JP3060764U - Video deck - Google Patents

Abstract

(57) [Summary] [PROBLEM] To reproduce a video by switching between a still image and a moving image when reproducing a slow motion video, so that the reproduced video is shifted up and down due to a difference in relative speed or an error of a pseudo sync signal. There has been a problem that small right and left swaying occurs. SOLUTION: When a rotating motion / stop is repeatedly performed by a video head 11 and a slow motion video is reproduced by connecting still images at the time of stop, instead of using a still image of a stopped portion, the video is not used. By using the immediately preceding still image, it is possible to prevent the screen from swaying up, down, left, and right when the slow motion video is reproduced. Further, by shifting the timing of video output of a moving image by the hold circuit 42, it becomes possible to replace an image containing a noise component with a still image containing no noise component stored in the field memory 43.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a video deck, and more particularly, to a video deck that executes slow-motion video playback.

[0002]

[Prior art]

 Conventionally, as this kind of video deck, one disclosed in Japanese Utility Model Laid-Open No. 3-12582 is known. The video deck disclosed in the publication is a helical scan video tape recorder, in which a predetermined drive mechanism intermittently drives a video tape intermittently one frame at a time, and synchronizes with the video tape feed. The video playback signal recorded on the video tape is intermittently written to the field memory as an image. Then, a slow-motion video is reproduced by alternately reading out a video reproduction signal of an image and a video reproduction signal of a normal moving image written in the field memory at predetermined intervals. In such a case, a predetermined memory control means stores a video reproduction signal of one field and a video reproduction signal of one field next to the running stop period in the field memory at substantially equal intervals during the running period of the video tape based on the intermittent driving. Writing is in progress.

[0003]

[Problems to be solved by the invention]

 The conventional video deck described above has the following problems. In other words, when playing back a slow-motion video, the video is alternately played back by switching between a still image and a moving image, and fine vertical and horizontal fluctuations occur in the reproduced video due to differences in relative speed and errors in the pseudo sync signal. There was a problem that would be.

The present invention has been made in view of the above-described problems, and provides a video deck capable of preventing fine vertical, horizontal, and horizontal fluctuations occurring in a slow-motion image by continuously reproducing still images. With the goal.

[0005]

[Means for Solving the Problems]

 In order to achieve the above object, the invention according to claim 1 comprises a video reproduction signal obtaining means for obtaining a video reproduction signal recorded on a video tape while rotating the inserted video tape, A digital signal converting means for inputting a video reproduction signal for reproducing the moving picture image acquired by the signal acquiring means and for converting the moving picture into a digital signal, and for intermittently stopping the rotation driving of the video tape, thereby slowing down the moving picture. An image digital signal storage means for storing a digital signal constituting an image of a field being driven in rotation before a field in which the rotation drive of the video tape is stopped when converting to a motion image; The digital signal that constitutes the image stored in the signal storage means is converted to an analog signal and output, and the Shon is configured so as to ingredients Bei a slow-motion image reproduction means for reproducing video.

[0006] In the invention according to claim 1, the video reproduction signal recorded on the video tape is read out by rotating the video head in the video reproduction signal acquisition means, and the digital signal conversion means is provided. Inputs a video reproduction signal for reproducing this moving image and converts it into a digital signal. Subsequently, the image digital signal storage means intermittently stops the rotation of the video tape by the video reproduction signal acquisition means, and stops the rotation of the video tape when converting the moving image into a slow motion image. Stores the digital signals that make up the image of the field that is being driven in rotation before. Here, the field is a unit for forming one screen of video. The slow-motion video playback means converts the digital signal constituting the image stored in the image digital signal storage means into an analog signal at a predetermined interval, outputs the analog signal as a video signal, and plays back the slow-motion video. I have. That is, when outputting a slow-motion video, a digital signal of a still image, which is an image of a field being rotationally driven before the field where the rotational drive is stopped, is output as a video signal at a predetermined interval, thereby obtaining a still image. Plays a slow-motion video by continuous output of.

