reproducing device that can perform tracking control with higher precision than the conventional one.

[Structure of the Invention (Means for Solving the Problems) In order to solve the above problems, the present invention runs a tape-shaped recording medium at a predetermined speed and uses a rotary head to move the tape-shaped recording medium in the longitudinal direction of the recording medium. A rotary head type recording/reproducing device that records and reproduces information signals along an inclined oblique track, and also records and reproduces data signals with a frequency higher than the rotational frequency of the rotary head along a longitudinal track parallel to the longitudinal direction of the recording medium. In the apparatus, means for generating positional information in the longitudinal direction of a recording medium from a data signal reproduced from a longitudinal track, and means for generating a servo signal for tracking control for causing a rotary head to follow an inclined track from this positional information. It is characterized by having the following.

Specifically, for example, as the position information, data on the transient interval of the data signal, data on the status of the transient, and a clock synchronized with the bit rate of the data signal are generated.

Further, as servo signals, a phase error signal and a speed clock are generated, which are used to control the rotational phase and rotational speed of a motor such as a capstan motor or a reel motor that is a drive source for running a recording medium.

Furthermore, data signals on longitudinal tracks used to generate position information include, for example, time code data indicating time information of information signals recorded on each inclined track on a tape, and digital audio recorded on fixed tracks. Data, or digital data including comments and attribute information regarding video information, etc. can be used.

If the clock can be extracted from the data signal but the phase information cannot be extracted, the phase information can be extracted from the data obtained by data discrimination of the data signal, or the phase information can be extracted from the reproduced signal from another fixed track or tilted track. They can also be used together.

(Operation) Since the data signal on the longitudinal track has a high frequency, position information on the tape, that is, the relative position of the tape-shaped recording medium in the longitudinal direction with respect to the rotary head can be accurately determined from this data signal. Taking time code data as an example, its frequency is several kHz, which is sufficiently higher than the control signal conventionally used for tracking control.

Therefore, if you use such a data signal to obtain longitudinal position information on the recording medium and then use this position information to create a servo signal, it is easier to use than a method that generates a servo signal from a control signal. This greatly improves tracking accuracy.

In addition, since position information is generated from existing data signals recorded not for the purpose of position information, in some cases it is possible to omit the conventional control track for recording and reproducing position information, thereby making it possible to The upper area can be used effectively, and a head and a recording/reproducing circuit for head roll signals are not required.

(Example) Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows the configuration of a tracking servo system which is a main part of a rotary head type recording/reproducing apparatus according to an embodiment of the present invention. During recording and reproduction, the tape 11 is run in the direction of the arrow by a capstan 12 and a pinch roller (not shown), and is unwound from the supply reel 13 and transferred to the take-up reel 14.
It is wound up. The capstan 12 is driven by a capstan motor 15, and the reels 13 and 14 are driven by reel motors 16 and 17, respectively. The tape 11 is wound diagonally around the outer circumferential surface of a rotating drum 19 driven by a drum motor 18 while it is running, and in the process, a plurality of rotating heads 20 mounted on the rotating drum 19 rotate the tape 11 in the longitudinal direction. Information signals, for example, video signals, are recorded and reproduced along the inclined track 21 which is inclined at this angle.

The tape 11 has longitudinal tracks parallel to the longitudinal direction.
In this example, an audio track 22, a control track 23, and a time code track 24 are provided. Audio track 22 is located near one side edge of tape 11, and control track 23 and time code track 24 are located near the other side edge. Fixed heads 25, 26 and 27 tracing these tracks 22, 23 and 24 record and reproduce audio signals, control signals and time code data, respectively.

When the rotating head 20 reproduces a video signal on the inclined track 21, a tracking servo system for controlling the rotating head 20 to follow the inclined track 21 includes a frame pulse extraction circuit 28, a time code data processing circuit 29, and a servo It is composed of a signal generation circuit 30 and a servo circuit 31. The frame pulse extraction circuit 28 is connected to the control track 2 by the head 26.
A frame pulse is extracted from the control signal reproduced from 3 to generate a control frame pulse CTL/FR, which is a pulse train having the frame period of the video signal.

The time code data processing circuit 29 processes the time code data TC reproduced from the time code track 24 by the head 27 using the base clock B-CLK, and generates transient interval data D1 as longitudinal position information on the tape 11. and status data D2, and a time code reference clock TC/CLK synchronized with the bit rate of time code data TC. Transient interval data D1 is time code data TC
indicates the length between transients. Status data D
2 indicates which status the current transient is in when transients are divided into three statuses: "1", "0", and "H" (half pit).

