JPS6318783A - Video signal recording and reproducing device - Google Patents

Abstract

PURPOSE:To correctly carry out the video signal processing of a muse decoder even when a special reproduction such as a high speed reproduction, a reverse high speed reproduction is carried out and to reproduce a high definition tele vision signal of high picture quality by recording a muse control signal by a fixed head. CONSTITUTION:The muse signal inputted from a terminal 51 is separated into the control signal and the video signal in a switching circuit controlled by a switching synthesis control circuit 66. This control signal is recorded on a tape 55 by the fixed head 54 and one video signal is recorded on the tape 55 by rotating heads 58, 59. At the time of the reproduction, the control signal reproduced from the fixed head 54 is demodulated in a reproduction control processing circuit 61, a time base is corrected, and it is inputted to a synthesis circuit 67 controlled by the switching synthesis control circuit 66. The signal reproduced form the rotating heads 58, 59 is demodulated in a reproduced video signal processing circuit 62, synthesized with the reproduced control signal in the synthesis circuit 67 and a reproduced muse signal is outputted from a terminal 63.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to a video signal recording and reproducing device such as a video recorder (hereinafter abbreviated as VTR) that records and reproduces high-definition television broadcasting. Regarding.

(Prior art) In television broadcasting, the vertical blanking period of the image signal is used to multiplex digitized control signals to control the image information, thereby thinning out the image signal and compressing the band of the transmission signal. A method has been proposed. The Japan Broadcasting Corporation is promoting ``-x'' (MUsg
) system is one example, and this muse signal has a multi-signal configuration as shown in FIG. That is, the color signal portion C1°, the luminance signal portion Y2. Control signal section 3.
Clamp level section 4. Block control (frame pulse line 6, horizontal synchronization signal section 7, etc.).

The control signal section 3 is composed of 32 pit signals, the contents of which are shown in FIG.

The horizontal motion vector 10° and the vertical motion vector 11 included using control signals A1 to A8 are used for motion compensation in the Muse method, and in the case of panning, the entire screen becomes a motion area. This prevents it from being put away.

FIGS. 5(a) to 5(d) show the motion correction function. 21 in FIG. 5(a) is the screen of the previous frame, 22 in FIG. 5(b)
indicates the screen of the current frame, and 21 and 22 indicate the screen when panning diagonally downward. Reference numeral 23 in FIG. 5(C) indicates a portion that becomes a moving area when no motion correction is performed, resulting in a full-screen moving area. However, if you shift the previous frame by the amount that the screen moves and read it from memory, the contents of the past sampling point and the current sampling point will overlap even when panning, so the edge of 24 in Figure 5(d) will overlap. Part 2
Images other than 5 can be processed as still images.

However, when the muse signal is recorded on a VTR using a rotary head, control signals 40-49 of the muse signal are recorded on some of the video tracks 30-39, as shown in FIG. With such a configuration, a normal image can be reproduced during normal reproduction, but a control signal that is not reproduced occurs during high-speed reproduction and reverse high-speed reproduction. Therefore, a control signal that does not match the reproduced image is transmitted to the muse decoder, making it impossible to perform correct video signal processing.

(Problems to be Solved by the Invention) The present invention has been developed in view of the fact that in the conventional technology, a part of the control signal is not reproduced during high-speed playback or reverse high-speed playback, so the video signal processing of the Muse decoder is not performed correctly. Since all the Muse control signals are reproduced and used, the Muse decoder performs normal video signal processing and reproduces high-definition television signals with high picture quality. The purpose is to provide equipment.

[Configuration of the Invention (Means for Solving Problems)] In order to achieve the above object, the present invention vertically blocks a sub-sampled video signal obtained by subsampling a video signal and a control signal according to the image content of the video signal. A video signal recording and reproducing device that records and reproduces the band pressure a signal inserted during the ranking period includes a circuit that separates a control signal from the band compression signal at the time of recording, and a predetermined process that is applied to the control signal separated by this circuit. A device for recording with a fixed head, a device for recording the sub-sampled video signal with a rotating head, and a control signal played from the fixed head inserted into the sub-sampled video signal played from the rotating head during playback. It is equipped with a means for reproducing a band compression signal, and in particular, in order to perform special reproduction such as double speed, high speed, and reverse, the Dunn correction vector in the control signal is used to reproduce the previous reproduction reproduced from the fixed head. The panning correction vector obtained by adding 1 to the field that has been reproduced is replaced with the vector sum of the panning correction vector of the currently reproduced field.

(Function) With the above means, by recording the control signal with a fixed head, all the control signals can be reproduced even during special reproduction such as double speed, high speed, and reverse playback of a VTR. (9) During special playback, by vector-adding a motion vector for motion correction and inserting it into the control signal, motion correction can be performed that matches the content of the video.

