JPH0793713B2 - Video recording / playback device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video recording / reproducing apparatus, and more particularly to a video recording / reproducing apparatus that uses a memory to perform an editing function of operating and re-recording an original still image. It is related to the device (hereinafter referred to as VTR).

[Prior Art] FIG. 4 is a diagram showing a configuration of a conventional VTR. Explaining the configuration of this device, in the figure, the conventional VTR is
Magnetic tape 1 for recording information, recording system block 21, head changeover switch 22 for switching magnetic heads 12 and 13 for recording / reproducing information, rotary transformer 23 for electric / magnetic conversion of a given signal, magnetic tape A tape running drive circuit 25 for driving and controlling the operation 1 and a mode selection switch 26 for selecting the operation mode of the VTR are included. The recording system block 21 includes a video signal source 211 that provides a video signal including a luminance signal and a color signal, a luminance signal pass filter 212 that receives the video signal from the video signal source 211 and passes a luminance signal component, and a video signal source. A color signal pass filter 213 that receives a video signal from 211 to pass a color signal component, an FM modulator 214 that receives the luminance signal from the luminance signal pass filter 212 and frequency-modulates it, and a color from the color signal pass filter 213. Low-pass converter 215 that receives signals and converts them to low-frequency
And an adder circuit 216 for receiving and adding signals from the FM modulator 214 and the low frequency converter 215.

The reproduction system block 24 includes head amplifiers 241 and 242 for amplifying signals given via the magnetic head block 11 and the rotary transformer 23, and an adder circuit 243 for receiving signals from the head amplifiers 241 and 242 and sequentially adding them.
And an FM luminance signal pass filter 244 which receives the signal from the adder circuit 243 and passes the frequency-modulated luminance signal component.
And an FM demodulator 245 that receives the FM luminance signal from the FM luminance signal passing filter 244 and demodulates it in an FM fashion, and a low-pass color that receives the reproduced video signal from the adder circuit 243 and passes the low-pass converted color signal component. A signal pass filter 246, a high pass converter 247 for converting the low pass signal from the low pass color signal pass filter 246 to a high frequency band, a signal from the FM demodulator 245 and a high pass converter.
It includes an adder circuit 248 for receiving and adding a signal from 247, and an output terminal 249 for outputting a signal from the adder circuit 248. One of the output terminals 249 is grounded. The mode selection switch 26 includes a recording command switch 261, a reproduction command switch 262,
A stop command switch 263, a high speed reproduction command switch 264 and a pause command switch 265 are included.

Next, the operation of the conventional VTR will be described with reference to FIG.

First, the signal processing in the recording mode will be described.
In the recording mode, the switches 221 and 222 included in the head changeover switch 22 have contact points a shown in FIG.
Has been switched to the side. The video signal generated from the video signal source 211 is a luminance signal with a frequency band up to about 3 MHz, and 3.
It consists of a 58 MHz color signal. The luminance signal passes through the luminance signal pass filter 212 and is given to the FM modulator 214. The FM modulator 214 converts the luminance signal into an FM signal of 3.4 MHz and 4.4 MHz and gives it to the adding circuit 216. On the other hand, the color signal passes through the color signal pass filter 213 and is given to the low-pass converter 215. The low frequency converter 215 converts the color signal into a signal of 629 MHz and supplies it to the adding circuit 216. The adder circuit 216 adds the FM-modulated luminance signal and the low-frequency converted color signal. This addition signal (that is, the frequency-modulated video signal) is given to the magnetic head 13 via the switch 221 included in the head changeover switch 22 and the transformer 231 included in the rotary transformer 23, and also via the switch 222 and the transformer 232. Are applied to the magnetic head 12. The magnetic head 12 records the frequency-multiplexed video signal (consisting of the luminance signal and the chrominance signal) on the corresponding track (referred to as A track) of the magnetic tape 1. 13 is
The frequency-multiplexed video signal is recorded on the corresponding track (referred to as B track) of the magnetic tape 1. Magnetic head
12 and 13 are rotating magnetic heads, which alternately record one track at a time.