The time code reference tarlock TC/CLK is generated for each "1m" and "0" transient of the time code data TC.

The servo signal generation circuit 30 receives the control frame pulse signal CTL from the time code data processing circuit 29.
/FR, transient interval data Dl, status data D2, time code reference clock TC/CLK, pace clock from a timing generator not shown, reference frame pulse REF-FR, time code reference frame pulse TC/REF-FR, and not shown Various commands CMDS (DLTI, DLT) from the controller
2゜PH-RATE, MODE, VEL-RATE.

(These will be described later), two types of phase error signals El and E2 and a speed clock VEL-CLK are generated as servo signals for tracking control and supplied to the servo circuit 31. The servo circuit 31 is
Signals El, E2 and VEL-CLK from the servo signal generation circuit 30 and control command C-CMD and speed command S- from a controller (not shown)
The capstan motor 15 and reel motor 17 are controlled based on the CMD and the speed check base clock 5-CLK.

In FIG. 1, the capstan tack generator 32 generates a tack signal (
generates a capstan tack signal). Further, the tape timer 33 generates data on the winding time length on the tape 11. These capstan tack signals and winding time length data are sent to the servo circuit 31 as shown by the broken line.
Supplied as needed.

Next, the configuration of the time code data processing circuit 29 will be explained in detail.

FIG. 2 shows a block diagram of the time code data processing circuit 29, and FIG. 3 shows its timing diagram. The time code data processing circuit 29 includes a variable frequency divider 101, a transient pulse generation circuit 102, a control circuit 103,
It is composed of an up counter 104, a data latch 105, a comparison data generation circuit 106, a transient determination circuit 107, a data latch 108, a status latch 109, and a pit clock extraction circuit 110.

The time code data TC and pace clock B-CLK are input to the time code data processing circuit 29 as described above. The pace clock B-CLK is generated from an oscillator (not shown) or from a voltage controlled oscillator (not shown) in synchronization with a synchronization signal external or internal to the VTR, and in some cases, the output of these oscillators. It is obtained by dividing . The variable frequency divider 101 divides the pace clock B-CLK and divides the pace clock B-CLK into the sub-base clock 12.
Make 1. The transient pulse generating circuit 102 generates a transient pulse 122 when detecting a transient of the time code data TC (corresponding to a change point of magnetization from S pole to N pole, N pole to S pole on the tape 11).

The sub base clock 121 is supplied to the control circuit 103 and also to the clock input terminal of the up counter 104. Transient pulse 122 is input to control circuit 103.

The control circuit 103 controls the transient pulse 12
2 is input, the enable/disable signal 124 supplied to the counter 104 is disabled, and the latch pulse 1 is input to the data latch 105.
26 to cause the data latch 105 to latch the count value 125 of the counter 104. Then, the load pulse 123 is supplied to the counter 104 at the same time as the latch pulse 126 or a little later, and the value of the number of clocks of the sub-base clock 121 corresponding to the time required for processing is loaded into the counter 104, and the enable/ The counting operation is restarted by enabling the disable signal 124. This operation causes data latch 1
05 holds transient interval data D1 indicating the interval between the transient pulses 122, that is, the length between the transients of the time code data TC.

The comparison data generation circuit 106 generates comparison data 127, which serves as a reference when determining a transient in the transient determination circuit 107, from the transient interval data D1 latched in the data latch 105 and the status data D2 latched in the data latch 108. make. This comparison data 127 has a value of 75% of the transient interval data D1 when the status data D2 previously latched by the data latch 108 is "ol", and the data D2
When is "half bit degree" and "11", the data has a value of 150% of the transient interval data D1.

The transient determination circuit 107 compares the comparison data 127 outputted from the comparison data generation circuit 106 and the count value 125 outputted from the up counter 104,
Transient determination data 128 indicating the value of each transient of time code data TC is output. That is, the transient determination circuit 107 uses the status data D
2 is “0” or “1” and the count value 125 is smaller than the comparison data 127, the transient is determined to be “half bit” and the status data D2 is “0”.
Or, if it is “1” and the count value 125 is larger than the comparison data 127, the transient is determined to be “0°”, and if the status data D2 is “half bit” and the count value 125 is smaller than the comparison data 127, the transient is determined to be “1°. If the count value 125 is larger than the comparison data 127, it is essentially an error, but for convenience, the transient is determined to be "1". Transient determination data 128 obtained by such determination
is the latch pulse 129 from the control circuit 103
is latched into the data latch 108, and this latch 108
The output is output as status data D2.

