JP2593861B2 - Editing and recording device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention will be described in the following order.

A Industrial Field of Use B Summary of the Invention C Prior Art D Problems to be Solved by the Invention E Means for Solving the Problems F Function G Embodiment G ₁ Description of the Rotating Head Device (FIG. 2, FIG. 3 view) description of G ₂ recording reproducing apparatus (FIG. 1) G ₃ edit description of the recording operation (Fig. 1, Fig. 4) field of the effect a industrial H invention as the invention example 8 mm video The present invention relates to an editing / recording apparatus which is applied when so-called insert recording or the like is performed on a tape in which a tracking pilot signal whose frequency is sequentially and cyclically changed for each tracking is frequency-multiplexed and recorded on an information signal by a rotary head. .

B SUMMARY OF THE INVENTION The present invention relates to a rotary head type recording / reproducing apparatus employing a tracking system such as 8 mm video, in which a rotary head preceding the rotary head is provided in addition to the main recording rotary head. (Reproducing), while performing tracking control by a reproducing pilot signal from the read-ahead rotary head, and performing editing recording such as insert recording on a recorded tape by a main recording rotary head. The track after editing and recording is formed so as to be correctly overlapped with the original recording track, and the tracking is not disturbed in the edited recording portion during reproduction.

C. Prior Art In a VTR, there is often a need to perform so-called insert editing in which another image is later inserted into a predetermined portion of a recorded tape.

In this insert editing recording, for example, as shown in FIG. 4, a recording track between a desired point INP and OUP on a recorded tape is rewritten with a signal of another image content. In this case, If the track after editing and recording does not correctly overlap the previous recording track, during playback, tracking will be disturbed at points INP and OUP at the joint where editing and recording are performed, and the reproduced image will be disturbed. Therefore, at the time of edit recording such as insert edit recording, reproduction tracking servo is performed, and the recording head is performed just before the recording track.

In a conventional 1 / 2-inch home VTR, a control signal track is recorded at the end of the recorded tape in the width direction, and the control signal is reproduced from the control signal track by a fixed magnetic head. The insert edit recording is performed by the rotary head while performing the tracking servo using the reproduction control signal.

D Problems to be Solved by the Invention By the way, the tracking servo system adopted in the 8 mm video does not use a control track and a fixed magnetic head, but uses a video signal rotating head and a tracking pilot signal frequency-multiplexed with the video signal. Use This pilot signal cannot be extracted unless the rotating head is used as a reproducing head. For this reason, when the rotary head is used as a recording head to perform the assert edit recording in the 8 mm video, the tracking servo using the pilot signal from the recorded tape cannot be performed.
Substantially no accurate insert edit record could be made.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a recording / reproducing apparatus employing a tracking servo system using a pilot signal which is frequency-multiplexed and recorded together with an information signal by a rotary head as described above so that edit recording such as insert editing can be performed correctly. .

E Means for Solving the Problems In order to solve the above problems, according to the present invention, there is provided a main rotary head for recording and reproduction, and an auxiliary rotary head for pre-reading preceding the main rotary head. In an edit recording device that reproduces a tracking pilot signal recorded together with an information signal by changing the frequency cyclically for each track, performs tracking control, and performs insert edit, the insert edit start point and the end point are determined. A storage means for storing, a tape transport means for rewinding a predetermined amount of tape from the insert editing start point by the editing and recording operation, and a main rotary head or an auxiliary rotary head from the rewind to the insert edit start point. From the start point of the insert editing to the end point based on the tracking pilot signal reproduced by the Tracking servo means for deriving a tracking error signal based on the reproduced tracking pilot signal and supplying the tracking error signal to the capstan motor drive circuit. Edit recording apparatus, wherein the edit recording is started by the main rotary head from the insert editing start point stored in the means, and the edit recording is ended at the end of the insert edit stored in the storage means. I will provide a.

F operation During editing and recording of an insert or the like, the main operation is to obtain a reproduced pilot signal from the preceding head, obtain a tracking error from the reproduced pilot signal, and control the capstan motor based on the tracking error to control the tape traveling speed. The recording rotary head scans on the recording track in the state of just tracking. Therefore, insert edit recording can be performed satisfactorily without changing the track pitch at the joint.

G Embodiment An embodiment of the present invention will be described by taking the case of the above-mentioned 8 mm video as an example.

