JPS6079550A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To make a track pattern continuous and uniform even at an insert- editing time by providing at least one magnetic head in addition to a regular recording and reproducing head, and executing a tracking on a recording pattern of a tape by the recording and reproducing head basing on a new magnetic head reproducing signal at the insert-editing time. CONSTITUTION:Two regular recording and reproducing magnetic heads 21, 22 are installed at a position of 180 deg. on a magnetic head on which a rotary drum is installed, and also, on the same plane as this magnetic head 21 and 22, another pair of magnetic heads 23, 24 are installed at a position rotated by 90 deg., respectively, against the magnetic head 21 and 22. At an insert-editing time, an output of the first circulating frequency generator 19 is superposed on a video signal led from an input terminal 3, and this signal is impressed to the magetic head 21 and 22 through a recording amplifier 4 and a switch 5 and recorded on a magnetic tape. On the other hands, the signal on the magnetic tape is reproduced by the magnetic head 23 and 24, and this signal is supplied to a reproducing amplifier 8 through a rotary transformer 20 and a switch 25.

Description

[Detailed Description of the Invention] The invention relates to a rotating head type magnetic recording and reproducing device (hereinafter abbreviated as a rotating head type VTR) for recording and reproducing video signals.
This invention relates to a magnetic recording and reproducing device that is configured to record and reproduce a pilot signal by superimposing it on an information signal, and to detect a tracking error based on the reproduced pilot signal. be.

Conventionally, the method of obtaining good tracking is to use two 4's. One of them is to provide a control track and generate a control signal (CTL) according to the vertical synchronization signal.
signal) is recorded and reproduced using a fixed head, and this reproduced C
This method uses TL signals. The other method is to record and reproduce a pilot signal superimposed on a video signal, and to utilize the reproduced pilot signal.

In devices that use the CTL signal system, when recording a new signal by inserting it into one section of an already recorded tape, so-called insert editing recording, the already recorded CT
By controlling the tape feed using the L signal,
Means for ensuring that the track pattern is continuous and uniform are already known.

However, in the pilot signal method, the pilot signal is recorded superimposed on the video signal, so when the purpose is insert editing, for example, the KC
There was the trouble of having to record the TI signal in advance on the tape feed control.

First, the main parts of the tracking of the pilot signal method, which is the background of the present invention, will be explained below.

FIG. 1 is a pull diagram showing one embodiment of the pilot signal system. In the figure, a head switching pulse is input to an input terminal (1). In response to this head switching pulse, the cyclic frequency generator (2) generates signals of four frequencies for each field by cycling the four fields as a cycle.

These four frequencies are, for example, NTSC (Natlo
nal Televimlon 8yst@m Com
When recording a video signal using the n1ttee) method,
fosa -m 378fh (fk: horizontal synchronization signal frequency), flss fosc/58tf, -f
Choose as follows: osc/50 e et al - fose/36 e and f4 = fosc/4 G. The output of this frequency generator (2) is input to the input terminal (3) and is superimposed on the modulated video signal, and this superimposed signal is sent to the recording amplifier (4), the switch (5) and the rotary transformer (6). is applied to the magnetic head (7) to record on the magnetic tape.

FIG. 2 shows a magnetic tape TP recorded as described above.
The above pattern is shown. The video signal tracks are lined up in the longitudinal direction of the tape TPO in a field sequence, and a pilot signal is recorded on these tracks in an overlapping manner.

Fl, F2. F3 and F4 are respectively the above f,,
This indicates that pilot signals of frequencies f, , et al. and f4 are recorded.

Believe! During reproduction, as shown in Figure 2, the magnetic head Mu
When tracking the track Fl, the signal reproduced by the magnetic head MH includes the frequency of f, as well as the pilots of both adjacent tracks due to the side lead effect, losstalk effect, etc. Signals (in the case of FIG. 2, pilot signals of frequencies f4 and f) are included at the same time. The magnitude of the pilot signal components of both adjacent tracks included in the signal reproduced by the magnetic head MH changes depending on the amount of positional deviation of the magnetic head MH from the track center. For example, magnetic head M
If H is displaced in the direction of F2 (to the right), the magnitude of the pilot signal component at frequency f increases. Therefore, by detecting the magnitude of the pilot signal components of both adjacent tracks, the amount of positional deviation of the magnetic head Ml from the track center can be detected.