Here, it is preferable that an interval for outputting an analog signal can be set by the slow-motion image reproducing means in order to change the slow time interval of the slow-motion image. Thus, a second aspect of the present invention is the video deck according to the first aspect, wherein the slow-motion video playback means includes an output interval setting means for setting a predetermined interval for outputting a digital signal. In the invention according to claim 2 configured as described above, the output interval setting means sets a predetermined interval at which the slow motion video reproducing means outputs the digital signal.

[0008] Further, according to a third aspect of the present invention, in the video deck according to any one of the first and second aspects, the slow-motion video reproduction means includes a digital video signal stored in the image digital signal storage means. A digital signal extracting means for extracting a predetermined signal component from the signal, converting the digital signal from which the predetermined signal component is extracted by the digital signal extracting means into an analog signal, and outputting the analog signal at a predetermined interval; There is a configuration to do. In the invention according to claim 3 configured as described above, the digital signal extracting means extracts a predetermined signal component from the digital signal stored in the image digital signal storing means. Then, the digital signal from which the predetermined signal component has been extracted by the digital signal extraction means is converted into an analog signal and output at predetermined intervals.

According to a fourth aspect of the present invention, in the video deck according to any one of the first to third aspects, the slow-motion video reproducing means sets a signal component of the digital signal to be extracted. The configuration includes an extraction condition setting unit. In the invention according to claim 4 configured as described above, the extraction condition setting means sets the signal component of the digital signal to be extracted.

According to a fifth aspect of the present invention, in the video deck according to any one of the first to fourth aspects, the slow-motion video playback means includes a digital video signal stored in the image digital signal storage means. It is provided with a difference calculating means for calculating a difference of the signals in chronological order, and is configured to perform predetermined signal processing on a digital signal output based on the difference. In the invention according to claim 5 configured as described above, the difference calculation means sequentially acquires the digital signals stored in the image digital signal storage means, and calculates the difference of the acquired digital signals in chronological order. . Then, predetermined signal processing is performed on the digital signal output based on this difference. The predetermined signal processing may be such that signal processing is performed so as to emphasize a place where the value of the difference is large, or signal processing may be performed so as to emphasize a place where the value of the difference is small.

[0011] As described above, in order to stabilize a slow-motion image formed by continuously outputting a predetermined image, that is, a still image obtained during rotation driving of a video head, the above-described means are implemented. ing. On the other hand, even when a video playback signal is normally played back, noise components may enter the field of the playback video and become unstable due to tracking deviation of the video head and the like. In such a case, as a preferable method for removing the unstable field, the invention according to claim 6 is a method in which the inserted video tape is recorded while rotating the inserted video tape. A video reproduction signal obtaining means for obtaining a video reproduction signal; a digital signal conversion means for inputting a video reproduction signal for reproducing a moving image obtained by the video reproduction signal obtaining means and converting the video reproduction signal into a digital signal; An image digital signal storage unit for storing a digital signal constituting an image in a field unit while obtaining a digital signal converted by the signal conversion unit; and a noise component detection unit for detecting a noise component of the video reproduction signal. While performing predetermined signal processing on the video reproduction signal, a video signal for forming a moving image is output. When noise is detected by the noise detection means, a digital signal of an image constituting a field immediately before the field in which the noise is detected is obtained from the image digital signal storage means, and the digital signal is converted into an analog signal. And a video reproducing means for outputting a video signal.

[0012] In the invention according to claim 6, the video reproduction signal recorded on the video tape is read by the rotation of the video head in the video reproduction signal acquisition means, and the moving image is reproduced. The digital signal converting means converts the reproduced video signal into a digital signal while inputting the video signal. Subsequently, the image digital signal storage means sequentially stores the video reproduction signals converted into digital signals by the digital signal conversion means as images in field units. Then, the video reproducing unit outputs a video signal while performing predetermined signal processing on the video reproduction signal described above. Here, if noise is generated in the reproduced video reproduction signal due to a deviation in tracking of the video head or the like, the noise is detected by the noise component detection means, and the video reproduction means is supplied to the video component by the noise component detection means. When noise in the reproduced signal is detected, the image of the field immediately before the field formed by the video reproduced signal is obtained from the image digital storage means and replaced with the field containing the noise. In other words, when noise occurs in the video reproduction signal due to a deviation in tracking of the video head, the user replaces the video reproduction signal that forms the screen of the field where the noise has occurred with the immediately preceding image, thereby causing the user to enter the noise. You don't have to watch the video