(Example) Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 shows an embodiment of the present invention, in which a mix signal inputted through a terminal 51 is sent to a switching circuit 65 controlled by a switching synthesis control circuit 66 to receive a control signal (the control signal shown in FIG. 3). section 3) and video signal (color signal section 1 in Fig. 3)
．． Freshness signal section 2. Clamp level section 4. Block control M 4fjtf55, frame pulse line 6,
The signal is separated into a horizontal synchronization signal section 7). The separated control signal is subjected to predetermined processing such as time axis processing, FM modulation, and bias addition in a recording control signal processing circuit 52, passes through a switch 53 connected to the recording side R, and is sent to a fixed head 54. It is recorded on tape 55. On the other hand, the separated video signal is subjected to F'M modulation in the signal processing circuit 56, passes through the screen 5 connected to the recording side I, and is transferred to the tape 55 by a one-rotation head 58°59. The switches 53 and 57 are switched by the logic circuit 60 in accordance with the VTR mode (record, playback, high-speed playback, etc.) input from the terminal 64.

At the time of reproduction, the control signal reproduced by the fixed helad 54 is demodulated by the reproduction (through the switch 53 connected to !IIP, the reproduction control processing circuit 6), the time axis is also corrected, and the control signal is demodulated by the switching synthesis control circuit. The signal is input to a synthesis circuit 67 controlled by 66.

Further, the signals reproduced from the rotary heads 58 and 59 are passed through the switch 52 connected to the reproduction side P, demodulated by the reproduction video signal processing circuit 62, and combined with the reproduction control signal by the 1 synthesis circuit 67. A stop muse signal is output from the terminal 63.

FIG. 2 shows a track pattern when this invention is used. The tape 91 includes a muse control signal track 90 on which muse signal control signals 81 to 89 are recorded by the fixed head 54 and video signal tracks 71 to 89.
Consists of 80.

With the above-described configuration, all control signals can be reproduced even when performing special reproduction such as high-speed reproduction, reverse reproduction, and high-speed reverse reproduction.

In addition, all the zero correction motion vectors in the control signal can be reproduced. When playing a VTR at high speed,
The content of the reproduced Muse video signal moves only by a certain amount, so in this VTR, by inserting the panning correction vector into the panning correction vector using equation (1), the Muse decoder can process still images.

[Effects of the Invention] As described above, according to the present invention, by recording the muse control signal with a fixed head, high-speed playback and
Even when performing special playback such as reverse high-speed playback, all control signals of the Muse signal are regenerated, the playback control signal is reconfigured from the contents of all control signals, and the video signal processing of the Muse decoder is performed using the correct control signal. can be done correctly. Therefore, even during special playback, normal motion correction is performed in the muse decoder, making it possible to reproduce high-definition television signals with high image quality.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing one embodiment of the present invention. Fig. 2 is an explanatory diagram showing an example of a track pattern of a VTR according to the present invention, Fig. 3 is a configuration diagram showing an example of a muse signal using the muse method, and Fig. 4 shows an example of the content of a control signal of the muse signal. FIG. 5 is an explanatory diagram showing an example of motion correction in the MUSE system, and FIG. 6 is an explanatory diagram showing a track pattern of a conventional VTR. 52... Recording control signal processing circuit, 54...
Fixed head, 55... Tape, 56... Recorded video signal processing circuit, 58. 59... Rotating head, 60...
logic circuit, 61... playback control signal processing circuit, 62... playback video signal processing circuit, 65... switching circuit, 66... switching synthesis control circuit, 67... synthesis circuit. Applicant's agent Patent attorney Takehiko Suzue No. 4aII l'O Figure 5

Claims (2)

[Claims] (1) In a video signal recording and reproducing device that records and reproduces a sub-sampled video signal obtained by subsampling the video signal and a band compression signal in which a control signal according to the image content of the video signal is inserted during the vertical blanking period, at the time of recording, a circuit that separates a control signal from the band compression signal;
A device that performs predetermined processing on the control signal separated by this circuit and records it with a fixed head, a device that records the sub-sampled video signal with a rotating head, and a device that records the sub-sampled video signal with a rotating head during playback. 1. A video signal recording and reproducing device comprising means for inserting a control signal reproduced from a fixed head and reproducing a reproduction band compressed signal. (2) When performing special playback such as double speed, high speed, and reverse, the pan correction vector in the control signal is changed from the pan correction vector obtained by adding 1 to the previously played field played from the fixed head to the currently played field. 2. The video signal recording and reproducing apparatus according to claim 1, wherein the video signal recording and reproducing apparatus is replaced with a vector sum of panning correction vectors.