JPH03232147A - Tracking control circuit - Google Patents

Abstract

PURPOSE:To scan 1st and 2nd recording heads on a recording track almost in the just tracking state by detecting average value information resulting from averaging prescribed tracking error information. CONSTITUTION:First and 2nd tracking information areas ATF1, ATF2 of 1st and 2nd recording tracks TA, TB of a magnetic tape 13 are reproduced sequentially and alternately by 1st tracking error information detection means 36, 37, 38, 39, 44 to detect 1st - 8th tracking error information sets T1 - T8. Then the 1st tracking error information selection means 38, 40, 42, 43, 44 select the 1st and 2nd tracking error information sets T1, T2 obtained first and 7th, 8th tracking error information sets T7, T8 obtained second, detect average value information CAFT by averaging the information sets and controls a feed speed by using the average value information. Thus, the 1st and 2nd rotary heads are controlled to scan the 1st and 2nd recording tracks in the just tracking state.

Description

[Detailed description of the invention] The present invention will be explained in the following order.

A: Industrial field of application B: Overview of the invention C: Prior art (Fig. 7) D: Problems to be solved by the invention (Figs. 8 and 9) Means for solving the 8 problems (Figs. 1 to 9) Figure 5) F action (Figures 1 to 5) G embodiment (Gl) Overall configuration of D A T (Figure 6) (G2) Tracking control circuit of the first embodiment (Figures 1 and 2) ) (G3) Tracking control circuit of the second embodiment (Figures 2 and 3) (G4) Tracking control circuit of the third embodiment (Figures 3 and 4) (G5) Tracking of the fourth embodiment Control circuit (FIGS. 3 and 5) (G6) Tracking control circuit of fifth embodiment (FIGS. 3 and 5) (G7) Other embodiments H Effects of the invention A Industrial application field The present invention The present invention relates to a tracking control circuit and is suitable for use in, for example, a rotary head type digital audio tape recorder.

B Summary of the Invention The present invention provides a tracking control circuit that detects one record by sequentially and alternately reproducing first and second tracking information areas formed in first and second recording tracks of a magnetic tape. By averaging predetermined tracking error information among multiple pieces of tracking error information corresponding to a unit of recorded data to detect average value information, it is possible to use this average value information to adjust the magnetic tape feeding speed. If controlled, the first and second rotary heads can be controlled to scan the first and second recording tracks in a substantially just tracking state even when the recording and reproducing apparatus operates in various reproduction modes. .

C. Prior Art Conventionally, a rotary head type digital audio tape recorder (hereinafter referred to as DAT) has been used as a tape recorder device capable of recording audio signals at high density.

In this DAT, human-powered audio data is recorded on a magnetic tape that is wrapped around the rotating drum at a predetermined angle using a rotating head placed on a rotating drum, or recorded audio data is recorded on a magnetic tape. Data is reproduced using a rotating head.

In order to correctly reproduce the recorded audio data recorded on the magnetic tape, it is necessary for the rotary head to scan the recording track of the magnetic tape in a just tracking state.
(autosIatic track foli.

A tracking control method using the Hing method is used.

That is, as shown in FIG. 7, on a magnetic tape 1 on which digital audio data is recorded based on the DAT format, recordings are sequentially and alternately recorded using rotary heads 2 (2A, 2B) having positive and negative azimuth angles. Truck T
A and TB are formed diagonally to the running direction a of the magnetic tape 1.

At predetermined positions at the lower end and upper end of each recording track TA, TB, there are first and second ATF recording areas AT in which an ATF synchronization signal and an ATF pilot signal are recorded, respectively.
FI and ATF2 are formed.

In addition, the first and second ATF recording areas ATF1 and A
Between TF2 are first and second recording tracks TA and T.
A data recording area DATA is formed in which digital audio data is recorded using B as one recording unit (so-called interleave unit).

As a result, at the time of reproduction, for example, in one recording track TA, the first
or A in the second ATF recording area ATF1 or ATF2
When the TF synchronization signal is detected, the ATF pilot signals recorded on the adjacent recording tracks TB are read out in a time-sharing manner according to the detection timing of this ATF synchronization signal, and the magnetic tape is read out according to the level difference of the ATF pilot signals. A first or second ATF error signal corresponding to the amount of off-track on the lower end side or upper end side of 1 is obtained.

In this way, the feeding speed of the magnetic tape 1 is adjusted to the first and second AT.
By controlling the drive based on the F error signal, the rotary head 2 can scan a predetermined recording track TA of the magnetic tape 1 in a just tracking state.

In practice, in the DAT, the rotating heads 2A, 2 have positive and negative azimuth angles as shown in FIG. 8(A).
B are placed on a rotating drum 3 with a diameter of 30 [diameter] and 18
The rotating drum 3 is arranged at an angular interval of 0 degrees, and the magnetic tape 1 is wound around the rotating drum 3 at an angular interval of 90 degrees.

In this DAT, the rotating drum 3 is generally
00 (rpm), and the running speed of the magnetic tape 1 is controlled to a predetermined running speed, and the first and second rotary heads 2 are rotated in accordance with one revolution of the rotary drum 3.
A and 2B are controlled to scan the first and second recording tracks TA and TB on the magnetic tape 1 once, respectively.

As a result, from the first and second rotating heads 2A and 2B, for example, the first rotating head 2
The first recording track TA is reproduced by the first rotary head 2A during a period in which the rotary drum 3 rotates from 0 degrees to 90 degrees based on the timing when a person contacts the first recording track TA. During the period in which the rotary drum 3 rotates from 180 degrees to 270 degrees, a reproduced signal S produced by reproducing the second recording track TB with the second rotary head 2B is transmitted. Ru.

Note that the rotating drum 3 is rotated from 90 degrees to 180 degrees and 270 degrees.
During the period of rotation from 360 degrees to 360 degrees, the first and second
This means that neither of the rotating heads 2A, 2B is in contact with the magnetic tape l.

DAT is extracted from the reproduced signals SA and S8 in FIG. 9 (B
), the timing TATFI% of the ATF recording areas ATFI and ATF2 according to the DAT format.
The ATF synchronization signal is detected by Tatrz, and the ATF error signal, which is the difference between the ATF pilot signals obtained in response, is used to control the feeding speed of the magnetic tape 1, thereby making it possible to perform tracking control using the ATF method. ing.

Problems to be Solved by the Invention In the conventional DAT, instead of the rotating drum 3 having a diameter of 30 (W), as shown in FIG.
There is a device that uses a rotating drum 4 consisting of [2] to make the mechanical mechanism portion smaller.

That is, on this rotating drum 4, there are rotating heads 2A, 2.
B are arranged at an angular interval of 180 degrees from each other, and a magnetic tape L is arranged at an angle of 180 degrees with respect to the rotating drum 4.
It is wrapped over an angular spacing of 0 degrees.

In this DAT, the rotary drum 4 is rotated at the same rotation speed as the rotary drum 3, and the running speed of the magnetic tape 1 is similarly controlled, so that the first and second rotations are controlled in accordance with one revolution of the rotary drum 4. The heads 2A and 2B are controlled to scan the first and second recording tracks TA and TB on the magnetic tape 1 once, respectively.

In this way, the first and second rotating heads 2A, 2B
From then on, as shown in FIG. 9(C), for example, the period during which the rotary drum 4 rotates from 0 degrees to 180 degrees is based on the timing when the first rotary head 2A contacts the first recording track TA. During this period, a reproduction signal Sa+ obtained by reproducing the first recording track TA with the first rotary head 2A is sent out, and during a period in which the rotary drum 4 rotates from 180 degrees to 360 degrees, the reproduction signal Sa+ is transmitted from the first recording track TA. A reproduced signal SS+ obtained by reproducing TB with the second rotary head 2B is sent out.

The DAT extracts the ATF from the reproduced signals SAI and Sll according to the DAT format as shown in FIG. 8(D).
Timing TA of recording areas ATFI and ATF2? F!
, the ATF synchronization signal is detected by the TATF4, and the ATF error signal formed by the difference between the ATF pilot signals obtained in response to this is used to control the feeding speed of the magnetic tape 1, so that tracking control can be performed using the ATF method. being done.

However, in the case of this DAT, since the rotating drum 4 is selected to have a diameter 1/2 times that of the rotating drum 3, the relative speed of the rotating heads 2A, 2B with respect to the magnetic tape 1 becomes 1/2 times that of the rotating drum 3.