G ₁ Description of rotary head device FIG. 2 is a diagram of the rotary head device of the embodiment described below as viewed from a direction perpendicular to the rotating surface, and FIG. 3 is a diagram as viewed from a direction parallel to the rotating surface. And HB are main rotating heads for recording and reproducing video signals and PCM audio signals. These rotary heads HA and HB have different azimuth angles from each other,
In addition, they are arranged 180 ° apart from each other. HA ′
Has the same azimuth angle as the head HA, the head HA has the same azimuth angle as the head HB, and the head HB has the same azimuth angle as the head HB. The heads HA 'and HB' are 180 degrees different from each other, and are auxiliary read heads arranged for scanning on the tape.

Then, the head HA 'and HB' are the example of FIG. 3, and rotates at the same rotation plane on the head HA and HB, are arranged in advance by the rotation angle interval theta _1.

Then, a tape 221 is attached to the rotary head device.
It is wound obliquely over the angular range of ゜, and a video signal is recorded and reproduced in a 180 ° rotating head contact section and a PCM audio signal in a 30 ° contact section.

Figure 1 describes the G ₂ recording and reproducing apparatus is an example of a recording and reproducing apparatus using the above-described rotating head device.

In FIG. 1, reference numerals (31A) and (31B) denote recording / reproducing switching circuits, which are supplied with a recording / reproducing switching signal SM from a system controller (100) incorporating a microcomputer. Is switched to the P side.

(32) and (33) are head changeover switch circuits, which are alternately switched between the state shown in the figure and the state opposite thereto every 1/2 rotation period (one field) by a changeover signal RFSW.

As the switching signal RFSW, a 30 Hz pulse PG indicating the absolute rotational phase of the rotary heads HA and HB from the pulse generator (41) is supplied to the switching signal forming circuit (42) and is obtained as a 50% duty rectangular wave signal. . The switching signal RFSW is supplied to the system controller (100), where a PCM area signal indicating a PCM signal recording area is formed. The PCM area signal is supplied to the PCM audio signal processing circuit (60). During the period specified by the PCM area signal, reading and writing of PCM data from the RAM incorporated in the processing circuit (60) are performed.

 First, normal recording will be described.

That is, the input video signal through the input terminal (51) is supplied to the video signal processing circuit (50) for processing, and the output is supplied to the switch circuit (32).

The switching circuit (32) is switched every half rotation of the rotary head by a switching signal RFSW.
And HB are subjected to drum phase servo with the pulse PG as the reference phase, and the video area of FIG.
When the HA scans, a recording video signal is supplied to the head HA through the recording amplifier (34A) and the switch circuit (31A), and is recorded in this video area of the track (4A). Similarly, when the head HB scans over the image area, a recording image signal is supplied to the head HB through the recording amplifier (34B) through the switch circuit (31B) and is recorded in the image area of the track (4B). .

In this case, the switch circuit (32) and the recording amplifier (34A)
And (34B) are provided with adder circuits (52A) and (52B), and a tracking pilot signal is supplied to these adder circuits (52A) and (52B). That is,
(53) is a pilot signal generating circuit for generating a pilot signal of 4 frequency known frequency f ₁ ~f _4, the pilot signal from the generating circuit (53) is supplied to the pilot signal switching circuit (54). Then, a switching signal formed based on the switching signal RFSW from the system controller (100) is supplied to the pilot signal switching circuit (54). Then, from the switching circuit (54), in a section where the head HA scans the tape and the frequency f ₁ and f ₃ are alternately supplied to the addition circuit (52A), the head HB scans the tape section and the frequency f ₂ and f ₄ to the adder circuit (52B) is alternately supplied to each of the pilot signal is recorded as shown in a recording track pattern on the tape T of FIG. 4 in.

In this case, a pilot signal is also recorded in a recording area of a PCM audio signal described later, as shown in the figure.

Further, the left and right channel audio signals are input to the PCM audio signal processing circuit (6) through the input terminals (61L) and (61R).
0), where it is converted to PCM data.

That is, the audio signal is digitized, divided into 132 blocks for each field of the digital signal, P parity and Q parity as error correction codes are generated, and a CRC code is generated for each block. Then, the data for one field is time-compressed to about 1/5 and the block synchronization signal is
The SYNC and the block address signal ADRS are added, and are read out during the period of the PCM area signal formed based on the switching signal RFSW.

The read PCM data "1" is 5.8 MHz.
The signal “0” is modulated into a signal of 2.9 MHz, and the signal “0” is modulated into a signal of 2.9 MHz. The modulated signal is supplied to the switch circuit (32), and by the switching by the switching signal RFSW, the head HA places the track (4B) in the PCM area in FIG. 3 and the head HB places the track (4A) in the area AP. Each is recorded.

During the normal recording, the tape T is transported at a constant speed while being sandwiched between a capstan (11) driven by a motor (12) and a pinch roller (13).

Next, at the time of reproduction, the drum phase servo based on the signal PG is applied also at the time of reproduction.

