JPH06261291A - Muse decoder - Google Patents

Abstract

PURPOSE:To display plural pictures on the same screen by performing the MUSE processing on inputted all MUSE baseband signals in inputting plural MUSE baseband signals. CONSTITUTION:MUSE baseband signals 2a and 2b for small screen is provided with PLL circuit 5s which detect the synchronized part from transfer data obtained by an A/D converter 3 and detect a control signal and means 4 compression-filtering the transmission data while separately thinning luminance signals and color difference signals in the vertical and horizontal directions. The output data string of the compression filtering processing 4 are stored in a temporary memory 6 so that it can be inserted into the prescribed position on a master screen. A data string 8 after a slave screen compression processing 7 is synthesized by a data string 1 for master screen and an electric switch 9 in the prescribed position. A MUSE signal processing 10 is performed and an R.G.B/Y.Pr.Pb signal 12 is outputted.

Description

Detailed Description of the Invention

[0001]

[Industrial application] A function of picture-in-picture (Pin P) that displays multiple images on the same screen by means of inputting multiple MUSE baseband signals and converting them into a single MUSE baseband signal High-definition MUSE
(Multipule subnyquist sampling encodinng) Decoder related.

[0002]

2. Description of the Related Art In the current television receiver of NTSC system,
Since the luminance Y signal and the color C signal of the transmission NTSC signal are frequency-multiplexed, in order to combine a plurality of input video signals and display them on the same screen, as shown in FIG. The base band video signals 1a and 2a for the parent screen) and the sub screen (child screen) are respectively passed through the Y / C separation circuit 15 to a luminance signal Y, color difference signals RY, BY or R, G,
The R, G, and B video signals are separated by separating them into B video signals, further thinning out the child screen signals from the memory 17 or performing compression conversion processing, and then switching and combining 18 with the parent screen signal.
Outputs 12 mag.

Also in the MUSE type hi-vision television receiver, since the luminance signal and the color difference signal of the transmission MUSE signal are time-division multiplexed, a plurality of MUSE signals are combined as in the conventional current television receiver. In order to display the video signals on the same screen, for example, the motion area processing circuit 20, the still area processing circuit 21, and the color that receive the MUSE baseband signal 1a for the main screen (parent screen) shown in FIG. Signal movement,
Stillness / decompression processing circuit 22, motion detection circuit 23, PLL, control signal detection circuit 5, adaptive mixing, matrix circuit 25,
A memory 27 for thinning out or compressing and converting pixels that receive the MUSE baseband signals 2a and 2b for the sub-screen (sub-screen), a MUSE processing circuit 26, R, G, which is equivalent to the processing of the parent screen.
When the circuit configuration including the synthesizing switch 30 that outputs the B video signal 12 and the like, and the sub-synthesizing image is sufficiently smaller than the main image, the parent screen MUSE baseband signal 1a shown in FIG. 9 is input. MUSE signal processing circuit 32, synthesis switch
Matrix circuit that outputs 30, R, G, B video signals 12, etc.
33, memory 27, PL for thinning or compressing / converting pixels that receive MUSE baseband signals 2a and 2b for sub-screen
L, control signal detection circuit 24, motion area processing circuit 20,
A luminance signal and a color difference signal expanded on the time axis by the circuit configuration including the motion area processing circuit 35 of the color signal, or R, G,
It is conceivable that a predetermined pixel is thinned out by the B signal, the Y, Pr, or Pb signal, or the synthesis conversion is performed after the compression conversion processing is performed.

[0004]

In the MUSE receiver, since the transmitted MUSE signal is a band compression signal,
MUSE not available on current TVs to reproduce images from signals
This is clear even in an example in which a decoder hardware circuit is required and the combined image (sub-image) is sufficiently smaller than the combined image (main image) as in the configuration circuit shown in FIG. 9 of the conventional example. Is. The present invention has been made in view of the above points, and an object thereof is to provide an inexpensive MUSE decoder capable of displaying multiple images (Pin P).