[0013]

[Effect of the invention]

 As described above, the present invention provides a video deck capable of preventing fine vertical, horizontal, and vertical shaking that occurs in a reproduced video by continuously reproducing an image acquired during rotation of the video head. It can provide a video deck that can be used. Further, according to the invention of claim 2, it is possible to appropriately change the image output interval when a slow motion video is reproduced. Further, according to the invention of claim 3, since a predetermined signal component is extracted, and the extracted signal component is used as a video signal to reproduce a slow motion video, an effective video can be obtained.

Further, according to the present invention, it is possible to appropriately change the signal components to be extracted. Further, according to the present invention, when a slow-motion image is reproduced by an image acquired during rotation driving of the video head, a predetermined image is generated according to the difference between the previously output image and the currently output image. By performing the above-described processing, it is possible to easily perform predetermined signal processing such as emphasizing a portion having large fluctuation. Further, according to the invention of claim 6, when a noise component is detected in the video reproduction signal, the video component is replaced with a video that does not include the noise component, so that the video deck that can remove the video with the noise component can be removed. Can be provided.

[0015]

[Embodiment of the invention]

 Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a claim correspondence diagram of a video deck according to an embodiment of the present invention. In the figure, a video reproduction signal recorded on a video tape is read by rotation of a video head in a video reproduction signal acquisition means C1, and a digital signal conversion means C2 inputs the video reproduction signal and converts the video reproduction signal into a digital signal. Convert . Subsequently, the image digital signal storage means C3 controls the video reproduction signal acquisition means C1 to intermittently rotate and stop the rotation of the video tape, and to generate a slow motion video of a moving image while generating a video slow motion video. A stop notification is input from the video reproduction signal acquisition means C1 before the field where the rotation drive stops, and the digital signal forming the image of the field being driven for rotation before the stop is stored. Then, the slow-motion video reproducing means C4 converts the digital signal constituting the image stored in the image digital signal storing means C3 into an analog signal at a predetermined interval, and outputs the analog signal as a video signal to reproduce the slow-motion video. doing.

Next, FIG. 2 shows a schematic block diagram of a reproduction system circuit for reproducing a video signal recorded on a video tape in the video deck, which is connected to a television for displaying reproduced video and the like. In the figure, in a video deck 10, a signal reproduced by a video head 11 is amplified and high-frequency compensated by a head amplifier 12, only an FM signal is extracted by a high-pass filter 13, and an original luminance signal is extracted by an FM demodulation circuit 14. Demodulate. The low-pass filter 15 extracts only the low-frequency-converted carrier color signal, and the frequency demodulation circuit 16 returns the carrier color signal to a 3.58 MHz carrier color signal. Here, the FM demodulation circuit 14 and the frequency demodulation circuit 16 constitute a demodulation circuit 40 integrally. The luminance signal and the carrier color signal demodulated by the FM demodulation circuit 14 and the frequency demodulation circuit 16 are output to the S video output terminal 17 and input to the S video input terminal 33.

The demodulated luminance signal and carrier chrominance signal are mixed by a YC mixing circuit 18 to form a composite video signal. The composite video signal is output to the video output terminal 19 and to the video input terminal 32. Further, the signal is converted into VHF 1ch or 2ch in the RF converter circuit 20 and output from the U / V output terminal 21 to the U / V antenna terminal 31. Therefore, the S video signal, the composite video signal, and the RF 1ch or 2ch signal demodulated by the video deck 10 are supplied to the television 30. By switching, it is possible to select whether to display an image based on any of the signals.

