JPH09261601A - Video signal processor serving for both standard/high definition systems - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a signal processor serving for both standard/high definition systems economically constitutable just by the video signal processor of the standard system by developing the video signals of a high transmission rate to the plural layers of the transmission rate almost the same as the video signals of a low transmission rate. SOLUTION: HDTV signals are transferred through the transmission line of the high transmission rate or the like to a layer developing device 2. DATA inputted to the layer developing device 2 are transferred to first-forth word shifters and then, transferred to fifth eighth word shifters further. The fifth- eighth word shifters are bit-shifted and output is performed from the output terminal of the layer developing device 2 to a selection switching device 4 as the layer developed data of signals such as the signals of a 1/4 clock rate or the like. On the other hand, the video signals of the low transmission rate are all transferred to the selection switching device 4 by the transmission line 11 of the low transmission rate. The selection switching device 4 selects the layer-developed HDTV signals or NTSC system signals by selection signals and outputs them from the output terminals 8-1-8-4.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to the NTSC system, P
A standard / high standard that processes the broadcast video signal of the conventional standard system such as the AL system and the video signal of a high definition television (HDTV) system, which is more than 5 times the standard system, so-called high-definition broadcast video, by the same signal processing circuit The present invention relates to a dual-purpose video signal processing device for both types.

[0002]

2. Description of the Related Art For television broadcasting, a high-definition television (HDTV) system has been developed as a so-called high-definition television, and NTSC system, P, which is a conventional standard system.
Along with the spread of the AL system and the like, it has become popular, and there is a demand for a standard / high-definition dual-purpose video signal processing device that can be used for both.

However, there is a big difference between the transmission rates of the two video signals, and in the case of serial transmission of a video signal of digital 1 word 10 bits, the conventional standard system D1 system such as NTSC system and PAL system is 270 Mbps.
(Megabits per second), the HDTV system uses 1.5 Gbps (gigabits per second) [correctly 1.4
85 Gbps], and the HDTV system requires a transmission rate five times or more that of the standard system.

As shown in FIG. 4, a conventional dual-purpose signal processing apparatus includes a signal processing apparatus 33 dedicated to the standard system and an HD.
A signal processing device 34 dedicated to the TV system is provided and is used as a signal processing device of a system selected from either of the two systems by the input / output switching devices 37 and 38,
For example, as shown in FIG. 5, a device for converting and reversely converting a video signal of one system into a video signal of the other system is provided and combined with a signal processing device of either one of the standard system and the HDTV system. It is known that both types of dual-purpose signal processing devices are used.

In the latter case, in the example shown in FIG. 5, an up converter 40 and a down converter 41 for converting / reversely converting a standard system video signal into an HDTV system video signal are provided, and a video signal input from an input terminal 31 is In the case of the HDTV system, it is directly input to the signal processing device 34 dedicated to the HDTV system without passing through the converter, and when the input video signal is the standard system, the up / down converter 40,
By converting an NTSC system video signal into an HDTV system video signal and processing it at 41, one HDTV system dedicated signal processing device 34 is used for both systems.

Further, without using an up / down converter as a signal conversion device, for example, four NTSC video signal processing devices are provided in place of one HDTV system signal processing device to perform HDTV video signal processing. At this time, it is also possible to operate these four units in parallel, and to operate these four units individually for conventional video signal processing.

In any case, the transmission line 10 reaches the HDTV signal processing device 34 from the input terminal 31 via the input switching device 37 and the output terminal 32 from the HDTV signal processing device 34 via the output switching device 38. Transmission line 10
Is a high transmission rate, and a low transmission rate is good for NT
This is a part of the transmission line 11 of the dedicated input section and output section of the SC system signal processing device 33.

[0008]

Generally, in the case of a circuit that processes a high-speed signal, it is necessary to design a transmission line according to the transmission speed of each signal, and a substrate made of a different material is used for each transmission line. There must be.

For example, when the transmission line of each system is formed of a microstrip line or a strip line,
It is necessary to design the impedance corresponding to each transmission rate, and a complicated design is required by combining the thickness of the substrate, the width and shape of the line, the dielectric constant, and the like. In particular, since the material of the substrate and other design conditions greatly change at a boundary of about 500 Mbps, using a substrate of a general material does not provide a good dielectric constant for designing a transmission line, There is a problem in that an expensive substrate is required.

Therefore, in the case of a processing circuit for both a 270 Mbps conventional type video signal and a 1.5 Gbps HDTV type video signal, an expensive material is used for a portion which is used even in the conventional type. Many complex designs are required.

An object of the present invention is to use both standard and high definition video signal processing which can be economically constructed only by the standard system video signal processing device by lowering the transmission rate of the high definition system transmission line. To provide a device.

