JP3239878B2 - Progress video editing system and magnetic recording / reproducing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a progressive scan video signal including at least a video signal, an audio signal, and a time code signal, which are transmitted to each other. And a recording / reproducing apparatus.

[0002]

2. Description of the Related Art Heretofore, position control or phase lock of video material between devices constituting an NTSC video editing system has been performed at 30 Hz.

[0003] The reason is that NTSC is an interlaced scanning system, the frame frequency is 30 Hz, and 30 Hz.
Is present in the NTSC system.

There is one problem when introducing a progress video editing system into this industry.

This is because the frame frequency of the progressive scan video signal is 60 Hz, and there is no information of 30 Hz. Therefore, in order to introduce a progress video editing system without any contrivance, it was necessary to replace all the related equipment with equipment corresponding to the progress scanning video signal. One of the ideas is a conventional example described below.
FIG. 3 is a configuration block diagram of a conventional progress video editing system.

[0006] This conventional example is a progressive scanning TV type magnetic recording / reproducing apparatus (hereinafter referred to as VTR) VTR1,
It comprises a VTR 20 of the progressive scanning TV system and an interlaced TV synchronization signal source 5.

When editing video material, the VTR 1 is used as a reproducing device, and the VTR 20 is used as a recording device.

[0008] The interlace TV synchronization signal source 5 outputs an interlace reference signal (hereinafter referred to as I_REF) as a reference for frame position management and the like of the system. I
_REF is 30 Hz synchronized with the interlace synchronization signal
Signal. Devices other than the interlaced TV synchronization signal source 5, ie, the progressive scan VTR 1, the I_REF input terminal 1a, and the progressive scan VTR 20, the I_R
An EF input terminal 20a is provided.

The timing of each device is controlled based on this I_REF, and the entire system is synchronized.

The video output terminal 1e of VTR1 and VTR2
0 is connected to the video input terminal 20b, and at the time of editing the video material, the video signal recorded on the VTR 1 passes through the video output terminal 1e and the video input terminal 20b.
20. Auxiliary data such as audio and time code signals are multiplexed on this video signal. VTR2
0 separates auxiliary data such as multiplexed audio and time code signals from the input video signal, and re-records a new time code on the tape of the VTR 20 simultaneously with the recording of the video signal.

The time code includes the time (hour, minute,
This includes frame data indicating a frame position such as a second) and a frame number, and is used for adjusting the position of the material in the editing work and reproduction of the video material.

The interlace TV synchronizing signal source 5 has an I_R
EF is connected to the I_REF input terminal 1a of VTR1 and VT
It is supplied to the I_REF input terminal 20a of R20. VTR1 and VTR in editing and playback of video material
20 is phase locked at 30 Hz based on this I_REF. Needless to say, VTR1 and VTR20
In addition, peripheral devices not described here also obtain information of 30 Hz from this I_REF and are controlled at 30 Hz.

The progressive scanning TV system will be briefly described (for details, see the broadcasting standards SMPTE292M, SMPTE
296M and SMPTE293M).

SMPTE293M (720x483 Active Lin
e at 59. 94Hz Progressive Scan Production Digital
Representation) is a signal format generally called 525P, which is a 525-line progressive scanning TV.
This is a promising method. 525P has 525 lines (of which 483 effective lines are included) in 1/60 second, and one vertical period, that is, 1/60 second is one frame.

As described above, there is no information indicating the 1/30 second break in 525P.

Also, SMPTE 296M (1280 × 720 Sca
nning, Analog and Digital Representation and Anal
og Interface) is a signal format generally referred to as 720P, and is a promising system as a system TV system of HDTV (high definition television). 720P
Means 750 lines in 1/60 second (of which active line 7
20), and one vertical period, that is, 1/60 second is one frame. Therefore, there is no information indicating the 1/30 second break in 720P.

On the other hand, SMPTE292M (Bit-Serial
Digital Interface for High Definition Television S
ystems) is the Bit-S of the Y luminance signal and the Pb / Pr color difference signal.
This is a transmission format called an erial digital interface (hereinafter abbreviated as SDI), in which a coaxial cable transmits a video signal, an audio signal, and a time code signal. SMPTE293M and SM
The progressive scan video signal in the PTE 296M signal format can be transmitted as a digital serial signal by this SDI.

