JPH03216846A - Rotating head system magnetic recording and reproducing device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a rotary head type magnetic recording and reproducing device, particularly a digital audio table recorder.

BACKGROUND OF THE INVENTION In recent years, technological progress regarding magnetic recording and reproducing devices has been remarkable, and even in the audio field, higher performance and higher sound quality have been pursued. Among these, a rotary head type magnetic recording/reproducing device as a next generation tape recorder has been proposed and commercialized as a digital audio tape recorder (hereinafter referred to as R-DAT).

On the other hand, when attempting to perform so-called editing operations, such as connecting music signals on a tape, consideration must be given to preventing the generation of abnormal sounds, but in general, the sound that gradually attenuates near the editing point is necessary. It is common to use a method of overlapping gradually increasing sounds, that is, cross-fade processing.

However, in a rotary head type magnetic recording/playback device, when editing music signals digitally recorded on a tape while performing cross-fade processing, the head that plays the data in advance and the head that plays back the data after the cross-fade processing is performed. , it becomes necessary to have a configuration equipped with a head for subsequent recording to rewrite on the same track.

Hereinafter, as a conventional example, a rotary head type magnetic recording and reproducing apparatus having a configuration that satisfies such specifications will be described with reference to the drawings. FIG. 2 is a plan view showing the arrangement of the rotary cylinder, rotary head, and magnetic tape, and FIG. 3 is a front view showing the height relationship between the rotary heads arranged on the rotary cylinder. FIG. 4 is a diagram showing a magnetic tape pattern on which servo signals are arranged and recorded by a time-division method, viewed from the magnetic material side, and also shows the mutual positional relationship between the preceding reproducing head, the following recording head, and the rotating cylinder. . FIG. 5 is a diagram for explaining how the magnetic head is controlled in accordance with servo signals on the tape. FIG. 6 is a detailed explanatory diagram of a track pattern for explaining that information signals such as music and servo signals are arranged and recorded by time division.

In FIGS. 2 and 3, 1 is a rotating cylinder, 2a,
Preliminary playback head 2, in which two rotary heads with different 2-bit azimuths are mounted 180 degrees opposite each other.
a' and 2b' indicate similarly attached post-recording heads. In addition, the preceding playback head 2 a + 2 b
is for the trailing recording head 2 a' + 2 b'',
It delays the phase by an offset angle of Φ, and is mounted above with a step h as shown in FIG. G represents the gap of rotation/sodo 1 Twt
++ T−^ indicates the track width of the preceding reproducing head and the trailing recording head, respectively.

In FIG. 4, 2b is a negative azimuth advance playback head, 2b' is a negative azimuth follow-up recording head, and 8 tracks apart are tra-soku lo+rr.
Each of them is built into the rotating cylinder 1 so as to face the magnetic tape 3 on the Lo.

At this time, the preceding reproducing head 2b runs on the track l0, and the adjacent track 11. 12 and a part of their track widths are in contact with each other. Similarly, the trailing recording head 2b
' runs on the track m0, and the adjacent track m++
Both m2 and part of the track width are in contact with each other by ε and β, respectively. Qi. Q+, q2 and I)9,
pl. p2 is a servo signal for tracking control of the rotary head incorporated in the track Is+IIs 12 by time division.

FIG. 5(a) shows a conceptual diagram in which tracking is controlled by the servo signal ps+ pI11)2 when the preceding reproducing head 2b runs on the track l0, and f,
is a pilot signal for realizing a control operation, and f2 is a timing signal for extracting a control signal from an adjacent track. Represents the reproduced playback signal, Vs is Tora Sok l0, ■, Kaitrak lI
, V2 shows the signal reproduced from the tora sok l2. By the way, according to the R-DAT format, 1
The information data area of the book, such as music, time,
It is divided into additional information such as song number, etc., servo signal engineer 1 Noah for accurate tracking, etc.

In FIG. 6, Ds++ Ds2 is an additional information area (subcode area) on the input side and output side, D is an information data area for music, etc., p. q indicates the servo signal area on the input side and output side, respectively, and is 0.

01 to G4 are no-signal portions provided at the switching portions of these areas.

The operation when performing an editing operation in the rotary magnetic recording/reproducing apparatus constructed as described above will be explained.

In FIG. 4, the music data on the magnetic tape 3 is read by the advance playback head 2b.

