JPH01312761A - Tracking control method for rotary head type tape recorder - Google Patents

Abstract

PURPOSE:To keep the continuity of track at joints by tracing the final track based on a tracking error signal obtained by tracing one preceding track of the final track of the recorded part and transiting the mode to the consecutive recording mode from the blank part. CONSTITUTION:In case of tracing the final track T0 in a rotary head type digital audio tape recorder, since a gate signal terminal goes to a low level, the gate circuit is closed and no tracking error signal of the final track T0 is fed to a summing amplifier 57. Thus, the tracking error signal of a one preceding track T-1 of the final track T0 is supplied to the summing amplifier 57 while being held. Thus, while the tracking error signal of the track T-1 is being held, the rotary head 11 traces the final track T0 and the recording mode is selected to form a new recording track thereby applying consecutive recording to the blank part B.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a tracking control method for a rotary head tape recorder, and more particularly to a tracking control method during splicing and after-recording.

(B) Conventional technology Conventionally, the tracking control of rotary head digital audio tape recorders (hereinafter referred to as R-DAT) has adopted an area-divided ATF. The entire bottom of the tracking area is formed at the trace start end and trace end of each track of the tape that is helically scanned, and each tracking area has a pilot area in which the tth pilot signal for tracking control is recorded and this pilot signal. A 4-track complete type with a sync area in which a ninth sync signal that sets the timing of chimpling is recorded, and the frequency of this sync signal is distinguished for each track, and the area length is also distinguished for every 2 tracks. In other words, such a 4-track complete M-type tape pattern is as shown in Fig. 6, and fl is 130.67 KHz O/<
4 a) Signal e, f2 is a 522.67 KHz sync signal, f5 is a 734 KHz sync signal, f4 is 1
, 568 MHz, and the area length of these sync signals is changed to 0.5, 1 block every two tracks.

Therefore, when an n-th tape with such a tape pattern recorded is played back to two rotary recording/playback heads whose head width is larger than the track width, a sync signal is generated from the playback output of the rotary heads. Based on the timing at which is detected, the n pilot signal σ stalk component (hereinafter referred to as the pilot night read signal) reproduced from the pilot area of each of the left and right adjacent tracks is sampled, and the level of the both side read signals is determined. The comparison is detected and the level difference is supplied to the capstan motor control section as a tracking F-signal to perform tracking control during reproduction (tape running control so that this signal becomes zero). Specifically, the tracking control circuit section is configured as shown in the seventh factor. For example, when the starting end of a track is traced by one of the main recording/reproducing rotary heads, the reproducing head of this rotary head The output is a playback amplifier (1
) K, amplified f'L7?1. B P F (supplied to 2J. This B
P F (The pilot signal component obtained from 2J is the 8th
It consists of the pilot signal PM from the home truck traced to the structure shown in Figure Cb), the pilot side read signal PR from the left and right trucks, that is, the right truck, and the pilot side read signal pz from the left truck. There is. BPF (2) for this work 9. The extracted NFC pilot signal component is passed through an envelope detector (3
), and after that, it is supplied to the 1f null hold circuit (4)K. On the other hand, the playback notes from the rotary head for recording and playback are processed into an equalizer (5) to equalize the waveform, and then a zero cross comparator (6).
is converted into a digital signal by And is this borrowed name for logic circuit (7)? Digital processing Figure 8 CC)
As shown in Figure 8 (d), at the same time as the sink No. 1g is detected
) A refined sampling pulse SPl for sampling the pilot signal is supplied to the first sample hole loop (4). Therefore, the pilot side read signal PR is held by this sampling pulse SP1 in the 1f-th hold circuit (4),
The difference between the pilot side read signals PR and Pr (D) is supplied from the nasal microscope (&) to the second temple hold circuit (9). At this time, the logic circuit (7) shown in FIG. 8 (Q)
The template pulse SP2 shown in FIG. 1 is supplied to the second f sample hold circuit (9). Therefore, by this sampling pulse SPz, the second sample hold circuit (9)
Then, the difference between the pilot side read signals PR and Pr is held and output, and this output signal is supplied to the capstan motor control section as a tracking signal.
Tracking control will be performed.

Well, like the 9th cause, record next track (To) (T-s)
(-T-2) Following on from..., so-called after-recording involves re-ri3f&ing only specific areas such as sub-code areas, such as the sub-code area, to record so that the seams are not noticeable during playback. At times, etc., the tracking position of the rotary head 1υ for recording/reproduction (KIII) must be adjusted so that the end of the gear lug in the width direction of (1) coincides with the end of the recording track in the tape transport direction. 45° i offset tracking control is described in Japanese Patent Application Laid-Open No. 61-73224.
No. (GIIB15/467).

Furthermore, as shown on the second page, when performing splicing recording, when the recording pause is turned on, the tape will move to the seventh place [11Pi
After rewinding the tape by a predetermined amount, the tape enters a pause state in the middle of the ri3n portion (position P2), and when the pause is released in this state, the tape enters the playback mode for a period corresponding to the tape rewind amount and the playback tracking control is activated. When the camera reaches position P5, the recording mode is entered and continuous recording is performed.

Regarding the above-mentioned spliced recording, Japanese Patent Application Laid-Open No. 1986-1977
NFT described in Publication No. 159 CG11B15/467)
There is something.

(/9 Problems to be Solved by the Invention) However, when obtaining a tracking error signal in the playback mode, as shown in FIG. When the track (Tt) (Tz) is set to be formed sequentially, no track is formed after the last track (To), and the pylon signal of the right track is
Unfortunately, since the tracking error signal is supplied to the circuit that controls the capstan motor, the capstan driver may be disturbed immediately after the start of splicing, resulting in poor splice recording. was there.