And the pilot signal of 4 frequencies is track (4A)
Since (4B) is cyclically recorded, the four-frequency pilot signals are used and tracking servo is applied during this reproduction, as described later.

At the time of this reproduction, the reproduction signal outputs from the heads HA and HB are supplied to the switch circuit (33) via the reproduction amplifiers (36A) and (36B), respectively.
By switching 3) by the switching signal RFSW, the video signal from the video area is supplied to the video signal processing circuit (50), and the PCM data from the PCM area is supplied to the PCM signal processing circuit (60).

Then, the video signal processing circuit (50) demodulates the video signal and outputs it to the output terminal (55).

On the other hand, in the PCM signal processing circuit (60), the reproduced PCM signal is obtained by demodulating the data of "1" and "0", which have been modulated as described above, and performing error detection and error correction. Is output to the output terminals (63L) and (63R).

Then, during this normal reproduction, tracking servo is applied as follows.

That is, the reproduction signal from the video area from the switch circuit (33) is supplied to a low-pass filter (71), thereby frequency pilot signal f ₁ ~f ₄ is extracted.
This reproduced pilot signal is supplied to the switch circuit (72). The switch circuit (72) is switched to the terminal E side during editing and recording, which will be described later, and is switched to the terminal N side during normal reproduction. Therefore, the reproduced pilot signal from the low-pass filter (71) is supplied to the multiplication circuit (73) through the terminal N of the switch circuit (72). On the other hand, the pilot signal switching circuit (54) supplies a reference pilot signal according to the switching by the switching signal from the system controller (100). From the multiplication circuit (73), the frequency component Δf _A (Δf _A = | f) of the difference between the reproduction pilot frequency and the reference pilot frequency according to the delay or advance deviation from the just tracking position during the track scanning of the head. ₁₋ f ₂ | = | f ₃ −f ₄ |) and Δf _B (Δf _B = | f ₂ −f ₃ | = | f ₁ −f ₄ |). The difference frequency component Δf _A is a band-pass filter (74A)
And the difference frequency component Δf _B is extracted through a band-pass filter (74B), detected by detection circuits (75A) and (75B), respectively, and the detection output is supplied to a subtraction circuit (76). Is subtracted. This subtraction output is a tracking error, and this tracking error is generated by the system controller (10
0) The capstan motor drive circuit (78) is supplied through the terminal N side of the switch circuit (77) switched by the signal ED from (0), and the tape T is transferred by changing the rotation speed of the capstan motor (12). The amount is changed, and the rotary heads HA and HB are controlled to scan the tracks (4A) and (4B) in the state of just tracking.

For when G ₃ editing of the recording operation described next insert editing recording will be described.

At the time of editing and recording, first, as shown in FIG. 4, on a recorded tape, a start point INP at which new image information is inserted and an end point OUP thereof are obtained, for example, as a count value of a tape counter and stored. . Next, return the tape to the start point INP or slightly return from the start point INP, and press the insert edit recording button to start. Then, under the control of the system controller (100), the fourth
As shown in the figure, the tape is sent, for example, in a reproduction mode until the start point INP. Then, at the start point INP, the tape T is rewound by the time required for the tracking servo to stably operate. The amount of tape to be rewound at this time can be detected as the number of tracks traversed by the heads HA and HB from the envelope of the reproduced high-frequency output at the time of rewinding. Alternatively, the same detection can be made by counting the number of changes in the pilot signal frequency during the head output during rewinding.

After the tape has been rewound for a predetermined time in this manner, the tape is reproduced in the normal reproduction mode from that point. When the tape reaches the start point INP, the switch circuits (72) and () are output by the ED signal from the system controller (100). 77) is switched to the terminal E side. Then, the reproduction outputs of the auxiliary rotary heads HA 'and HB' are supplied to the switch circuit (82) through the amplifiers (81A) and (81B), respectively. The switch circuit (82) includes a switching signal RFS for inverting the state each time the heads HA 'and HB' scan the image areas of the tracks (4A) and (4B).
W 'is supplied, and this switch circuit (82) is alternately switched between the input terminals A and B. That is, since the switching circuit (82), the same as the reproduced signal from the head HA and HB is obtained from the switching circuit (33) is obtained in advanced state just prior rotation angle theta ₁ minute than this. The reproduced output is supplied to a low-pass filter (83) to extract a reproduced pilot signal, which is supplied to a multiplication circuit (73) through a terminal E side of a switch circuit (72). Therefore, the tracking error signal formed from the reproduced pilot signal during the reproduction output of the heads HA 'and HB' is obtained from the subtraction circuit (76). When this tracking error signal is viewed from the rotation phases of the heads HA and HB, the rotation angle θ ₁
Since it has advanced by the amount of time, it is supplied to the delay circuit (79) through the terminal E side of the switch circuit (77), and its rotation angle θ ₁
After being delayed by an amount, the signal is supplied to a capstan motor drive circuit (78) to perform tracking servo. Instead of providing the delay circuit (79), when the heads HA 'and HB' perform just tracking, the heads HA and HB
May be given as an offset to the tracking error voltage supplied to the capstan motor drive circuit (78), according to the amount of deviation from the track (4A) (4B).

