JP3154761B2 - Image reproducing device and image recording device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image reproducing apparatus such as a digital VTR having two different recording and reproducing modes and an image recording apparatus.

[0002]

2. Description of the Related Art With the advent of HDTV, which can obtain images with higher definition than conventional televisions, attempts have been made to produce movies recorded on conventional films on HDTV. By using HDTV, the recording state can be checked immediately after recording, and editing and special effects can be easily performed at low cost.

However, the number of frames per second of a movie is 24 frames, and the number of frames on an HDTV is 30 frames.
When a movie (30 frames) produced by a TV is to be screened, it must be converted to 24 frames using a device that performs a dedicated conversion (for example, conversion according to the 2-3 system). Had become.

To solve this problem, Japanese Patent Laid-Open Publication No.
As disclosed in Japanese Patent Application Laid-Open Publication No. H10-264, an image recording / reproducing apparatus capable of recording / reproducing a movie signal of 24 frames per second by setting the number of rotations of a head drum and the feeding speed of a tape to 24/30 when recording / reproducing HDTV Has been devised. This image recording / reproducing apparatus adds a movie mode for recording and reproducing in 24 frames to a conventional high-definition VTR,
It is based on the idea that by converting a high-definition VTR that originally operates at 30 frames in a movie mode of 24 frames to produce a movie with 24 frames, it is not necessary to convert the number of frames that degrades image quality. .

However, when producing a movie,
In addition to cameras and VTRs, equipment such as editors and effect switchers are required. According to the above-mentioned concept, there is a problem in that all of these devices must be provided with a device that operates in 24 frames, which increases the cost.

[0006]

SUMMARY OF THE INVENTION As described above, the HDTV
VTR as a recording device when using for video production
In a conventional image recording / reproducing apparatus capable of recording an image at 24 frames per second, a special device that operates at 24 frames is also required for a device that provides editing and special effects, resulting in a large capital investment. Was.

The present invention has been made in view of the above points, and an object thereof is to reproduce an image recorded in 30 frames in 24 frames, and to reproduce an image recorded in 24 frames in 30 frames.
It is an object of the present invention to provide an image reproducing apparatus and an image recording apparatus which can reproduce images in frames and provide editing and special effects necessary for movie production, so that 30 conventional frames can be used as they are.

[0008]

According to the present invention, there is provided an image reproducing apparatus and an image recording apparatus, wherein n screen / second image information and m screen / second image information (n,
m is an integer) that can be reproduced and recorded respectively.
Mode and the second mode. The image playback device includes a mode selection unit that selects one of the first mode and the second mode, and a playback unit that plays back image information recorded on the recording medium in the selected mode. When the second mode is selected and time information corresponding to the first mode is recorded together with image information on a recording medium to be reproduced, the time information recorded on the recording medium is Is changed to time information corresponding to the second mode, and the reproduction in the reproduction unit is performed according to the changed time information. On the other hand, the image recording apparatus
A mode selection unit for selecting one of the second mode and the second mode, a recording unit for recording image information on a recording medium in the selected mode, and time information recorded on the recording medium together with the image information. An instruction unit for instructing mode conversion when the mode to be supported is different from the selected mode, and the recording unit receives the instruction from the instruction unit, and Is changed to time information corresponding to the other mode, and the changed time information is recorded together with image information.

[0009]

First, in the above configuration, for example, n is assumed to be 24 which is equal to the number of frames of a movie, and m is assumed to be 30 which is equal to the number of frames of HDTV. According to the present invention, first, when the second mode (30 frames) is selected and reproduced by the mode selection unit, the reproduction process is directly performed on the recording medium on which the image is recorded in 30 frames, and the image is reproduced. Is recorded on 24 frames by converting the recorded time information for 24 frames into 30 frames and reproducing the image according to the converted time information. The reproduced image information signal can be reproduced in the 30-frame mode. And the second mode (30 frames) in the mode selection section
When recording is selected, if a recording medium corresponding to the 30-frame mode is to be created, the recording process is performed as it is, and if a recording medium corresponding to the 24-frame mode different from the selected mode is to be created, the recording medium is By resetting the time information to be recorded together with the input image to that for 24 frames and recording the newly set time information, the image can be displayed in a desired mode regardless of the number of frames of the input image signal. A recorded recording medium can be obtained. The first mode (24 frames) and the second mode (30 frames)
An operation in which all the frames are replaced is also possible.