At this time, the magnetic tape 3 and the rotary cylinder 1 are connected to the servo signals pa+pI,p read from the preceding reproducing head 2b.
Tracking control is performed by 2 and q@+ Q++ qe, and the feeding of the magnetic table 3 and the rotational phase of the rotary cylinder 1 are locked. That is, as shown in FIG. 5(a), the preceding reproducing head 2b running on the track l@ is located at the adjacent track 11. 12 is also regenerated, and the regenerated pilot signal V9.12 shown in FIG. 5(b) is generated. Extract VI and V2. Then, the servo works to equalize the levels of vI and V2. By such an operation, the advance playback head 2
b runs in the center of track 1lI. By the way, when performing an editing operation, the data of track llI reproduced from the preceding playback head 2b is subjected to error correction, fade-out processing, mixed with fade-in processed external data, an error correction code is added, and The track 1a read by the reproducing head is rerecorded by the follow-up recording head 2b'. These processes are performed within the time it takes for track l@ to move to track m@. On the other hand, as shown in FIGS. 2 and 3, the preceding reproducing head 2b delays the phase of the following recording head 2b' by an offset angle Φ, and is mounted above with a step h. Therefore, the preceding playback head 2b is on track l. When running at the center of
b" runs on a track ms eight tracks apart. At this time, depending on the value of the track width TII11 of the trailing recording head 2b and the value h of the installation step between the preceding reproduction head 2b and the trailing recording head 2b', the adjacent track Damages ε and β are caused on m++ me, respectively, and unerased parts are left on the rewritten track ms.When track m is damaged due to ε, it is the track at the end of editing, and due to β, track m is damaged. When m2 is damaged, it is the track where editing begins, and there is a high possibility that the error rate will worsen.Furthermore, as shown in Figure 6, the editing operations are performed on the input and exit tracks. Information areas (subcode areas) Ds+, Ds2 and information data area D for music, etc., and non-signal areas G1, G4 or G2, G3 are provided at the switching parts of each data, and each data including servo signals p and q is provided. In FIG. 4, the trailing recording head 2b'
The timing of the signal written by is delayed by the mounting angle Φ and the step height h with reference to the data reproduced by the preceding reproduction head 2b. Therefore, the accuracy of the data writing position and writing end position is greatly influenced by the mounting angle Φ of the preceding reproduction head 2b and the subsequent recording head 2b' arranged on the rotary cylinder 1, and the accuracy of the step h. come.

Problems to be Solved by the Invention However, in the above conventional configuration, the preceding playback head 2b
is track 1. When running on the center of the trailing recording head 2b', the trailing recording head 2b' runs on track m8 eight tracks apart, but the value of the track width Tua of the trailing recording head 2b' and the value of the trailing recording head 2b and trailing recording head 2b' are different. Depending on the value h of the mounting step, damage of ε and β may be caused on the adjacent track rrl++m2, respectively, or unerased portions may be left on the rewritten track ms. When track m+ is damaged by ε, it is the track at the end of editing, and when track m2 is damaged by β, it is the track at the start of editing.Furthermore, ε and β take negative values, and rewrite track m9 is When damaged, there are problems such as a worsening of the error rate over the entire edited track. Alternatively, the signal written by the trailing recording head 2b' may be transmitted to the trailing recording head 2b'.
Based on the data reproduced by b, the timing is adjusted by delaying the time by the mounting angle Φ and the step h. Depending on the accuracy of the mounting angle Φ of 2b' and the step h, the accuracy of the data writing position and writing end position is greatly affected, and the additional information area (subcode area) Ds+.
There have been many problems such as interference between the servo signal areas p and q on the input side and output side of the information data area D1 such as Ds2 and music.

The present invention solves the above-mentioned problems of the conventional art.
'2b' installation step value h) installation angle value Φ,
It is an object of the present invention to provide a rotating head type magnetic recording/reproducing device that guarantees editing functions without being affected by assembly accuracy.

Means for Solving the Problems In order to achieve this object, the rotary head-on type magnetic recording and reproducing apparatus of the present invention provides information signals and tracking control of the rotary head to each track on the tape recorded and reproduced by the rotary head.・In a magnetic recording/reproducing device, there is a pre-reproducing head that reproduces data from the track in advance in timing, and a pre-reproducing head that reproduces data from the track in advance in terms of timing. A trailing recording head performs fade processing on the data reproduced by the changing head, and then re-records on the same track, and a track where the servo signal is recorded by using the trailing recording head divided in time. During the period of contact with the position, the servo signal is read by functioning as a reproducing head, and tracking control of the rotary cylinder is performed using the reproduced servo signal.

According to the present invention, with the above-described configuration, the tracking control of the rotary cylinder is performed by the follow-up recording head, and as a result, the value of the track width of the follow-up recording head and the mounting level difference between the preceding playback head and the follow-up recording head are controlled. The error rate characteristics near the editing point are satisfied without being affected by the assembly accuracy of the rotating cylinder, such as the value of the mounting angle.

EXAMPLE Hereinafter, an example of the present invention will be described with reference to the drawings.

