JPH06295572A - Editing processing method and editing device - Google Patents

Abstract

PURPOSE:To employ a flying erasure system and enable editing without a residual erasure noise by using a time code recorded in an editing section as a tape address. CONSTITUTION:Time code effectiveness detection processing is performed by reference synchronizing pulses from an interface 17 and ineffective time is switched at the end of the processing. The result is set in a time code use effectiveness flag. Further, a time code processing main microcomputer 12 counts pulses from a 1/n counter 11 to obtain the difference dCTL in the number of pulses between a preceding frame and a current frame. When a tape travels in a positive direction, the difference dCTL is converted into time data, which are added to a register value in the microcomputer 12, but when the tape travels in a reverse direction the data are subtracted. Thus, the register value in the microcomputer 12 and the time code are supplied to an external editing machine through an interface circuit 23 and an output terminal 24.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an edit processing method and an edit apparatus suitable for application to, for example, assemble recording for determining an in-point and an out-point for edit recording and a VTR using a flying erase head during normal recording. .

[0002]

2. Description of the Related Art Conventionally, in editing using a VTR,
There are various forms, and generally, a VTR that provides a video to be edited, a VTR that records the video from this VTR, and a controller that controls these VTRs are used. Two V
For example, one of the TRs is for reproduction and the other is for recording, and the other recording VTR is operated by operating switches.

In any case, the video editing means that a video signal to be edited is phased on a recording medium such as a tape to be recorded at a desired editing start point, and recording is terminated at a desired editing end point. To create a desired video program. For example, in the case of recording a video signal from another VTR on a tape on which a video signal has already been recorded, the last time code of the tape on which the video signal to be recorded is recorded can be read by, for example, a controller. Hold or hold the erased front time code of the tape on which the video signal has already been recorded, and pre-roll based on these held time codes (run the tape from before the editing point)
Then, edit after this.

By the way, when considering recording an input video signal at a desired position of a magnetic tape on which a video signal has already been recorded as one edit, the editing accuracy of the VTR is considerably high (old video signal on the tape). The connection between the track and the new video signal track may be different. In order to explain this, two typical erasing methods that have been conventionally performed will be described with reference to FIGS. 12 and 13.

FIG. 12A is a diagram for explaining a system generally called a flying erase system. As shown in FIG. 12A, in the flying erase system, the magnetic head 3 for recording / reproducing on the drum 2 is used. A head 5 for erasing is mounted separately from the recording and reproducing heads 3 and 4, and a video signal recorded on the tape 1 is recorded and reproduced by the head 5.
This is a method of erasing by scanning similar to that used in, for example, an 8 mm VTR.

FIG. 13A shows a case where editing such as assembling (deciding an in point and an out point and recording desired data during this time) and normal recording / editing are performed in a VTR adopting the flying erase method. Will be described with reference to. In FIG. 13A, T1, T2, T6, T7, and T8 are original recording tracks, and T3, T4, and T5 are recording tracks newly recorded by editing. As shown in FIG. 13A, old tracks T1, T2, T
6, T7 and T8 and new tracks T3, T4 and T5
Are connected in a continuous manner.

FIG. 12B is a diagram for explaining a system generally called a full erase system.
As shown in B, in the full erase system, the fixed head (full erase head) 6 is installed on the running line of the tape 1 without mounting the erase head on the drum 2 (or in addition to the erase head). , This fixed head 6
In this method, all the video signals and the like recorded on the tape 1 are erased (the entire surface of the tape), which is used in a normal VTR or the like.

VT adopting this full erase system
A case where editing is performed by assembling or normal recording in R will be described with reference to FIG. 13B. In FIG. 13B, T1, T2, T6, T7, and T8 are original recording tracks, T4 and T5 are recording tracks newly recorded by editing, and T3 is a new erase track without erasing the original recording tracks. It is a track that has been overwritten by recording a recording track. As shown in FIG. 13B, tracks T6, T7, and T8 are partially erased. Overlap recording tracks are required to maintain continuity.

Judging from the above description, it is quite natural that the flying erase system is superior to the full erase system. However, a VTR adopting the flying erase method, for example, an 8 mm VTR
In, since the video signal, the audio signal, and the time code are arranged and recorded on the recording track in a time division manner,
When a VTR adopting this method is used for editing, the next erase portion (track T5 and track T6) of new information (tracks T3, T4 and T5 in FIG. 13B) assembled like the full erase method is used. while)
Is not formed.

The full erase type V in which the entire erase portion is formed after the assemble or the like shown in FIG. 12B is edited.
In TR, since there is an entire erase portion at the end of editing by assembling or normal recording, the time code of the last recorded video signal is held by, for example, a controller.

Therefore, in the case of re-recording from the last recording track (or a desired recording track) previously formed by the assembly or editing by normal recording, the time code held when the tape is returned is used. By comparing the read time codes, it is possible to return to the position of the recording track formed in the last recording. That is, by holding the time code before the entire erased portion, normal pre-rolling can be performed, that is, recording can be started from a desired in-point.

However, a flying erase type VT shown in FIG. 12A in which the entire erase portion is not formed.
When editing by assembling or ordinary recording in R, there is no full erase part, and the original recorded track exists after the track of the last recorded video signal, so the last recorded video Without holding the time code of the signal, for example, the time code of the video signal originally recorded after the last recorded video signal (see FIG. 13A).
, The track T6, etc.) is read. This is because the capstan and the pinch roller are separated from each other when the recording state is changed to the stopped state, so that the tape moves largely from the end position, and when the recording state is changed to the temporarily stopped state (still), the tape is slightly moved. It is caused by moving from the end position.

Therefore, when the next editing is performed, originally, the pre-roll should be performed on the basis of the time code of the last recorded video signal, but the original recorded video signal next to the last recorded video signal should be recorded. Pre-rolling will be based on the time code, and even though you want to assemble from the track of the last recorded video signal and perform editing by the next assemble or normal recording, the track next to the track of the last recorded video signal will be recorded. , Overwriting from old tracks.