(2) Elaborate means for solving the problem The present invention provides a method for obtaining a tracking error signal in the ninth playback mode, which is performed during splicing recording such as recording on a black portion (unrecorded portion) following a recorded portion. , retains a tracking error signal obtained by tracing one track before the final track of the recorded portion, traces the final track based on the error signal, and after t, enters a splicing mode from the black portion. A tracking control method for a constant rotation head type tape recorder (b) is proposed.

(E) Effect: According to the above method, the splice recording to the black part is correct.
The continuity of the track is lost at the joint.

(F) Embodiment An embodiment in which the present invention is applied to a rotary head type digital audio tape recorder will be described with reference to the drawings.

FIG. 1 shows a specific tracking control circuit, in which the same parts as in FIG. 7 of the conventional example are given the same reference numerals, and their explanation will be omitted. In Figure 1, +2]+ is the gate signal terminal,
Similar to the conventional example, splice recording operation 1 as shown in Fig. 2:
Part (TO) of the tape as shown in Figure 3 (T-1)
When recording the black part (8]K continuously by connecting to tT-z)..., tracking control is performed during playback mode and n tracking error old number is obtained.At that time, the gate signal is the last track (TO). In order to cancel the tracking error signal and hold the tracking error signal of the track (Ts) immediately before the last track, the last track (
Memorize the f position of [TO] and trace the M final track (To). Low level only during the period, the final track! Seven previous tracks (T-1) (T-2) (T-3)...The entire tracing period is at the high level. The reason is that the sampling pulse SP2 as shown in FIG. 1 is not sent to the second sample hold I!!l path (9) during the period when the head (III) or the final track (To) is traced by the gate signal. , head συ is the final track (Tx) (Tz) (Ts)...
・Templing pulse 5Pz during tracing period
t- This is a gate circuit that operates in the same manner as the signal sent to the second sample and hold circuit (9).

Further, FIG. 5 shows the speed control system of the capstan motor to which tracking error No. 18 is added, in which 6D is the capstan motor that drives the capstan that feeds the tape, and t52 is the motor 511. 6J is an FG sensor amplifier that amplifies the signal from the HFG (52), and 6<1 is an IIU.
Speed servo circuit 651 that controls the speed of the capstan motor 511 from the FG double signal of the
Fi, the cancel according to the FG times the signal.

The phase servo circuit that controls the phase of the nutan motor ci11, □□□, connects the summing amplifier 5η and the phase servo circuit 55), which will be described later, during recording, and also connects it to the phase servo circuit 55), which will be described later. The tracking error signal is supplied to a summing amplifier 157) to be described later; the switch circuit 67) is connected to the switch circuit 67) which, during recording, combines the phase error signal from the phase servo circuit and the speed error signal from the speed servo circuit 5. is a sword 0 that adds and amplifies the tracking error signal and the speed error signal during playback.
The operational amplifier 6D is a key stan motor drive circuit that controls the capstan motor according to the control signal from the amplifier 6D.

In the rotary head type digital audio tape recorder with the above configuration, as shown in Figure 3: Sea urchin 6 recording section (To)
(T-1) (T-2)...Following the black part (
1) The tracking error signal obtained behind the tracking error in playback mode when performing Ic splicing recording is as follows:
In the circuit configuration diagram of FIG. 1, the gate signal terminal (when 2IJ is at high level, it is supplied to the 710 arithmetic amplifier 67 of the capstan motor speed control circuit shown in FIG. 2), When tracing the final track (TO) (see Figure 3), the gate note terminal c! Since D becomes low level, the gate circuit is closed, and the tracking error signal of the last track (To) cannot be supplied to the summing amplifier 57) (see the third factor). The amplifier 15η has the final track (TO) tiEa.
The tracking error signal of the trunk (T-1) is held and provided. With this method, the tracking error signal of the track (T-1) is held and the rotating head συ traces the final track (TO), and then the recording mode is changed to 9J and a new recording track (Tl) (T2) is recorded. ... is formed, and the black part (B)
The recording can be carried out as shown in FIG.

[G] Effects of the invention As described above, according to the tracking control method of the present invention,
This is very advantageous because it is possible to reliably perform spliced recording on the black portion without damaging the recorded track, and the continuity of the tracks is maintained so that the seams are not noticeable during playback.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing the tracking control circuit of the present invention, Fig. 2 is a diagram showing all the timing of splicing operation, and Figs. 3 and 4 are track states for explaining the splicing of the present invention. 5 is a block diagram showing the speed control circuit of the capstan motor of the present invention, FIG. 6 is a diagram showing a tape pattern showing a rotary head type tape recorder, and FIG. 7 is a diagram showing conventional tracking control. Block (2) showing the circuit, Figure 8 is its false signal waveform diagram, Figure 9 is the 45''
FIG. 3 is a diagram showing offset tracking. (TO)...Last track,...gate circuit, (
T-x)...Previous track〇

Claims (1)

[Claims] (1) A tracking area is formed at the trace start and end of each track of the tape that is helically scanned by a recording/playback rotary head installed in a rotary head cylinder, and a pilot is formed in each tracking area. A pilot area where a signal is recorded and a sync area where a sync signal is recorded are respectively provided, and crosstalk components of pilot signals from adjacent tracks on the left and right are sampled based on the sync signal from the track to be traced during playback. This rotary head tape recorder uses the difference between these two crosstalk components as a tracking error signal and performs tracking control so that this error signal becomes zero. In the playback mode to obtain the tracking error signal used during recording, the tracking error signal obtained by tracing the track immediately before the final track of the recorded portion is held, and the final track is determined based on that signal. A tracking control method for a rotary head tape recorder, characterized in that after tracing a black part, a transition is made to a continuous recording mode.