JPS6376585A - Video signal recording and reproducing device - Google Patents

Abstract

PURPOSE:To prevent the deterioration of resolution and the degrading of the quality of a reproduced picture at the time of panning by providing a memory means to store control signals, time-base multiplexing the control signals in one-field share of band compressed signals at the time of recording, then recording the signals. CONSTITUTION:The control signal memory circuit 103 extracts the control signals of respective fields from the input signals and stores them. To a time base multiplex re-forming circuit 104, in addition to a MUSE signal, plural-field share of control signals are supplied from the control signal memory circuit 103 in the respective fields of the MUSE signal. The time-base multiplex re- forming circuit 104 time base multiplexes both of the said input signals, and generates a MUSE signal in one field of which is the plural-field share of control signals inserted. Accordingly, the plural-field share of control signals can be reproduced in one time scanning, therefore, the control signals of all the fields can be reproduced even at the time of special reproducing. As a result, a reproduced picture without deterioration of resolution at the time of panning can be obtained.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Field of Application) The present invention provides a video tape recorder (hereinafter referred to as VTR) suitable for, for example, a video tape recorder (hereinafter referred to as VTR) that performs special reproduction of a MUSE system video signal. The present invention relates to a signal recording and reproducing device.

In television broadcasting, a digitized control signal is multiplexed during the vertical blanking period of the image signal, and the image information is controlled to thin out the image signal, thereby thinning out the transmission signal and compressing its band. A method has been proposed. An example of this is the MUSE system promoted by the Japan Broadcasting Corporation, which has a multiplexed signal configuration as shown in FIG. That is, this MUSE method video signal (hereinafter referred to as MtJSE signal) is transmitted to the color signal section 1,
It has a luminance signal section 2, a control signal section 13, a clamp level section 14, a block control signal section 15, a frame pulse line 16, a horizontal synchronization signal section 17, and an audio/additional information section 18.

The control signal section 13 is composed of a 32-bit signal, the contents of which are as shown in FIG. Horizontal motion vector 10 included in this control signal section 13,
The vertical motion vector 11 is used for motion correction in the MUSE method. The performance of motion compensation is shown in FIG. Reference numeral 21 indicates the screen of the previous frame, 22 indicates the screen of the current frame, and 21 indicates the screen of the poem panned diagonally downward. n indicates a portion that becomes a moving area when no motion correction is performed, resulting in a full-screen moving area.

On the other hand, 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 contents of the screen 14 other than the edge 25 will be Can be processed as a still image.

By the way, the above-mentioned MUSE signal can also be recorded and reproduced on a VTR. When MtJSE signals are recorded on a magnetic tape by a rotating head, as shown in FIG.
A control signal of the MUSE signal is recorded in 9.

However, when recording and reproducing ~IIJSE signals on a VTR, during special playback, as shown in FIG. 6, control signals 47, 49. ... will occur. As a result, it becomes impossible to construct a motion vector that matches the movement of the reproduced image, and the resolution of the reproduced image deteriorates during panning. Furthermore, it becomes impossible to reproduce all the subsample phases, and it becomes impossible to define a subsample phase that matches the reproduced image, making it impossible to obtain a high-quality reproduced image.

(Problems to be Solved by the Invention) As mentioned above, in conventional VTRs, when performing special reproduction of MUSE signals, there is a problem of deterioration of the resolution during panning and deterioration of the quality of the reproduced image due to errors in the sub-sampling phase. Ta.

Therefore, an object of the present invention is to provide a video signal recording and reproducing device that can prevent resolution deterioration during panning and quality deterioration of reproduced images by making it possible to reproduce all control signals during special reproduction. .

[Structure of the Invention] (Means for Solving the Problems) In order to achieve the above object, the present invention provides storage means for control signals so that one field's worth of band compression signal can be stored in a plurality of fields' worth of a band compressed signal at the time of recording. Control signals are time-axis multiplexed and recorded.

(Function) According to the above configuration, since control signals for a plurality of fields can be reproduced in one scan, control signals for all fields can be reproduced even during special reproduction. As a result, motion compensation and subsample phase settings can be performed correctly, and it is possible to obtain a reproduced image without deterioration of resolution even during banning, and to obtain a high-quality reproduced image without errors in the subsample phase. can. Further, there is no need to use a special head such as a fixed head for recording control signals.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a circuit diagram showing the configuration of an embodiment of the present invention.

The high-definition television signal input from the terminal 100 is
The encoder 101 converts it into a MUSE signal, and the terminal 10
given to 2. This MLISE signal is applied to a control signal storage circuit 103, a time axis multiplexing reorganization circuit 104, and an audio signal processing circuit 105. The control signal storage circuit 103 extracts the control signal of each field from the input signal and stores it. Time axis multiplex reorganization circuit 1
04, in addition to the MUSE signal, the control signal storage circuit 103 is stored for each field of this signal.
Control signals for multiple fields are given from the field. A time axis multiplexing circuit 104 time axis multiplexes both human input signals and obtains a MUSE signal in which control signals for a plurality of fields are inserted per field. The MUSE signal obtained by reorganizing the control signals is subjected to FM modulation in the recording signal processing circuit 106. The audio signal processing circuit 105 extracts an audio signal from the input MUSE signal and converts it into a signal suitable for recording. This signal and the output signal of the recording signal processing circuit 106 are combined into an adding circuit 101.
After addition, the rotary head 1 is added via switch 107.
09.110 and recorded on the magnetic tape 111.