Therefore, conventionally, for example, an 8 mm VTR equipped with only the flying erase head 5 cannot be used for editing, and a VTR adopting the full erase method using the fixed head 6 for erasing or flying. A VTR that employs both a flying erase method using an erase head 5 and a full erase method using a fixed erasing head 6 is used for editing.

[0015]

As is apparent from the above, when the flying erase head of the VTRs used in the past is used for editing using the VTR used for recording, the last recorded track is recorded. Is not held, the time code of the original recording track (track T6 in FIG. 13A) is read, and normal preroll cannot be performed, causing malfunction such as recording from the desired in-point. Since this causes a problem, the VTR that uses the flying erase head at the time of recording is not used for editing, but the VT that uses the full erase method using the fixed head for erasing.
R, or a VTR that uses a fixed erase head and a flying erase head together is used for editing.

However, in a VTR that employs the full erase method during editing by assembling or ordinary recording, the portion that is completely erased becomes noise.

Further, when considering a VTR equipped with only a flying erase head, there is a cost advantage, and as described with reference to FIG. 13A, editing can be performed while maintaining track continuity. Nevertheless, it is difficult to use for editing due to the reasons described above.

The present invention has been made in view of the above points, and it is possible to reduce the cost and edit by making it possible to use even a VTR adopting the flying erase system without any trouble in editing. An object of the present invention is to propose an editing processing method and an editing device capable of improving accuracy.

[0019]

The editing processing method according to the present invention comprises:
Set an invalid section of a predetermined length from the recording end point, interpolate with a hold or pseudo control signal when moving the tape in this invalid section, and record it in the edit section when the tape is returned to the edit section The time code is used as a tape address.

Further, the editing apparatus of the present invention comprises a pseudo control signal generating means 15 for generating a pseudo control signal from the rotation frequency signal of the capstan, the envelope of the reproduction signal and the drum switching pulse, and the time code for extracting the time code from the recording medium. The extraction means 19 and the judgment means 12 for judging the validity or invalidity of the time code supplied after the end of editing based on the data indicating the start and end of editing.
And a calculation means 12 for counting the pseudo control signals from the pseudo control signal generation means 15 to obtain a difference in the number of pseudo control signals of the previous frame and the current frame,
Based on the time code from the time code extraction means 19, the judgment result from the judgment means 12, and the calculation result from the calculation means 12, there is provided a correction means 12 for holding the time code or correcting the time code with a pseudo control signal. It is a thing.

Further, when the time code from the time code extracting means 19 is corrected by the pseudo control signal from the pseudo control signal generating means 15 in the above-mentioned editing apparatus of the present invention, it is read last according to the running direction of the tape. The addition or subtraction is performed by the effective time code and the calculation result from the calculation means 12.

In the editing method of the present invention, an invalid section having a predetermined length is set from the recording end point, and when the tape is moved within the invalid section, interpolation is performed by a hold or pseudo control signal to return the tape to the edit section. At this time, the time code recorded in the edited section is used as the tape address, and the tape address after the just track is invalidated.

Further, in the above-described editing method of the present invention, the phase is adjusted by matching the phase of the control signal assumed when the track becomes a just track with the phase of the rotation frequency signal of the capstan.

Further, the editing apparatus of the present invention comprises a pseudo control signal generating means 15 for generating a pseudo control signal from the rotation frequency signal of the capstan, the envelope of the reproduction signal and the drum switching pulse, and the time code for extracting the time code from the recording medium. The extraction means 19 and the judgment means 12 for judging the validity or invalidity of the time code supplied after the end of editing based on the data indicating the start and end of editing.
And a calculation means 12 for counting the pseudo control signals from the pseudo control signal generation means 15 to obtain a difference in the number of pseudo control signals of the previous frame and the current frame,
Based on the time code from the time code extracting means 19, the judgment result from the judging means 12 and the calculation result from the calculating means 12, the time code is held, the time code is corrected by a pseudo control signal or the capstan rotation frequency signal is used. It has a correction means 12 for performing correction.

Further, in the above-described editing apparatus of the present invention, the correction by the rotation frequency signal of the capstan is such that the phase of the rotation frequency signal of the capstan is matched with the phase of the control signal at the time of the just track assumed during the phase adjustment period. It is done.

[0026]

According to the above-described method of the present invention, an invalid section having a predetermined length is set from the recording end point, and when the tape is moved within the invalid section, interpolation is performed by the hold or pseudo control signal to edit the tape. When returned to the inside, the time code recorded in the editing section is used as the tape address.

According to the configuration of the present invention described above, the capstan rotation frequency signal, the reproduction signal envelope,
The pseudo control signal generating means 15 generates a pseudo control signal from the drum switching pulse, the time code extracting means 19 extracts the time code from the recording medium, and is supplied after the end of editing based on the data indicating the start and end of the editing. Means 1 to judge whether the time code is valid or invalid
2 determines and counts the pseudo control signals from the pseudo control signal generating means 15 to calculate the difference between the numbers of the pseudo control signals of the previous frame and the current frame.
, The time code from the time code extraction means 19,
Based on the judgment result from the judgment means 12 and the calculation result from the calculation means 12, the correction means 12 performs holding of the time code or correction of the time code by a pseudo control signal.

Further in the above, according to the configuration of the present invention,
When the time code from the time code extraction means 19 is corrected by the pseudo control signal from the pseudo control signal generation means 15, the valid time code read last according to the running direction of the tape and the operation means 12 from the arithmetic means 12. Addition or subtraction is performed with the calculation result.