The video reproduction signal obtained by the video head 11 can be viewed on the television 30. Here, the video reproduction signal is usually read out in units of video tracks recorded on a video tape while the video head 11 and the like are driven at a predetermined speed. When the video playback signal is played back in slow motion, the slow motion function is selected and executed. This slow-motion function forms a slow-motion image by repeatedly rotating and stopping the video head 11 at predetermined intervals, acquiring a still image when the video head 11 is stopped, and sequentially outputting the still image. I do. However, if a still image is acquired when the rotation of the video head 11 stops, the deceleration time until the video head 11 stops and the pseudo-synchronous speed are different every time the still image is acquired. If video is output sequentially, fine vertical and horizontal fluctuations will occur in the connection between still images.

Here, a block diagram of a demodulation circuit 40 capable of correcting fine vertical, horizontal, and vertical fluctuations generated in a slow motion image by connecting the above-described still images at the position where the video head 11 stops is shown in FIG. 3 is shown. The demodulation circuit 40 receives the signals output from the high-pass filter 13 and the low-pass filter 15 through an analog / digital conversion circuit 41 and converts the input analog signals into digital signals. In the input signal, a digital signal in units of fields constituting one screen of a video output from the television 50 is output to the hold circuit 42 and the field memory 43. When a normal moving image is reproduced, a digital signal in a field unit is held for a predetermined period in a hold circuit 42 and output to a digital / analog circuit 46 via a switching circuit 45. At 50, the reproduced video can be viewed. Here, the reason for passing through the hold circuit 42 is to execute a removal process for removing a field including a noise component described later.

When reproducing a slow motion video, the slow motion reproduction circuit 44 sequentially reads out digital signals constituting a still image stored in the field memory 43 and outputs the digital signal via a switching circuit 45 to a digital / analog circuit. A video is output to 46, and the slow motion video can be viewed on the television 50 by the output analog signal. The switching circuit 46 switches the connection between the hold circuit 42 that outputs a video signal of a moving image according to the presence or absence of a slow motion selection signal input from the system controller 50 and the slow motion reproduction circuit 44 that outputs a video signal of a slow motion video. ing.

When the slow motion function is selected, the video head 11 repeatedly rotates and stops to acquire a still image forming a slow motion video. A stop signal for stopping the rotation is output from the system controller 50 to the video head 11. When outputting the stop signal, the system controller 50 outputs a stop notification signal to the field memory 43 at the timing when the field immediately before the field to be stopped is input to the demodulation circuit 40. The field memory 43 which has received the stop notification signal stores a digital signal in units of fields. That is, a digital signal constituting a still image immediately before the video head 11 stops is acquired and stored. The acquisition of the still image based on the stop notification signal is executed while the slow motion function is selected.

FIG. 4 shows how a digital signal in a field unit is obtained by the stop notification signal. In the figure, field images (1) to (6) form a moving image by sequentially outputting (1) to (6). When the video head 11 stops at the field images (2) and (5) in the case where a slow motion image is formed, the stop notification signal is demodulated by the field images (1) and (4). The signal is output from the system controller 50 at the timing input to the circuit 40. Then, as shown in FIG. 5, the field memory 43 acquires the field images (1) and (4) and stores them as still images. The field video, that is, the still image, which is sequentially stored in the field memory 43 as described above, is read out at a predetermined interval by the slow-motion reproducing circuit 44, and is output via the switching circuit 45 and the digital / analog circuit 46, so that the television At 50, the slow motion video can be viewed.

In the present embodiment, when the slow motion function is selected, a digital signal constituting a still image in a field unit stored in the field memory 43 is output as an image at a predetermined interval, so that the slow motion is performed. Although the motion video is configured to be reproduced, the method of obtaining and using a still image at a predetermined timing as described above is not limited, and the noise component of the video reproduction signal input to the demodulation circuit 40 is converted into a system component. It is also possible to adopt a configuration in which the video containing the noise component is detected at 50 and replaced with a still image immediately before the noise component is included.

