JPH06121285A - Reproduction device - Google Patents

Abstract

PURPOSE:To reproduce a still picture with high quality and less picture blur. CONSTITUTION:Reproduction data from a DAT 50 are fed to RAMs 22A, 22B. When one of the RAMs 22A, 22B is in the write state, the other is in the read state. Only when it is recognized that data in the write state is a complete still picture in one of the RAMs 22A, 22B, after write of data by 4 fields is finished, the state of the write/read of the RAMs 22A,22B is switched. Data of a complete still picture by 4 fields are repetitively read and fed to a MUSE decoder 28 and a still picture is displayed on a monitor television receiver 29. In order to take full resolution, even when data by 4 fields are recorded as still picture data by one pattern, the still picture with high quality and less picture blur is reproduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reproducing apparatus for sequentially reproducing a plurality of screens of MUSE signal from a recording medium to obtain still image data.

[0002]

2. Description of the Related Art As a method for compressing a transmission signal band of a television signal, MUSE (Multiple Sub-nyquist Samp) is used.
ling Encoding) is known. MU
In the SE encoder, band compression is performed by line offset subsampling in the motion system and field offset and frame offset subsampling in the static system.

On the other hand, in the MUSE decoder, in the motion system, the image is reproduced only by the signal of the current field by the field interpolation, and in the stationary system, the image is reproduced by the signals of the current field and the past three fields by the inter-frame and inter-field interpolation. To be done. As a result, in a stationary system, full resolution is provided, and in a moving system, the resolution is reduced to ¼, but image blurring is prevented.

In the MUSE system, a high-definition television signal (video signal bandwidth = 20 MHz) is band-compressed and transmitted. According to the high-definition standard, the number of scanning lines per frame is 1125, the interlace ratio is 2: 1, the aspect ratio is 16: 9, the field frequency is 60 Hz, and the line frequency is 33750 Hz.

FIG. 7 shows a format of a television signal transmitted by the MUSE system (hereinafter referred to as "MUSE signal"). The MUSE signal has data of 480 samples in each of 1125 horizontal lines, and a frame pulse is added to the beginning of each frame and a horizontal synchronizing signal is added to the beginning of each line.

[0006]

By the way, it is conceivable to record and reproduce such MUSE signal as still picture data by, for example, a DAT (digital audio tape recorder).

In order to obtain the full resolution, data may be extracted from the MUSE signal for a moving image in units of 4 fields and recorded, and a still image may be played back using the data for 4 fields. However, when the data for four fields is moving image data, a large image blur occurs in the still image.

The MUSE signal is sampled at 16.2 MHz, and in the case of 4 fields (2 frames),
1125 × 2 × 480 = 1,080,000 samples. When one sample is 8 bits, it is 8,640,000
Bits (≈8.24 Mbits).

If the data for four fields is recorded and reproduced by DAT as still image data, the data recording / reproducing speed in DAT is 1,536,000 bits (4
8 kHz x 2 channels x 16 bits) / sec,
It will take 5.625 seconds. That is, in the video system, the data of 4 × 1 / 60≈66.7 ms is DAT.
In this system, the data is 5.625 seconds.

According to the present invention, a still image with little image blur can be displayed during reproduction.

[0011]

SUMMARY OF THE INVENTION According to the present invention, in a reproducing apparatus for outputting MUSE signals which are sequentially reproduced in screen units through a memory means, a motion for detecting motion information from a control signal of MUSE signals for each screen is provided. Information detecting means is provided, and the operation of the memory means is controlled according to the motion information detected by the motion information detecting means.

[0012]

[Function] Bit N of control signal of MUSE signal
o. Motion information is contained in 16 to 18. According to the motion information detected by the motion information detecting means, one screen of data being written in the memory means is a still image (complete still image,
It is possible to know whether it is quasi-still image data or moving image data. For example, when the data is not complete still image data, the written data for one screen is invalidated, and the complete still image data written before that is read out again and output. As a result, the moving image data is not read out from the memory means and output, and even if the moving image data is recorded in units of four fields, it is possible to prevent image blurring in the reproduced still image.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. This example is an example in which the MUSE signal is recorded and reproduced as still image data by DAT.

FIG. 2 shows the structure of the recording system. In the figure, a satellite broadcast signal captured by a satellite broadcast (BS) antenna 1 is supplied to a BS tuner 2. BS
The MUSE signal output from the tuner 2 is band-limited by the low-pass filter 3 and further converted into a digital signal by the A / D converter 4, and then the a-side and b-side of the changeover switch 5
It is supplied to the RAMs 6A and 6B as buffers via the side.

The output signal of the A / D converter 4 is supplied to the synchronization detection circuit 7, and the frame pulse signal and horizontal synchronization signal detected by the synchronization detection circuit 7 are supplied to the controller 8. The controller 8 has 48 kHz × 4 = 192 kHz from the DAT 50 in order to synchronize with the DAT 50.
System clock CLK is supplied.