When producing a movie, this image recording / reproducing apparatus is used to record and edit in a 24-frame mode and reproduce it in a 30-frame mode. This makes it possible to use a conventional editing device or special effect device for 30 frames. If the edited tape is reproduced again in the 24-frame mode, it is possible to efficiently produce a movie without deteriorating the image quality.

[0011]

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 2 is a diagram showing the number of pixels on one screen of the HDTV. The color video signal includes a luminance signal Y and a color difference signal Pr,
This is a Pb component signal, and the signal band of the luminance signal is twice that of the color difference signal. FIG. 2 shows the number of pixels of the luminance signal, and the number of pixels of the color difference signal is half the number of samples in the horizontal direction as shown in parentheses. One screen corresponds to one frame of a television signal, and has 2200 samples in the horizontal direction and 1125 in the vertical direction.
Line, of which 1920 horizontal
Samples and 1035 lines in the vertical direction are effective pixels. In addition, the number of frames is 30 per second in a normal HDTV.
In the case of a frame or movie, the number of frames is 24 frames. The portion other than the effective pixels is blanking information and need not always be recorded.

FIG. 3 shows a tape pattern of a digital VTR. A plurality of segments 302-1 to 30-10 are recorded on the tape 301. Each segment is composed of eight tracks 303-1 to 30-8, and one segment is composed of ten segments.

FIG. 4 is a diagram showing the structure of a head drum. Eight recording / reproducing heads 402 are mounted on the head drum 401 so as to face each other by 180 degrees so that one segment can be recorded by half a rotation. It is configured.

The head drum 401 rotates at 150 revolutions per second when recording and reproducing in a 30 frame mode which is a normal HDTV, and rotates at 120 revolutions when recording and reproducing in a 24 frame mode of a movie. ing.

The feed speed of the tape 403 is set to 4/5 that in the case of recording / reproducing in the 30-frame mode when recording / reproducing in the 24-frame mode, and the track shape on the tape is the same in both modes. Like that.

As described above, in this embodiment, the track shape on the tape, the number of data per screen, the number of data per track, and the number of tracks for recording one screen are the same in both modes. Playback of a tape recorded in the frame mode in the 30-frame mode is also possible. Next, a typical procedure for actually producing a movie will be briefly described.

FIG. 6 shows a configuration for recording an object to be imaged. Both the video camera 501 and the VTR 502 operate in a 24-frame mode. The VTR 502 operates in a 24-frame mode. The tape recorded in the 24 frame mode by the VTR 502 has a V
Set to TR503. Similarly, a tape recorded in another 24 frame mode is set in the VTR 504. The output signals of the VTRs 503 and 504 are connected to the input terminal of an effect switcher 505, and a signal 506 switched by applying a special effect is a VTR 507 for recording.
Is recorded by being connected to the input terminal. These devices 503
To 507 are controlled by the editor 508.
The timing reference required for control is a time code signal supplied from each VTR to the editor. Also, since this editing system all operates in 30 frame mode, VTR
Except for the above, conventional HDTV devices can be used.

The edited tape is reproduced by the VTR 9 in a 24-frame mode, and is displayed on the display 10 as it is or printed on a film by the kinerecorder 11.

According to the movie production procedure shown in FIG.
2. The VTR 509 only needs to have a recording / reproducing function of 24 frames. However, VTR503 and VTR504 have 24
The VTR 507 must have a function of reproducing a tape recorded in the frame mode in the 30 frame mode.
A function of recording information of 24 frames while operating in the 30-frame mode is required.

The V of this embodiment which enables such a function
Next, the configuration of the TR will be described. FIG. 1 is a simplified block diagram showing a main part of an image recording / reproducing apparatus (digital VTR) according to the present embodiment. The left half is a part for recording (recording unit 101), and the right half is a part for reproduction (reproduction unit 10).
2).