Further, according to the above-described method of the present invention, an invalid section having a predetermined length is set from the recording end point, and when the tape is moved within this invalid section, the hold or pseudo control signal is interpolated to edit the tape. When you return to the section,
The time code recorded in the edit section is used as the tape address, and the tape address after the just track is invalidated.

Further, according to the method of the present invention described above,
Phase adjustment is performed by matching the phase of the capstan rotation frequency signal with the phase of the control signal that is assumed when the track becomes a just track.

According to the above-mentioned configuration of the present invention, the rotation frequency signal of the capstan, the envelope of the reproduction signal,
The pseudo control signal generating means 15 generates a pseudo control signal from the drum switching pulse, the time code extracting means 19 extracts the time code from the recording medium, and is supplied after the end of editing based on the data indicating the start and end of the editing. Means 1 to judge whether the time code is valid or invalid
2 determines and counts the pseudo control signals from the pseudo control signal generating means 15 to calculate the difference between the numbers of the pseudo control signals of the previous frame and the current frame.
, The time code from the time code extraction means 19,
Based on the judgment result from the judgment means 12 and the calculation result from the calculation means 12, the correction means 1 for holding the time code, correcting the time code by a pseudo control signal, or correcting the rotation frequency signal of the capstan.
Do in 2.

Further in the above, according to the configuration of the present invention,
The capstan rotation frequency signal is used to correct the phase of the capstan rotation frequency signal to match the phase of the control signal for the just track that is expected during the phase adjustment period.

[0033]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the editing processing method and editing apparatus of the present invention will be described in detail below with reference to FIG.

In FIG. 1, reference numeral 10 denotes an input terminal to which a capstan FG (frequency signal) from a VTR main circuit adopting a flying erase system such as an 8 mm VTR (not shown) is supplied. The capstan FG supplied via the is supplied to the 1 / n counter 11.

This 1 / n counter 11 is a pseudo C which will be described later.
Under the control (for example, preset) of the TL microcomputer (microcomputer) 15, the capstan FG is counted for 32 waves, for example, and 1 pulse is output. This is performed in order to generate a pulse of 1 CTL cycle because 32 waves of capstan FG are supplied. The pulse of this 1 CTL cycle is supplied to the time code processing main microcomputer (microcomputer) 12.

Reference numeral 13 is an input terminal to which the RF envelope pulse from the VTR main circuit is supplied, and reference numeral 14 is an input terminal to which the drum switching pulse is supplied similarly as described above. The RF envelope pulse supplied via the input terminal 13 and the drum switching pulse supplied via the input terminal 14 are supplied to the pseudo CTL microcomputer 15, respectively.

The pseudo CTL microcomputer 15 generates a pseudo CTL pulse based on the RF envelope pulse and the drum switching pulse, and supplies this pseudo CTL pulse to the time code processing main microcomputer 12.

Reference numeral 16 is an input terminal to which a reference synchronizing signal from a VTR main circuit (not shown) (or an external editor) is supplied, as described above. The reference synchronizing signal supplied via this input terminal 16 is an interface circuit 17. Is supplied to. The interface circuit 17 converts the reference synchronization signal supplied through the input terminal 16 into a pulse, and the converted reference synchronization pulse is processed by the time code processing main microcomputer 1
Supply to 2.

Reference numeral 18 denotes an input terminal to which a time code is supplied from a VTR main circuit (not shown) as described above, and the time code supplied via this input terminal 18 is supplied to the time code processing section 19. The time code processing unit 19 supplies the time code supplied via the input terminal 18 as data to a communication microcomputer (microcomputer) 20 described later. The communication microcomputer 20 supplies the time code from the time code processing circuit 19 to the time code processing main microcomputer 12. The time code processing main microcomputer 12 will be described later in detail.
A signal is output to the interface circuit 21 in synchronization with the 1/2 VD reference sync pulse from the n counter to control the video signal, audio signal and time code to be recorded on the tape.

Reference numeral 21 is an editing interface circuit which obtains a timing pulse based on a control signal from the time code processing main microcomputer 12 and outputs it to an output terminal 22.
Via an external editor.

Reference numeral 23 denotes a serial interface circuit such as RS-422, which supplies a control signal from the time code processing main microcomputer 12 to an external editor or the like connected via an output terminal 24.

Next, with reference to FIG. 2, the operation (time code correction) of the VTR shown in FIG. 1 will be described centering on the time code processing main microcomputer 12.

First, in step S100, time code validity detection processing is performed. That is, the end of recording is detected, the invalid time is switched depending on the end of the process, and the result is set in the time code use valid flag. And step S110
Move to.

That is, the interface 17 shown in FIG.
The process is performed based on the reference sync pulse (eg, 1/2 VD) from the above, first, the end of recording is detected, and the invalid time is switched depending on the end of the process. In this process, the tape moves a little when the playback is changed to the still mode, and when the playback is stopped, the capstan and the pinch roller are separated so that the tape moves a lot, so the invalid time of the time code is switched accordingly. The result is set in the time code use valid flag. That is, the invalid time of the time code is switched depending on the mode at the time of stopping. Of course, the invalid time and the like are stored in the ROM (not shown) in the microcomputer 12, for example, as time data according to the ending method.

Here, the time code use valid flag is
At the end of the actual editing, for example, the low level becomes "0", and the margin time low level "0" is maintained in addition to the tape running section. For example, in this example, since the tape stops at the still state at the end of assembly, in addition to the edit delay (delay time of the editing process), the time from the tape reproduction to the still period is taken into consideration.
X 1/2 VD cycle). When the recording is stopped, the time code is invalidated by setting the low level to “0” for 2 seconds, for example. This flag is set to a high level "1" when the power is turned on and is used exclusively for these processes.

In step S110, the difference dCTL between the pseudo CTL values of the previous and current frames is obtained. And step S
Move to 120. That is, the time code processing main microcomputer 12 counts the pulses from the 1 / n counter 11,
The difference dCTL between the number of pulses in the previous frame and the number of pulses in the current frame is obtained.