Writing and reading to and from the RAMs 6A and 6B are controlled by the controller 8, and the RAMs 6A and 6B are controlled.
6B, when one is in the write state, the other is in the read state. That is, M in RAM 6A or 6B
When data of four fields of the USE signal is written as still image data, RAM6B or 6A, respectively.
To DAT50 data recording speed (1,536,000
The data for 4 fields is read out in synchronization with (bit / sec). In this case, data for 4 fields (8, 6
(40,000 bits) is read in a time of 5.625 seconds.

Here, while four fields of data are read from one RAM at the recording speed of the DAT 50, many field signals are supplied as write signals to the other RAM to sequentially update the data content. The data for four fields is always stored.

After the reading of the data of four fields from one RAM is completed, the writing and reading states of the RAMs 6A and 6B are switched. At this time, the other RAM stores data for four fields immediately before switching.

The still image data read from the RAMs 6A and 6B are supplied to the a side of the changeover switch 10 via the a side and the b side of the changeover switch 9, respectively. The changeover of the changeover switches 5 and 9 is controlled by the controller 8. The changeover switch 5 is a when the RAM 6A is in the write state.
When the RAM 6B is connected to the RAM 6B and is in a write state, b
Connected to the side. The change-over switch 9 is connected to the a side when the RAM 6A is in the read state and is connected to the b side when the RAM 6B is in the read state.

Reference numeral 11 denotes a synchronization generation circuit, and the synchronization pattern signal PS output from the synchronization generation circuit 11 is supplied to a fixed terminal on the b side of the changeover switch 10. The operation of the synchronization generating circuit 11 and the switching of the changeover switch 10 are controlled by the controller 8.

That is, immediately before the data for four fields is supplied to the a side of the changeover switch 10, the synchronization generating circuit 1
1 outputs the synchronization pattern signal PS. Although not described above, the reading of data for four fields from the RAMs 6A and 6B will be started after the output of the synchronization pattern signal PS. The change-over switch 10 is connected to the a side when the data for four fields is supplied to the a side, and is connected to the b side when the synchronization pattern signal PS is supplied to the b side.

Therefore, from the changeover switch 10, the synchronization pattern signal P is added to the head of the data for each four fields.
The one with S added is output (shown in Figure 3), which is D
It is supplied to the AT50 and recorded.

Next, FIG. 1 shows the structure of the reproducing system. In the figure, four fields of data sequentially reproduced from the DAT 50 are alternately supplied to and written in the RAMs 22A and 22B as buffers via the a side and the b side of the changeover switch 21.

The reproduction signal of the DAT 50 is supplied to the sync detection circuit 23. The sync detection circuit 23 detects the sync pattern signal PS added to the beginning of the data for four fields, and the detected signal SD is used as the detection signal SD.
4 is supplied as a signal (cueing signal) indicating the start timing of data for 4 fields. A system clock CLK of 192 kHz is supplied from the DAT 50 to the controller 24.

Further, the reproduction signal of the DAT 50 is supplied to the motion information detecting circuit 35. The bit number of the control signal detected by the detection circuit 35. The 16-18 motion information is supplied to the controller 24.

The control signal existing in the format of the MUSE signal of FIG. 7 has 2 samples as 1 bit,
It is multiplexed as a binary signal. The code format is the extended Hamming (8,4) code. The generator matrix and the binary level are defined as shown in FIG. However, the left 4 bits of the generator matrix are transmitted as information points and the right 4 bits are used as check points and are transmitted from the left. The control signal has 32 bits as a whole, and if it is divided into 4 bits, it becomes 8 blocks, which are transmitted 3 times. FIG. 5 shows the multiplex position of the control signal, and the portion E is not used in a normal MUSE decoder. FIG. 6 shows the contents of the 32-bit control signal.

Writing and reading of the RAMs 22A and 22B are controlled by the controller 24. The changeover of the changeover switch 21 is controlled by the controller 24, and is connected to the a side when the RAM 22A is in the writing state, and is connected to the b side when the RAM 22B is in the writing state.

When one of the RAMs 22A and 22B is in the writing state, the other is in the reading state. That is, when data of four fields of the MUSE signal is written in the RAM 22A or 22B, the RAM
Data of 4 fields is repeatedly read from 22B or 22A in synchronization with a 16.2 MHz clock.

In this case, when it is recognized from the motion information that the data being written is of a completely still image, the writing of the data in the RAMs 22A and 22B is completed after the writing of the data of four fields into one RAM is completed. , The read state is switched. Then, this time, the data reproduced from the DAT 50 is written to the other RAM, and the data for four fields is repeatedly read from the one RAM.