When the starting point reaches INP in the above condition, the system controller (10
The recording mode is set by 0), and the switch circuits (31A) and (31B) are connected to the recording side contact R by the signal SM, and the video signal and the PCM audio signal are changed to new contents. At this time, as described above, the switches (72) and (7
7) is switched to the terminal E side, and the tracking servo is applied by the tracking signal formed from the reproduction pilot signal of the reproduction output of the heads HA 'and HB'. Therefore, the heads HA and HB scan on the recording tracks (4A) and (4B) in the state of just tracking to perform recording.

When the end point OUP is reached, the apparatus is stopped and the edit recording mode is released. Even at this end point OUP, the previous recording track and the new recording track overlap, so that the reproduced image is not disturbed at the joint at the time of reproduction.

In playback mode up to the start point, head H
The tracking control based on the reproduction outputs of the heads HA and HB is performed instead of the tracking control based on the reproduction outputs of A 'and HB'.

In the above example, the playback pilot signal from the video area is obtained from the playback output of the heads HA 'and HB', and tracking control is performed.However, tracking control is performed using the playback pilot signal from the PCM area. Of course you can.

However, if only the video signal is to be rewritten and the PCM audio signal is not to be rewritten, the heads HA and HB are controlled by using the reproduced pilot signal from the PCM area during editing and recording without providing the heads HA 'and HB'. The insert recording of only the video signal can be performed while performing the recording.

In the above example, the case where the video signal and the PCM audio signal are replaced by completely separate signals has been described. However, the playback video signal and the playback PCM are output from the auxiliary rotary heads HA ′ and HB ′.
Since an audio signal is obtained, a signal obtained by mixing the originally recorded signal and a new signal can be insert-recorded. However, in the case of a PCM audio signal, it is necessary to decode once and encode again, so that the heads HA ′ and HB ′ need to precede the heads HA and HB by that time, in which case, for example, Fifth
As shown in the figure, heads HA 'and HB'
The HB is shifted not only in the rotation direction but also in the height direction perpendicular to the rotation direction by, for example, d and is advanced by one frame or more.

Note that the present invention is not limited to insert recording, but can be applied to all cases in which editing recording is performed while overlapping the previous recording track.

H Effect of the Invention As described above, according to the present invention, the auxiliary rotary head preceding the main rotary head is provided, and during editing and recording, the main rotary head is controlled while performing tracking control based on the reproduced pilot signal from the auxiliary rotary head. Since recording is performed by the head, there is no track shift not only at the editing start point but also at the editing end point, and the reproduced image is not disturbed at the editing joint at the time of reproduction.

[Brief description of the drawings]

FIG. 1 is a block diagram of an example of the device of the present invention, FIGS. 2 and 3 are diagrams for explaining an example of the rotary head device, FIG. 4 is a diagram for explaining the operation of the present invention, and FIG. The figure is a view for explaining another example of the rotary head device used in the present invention. HA and HB are main recording and reproducing heads, HA 'and HB' are preceding heads, and (71) and (83) are low-pass filters for extracting reproduced pilot signals.

Claims (1)

(57) [Claims] 1. A main rotary head for recording / reproducing, and an auxiliary rotary head for pre-reading preceding the main rotary head, the tracking for which a frequency is cyclically changed for each track and recorded together with an information signal. Regenerate the pilot signal,
In an editing and recording apparatus for performing insert control by performing tracking control, a storage means for storing an insert edit start point and an end point, and an edit recording operation, from the insert edit start point,
A tape transport means for rewinding a predetermined amount of tape; after the rewind, up to the insert editing start point, based on the tracking pilot signal reproduced by the main rotary head or the auxiliary rotary head, from the insert edit start point to the insert edit start point. Up to the end point, a tracking servo means for deriving a tracking error signal based on the tracking pilot signal reproduced by the auxiliary rotary head and supplying the tracking error signal to the capstan motor drive circuit; and By controlling the running, the main rotary head starts editing recording from the insert editing start point stored in the storage means, and ends the editing recording at the end of the insert editing stored in the storage means. An edit recording device characterized by the above-mentioned.