In fact, these reproduction signals SAl, S□ are designed to detect the magnetization pattern on the magnetic tape 1 as a differential output, so when the relative speed of the rotary heads 2A, 2B and the magnetic tape 1 becomes 1/2, the magnetic flux The change becomes 1/2, and as a result, the reproduced signal SA detected using the rotating drum 3,
It is 1/2 times as high as the level of 31.

For this reason, the reproduced signal processing system requires an amplifier circuit with a gain to compensate for this, and a waveform with equalization characteristics corresponding to the difference in frequency characteristics of the reproduced signals SA, S, and SAI, S□.

In addition to this, the relative speed becomes 1/2, so
The frequency of the reproduced clock included in the reproduced signals Sat and S□ is also halved, and the digital signal processing circuit itself also requires a corresponding clock signal.In the end, in the DAT using the rotating drum 4 with a diameter of 15㎜, is diameter 30 [■]
There was a problem in that the reproduction signal processing system of the DAT using the rotating drum 3 could not be used as is.

To solve this problem, a rotating drum 4 with a diameter of 15
In the DAT using the magnetic tape 1 and the rotating head 2, the rotation speed of the rotating drum 4 is selected to be twice that of the DAT using the rotating drum 3 with a diameter of 30 C.
The relative speed with A and 2B is determined by DAT using the rotating drum 3.
It is considered that the reproduced signal processing system can be used as is by doing the same.

However, if you do this, the magnetic tape l will have a diameter of 30 [
When the magnetic tape 1 is run at the same running speed as the DAT using the rotating drum 3, the rotating heads 2A and 2B scan the corresponding recording tracks TA and TB twice, and the running speed of the magnetic tape 1 increases. If it is multiplied by l/2, scanning is performed four times each.

Therefore, the rotary heads 2A and 2B are in a so-called off-track state with respect to the corresponding recording tracks TA and TB.
As a result, in the tracking control method using the ATF method, there is a problem in that the rotary heads 2A, 2B cannot be tracked on the recording tracks TA, TB.

This problem can be solved by using a so-called soft tape with a diameter of 15 mm, on which music programs have been copied in advance on recording tracks that have a track pitch 1.5 times that of the recording tracks TA and TB.
The same problem occurs when reproducing data using a DAT using the rotary head 4 in [a].

In addition, DAT using a rotating drum 3 with a diameter of 30 [■]
Now, when playing back such a soft tape, the magnetic tape l is run at 1.5 times the normal tape running speed, and the playback signal processing system is thereby shared to play back the soft tape. ing.

The present invention has been made in consideration of the above points, and is applicable to a magnetic recording/reproducing device in which the rotating head scans the corresponding recording track twice or four times. The purpose of this paper is to propose a tracking control circuit that can perform scanning in an approximately just tracking state.

E! I! ! Means for Solving In order to solve the problem, in the first invention, the first
First and second records are formed at different azimuth angles in diagonal directions with respect to the running direction a of the magnetic tape 13, which is wound around a rotating drum 11 that rotates at a rotational speed of , and runs at a first running speed. Tracks TA and TB are scanned once by first and second rotary heads 12A and 12B, respectively, which have corresponding azimuth angles and are placed on rotary drum 11. For the first reproduction mode in which recorded data for a recording unit is obtained, the rotary drum 11 is rotated at a second rotation speed that is twice the first rotation speed, and the first and second recording tracks TA and A magnetic recording and reproducing apparatus 10 that operates in a second reproducing mode in which the TB is scanned twice with the first and second rotary heads 12A and 12B, respectively, to obtain recording data for one recording unit recorded on the magnetic tape 13. In the tracking control circuit 30, the first and second recording tracks T of the magnetic tape 13
The first and second tracking information areas ATFI and ATF2 formed in A and TB are sequentially and alternately reproduced to produce first to eighth tracking error information T, . First tracking error information detection means for detecting T++ 36.37.38.3
9.44 and the first to eighth tracking error information T, -T obtained from the first tracking error information detection means 36, 37, 38, 39, and 44, of the first recording track TA. First and second tracking error information T, , T, and second tracking information obtained by reproducing the first and second tracking information areas ATFI and ATF2 for the first time.
first tracking error information selection for selecting the seventh and eighth tracking error information T, , T, obtained by reproducing the first and second tracking information areas ATFI and ATF2 of the recording track TB for the second time; Means 38.4
0242.43.44 and the first, second, seventh, and eighth tracking error information T, , T2, and T7 selected by the first tracking error information selection means 38.40.42.43.44. , T8 to detect average value information CA'rF.

Further, in the second invention, in the tracking control circuit 50 of the magnetic recording and reproducing apparatus 10 operating in the second reproduction mode, the first and the second tracking information areas ATFI and ATF2 are sequentially and alternately reproduced to record the first to eighth tracking information areas corresponding to one recording unit of recorded data.
first tracking error information detection means 36.37.38.3 for detecting tracking error information T1 to T of
9.52 and the first to eighth tracking error information T, -T obtained from the first tracking error report detection means 36.37.38.39.52, the first recording track TA The first or second tracking error information T obtained by reproducing the first or second tracking information area ATFI or ATF2 for the first time, or the first or second tracking of T2 and the second recording track TB. Seventh or eighth tracking error information T7 or T obtained by reproducing the information area ATFI or ATF2 for the second time
Second tracking error information selection means 3 for selecting 8
8.40.42.51.52 and the first or second and seventh or eighth tracking error information T1 or A second average value detection means 52 is provided which averages Tz and T or T8 to detect average value information CATF.

Furthermore, in the third invention, for the first reproduction mode, the rotary drum 11 is rotated at a second rotation speed that is twice the first rotation speed, and the magnetic tape 13 is rotated at the first running speed. The third and fourth records are made to travel at a second running speed that is 1.5 times that of the first and second recording tracks TA and TB, and are formed with a track pitch that is 1.5 times that of the first and second recording tracks TA and TB. Magnetic recording having a third reproduction mode in which the tracks TAX and TBX are scanned twice with the first and second rotary heads 12A and 12B, respectively, to reproduce one recording unit of recorded data recorded on the magnetic tape 13. In the tracking control circuit 50 of the playback device IO, first and second tracking information areas ATF are formed in the third and fourth recording tracks TAX and TBX of the magnetic tape 13, respectively.
A second tracking error information detecting means 36.37 for detecting first to eighth tracking error information T, -T corresponding to one recording unit of recorded data by sequentially and alternately reproducing data I, ATF2. 38.39.52 and its second tracking error information detection means 36.37.38.39
．． Of the first to eighth tracking error information T, -T obtained from 52, the first one of the third recording track TAX
The first tracking error information T1 obtained by reproducing the tracking information area ATFI for the first time and the second tracking information area ATF of the fourth recording track TBX.
a third tracking error information selection means 38, 40, 42, 51, 52 for selecting the eighth tracking error information T obtained by reproducing 2 for the second time; .40.42.51
．． Average value information CALF is obtained by averaging the first and eighth tracking error information T1 and T3 selected by 52.
A third average value detection means 52 for detecting the average value is also provided.

Furthermore, in the fourth invention, for the first reproduction mode, the rotating drum 11 is rotated at a second rotation speed that is twice the first rotation speed.
At the same time, the magnetic tape 11 is run at a third running speed that is 1/2 times the first running speed, and the first and second recording tracks TA and TB are set to the first and second recording tracks TA and TB. Tracking control circuit 50 of the magnetic recording and reproducing apparatus 10 having a fourth reproducing mode in which the second rotary heads 12A and 12B scan four times each to reproduce one recording unit of recorded data recorded on the magnetic tape 13. , the first and second recording tracks TA, TB of the magnetic tape 11
The first and second tracking information areas ATFI and ATF2, respectively formed in Third tracking error information detection means to detect 36.37.38.39.52
and its third tracking error information detection means 36.
Among the first to sixteenth tracking error information T1 to TI6 obtained from 37.38.39.52, the first and second tracking information areas A of the first recording track TA
First and sixth tracking error information T I, T obtained by reproducing TFI and ATF2 for the first and second times
b and the first and second tracking information areas ATFI and ATF2 of the second recording track TB for the third and fourth time.
Fourth tracking error information selection means 38.40.42.51 for selecting the 11th and 16th tracking error information T I l and T I 6 obtained by the second reproduction.
．． 52 and the first tracking error information selected by the fourth tracking error information selection means 38.40.42.51.52.
, sixth, eleventh and sixteenth tracking error information T
, ,T, ,T, and T1. Average value information C
, , , is provided.