In a progress video editing system,
The video signal to be handled has a common problem in both the format of 525P and 720P. Therefore, the problem will be described below with reference to 720P.

FIGS. 5 and 6 are excerpts from SMPTE 296M. These signals are a 720P analog signal (FIG. 5) and a 720P digital signal (FIG. 6), both of which are progressive scan TV signals.

FIG. 5 shows an analog signal of the 720P system. The Top Line of the analog video signal of FIG.
6 Line, Bottom Line is 745 Lin
e, Blanking Line is from 746 Line to 750 Line and from 1 Line to 25 Line.

This format is based on Total 750.
Line progressive scan video signal with no information indicating 1/30 second (ie 30 Hz).

FIG. 6 shows a digital video signal of the 720P system. In FIG. 6, the digital signal of the 720P system is S
start Active Video (SAV), End
Line Start and LineEnd of the video signal are managed by Active Video (EAV). Top Line and Bottom Line
Can also be recognized by Start Active Video (SAV) and End Active Video (EAV), respectively.

This format is based on Total 750.
Line progressive scan video signal, but again without information indicating 1/30 second (ie 30 Hz). The format of the interlaced TV signal is 1/60 of the 720P progressive scanning TV signal.
One frame of 1/30 seconds is constituted by two fields of the first field and the second field of the second cycle. further,
In the format of the interlaced TV signal, the synchronization signal formats of the first field and the second field are different from each other, and include information for identifying the first field and the second field.

However, as described above, since the format of the progressive progressive scanning TV signal shown in FIGS. 5 and 6 does not have a field structure, there is no information corresponding to 1/30 second (ie, 30 Hz).

Therefore, in order to introduce a progress video editing system into a video editing system that manages the system based on the information of 1/30 second, the progress video editing system needs to have 1/30 second (ie, 30 Hz). It is necessary to provide an interface TV synchronizing signal source 5 for creating information (I_REF) corresponding to the above.

FIG. 4 shows the progressive scan V in FIG.
It is a block diagram explaining TR20 in more detail.

FIG. 4 will be described below.

During recording, the recording / reproduction switch 14 and the recording / reproduction switch 17 are connected to the REC side. The progressive scan video signal input from the video input terminal 20b is recorded on the tape 25 by the rotary head 12 via the recording amplifier 8 and the recording / reproduction switch 14.

The recording frame detection circuit 7 detects the start point of each frame of the progressive scan video signal.

On the other hand, I_REF input from the I_REF input terminal 20a is input to the reproduction frame detection circuit 11. The reproduction frame detection circuit 11 generates a 30 Hz frame reset signal and outputs the frame reset signal to the recording frame detection circuit 7.

The recording frame detection circuit 7 resets a signal indicating each start point detected from the video input signal by the frame reset signal, and outputs a 30 Hz frame lock signal to the servo circuit 13.

The servo circuit 13 drives the tape drive motor 26 based on the frame lock signal from the recording frame detection circuit 7, controls the running speed of the tape 25,
R20 phase locks the signal recording at 30 Hz.

In this way, the transfer of the progressive scan video signal from the VTR 1 to the VTR 2 can be managed at 30 Hz.

At the time of reproduction, the recording / reproduction changeover switch 14 and the switch 17 are connected to the PB side. The progressive scan video signal reproduced by the rotary head 12 is output from the video output terminal 20e via the recording / reproduction switch 14 and the reproduction amplifier 9. The servo circuit 13 drives the tape drive motor 26 based on the frame lock signal output from the reproduction frame detection circuit 11, controls the running of the tape 25, and the VTR 20 outputs a video signal controlled at 30 Hz.

As is apparent from the above operation, in order to introduce the recording and reproduction of the progressive scanning video signal into a system managed at 30 Hz, a device that outputs a 30 Hz signal and a cable that transmits the 30 Hz signal are used. Is required.

[0036]

In the progress video editing system and the magnetic recording / reproducing apparatus, there is a demand for a simpler system configuration.