In step S120, it is determined whether the time code use is valid, and if "YES", step S13.
If 0, the process proceeds to step S150. That is, it is determined from the time code use valid flag whether the time code is valid.

In step S130, it is determined whether or not the time code can be read, and if "YES", step S14.
If 0, the process proceeds to step S160. That is, it is determined whether the time code is supplied from the time code processing circuit 19 via the communication microcomputer 20.

In step S140, the read time code is loaded into the register (master time code register) in the microcomputer. And it ends. That is, the time code supplied from the time code processing circuit 19 via the communication microcomputer 20 is stored in the internal register.

If it is determined to be "NO" in step S120, that is, if the use of the time code is determined to be invalid, the process proceeds to step S150. In step S150, it is determined whether or not the pseudo CTL is used for correction. If “YES”, the process proceeds to step S160, and if “NO”, the process ends.

That is, 2 when the time code is corrected by the pseudo CTL from the pseudo CTL microcomputer 15 (“YES”) and when the time code is held (“NO”).
There are two cases, and the process proceeds to step S160 only when the time code is corrected by the pseudo CTL from the pseudo CTL microcomputer 15 (“YES”). Note that this determination may be made by manually inputting with a switch or the like, or it may be determined in advance on the program whether to correct by pseudo CTL or hold the time code.

In step S160, the difference dCTL is added as time data to the value of the register (master time code register) in the microcomputer based on the tape running direction. And it ends. That is, when the tape running direction is forward (forward direction: FWD), the difference dCTL is converted into time data and then added to the register value in the microcomputer, and the tape running direction is reverse (reverse direction: REV).
In case of, after converting the difference dCTL into time data,
Subtract from the register value in the microcomputer. This is because, in the forward direction, the time code is overrun in the larger direction, and in the reverse direction, the time code is oversized.

The value (time code) of the master time code register in the time code processing main microcomputer 12 obtained in this way is output through the interface circuit 23 and the output terminal 24 shown in FIG. Or is displayed on a display unit (not shown) of a VTR to which the circuit shown in FIG. 1 is applied.

Next, the operation of the VTR shown in FIG. 1 will be described with reference to the timing chart of FIG.
FIG. 3A shows a reference synchronization signal (1/2 VD) supplied to the interface circuit 17 through the input terminal 16. The section indicated by t1 is the edit section, and the section indicated by t2 is the tape running section (when the tape is stopped). Movement, that is, overrun). 3B is an edit execution control signal generated by the time code processing main microcomputer 12 based on a signal indicating edit execution supplied from an editing machine (not shown) via the input terminal 24 and the interface circuit 23. FIG. A code use valid flag, FIG. 3D is a diagram showing a track pattern on the tape obtained by editing.

As shown in FIG. 3, for example, 8 mm VT
VT adopting a flying erase system like R
When performing assembly or normal recording / editing on a tape on which an input video signal, time code, and audio signal have been recorded by R or the like, if an editing execution command is supplied from an editing machine (not shown) via the input terminal 24 and the interface 23, The time code processing main microcomputer 12 shown in FIG.
The edit execution control signal shown in B is generated.

As a result, as shown in FIG. 3D, a new recording track is recorded at a predetermined position between the sections t4 and t6 in which the previous recording track is recorded, and a recording section t5 of the new recording track is formed. It

On the other hand, the time code use valid flag (FIG. 3C) described in the flow chart of FIG. 2 indicates that the time code is valid at substantially the same timing when the edit section t1 of the reference synchronizing signal (1/2 VD) shown in FIG. 3A ends. High level “1” to low level “0” indicating invalid time code
(Section t3).

In the editing section t2 shown in FIG. 3A, use of the time code is valid, and when the time code can be read, the read time code is edited via the interface circuit 23 and the output terminal 24 (not shown). Supplied to the machine. When the time code cannot be read, as described above, when the tape traveling direction is forward (forward direction: FWD), the difference dCTL
Is converted to time data and then added to the register value in the microcomputer.

When the tape running direction is reverse (reverse direction: REV), the time code obtained by converting the difference dCTL into time data and then subtracting it from the register value in the microcomputer is the interface shown in FIG. A VT to which the circuit shown in FIG. 1 is applied or which is supplied to an external editing machine (not shown) through the circuit 23 and the output terminal 24.
It is displayed on a display unit or the like (not shown) of R.

Therefore, after assembling as shown in FIG. 3D and editing by ordinary recording, the time code is the read time code or the pseudo C of the previous frame.
Since the time code corrected by the difference dCTL between the TL and the pseudo CTL of the current frame is held, the time code of the original recording track, such as the next recorded track or the next recorded track, is read. Will not be lost.

As described above, in this example, the invalid time of the time code is changed according to the editing end mode, and the time code read within the valid period of the time code or the pseudo CTL of the previous frame and the current frame are read. Since the time code corrected by the difference dCTL of the pseudo CTL is held, it is possible to adopt the flying erase method, so that the editing without the unerased noise can be performed and the VTR of the flying erase method can be applied to the conventional editing system. Can be used, which allows cost reduction and more accurate editing.

By the way, when the video track recorded on the tape is a straight line, there is no guard band, there is no dropout, and there is no tape pass defect, the above processing may be left unchanged. If any one is missing, the RF envelope pulse is naturally affected. When the RF envelope pulse is affected, as described above, the pseudo CTL microcomputer 15 shown in FIG. 1 uses the RF envelope pulse supplied via the input terminal 13 and the drum supplied via the input terminal 14. Since the pseudo CTL signal is obtained based on the switching pulse, this pseudo CTL signal contains a phase error.

If the pseudo CTL signal includes a phase error, there is a possibility of causing a malfunction such as a phase lock on an adjacent frame during phase adjustment.