Next, the signal processing in the reproduction mode will be described.
In this case, the reproduction command switch 262 is pressed. In response to this, the tape running drive circuit 25 switches each of the switches 221 and 222 included in the head changeover switch 22 to the contact b side shown in the drawing to switch to the reproduction system block 24. In this state, the video signal recorded on the A track of the magnetic tape 1 is reproduced by the corresponding magnetic head 12 and given to the head amplifier 241 via the transformer 231 and the switch 221. The head amplifier 241 amplifies the supplied reproduction signal and supplies it to the adding circuit 243. When the magnetic head 12 finishes reproducing one track, the video signal recorded on the B track of the magnetic tape 1 is reproduced by the magnetic head 13 and transferred to the transformer.
Applied to the head amplifier 242 via 232 and switch 222. The head amplifier 242 amplifies the supplied reproduction signal and supplies it to the adding circuit 243. The adder circuit 243 sequentially adds the reproduced signals from the A track and the B track, and supplies them to the FM luminance signal pass filter 244 and the low-pass color signal pass filter 246. FM luminance signal pass filter 244
Passes the FM luminance signal in the frequency band modulated by the FM modulator 214 and gives it to the FM modulator 245. FM demodulator 245 is FM
The luminance signal is FM demodulated to derive the luminance signal, and the adding circuit 248
Give to. On the other hand, the low-pass color signal pass filter 246 passes the low-pass converted color signal and supplies it to the high-pass converter 247. The high frequency converter 247 converts the low frequency converted color signal to 3.5.
It is converted into an 8 MHz color signal and given to the adding circuit 248. The adder circuit 248 uses the luminance signal from the FM demodulator 245 and the high frequency converter 247.
The color signal from the
Output to 9.

[Problems to be Solved by the Invention] Since the conventional VTR is configured as described above, when editing a still image, there is only a method of providing a special editing machine externally or performing it in real time. It was

The present invention has been made to solve the above problems of the present invention, and can easily realize an editing function of operating an arbitrary still image according to the sense of the editor and re-recording it.
The purpose is to provide.

[Means for Solving Problems] The present invention is a video recording / reproducing apparatus, in which a video signal is recorded on a recording medium, and the recorded video signal is reproduced, and a video signal input from the outside. And switching means for switching the reproduced signal from the recording medium, storage means for storing the switched video signal, and bit-wise logic for the address or data of the storage means at the time of writing to or reading from the storage means. It comprises a logical operation means for performing an operation and a recording selection switching means for recording the data read from the storage means on a recording medium.

[Operation] In the video signal recording / reproducing apparatus according to the present invention, the address or data of the storage means is stored when the video signal input from the outside or the reproduced reproduction signal is stored in or read from the storage means. By performing a bit-wise logical operation with respect to, a special effect can be given according to the sense of the editor, and the signal to which this special effect is given is arbitrarily read from the storage means and recorded in a recording medium.

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

FIG. 1 is a diagram showing the configuration of a VTR which is an embodiment of the present invention. Explaining the structure of this device, in the figure, an input / reproduction changeover switch 71 is a switch which can be changed over depending on the operation mode of the VTR.
By switching to the contact h side during recording, a new video signal 72 is derived from the outside. The recording selection switch 80 is a switch that is switched to the contact e side when the video signal 72 is recorded on the magnetic tape 1, and is similar to the input / reproduction changeover switch 71.
It is switched by the control circuit (not shown) of the VTR. The video signal memory 73 includes a luminance signal memory 90 and a chrominance signal memory 91, and naturally also includes a signal converter (not shown) required depending on the memory format (digital system, analog system, semiconductor memory, magnetic memory, etc.). It is assumed that
The memory control circuit 75 controls the address of the video signal memory 73, and outputs the storage command switch 76 to the video signal memory 73.
When the special effect command signal 81 is input from the VTR control circuit, the address control of the video signal memory 73 and the data conversion are performed. The image is changed by controlling the signal conversion unit by a method different from that in the normal time. input·
The reproduction / storage changeover switch 74 is a signal read out from the reproduction signal on the contact c side or the input video signal 72 and the video signal memory 73 on the contact d side by the screen changeover circuit 77 based on the command from the screen changeover switch 78. Switch between and.

FIG. 2 shows a time chart of writing / reading of the video signal memory 73.

FIG. 3 shows an example of the map configuration of the video signal memory 73, showing the map configuration equivalent to that for the special effect.

Next, the operation of this device will be described. Now, assume that the magnetic tape 1 is loaded in the VTR and is in the reproduction mode. At this time, the input / playback selector switch 71 is switched to the contact g side, the input / playback / memory selector switch 74 is switched to the contact c side, and the recording selection switch 80 is switched to the contact f side. The video of the field) is reproduced and output as an output signal 79 on the monitor. In this state, when the memory command switch 76 is pressed as shown in FIG. 2A, the memory control circuit 75
Writes one field of the reproduced video signal in the video signal memory 73 in synchronization with the vertical synchronizing signal (FIG. 2B) obtained from the reproduced video signal. This situation is shown in Fig. 2 (c), but the video signal memory is at "H" level (representing high potential).
Write period to 73 and "L" level (representing low potential)
Represents the reading period of the memory contents.

The video signal is stored in the video signal memory 73 in a map configuration as shown in FIG. 3 (a), for example. Where α,
β represents the number of pixels in the vertical and horizontal directions of the screen,
For example, 256 × 256. γ is the number of bits obtained by converting the analog value of one pixel into a digital value, and is set to 8, for example.