During reproduction, the ~1tJSE signal reproduced from the magnetic tape 111 by the rotary heads 109 and 110 is sent to the switch 10.
8 to the reproduction signal processing circuit 112 and the track detection circuit 113. The reproduced signal processing circuit 112 FM demodulates the input MCl5E signal and supplies it to the control signal separation circuit 114 and the terminal 115. Trunk detection circuit 11
3 detects the scanning track switching timing from the input MUSE signal and provides the detected output to the control signal reorganization circuit 116.

The control signal separation circuit 114 separates the control signal from the input MUSE signal and supplies it to the control signal reorganization circuit 116. Control signal reorganization circuit 11
6 performs appropriate processing on each control signal in accordance with the control signal from the logic circuit 118 that controls the tape head system servo circuit 117 and the detection output of the track detection circuit 113, and supplies the processed signal to the terminal 119.

The MUSE signal applied to the terminal 115 and the control signal applied to the terminal 1°19 are sent to the MUSE decoder 120.
The signal is returned to a high-definition television signal at the terminal 121, and is applied to the terminal 121.

The time axis multiplexing reorganization circuit 104 inserts the control signal given from the control signal storage circuit 103 into the audio signal insertion position of the input MUSE signal. However, if you do this, the audio signal will be lost, so by separating the audio signal from the input MUSE signal in the audio signal processing circuit 105 and subjecting it to predetermined processing, it is possible to insert the control signal. This ensures that the audio signal is not lost.

As shown in FIG. 3, the control signal exists over five horizontal scanning periods within one field, and has an information amount of 94 samples per one horizontal scanning period. Also, V
In TR, a fixed control signal (for example, motion detection sensitivity control: in the case of a VTR, the S/N of the reproduced image deteriorates, so if the motion detection sensitivity is not lowered, there will be more moving parts and the resolution will drop. Therefore, it is better to fix the motion detection sensitivity to 1). Considering the above points, a control signal for one field can be inserted at the audio signal position, even if the control signal for multiple fields has an amount of information that fits within one horizontal scanning period.

FIG. 2 shows a track pattern on the magnetic tape 111. Note that FIG. 2 shows the case of double-speed playback in a VTR that has a guard band between video tracks and records one field worth of video signal on one track. As per oral tradition, in double-speed playback, two fields worth of control signals <44.45), (45,46>, etc.) are recorded per track (per field).In this case, each video track ..., 3i.

The control signals recorded in 1E, . . . are the control signals of one track before and two tracks before. Also, by inserting the control signal at the audio signal position as described above, the control signal is transmitted to each video track . . . , 35, 36, . ...located at the beginning of...

When such a magnetic tape 111 is played back at double speed, the head trace becomes 71 720, and the video signal 36a
, 35b, and a control signal 48.45 corresponding to the video signals 38a, 37b.
47 is reproduced, and the control signal can be reproduced without any omission.

Next, the operation of the control signal reorganization circuit 116 will be explained. Regarding the motion vector l (see FIG. 2), the control signal reorganization circuit 116 calculates, for example, a motion vector of 64 by vector addition of auxiliary vectors of 47° and 48 degrees indicating the motion of the image signal 36a and the image signal 38a. Configure using Also, the subsample phase ii (see Figure 2)
For example, a subsample phase code (for example, 48) that matches the image signal 38a is applied during this period.

According to the above configuration, during double-speed playback that scans across two video tracks, control signals for two fields can be played back in one scan, so it is possible to play back control signals for all fields.

As a result, the sub-sample phase code can be correctly input to the decoder, the motion vector can also be set correctly, and a high-quality special playback image without resolution deterioration or image error can be obtained. Further, there is no need to newly provide a special head such as a fixed head.

[Effects of the Invention] As described above, according to the present invention, it is possible to reproduce all control signals during special playback, and it is possible to prevent resolution deterioration during panning and deterioration in the quality of reproduced images. A video signal recording and reproducing device can be provided.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing the configuration of an embodiment of the present invention, and FIG.
The figure shows a track pattern of one embodiment, Figures 3 to 5 are diagrams for explaining the MUSE system, and Figure 6
The figure is a diagram for explaining conventional problems. 100.102,115,119,121... terminal,
101... MUSE encoder, 103... Control signal storage circuit, 104... Time axis multiplexing reorganization circuit, 105... Audio signal processing circuit, 106... Recording signal processing circuit, 107... Addition Circuit, 108... Switch, 109, 110... Rotating head, 111...
・Magnetic tape, 112... Reorganization signal processing circuit, 11
3... Track detection circuit, 114... Control signal separation circuit, 116... Control signal reorganization circuit, 117... Servo circuit, 118... Logic circuit, 120... MUSE encoder. Applicant's agent Patent attorney Takehiko Suzue Figure 3 Figure 4 Figure 5

Claims (1)

[Claims] For each field of a band compression signal obtained by offset subsampling the original video signal between fields and frames, motion vectors and subsample phase information indicating the movement of the original video signal. In a video signal recording and reproducing apparatus that records a video signal obtained by time-axis multiplexing control signals including a video signal onto a tape-shaped recording medium using a rotating head, the video signal is extracted from the video signal at the time of recording and is stored. and a control signal storage means for storing the multiplexed state of the control signals in the video signal using the control signals stored in the control signal storage means so that the control signals of all fields can be reproduced even during special playback. control signal reorganization means for reorganizing a plurality of filters' worth of control signals into a band compressed signal for one field; and a control signal reorganization means for reorganizing the multiplexed state of the control signals. a video signal recording means for recording a video signal on the tape-like recording medium by the rotary head; and a recording speed at which the video signal recorded on the tape-like recording medium by the video signal recording means is recorded by the rotary head. and a signal processing means that processes a band compression signal included in the video signal reproduced by the special reproduction means in accordance with a control signal included in the video signal. video signal recording and reproducing device.