FIG. 4 illustrates one of the several factors mentioned above. FIG. 4 shows changes in the RF waveform due to tracking deviations in the backward search and the forward search at 1 × speed or less.

As shown in the figure, when the video head scans in the direction shown by the solid line arrow, the scanning locus becomes as shown by the chain double-dashed line. The switching pulse at this time is as shown in FIG. 4B. If a dropout or a tape pass defect occurs at this time, the RF level drops extremely as shown in FIG. 4C. That is, if there is no dropout or tape path, the shape should be the second one in FIG. 4C, but the RF envelope pulse with a lowered level as shown at the beginning in FIG. 4C. The waveform shown in FIG. 4D is the waveform of the CTL signal which is assumed to be recorded on the magnetic tape 8.

Here, the case where the head scans along the locus s1 will be described. Focusing on the entrance portion of the drum, between the switching pulse shown in FIG. 4B and the RF signal shown in FIG. 4C or the virtual CTL pulse p1 shown in FIG. 4D. Since there is no phase shift and the just tracking is performed, the RF level is highest at the first portion of the portion where the mesh portion of the track and the locus s1 of the head overlap, and the tracking deviates, that is, the mesh portion of the track. The RF level decreases as the overlapping portion of the locus s1 of the head decreases.

The case where the head scans along the locus s2 will be described next. At the portion where the head starts scanning the magnetic tape 8, the switching pulse shown in FIG. 4B and the RF signal shown in FIG. 4C or the virtual CTL shown in FIG. 4D are shown. Since the phase between the pulses p2 is shifted by 90 degrees, and it is not a just track, the RF level is small, and when the head scans to a position approximately in the middle of the track, that is, the part where the mesh part of the track and the track s2 overlap. Is the maximum tracking, the RF level is the highest.

Next, the case where the head scans along the locus s3 will be described. At the portion where the head starts scanning the magnetic tape 8, the switching pulse shown in FIG. 4B and the RF signal shown in FIG. 4C or the virtual CTL shown in FIG. 4D are shown. Since the phase between the pulses p3 is 180 degrees out of phase and is not in a just track, the RF level is small, and when the head scans to the upper end of the track, that is, the part where the mesh part of the track and the locus s3 overlap is the maximum. By the way, since it is just tracking, the RF level becomes the highest.

The case where the head scans along the locus s4 will be described next. At the portion where the head starts scanning the magnetic tape 8, the switching pulse shown in FIG. 4B and the RF signal shown in FIG. 4C or the virtual CTL shown in FIG. 4D are shown. Since the phase between the pulses p4 is shifted by 270 degrees and is not a just track, the RF level is small, and even when the head scans to the upper end of the track, there is almost no overlap between the mesh portion of the track and the locus s3. The overall RF level is low.

As can be seen from the above description, when a dropout or a tape pass defect occurs, the RF level is extremely lowered and the like. Further, the tracking state can be detected by observing the RF level. This is R in the part corresponding to the drum entrance
By observing the F level, the CTL at that moment
Position of head on CTL track, that is, virtual CTL
Indicates that the phase of can be detected.

FIG. 5 shows the relationship between the RF level and the CTL phase at this time. As shown in FIG. 5, during reverse search and forward search at 1 × speed or less, the RF level should be maximized when the CTL phase is 360 degrees and 0 degrees, but dropout, tape pass, etc. As a result, the level becomes small (the upper left end and the lower end are rounded in the figure), the level gradually decreases from 360 degrees to 180 degrees, and the level gradually increases from 180 degrees to 0 degrees.

Next, with reference to FIG. 6, the relationship between the tracking state and the RF waveform when the double speed reproduction is performed in the forward direction will be described.

Explaining the case where the head scans along the locus s5, focusing on the entrance of the drum,
The switching pulse shown in FIG. 6B and the RF shown in FIG. 6C
Since there is no phase shift between the signal or the virtual CTL pulse p5 shown in FIG. 6D and just tracking is performed,
The RF level is the highest at the first part of the portion where the mesh portion of the track and the locus s1 of the head overlap, and tracking is deviated, that is, the overlapping portion of the mesh portion of the track and the locus s1 of the head decreases. According to RF
The level goes down.

Next, the case where the head scans along the locus s6 will be described. At the portion where the head starts scanning the magnetic tape 8, the switching pulse shown in FIG. 6B and the RF signal shown in FIG. 6C or the virtual CTL shown in FIG. 6D are shown. Since the phase between the pulses p6 is shifted by 90 degrees and it is not a just track, the RF level is generally small. Further, when the track widths of the tracks are varied or there is a guard band, the RF level becomes extremely low as shown in FIG. 6C.

The case where the head scans along the locus s7 will be described next. At the portion where the head starts scanning the magnetic tape 8, the switching pulse shown in FIG. 6B and the RF signal shown in FIG. 6C or the virtual CTL shown in FIG. 6D are shown. Since the phase between the pulses p7 is 180 degrees out of phase and is not in a just track, the RF level is small, and when the head scans to the upper end of the track, that is, the part where the mesh part of the track and the locus s7 overlap is the maximum. By the way, since it is just tracking, the RF level becomes the highest.

Next, the case where the head scans along the locus s8 will be described. At the portion where the head starts scanning the magnetic tape 8, the switching pulse shown in FIG. 6B and the RF signal shown in FIG. 6C or the virtual CTL shown in FIG. 6D are shown. Since the phase between the pulses p8 is shifted by 270 degrees and it is not a just track, the RF level is small, and when the head scans to the middle position of the track, the part where the mesh part of the track and the locus s8 overlap is the maximum. Is R
The F level is the highest.

However, as shown in FIG. 6A,
Since the track scanned like the locus s8 is bent at the lower side, the RF level drops as shown in FIG. 6C (the left half of the fourth RF envelope from the left in FIG. 6C).