In this way, the contents stored in the video signal memory 73 are monitored by the screen changeover switch 78 when the input / playback / memory changeover switch 74 is switched to the contact point d side by the screen changeover circuit 77 to produce the output signal 79. You can check it on the screen. The operation of the screen changeover switch 78 at this time is shown in FIG. The output of the screen switching circuit 77 is shown in FIG. 2 (E), and the input / playback / memory switching switch 74 is switched to the contact d side at the "H" level. Both are synchronized with the vertical synchronizing signal shown in FIG.

Although the example of the still image editing operation at the time of reproduction has been described above, one field can be similarly stored in the video signal memory 73 even when a new video signal 72 is externally supplied. Only 71 is switched to the contact point h side, and the others can edit the still image with the same operation as during reproduction.

When the contents written in the video signal memory 73 are read out in the above manner, when the address control and the data signal conversion unit control which are the same as in the normal writing are performed, the number of pixels is 256 × 256. Although an image having a gradation of 8 bits can be reproduced, when the special effect command signal 81 is input to the memory control circuit 75, the control of the data signal converter is changed equivalently, for example, FIG. 3 (b). By changing the gradation of the pixel to a powerful screen with 4 bits dropped, or by changing the address control, as shown in Fig. 3, equivalently, for example, a mosaic screen of 64 x 64 pixels is displayed as shown in Fig. 3 (c). Can be changed.

In this way, an image obtained by changing the original image by the special effect can be recorded on the magnetic tape 1 by switching the recording selection switch 80 to the contact e side at the same time when the recording operation is started in the recording mode.

According to the above, an editing function of operating a still image of one field from a reproduction signal or a new video signal according to the sense of the editor and recording the video again on the magnetic tape 1 becomes possible. Become.

Although the video signal memory 73 is a field memory in the above embodiment, it may be a frame memory.

Further, in the above-described embodiment, the video signal memory 73 is divided into the luminance signal memory 90 and the color signal memory 91, but the same effect as in the above-described embodiment can be obtained even if the video signal memory 73 is directly processed as a composite video signal.

In the above embodiment, the case where a mosaic screen is created by dropping pixels as a special effect and the case where a powerful screen is created by reducing the number of bits of digital data per pixel are shown. However, the screen is enlarged. Alternatively, reduction can be easily realized by changing address control.

[Effects of the Invention] As described above, according to the present invention, when a video signal input from outside and a reproduced reproduction signal are switched and the video signal or the reproduction signal is stored in the storage means, or from the storage means. At the time of reading, the address of the storage means or the bitwise logical operation is performed on the data and the result is recorded in the recording medium, so that an editing key is not required.
An arbitrary still image can be given a special effect according to the sense of the editor, and an editing function of re-recording an arbitrary still image can be easily realized.

[Brief description of drawings]

FIG. 1 is a diagram showing the configuration of a VTR which is an embodiment of the present invention. FIG. 2 is a time chart explaining the operation of the VTR according to the embodiment of the present invention. FIG. 3 is a diagram showing a memory map configuration of the VTR according to the embodiment of the present invention. FIG. 4 is a diagram showing a configuration of a conventional VTR. In the figure, 1 is a magnetic tape, 12 and 13 are magnetic heads, 21 is a recording system block, 22 is a head changeover switch, 23 is a rotary transformer, 24 is a reproduction system block, 25 is a tape running drive circuit, and 26 is a mode selection switch. , 71 is an input / playback selector switch, 73 is a video signal memory, 74 is an input / playback / memory selector switch, 75 is a memory control circuit, 76 is a memory command switch, 77 is a screen selector circuit, 78 is a screen selector switch, 80 Is a recording selection switch, 90 is a luminance signal memory, 91 is a color signal memory, and 100 is a magnetic head. In the drawings, the same reference numerals indicate the same or corresponding parts.

Claims (3)

[Claims] 1. A video recording / reproducing means for recording a video signal on a recording medium and reproducing the recorded video signal, and a switching means for switching between a video signal input from the outside and a reproduction signal from the recording medium. Storage means for storing the video signal switched by the switching means, and logical operation means for performing a bit-by-bit logical operation on the address or data of the storage means when writing or reading to or from the storage means, A video recording / reproducing apparatus, comprising: a recording selection switching unit that records the data read from the storage unit onto the recording medium. 2. The video according to claim 1, wherein the logical operation means performs a logical operation of fixing the lower b bits of the a-bit data of the storage means to data "1" or "0". Recording / playback device. 3. The video recording / reproducing according to claim 1, wherein the logical operation means performs a logical operation of fixing the lower d bits of the c-bit address of the storage means to "1" or "0". apparatus.