In FIG. 1, when reproducing a signal, a signal is reproduced from the magnetic tape TP by a magnetic head (7), passes through a rotary transformer (6), a switch (5), and a reproducing amplifier (8).
) is amplified by

The video signal component of the output of the regenerative amplifier (8) is removed by a low pass filter (hereinafter abbreviated as LPF) (9), and a pilot signal component is extracted. This L
The pilot signal component extracted by P F (9)) is mixed with the output of the cyclic frequency generator (2) that sequentially generates frequencies flthf, *t fm, f4 for each field in response to the head switching pulse. input to the device CIG. The output of this mixed speech beginning is passed through a first band pass filter (hereinafter abbreviated as BPF) and a second BPF.
By passing through Q3, a difference frequency signal component between the signal frequency of the cyclic frequency generator (2) output and the frequency of the pilot signal component of the LPF (θ) output is obtained.

By the way, in the case of an NTSC video signal, f.

ac: s, 95 MHz, so fIt f
tt'm and f, fi: 102 KHz,
f, '119KHz, fl:165KHz, f
4: 149 KHz. For this, f, -f1
=f, -f4:16.5 KHz, f4-fl:
f, -f.

:46.5KHz. Therefore, the passband of the first BPFI is set near 16.5 KHz, and the passband of the second BPF (
Assume that the 12 passbands are chosen near 46.5 KHz.

When the magnetic head MH is tracking the track Fl as shown in Fig. 2, a signal with an amplitude proportional to the thickness of the pilot signal (frequency ft) component of the track F2 is obtained by the 10th BPF 111). A signal having an amplitude proportional to the magnitude of the pilot signal (frequency fi) component of the F4 track is obtained from the 20th BPF (131).This first BPF QI) and the second BPF (
2) to the first detector (to) and the second detector I
By performing envelope detection on each of the first and second detectors (2) and passing the respective outputs of α4 to the subtracter 09, it is possible to detect the magnetic head to the left or right from the track center of the magnetic head MH in FIG. A voltage level corresponding to the amount of positional deviation is obtained as the output of the subtracter.

The recording pattern in Figure 2 and flt f, , et al and f4
As is clear from the frequency of the magnetic head MH in FIG. 2, when the magnetic head MH is tracking Fl or F3 and when it is tracking F2 or F4, The polarity of the output of the subtractor (2) for the positional deviation of is reversed. Therefore, the output of the subtracter (to) and the signal obtained by inverting the output of the subtracter (to) by the inverting amplifier (to) are connected to the switch α? )K, and when selected in synchronization with the head switching pulse, an output voltage proportional to the amount of positional deviation of the magnetic head MH from the track center can be obtained from the output terminal αa.

Good tracking can be obtained by feeding back the signal obtained from this output terminal to a capstan motor (not shown).

The present invention provides a magnetic recording and reproducing apparatus that employs a pilot signal system, by adding at least one magnetic head in addition to the two normal recording and reproducing magnetic heads installed at 180° positions. The track pattern is made continuous and uniform even during insert editing.

An embodiment of the present invention will be described below with reference to FIGS. 3 and 4.

Figure 3 is a layout diagram of the magnetic heads installed on the rotating drum.
2) is installed at position xso', and another pair of magnetic heads (C) and (2) are installed on the same plane as the magnetic head company)
and ■, respectively, are installed at positions rotated by 90 degrees. In this embodiment, each magnetic head CI!
1) It is assumed that the head widths of , @, @ and (to) match the track width. In this way,
It is clear that during insert editing, the track center during normal signal reproduction and the track center during insert editing recording coincide.0 Figure 4 shows a rotary head type VTR to which the magnetic recording/reproducing apparatus according to the present invention is applied. The circuit configuration shown in FIG. In FIG. 4, (1) is the first circulating frequency generator, which has the same function as the one in FIG. 2
), (2) and (goods). (2) is the magnetic head I: j3 when editing the ral and insert with the switch.
Alternatively, the reproduction output of the magnetic head can be transferred to a reproduction amplifier (8
). (4) is a delay circuit that shifts the head switching pulse by 90 degrees;
, , and a second cyclic frequency generator that generates the frequency of f4; ⑼ is a switch that supplies the output of the second cyclic frequency generator (a) to the mixer αω during insert editing;
is a switch C11 which selects the output of the first detector (2) or the second detector (141) based on the output of the delay circuit and supplies it to the amplifier □□□.
1) is a switch that supplies the output of the amplifier (to) to the output terminal (2) during insert editing.

Next, the operation of the above configuration will be explained with reference to FIGS. 3 and 4.