FIG. 7 shows the relationship between the RF level and the CTL phase at this time. As shown in FIG. 7, at the time, the RF level during double speed reproduction in the forward direction is C level.
It should be the maximum when the phase of TL is 0 degree and 360 degrees, but if there is track variation or a guard band, the level has fluctuated as a whole as shown by the broken line in the figure. Will be.

By the way, in this case, the relationship between the RF level and the CTL at the time of the still state described in FIGS. 4 and 5 is opposite. This occurs depending on whether the scanning angle of the video head with respect to the video track is large. That is, the difference is whether the lower side of the track is scanned or the upper side is scanned. If the lower side is scanned, the CTL
This is because the area of the track to be scanned becomes larger as the phase of (1) advances, and conversely, if the upper side is scanned, the area of the track to be scanned becomes smaller as the phase of CTL advances.

That is, the pattern shown in FIG. 5 can be used for the backward search and the forward search at 1 × speed or less, and the opposite pattern to the pattern of FIG. 5 must be used for the forward search at 1 × speed or more.

That is, in the forward search at 1 × speed or more, the RF level becomes the maximum when the CTL phase is 0 ° and 360 °, and the level gradually decreases from 0 ° to 180 °, and from 180 ° The pattern is such that the level gradually increases up to 360 degrees.

Although the head for one channel is described here, the same applies to the case of a plurality of channels. However, CTL is generally A
Since the video track of the channel is 0 degrees and the video track of the B channel is 180 degrees, the relationship between the RF level and the CTL phase is also shifted by 180 degrees if the RF level of the B channel is considered.

Therefore, in this example, the processing shown in the flowchart of FIG. 8 is further performed in the configuration shown in FIG.

First, in step S200, time code use invalidation processing is performed. That is, for example, at the time of phase adjustment, when it is detected that the servo is locked by the servo lock information from the interface 23 shown in FIG. 1, the result is set in the time code use invalidation flag. Then, the process proceeds to step S210.

In step S210, the difference dCTL between the pseudo CTL values of the previous and current frames is obtained. And step S
The process proceeds to 220. That is, the time code processing main microcomputer 12 counts the pulses from the 1 / n counter 11,
The difference dCTL between the number of pulses in the previous frame and the number of pulses in the current frame is obtained.

In step S220, it is determined whether the time code use is invalid. If "YES", step S23.
If 0, the process proceeds to step S240. That is, it is determined from the time code use invalid flag whether the time code is invalid.

In step S230, preset permission of the 1 / n counter is issued. Then, the process proceeds to step S260. That is, the time code processing main microcomputer 12 sends the 1 / n counter 11 to the pseudo CTL microcomputer 15.
Allows loading of a preset value (preset value corresponding to the phase when locked) to.

In step 240, the main microcomputer, that is, the time code processing main microcomputer 12 issues a prohibition of presetting the 1 / n counter 11 to the pseudo CTL microcomputer 15. Then, the process proceeds to step S250.

In step S250, the difference CTL of the pseudo CTL value is added to the register value based on the tape running direction in the forward (forward direction: FWD), and the pseudo CTL value in the reverse (reverse direction: REV). Subtract the difference CTL. And it ends.

That is, when the tape running direction is forward (forward direction: FWD), the difference dCTL is converted into time data and then added to the register value in the microcomputer, and the tape running direction is reversed (reverse direction: REV). In the case of), the difference dCTL is converted into time data and then subtracted from the value of the register in the microcomputer. This is because, in the forward direction, the time code is overrun in the larger direction, and in the reverse direction, the time code is oversized.

In step S260, it is determined whether the time code can be read, and if "YES", step S27.
If 0, the process proceeds to step S250. That is, it is determined whether the time code is supplied from the time code processing circuit 19 via the communication microcomputer 20.

In step S270, the read time code is loaded into the register (master time code register) in the microcomputer. And it ends. That is, the time code supplied from the time code processing circuit 19 via the communication microcomputer 20 is stored in the internal register. And it ends.

The value (time code) of the master time code register in the time code processing main microcomputer 12 obtained in this way is output through the interface circuit 23 and the output terminal 24 shown in FIG. Or is displayed on a display unit (not shown) of a VTR to which the circuit shown in FIG. 1 is applied.

Next, the above processing will be further described with reference to FIG.

FIG. 9A shows 1/2 VD, FIG. 9B shows a time code use invalidation flag, FIG. 9C shows the state of the track on the tape, FIG. 9D shows a pseudo CTL signal, point p1 is at the internal servo lock confirmation time point, and point p2 is The standby state at the time of still, the point p3 is at the time of reproduction, the point p4 is at the time of just tracking, and the point p5 is the completion of the servo lock. The interface 23 and the output terminal 24 shown in FIG.
At the point where the phase of the rotation frequency signal of the capstan is fixed, p7 is the acceleration start point, p8 is the servo lock point, t1 is the phase adjustment section, and t is the phase adjustment section.
2 is a servo lock confirmation section, t3 is an edit section, and Tn is a time code use invalid section.

First, at the point s2, that is, in the standby state at the time of the still state, the tape is stopped, so that the head scans the tape pattern so as to indicate the head locus at the position indicated by the point p2. At this time, the pseudo CTL is generated based on the RF envelope pulse and the drum switching pulse, and with correction.

At the time of reproduction shown by the point p3, as is apparent from the locus of the head shown by the arrow at the point p3, the servo is locked and tracking is not completely achieved.

Next, at the time point indicated by the point p4, the just tracking state is established, as is clear from the locus of the head indicated by the arrow at the point p4.
At this point, the time code processing main microcomputer 12 shown in FIG. 1 issues a preset permission to the pseudo CTL microcomputer 15. When the preset permission is issued, the preset value as the pseudo CTL phase at this point is loaded from the pseudo CTL microcomputer 15 into the 1 / n counter 11.