Furthermore, in the fifth invention, the tracking control circuit 5 of the magnetic recording/reproducing apparatus 10 having the fourth reproduction mode is provided.
0, the first and second tracking information areas ATFI and ATF2 formed in the first and second recording tracks TA and TB of the magnetic tape 11 are sequentially and alternately reproduced to record data for one recording rate. Third tracking error information detection means 36,37 for detecting first to sixteenth tracking error information T, -'-T, , corresponding to
．． 38.39.52 and the first to sixteenth tracking error information T1 to TI& obtained from the third tracking error information detection means 36.37.38.39.52.
Among them, the first and second tracking information areas ATFI and ATF2 of the first recording track TA are
The fifth and tenth tracking error information T0, T6 obtained by the second reproduction and the first tracking error information of the second recording track TB.
and second tracking information areas ATFI and ATF2
The 11th and 16th results obtained by playing the 3rd and 4th times.
fourth tracking error information selection means 38.40.42 for selecting tracking error information Tll and TI6;
．． 51.52 and the first, sixth, eleventh and sixteenth tracking error information T+, Tb, Tll and T4 selected by the fourth tracking error information selection means 38.40.42.51.52. Any two T
, ,T, b selected and averaged average value information CA? A fourth average value detection means 52 for detecting F is also provided.

F action first tracking error information detection means 36.37.3
8.39.44, the first and second tracking information areas ATFI and AT formed in the first and second recording tracks TA and TB of the magnetic tape 13, respectively.
1st to 8th tracking error information 'r, -T corresponding to recorded data of 1 recording rate by sequentially and alternately reproducing F2.
a, and the first tracking error information selection means 38.40.42.43.44 reproduces the first and second tracking information areas ATFI and ATF2 of the first recording track TA for the first time. The first and second tracking error information T, , T obtained by Eighth tracking error information T? , Ta are selected and averaged in the first average value detection means 44 to detect the average value information CATF, so that the feeding speed of the magnetic tape 13 can be controlled using this average value information CATF. For example, in the second playback mode, the first
and the second rotating heads 12A and 12B are the first and second rotating heads 12A and 12B
It is possible to control the recording tracks TA and TB to be scanned almost in a just-tracking state.

Also, the first tracking error information detection means 36.37
．． Among the first to eighth tracking error information T I''Ts detected at 38.39.52, the 20th) ranking error information selection means 38.40.42.51.
At 52, the first or second of the first recording track 1''A
Tracking information area ATFL or t: AT F2
The second tracking error information T1 or T2 and the first or second tracking information area 4 of the second recording track TB. A.T.
The seventh result obtained by regenerating F1'gL and ATF2 for the second time
In addition, the eighth tracking error information 77 or T8 is selected and averaged by the second average value detection means 52 to obtain the average II! ! By detecting the information CATF, the first and second rotary heads 12 . A and 12B can be controlled to scan the first and second recording tracks TA and TB in a manner similar to just tracking.

Second tracking error information detection means 36.3
7.38.39.52, for the first and second recording tracks TA and TB of the magnetic tape 13, 1.
The first and second tracking information areas ATFI and ATF2 formed in the third and fourth recording tracks TAX and TBX having five times the track pitch are sequentially and alternately reproduced to record data for one recording unit. The third tracking error information selection means 38 detects the first to eighth tracking error information T1 to T8 corresponding to
．． 40.42.51.52, the first tracking error information T obtained by reproducing the first tracking information area ATFI of the third recording track TAX for the first time.
, and the eighth tracking error information T8 obtained by reproducing the second tracking information area ATF2 of the fourth recording track TBX for the second time1, and average these by the third average value detection means 52. Since the average value information C01 is obtained by using the average value information CATW, the feeding speed of the magnetic tape 13 can be controlled using the average value information CATW; are the third and fourth recording tracks TAX and TBX
It can be controlled to scan the top with almost just tracking.

Furthermore, third tracking error information detection means 36
．． In 37.38.39.52, magnetic tape 13
first and second tracking information areas ATF formed in the first and second recording tracks TA and TB, respectively;
1st to 16th tracking error information T corresponding to one recording unit of recorded data by sequentially and alternately reproducing I and ATF2.

~T16 is detected, and in the fourth tracking error information selection means 38.40.42.51.52,
First and sixth tracking error information T obtained by reproducing the first and second tracking information areas ATFI and ATF2 of the first recording track TA for the first and second times.
, , T, and the first and second recording tracks TB of the second recording track TB.
The 11th and 16th tracking error information T8, TI& obtained by reproducing the tracking information areas ATFI and ATF2 for the third and fourth times are selected, and these are
The average value information CAT is detected by the average value detecting means 52 on average.
If the feeding speed of the magnetic tape 13 is controlled using
2A and 12B can be controlled so that they scan over the first and second recording tracks TA and TB in a substantially just tracking state.

Furthermore, third tracking error information detection means 36
．． 1st to 1st detected at 3τ 38.39.52
6 tracking error information T.

~Fifth tracking error information selection means 3 among T0
8.40.42.51.52, the first and sixth tracking error information T, , T6 and the eleventh and sixteenth tracking error information
By selecting the tracking error information Tll and T1 of , and selecting arbitrary two of these, T5 and T16, the fifth average value detection means 52 averages them to detect the average value information CATF. If the feeding speed of the magnetic tape 13 is controlled using this average value information CAa, the first and second
The rotary heads 12A and 12B can be controlled to scan the first and second recording tracks TA and TB in a substantially just tracking state.

G example An embodiment of the present invention will be described in detail below with reference to the drawings.

(Gl) Overall structure of DAT In FIG. 6, 10 indicates the overall structure of a rotating head type digital audio tape recorder (DAT), in which desired audio signals ADIN and ADOUT are provided on a rotating drum 11. Rotating head 12A, 12
B can be used to record and/or reproduce data on a magnetic tape 13 that is wound around the rotating drum 11 at predetermined angular intervals.

In this DATIO, first, the recording poet's power audio signal A D! N is input to the audio signal conversion circuit 14. The audio signal conversion circuit 14 has a low-pass filter and an analog-to-digital conversion circuit as a recording processing system, converts the input audio signals AD, , into digital data, and converts the input digital data DT into digital data.
, , and sent to the recording processing system of the digital signal processing circuit 15.

The recording processing system of the digital signal processing circuit 15 stores the input digital data DT, .
essme+wory) configuration is written to the memory circuit 16.

The recording processing system of the digital signal processing circuit 15 includes an error correction code generation circuit, an interleave processing circuit, an 8-10 modulation circuit, a parallel-to-serial conversion circuit, and the like.

As a result, the error correction code generation circuit first reads the input audio data DTAD written into the memory circuit 16, generates an error correction parity, and then writes the error correction parity into the memory circuit 16.

For all write and read processing to and from the memory circuit 16, addresses corresponding to data interleaving generated in the interleave processing circuit are selected, and input audio data DTAI, to which error correction parity has been added in this way, is 8=10. The modulation circuit reads out.

The 8-10 modulation circuit converts the input audio data DTAI, which is 8-bit data, into 10-bit data suitable for magnetic recording by the rotary heads 12A and 12B.
Synchronization signal, address signal, subcode signal, ATF
(autoa+atic track follow
ing) signals etc. are added.

The recording processing system of the digital signal processing circuit 15 converts the recording data obtained in this way into a recording signal S□ consisting of serial data in an internal serial-parallel conversion circuit. . and sends it to the recording processing system of the recording/reproduction amplification circuit 17.

The recording processing system of the recording/reproduction amplifying circuit 17 is composed of a recording signal amplifying circuit, a rotary transformer, etc., and receives the input recording signals S□,. Amplified recording signal 5IIt obtained by amplifying
CI is supplied to rotating heads 12A and 12B on rotating drum 11 via a rotary transformer.

In this way, the input audio signal A D t x can be recorded on a predetermined recording track of the magnetic tape 13 .

Here, in this DATl 0, input/display circuit 1
System control circuit 1 with microcomputer configuration from 8
Operation data D input to 9. The recording operation or the reproduction operation is selectively controlled based on the PI.

This human power/display circuit 18 is composed of, for example, a microcomputer having a key matrix as an operator input means, and a display panel having a liquid crystal display element as a display means.

As a result, the input/display circuit 18 outputs the operation data D in response to the user's operation of the operator. At the same time as outputting □, display data D 03 is input from the system control circuit 19.
The display on the display panel is performed based on F.

The system control circuit 19 also receives system information set in advance during recording and operation data D input from the input/display circuit 18. Mechanical control data DMC1, signal processing control data DCNA and servo processing control data D are generated based on the PI and sent to the mechanical control circuit 20, digital signal processing circuit 15 and servo processing circuit 21, respectively.