During insert editing, the output of the first cyclic frequency generator α9 is superimposed on the video signal led through the input terminal (3), and this signal is sent to the recording amplifier (4), switch (5) and rotary transformer (4). is applied to the magnetic head (2) to record on the magnetic head P.

On the other hand, the signal on the magnetic tape TP is reproduced by the magnetic head (2) and the magnetic head (2), and this signal is supplied to the reproducing amplifier (8) through the rotary receiver (4) and the switch (A).

To start signal recording in insert editing, first perform the tape running control in the normal playback described above, enter synchronization control, and then switch to insert editing mode at the desired recording start point.

At this time, the positional relationship between the recording pattern in the width direction of the magnetic tape and each of the magnetic heads is as shown in FIG. 5, for example. The magnetic head (21J is located at the tip of the track Fl, and the magnetic head (support) F4) is located at the rear end of the rack. Therefore, since the magnetic head @ is arranged as shown in FIG. 3, it is located at the center of the track and on the boundary line between the F4) rack and the F1 track. The delay circuit (A) shifts the phase of the head switching pulse by 90 degrees.
The head is switched so that the switching position of the magnetic head (23) or the magnetic head (product) is the same as the head switching position of the magnetic head (21+I or the magnetic head (support) in the tape width direction. Further, this delay circuit (A) outputs fl, , f from the second cyclic frequency generator in a predetermined order at its output.
, , Chi' or f4 frequencies are sequentially generated. At the magnetic head position shown in FIG. 5, f4
Suppose that the frequency of is generated by the second cyclic frequency generator. Note that at this time, the first circulating frequency generator section is f
The frequency of fl is switched from the frequency of 4 to the frequency of fl.

At the position of the magnetic head (2) shown in Fig. 5, the signal reproduced by the magnetic head (2) includes a pilot signal component with a frequency of 110 corresponding to the width of the head and a signal reproduced by the magnetic head (2). A frequency component of f4 of a magnitude corresponding to the intensity is included. The two pilot components are extracted at L P F (9) and added to the mixer. On the other hand, since the second circulating frequency generator (2) generates the frequency f4, the difference frequency component from fl corresponds to the strength of the head width. A signal having an amplitude is obtained from BPFQ2 of bird 2. Also, when the magnetic head (Incorporated) is on the boundary line between the Fl) rack and the F2 track in Figure 5, that is, whether the Magnetic Head (Incorporated) is above the tape width of the Fl) rack,
When the magnetic head (support) is located below the tape width of the F2 rack, the second cyclic frequency generator slope generates a signal with a frequency of f8, so the difference between fl and f is A signal whose difference frequency component has an amplitude proportional to the width of the head on the F2 track is obtained from the 10th BPFQυ.

When the frequency generated by the second circulation frequency generator (5) is controlled using a signal obtained by shifting the head switching pulse obtained by the delay circuit (4) by 90 degrees, the magnetic head gain will change to the F4 track. When the magnetic head falls on the boundary line of the F1) rack, or on the boundary line between the F2 track and the F3) rack, a signal with an amplitude proportional to the amount of positional deviation from the boundary line of the magnetic head is obtained from the 20th BPFa2. ) falls on the boundary line between Fl) rack and F2) rack, or on the boundary line between F3) rack and F4) rack, the first BPF (6) and magnetic head
A signal with an amplitude proportional to the amount of positional deviation from the boundary line is obtained.

Therefore, at the output of the delay circuit □□□, the first detector (
If you select the output of the magnetic head (2) or the output of the second detector αΦ with the switch ■, the output of the magnetic head (2)
A voltage proportional to the amount of positional deviation from the boundary line can be obtained. In other words, the voltage value proportional to the amount of positional deviation of the magnetic head or @ from the track is isometrically shown. This signal is fed to the amplifier head, given the appropriate Coff 7t and amplifier gain, and fed to the output terminal 0s through the switch (3υ).

FIG. 6 shows the output voltage of the output terminal αQ with respect to the amount of positional deviation of the magnetic head in the longitudinal direction of the tape when the frequency of the output of the second circulating frequency generator is fixed to fi.

In FIG. 6, when this output voltage is integrated in the longitudinal direction of the tape, it becomes . The output voltage at the desired tracking position is VO, and obviously the lock range when a control loop is constructed is severely limited. For this reason, if synchronization pull-in is performed in the normal playback mode before insert editing starts, even if the mode shifts to the insert editing mode, the control ability for small signal components is sufficient and control can be performed without any problem. Therefore, by doing the above, a uniform and continuous recording pattern can be obtained even during insert editing.