Note that the transient determination data 128 and status data D2 include data bits that specify the frequency division ratio of the variable frequency divider 101, so that the frequency of the sub base clock 121 from the variable frequency divider 101 is adjusted appropriately. and the count value of the up counter 104 is 125.
is kept within a certain range. The above is a time code decoding circuit, but for use in the servo system, a new time code reference clock TC/CLK is created as a source signal.

The transient determination circuit 107 also outputs status data 130 indicating whether the next coming transient is a bit rate transient. This status data 130 is latched in status latch 109. Based on the status data 131 latched in the latch 109, a bit rate transient is extracted from the transient pulse 122 in a pit clock extraction circuit 110, thereby generating a time code reference clock TC/CLK.

Although the explanation has been omitted, there is a pre-processing function that has the functions of compensating for dropouts of the time code data TC reproduced by the head 27 due to dropouts, compensating for noise intrusion, and processing data with a rate of change greater than a specified value. By adding a circuit in the time code data processing circuit 29, for example, before the transient pulse generation circuit 102, it is also possible to perform more stable servo control.

Next, using FIG. 4, the time code reference frame pulse TC/ which is the phase information that is the reference during reproduction inputted from the time code data TC to the servo signal generation circuit 30.
A method for generating REF-PR will be explained. In this embodiment, this time code reference frame pulse TC/RE
Although the circuit that generates F-FR has been omitted, the synchronization word in the time code data TC is the status data D.
The time code reference frame pulse TC/REF-FR is detected from the bit pattern of the synchronization word and the information of “02. The synchronization word can be detected even more quickly by using knowledge of the direction of tape 11 travel.

Next, the configuration of the servo signal generation circuit 30 will be explained in detail.

FIG. 5 shows a block diagram of the servo signal generation circuit 30, and FIGS. 6 and 7 show its timing diagram. The servo signal generation circuit 30 includes a time code reference frame pulse delay circuit 201 and a timing pulse generation circuit 202.
, a phase comparator 203 for each frame, a phase clock generation circuit 204, a phase comparator 205 for each clock, and a speed clock generation circuit 206.

The frame pulse delay circuit 201 delays the reference frame pulse REF-FR according to the delay time designation command DLTI, thereby delaying the reference frame pulse DL-FR.
Create REF-FR. This reference frame pulse delay circuit 201 is constituted by a variable delay circuit using a down counter, for example, and after the delay time designation command DLTI is loaded as an initial value by applying the reference frame pulse REF-PR, the pace clock B- CLK is counted down, and when the count value reaches "O", a delayed reference frame pulse DL-REF-FR is generated.

The mode setting signal MODE is the servo signal generation circuit 30.
This is a signal for selectively setting the operation mode of the mode from modes 1, 2.3. In mode 1.2, the control signal CT reproduced from the control track 23 in FIG.
In mode 3, control signal CTL is used without using L. Each mode will be explained with reference to FIGS. 6 and 7.

Mode 1 The timing diagram for this mode 1 is shown in FIG. When the mode setting signal MODE is set to mode 1, the timing pulse generation circuit 202 generates a time code reference frame pulse TC/RE obtained from the time code data TC.
The time code frame pulse TC/USE-FR is generated at the same timing as F-PR, and the time code reference clock TC/USE-FR is generated at the division ratio (including 1) corresponding to the rate specified by the phase rate command PH-RATE.
Divide CLK to create time code phase clock TC/PH
-Generate CLK.

The phase comparator 203 detects the delayed reference frame pulse DL at the timing of the pace clock B-CLK.
-REF-FR and time code generation frame pulse TC
/Compare the phases of USE-FR and show the phase difference between the two,
A frame-by-frame phase error signal E1 is generated.

The phase clock generation circuit 204 is constituted by a variable frequency dividing circuit, and uses the pace clock B-CLK to generate the delayed reference frame pulse DL-REF-FR and the phase rate command TC/PH-RATE. 204 is constituted by a variable frequency dividing circuit using a down counter, for example, and is configured to output a delayed reference frame pulse D.
After the initial value corresponding to the phase rate command PH-RATE is loaded by giving L-REF-FR, the pace clock B-CLK is counted down, and when the count value reaches "0", the delayed phase clock is started. DL-
Generates PH-CLK.