Actually, the servo processing circuit 21 during recording is the system control circuit 1.
Based on the servo processing control data DsIl input from 9, a drum drive signal CD11% capstan drive signal CCP and a reel drive signal CIIN are sent to the drum motor 22, capstan motor 23, and reel motor 24, respectively. is rotated at a predetermined number of rotations, and the magnetic tape 13 is run at a predetermined speed.

Also, at this time, the drum motor 22 and the capstan motor 2
3 and the reel motor 24 output the drum phase signal PGDl.
The drum frequency signal FG□, the capstan frequency signal FGゎ, and the reel frequency signal FG□ are each fed back to the servo processing circuit 21, thereby forming a speed servo and/or a phase servo, respectively.

Note that the servo processing circuit 21 is supplied with an internal reference signal D□ representing one interleave cycle during recording from the digital signal processing circuit 15, and as a result, the servo processing circuit 21 performs processing based on this internal reference signal D□a. A switching reference signal S for the rotary heads 12A and 12B is generated based on the drum phase signal PG□ and the drum frequency signal FC□ which are manually inputted.
The WP is sent to the digital signal processing circuit 15.

Moreover, this mechanical control circuit 20 is a system control circuit 1.
DA based on mechanical control data DMC input from 9.
In addition to driving and controlling the cassette loading mechanism of the T cassette and the tape loading mechanism of the magnetic tape 13, sensor information S is input from this mechanical mechanism part.
Mechanical information data D3Mc is generated based on the NC and sent to the system control circuit 19.

Here, in this DATIO, during reproduction, the servo processing circuit 21 first sets the rotation speed according to the servo processing control data Dff11 inputted from the system control circuit 19 and the internal reference signal D11 during reproduction supplied from the digital signal processing circuit 15). : The drum motor 22 is rotationally driven with a phase synchronized with F to form a speed servo and a phase servo.

In this state, the reproduced signal S□ is obtained from the rotating rods 12A and 12B. is a rotary transformer, a reproduction signal amplification circuit,
The amplified playback signal S PII is input to the playback processing system of the recording/playback amplification circuit 17 including the waveform equalization circuit, and as a result, the amplified playback signal S PII is
Z is supplied to the tracking control circuit 25, and reproduced digital signals S and □ obtained through the built-in binarization circuit are supplied to the reproduction processing system of the digital signal processing circuit 15.

In the case of DATIO, the tracking control circuit 25 performs tracking control by utilizing the ATF synchronization signal and ATF pilot signal formed on the recording track of the magnetic tape 13.

That is, the tracking control circuit 25 includes an equalizer circuit for detecting a synchronization signal and an ATF envelope detection circuit, and detects the ATF signal from the envelope detection signal based on the timing at which the synchronization signal is detected in the input reproduced digital signal 5PIII. is detected, an ATF fat control signal CATr is formed in accordance with this ATF signal, and sent to the servo processing circuit 21.

As a result, the servo processing circuit 21 receives the ATF control signal CAT.
An ATF servo loop is formed so that the capstan motor 23 is driven and controlled in accordance with the magnetic tape F, and thus the rotary heads 12A and 12B can accurately trace the recording track of the magnetic tape 13.

When the recording tracks of the magnetic tape 13 can be reproduced accurately in this way, the digital signal processing circuit 15
The reproduction processing system starts reproduction processing for the input reciprocating digital signal S□1.

The reproduction processing system of this digital signal processing circuit 15 is P
It is composed of a clock recovery circuit having a phase 1 locked 1 loop (LL) circuit configuration, a 10-8 demodulation circuit, an error detection and correction circuit, a deinterleave processing circuit, an interpolation circuit, and the like.

As a result, the digital signal processing circuit 15 first detects the reproduced clock signal included in the reproduced digital signal 5PII in the clock reproduction circuit.

When the 10-8 demodulation circuit detects a synchronization signal in the reproduced digital signal 5PBI, it generates the reproduced digital signal SP□ based on the reproduced clock signal detected by the clock reproduction circuit.
Demodulates 10 bits of 10-8, and the result is 8
The bit data is sequentially written into the memory circuit 16 as reproduced audio data DTAD.

The reproduced audio data DTAD written in the memory circuit 16 in this way is read out by the error detection and correction circuit to detect the presence or absence of a data error. The correction process is performed and the error-corrected data and the correction result are written into the memory circuit 16.

For all write and read processing for this memory circuit 16, addresses corresponding to the data deinterleave generated in the deinterleave processing circuit are selected.
The reproduced audio data DTAD after error detection and correction processing is read out by an interpolation circuit.

As a result, the interpolation circuit performs an interpolation calculation using a method such as calculating the average value of the data before and after the data for which error correction could not be performed, and converts this into the reproduced digital data D T
The signal is sent to the playback processing system of the audio signal conversion circuit 14 as an audio signal.

The reproduction processing system of the audio signal conversion circuit 14 includes a digital-to-analog conversion circuit and a low-pass filter,
The reproduced digital data DToot is converted into an analog signal, and this is sent out as a reproduced audio signal ADau.

In this way, the recording tracks of the magnetic tape 13 are transferred to the rotating drum 1.
The rotary heads 12A, 12B on the magnetic tape 13 read the recorded data and reproduce the recorded data recorded on the magnetic tape 13 to obtain a reproduced audio signal ADouy.

(G2) Tracking control circuit of the first embodiment In the first review, parts corresponding to those in FIG. 6 are denoted by the same reference numerals.
8 shows a tracking control circuit according to the first invention, in which the magnetic tape 13 drawn from the supply reel of the tape cassette is in fact transferred to the rotating drum 11 by the inclined guides 32A and 32B at 18 as described above with respect to FIG. 8(B).
It is wrapped over an angular spacing of 0 degrees.

Thereafter, the magnetic tape 13 is sandwiched between the pinch roller 33 and the capstan 34 and wound onto the take-up reel of the tape cassette.
1 to M-type loading.

In this embodiment, the rotating drum 11 has a diameter of 15 mm, and the rotating heads 12A, 12 have an angular spacing of 180 degrees.
The reproduction signal S PIG obtained by reproducing the recording tracks TA and TB on the magnetic tape 13 at B is the recording/reproduction amplifier circuit 1.
The signal is input to a reproduction signal amplification circuit 35 that constitutes the reproduction processing system No. 7.

As a result, the amplified reproduction signal S□2 obtained from the reproduction signal amplification circuit 35 is supplied to the ATF envelope detection circuit 36 and the equalizer circuit 37.

The ATF envelope detection circuit 36 includes a low-pass filter, detects the ATF envelope Eatr included in the amplified reproduction signal SPI12, and sends it to the analog-to-digital conversion circuit 38 that follows.

In addition, the equalizer circuit 37 equalizes the waveform of the amplified reproduction signal S□2 and supplies it to the ATF synchronization signal detection circuit 39, and the timing pulse TA? Fl. is supplied to the AND circuit 40.

In addition to this, the drum phase signal PCI) obtained through the drum PG/FG amplifier circuit 41 of the servo processing circuit 21
I and the drum frequency signal FC, , are generated by the SWP generation circuit 42
is input.

This SWP generation circuit 42 generates a switching reference signal SWP having one period for each rotation of the rotary heads 12A and 12B based on the drum phase signal PC□ and the drum frequency signal FC□.
is generated and inputted to the exclusive NOR circuit 43 together with the internal reference signal DIEF inputted from the digital signal processing circuit 15.

Thus, in the exclusive NOR circuit 43, the switching reference signal SWP and the internal reference signal DIEF are both logic rH,
Alternatively, during a period in which the logic level is "L", a logic output having the logic rHu level is supplied to the AND circuit 40 as the gate signal SGT.

As a result, the AND circuit 40 outputs the gate signal SGT to logic rH.
'' level, the timing pulse TATF10 of the ATF pilot signal is gated and input to the analog-to-digital conversion circuit 38 as a sampling pulse TAfF11.

As a result, the analog-to-digital conversion circuit 38 converts the ATF
The ATF envelope signal EITF inputted from the envelope detection circuit 36 is sampled at the timing of the sampling pulse TATFI+ inputted from the AND circuit 40, converted into digital data, and sent to the average value processing circuit 44 as ATF pilot data DTATF. do.

In fact, this sampling pulse TAT□1 is the first
(or second) recording track TA (or TB) to the first (or second) recording track TA (or TB).
Alternatively, when reproducing with the second) rotary head 12A (or 12B), the signal rises twice at a predetermined timing following the ATF synchronization signal on the recording track TA (or TB).