Although not described above, the motion information detected in each field of the MUSE signal relates to the next field. Therefore, if the motion information detected from the reproduction data of the third or fourth field indicates a complete still image, the data for four fields is of a complete still image. That is, the controller 24 determines whether or not the data being written is a completely still image based on the motion information detected from the reproduction data of the third or fourth field.

On the other hand, when it is recognized from the motion information that the data being written is not a completely still image, one R
Even after the writing of the data for four fields to the AM is completed, the writing and reading states of the RAMs 22A and 22B cannot be switched. And again, DA in one RAM
Data reproduced from T50 is written, and data for four fields (complete still image data) is repeatedly read from the other RAM.

Data for four fields (still image data) according to the format of the MUSE signal repeatedly output from the RAMs 22A and 22B is stored in the selector switch 25a.
Side and b side to the MUSE decoder 28.
Switching of the changeover switch 25 is controlled by the controller 24, and is connected to the a side when the RAM 22A is in the read state, and is connected to the b side when the RAM 22B is in the read state.

The video signal (for example, R, G, B signals) output from the MUSE decoder 28 is supplied to the monitor television 29, and a still image is displayed on the monitor television 29.

In this example, when it is recognized from the motion information detected by the motion information detection circuit 35 that the data being written in the RAMs 22A and 22B is a complete still image, four fields to one RAM are stored. After the writing of the minute data is finished, writing to the RAMs 22A and 22B,
The read state is switched, while the RAM 22A,
When it is recognized that the data being written in 22B is not of a complete still image, the RAMs 22A, 22A are
The writing and reading states of B cannot be switched.

Therefore, data of four fields which are complete still image data are repeatedly read from the RAMs 22A and 22B, supplied to the MUSE decoder 28 through the changeover switch 25, and the still image is displayed on the television monitor 29. It Data for four fields is recorded as one screen for full resolution, and at the time of recording, quality without image blurring is achieved without performing operations such as selecting and recording only complete still image data. High-quality still images can be obtained.

In the above embodiment, the still image is obtained only by the data of the complete still image, but the still image may be obtained by the data of either the complete still image or the quasi still image. . In that case, if the motion information detected by the motion information detection circuit 35 indicates either a complete still image or a quasi-still image, the RAM 22 is written after the writing of four fields of data to one RAM is completed.
The writing and reading states of A and 22B are switched. In the case of a still image based on either complete still image data or quasi-still image data, it is possible to obtain a high-quality still image with little image blur.

Further, in the above-mentioned embodiment, the synchronization pattern signal PS is added to the head of the data for four fields, but dummy data of a predetermined length (for example, continuous data of 128 levels) is used in the recording system. , 0 level and 2
Alternate continuous data of 55 levels, etc.) may be added, and the reproducing system may detect the end of the dummy data and recognize the start of the data for four fields.

In the above embodiment, two RAs are used.
Although M6A and 6B (22A and 22B) are used, one or three or more may be used.

[0039]

According to the present invention, the operation of the memory means for writing the reproduction data is controlled based on the motion information detected by the motion information detecting means. Therefore, for example, only complete still image data can be output from the memory means, four fields of data are made into one screen of still image data in order to obtain the full resolution, and moreover, at regular intervals from the MUSE signal. Even if you capture and record the data of, you can play back high quality still images without image blur.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a reproduction system according to an embodiment.

FIG. 2 is a block diagram showing a configuration of a recording system according to an embodiment.

FIG. 3 is a diagram showing a structure of recording data of DAT.

FIG. 4 is a diagram for explaining a format of a control signal of a MUSE signal.

FIG. 5 is a diagram showing a multiplexing position of a control signal of a MUSE signal.

FIG. 6 is a diagram showing the contents of a control signal of a MUSE signal.

FIG. 7 is a diagram showing a format of a MUSE signal.

[Explanation of symbols]

 2 BS tuner 6A, 6B, 22A, 22B RAM 7,23 Sync detection circuit 8,24 Controller 11 Sync generation circuit 28 MUSE decoder 29 Monitor TV 35 Motion information detection circuit 50 DAT

Claims (3)

[Claims] 1. A reproducing apparatus for outputting MUSE signals sequentially reproduced on a screen-by-screen basis through a memory means, provided with motion information detecting means for detecting motion information from a control signal of the MUSE signals for each screen. A reproducing apparatus for controlling the operation of the memory means according to the motion information detected by the motion information detecting means. 2. When recognizing that one screen of data written in the memory means is not still image data by the motion information, the written one screen of data is invalidated and written before that. The reproducing apparatus according to claim 1, wherein the read data is read again and output. 3. The memory means is provided with first and second memory sections, and when the first and second memory sections are in a write state, the other is in a read state, and the first or second memory section is provided. Only when the MUSE signal is written in screen units in the second memory unit and the data for one screen written in the first or second memory unit is recognized as still image data by the motion information. 2. The reproducing apparatus according to claim 1, wherein the writing and reading states of the first and second memory sections are switched after the writing of data for one screen is completed.