When the count value reaches 0, it returns to the initial value and counts down again. By repeating this operation, the delayed phase clock DL-PH-CLK is generated at the same frequency as the time code phase clock TC/PH-CLK to be compared.

The phase comparator 205 detects the delayed phase clock DL-PH at the timing of the pace clock B-CLK.
-Generates a phase error signal E2 in clock units indicating the clock phase difference between CLK and the time code phase.

The speed clock generation circuit 206 generates a pace clock B-C.
The time code time load reference clock generation circuit 206 is configured with a down counter, for example, and generates the time code reference clock TC/CLK at the division ratio (including 1) specified by the speed rate command VEL-RATE using LK. After the initial value corresponding to the speed rate command VEL-RATE is loaded, the pace clock B-CLK is counted down, and when the count value reaches "0", the speed clock VEL-C is
Generates LK.

In contrast to the example in which mode 1 uses the time code reference clock TC/CLK as phase information, modes 2 and 3
is a method of obtaining phase information between the time code reference clocks TC/CLK, which further reduces restrictions on the clock rate. A timing diagram for modes 2 and 3 is shown in FIG.

Mode 2 When the mode setting signal MODE is set to mode 2, the timing pulse generation circuit 202 outputs the pace clock B-C.
Using LK, time code reference frame pulse TC/REF-FR according to delay time specification command DLT2.
The time code generation frame pulse TC/USE-FR is created by delaying the time code by time T2, and the time code reference clock TC/CLK and the data latches 105, 1 in FIG. 2 are generated by the phase rate command PH-RATE.
From the transient interval data D1 and status data D2 from 08, the time code generation frame pulse clock 'l' L: /F1-1-UL
Make K.

Phase comparators 203 and 205 receive phase error signals El in frame units and clock units as in the case of mode 1.
, E2, respectively.

Further, as in the case of mode 1, the phase clock generation circuit 205 also generates a phase clock DL-PH-CLK having a frequency according to the phase rate command PH-RATH in synchronization with the delayed reference frame pulse DL-REF-FR. .

The speed clock generation circuit 206 generates a pace clock B-C.
A speed clock VEL-CLK is generated from the time code reference clock TC/CLK, transient interval data D1, and status data D2 using the speed rate command VEL-RATE using LK. That is, the positional information between the time code reference clocks TC/CLK can be found from the transient interval data D1 and status data D2 of the time code data TC. Using this, the motor tote fast clock ゛1' U /
L: Pace clock B- between LK clocks
It is generated using a method that is a fraction of the number of clocks of CLK. As a result, the clock rate of the speed clock VEL-CLK is less restricted than in mode 1.

In addition, the timing of position detection is determined using time code data TC.
The frequency of the speed clock VEL-CLK can be made higher or lower than the time code reference clock TC/CLK by shifting the frequency from the transient point of the time code reference clock TC/CLK. Since the speed clock VEL-CLK does not particularly need to be synchronized with the time code generation frame pulse TC/USE-FR, there are fewer restrictions on the clock rate, and various frequencies can be selected.

Mode 3 In this mode 3, instead of the time code reference frame pulse TC/REF-FR in the previous mode 2, the control frame pulse C from the frame pulse extracting circuit 28 of FIG.
This mode differs from mode 2 in that TL/FR is used. In this way, the time code generation frame pulse TC/USE-FR is applied to the control frame pulse CTL/FR.
.

Time code phase clock TC/PH-CLK.

60Hz by synchronizing the delayed phase clock DL-PH-CLK and speed clock VEL/CLK, etc.
Alternatively, more phase comparisons can be made compared to phase comparisons using only the control track signal of the 30 Hz frequency component, so the servo band is expanded and the control characteristics are improved.

Note that there are two types of frame-based phase error signals E2 and frame-based phase error signals El.

Use E2 in combination, use only one of the speed clocks VEL-CLK, or combine two or more, or use the speed clock VEL/CLK to generate a speed error signal, so you can directly generate the speed error signal. If you decide to make one, you can simplify the circuit and signals as appropriate, such as configuring the frame-based phase comparator 203, the clock-based phase comparator 205, and the speed measuring device 308 in a common circuit and use them in a time-sharing manner. good.

