DE4217508A1 - Picture precise manual electronic video recording editing device - takes into consideration necessary main recording time and compensates for resulting timing errors - Google Patents

Abstract

The appts. stops the player, during the time of the main recording, for exactly that time. Thus, the recording error time is corrected. The start (CUT-IN) point and stop (CUT-OUT) point are corrected by compensation times. The stop point is recovered by switching out the colour detection of the video signal. The stop point is recovered with the help of an error detection normally associated with the picture content. The colour burst signal of the FBAS signal is used for error detection. USE/ADVANTAGE - Suitable for all TV systems, e.g. PAL, NTSC, SECAM. Simple system for making highly accurate films using existing video devices, without conversion, at low cost and in less time.

Description

Device for accurate manual image electronic editing of video took.

1.2 General

 Video recordings are made by copying selected (marked) pieces of tape of an original volume on a daughter band cut.

1.3 State of the art

Current state of the art is that the original volume marking signals Time code (VITC or Rapid etc.) already added during the recording will. With the help of these picture addresses are the image to be dubbed addresses selected, edited and in a performing run selected dubbed. Here will the recorder ramp-up error The recorder starts moving forward the value of the ramp-up time while running Player compensated.

The player can select new ones Control dubbing picture addresses (far) and will be sufficient Lead time until actually valid Started picture address to continue tet.

The stop point (CUT-OUT) is indicated by The dubbing continues to run Return path of the tape determined. You have to with inexpensive recorders to accept that part of the previous recording without deletion is playing. Here colored Image disturbance after that of the tape return transport disappear.

For recorders in the higher price range, with each revolution of the take-up drum make a deletion, this occurs unsightly disturbance does not arise. This recor they are insert and assemble.

2.1 Criticism of the state of the art

This technique is currently in use very elaborate and has for the studio Operation with high quality video recorders quite its justification.

The industry is currently trying to Code also in consumer devices of the top Integrate price category.

Unfortunately, as always, you are over the top upcoming time code standard disagree on what the end user needs to do this forces to stay with a brand.

You can already shoot video films not in a copy process with Time code, but need to do so  usually an intermediate copy, so that here Copy losses accepted Need to become.

Efforts are currently underway taken, again or afterwards bringable (rewriteable) time stamps generate, which in turn only with tapes the same company is possible. And that too only with devices of the upscale price great.

For the average talent this procedure remains difficult for citizens transparent and is probably more for the tech savvy freaks to keep. (Prestige product).

Another disadvantage of the existing Timecode procedure is that here trying to direct studio technology transfer to consumer devices, though this cheap bulk goods don't have that necessary bandwidth u. Stability.

In addition, this technology for the Average consumer is too expensive.

3.1 problem

The specified in claims 1 and 2 Invention is based on that the use of a time stamp can be dispensed with when using inexpensive video recorder with Errei equal accuracy.

3.2 Goals

The aim of the invention is that before available inexpensive video devices for Post-processing can be used and that the device type is irrelevant.

3.3 further goal

Another goal is that the dubbing in an easy to understand ver drive directly and at drastically redu decorated cost who realized that can.

4.1 Design of the invention

The principle of my invention is from Core designed so simple that Lich on the addition of drawings could be dispensed with.

Fig. 1 shows the timing

Fig. 2 shows the structure of the device.

4.2 Structure

The device I invented consists of a microprocessor control between the dubbing devices
A: PLAYER
B: RECORDER
is switched.

The microprocessor control can involved devices players and recorders operate via infrared (far).

The image signal to be dubbed is looped through the device, and can be changed by this. Likewise, the device can be opened the presence of the above Color burst detection react.

There are 4 input keys in the device available for manual operation.

Key 1 is for selecting the starting point intended.

Key 2 is for selecting the stop point intended.

Key 3 is used for learning adaptation for IR remote controls.

Key 4 switching between feeder and pickup There is also an adjustment button for the entry of time values integrated.

5.1 Cutting process

The control works with the use of compensation times for
A: Recorder start-up time
B: Recorder lag time.

5.2 Starting point: (CUT-IN)

About a learning described later the process is the control when pressed button 1 known that the recorder is started for recording, the Zu player but still the recorder ramp-up time must stop shortly before To run the recorder start-up time run, the dubbing then runs as if the player run this time. The receiving one Recorder could during the recorder Take up nothing, and has the still image of the player cannot record. Shortly before expiration the "blindness" of the recorder 2 pictures the player runs as described above and the recording recorder accepts now the current image of the player on. The absence during the recorder ramp-up is hereby compensated.

