JP3223915B2 - Video switching synthesis device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for processing television signals, and more particularly to a standard definition television (SDTV) signal and a high definition television (HDTV).
The present invention relates to a video switching / synthesizing device capable of processing by switching between signals.

[0002]

2. Description of the Related Art The SDTV system is based on NTSC (National T
elevision System Committee), which is a general television broadcasting system and has been widely used in the past. On the other hand, the HDTV system is intended for broadcasting a high-definition video signal. For example, in Japan, MUSE (Multiple Sub-Nyquist S) is used.
Broadcasting has already been started by the ampling encoding method. As for the HDTV signal, a video standard within a broadcasting station applicable to digital processing is S.
MPTE standard 292M and SMPTE standard 296M are known. The HDTV system requires a large amount of information to increase the definition of a video, and therefore requires a wider transmission band than the SDTV system.

On the other hand, for example, digital television broadcasting using broadcast satellites or terrestrial waves is currently being prepared. In such digital television broadcasting, MPE
Since a G-encoded signal is transmitted, an SDTV signal can be used to broadcast multiple channels. Therefore, a broadcast system capable of performing switching between a multi-channel SDTV signal broadcast and a one-channel broadcast using an HDTV signal is realized. .

[0004] A broadcasting station that sends out these SDTV signals and HDTV signals not only selects and sends out SDTV signals and HDTV signals, but also receives a plurality of video signals to create a video signal to be sent out. In order to create a screen-division multiplex composite screen, video compositing processing is performed as needed.

[0005] Since the video signal of the SDTV signal and the video signal of the HDTV signal have different bands (frequency) and formats, conventionally,
For such a video switching synthesis process, an SDTV video switching synthesis device corresponding to each video signal and an HDT
It was necessary to have a V-video switching / synthesizing device separately. That is, if the SDTV signal is a serial digital component signal of SMPTE standard 259M, the band is 27
0 bps, and the HDTV signal is SMPTE standard 292
This is because the transmission speed of the serial digital component signal of M is 1.5 Gbps.

FIG. 8 shows an SDTV video switching / synthesizing apparatus 1 and H
1 shows a configuration of a conventional digital broadcasting system having a DTV video switching / synthesizing device 8 separately. In the conventional broadcasting system shown in FIG. 8, the SDTV video signal supplied from the input terminals IS1 to ISm selects any two of them, for example, in the SDTV switch 2 and selects and switches the selected SDTV. Three sets of video signals are supplied to the video signal synthesis circuits 3, 4, and 5, respectively. In the video signal synthesizing circuits 3, 4, and 5, the two input S
The DTV video signals are synthesized according to the control of the screen effect, and the synthesized SDTV video signals are output as Os1, Os2, and Os.
As No. 3, it is supplied to the SDTV encoders 6e1 to 6e3. Each encoder compresses and encodes the 270 Mbps SDTV signal and supplies it to the multiplexing circuit 7 as a signal of about 6 Mbps.

On the other hand, the HDTV video signal supplied from the input terminals IH1 to IHn is
Switching is performed so that, for example, any two of the signals are selected and supplied to the video signal synthesizing circuit 10. In the video signal synthesizing circuit 10, the two input HDs
The TV video signal is synthesized according to the control of the screen effect, and the synthesized HDTV video signal is supplied to the SDTV encoder 11 as an output Oh. In the encoder 11, 1.
About 20Mb by compressing and encoding 5Gbps HDTV signal
The signal is supplied to the multiplexing / selection circuit 7 as a signal of ps.

The multiplexing / selecting circuit 7 multiplexes the three-channel compressed SDTV signal and selectively outputs the multiplexed three-channel SDTV signal and one-channel compressed HDTV signal.

[0009]

However, in the configuration of the above-mentioned conventional digital broadcasting system, a video switch and a video signal combining circuit for an SDTV signal and a video switch and a video signal combining circuit for an HDTV signal are separately provided. Will be required. Furthermore, since the HDTV signal has a video signal rate of 1.5 Gbps and requires high-speed signal processing, there is a problem that the scale and cost of the video switch and the video signal synthesis circuit tend to increase. .

[0010] Accordingly, the present invention has been made in view of the above-mentioned circumstances, and has as its object to provide an SDTV signal and an H signal.
It is an object of the present invention to provide a video switching / synthesizing apparatus capable of performing common switching / synthesizing processing with a DTV signal.

Another object of the present invention is to provide a video switching / combining apparatus which does not require high-speed switching / combining processing of an HDTV signal.