After this point, phase adjustment is performed using the rotation frequency signal of the capstan.

Next, at the point of time indicated by point p5, in order to accurately secure the reference phase viewed from the editing controller, after the above processing is completed, the interface 23 and the output terminal 24 shown in FIG. Information indicating completion of servo lock is output. The phase of the rotation frequency signal of the capstan is fixed at the point p6 with the preset phase at the point of transition and point p4. That is, the rotation frequency signal of the capstan at the time of just tracking is CTL.

Here, the control of the VTR by the editing controller will be described. As shown in FIG. 10B, at the time of editing, the editing controller controls the reproducing device 32 and the recording device 33 via the interface 23 and the input / output terminal 24 shown in FIG. Reproducer 32 and recorder 3
The editing sequence for 3 is as follows.

In rewinding: 1) Pre-rolling (rewinding work) is performed up to 5 seconds before the image used by the reproducing device 32. 2) Similarly, rewinding is performed from the start point of editing and recording on the recording machine 33 to 5 seconds before this. 3) Stand by the stills of the reproducing device 32 and the recording device 33.

Phase adjustment (This may be performed on the reproducing device 32 or the recording device 33. Here, the recording device 3 is performed.
3 will be described below), 1) The editing controller 34 includes a reproducing device 32 and a recording device 33.
A playback command is simultaneously issued to the input terminal 24 via the input / output terminal 24 shown in FIG. 2) The editing controller 34 includes a reproducing device 32 and a recording device 33.
1 time code data synchronized with external reference sync signal
Observe every 2VD and wait until both the reproducing device 32 and the recording device 33 can confirm the servo lock state. 3) Playback device 32 at the time when the servo lock state can be confirmed
And the time difference of the recorder 33 becomes the amount of phase adjustment. When the recording device 33 is behind the reproducing device 32, the editing controller 34 adjusts the phase of the recording device 33 in the acceleration direction. If it is proceeding, the phase is adjusted in the original deceleration direction. 4) The approximate time distribution in the case of the preroll of 5 seconds is as shown in FIG. 10A.

Next, referring to FIG. 11, the phase error and the pull-in position will be described from the view point of the editing controller 34 at the time of phase adjustment.

The editing controller 34 uses 1/2 VD (see FIG.
1A) (see 1A) and the input / output terminal 24 shown in FIG.
The time code data is monitored via. FIG. 11B
If the pseudo CTL shown in (1) is set to the correct phase, the tape time when the servo is locked during reproduction is as shown in FIG. 11C.

FIG. 11D shows the tape time when the lead phase pseudo CTL is within the allowable range with respect to the tape time shown in FIG. 11C, and FIG. 11E shows the tape time when the delay phase is pseudo CTL. That is, if it is within the allowable range Tf, it is within the education standard phase.

However, as shown in FIG. 11F, when the phase of the pseudo CTL exceeds the allowable range, a correction command from the editing controller 34 locks the phase on the adjacent frame.

However, in the present example, as described above, the phase of the capstan rotation frequency signal is matched with the phase of the CTL assumed at the time of the just track, so that the adjacent frame is phased. No phase lock to.

As described above, in this example, the phase of the CTL that is assumed at the time of the just track is matched with the phase of the rotation frequency signal of the capstan so that the phase is adjusted. Even if there is a band or there is a bend in the tape, phase locking will not occur in the adjacent frame.
/ B roll editing can be realized with high accuracy and high reliability and with a simple configuration.

The above embodiment is an example of the present invention.
It goes without saying that various other configurations can be adopted without departing from the scope of the present invention.

[0111]

According to the present invention described above, an invalid section having a predetermined length is set from the recording end point, and when the tape is moved within the invalid section, interpolation is performed by a hold or pseudo control signal to edit the tape. Since the time code recorded in the edit section is used as the tape address when it is returned to the inside, it is possible to adopt the flying erase method, so that it is possible to edit without erasure residual noise. A flying erase type VTR can be used in a conventional editing system or the like, which can reduce costs and perform more accurate editing.

According to the present invention described above, the pseudo control signal generating means generates the pseudo control signal from the rotation frequency signal of the capstan, the envelope of the reproduction signal, and the drum switching pulse, and the time code extracting means generates the time from the recording medium. Extract code, start editing,
Based on the data indicating the end, the judging means judges whether the time code supplied after the end of editing is valid or invalid, counts the pseudo control signals from the pseudo control signal generating means, and controls the previous frame and the current frame. The calculation means obtains the difference in the number of signals, and based on the time code from the time code extraction means, the judgment result from the judgment means and the calculation result from the calculation means, the time code is held or the time code is corrected by a pseudo control signal. Since the correction means is used, it is possible to adopt the flying erase method, so that it is possible to perform editing with no unerased noise, and to use a flying erase method VTR in a conventional editing system,
As a result, it is possible to reduce the cost and perform more accurate editing.

Furthermore, according to the present invention described above, when the time code from the time code extracting means is corrected by the pseudo control signal from the pseudo control signal generating means, the last read valid depending on the running direction of the tape. Since the addition or subtraction is performed between the time code and the calculation result from the calculation means, in addition to the above-mentioned effect, it is possible to always obtain an accurate time code, which enables accurate editing. .

Further, according to the present invention described above, an invalid section having a predetermined length is set from the recording end point, and when the tape is moved within the invalid section, interpolation is carried out by a hold or pseudo control signal, and the tape is edited within the edit section. When it is returned to, the time code recorded in the edit section is used as the tape address, and the tape address after the just track is made invalid, so the flying erase method can be adopted. Since it is possible to edit without erasure noise, it is possible to use a flying erase type VTR in a conventional editing system, etc., which enables cost reduction and more accurate editing. It can be carried out. Further, phase locking to the adjacent frame is eliminated, and so-called A / B roll editing, for example, can be realized with high accuracy and high reliability and with a simple structure.