Next, a specific example of the servo circuit 31 shown in FIG.'M1 will be explained. FIG. 8 is a block diagram showing an example of the configuration of a servo circuit 31 using a phase servo and a speed servo.
03° 304, compensation filters 305, 306, and summing amplifier 307 are provided, and for speed servo, a speed measuring device 308, a data converter 309, and a D/A converter 31 are provided.
0, compensation filters 311 and 312 are provided. Further, selectors 313 and 314 are provided to select between phase servo and speed servo, and compensation for controlling the rotational phase and rotational speed of the capstan motor 15 and reel motor 17 using the outputs from the selectors 313 and 314. Filters 315 and 316 and motor drive amplifier (M
DA) 317°318 are provided.

First, phase servo will be explained. The frame-by-frame phase error signal E1 from the servo signal generation circuit 30 is
The data is input to a data converter 301. Data converter 301
is the speed command S-C regarding the rotational speed of the capstan motor 15 and reel motor 17 that was input separately.
MD and the control command C-CMD are used to convert the phase difference corresponding to the speed command S-CMD into a voltage value, and the voltage value is converted into data (D/A) in a format suitable for input to the D/A converter 303. A conversion data) and supplied to the D/A converter 303. Such a data converter 301 can be realized by, for example, a ROM. R.O.
Frame unit phase error signal E1 is input to the address input of M.
, control command C-CMD and speed command S-CMD, and output D/A from the data output of ROM.
All you have to do is output the conversion data. Other data converter 30
2,309 can be similarly realized by ROM.

The data for D/A conversion from the data converter 301 is D/A.
After being converted into an analog voltage by the converter 303 and further phase compensated by the compensation filter 305, the summing amplifier 30
7 to the first input terminal.

On the other hand, the phase error signal E2 in clock units from the servo signal generation circuit 30 is processed by the speed command S in the data converter 302 similarly to the phase error signal E1 in frame units.
- After being converted into a voltage value corresponding to the amount of phase error corresponding to CMD and further converted into data for D/A conversion, D
/A converter 304. This D/A conversion data is converted into an analog voltage by a D/A converter 304, and then subjected to phase compensation by a compensation filter 306, and then applied to the second input terminal of the summing amplifier 307, and then the first input terminal is added to the output of compensation filter 305 given to .

The output of the summing amplifier 307 is connected to the selector 313.31.
4 is input.

The control command C-CMD is used by the selector 313 to input the output of the summing amplifier 307 and the output of the compensation filter 311 to the compensation filter 315 when using phase servo in the standard playback mode or slow playback mode of the VTR.
control. Compensation filter 315 is summing amplifier 30
7 and the output of the compensation filter 311 to perform phase compensation and output to the MDA 317.

MDA 317 converts the output of compensation filter 315 into a motor drive current or voltage and supplies it to capstan motor 15 in FIG. At this time, the selector 314 blocks all input signals, so the reel motor 17 is not servoed for phase or speed.

Further, the control command C-CMD controls the selector 314 to input the output of the summing amplifier 307 and the output of the compensation filter 312 to the compensation filter 316 when using phase servo in variable speed (shuttle) reproduction mode. The compensation filter 316 adds the output of the summing amplifier 307 and the output of the compensation filter 312 to perform phase compensation, and M
Output to DA318. Like the MDA 317, the MDA 318 converts the output of the compensation filter 316 into a motor drive current or voltage and supplies it to the reel motor 17 in FIG. At this time, the selector 313 blocks all input signals, so the capstan motor 15 is not subjected to phase or speed servo.

Next, the speed servo will be explained. A speed clock VEL-CLK from the servo signal generation circuit 30 and a speed check pace clock 5-CLK generated from the base clock B-CLK are input to the speed measuring device 308.

The speed measuring device 308 is constituted by, for example, a counter, and counts the speed check pace clock 5-CLK to measure the period of the speed clock VEL-CLK to know its frequency. A speed error signal corresponding to this frequency is input to data converter 309. The data converter 309 is
Using the speed command S-CMD and control command C-CMD that were input separately, the speed command S
- Convert the speed error amount corresponding to CMD into a voltage value, further convert the voltage value into data in a format suitable for input to the D/A converter 310 (data for D/A conversion), and convert it into a D/A converter 310.
Converter 310 is supplied. D/A conversion data is D/A
After being converted into an analog voltage by a converter 310 and phase compensated by two compensation filters 311 and 312, the signals are input to selectors 313 and 314, respectively.

Control command C-CMD controls selector 313 so that the output of compensation filter 311 is input to compensation filter 315 when speed servo is used in standard playback mode or slow playback mode of the VTR. Compensation filter 31
5 is the output of the summing amplifier 307 and the compensation filter 311
The outputs are added together for phase compensation and output to the MDA317. MDA 317 converts the output of compensation filter 315 into a motor drive current or voltage and supplies it to capstan motor 15 in FIG.