[0012]

According to a first aspect of the present invention, there is provided an image switching / combining apparatus.
A number of digitized high-definition televisions ("
HDTV), a plurality of sets of low-speed HDTV signals
Input conversion means for dividing the signal into a plurality of signals and outputting the signals, and a plurality of digitized standard televisions (hereinafter abbreviated as SDTV)
Signal or the low-speed HDTV signal of the input converter
Switching means for switching so as to select a plurality of sets of signals corresponding to the number of divisions of the DTV signal; and a plurality of signals provided corresponding to the plurality of sets of signals and for synthesizing the arbitrary number of signals. Synthesizing means, and an output converting means for synthesizing an output of each of the signal synthesizing means to output an HDTV signal, and a plurality of sets of SDTV signals synthesized by the arbitrary number from the plurality of signal synthesizing means; The apparatus is characterized in that it is configured to output the arbitrary number of synthesized HDTV signals from the output conversion means in response to switching of the switching means.

In the configuration of the present invention, the input converting means divides each of the plurality of digitized HDTV signals into a plurality of sets of low-speed HDTV signals and outputs them, and the switching means outputs the plurality of digitized SDTV signals or Switching is performed so as to select a plurality of sets of signals corresponding to the number of divisions of the HDTV signal from the low-speed HDTV signals of the input converter, and the signal combining means provided corresponding to the plurality of sets of signals respectively performs An arbitrary number of signals are synthesized, and the output converting means synthesizes the outputs of the signal synthesizing means to output an HDTV signal, whereby a plurality of sets synthesized by the arbitrary number from the plurality of signal synthesizing means are output. In response to the switching of the switching means. Because, SDTV signal and the HDTV
It is possible to provide a video switching / synthesizing apparatus that can perform common switching / synthesizing processing on a signal and a single apparatus and that does not require high-speed signal processing.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. The description will be made specifically using an embodiment.

FIG. 1 is a block diagram of a digital broadcasting system employing the video switching synthesis according to the present invention.
The V signal and the HDTV signal are commonly supplied to one video switching / combining device 12. The video switching / synthesizing device 12 outputs a 4-channel SDTV signal Os1 that has been synthesized.
To Os4, and outputs one-channel HDTV signal Oh.
6e4 and 11 and then to the multiplexing circuit 7. Encoders 6e1-6e4, 11 and multiplexing
The selection circuit 7 may be the same as the conventional example shown in FIG. still. In FIG. 1, the number of the synthesized SDTV signals is larger by one channel, but the multiplexing / selecting circuit 7 may select and multiplex three of them. Further, if three outputs are selected from the four outputs Os1 to Os4 at the output stage of the video switching / synthesizing device 12, the number of encoders 6 may be three as in FIG. Hereinafter, the video switching and synthesizing device 12 will be described in detail.

FIG. 2 shows a video switching and synthesizing apparatus 12 according to the present invention.
(FIG. 1) shows the configuration. In the figure, the portion that performs the switching function includes a switch 13 and input converters 14c1 to 14cn that convert the HDTV signals so that they can be switched in common. The SDTV signals from the input terminals Is1 to Ism are supplied as they are to the cross points of the switch 13 arranged in a matrix. First, the HDTV signals from the input terminals Ih1 to Ihn are input to the input converters 14c1 to 14c.
n, the data is converted into four pieces of parallel data Y1, Y2, Pr, and Pb signals so as to be able to perform switching processing in common with the SDTV signal, and supplied to the cross points of the switch 13 arranged in a matrix.

FIG. 3 shows an SDTV input to the switch 13.
FIG. 4 is a diagram showing signal formats of a signal and an HDTV signal;
As shown in FIG. 3A, the SDTV signal is component-type serial digital data, and includes luminance signals Y1 and Y1.
2 and the color signals Pr and Pb are arranged as shown in the figure.
On the other hand, the HDTV signal is serial digital data in the same component format as shown in FIG. 3B, but has a high speed of 1.5 Gbps. Therefore, as shown in FIGS. 3C, 3D, 3E, and 3F, 370 Mbps for each of the components Y1, Y2, Pr, and Pb
And supplied to the switch 13. It is easy for the switch 13 to have electrical characteristics that can commonly process the 270 Mbps SDTV signal and the converted 370 Mbps HDTV signal.
The configuration of the conversion circuit 14 will be described in detail with reference to FIG.