5.3 Stop point (CUT-OUT)

If the dubbing is now a time has been running for a long time with the help of Key 2 of the (stop point [CUT-OUT]) can be selected. The recording is running with changed image content still the "Recorder run-on time" continues.

The change in image content will through the invented, device he testifies.  

5.4 Changes

1. The playback picture is dark switches.

2. The color content is blocked.

3. The 4.43 MHz color burst signal locked out (filtering) while the synchronous mix H and V Sync remains unchanged.

5.5 Purpose / justification of this measure

Most video recorders follow suit The tape is still finished recording a bit back. This is to be avoided be that between two shots Piece of blank tape is created. That means the end of the front previous recording with the start of the new Recording without deletion via is written. As a result, the Interface colored streaks visible. You chose this compromise, because these color disorders are more tolerated be as noise.

To determine the stop point is this manufacturer's compulsory error but extremely unfavorable.

To the value of the recorder side. Tape back transports, the admission is extended. This is after the recorder side Return transport, the belt exactly on the Place of the stop point.

This is the recorder withdrawal time (after term), which is thus compensated.

Because the recording is still this Compensation time is longer double recording, not yet sides, but only the exact stop Point recovered. The streaks of color occur anyway.

5.6 theory

When recording color video Signals use some tech African tricks.

The luma signal is called frequency mod lation, (digital) the color signal as a mixed down (folded) analog signal recorded.

The frequency-modulated Luma signal can without interference, without deletion over be written in the case of analog color signal is not possible, but the additional new recording will magnetically added to the old recording.

The streaks of color are special because of this annoying because the old image content is not is exactly in sync with the new recording. (Jitter, frequency deviation).  

Because inexpensive video recorders do not rotate another had to be deleted Way to be found.

If you prevent that during the time, where the inclusion for compensation is still the recorder run-on time continues, color information is still recorded, remains the band for the field of Color information deleted.

It will be during this lag time only the black content of the sync mixture recorded that itself can then be overwritten without interference. So the stop point is trouble-free, compensated, determinable.

6.1 Part 2 of my invention

Since this cutting Manual device system it is obvious that the user takes a few cuts to then to decide whether to cut further should.

Another case is conceivable.

Because in the cutting break while the manually searched for a new starting position will pass more than 5 minutes would, the head drum protection Address triggering of the video recorder, and the connecting point would be lost.

As described in 5.4 remains behind the last cut a piece of black Synchronous mix without 4.43 MHz burst signal left.

The recorder is now used as a player operated for recording review.

The absence of the burst is from the front direction recognized. At the end the black ID is stopped, and on Record / pause function set. Like at the stop point when cutting, the recorder now takes over slavishly, due to construction, the reverse trans port of the tape to the last stop point. The stop point is thus regained.

7.1 Learning process / adaptation

So that the device the recorder times A: / B: these times are known specified via the timer actuator.

Through the 2 times, in quick succession then press the learn button and button 1 for ramp-up time this set time value takes over men, and by taking a trial averages whether the time is right or changed must become.  

The recorder run-on time is also learned in the same way, only that the Assignment of this time value using key 2 he follows.

If the learn button was only pressed once, becomes the learning process for the IR far inflation triggered.

In addition, the function key z. B. again key 1 for coding "REC" Assigned (recording).

Here, the device on the recorder's own remote control appropriate coding played that then is registered.

The coding is now on key 1 Known for admission and is in the snow Operation when button 1 is pressed sequence correctly to the one to be controlled VCR broadcast.

Learning remote control coding for key 2 works the same way, only with the audition of the second, necessary Coding, in this case "PAUSE".

This remote control learning must also repeated for the player will. To do this, press button 4 to switch the device on chosen. In this case the player and the whole thing has to be done with the remote control of the player are repeated.

There will be pause on key 1 and play on Key 2 learned.

After this adjustment is complete Device ready for cutting Videotapes.

Claims (2)

1. Device for accurate, manual, electronic cutting of video recordings, taking into account the technically necessary recorder start-up time and the compensation of the resulting time error.
The Invention is characterized in that during the time of the recorder ramp-up, the player also required for the electronic editing is stopped for exactly this time and thus this recording missing time is corrected. Start (CUT-IN) point. 2. Device according to claim 1, characterized in that the Rückge Win the stop (CUT-OUT) point with Help with a missing identifier, the norma may belong to the image content. The color burst is a misidentification CVBS signal used. To protect is the limit switching this Stop recovery signal Point by counting the pictures or similar, without COLOR-BURST 12 vibrations 4.43 MHz per line CCIR-PAL-NORM. Further characterized in that this corrected cutting process with Standard video devices without modification can be performed.