In addition, in the above embodiment, the magnetic heads Qυ and @
Although the head widths and track widths are the same, if the head widths and track widths are not the same, the following procedure may be used. - For example, magnetic head C!
Consider the case where υ, @, @ and (to) are 120% head (a magnetic head whose head width is 120% of the track width). When the embodiment shown in FIG. 4 is applied as is to such a head, FIG. 7 shows an example of the recording pattern on the magnetic tape and the position of the magnetic head near the time when insert editing is started.

During normal playback, tape running is controlled so that the amount of crosstalk (including side leads) of both adjacent pilot signals is equal as described above, so as shown in Fig. 7 (6).
As shown, the magnetic head (C) runs along the center of the F1 rack, and the magnetic head (C) runs so that its head center passes over the boundary line between the F4) rack and the F1 track. Part 7) shows the recording pattern and the position of the magnetic head immediately after insert editing, and the shaded area represents the newly recorded pattern.

According to the embodiment shown in FIG. 4, the magnetic head @ traces on the boundary line of each track, so if the response band of tape running control is ideally infinite, then As shown in Figure 7 (Q), the newly recorded pattern will have a track width of 110% (however, the final track width will be 120% width. This means that a head wider than the track pitch is used. An example of solving this problem is shown in Fig. 8. Input terminal (to)
A signal indicating the insert editing mode (FIG. 9, 0) is input to . This signal controls switch (5), switch (to), switch (2), and switch cent to perform insert editing. On the other hand, a signal indicating the insert editing mode inputted to the input terminal (2) and a delay circuit (1
) from the output signal (Figure 9 (b)) to the logic circuit (to)
After starting insert editing, the magnetic head (2) or (to) traces the boundary line between the newly recorded recording pattern and the old recording pattern that has already been recorded.
A signal (Fig. 9) indicating the period of switching is created. This time chart is shown in Fig. 9. At the output of this logic circuit (to), the DC offset level of the amplifier (to) is set to 10 of the head width. % positional deviation, the magnetic head (to) and (to) are shifted as shown in Figure 10.
By always tracking around the boundary line of the old recording pattern, the recording pattern can be kept uniform.

However, in the embodiment shown in FIG.
As shown in the figure, the recording pattern is shifted in the longitudinal direction of the tape by an amount corresponding to 10% of the head width immediately after the insert editing starts and when it ends. In the response band of a normal tape running control loop, there is almost no problem in response for a shift equivalent to about 10% of the head width, but if the head width is set larger than the track width, the control loop The problem is the deterioration of image quality due to transient response.

The 11th embodiment shows an example in which the recording pattern after insert editing is uniform and continuous even when the head width of the magnetic head (company) and (support) is much hotter than the track width.
As shown in the figure. In FIG. 11, tape running is initially controlled in the normal playback mode. Operate switch (5), switch (to), and switch (2) to
A tracking error signal is created using the reproduced pilot signal of (2) and outputted from the output terminal (2). 'After the tape has sufficiently run in synchronization in the normal playback mode, the switch (H )
, switch (to), and switch 01) to enter the insert editing mode. At the same time, the output of the delay circuit (a) (Fig. 12 @) and the output of the logic circuit (to) (
A signal as shown in FIG. 12 0 is created using the logic circuit (to) from FIG. 12 @). This signal is input to the amplifier (to), and the DC offset level of the amplifier (to) is shifted so that the tracking position on the boundary line of each track of the magnetic head (2) and (material) is shifted by the amount of the drug. In this way, as can be seen from Fig. 13, the magnetic head and ■ will track along one edge of the recording pattern. After that, a signal indicating the insert editing mode input to the input terminal (2) will be used. , operate the switch (5) to put the magnetic head and @ into the signal recording state, and shift the DC offset level of the amplifier (to) at the output of the logic circuit, which corresponds to 10% of the head width. When a DC offset level is given according to the positional deviation to be made, as shown in Figure 13, the magnetic head (2) and t2IJ maintain the same tracking position as the tracking position on the boundary line of the old track pattern immediately before insert editing started. For,
Even after recording a new recording pattern, the magnetic head (2) and (support) continue to track along one edge of the old recording pattern, so even if insert editing is performed,
The continuity of the recording pattern can be maintained (however, the final track width is 12ON as described above).