Returning to FIG. 2, in the switch 13, first S
If the DTV signal is transmitted, the combining circuit 15 to 18, it is <br/> supplied by two selected any SDTV signals, respectively. In the synthesizing circuit, the two input video signals are synthesized according to the screen effect, and output as SDTV signals to be broadcasted as outputs Os1 to Os4. Next, HDTV
When a signal is transmitted, the synthesizing circuits 15 to 18 respectively convert the components into parallel data and convert the components into Y1 and Y2.
2. Combine Pr and Pb and combine them. Therefore, in the switch 13, cross points are arranged so as to supply the component Y1 to the combining circuit 15, cross points are arranged so as to supply the component Y2 to the combining circuit 16, and the component The cross points are arranged so as to supply Pr, and the cross points are arranged in the synthesizing circuit 18 so as to supply the component Pb. Synthesis circuit 15-1
8, the components Y1, Y2, P
The signals r and Pb are then supplied to the output conversion circuit 19, where they are converted into the original 1.5 Gbps serial signal and become the transmitted HDTV signal Oh. The configuration of the synthesizing circuits 15 to 18 will be described in detail with reference to FIG. 5, and the output conversion circuit 19 will be described in detail with reference to FIG.

Referring to FIG. 4, the configuration of the input converter 14 (FIG. 2) is based on SMPTE standard 292M 1.5G.
bps serial signal is serial-parallel (S-P)
The converter 20 uses the SMPTE standard 274M 20-bit 7
The data is converted into parallel data of 4 Mz and further separated by a separation circuit 21.
Is converted into 10-bit 37 MHz data for each component. 10 for each component from the separation circuit
The bit 37 MHz data is EAV
Data and the like are added to make the signal format the same as the SDTV signal entering the switch 13. Thereafter, the parallel-serial (PS) converter 23 converts the data into serial digital data of 370 Mbps for each component.

Referring to FIG. 5, the synthesis circuit 15 (16 to 16)
In the configuration of 18), SP converters 24 and 25 for respectively converting two input serial digital data into parallel digital data, and receiving the two converted data and synthesizing the two data under the control of the control circuit 30. Multiply /
It comprises an adder circuit 26, a PS converter 27 for converting the combined signal into serial digital data again, and a control circuit 30 for controlling clock switching and screen effects. In this embodiment, the synthesizing circuit receives and synthesizes two inputs. However, in the present invention, the number of inputs is not limited to two, and the number of inputs may be increased in order to transmit a more complicated effect screen. Good. For example, when creating a composite screen that combines four independent images on a screen, four inputs are received. If the synthesizing process is unnecessary, one video signal may be passed as it is.

The control of the synthesizing circuits 15 to 18 is to control the signal synthesizing operation of each video signal synthesizing circuit for each pixel on the basis of the position of the SAV signal for each scanning line based on control information given from the outside. , One of the two input video signals is selected and output as a composite signal. In this case, as a method of selecting a video signal, for example, by replacing a part of the background video with another video, a superimposed display in which, for example, characters or the like are displayed in a color different from the background in the video is performed. Alternatively, it is possible to divide the screen at an arbitrary ratio and perform screen division display for displaying two different types of video. Further, during SDTV operation, the video signal synthesizing circuits 15 to 18 perform different signal synthesizing operations, respectively, so that the output terminals Os1, Os2, Os3,
In Os4, an SDTV signal having undergone different signal synthesis processing can be output. On the other hand, HDT
At the time of V operation, the output converter 19 combines the low-speed HDTV signals subjected to the same signal combining processing in the video signal combining circuits 3, 4, 5, and 6,
From the output terminal Oh , the HDT with the desired
A V signal can be output.

Referring to FIG. 6, the output conversion circuit 19
An SP converter 31 for converting serial digital data for each component of 370 Mbps into 10-bit 37 MHz parallel digital data, a memory circuit 32 for removing a phase difference between data for each component, and data from the memory circuit 32 Combined, 20 bits 74M
And a synthesizing circuit 33 for synthesizing the data of
And a PS conversion circuit 34 for converting data from the PC into a 1.5 Gbps serial HDTV signal. Also,
The memory circuit 32 includes a line memory 35 as shown in FIG.
And the memory 35 based on the EAV timing of the input data.
And a read controller 37 for reading the line memories 35 of all the memory circuits 32 in common. Read controller 37
In order to supply a common read timing to all the memory circuits 32 while absorbing the phase difference between the channels, a delay unit 38 is provided at the preceding stage. Delay by the added time. Since the output of the read controller 37 is supplied to all the memory circuits in common, the other memory circuits 32 do not require the read controller 37 and the delay unit 38, and only the write controller 36 is provided.

As described above, according to the configuration of the video switching / synthesizing apparatus of this example, two video images are synthesized by selecting and switching each of the SDTV signal and the HDTV signal from a plurality of input signals. In addition, a 4-channel SDTV signal or a 1-channel HDTV signal can be switched and output. At this time, 1.5
The HDTV signal having the signal rate of Gbps is divided into four by the input converters 14C1 to 14Cn and supplied to the switch 13 as output signals in units of four to perform switching. Signal rate is 3
Since the signal rate is close to that of an SDTV signal having a signal rate of 70 Mbps and 270 Mbps, there is an advantage that high-speed processing is not required and various circuits in the switch 13 and the video signal synthesizing circuits 15 to 18 can be shared.