Further, according to the present invention described above, the phase is adjusted by matching the phase of the control signal assumed when the track becomes a just track with the phase of the rotation frequency signal of the capstan. In addition, high-precision editing can be performed with simple processing.

Further, according to the present invention described above, the pseudo control signal generating means 15 generates a pseudo control signal from the rotation frequency signal of the capstan, the envelope of the reproduction signal, and the drum switching pulse, and the time code extracting means 19 causes the recording medium. A time code is extracted from the time code, and the judgment means 12 judges whether the time code supplied after the end of the edit is valid or invalid based on the data indicating the start and end of the edit, and the pseudo control signal from the pseudo control signal generation means 15 is detected. The arithmetic means 12 obtains the difference between the numbers of the pseudo control signals of the previous frame and the current frame, and calculates the time code from the time code extracting means 19, the judgment result from the judging means 12 and the calculation result from the calculating means 12. Based on the time code hold, pseudo control for time code Since the correction means 12 for performing correction by the signal or the rotation frequency signal of the capstan is used, the flying erase method can be adopted, so that the editing without the unerased noise can be performed and the conventional editing system etc. It is possible to use a flying erase type VTR, which allows cost reduction and more accurate editing. Furthermore, the phase lock to the adjacent frame is eliminated, and the so-called A /
B-roll editing can be realized with high precision and reliability and with a simple configuration.

Further, according to the present invention described above, the rotation frequency signal of the capstan is corrected so that the phase of the rotation frequency signal of the capstan is matched with the phase of the control signal at the time of the just track assumed during the phase adjustment period. Therefore, in addition to the effects described above, highly accurate editing can be performed with a simple configuration.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an embodiment of an editing processing method and an editing apparatus according to the present invention.

FIG. 2 is a flow chart for explaining an embodiment of an editing processing method and an editing apparatus of the present invention.

FIG. 3 is a timing chart provided for explaining an embodiment of the editing processing method and the editing apparatus of the present invention.

FIG. 4 is an explanatory diagram for explaining an embodiment of an editing processing method and an editing apparatus of the present invention.

FIG. 5 is an explanatory diagram for explaining an embodiment of the editing processing method and the editing apparatus of the present invention.

FIG. 6 is an explanatory diagram for explaining an embodiment of an editing processing method and an editing apparatus of the present invention.

FIG. 7 is an explanatory diagram for explaining one embodiment of the editing processing method and the editing apparatus of the present invention.

FIG. 8 is a timing chart for explaining an embodiment of the editing processing method and the editing apparatus of the present invention.

FIG. 9 is an explanatory diagram for explaining one embodiment of the editing processing method and the editing apparatus of the present invention.

FIG. 10 is an explanatory diagram for explaining an embodiment of an editing processing method and an editing apparatus of the present invention.

FIG. 11 is an explanatory diagram for explaining one embodiment of the editing processing method and the editing apparatus of the present invention.

FIG. 12 is an explanatory diagram of an erase method used for explaining a conventional edit processing method and edit apparatus.

FIG. 13 is an explanatory diagram of an erase method provided for explaining a conventional edit processing method and edit apparatus.

[Explanation of symbols]

 12 time code processing main microcomputer 15 pseudo CTL microcomputer 19 time code processing circuit

Claims (7)

[Claims] 1. An invalid section having a predetermined length is set from the recording end point, and when the tape is moved in the invalid section, interpolation is performed by a hold or pseudo control signal, and when the tape is returned to the edit section, An edit processing method characterized in that the time code recorded in the edit section is used as a tape address. 2. A pseudo control signal generating means for generating a pseudo control signal from a capstan rotation frequency signal, a reproduction signal envelope, and a drum switching pulse; a time code extracting means for extracting a time code from a recording medium; Judgment means for judging the validity or invalidity of the time code supplied after the end of editing based on the data indicating the start and end, and the pseudo control signal from the pseudo control signal generating means are counted to determine the previous frame and the current frame. A calculation means for obtaining the difference in the number of the pseudo control signals, a time code hold or a time code based on the time code from the time code extraction means, the judgment result from the judgment means and the calculation result from the calculation means. Compensation hand that compensates with a pseudo control signal for Editing apparatus characterized by having and. 3. When the time code from the time code extracting means is corrected by the pseudo control signal from the pseudo control signal generating means, the last valid time code read according to the running direction of the tape, 3. The editing apparatus according to claim 2, wherein addition or subtraction is performed with the calculation result from the calculation means. 4. An invalid section of a predetermined length is set from the recording end point, and when the B tape is moved within this invalid section, interpolation is performed by a hold or pseudo control signal, and when the tape is returned to the edit section, An edit processing method characterized in that the time code recorded in the edit section is used as a tape address, and the tape address after the just track is invalidated. 5. The editing process according to claim 4, wherein the phase is adjusted by matching the phase of the capstan rotation frequency signal with the phase of the control signal assumed when the track becomes a just track. Method. 6. A pseudo control signal generating means for generating a pseudo control signal from a capstan rotation frequency signal, a reproduction signal envelope, and a drum switching pulse; a time code extracting means for extracting a time code from a recording medium; Judgment means for judging the validity or invalidity of the time code supplied after the end of editing based on the data indicating the start and end, and the pseudo control signal from the pseudo control signal generating means are counted to determine the previous frame and the current frame. And a time code from the time code from the time code extraction means, the judgment result from the judgment means and the calculation result from the calculation means based on the calculation result from the calculation means. Correction by pseudo control signal or Editing apparatus characterized by comprising a correction means for correcting by Tan rotation frequency signal. 7. The correction by the rotation frequency signal of the capstan is performed so as to match the phase of the rotation frequency signal of the capstan with the phase of the control signal at the time of the just track assumed in the phase adjustment period. The editing apparatus according to claim 6.