First, the operation at the time of recording will be described. The recording component signals Y, Pb, Pr are connected to input terminals 1, 2, 3 of the VTR. The respective signals are converted into digital signals by A / D converters 4, 5, and 6, and input to recording signal processing circuit 7. The recording signal processing circuit 7 is shown in FIG.
Is a circuit for converting the effective pixel data of the video signal shown in FIG. That is, here, the effective pixel data is subjected to error correction encoding for error correction together with audio data (omitted in the figure) and control data generated by the control data generator 8, and a synchronization code is added thereto. , And 8 are modulated and supplied to the recording amplifier 9. Recording mode (24 frames or 30 frames) in control data
, A frame number, a track number, a time code, and the like. Recording amplifier (REC.AM
8), the signals of the eight channels which have been current-amplified in the step 9 are sent to the 16 heads (402 in FIG. 4) on the head drum 10 by 180.
The data is switched and supplied every time and recorded on the tape 11.

On the other hand, during reproduction, 16
The signals read from the tape 11 by the heads are input to the preamplifier 12 as eight-channel signals switched at every 180 degrees, and amplified to a level required for subsequent signal processing. 13 is supplied. The reproduction signal processing circuit 13 detects the binary data after compensating for the change in the characteristic received in the process of the electromagnetic conversion by the equalization circuit, compensates for the time axis error, performs the reverse process to the recording, and demodulates the data. After error correction, blanking information is added to obtain video data. The obtained video data is D /
The signals are output to A converters 14, 15, and 16 and converted from digital data to analog signals. The luminance signal Y and the color difference signals Pr and Pb are output to VTR output terminals 17, 18, and 19, respectively.
Output from Next, a portion that carries information on time in FIG. 1 will be described.

A sampling clock in the A / D converter during recording and a timing pulse signal of the recording signal processing circuit 7 are supplied from a recording timing circuit (REC.TIMING) 20. The timing reference of the recording timing circuit 20 is as follows.
Sync separator (SYNC.SEPA.) 2 from input luminance signal Y
1 is the synchronization signal extracted by A timing pulse signal supplied to the reproduction signal processing circuit 13 during reproduction and a conversion clock of the D / A converter are supplied from a reproduction timing circuit (P / B TIMING) 22. The timing reference of the reproduction timing circuit 22 is based on a sync separator (SYNC.S) from an external reference synchronization signal supplied from outside the VTR.
EPA.) 23.

The time code signal indicating the position on the tape must be read not only at the normal reproduction speed, but also at the time of fast-forwarding and rewinding. The time code generator (TGG) 24 receives the initial setting information 25 from the control circuit 34, generates a time code signal, and supplies the time code signal to the recording TC amplifier 26. The recording TC amplifier 26 current-amplifies the time code signal, applies an AC bias thereto, drives a time code head (TC HEAD) 27, and records the time code signal on the tape 11. At the time of reproduction, the signal read from the tape 11 by the time code head 27 is amplified by the reproduction TC amplifier 28 and processed by the time code processing circuit (TCR) 29,
It is output from the time code output terminal 30 to the outside. Since the output from the time code head 27 cannot be obtained when the tape is stopped, the time signal 31 read by the rotating head of the head drum 10 is obtained from the reproduction signal processing circuit 13 instead. I have. The flow of operation according to the case of the apparatus of the present embodiment is described below with reference to FIG.
This will be described with reference to the flowchart of FIG.

When recording is performed in the 24-frame mode as in the case of the VTR 502 in FIG. 6 (S2 recording), the operator of the VTR presses the 24-frame mode button 33 on the control panel (OCP) 32 (S1 Yes). The control panel 32 and the next control circuit 34 constitute a mode selection unit 103. The control circuit 34 supplies a control signal 35 representing the 24 frame mode to necessary circuits described below. By this signal, first, the clock generated by the recording timing circuit 20 is set to 4/24 of the standard HDTV mode (74.25 MHz).
5 and 59.4 MHz, the cycle of the timing pulse becomes 1.25 times (S3), and the image can be processed as shown in FIGS. Then, the control data generator 8 generates a mode signal indicating the recording mode (here, 24 frames) (S4), and sets the time code to a code that makes one cycle in 24 frames (S4). These mode signals and time codes are recorded on the tape through the recording signal processing circuit 7 as described above. Similarly, the time code to be recorded on the longitudinal track on the tape is switched by the time code generator 24 to become a code that makes one cycle in 24 frames (S4). The above control data generator 8
And the time code generator 24 constitute the time information setting unit 104. Further, when a control signal 35 representing a mode (here, 24 frames) from the control circuit 34 is given to the servo circuit 36, the rotation speeds of the drum motor 37 and the capstan motor 38 change, and the drum and the capstan are rotated. The rotation speed is 4/5 of the standard HDTV mode.
That is, the number of rotations of the head drum and the feed speed of the tape are 4
/ 5. That is, the number of rotations of the head drum and the feed speed of the tape become 4/5 (S5). After that, under the above setting, the above-described operation at the time of recording is performed (S
6).