According to the present invention, there is no information of 30 Hz,
It is an object of the present invention to lock a phase of a 30 Hz time code signal and a progressive scan TV system video signal in a progressive video editing system that handles a progressive scan TV signal. Also, the present invention provides that 30 Hz information
Non-existent magnetic recording for recording progressive scan TV signal
In a recording / reproducing device, a 30 Hz time code signal and
Locks the phase of the video signal of the logarithmic scanning TV system.
The purpose is to record

[0038]

SUMMARY OF THE INVENTION A progressive video editing system and a magnetic recording / reproducing apparatus of the present invention mutually transmit progressive scan video signals including at least a video signal, an audio signal, and a time code signal, and perform progressive scan TV. A video editing system comprising a plurality of video devices including a recording / reproducing device of a system, wherein each of the devices includes means for detecting a time code signal, and odd and even frame numbers of frame numbers included in the detected time code. Means for generating a signal of half the frame frequency by detecting a frame position of one of the following, and a phase of the frame based on the generated signal of a half frequency of the frame. And means for performing synchronous control.

With this configuration, the time code multiplexed with the progressive scan video signal is converted to the frame frequency of 1
/ 2 (for example, 30 Hz) is generated, and the information corresponding to the 30 Hz is used to lock the relative relationship between the video signal and the position to be recorded on the tape and re-record.

This makes it possible to incorporate a progress video editing system into an interface scanning video editing system without connecting an interface synchronizing signal.

Further, a progressive scanning VTR functioning as a recording device is changed from a progressive scanning VTR functioning as a reproducing device.
The connection to the R is simplified, and the output of the progressive scan VTR acting as a recording device can be directly incorporated into an interface scan video editing system.

[0042]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A progress video editing system and a magnetic recording / reproducing apparatus according to an embodiment of the present invention will be described with reference to the drawings.

In FIG. 1, a progressive scanning recording / reproducing apparatus (hereinafter referred to as VTR) VTR1 is arranged as a reproducing apparatus, and a progressive scanning VTR2 is arranged as a recording apparatus.

The broadcast standard SMPTE292M is a bit-serial digital interface for Y luminance signal and Pb / Pr color difference signal.
This is a transmission format called ce (hereinafter, referred to as SDI). By using this format, a TV signal can transmit a video signal, an audio signal, and a time code signal with one coaxial cable. Generally 5
A TV signal of a broadcast standard SMPTE 293M which defines a format of a progressive scan video signal called 25P and a TV signal of a signal format of SMPTE 296M which defines a format of a progressive scan video signal called 720P can be transmitted as a digital serial signal by this SDI. .

The transmission format of the progressive scan video signal described in this embodiment is preferably a broadcast standard SM.
It is a signal in the SDI format, which is PTE292M or a similar transmission format.

The video output terminal 1e of VTR1 and VTR2
Are connected by a coaxial cable. The VTR 1 of the playback device has a tape on which video signals are recorded in the SDI format, and the VTR 1 of the recording device.
An SDI format video signal is transferred to R2 via this coaxial cable, and the VTR 2 re-records this video signal. When the VTR 2 reproduces and outputs a video signal, the VTR
2 outputs the video signal from the video output terminal 2e.
The VTR1 and VTR2 are connected only by this one coaxial cable.

According to the present invention, synchronous control (synchronous lock) between devices can be performed at 30 Hz only by connecting one coaxial cable. The video signal output from the VTR 2 can be externally managed at 30 Hz.

This will be described in detail with reference to FIG. FIG. 2 is a block diagram illustrating the system VTR 2 in FIG. 1 in more detail.

First, the operation of the VTR 2 during recording will be described.

At the time of recording, the recording / reproduction switch 14,
Reference numeral 18 is connected to the REC side. The progressive scan video signal input from the video input terminal 2b is recorded on the tape 25 by the rotary head 12 via the recording amplifier 8 and the recording / reproduction switch 14. The recording frame detection circuit 7 detects the head position of each frame of the progress scanning video signal. The interval between the detected head positions is 1/60 second (the repetition frequency is 60 Hz).