Note that the magnetic head (2) in the above embodiment can also be used as a magnetic head provided for special reproduction such as a normally used stereo or still.

In this case, even if the magnetic head is provided with an appropriate step for the purpose of special reproduction, good tracking can be obtained by appropriately setting the DC offset of the amplifier. be able to.

In addition, in the above embodiment, the mounting position of the magnetic head (21,
For example, if the DC offset value of amplifier (2) is appropriately selected, the mounting position can be set freely within the range where the control loop is stable.

In FIG. 3, the magnetic head (2) scans the magnetic tape TP in advance of the magnetic head (2), but the magnetic head (2) scans the magnetic tape TP in advance of the magnetic head (2).
There is no problem even if 2) comes later.

In addition, in the explanation of the embodiment shown in FIG. 4 above, two magnetic heads, ie, magnetic head @ and (corporate), were described, but even in the case of only one magnetic head, for example, a magnetic head, As shown in Fig. 14, the sample and hold circuit (G) is intersected, and within the range where the inside of the magnetic head is in contact with the magnetic tape in the sample pulse generation circuit tube, for example, the delay circuit ■output and input terminals ( By creating a sampling pulse with the input signal of 1), and using the output pulse of this sample pulse creation circuit, the output of the second detector αa is sampled and held in the sample hold circuit (to). Yes, a similar effect can be obtained. Figure 15 (6) to 0 are the head switching pulses input to the input terminal (1) and the delay circuit (support), respectively.
A time chart of the output of the sample pulse generation circuit (to) and the output of the sample pulse generation circuit (to) is shown.

In addition, in the above embodiment, the magnetic head (goods) and (
However, as shown in Fig. 16, the cyclic frequency generator αω generates a pilot signal to be superimposed on the video signal. The output is added to the mixing head, and the head switching pulse input to the input terminal (1) is sent to the sample pulse generation circuit (to) during the period when the magnetic head (23 or (Foundation)) is in contact with the magnetic tape. Constant time T.(1it0 is 0(6(
To generate a pulse delayed by 90 degrees or 90 degrees θ (time corresponding to 180 degrees θ), sample and hold circuits 1 and 2 are provided in the first detector t13) and the second detector α4171, respectively. A similar effect can be obtained by sample-holding the output of the sample pulse generating circuit. FIG. 17 (6) 1g3) shows a time chart of the outputs of the head switching pulse and dull pulse generating circuits (to), respectively.

In the case of a rotating head type VTR, an azimuth recording method is normally used, but the pilot signal frequency is selected in a range that is not affected by azimuth loss, so the azimuth angle of the magnetic head (131 and It doesn't matter how you choose, within the range of choices you normally make.

In addition, in the description of the above embodiment, the rotary head type VT
Although the description has been made regarding R, it goes without saying that the present invention can be applied to a rotary head type magnetic recording/reproducing device such as a rotary head type magnetic data recorder.