[0005]

In order to achieve the above object, the present invention comprises a PLL and control signal detection circuit corresponding to each of a plurality of MUSE baseband signals, and a plurality of PLL signals other than a specific baseband signal are provided. The baseband signal is time-compressed, scan line-thinned, filtered, and selectively switched and mixed at a predetermined position of a specific baseband signal. In the MUSE signal, the luminance signal and the color difference signal are time-divided, and since the color difference signal is line-sequentially multiplexed, this protocol is followed when switching and mixing. In addition, the MU of the specific baseband signal after the switching and mixing process
In the SE process, the motion compensation vector in the still region is switched to the motion compensation vector in the baseband signal subjected to the switching / mixing process, or the motion amount is controlled so that all the baseband signals subjected to the switching / mixing process become only the motion region signal. It is characterized by doing.

[0006]

With the above-described configuration shown in FIG. 1, when a plurality of MUSE baseband signals are MUSE-decoded and displayed with a predetermined configuration, another MUSE baseband signal is inserted into a specific MUSE baseband signal. Predetermined MUSE decoding processing is performed on the non-decoded portion. For other MUSE baseband signals, a specific
Since it is mixed with a MUSE baseband signal according to a predetermined protocol, it is treated as if it were a part of a specific MUSE baseband signal, and therefore MUSE decoding processing can be performed without the need to separately perform MUSE processing. Becomes

[0007]

Embodiments Embodiments will be described below with reference to FIGS. In FIG. 1, the sub-screen (sub-screen) MUSE baseband signals 2a, 2b system detects the synchronous portion from the transmission data obtained by the A / D converter 3, and thereby synchronizes to detect the control signal. And a means for independently thinning and filtering 4 each of the luminance signal and the chrominance signal in the vertical and horizontal directions of the transmission data. The luminance signal and the color difference signal are processed independently because in the MUSE signal, both signals are time-division multiplexed,
For example, the horizontal direction of the child screen (b) shown in FIG. 3 is compressed to 1/2 and the parent screen (a) is subjected to compression filtering processing (c).
In this case, as shown in FIG. 2, the color difference signal data ck and the luminance signal data yk (a) compressed to 1/2 of the child screen in one horizontal line are converted into the color difference signal data C and the luminance signal data Y ( MU of the main screen (parent screen) superimposed on b) and
Since it is necessary to match with the SE protocol (c), it is performed in each independent area. Also in the case where the vertical direction of the child screen (b) shown in FIG. 5 is compressed to ½ and the compression filtering process (c) is performed on the parent screen (a), as shown in FIG. , BY are line-sequentially multiplexed, the luminance signal and the color difference signal of the sub-screen are subjected to line thinning compression filtering processing independently. The output data string of the compression filtering process 4 is stored in the temporary memory 6 so as to be inserted at a predetermined position of the parent screen, and the data string 8 after the child screen compression process 7 is the parent screen data string 1 (baseband). Signal) and a predetermined position are combined by an electric switch 9 and a predetermined MUSE signal processing 10 is performed, and R, G,
B signal or Y, Pr, Pb signal 12 is output.

In the case of FIG. 3 in which the child screen is compressed and filtered in the horizontal direction, the motion correction vector of the parent screen is valid in the parent screen display area 40, but the child screen display area 41.
In, the motion compensation vector of the sub-picture becomes effective.
That is, in the vertical motion vector, the vertical motion vector detected by the PLL circuit unit 5 is used as it is, and in the horizontal motion vector, a half of the detected horizontal motion vector is used. Similarly, in the case of FIG. 5, the motion correction vector of the parent screen is the parent screen display area.
Although valid in 40, in the small screen display area 41, the motion correction vector of the small screen is valid. That is,
The horizontal motion vector of the sub-picture is used as it is for the horizontal motion vector, and a half of the detected vertical motion vector is used for the vertical motion vector. Further, in the small screen display area shown in FIG. 6 having a large horizontal compression rate and a large vertical compression rate, the maximum amount of motion output from the motion detection unit in the 10 blocks of the MUSE signal processing is set to the small screen display area. All may be treated as motion area processing.