Therefore, by sampling the ATF envelope signal E ATF at the timing of this sampling pulse TA-TF11, the first (or second) recording track T
ATF pilot data DTATF is obtained by sampling A and TF pilot signals on recording tracks TB (or TA) arranged on both sides of A (or TB).

This average value processing circuit 44 has a microcomputer configuration, and sequentially detects ATF error data DT□ based on the ATF pilot data I)'r'arp input as described above, and also detects the ATF error data DT□.
During one cycle of the internal reference signal D□ input from 5,
This ATF error data DT! , I are cumulatively added, and this internal reference signal D is generated.

The average value data obtained by averaging every 01 cycle period is sent to the capstan servo processing circuit 45 as ATF control data CATF.

This capstan servo processing circuit 45 receives the capstan frequency signal FGcr obtained through the capstan motor FC amplifier circuit 46 of the servo processing circuit 21 as the capstan reference frequency signal CPII! The subtraction circuit 47 subtracts the result from F and inputs the result.

As a result, the capstan servo processing circuit 45
IIJ7B data CATF, capstan frequency signal F
A capstan drive signal CCP is generated in response to GCF and a capstan frequency reference signal CP ***.

This capstan drive signal CCP is supplied to the capstan motor 23 through the capstan drive circuit 48, and as a result, the feeding speed of the magnetic tape 13 is controlled.
Tracking control is performed using ATF recording areas ATFI and ATF2 recorded on recording tracks TA and TB on the magnetic tape 13.

In the above configuration, the capstan motor 23 is controlled to set the magnetic tape 13 to the same running speed as the first playback mode of the DAT consisting of a rotating drum with a diameter of 30 (m), and the rotational speed of the rotating drum 11 is adjusted to In the so-called second reproduction mode, which is set to twice the first reproduction mode of a DAT consisting of a 30 (mm) rotating drum, for example, as shown in Fig. 2 (A).
As shown in FIG.
1 scans the first recording track TA having the corresponding azimuth angle twice during the period of two rotations, and scans the first recording track TA twice during the period of 0 degrees to 180 degrees for each rotation. The recorded audio data of the playback signal SP□1, S
□Read as 0.

In this state, the first rotary head 12A scans the first recording track TA with a deviation of approximately one track pitch, so the envelope waveform of the first half of the reproduced signal SPIAI is similar to that when reproduced in a just tracking state. The second half of the reproduced signal S P
The IAZ envelope waveform has a low playback level.

Similarly, as shown in FIG. 2(B), the second rotary head 12B moves twice over the first recording track TB having the corresponding azimuth angle during the period in which the rotary drum 11 rotates twice.
The recorded audio data on the second recording track TB is read out as a reproduction signal SpH1% SpH12 during a period of 180 degrees to 360 degrees for each rotation.

Even in this state, the second rotary head 12B scans the second recording track TB with a deviation of approximately one track pitch, so when the envelope waveform of the second half reproduction signal S□3□ is reproduced in an approximately just tracking state. The first half of the reproduced signal S, the envelope waveform of □ has a low reproduction level.

In addition, in the case of such a second playback mode, FIG. 2(C)
As shown in (D), the switching reference signal SWP has a period corresponding to the rotation of the rotary drum 11, whereas the internal reference signal DIFF is recorded on the first and second recording tracks TA and TB. Since one recording unit (one interleave unit) of data is reproduced in two revolutions of the rotary drum 11, the period is twice that of the switching reference signal SWP.

In this state, the ATF synchronization detection circuit 39 of the tracking control circuit 30 outputs each reproduction signal 5FIA+, S□37, S□o1S, □2 included in the amplified reproduction signal SFIZ.
The timing pulse T of the first to eighth ATF synchronization signals during one period of the internal reference signal D□, according to the timing of the ATF synchronization signals of the ATF recording areas ATFI and ATF2.
11rFl. (T1 to TII (FIG. 2(E)) are sent to the AND circuit 40.

At this time, in addition to this, the AND circuit 40 also receives the switching reference signal SWP and the internal reference signal D11! During the period of 0 degrees to 180 degrees of the first rotation of the rotary drum 11 and 180 degrees to 360 degrees of the second rotation of the rotary drum 11, a gate signal SGA having a logic rH level is generated based on is input.

As a result, the AND circuit 40 receives the internal reference signal DIFF
The timing pulse TATFI of the first to eighth ATF synchronization signals during one period of . (T1~T,) as gate signal SG
As a result, the first, second, seventh, and eighth A
Timing pulses T, , T, and T7 of the TF synchronization signal
, TIl are supplied to the analog-to-digital conversion circuit 38 as a sampling pulse TATFII (FIG. 2(G)).

Thus, the analog-to-digital conversion circuit 38 samples the input ATF envelope signal [Eaty] at the timing of the input sampling pulse TA'rFI+, converts it into digital data, and converts it into digital data.
F pilot data DT, 7F (DT□, DTrz
and D T t 7, DT a,) to the average value processing circuit 44.

As a result, the average value processing circuit 44 inputs the first,
2nd, 7th, and 8th ATF pilot data D TT
,,DTa2 and DTt? , D T r s, the first, second, seventh, and eighth ATF error data DT□, , DT□2 and DT! 11.DT! l.

is detected and cumulatively added for one cycle period of internal reference signal DIlKF.

After this, the average value processing circuit 44 outputs one of the internal reference signals D□,
ATF error data DT□ cumulatively added for each cycle period
Divide by the value "4" to average it, and use the resulting average value data as ATF! It is sent to the capstan servo processing circuit 45 as a 1m data carry.

In this way, in this tracking control circuit 30, the DAT having the rotating drum 11 with a diameter of 15 (an)
Even when the L0 operates in the second playback mode, the rotary heads 12A and 12B read the magnetic tape 13 by using the ATF pilot signals recorded in the ATF recording areas ATFI and ATF2 of the recording tracks TA and TB. The corresponding recording tracks TA and TB can be scanned.

According to the above configuration, the rotating drum 1 with a diameter of 15 (am)
1, the rotary drum 11 is rotated at twice the rotation speed of the first reproduction mode of the DAT of the rotary drum with a diameter of 30 f:W), and the rotary heads 12A, 12B are rotated.
is the corresponding recording track TA.

Also in the second reproduction mode in which the TB is scanned twice each, the ATF recording areas ATFI, AT of the recording tracks TA, TB are read from the rotary heads 12A, 12B.
Among the first to eighth ATF pilot signals obtained by reproducing F2, the first, second, and seventh ATF pilot signals that are almost well reproduced
, the eighth ATF pilot signal, and this first,
By controlling the feeding speed of the magnetic tape 13 using the average value of the ATF error data DT□ obtained based on the second, seventh, and eighth ATF pilot signals, the rotary heads 12A and 12B can Recording track T
A tracking control circuit 30 that can perform tracking control on A and TB can be realized.

(G3) Tracking control circuit of second embodiment In FIG. 3, corresponding parts to those in FIG. To create the gate signal, the exclusive NOR circuit 4 of the tracking control circuit 30
3, a sampling location control circuit 51 having a microcomputer configuration is provided.

This sampling location control circuit 51 is the SWP generation circuit 4
2, and the internal reference signal D*** input from the digital signal processing circuit 15, the logic rH is set for a predetermined period at a preprogrammed timing. A gate signal 5GTI having a certain level is sent out.

In this embodiment, the sampling location control circuit 51 uses the internal reference signal 1 of lEF as shown in FIG.
During the cycle, the ATF recording area ATF? and AT of ATF2
Timing pulse TATFI of the first to eighth ATF synchronization signals according to the timing of the F synchronization signal. (Tt −Ts
(Fig. 2 (E)), the ATF recording areas ATFI of recording tracks TA and TB in the just tracking state
, a gate signal 5G that gates the first and eighth ATF pilot signals obtained in the same way as when regenerating ATF2.
Generates TI.

As a result, the AND circuit 40 outputs 1 of the internal reference signal D□2.
During the period, the timing of the first to eighth ATF synchronization signals is TATFI. (Tt -'rs) is gated with the gate signal SGf+, and as a result, the timing pulses T1 and T of the first and eighth ATF synchronization signals are analog The signal is supplied to a digital conversion circuit 38.

In this way, the analog-to-digital conversion circuit 38 samples the manually input ATF envelope signal EATr at the timing of the sampling pulse T^7, 1□, converts it into digital data, and averages it as ATF pilot data DTTI and DTTa. circuit 5
Send to 2.

As a result, the average value processing circuit 52 outputs the first and eighth ATF error data DT! according to the input first and eighth ATF pilot data DTT and DT7II. II
+ and DTE 118 and cumulatively add them during one cycle of the internal reference signal DIIEF.