FIG. 1 shows a magnetic tape pattern viewed from the magnetic body side in a rotary head type magnetic recording/reproducing device according to an embodiment of the present invention, and also shows the mutual positional relationship between a preceding reproducing head and a subsequent recording head, etc. It is something that

In FIG. 1, 2b indicates a preceding reproduction head, and 2b' indicates a subsequent recording head. The preceding playback head 2b is
Similar to the conventional example shown in FIGS.
The recording head 2b' is located above the trailing recording head 2b' and is delayed in phase by an offset angle Φ, and is mounted above with a step h. Furthermore, advance playback head 2
It is also the same as in the conventional example that the trailing recording heads 2b'' and 2b'' are installed so as to face the magnetic tape 3 on tracks 1., m0, which are eight tracks apart.Tp indicates the track pitch. It is approximately 13.591μ according to the R-DAT format.Tus+ TIJ
I! 1 indicates the track width of the preceding reproduction head P 2 b and the trailing recording head 2b', respectively, and the track width Ties of the preceding reproduction head 2b is approximately 1.5 times the track pitch Tp, and that of the trailing recording head 2b'. Track width T u
a is set approximately equal to the track pitch Tp.

Also. Qa, Q++ Qp and Pg. P++
P2 is a servo signal for tracking control of the rotary head recorded in time-divided manner in tracks ma, ml+m2. At this time, the trailing recording head 2b' runs on the track m0, and also runs on the adjacent track m+t.
Both m2 and part of the track width are in contact with each other by ε and β, respectively. Similarly, the preceding playback head 2b runs on the track l0 eight tracks away, and also runs on the adjacent track l0.
1. 12, a part of the track width is α,
They are in contact by γ.

The operation of the rotary head type magnetic recording/reproducing apparatus of this embodiment configured as described above will be explained below.

When performing an editing operation, the data of the 1ll track played by the advance playback head 2b is subjected to error correction, fade-out processing, mixed with fade-in processed external data, an error correction code is added, and the data is reproduced by the advance playback head 2b. The follow-up recording head 2b' rerecords on the same track la that was read by the head 2b. These processes are performed within the time it takes for track 1@ to move to track ms, which is the same as in the conventional example, but magnetic tape 3
The feed and the rotational phase of the rotary cylinder 1 are the servo signal Qθ+ Q++ read from the trailing recording head 2b'.
Q2 and Pi! , P1, P2 and locked. The way the servo is applied is the same as in the conventional case shown in FIGS.
Since it functions as a reproducing head only during the period in which it is in contact with the track position where the servo signal Ps=Qs is recorded, the adjacent track m++ m2 is also reproduced, as shown in FIG. 5(b).
Regenerated pilot signals Va, V+, similar to those shown in
Vs can be extracted.

Then, the servo works to equalize the levels of v1 and V2 of the reproduced pilot signal, and the subsequent recording head 2b
' runs in the center of the track mlI. From this,
A portion ε where the trailing recording head 2b' comes into contact with an adjacent track
, β are affected only by the track width T of the trailing recording head;
It is not affected by the offset angle Φ between b' or the step h.

From these facts, the track width Tua of the trailing recording head
is set almost equal to the track pitch Tp, so the portions ε and β that are in contact with adjacent tracks can be made as close to 0 as possible, and it is possible to avoid a situation where only one of ε and β becomes large. be. On the other hand, the preceding reproducing head 2b runs on the track 10, and is in contact with the adjacent tracks 1+ and 1g by a portion of the track width α and γ, respectively. The portions α and γ that are in contact with the adjacent tracks are affected by the offset angle Φ with respect to the trailing recording head 2b' and the step h, and therefore generally do not take equal values. However, since the preceding reproducing head 2b only performs reproduction, as long as the track width TIIs covers the track (α, γ≧0), the preceding reproducing head 2b
The error rate of data reproduced in b does not deteriorate. Since the track width T, s of the preceding reproduction head 2b is set to approximately 1.5 times the track pitch Tp, the allowable range in which the track width Tus of the preceding reproduction head 2b can be displaced with respect to the track is the same as that of the conventional example. Recording head 2b
The track width Tin of ' is wider than the range in which it can be displaced with respect to the track. This shows that there is no problem in terms of the system even if the required assembly accuracy of the rotary cylinder is lowered. Further, the signal written by the trailing recording head 2b'' is the data reproduced by the trailing recording head 2b' (for example, the timing f2 seen in the servo signal as shown in the conventional example in FIG. 6). Therefore, the accuracy of the data writing position and writing end position depends on the leading reproduction head 2b and trailing recording head 2b arranged on the rotary cylinder 1. ' installation angle Φ,
The relationship between the height difference h and the mounting accuracy disappears.