In such a case, the field memory 43 always stores still images of several fields, and the system controller 50 that has detected the noise component of the video reproduction signal notifies the field memory 43 of the noise detection. Upon receiving this notification, the field memory 43 outputs a still image immediately before the still image including the noise component to the hold circuit 42, and the hold circuit 42 outputs the still image including the noise component and the field memory 43 is replaced with the still image output from the CPU. As a result, the video signal output from the hold circuit 42 can always contain no noise component.

As described above, when the video head 11 repeatedly performs the rotation operation and the stop, and connects the still images at the time of the stop to reproduce the slow-motion video, the use of the still image of the stopped portion is Instead, by using the immediately preceding still image, it is possible to prevent the screen from swaying up, down, left, and right when playing the slow motion video. Further, by shifting the timing of outputting the video of the moving image by the hold circuit 42, it is possible to replace the image containing the noise component with the still image containing no noise component stored in the field memory 43.

[Brief description of the drawings]

FIG. 1 is a diagram corresponding to a claim of a video deck according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a connection form of a television connected to the video deck.

FIG. 3 is a block diagram of a demodulation circuit of the video deck.

FIG. 4 is a diagram showing still images in field units input to a field memory.

FIG. 5 is a diagram showing a still image forming a slow motion video.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 ... Video head 13 ... High pass filter 14 ... Low pass filter 40 ... Demodulation circuit 41 ... Analog / digital conversion circuit 42 ... Hold circuit 43 ... Field memory 44 ... Slow motion reproduction circuit 45 ... Switching circuit 46 ... Digital / analog conversion circuit 50 ... Syscon

Claims (6)

[Utility model registration claims] 1. A video playback signal acquisition unit for acquiring a video playback signal recorded on a video tape while rotating the inserted video tape, and playing back a video image acquired by the video playback signal acquisition unit. A digital signal conversion means for inputting a video reproduction signal and converting it to a digital signal, while intermittently stopping the rotation drive of the video tape,
An image digital signal storage means for storing a digital signal constituting an image of a field being driven in rotation before a field in which rotation drive of a video tape is stopped when a moving image is made into a slow motion video; and A video deck comprising: a slow-motion video playback unit that converts and outputs a digital signal constituting an image stored in a digital signal storage unit to an analog signal and plays back a slow-motion video. 2. The video deck according to claim 1, wherein said slow-motion video playback means includes output interval setting means for setting a predetermined interval for outputting an analog signal. 3. The video deck according to claim 1, wherein said slow-motion video playback means converts a predetermined signal component from a digital signal stored in said image digital signal storage means. A video deck comprising a digital signal extracting means for extracting, converting a digital signal from which a predetermined signal component is extracted by the digital signal extracting means into an analog signal, and outputting the analog signal at a predetermined interval. 4. The video deck according to claim 1, wherein said slow-motion video playback means includes extraction condition setting means for setting a signal component of said digital signal to be extracted. VCR featuring. 5. The video deck according to claim 1, wherein said slow-motion video playback means calculates a difference in a time series with respect to a digital signal stored in said image digital signal storage means. A video deck comprising a difference calculating means for calculating, and performing predetermined signal processing on a digital signal output based on the difference. 6. A video reproduction signal obtaining means for obtaining a video reproduction signal recorded on a video tape while rotating the inserted video tape, and a video for reproducing a moving image obtained by the video reproduction signal obtaining means. Digital signal conversion means for inputting a reproduction signal and converting the digital signal into a digital signal; an image digital signal for storing a digital signal constituting an image in a field unit while obtaining the digital signal converted by the digital signal conversion means Storage means, a noise component detecting means for detecting a noise component of the video reproduction signal, and a video signal for forming a moving image while performing predetermined signal processing on the video reproduction signal; When noise is detected in the field, the image that constitutes the field immediately before the field where the noise was detected VCR, characterized in that the digital signal to acquire from the digital image signal storing means comprises a video reproduction means for outputting the video signal while converting the same digital signal into an analog signal.