After this, the average value processing circuit 52 outputs the internal reference signal D IIE
The ATF error data DT□ cumulatively added for each cycle of F is divided by the value "2" and averaged, and the average value data obtained as a result is ATFIIJ? It is sent to the capstan servo processing circuit 45 as I data CATF.

In this way, in this tracking control plate circuit 50, even when DATIO is in the second reproduction mode, the ATF recording areas ATFI, ATF2 of the recording tracks TA, TB are
The rotary heads 12A, 12B can scan the corresponding recording tracks TA, TB of the magnetic tape 13 by utilizing the ATF pilot signal recorded on the magnetic tape 13.

According to the above configuration, even when the DATl 0 operates in the second reproduction mode, the ATF recording areas ATFI, AT of the recording tracks TA, TB from the rotary heads 12A, 12B.
Among the first to eighth ATF pilot signals obtained by reproducing F2, gate the first and eighth ATF pilot signals reproduced in the same manner as in the just tracking state,
By controlling the feeding speed of the magnetic tape 13 using the average value of the ATF error data DT and R obtained based on the first and eighth ATF pilot signals, the rotating heads 12A and 12B can Recording track T
A tracking control circuit 50 that can control just tracking can be realized on A and TB.

(G4) Tracking control circuit of third embodiment FIG. 4, in which parts corresponding to those in FIG.
However, with respect to the first and second recording tracks TA and TB described above with reference to FIG. recorded magnetic tape 13
This shows the case of operating in a third playback mode in which a so-called soft tape is obtained.

In this embodiment, the rotating drum 11 with a diameter of 15 (m) is controlled to rotate at the same rotational speed as in the second reproduction mode described above, and the rotating heads 12A, 12 have an angular interval of 180 degrees.
B reproduces the recording tracks TAX and TBX on the magnetic tape 13 wound around the rotating drum 11 at angular intervals of 180 degrees.

Further, in this embodiment, the magnetic tape 13 is set to run at a speed 1.5 times that in the second playback mode by controlling the capstan motor 23.

In this state, for example, as shown in FIG. 4(A), the first rotary head 12A moves to the third recording track T having the corresponding azimuth angle during the period in which the rotary drum 11 rotates twice.
Scan twice on AX, each time from 0 degrees to 180 degrees per rotation.
During this period, the recorded audio data on the third recording track TC is read out as reproduction signals S□AXI-, S□At2.

In this state, the first rotary head 12A scans the third recording track TAX with a deviation of approximately one track pitch, so the envelope waveform of the first half of the reproduced signal S□AXI is similar to that when reproduced in a just tracking state. The second half of the reproduced signal S□
The reproduction level of the envelope waveform of AX□ becomes low.

Similarly, as shown in FIG. 4(B), the second rotary head 12B scans the fourth recording track TBX having the corresponding azimuth angle twice during the period in which the rotary drum rotates twice, The recorded audio data on the fourth recording track TBX is reproduced as signals S PIIBXI and S FIIIX during periods of 0180 degrees to 360 degrees per rotation, respectively.
Read as 2.

Even in the second state, the second rotary head 12B scans the fourth recording track T''BX with a deviation of about one track pitch, so the envelope waveform of the reproduced signal 30□2 in the second half is almost exactly in alignment. The reproduced signal S in the first half has a waveform similar to that when reproduced in the
The reproduction level of the PIIIXI envelope waveform is reduced.

In addition, in such a third reproduction mode, as shown in FIG. 4(C) and CD), the switching reference signal SWP has a period corresponding to the rotation of the rotary drum 11, whereas the internal reference signal D□ , is the switching reference signal SWP 2 because data of about one recording type (one interleave unit) recorded on the third and fourth recording tracks T A X and TBX is reproduced by two revolutions of the rotary drum 11 It has twice the period.

In this state, the ATF synchronization detection circuit 39 of the tracking control circuit 50 outputs each reproduction signal S PIAXI s S pm@x+, S included in the amplified reproduction signal SPO.
ATF recording area A of pmaxz, S p+++sxz
During one period of the internal reference signal I) tty, the first to eighth
Timing pulse TA of ATF synchronization signal? FlO(T
I-Ts (FIG. 4(E)) is sent to the AND circuit 40.

At this time, the AND circuit 40 is controlled by the sampling location control circuit 51 to record A of the recording tracks TAX and TBX in the just tracking state as shown in FIG. 4(F).
A gate signal SGT□ is generated to gate the first and eighth ATF pilot signals obtained in the same manner as when reproducing the TF recording areas ATFI and ATF2.

As a result, the AND circuit 40 outputs 1 of the internal reference signal D□7.
During the period, the timing pulse T'ayr+ of the first to eighth ATF synchronization signals. (T, ~Tl1) as gate signal SG
As a result, the timing pulses T and T of the first and eighth ATF synchronization signals are supplied to the analog-to-digital conversion circuit 38 as the sampling pulse T'Ayyzo (FIG. 4(G)). .

Thus, the analog-to-digital conversion circuit 38 converts the input ATF envelope signal EATF into a sampling pulse TA1F□. It is sampled and converted into digital data at the timing of , and sent to the average value processing circuit 52 as ATF pilot data DT and DTT.

As a result, the average value processing circuit 52 receives the first and eighth ATF pilot data DTTI and DTTl that are sequentially input.
According to +, the first and eighth ATF error data DT□
1 and DTEIIIll are detected and cumulatively added for one cycle period of the internal reference signal D_RtF.

After this, the average value processing circuit 52 outputs 1 of the internal reference signal D□2.
ATF error data DT□ cumulatively added for each cycle period
Divide by the value "2" to average it, and use the resulting average value data as ATFIIl? It is sent to the capstan servo processing circuit 45 as il data CATF.

In this way, in this tracking control circuit 50, even in the third playback mode, the recording track TAX,
Using the ATF pilot signals recorded in the ATF recording areas ATFI and ATF2 of the TBX, the rotary head 1
2A and 12B can scan the corresponding recording tracks TAX and TBX of the magnetic tape 13.

According to the above configuration, even when DATl 0 is in the third reproduction mode, the tracking control circuit can perform tracking control so that the rotating heads 12A and 12B accurately trace the corresponding recording tracks TAX and TBX. 50
can be realized.

(G5) Tracking control circuit of the fourth embodiment FIG. 5, in which parts corresponding to those in FIG.
O sets the magnetic tape 13 to 1/1 for the second playback mode.
A case is shown in which the vehicle operates in a so-called fourth regeneration mode in which the vehicle travels at twice the travel speed.

In the case of this embodiment, the rotating drum 11 with a diameter of 15 [cabin] is controlled to rotate at the same rotational speed as in the second reproduction mode described above, and the rotating heads 12A, 12 have an angular interval of 180 degrees.
B reproduces recording tracks TA and TB on a magnetic tape 13 wound around a rotating drum 11 at an angular interval of 180 degrees.

In addition, in this embodiment, by controlling the capstan motor 23, the magnetic chip 113 is set to 1 for the second reproduction mode.
/The car is set to run at twice the speed.

In this state, for example, as shown in FIG. 5(A), the first rotary head 12A moves to the first recording track T having the corresponding azimuth angle during the period in which the rotary drum 11 rotates four times.
A is scanned four times, and the recorded audio data on the first recording track TA is converted into the first, second, third, and fourth reproduction signals S during a period of 0 degrees to 180 degrees for each rotation. □□.

, 5PIAII, 5PIAI! , 5PIAI3.

In this state, the first rotary head 12A scans the first recording track TA with a deviation of approximately 1/2 track pitch, so that the first reproduction signal S, the first half of □1° and the second reproduction signal While the envelope waveform of the second half of S PIIAI + has a waveform that is close to that when reproduced in a state of just tracking, the envelope waveforms of the third and fourth reproduction signals 5FIIAI2 and 5PIIAI4 have a low reproduction level.

Similarly, as shown in FIG. 5(B), the second rotary head 12B moves four times over the second recording track TB having the corresponding azimuth angle during the period in which the rotary drum 11 rotates four times.
The audio data recorded on the second recording track TB is scanned once, and the recorded audio data on the second recording track TB is converted into the first, second, third, and fourth reproduction signals S PII during a period of 180 degrees to 360 degrees for each rotation.
IIO% 5PIII %5PIIIZ , S□□
, read out as .

Even in this state, the second rotary head 12B scans the second recording track TB with a deviation of approximately 1/2 track pitch, so that the first half of the third reproduction signal s0□2 and the fourth reproduction signal S□ The second half of the envelope waveform of □ and has a waveform that is close to that when reproduced in a nearly just tracking state, whereas the first and second reproduced signals S□□
. , Spa□, the reproduction level of the envelope waveforms becomes low.

