JPH07105966B2 - Still image signal playback device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reproducing apparatus for reproducing high-quality still picture television signals recorded by applying band compression to a recording medium such as an optical disc.

2. Description of the Related Art When transmitting a wideband video signal such as a high-definition television signal using one channel of a broadcasting satellite, a method of reducing the signal bandwidth by sub-Nyquist sampling is "a new transmission method for high-definition television ~ MUSE ~ "(NHK Giken Monthly Report, July 1984). This method is called a motion-compensated multiple sub-Nyquist sampling transmission method. Specifically, the sampling phase is offset between fields and frames, and processing is performed so that the sampling phase makes one cycle in four fields. Which transmits a video signal having a frame memory on the receiving side, records the video signal transmitted thereto, and combines signals of four fields transmitted sequentially to restore one television image. Is.

In this MUSE method, as disclosed in the reference, a control signal group called a control signal used to restore the MUSE signal in the format shown in FIG. 2 is baseband multiplexed in the vertical blanking period of the video signal. To be done. The control signal is composed of a control signal group consisting of 32 bits as shown in FIG. 3, and is used for controlling various signal processes at the time of restoration. This is a video disc record
It is also added when recording the MUSE signal. MUSE
A still image is recorded on a video disc record in a signal form of a transmission system, and a video disc player as a reproducing device thereof is disclosed in Japanese Patent Laid-Open Nos. Sho 60-191595 and Sho 60-191596. In the former example, when recording a still image signal on a disc record, a control signal called an address signal is multiplexed to control the random access function in the video disc player and to continuously reproduce the still image signal. The pickup is performing track jump control. Further, in the latter example, a memory is provided for reproducing a still image recorded on a video disc record in the CLV (constant linear velocity) mode, and a still image signal forming one screen, that is, a MUSE signal for four fields is temporarily changed. A control signal called a stop code signal is multiplexed with a still image signal as a signal that serves as a trigger for being taken into the memory.

Problems to be Solved by the Invention In each of the examples described in the above publications, in each case, a new control signal other than the control signal transmitted by the MUSE method, which is an address signal or a stop code signal, is multiplexed on each still image signal. However, both of these signals remain a single control for the video disc player. Further, these control signals take an area in the spare area of the control signal, and the signal is added on the recording side by newly adding a control signal other than the signal originally multiplexed to the MUSE signal and performing FM modulation. However, there is a problem in that the effect expected by adding these new signals is small, such as an increase in hardware for.

In view of such a point, the present invention originally has a sub-sample phase control signal (hereinafter, CSSP signal [Croma Sub-Sample Phase signal]) relating to a color component of a 32-bit control signal that is multiplexed and recorded in a video signal by the MUSE method. The address signal given as a conventional example,
A still image signal that reproduces a still image recorded on a recording medium such as an optical disc without multiplexing a new control signal such as a stop code signal and recording and without requiring any change in the hardware of the video signal recording side. An object is to provide a reproducing device.

According to the present invention, CSSP of control signals called 32-bit control signals, which are multiplexed and recorded in a vertical blanking period of a video signal, on a recording medium such as an optical disk is used. A signal is used to control a pickup to perform a track jump during a four-field period recorded in synchronization with a change in the signal polarity of the signal, thereby forming a common still image in four fields of a high-definition television signal. Characterized by continuous reproduction of minutes.

The present invention has the above-described configuration and reproduces a still image signal in a video disc player by using a CSSP signal of a control signal called a control signal multiplexed and recorded during a vertical blanking period of a video signal. Can be done.

Embodiments Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an embodiment of a still image signal reproducing apparatus according to the present invention.

In FIG. 1, a disk 1 is time-multiplexed with a positive horizontal synchronizing signal, a line-sequential color signal, and a luminance signal in the form as shown in FIG. Are multiplexed in the vertical blanking period of the video signal and are both FM-modulated and recorded.