At this time, the selector 314 blocks all input signals, so the reel motor 17 is not servoed for phase or speed.

In addition, the control command C-CMD is set by the selector 31 to input the output of the compensation filter 312 to the compensation filter 316 when using the speed servo in the variable speed playback mode.
Control 4. Compensation filter 316 is summing amplifier 3
The output of 07 and the output of compensation filter 312 are added together for phase compensation and output to MDA 318. MDA318 is MD
Similar to A317, the output of the compensation filter 316 is converted into a motor drive current or voltage, and the reel motor 17 in FIG.
supply to.

At this time, the selector 313 blocks all input signals, so the capstan motor 15 has no phase.

Speed servo does not work.

In addition, in the above embodiment, a case was explained in which a signal from a time code was used for phase servo and speed servo.
It may be used for only one of them. Further, although both the capstan servo and the reel servo have been described for tracking control, only either one may be used.

In addition, time code data was used as the data signal used to generate position information, but as mentioned above, digital audio data is recorded on the longitudinal track, and digital data of comments and attribute information regarding video information on the inclined track is recorded. location information can also be generated from those data signals.

In addition, the present invention can be implemented with various modifications without departing from the scope of the invention.

[Effects of the Invention] According to the present invention, position information in the longitudinal direction of the recording medium is obtained from the data signal of the rotational frequency of the rotary head recorded on the longitudinal track without the purpose of position information, and based on the position information. By generating a servo signal for tracking control, tracking control can be performed with much higher precision than when using control signals recorded on control tracks.

That is, it is possible to increase the frequency characteristics and DC gain in both phase servo and frequency servo, thereby improving the servo characteristics.

Further, according to the present invention, the area of the recording medium can be effectively utilized by omitting the control track, and the control signal can also be used in conjunction with tracking control to utilize more phase information.

Therefore, the present invention greatly improves tracking accuracy, making it possible to respond to the higher density and narrower tracks required for future HDTV VTRs, etc., and has great practical effects.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the configuration of a tracking servo system in a rotary head type recording/reproducing apparatus according to an embodiment of the present invention, FIG. 2 is a block diagram showing the configuration of the time code data processing circuit in FIG. 1, and FIG. The figure is a timing diagram for explaining the operation of FIG. 2, and FIG. 4 is a diagram showing the relationship between time code data and time code reference frame pulse.
FIG. 5 is a block diagram showing the configuration of the servo signal generation circuit in FIG. 1, FIGS. 6 and 7 are timing diagrams for explaining the operation of FIG. 5, and FIG. 8 is the servo circuit in FIG. 1. FIG. 2 is a block diagram showing a configuration example. 11... Tape, 12... Capstan, 13.1
4... Reel, 15... Capstan motor, 16° 17... Reel motor, 18... Drum motor, 1
9... Rotating drum, 20... Rotating head, 21...
・Slope track, 22...Audio track, 23
...Control track, 24...Time code track, 25..., 26.27...Fixed head,
28... Frame pulse extraction circuit, 29... Time code data processing circuit, 30... Servo signal generation circuit, 31... Servo circuit. Applicant's agent Patent attorney Takehiko Suzue

Claims (3)

[Claims] (1) While running a tape-shaped recording medium at a predetermined speed, information signals are recorded and reproduced using a rotary head along an inclined track that is inclined with respect to the longitudinal direction of the recording medium. In a rotary head type recording and reproducing device that records and reproduces a data signal having a frequency higher than the rotational frequency of a rotary head along a longitudinal track parallel to the longitudinal track, the position in the longitudinal direction of the recording medium is determined from the data signal reproduced from the longitudinal track. A rotary head type recording/reproducing apparatus comprising: means for generating information; and means for generating a servo signal for tracking control for causing the rotary head to follow the inclined track from the position information. (2) The means for generating the position information generates, as the position information, data on the transient interval of the data signal, data on the status of each transient, and a clock synchronized with the bit rate of the data signal. The rotary head type recording/reproducing device according to claim 1. (3) The means for generating the servo signal includes a phase error signal and a speed error signal for controlling at least one of a rotational phase and rotational speed of a motor of a drive source that runs the recording medium using the positional information. 3. The rotary head type recording and reproducing apparatus according to claim 1, wherein at least one of the following is generated as the servo signal.