When used as an editing player (S10 playback) like the VTRs 503 and 504 in FIG.
The operator of R presses the 30-frame mode button 39 (S7 Yes) and the conversion button 40 on the control panel 32 (S8 Yes). The convert button 40 is set to 2 as in this case.
A tape recorded in the 4-frame mode is reproduced in the 30-frame mode, and a tape recorded in the 30-frame mode is reproduced as described later.
This button must be pressed to record frame signals.

When the conversion button 40 is pressed, a signal 41 indicating the conversion mode is supplied to the necessary circuits described below.
In a signal recorded in the 24-frame mode, the length of the tape corresponding to the same time is 4/5 of that in the 30-frame mode. The display is 1.25 times faster than normal. This causes inconvenience when operating in combination with another device such as an editing device as shown in FIG. Therefore, the time code processing circuit 29 in this case converts the time code recorded so as to make one cycle in 24 frames into a code which makes one cycle in 30 frames.
The signal is output from the output terminal 30 to the outside (S12), and the operation at the time of reproduction described above is performed (S13).
A tape recorded in the 4-frame mode can be reproduced in the 30-frame mode. The time code processing circuit 29 constitutes the time information changing unit 105.

When operating as an editing recorder as in the case of the VTR 507 in FIG. 6 (S10 recording), the 30-frame mode button 39 (S7 Yes) and the conversion button 40 are set on the control panel as in the case of the above-described reproducing machine. Do (S
8 Yes). The conversion mode signal 41 is supplied to the control data generator 8 and the time code generator 24 in the portion for recording. Even when recording in 30-frame mode, 24
Since the purpose is to produce a frame mode tape, the information on the tape must have the same contents as in the 24 frame mode. 30-frame mode tape contents and 24
The difference from the contents of the tape in the frame mode is that one is a mode signal indicating the recording mode of the control data to be recorded, and the other is a time code signal. Upon receiving the conversion mode signal 41, the control data generator 8 generates a mode signal indicating the 24-frame mode in the recording signal processing circuit 7.
(S11), and converts the time code information that makes one cycle in 30 frames into a code that makes one cycle in 24 frames and supplies the code to the recording signal processing circuit 7 (S12). Similarly, the time code generator 24 converts the data into a code that makes one cycle in 24 frames (S12), and records the code on a longitudinal track on the tape 11. As a result, while the recording operation is being performed in the 30-frame mode (S13), the signal in the 24-frame mode is recorded on the completed tape.

In the editing operation performed by the devices 504 to 508, the length of the tape recorded in the 24-frame mode per unit time is 4/5 of the 30-frame mode. Since the movement is performed at the rotation speed of the drum and the feed speed of the tape, the editing can be performed 1.25 times faster than when editing in the 24-frame mode. In order to clearly show this, the relationship between the time code on the longitudinal track 601 and the video track 602 is made to correspond between (a) when the time code is 24 frames and (b) when the time code is converted into 30 frames. And shown in FIG.

When the tape on which the signal of the 24-frame mode is recorded is simply reproduced in the 24-frame mode (S2 reproduction) as in the VTR 509 of FIG. 6, the switch on the control panel is set to the 24-frame mode button 33. ON (S
1 Yes), the conversion button 40 is turned off. Then, a control signal 35 representing the 24 frame mode is given from the control circuit 34 to the servo circuit 36, and the circuit speed of the drum and the capstan becomes 4/5 of the standard 30 frame mode (S5).

Although not shown in FIG. 6, the standard HD
Needless to say, when recording and reproducing TV signals, 30
The frame mode button 39 is turned on (S7 Yes), and the conversion button 40 is turned off (S8 No), so that normal use (S9) is possible.

In the above embodiment, the VTR 502
24 frames of signals are recorded in 4-frame mode, and VTR503
Plays signals in 24-frame mode in 30-frame mode,
The procedure of recording a signal of 24 frames in the 30-frame mode by the TR 507 and reproducing a signal of 24 frames by the VTR 509 in the 24-frame mode was performed.
To record 30 signals in 24 frames mode,
03, the 30-frame mode signal is reproduced in the 30-frame mode (standard), the VTR 507 records the 30-frame signal in the 30-frame mode (standard), and the VTR 509 reproduces the 30-frame signal in the 24-frame mode. Can also be taken.
When such a procedure is taken, both the 24 frame mode button 33 and the conversion button are turned on in the VTRs 502 and 509.