At the time of reproduction, a light beam is emitted from the pickup 3 to the information on the disk 1 which is rotationally driven by the spindle motor 2, and the reflected light is detected, converted into an electric signal, and sent to the reproduction circuit 4. The reproducing circuit 4 FM demodulates the signal amplified by the head amplifier in the pickup, performs signal processing such as time axis correction, outputs the MUSE signal from the signal terminal 5 as the output of the video disc player, and outputs the vertical signal of the video signal. The MUSE signal is also supplied to the detection circuit 6 in order to detect the CSSP signal in the control signal group called the control signal multiplexed in the line period. In the detection circuit 6, the bit number 10 of the control signal as shown in FIG.
Processing to detect the CSSP signal existing in the.

According to the references, the MUSE method allows color components to have a wideband signal (C _W
Signal) and narrowband signal ( _CN signal), each of which is compressed to 1/4 and line-sequentially time-axis multiplexed in the horizontal blanking period, and 4 fields having a sampling pattern as shown in FIG. Sub-Nyquist sampling is performed in one cycle. Here, ○ is the 4nth, □ is the 4n + 1st, and ● is the 4n + 2.
The second and black squares indicate sampling points transmitted in the 4n + third field, and the positions indicated by x indicate sampling points at which no signal is transmitted. Further, the solid lines indicate scanning lines in odd fields, and the dotted lines indicate scanning lines in even fields. According to this sampling pattern, the transmitted signal is sequentially stored on the receiving side, and in the case of a still region from an image signal of four consecutive continuous fields, image reproduction is performed using all the points shown in FIG. However, in the case of a moving area, if the past sampling points are used, obstacles such as multi-line blurring and halftone dots occur, so that image reproduction is performed using only the sampling points of the current field. However, the video signal of the past field is translated and overlapped with the current field in response to the movement caused by the parallel movement of the imaging device such as the panning and tilting of the camera, and the entire screen is treated as a still area. Motion compensation. When this motion correction is performed, the sampling phase changes according to the amount of motion. Therefore, the motion amount of the video signal is a part of the control signal that is multiplexed in the vertical blanking period of the video signal on the transmission side, and the sampling phase is the sub-sample phase control signal for the luminance component and the color component, respectively. Assigned and transmitted.

As is clear from the sampling pattern shown in FIG. 4, when the video signal is viewed on a pixel-by-pixel basis, pixels that are transmitted and pixels that are not transmitted are arranged alternately. The sampling phase is a pair of the transmission pixel and the non-transmission pixel and indicates which position the transmission pixel is located on the right or left side. The sampling phase is one cycle of four fields of two field alternation due to the inter-frame offset. is there. However, when the screen moves in parallel and the sampling positional relationship changes because the motion correction processing described above is also used, it is necessary to change the sampling phase of the luminance signal according to the amount of movement. However, since the chrominance signal is compressed to 1/4 of the luminance signal, it is not possible or necessary to change the sampling phase with the same accuracy as in the case of the luminance signal. Therefore, the sub-sampling phase control signal (CSSP signal) of the color component described in the present invention is always defined as a signal that changes in two field alternation. Further, the present invention aims to reproduce a recording medium on which a still image signal is recorded,
When the video signal is completely stationary, the above-mentioned motion vector does not occur, so the CSSP signal and the sub-sample phase control signal of the luminance component are always fixed phases. It is also possible to use the track jump control together with.

The CSSP signal of the form described above is sent to the control circuit 7, where the CSSP signal repetition period, that is, the video signal 4
The pickup 3 is controlled so as to make a track jump in the return direction at the field cycle, and it is possible to continuously reproduce a high-definition television signal forming one still image.

A still image signal recorded on a recording medium such as an optical disc is continuously recorded with 4 fields as a constituent unit of one image, so a still image signal recorded using a certain 4 fields is used. Basically, there is no correlation between the still image signal recorded by using the four fields before and after it. Therefore, as shown in FIG. 5, for example, a CSSP signal alternating in two fields at the head position 11 of a video signal in a four-field period which constitutes one still image.
If you define the relationship so that the polarity of 12 rises,
If the pickup is controlled to make a track jump at the rising position of the CSSP signal 12, one of the still image signals continuously recorded can be continuously reproduced without error.