As described above, according to this embodiment, the trailing recording head 2b' running on the track ms is made to function as a reproducing head only during the period when it is in contact with the track position where the servo signal Pe+Q@ is recorded, and the trailing recording head 2b' runs on the track ms. ' to servo signal Qs
, QI, Qe and Pa. By reading P+ and Ps, the feed of the magnetic tape 3 and the rotational phase of the rotary cylinder 1 are controlled. For this reason, the trailing recording head 2
b' is independent of the mounting angle Φ of the preceding reproducing head 2b and trailing recording head 2b' arranged on the rotating cylinder 1, and the mounting accuracy such as the step h, and the center of the track ms can be run. It is possible to prevent deterioration of the error rate in the vicinity of the editing point due to damage to the written track or adjacent track due to editing.

Further, the timing of the signal written by the trailing recording head 2b' is adjusted based on the data reproduced by the trailing recording head 2b'. Therefore, the accuracy of the data writing position and writing end position is
There is no relationship between the mounting angle Φ of the preceding reproducing head 2b and the following recording head 2b' arranged on the rotary cylinder 1, and the mounting precision of the step h. As a result, the assembly accuracy of the rotary cylinder deteriorates, and the data writing position and writing end position shift, resulting in additional information areas (subcode areas) Ds++ Ds2, on the entry and exit sides shown in the conventional example in FIG. Information data area D1 for music, etc. It is possible to avoid interference between each data such as the servo signal p and q areas, and it is possible to avoid deterioration of the error rate due to editing operations called PCM dubbing and subcode dubbing.

In addition, by setting the track width TI1s of the preceding reproducing head to approximately 1.5 times the track pitch Tp and setting the track width Twa of the trailing recording head approximately equal to the track pitch Tp, the track width Tus of the preceding reproducing head is set to approximately 1.5 times the track pitch Tp. The permissible range in which Tva can be displaced with respect to the track is wider than the range in which the track width Tva of the trailing recording head in the conventional example can be displaced with respect to the track. This shows that the required assembly precision of the rotary cylinder can be made less demanding than in the conventional example.

Effects of the Invention As described above, the present invention arranges and records information signals such as music and servo signals for tracking control of the rotary head in a time-divided manner on each track on a tape recorded and reproduced by a rotary head. A rotary head type magnetic recording/reproducing device using a rotating head type magnetic recording/reproducing device, which includes a preceding playback head that plays back data in advance, and a post-recording system that performs fade processing on the data reproduced by the preceding playback head and then re-records it on the same track. It consists of a rotating cylinder in which a head, a preceding reproduction head and a trailing recording head are arranged together, and the trailing recording head is time-divided and functions as a reproduction head during a period in which it is in contact with a track position where a servo signal is recorded. By reading the servo signal with the servo signal and controlling the tracking of the rotating cylinder using the reproduced servo signal, the deterioration of the error rate due to track damage that occurs near the editing point can be minimized regardless of the assembly accuracy of the rotating cylinder. This makes it possible to realize a highly reliable and high-performance rotary head type magnetic recording/reproducing device, which has great practical effects.

[Brief explanation of drawings]

The first construction drawing is a plan view showing the magnetic tape pattern and the arrangement of the leading disk and the magnetic tape of a rotary head type magnetic recording/reproducing device according to an embodiment of the present invention, and FIG. 3 is a rotary head arranged in a rotary cylinder. A front view showing the mutual height relationship, Figure 4 shows the magnetic tape pattern and the preceding playback head, in which servo signals are arranged and recorded on the track by time division method, and the trailing voice signal is arranged on the track by time division method. FIG. 4 is a detailed explanatory diagram of a track pattern to explain what is recorded. 1...Rotating cylinder, 2a+2b...Advance playback head, 2a'', 2b'...Following recording head, 3
···Magnetic tape.

Claims (3)

[Claims] (1) A rotary head type magnetic recording/reproducing device in which information signals and servo signals for tracking control of the rotary head are time-divided and recorded on each track on a tape recorded and reproduced by a rotary head. a preceding playback head that plays back data from the track in advance in terms of timing, and a follow-up recording head that performs fade processing on the data reproduced by the preceding playback head and then rerecords it on the same track again; The trailing recording head is used in a temporally divided manner, and during the period in which it is in contact with the track position where the servo signal is recorded, it functions as a reproducing head to read the servo signal, and the reproduced servo signal is used to read the servo signal. A rotary head type magnetic recording and reproducing device characterized by performing tracking control. (2) The rotary head type magnetic recording and reproducing apparatus according to claim 1, wherein the write timing by the trailing recording head is determined by a servo signal reproduced by the trailing recording head. (3) The rotary head type magnetic recording and reproducing apparatus according to claim 1 or 2, wherein the preceding reproducing head has a wider track width than the trailing recording head.