The time code detection circuit 6 detects a time code signal multiplexed as auxiliary data on the SDI format video signal input from the video signal input terminal 2b. The time code detection circuit 6 generates and outputs a frame signal having a frame frequency from the detected time code signal. Further, the time code detection circuit 6
It determines whether the frame number included in the detected time code signal is an odd number or an even number, and outputs a signal (hereinafter, referred to as a framed signal) according to only the frame whose frame number is an odd number (or even number). Therefore, a framed signal is output every two consecutive frames of the SDI format video signal (every other frame). That is, the framed signal is a 30 Hz signal. Thus, the time code detection circuit 6 outputs a 60 Hz frame signal and a 30 Hz frame signal.

The signal 3 output by the time code detection circuit 6
The new time code based on the framed signal of 0 Hz is output to the time code head 24 via the recording / reproduction changeover switch 18 and recorded on the tape 25. The time code head 24 operates as a time code writer during recording, and operates as a time code reader during reproduction.

The frame detection circuit 10 receives a 60 Hz frame signal output from the time code detection circuit 6 and
The frequency is divided by half, and the time code detection circuit 6
Determines the phase of the frequency-divided signal based on the framed signal that is output. The frame detection circuit 10 outputs a signal of 30 Hz whose frequency is divided and the phase is determined (hereinafter, referred to as a frame reset signal) to the recording frame detection circuit 7.

The recording frame detecting circuit 7 outputs a signal indicating the head position of 60 Hz detected from the video input signal to 30H.
Reset by the frame reset signal of z
A frame lock signal of z is generated and output to the servo circuit 13.

The servo circuit 13 drives the tape drive motor 26 based on the 30 Hz frame lock signal output from the recording frame detection circuit 7 to control the running of the tape 25. Therefore, the position of the rotary head 12 with respect to the tape 25 and the phase of the video signal input to the rotary head 12 are locked by the frame lock signal.

In this manner, the video signal recorded on the tape 25 of the VTR 2 is a signal whose position is controlled by odd or even frames of the SDI format video signal.

Next, the operation of the VTR 2 during reproduction will be described. In FIG. 1, the progressive scanning VTR 2 is arranged as a recording device, but generally has a function as a reproducing device. During playback, the recording / playback switch 1
4 and 18 are connected to the PB side. During reproduction, the progress scanning video signal reproduced by the rotary head 12 from the tape 25 recorded as described above is output from the video output terminal 2e via the recording / reproduction switch 14 and the reproduction amplifier 9.

At the time of reproduction, the time code head 24
Is read out of the time code written on the tape 25 by the time code head 24 at the time of recording, and is output from the TC output terminal 23 via the recording / reproduction switch 18.

At the time of reproduction, the servo circuit 13 outputs a signal output from the rotary head 12 and a time code head 24.
The tape drive motor 26 is driven by a signal 2p generated based on the signal output from the tape drive in the same manner as during recording, and the running of the tape 25 is controlled.

The video signal reproduced from the tape 25 of the VTR 2 in this manner is a signal whose position is controlled by odd or even frames of the SDI format video signal. Although the present embodiment has been described on the assumption that the signal is in the SDI format, the format of the video signal is the SD format.
It is not limited to I. The VTR 2 may output the signal to be output as a signal capable of managing the position of a frame at half the frame frequency (for example, 30 Hz), similarly to other interlaced scanning devices.

Although the phase lock of the system constituted by the two VTRs of the progressive scan video system has been described, it goes without saying that the present invention can be applied to the phase lock between other video editing devices and the like.

Also, it has been described that the frame frequency of the interface scanning video signal is 30 Hz, and the frame position management of the system is performed at 30 Hz. May be performed at 25 Hz. In short, it is only necessary to be １ ／ of the frame frequency.

As described above, when transmitting or editing a video signal between the devices constituting the system, the position management of the video material can be performed at half the frame frequency. That is, according to the present invention, editing of a video signal,
1/2 of the frame frequency obtained from the interlace synchronization signal signal for positioning of video material for copying, transferring, etc.
In a video editing system using a (30 Hz) signal, it is possible to introduce a progressive scanning video device having no information of 1/2 (30 Hz) of the frame frequency.