FIG. 6 schematically shows recording tracks formed on the disc 1 reproduced by a video disc player in which a spindle motor is rotated at a frame cycle and recording positions of CSSP signals. The head position of each field, in particular, the ∘ mark indicates the head position of the head field forming one image signal, and the X mark indicates the multiplexing position of the CSSP signal. Since the disc rotates in the frame cycle, video signals for two fields can be recorded in one round of the disc, and as is clear from FIGS. 2 and 3, the CSSP signal multiplexed in the vertical blanking period in each field is Since it is in the same position in all fields, the CSSP signal of the odd field (...
S _3n-1 , S _1n , S _3n , S _{1n + 1} …) and even field CSSP signals (… S _4n-1 , S _2n , S _4n , S _{2n + 1} …) are recorded in the tracking direction. Be lined up. Since the CSSP signal is regulated to rise when the recording position on the disc is S ₁ , the control circuit 7 detects the state, and at the position of the circle indicated by T _n , the direction of the arrow indicated by T _i becomes 2 The pickup 3 is caused to make a track jump to the position of the circle indicated by T _n-1 on the inner circumference side of the track.

The still image signal reproducing apparatus according to the present invention is referred to as a control signal which is multiplexed and recorded during the vertical blanking period of the video signal.
Of the 32-bit control signals, by using the CSSP signal, it is possible to easily reproduce a still image without adding a control signal for the purpose of still image reproduction. If the MUSE decoder is downsized and integrated with the video disc player, the same function can be obtained by using the CSSP signal detected in the MUSE decoder part. The circuit is further simplified, and its practical effect is great.

[Brief description of drawings]

FIG. 1 is a block diagram of a still image signal reproducing apparatus according to an embodiment of the present invention, FIG. 2 is a format diagram of a signal transmitted by the MUSE system, and FIG. 3 is a bit allocation of a control signal called a control signal. Fig. 4 and Fig. 4 are sampling pattern diagrams in the MUSE system, Fig. 5 is a diagram showing the positions of still image signals and CSSP signals recorded on the disc, and Fig. 6 is to rotate the spindle motor at a frame cycle. It is a mimic diagram showing recording tracks formed on a disc reproduced by such a video disc player and recording positions of CSSP signals. 1 ... Disc, 2 ... Spindle motor, 3 ... Pickup, 4 ... Playback circuit, 5 ... Signal output terminal, 6 ...
… Detection circuit, 7 …… Control circuit, 11 …… Start position of video signal, 12 …… CSSP signal.

Continuation of front page (51) Int.Cl. ⁶ Identification code Office reference number FI Technical display area H04N 9/87 A

Claims (2)

[Claims] 1. A predetermined control signal including at least a sub-sampling phase control signal for controlling a sampling phase between frames and fields, time-multiplexes a color component and a luminance component, and performs band compression by a sub-sampling method. Still image reproducing apparatus for reproducing a recording medium such as an optical disc recorded with a high-definition television signal which is multiplexed in the vertical blanking period of the applied video signal and constitutes one still image in four fields. A reproducing circuit for reproducing the television signal from the recording medium such as the optical disc, a control signal detecting circuit for detecting a sub-sampling phase control signal from the reproduced video signal, and a control signal detecting circuit It has a tracking control circuit that causes the pickup to make a track jump in the return direction, and forms a common still image with high quality. Still image signal reproducing apparatus characterized by continuously reproducing the four fields of the revision signal. 2. A high-definition still image television signal in which the relationship between the leading scanning position of a common still image having 4 fields as a unit and the polarity of the sub-sampling phase control signal of the color component alternating in 2 fields is defined. A still image signal reproducing apparatus according to claim 1, which reproduces a recording medium such as an optical disc on which the image is recorded.