In the above embodiment, the conversion button is manually turned on / off. However, a mode signal indicating the recording mode recorded on the tape is detected, and the
If the 30-frame mode button is pressed at the time of the frame, a circuit for automatically outputting the conversion mode signal 41 may be provided.

In the present embodiment, a signal having a pixel configuration as shown in FIG. 2 has been described. However, a signal having another pixel configuration may be used as long as the signal amount can be the same per screen. Similarly, even a compressed signal can be applied as long as it uses a compression method that can be completed in one frame or less so that the amount of information per screen is the same. It is needless to say that other embodiments can be applied to the configuration of the head, the configuration of the recording track on the tape, and the like.

[0036]

As described above, according to the present invention, a tape recorded in a 24-frame mode of a movie can be edited in a 30-frame mode of HDTV when producing a movie. The conventional device can be used without preparing a special device of 24 frames for the device, so that the economic effect is large. Also, there is an effect that the editing operation can be performed 1.25 times faster than usual. As described above, a great effect can be obtained in practical use such as realizing an image reproducing apparatus and an image recording apparatus suitable for producing high-definition movies.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an image recording / reproducing apparatus (digital VTR) according to an embodiment of the present invention.

FIG. 2 is a diagram for explaining a recording signal.

FIG. 3 is a view for explaining tracks on a tape.

FIG. 4 is an explanatory diagram of a head drum.

FIG. 5 is a conceptual diagram showing the relationship between the tape and the time code when the time code is converted from 24 frames to 30 frames.

FIG. 6 is a diagram for explaining a movie production system.

FIG. 7 is a flowchart showing the flow of the operation of the apparatus of the present embodiment.

[Explanation of symbols]

1, 2, 3 input terminals 4, 5, 6 A / D converter 7 recording signal processing circuit 8 control data generator 9 recording amplifier 10 head drum 1
Reference Signs List 1 tape 12 preamplifier 13 reproduction signal processing circuit 14, 15, 16 D / A converter 17, 1
8, 19 output terminal 20 recording timing circuit 21, 23 sync separator 22 reproduction timing circuit 24 time code generator 25 initial setting information 26 recording TC amplifier 27 time code head 28 reproduction TC amplifier 29 time code processing circuit 30 time code output terminal 32 Operator control panel 33 2
4-frame mode button 34 control circuit 35 control signal 36
Servo circuit 37 Drum motor 38 Capstan motor 39 30 frame mode button 40 Conversion button 41 Conversion mode signal 101 Recording unit 102 Reproduction unit 103
Mode selection unit 104 time information setting unit 105 time information change unit 301 tape (recording medium) 302-1 to 10 segments 303-1 to 8 tracks 401 head drum 402 recording / reproducing head 403 tape (recording medium) 501, 502, 503 504, 507, 509 V
TR 505 Switcher 508 Editor 5
10 display 511 kineko 601 video track 602 longitudinal track

Claims (2)

(57) [Claims] 1. An image reproducing apparatus having a first mode and a second mode in which the amounts of image information per unit time reproduced from a recording medium are different from each other, wherein the first mode or the second mode A second mode is selected by the mode selecting means, and when time information corresponding to the first mode is recorded on the recording medium together with image information, Reproducing means for changing recorded time information to time information corresponding to the second mode, and reproducing image information recorded on the recording medium in accordance with the changed time information. Image reproducing device. 2. An image recording apparatus having a first mode and a second mode in which the amount of image information per unit time recorded on a recording medium is different from each other, wherein the first mode or the second mode A mode selecting unit for selecting a mode, a recording unit for recording image information on the recording medium in the mode selected by the mode selecting unit, and a mode to which time information recorded together with the image information on the recording medium should correspond When the mode is different from the mode selected by the mode selecting unit, the recording unit includes an instruction unit for instructing mode conversion, and the recording unit receives the instruction from the instruction unit, and selects the mode by the mode selecting unit. An image recording apparatus, wherein time information corresponding to a mode is changed to time information corresponding to another mode, and the changed time information is recorded together with image information.