As described above, the present invention provides at least one magnetic head in addition to the normal recording/reproducing head, and upon insert editing, based on this new magnetic head reproduction signal,
By tracking the recording pattern on the tape with the recording/reproducing head, it is possible to provide a magnetic recording/reproducing device in which the track pattern is continuous and uniform even during the above-mentioned insert editing.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of a tracking error detection circuit of a conventional magnetic recording/reproducing device using a pilot signal method, and FIG. 2 is a diagram showing a recording pattern on a magnetic tape used in the device of FIG. FIG. 3 is a magnetic head layout diagram applied to the magnetic recording/reproducing apparatus according to the present invention, FIG. 4 is a block diagram showing an example of the magnetic recording/reproducing apparatus according to the present invention, and FIG. 5 is an implementation diagram of the magnetic recording/reproducing apparatus according to the present invention. FIG. 6 is a diagram showing the state of head tracking on a recording pattern of a magnetic tape based on an example, and FIG. 6 is a position in the longitudinal direction of the magnetic tape when the signal frequency of the cyclic frequency generator is fixed at fl in the embodiment of FIG. A diagram showing the output voltage with respect to the deviation, Fig. 7 is the 4th
FIG. 8 is a block diagram showing another embodiment of the present invention. FIGS. Time chart in the example of FIG. 10cA)
~0 is a diagram showing the recording pattern and head tracking when insert editing is performed based on the embodiment of FIG. 8, and FIG. Block diagram showing still another embodiment, FIG. 12 11
1A) to 0 are time charts in the embodiment of FIG. 11, FIG. 13 is a diagram showing the recording pattern and head tracking when insert editing is performed in the embodiment of FIG. 11, and FIG. FIG. 15 is a block diagram showing yet another embodiment (8 to 0 are time charts in the embodiment of FIG. 14, and FIG. A block diagram illustrating an embodiment of the invention when used (see FIG. 17)
, @ are time charts in the embodiment of FIG. 16. (1)...Head switching pulse input m, (3
)... Information signal input terminal, (4) -... Recording amplifier,
(5), α, @ (support), @, 0υ... switch, (
8) Regenerative amplifier, (91--Low pass filter, Mixer, Co., Ltd.)...First band pass filter, (2)...Second band pass filter, ( To)
...first detector, αΦ...second detector, (to)
...Subtractor, (to)...Inverting amplifier, (2)...
・Output terminal, αω...first frequency generator, ■...
Rotary transformer, magnetic head,
■・・・Delay circuit, 匈・Second frequency generator, ■・
...Amplifier, (to)...Input terminal for signal indicating insert editing mode, cIl, (to)...Logic circuit, (To)...Input terminal for signal indicating insert editing preparation mode, (to) ), Ol, (4G...sample hold circuit, @, @...sample pulse creation circuit. In addition, the same reference numerals in the diagram indicate the same or equivalent parts. Agent Masuo Oiwa's procedural amendment (buro style) Showa 5 Kiyomi November 21st 1, Incident Indication Patent Application No. 51 I-09,9789 2,
Title of the invention: Magnetic recording and reproducing device 3. Person making the amendment: Representative: Hitoshi Katayama Department: 4: Agent: Month 30, 1980 (shipment date) 6. Column. 7. Contents of amendment A. Specification: (1) Page 26, line 7; "(A) to (C)" will be deleted. that's all

Claims (7)

[Claims] (1) Recording and reproduction are performed by superimposing a pilot signal on the information signal that constitutes the recording pattern that is inclined with respect to the longitudinal direction of the magnetic tape, and tracking errors are detected using the reproduced pilot signal to control tracking of the magnetic head. A magnetic recording/reproducing apparatus configured to do this has at least one magnetic head in addition to a normal recording/reproducing head, and when performing insert editing, the recording/reproducing apparatus performs recording/reproducing based on the reproduction signal from the newly provided magnetic head. A magnetic recording/reproducing apparatus characterized in that the recording/reproducing head is configured to track a pattern. (2) a first cyclic frequency generator that generates a pilot signal to be superimposed on the information signal; a second cyclic frequency generator that sequentially generates frequencies corresponding to the rotational position of a newly installed magnetic head; This newly established 4th hill #9, Ri
LF Ya h Tomiza shi, h L, S no book, li k layer LL. a mixer for mixing the signal generated by the second cyclic frequency generator; a hand-pass filter for extracting a difference frequency component between the regenerated pilot signal and the second cyclic frequency generator; The magnetic recording and reproducing apparatus according to claim 1, further comprising a detector for detecting the amplitude of the bandpass filter. (3) A cyclic frequency generator that generates pilot number 1δ to be superimposed on the information signal, and a mixer that mixes the signal generated by this cyclic frequency generator with the pilot signal that is reproduced by a newly installed magnetic head. , a bandpass filter that extracts the difference frequency component between the signal of the cyclic frequency generator and the regenerated pilot signal, and a detector that detects the amplitude value of the band pass filter. 2. The magnetic recording and reproducing apparatus according to claim 1, further comprising: means for delaying a timing pulse for generating a frequency of by a predetermined time; and means for sample-holding the output of the detector using the pulse delayed by the predetermined time. (4) The magnetic recording and reproducing apparatus according to claim 1, wherein the newly installed magnetic head is a magnetic head for special reproduction. (5) When insert editing, first track the normal recording/playback head based on the bi-lot signal played back from the normal recording/playback head.
2. A magnetic recording and reproducing apparatus according to claim 1, further comprising means for controlling tracking of a newly installed magnetic head based on a pilot signal reproduced by the magnetic head. (6) The magnetic recording and reproducing apparatus according to claim 1, further comprising means for controlling the tracking of the recording head along one end of the recorded pattern in advance during insert editing. (7) 7 months), □, ffi*he 8,. fart. When the playback head tracks a new recording pattern, the amount of positional deviation according to the head width of the recording head is
2. A magnetic recording and reproducing apparatus according to claim 1, further comprising means for applying a C offset to tracking control of a reproducing head.