In the MUSE processing, since the input baseband signal is subjected to predetermined filtering processing vertically and horizontally, a slight gap 42 is formed at the horizontal and vertical breaks 42 between the parent screen and the child screen shown in FIG. 6C. Blurring is not preferable. Therefore, in the signal after the MUSE signal processing 10, an arbitrary signal pattern is formed in the pattern portion 11 at the break 42 shown in FIG.
Insert by.

[0010]

As described above, according to the present invention, when a plurality of MUSE baseband signals are input, the plurality of input MUSE baseband signals can be processed without applying independent MUSE decoding processing to each MUSE baseband signal. It is possible to provide a low-priced MUSE decoder capable of performing multiple image display (P in P), which makes it possible to perform predetermined MUSE processing on all signals.

[Brief description of drawings]

FIG. 1 is a block diagram of a multiple image display (P in P) processing circuit by inputting multiple MUSE baseband signals.

2 is a luminance / color signal compression data diagram in a horizontal line of a parent / child screen for explaining FIG. 1; FIG.

FIG. 3 is a horizontal child screen compression composite diagram of FIG. 1;

FIG. 4 is a compression filtering process diagram of luminance / color signals for explaining FIG. 1;

FIG. 5 is a view showing the compression of the child screen in the vertical direction in FIG.

FIG. 6 is a child-picture compression / synthesis diagram having a large horizontal / vertical compression ratio in FIG. 1;

FIG. 7 is a block diagram of a conventional multiple image display processing circuit in the NTSC system.

FIG. 8 is a block diagram of a conventional multiple image display processing circuit in the MUSE system.

FIG. 9 is a block diagram of another multi-image display processing circuit in the conventional MUSE system.

[Explanation of symbols]

1 MUSE baseband signal for main screen (data string) 2a MUSE baseband signal for subscreen 3 Analog / digital converter 4 Luminance / color difference signal independent line thinning compression filtering 5 PLL / control signal detection circuit 6 Memory 7 Child screen compression Processing 8 Data stream for sub-screen 9 Switch 10 MUSE processing circuit 11 Signal pattern section 15 Y / C separation circuit 20 Motion area processing circuit 21 Still area processing circuit 22 Color signal motion / still / expansion processing circuit 23 Motion detection circuit 25 Adaptation Mixing and matrix circuit 27 Memory 32 MUSE processing circuit 35 Color motion area processing circuit

Claims (4)

[Claims] 1. A still region and a motion region of a MUSE baseband signal transmitted by the MUSE system are separated, and the still region is interpolated between frames and inter-field interpolated, and the motion region is divided into fields. After the interpolation processing, the still area and the moving area are adaptively mixed according to the motion detection,
In a MUSE decoder for converting R, G, B signals or Y, Pr, Pb signals, a memory for delaying a plurality of MUSE baseband signals other than a specific one MUSE baseband signal at a plurality of inputs of the MUSE baseband signals And a mixing means for superimposing the single MUSE baseband signal on the same signal line as a single MUSE baseband signal, the single MUSE baseband signal being an R, G, B video signal. Or a MUSE decoder which is converted into Y, Pr and Pb signals. 2. When mixing a plurality of other MUSE baseband signals with the specific one MUSE baseband signal, the protocol of the specific one MUSE baseband signal luminance signal and line sequential color signal 2. A plurality of MUSE baseband signals are thinned out and filtered.
The described MUSE decoder. 3. In the static region processing of the unified MUSE baseband signal, there is provided a means for changing a motion correction vector by a predetermined amount in a plurality of MUSE baseband signals other than the specific MUSE baseband signal, When adaptively mixing the static region processing and the motion region of the unified MUSE baseband signal according to the motion detection, this is compulsorily performed in a plurality of MUSE baseband signals other than the specific MUSE baseband signal. The MUSE decoder according to claim 1, further comprising means for setting a motion area. 4. In the R, G, B video signals or Y, Pr, Pb signals converted from the MUSE baseband signal, MUSE in a switching region between a specific MUSE baseband signal and a plurality of other MUSE baseband signals. 2. The MUSE decoder according to claim 1, further comprising means for inserting a specific signal pattern into vertical and horizontal breaks by signal processing.