Although the embodiment of the present invention has been described in detail with reference to the drawings, the specific configuration is not limited to this embodiment, and there are design changes and the like without departing from the gist of the present invention. Even this is included in the present invention. For example, the number of SDTV signals or HDTV signals to be synthesized is not limited to two but may be three.
Or more. Further, the method of video synthesis is not limited to the method of superimposition and screen division, and for example, it is also possible to perform fade-in or fade-out processing, or perform mosaic processing.

Although the 1125i system defined in the SMPTE standard 292M has been exemplified as the HDTV signal, the present invention is not limited to this.
Needless to say, it can be applied to the 750p system defined in the PTE standard 296M.

[0026]

As described above, according to the present invention, when performing the switching synthesis processing of the SDTV signal and the HDTV signal, the processing of the multi-channel SDTV signal and the processing of the one-channel HDTV signal are performed by one. Since the two devices are shared and executed, it is possible to realize a video switching / combining device capable of reducing the device scale.

Further, since a high-speed HDTV signal is divided into a plurality of low-speed HDTV signals and processed, a video switching / combining apparatus which does not require high-speed signal processing can be realized.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a digital broadcasting system employing a video switching / synthesizing apparatus of the present invention.

FIG. 2 is a diagram showing an embodiment of a video switching / synthesizing apparatus according to the present invention.

3A and 3B are diagrams showing a format of a signal input to the switch in FIG. 2, wherein FIG. 3A shows an SDTV signal, and FIG.
Indicates an HDTV signal, and (C), (D), (E),
(F) shows the component component of the HDTV signal converted at low speed.

FIG. 4 is a block diagram showing a configuration of the input converter of FIG. 2;

FIG. 5 is a block diagram showing a configuration of the video compositing circuit of FIG. 2;

FIG. 6 is a block diagram showing a configuration of the output converter of FIG. 2;

FIG. 7 is a block diagram illustrating a configuration of a memory circuit in FIG. 6;

FIG. 8 is a block diagram showing a configuration of a conventional video switching / synthesizing apparatus and a digital broadcasting system employing the same.

[Explanation of symbols]

 Reference Signs List 12 video switching / combining device 13 switcher (switching means) 14 input converter 15-18 video signal combining circuit (signal combining means) 19 output converter (output converting means) video switching / combining device

Claims (7)

(57) [Claims] 1. A plurality of input conversion means for dividing a plurality of digitized high-definition television (hereinafter abbreviated as HDTV) signals into a plurality of sets of low-speed HDTV signals and outputting the divided sets, respectively; Standard television (hereinafter SD)
TV) or the output of the plurality of input conversion means .
Slow switching means for performing switching so as to select by any number of sets of signals from the HDTV signal corresponding to the division number of the HDTV signal, provided corresponding to said plurality of sets of signals, each of said arbitrary number that A plurality of signal synthesizing means for synthesizing the signals, and an output converting means for synthesizing an output of each of the signal synthesizing means and outputting an HDTV signal, and a plurality of sets synthesized from the plurality of signal synthesizing means. S
A video switching / combining apparatus configured to output a DTV signal and an arbitrary number of combined HDTV signals from the output conversion unit in accordance with switching of the switching unit. 2. The video switching / synthesizing apparatus according to claim 1, wherein said SDTV signal comprises a digital component signal. 3. The video switching / synthesizing device according to claim 1, wherein the input conversion means divides the HDTV signal into low-speed HDTV signals having a signal rate close to the signal rate of the SDTV signal. 4. The video switching / combining apparatus according to claim 1, wherein said input conversion means divides the HDTV signal into four. 5. The video switching and synthesizing apparatus according to claim 4, wherein said input conversion means divides the HDTV signal into luminance signals Y1 and Y2 and color signals PR and PB. Wherein said switching means and said signal combining means, the low
Signal processing common to high- speed HDTV signals and SDTV signals
Claim 1, characterized in that it is the physical configured to be capable,
6. The video switching / synthesizing apparatus according to 2, 3, 4 or 5. 7. A plurality of input conversion means for dividing a plurality of digitized high-definition television (hereinafter abbreviated as HDTV) signals into a plurality of sets of low-speed HDTV signals and outputting the divided signals, Standard television (hereinafter SD)
TV) or the output of the plurality of input conversion means .
And switching means for switching to select a plurality of sets of signals corresponding low-speed HDTV signal division number of the HDTV signal that outputs the HDTV signal by combining the selected low speed HDTV signal from said switching means Output conversion means, wherein a plurality of sets of SDTV signals selected from the switching means and a combined HDTV signal from the output conversion means are output in accordance with switching of the switching means. A video switching / synthesizing device characterized in that it is performed.