Note that in such a fourth reproduction mode, as shown in FIGS. 5(C) and (D), the switching reference signal SWP has a period corresponding to the rotation of the rotary drum 11, whereas the internal reference signal DI ! F is the first and second recording track TA and T
Since one recording unit (one interleave unit) of data recorded in B is reproduced by four rotations of the rotary drum 11, the period is four times as long as the switching reference signal SWP.

In this state, the ATF synchronization detection circuit 39 of the tracking control circuit 50 outputs each reproduction signal SPIIAI included in the amplified reproduction signal S□2. , S□□. , 5PIIAII
% SPI□I, 5FBAI□, 5PIII11□
, S□A13, SPB□, ATF recording area ATFI
and the internal reference signal DI! according to the timing of the ATF synchronization signal of ATF2. During one cycle of F, the 1st to 16th A
TF synchronization signal timing pulse TATF3゜('r+
~T16 (FIG. 5(E)) is sent to the ant circuit 4°.

Note that, in practice, the reproduced signals S PIIAI 3 and S□□.

The timing pulses T4 and Tlff of the fourth and thirteenth ATF synchronization signals are not sent out because the reproduction level is low in the ATF recording areas ATFI and ATF2 included in the ATF recording areas ATFI and ATF2.

At this time, the AND circuit 40 has a signal obtained by the sampling location control circuit 51 in the same manner as when the ATF recording areas ATFI and ATF2 of the recording tracks TA and TB are reproduced in the just tracking state as shown in FIG. 5(F). A gate signal Seti is generated to gate the first, sixth, eleventh, and sixteenth ATF pilot signals.

As a result, the AND circuit 40 outputs the internal reference signal D II! F
During one cycle of the timing pulse T ATF :l of the first to sixteenth ATF synchronization signals. (T, ~T1.) with the gate signal Sr,A, and as a result, the first and sixth
, 11th, and 16th ATF synchronization signal timing pulses T+, Tb, T'++, and T are supplied to the analog-to-digital conversion circuit 38 as a sampling pulse TATF4° (FIG. 5(G)).

Thus, the analog-to-digital conversion circuit 38 converts the input ATF envelope signal E,A, into a sampling pulse TA? It is sampled at the timing of F4° and converted to digital data, which is converted into ATF pilot data DT, , DT, , DT, , DT, DT A7. It is sent to the average value processing circuit 52 as the average value processing circuit 52.

As a result, the average value processing circuit 52 inputs the first,
6th, 11th, 16th ATF pilot data DTT
,,DTT6,DT71. , DT, , the first
, 6th, 11th, 16th ATF error data DT, □,
DTt*5, DT□, 1, DT! □, and also detects this as an internal reference signal I) i! It is cumulatively added during one cycle period of a.

After this, the average value processing circuit 52 outputs one of the internal reference signals DI.
ATF error data DT□ cumulatively added for each scrap period
is averaged by dividing by the value "4", and the average value data obtained as a result is sent to the capstan servo processing circuit 45 as ATF control data CATF.

In this way, in this tracking control circuit 50, even in the fourth playback mode, the recording track TAST
A recorded in ATF recording areas ATFI and ATF2 of B
By diverting the TF pilot signal, the rotary head 12A
, 12B is the corresponding recording track TA of the magnetic tape 13
, TB can be scanned.

According to the above configuration, even when DATIO is in the fourth reproduction mode, the tracking control circuit 50 can perform tracking control so that the rotating heads 12A and 12B accurately trace the corresponding recording tracks TA and TB. can be realized.

(G6) Tracking control circuit of fifth embodiment The fifth embodiment is a case where the DATl 0 having the tracking control circuit 50 according to the second embodiment operates in the fourth reproduction mode as in the fourth embodiment. shows.

In the second embodiment, the sampling location control circuit 51
As shown in Figure (H), the ATF recording areas ATFI, ATF of the recording tracks TA and TB in the just tracking state
1st and 16th A obtained in the same way as when playing 2
Gate signal S GT4 that gates the TF pilot signal
occurs.

As a result, the AND circuit 40 uses the timing pulse TATF3° (T, ~T, , ) of the first to sixteenth ATF synchronization signals as the gate signal S for one period of the internal reference signal D REF.
gated with GT4, resulting in the 1st and 16th ATF
The timing pulses T1 and TI6 of the synchronization signal are supplied to the analog-to-digital conversion circuit 38 as a sampling pulse TATF5° ((■) in FIG. 5).

Thus, the analog-to-digital conversion circuit 38 converts the input ATF envelope signal E,A into a sampling pulse TATFS. The sample is sampled at the timing of
Send to.

As a result, the average value processing circuit 52 generates the first and sixteenth ATF error data D according to the first and sixteenth ATF pilot data DTTl and DTa, b that are sequentially input.
TE□ and DT, .

After this, the average value processing circuit 52 uses the internal reference signal D ItF
ATF error data D cumulatively added every cycle period of
T! Ill is divided by the value "2" and averaged, and the average value data obtained as a result is sent to the capstan servo processing circuit 45 as ATF control data CATF.

In this way, in this tracking control circuit 50, even in the fourth reproduction mode, the recording tracks TA, T
A recorded in ATF recording areas ATFI and ATF2 of B
By diverting the TF pilot signal, the rotary head 12A
, 12B is the corresponding recording track TA of the magnetic tape 13
, TB can be scanned.

According to the above configuration, even when DATIO is in the fourth playback mode, the rotary head 12 can be moved with even higher accuracy.
It is possible to realize a tracking control circuit 50 capable of performing tracking control so that A and 12B accurately trace the corresponding recording tracks TA and TB.

(G7) Other embodiments (1) In the embodiments described above, the ATF error signal is converted to digital data and tracking control is performed using the average value for each recording unit, but the present invention has the following steps instead.
(2) Even if the average value is calculated for each recording track or for a predetermined number of tracks, the same effect as in the above embodiment can be achieved.

(2) In the above embodiment, the timing pulse of the ATF pilot signal according to the timing of the ATF synchronization signal is gated to obtain desired ATF pilot data, but the present invention provides an alternative to this. ,
ATF pilot data may be obtained using the timing pulse of the ATF pilot signal, and then processing may be performed using only desired ATF pilot data.

(3) In the above-described embodiment, the present invention was applied to a tracking control circuit of a rotary head type digital audio tape recorder, but the present invention is not limited to this, and the present invention is applicable to magnetic tapes such as video tape recorders, data recorders, etc. Wrapping it around a rotating drum is suitable for wide application in tracking control circuits of magnetic recording and/or reproducing devices that perform helical scanning with a rotating head.

Effects of the Invention H As described above, according to the first invention, the first and second tracking information areas formed in the first and second recording tracks of the magnetic tape are sequentially and alternately reproduced and detected. Among the first to eighth tracking error information corresponding to one recording unit of recording data, the first, second, seventh, and eighth tracking error information are averaged to detect average value information. Therefore, if the feeding speed of the magnetic tape is controlled using this average value information, even in the second playback mode, the first and second rotating heads
It is possible to realize a tracking control circuit that can control the recording track to be scanned in a substantially just tracking state.

According to the second invention, among the first to eighth tracking error information, the first or second tracking error information and the seventh or eighth tracking error information are averaged to detect average value information. Accordingly, in the second playback mode, the tracking control circuit is capable of controlling the first and second rotary heads to scan the first and second recording tracks in a substantially just tracking state with an even higher precision. can be realized.

Furthermore, according to the third invention, the first and second magnetic tape
One recording unit is recorded by sequentially and alternately reproducing the first and second tracking information areas formed in the third and fourth recording tracks having a track pitch 1.5 times that of the recording track. The first detected according to the data
- The first and eighth tracking error information of the eighth tracking error information
Since the average value information is obtained by averaging the tracking error information of It is possible to realize a tracking control circuit that can control the rotary head to scan the third and fourth recording tracks in a substantially just tracking state.

Furthermore, according to the fourth invention, the first and second recording tracks formed on the first and second recording tracks of the magnetic tape, respectively.
Of the first to sixteenth tracking error information detected according to one recording unit of recorded data by sequentially and alternately reproducing the tracking information areas of
By averaging the tracking error information of No. 6 and detecting the average value, if the magnetic tape feeding speed is controlled using this average value information, even in the fourth playback mode, the first tracking error information can be detected. Also, it is possible to realize a tracking control circuit that can control the second rotary head to scan the first and second recording tracks in a substantially just tracking state.