In transmitting a progressive scan video signal from the VTR 1 to the VTR 2, if two VTRs are located far apart from each other,
The fact that only one cable is required to connect the TR is a great advantage in operating the device.

Furthermore, in the case of the interlaced scanning video signal, since the first field and the second field can be distinguished by the interlace synchronizing signal format, the frame position can be managed at 30 Hz. Progress scan video
The signal does not include 30 Hz information. But,
In the case of the progressive scan video signal of the present invention, it is possible to determine whether the frame number included in the time code transmitted together with the video is odd or even, and to manage the position of the frame at 30 Hz based on the determination.

[0066]

As described above, according to the present invention, time code data multiplexed on a serial digital interface signal between progressive video devices without connecting an interlaced TV synchronization signal. Frame detecting means for detecting a frame signal component from the relationship of the numerical value, odd number, and even number, and means for detecting the field signal component by dividing the detected frame signal by 、, and
Regardless synchronization signal connection, provided with a field phase synchronization means between the devices of the progress VTR3 a recording unit side as a progress VTR2 is a playback unit side, the detected 30Hz phase locking the head position of 60Hz progress video equipment An advantageous effect of control (synchronous lock) is obtained.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a progress video editing system according to an embodiment of the present invention.

FIG. 2 is a block diagram showing the operation of a VTR arranged as a playback device according to the embodiment of the present invention.

FIG. 3 is a block diagram showing a configuration of a conventional progress video editing system.

FIG. 4 is a block diagram showing the operation of a VTR arranged as a playback device in the conventional embodiment shown in FIG. 3;

FIG. 5 is a diagram showing a 720P progressive scan video system analog signal.

FIG. 6 is a diagram showing a 720P progressive scan video system digital signal.

[Explanation of symbols]

1, 2, 20 Progressive scanning video system VTR 1a, 20a Interlace reference signal input terminal
(I_REF) 1e, 2e, 20e Video output terminal 2b, 20b Video input terminal 5 Interlaced TV sync signal source 6 Time code detection circuit 7 Recording frame detector 8 Recording amplifier 9 Reproduction amplifier 10 Frame detection circuit 11 Reproduction frame detector 12 Rotary head 13 Servo circuit 14, 17, 18 Recording / playback switch 24 Time code head 25 Tape 26 Tape drive motor

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H04N 7 / 765,5 / 781 H04N 5/91-5/956

Claims (4)

(57) [Claims] 1. A progressive video editing system comprising: a plurality of video devices including a progressive scanning TV recording / reproducing device for mutually transmitting progressive scan video signals including at least a video signal, an audio signal, and a time code signal. Wherein each of the devices detects a time code signal; and detects one of the odd and even frame positions of a frame number included in the detected time code, thereby detecting 1 / one of the frame frequency. A means for generating a signal having a frequency of 2 and a means for performing phase synchronization control of a frame based on a signal having a frequency which is 1/2 of the generated frame frequency. Editing system. 2. The method according to claim 1, wherein the progress scanning video signal is an SMPT signal.
The progress video editing system according to claim 1, wherein the signal is a signal defined by E292M, SMPTE296M, or SMPTE293M. 3. The apparatus according to claim 2, wherein each of the apparatuses further comprises means for detecting a head position of each frame, and a phase of the signal at the head position is determined based on a signal having a frequency half of the generated frame frequency. 2. The progress video editing system according to claim 1, wherein 4. At least a video signal, an audio signal, and
And a progressive scan video signal including a time code signal.
Receives and records the progress scanning video signal.
Means for detecting a time code signal from a progress scanning video signal, and detecting one of the odd and even frame positions of a frame number included in the detected time code. Means for generating a signal having a frequency of 1/2 of the frame frequency and detecting a head position of 60 Hz, and a servo circuit and a frame frequency having a frequency of 1/2 of the generated frame frequency. 1/2 lap
Video signal and hands by locking the phase of the wave number of the signal
- a magnetic recording and reproducing apparatus characterized by comprising: means for performing phase synchronization control of the relative relationship between the position to be recorded on the flop, and a tape drive motor which is driven by means for performing the phase synchronization means.