Furthermore, according to the fifth invention, the first and second recording tracks formed on the first and second recording tracks of the magnetic tape, respectively.
The first, sixth, eleventh, and sixteenth pieces of tracking error information are selected from the first to sixteenth pieces of tracking error information that are detected according to one recording unit of recorded data by sequentially and alternately reproducing the tracking information areas of Any 2 of the tracking error information
By selecting one and detecting the average value information, if this average value information is used to control the feeding speed of the magnetic tape, the first Also, it is possible to realize a tracking control circuit that can control the second rotary head to scan the first and second recording tracks in a substantially just tracking state.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing one embodiment of a tracking control circuit according to the present invention, FIG. 2 is a timing chart for explaining its operation, and FIG. 3 is a block diagram showing a tracking control circuit according to another embodiment. FIG. 4 is a timing chart for explaining its operation, FIG. 5 is a timing chart for explaining the operation of a tracking control circuit according to another embodiment, and FIG. 6 is a diagram showing the overall configuration of a rotary head type digital audio tape recorder. 7 is a route map for explaining the recording tracks on a magnetic tape in the DAT format. FIG. 8 is a route map for explaining the diameter of the rotating drum and the winding angle of the magnetic tape. 1 is a timing chart for explaining a conventional tracking control method using the ATF method. 1.13...magnetic tape, 2.2A, 2B11
2AS 12B・・・Rotating head, 3.4.11
... Rotating drum, 10 ... Rotating head type digital audio tape recorder, 17 ...
...Recording/reproduction amplification circuit, 21... Servo processing circuit, 25... Tracking control circuit, 30.5
0...Tracking control circuit, 35...
- Reproduction signal amplification circuit, 36...ATF envelope detection circuit, 37...Equalizer circuit, 38
...Analog-digital conversion circuit, 39...
...ATF synchronization signal detection circuit, 40...AND circuit, 42...SWP generation circuit, 43...
...Exclusive Pnoah circuit, 44.52...
. . . Average value processing circuit, 51 . . . Sampling location control circuit. Agent Keiichi Tanabe 3rd Actual A-column O Toukinku System #Movement In Dream Diagram DAT 7 *a Tra-Tsuku by Oman To (A) CB) 0 Desist Dokum Scratching Magnetism Thea Fee 1 Sun Kura 0 viewing naked playback signal f
)ATF”i Imbling Timing School Diagram

Claims (5)

[Claims] (1) First and second magnetic tapes are formed at different azimuth angles in a diagonal direction with respect to the running direction of a magnetic tape that is wound around a rotating drum that rotates at a first rotational speed and runs at a first running speed. Record data for one recording unit is recorded on the magnetic tape by scanning the recording track once with each of first and second rotary heads having corresponding azimuth angles and disposed on the rotary drum. For a first reproduction mode in which the rotational speed of the drum is rotated at a second rotational speed that is twice the first rotational speed, the first and second recording tracks are In a tracking control circuit of a magnetic recording and reproducing apparatus that operates in a second reproducing mode in which the recording data for one recording unit recorded on the magnetic tape is obtained by scanning twice with each of the two rotating heads, the magnetic The first and second tracking information areas formed in the first and second recording tracks of the tape are sequentially and alternately reproduced to record the first to eighth tracking information areas corresponding to the one recording unit of the recorded data. a first tracking error information detection means for detecting the tracking error information of the first recording track, of the first to eighth tracking error information obtained from the first tracking error information detection means; First and second tracking error information obtained by reproducing the first and second tracking information areas for the first time, and reproducing the first and second tracking information areas of the second recording track for the second time. a first tracking error information selection means for selecting the seventh and eighth tracking error information obtained by , a first average value detection means for detecting average value information by averaging the eighth tracking error information, and controlling the feeding speed of the magnetic tape using the average value information, and controlling the feeding speed of the magnetic tape in the second playback mode. A tracking control circuit characterized in that, at times, the first and second rotary heads scan the first and second recording tracks in a substantially just tracking state. (2) In the tracking control circuit of the magnetic recording and reproducing apparatus that operates in the second reproduction mode, first and second tracking information areas are formed in the first and second recording tracks of the magnetic tape, respectively. a first tracking error information detecting means for detecting first to eighth tracking error information corresponding to the one recording unit of the recorded data by sequentially and alternately reproducing the recorded data; Among the first to eighth tracking error information obtained from the means, the first or second tracking error information obtained by first reproducing the first or second tracking information area of the first recording track a second tracking error information selection for selecting tracking error information and the seventh or eighth tracking error information obtained by reproducing the first or second tracking information area of the second recording track for the second time; and a second average value detection for detecting average value information by averaging the first or second and seventh or eighth tracking error information selected by the second tracking error information selection means. means for controlling the feeding speed of the magnetic tape using the average value information so that the first and second rotary heads move over the first and second recording tracks during the second playback mode. A tracking control circuit characterized in that scanning is performed in an almost straight tracking state. (3) In the first reproduction mode, the rotating drum is rotated at a second rotation speed that is twice the first rotation speed, and the magnetic tape is rotated at the first running speed. The third and fourth recording tracks are formed at a track pitch 1.5 times that of the first and second recording tracks. A tracking control circuit of a magnetic recording and reproducing device having a third reproducing mode in which the first and second rotary heads scan twice each to reproduce one recording unit of the recorded data recorded on the magnetic tape, The first and second tracking information areas formed in the third and fourth recording tracks of the magnetic tape are sequentially and alternately reproduced, and the first to second tracking information areas corresponding to the one recording unit of the recording data are reproduced. a second tracking error information detection means for detecting eighth tracking error information; and a second tracking error information detection means for detecting eighth tracking error information;
The first tracking information area of the recording track of
A third method for selecting the first tracking error information obtained by reproducing the first tracking error information for the second time and the eighth tracking error information obtained by reproducing the second tracking information area of the fourth recording track for the second time. tracking error information selection means; and third average value detection means for detecting average value information by averaging the first and eighth tracking error information selected by the third tracking error information selection means. The average value information is used to control the feeding speed of the magnetic tape, so that the first and second rotary heads move approximately on the third and fourth recording tracks during the third playback mode. A tracking control circuit characterized in that scanning is performed in a tracking state. (4) In the first reproduction mode, the rotating drum is rotated at a second rotation speed that is twice the first rotation speed, and the magnetic tape is rotated at the first running speed. The magnetic tape was recorded on the magnetic tape by scanning the first and second recording tracks four times each with the first and second rotary heads. In a tracking control circuit of a magnetic recording and reproducing device having a fourth reproduction mode for reproducing one recording unit of the recorded data, first and second recording tracks formed in the first and second recording tracks of the magnetic tape, respectively, a third tracking error information detecting means for sequentially and alternately reproducing the two tracking information areas and detecting first to sixteenth tracking error information corresponding to the one recording unit of the recorded data; Among the first to sixteenth tracking error information obtained from the tracking error information detection means,
The first and sixth tracking error information obtained by reproducing the first and second tracking information areas of the first recording track for the first and second times, and the first and sixth tracking error information of the second recording track. a fourth tracking error information selection means for selecting eleventh and sixteenth tracking error information obtained by reproducing the second tracking information area for the third and fourth times; and a fourth average value detection means for detecting average value information by averaging the selected first, sixth, eleventh, and sixteenth tracking error information, and using the average value information to detect the above-mentioned tracking error information. The feeding speed of the magnetic tape is controlled so that the first and second rotary heads scan the first and second recording tracks in a substantially just-tracking state during the fourth playback mode. A tracking control circuit featuring: (5) In the tracking control circuit of the magnetic recording and reproducing device having the fourth reproduction mode, sequentially controlling the first and second tracking information areas formed in the first and second recording tracks of the magnetic tape, respectively. a third tracking error information detection means for alternately reproducing and detecting first to sixteenth tracking error information corresponding to the one recording unit of the recorded data; Of the above-mentioned first to sixteenth tracking error information,
The first and sixth tracking error information obtained by reproducing the first and second tracking information areas of the first recording track for the first and second times, and the first and sixth tracking error information of the second recording track. a fifth tracking error information selection means for selecting eleventh and sixteenth tracking error information obtained by reproducing the second tracking information area for the third and fourth times; and fifth average value detection means for selecting any two of the first, sixth, tenth and sixteenth tracking error information and detecting the average value information. , the feeding speed of the magnetic tape is controlled using the average value information, and in the fourth reproduction mode, the first and second rotary heads move approximately on the first and second recording tracks in a straight track. A tracking control circuit characterized in that scanning is performed in a king state.