[0012]

SUMMARY OF THE INVENTION A standard / high-definition dual-purpose video signal processing apparatus of the present invention provides a high-definition video signal in a plurality of N system layers, each of which has a transmission rate substantially equal to that of the standard system. Layer expanding means for converting, a plurality of N transmission lines each of which has a transmission rate substantially equal to the transmission rate of the standard system, and a video signal sent to each of the N transmission lines,
Selection switching means for switching to either the N-layer video signal expanded from the high definition method by the layer expansion means or the N standard video signals, and the standard video signal output from the selection switching means. And N video signal processing devices.

The layer expansion means has a transmission rate of 1.5.
High-definition video signal of Gps is transmitted at 375 Mbps of 4
It is desirable to convert to a standard system video signal.

The layer expanding means shifts the input data of the high definition video signal by one word by the high definition clock and stores the first shift register.
A clock frequency divider that divides the high-definition system clock into 1/4, and outputs the first shift register and the clock frequency divider to output four standard-system video signals. It is preferably composed of two shift registers.

[0015]

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing the construction of one embodiment of a transmission path / combined apparatus of a standard / high definition dual-purpose combined use video signal processing apparatus according to the present invention. FIG. Is a time chart of the layer developing device 2.

It should be noted that the transmission rate of HDTV video when transmitted in 10 bits per word is 148 correctly.
It is 5 Mbps, but here it is 1500 Mbps for short.
And The transmission path / combined device 1 of this embodiment has a transmission rate of 1
An input connector 5 into which a high transmission rate video signal such as a 500 Mbps HDTV video signal is input, and four input connectors 6-1 to 6-4 into which four low transmission rate video signals such as NTSC 270 Mbps are input respectively. And H
A DTV dedicated buffer 3-1, low transmission rate buffers 3-3 to 3-6, a layer expander 2 that expands HDTV signals into four layers of 375 Mbps each, and an HD expanded into four layers
A selection switch 4 for switching between a TV signal and four signals with a low transmission rate, a selection signal input terminal 7 for driving the selection switch 4, and the output of the selection switch 4 are output to the next signal processing device or the like. The output connectors 8-1 to 8-4 and the video signal processing device 9 for processing the video signals output from the output connectors 8-1 to 8-4 are included.

Further, the selection switch 4 from the input connector 5 via the HDTV-dedicated buffer 3-1 and the layer expander 2.
Is a dedicated path for HDTV signals, but a high-rate transmission path is required only between the input connector 5 and the layer expander 2, and between the layer expander 2 and the selection switch 4. Input connectors 6-1 to 6-4 to buffer 3-3
Low transmission, which is the same as the dedicated path for the video signal of the conventional system such as the NTSC system reaching the selection switch 4 through 3-6 and the shared path between the selection switch 4 and the output connectors 8-1 to 8-4. Designed as a rate transmission line.

Further, the video signals of four systems such as the NTSC system may be video signals of systems which are not related to each other, or may be video signals of one to three systems which are less than four systems. I don't care.

The number of layers to be developed is 500M for each layer.
4 if it is evenly distributed to transmission rates below bps
The number of layers is not limited to three, and may be five or more. However, it is preferable to set four layers as the number of standard systems that can be simultaneously output and the number of HDTV systems that can be developed without excess or deficiency.

Next, the operation of the standard / high definition dual type video signal processing apparatus of this embodiment will be described.

An HDTV signal having a transmission rate of 1500 Mbps input from the input connector 5 is, for example, [Pb /
Y / Pr / Y (each 10 bits)], and serial data DAT with 10 clocks per word
It is A12.

This HDTV signal is sent to the dedicated buffer 3-1.
And the data are transferred to the layer expanding device 2 via a transmission line having a high transmission rate. The DATA 12 input to the layer expander 2 is sequentially transferred to the first to fourth word shifters 19 to 22 and then further transferred to the fifth to eighth word shifters 23 by the LD signal output from the clock divider 18. ~ 26.

Fifth to eighth word shifters 23 to 26
Is a 1/4 clock rate signal from the output terminals Q1 to Q4 of the layer expander 2 that is bit-shifted by a clock obtained by dividing the main clock by 1/4, that is, a clock that is divided into 1/4.
375 Mbps for 500 Mbps HDTV signal
It is output to the selection switch 4 as layered data of s × 4 signals.

Although the layer expansion method has been shown here as an example of layer expansion in word units, it corresponds to the structure of the video signal processing device connected after the transmission line / combined device, for example, for each bit. Other methods may be used.

On the other hand, all video signals of low transmission rate such as NTSC system are input to the buffers 3-3 to 3-6 from the input connectors 6-1 to 6-4 by the transmission line of low transmission rate, and then, It is transferred to the selection switch 4.

The selection switcher 4 selects either the layer-developed HDTV signal or the NTSC system signal according to the selection signal input from the selection signal input terminal 7 and outputs it from the output terminals 8-1 to 8-4. To do. These output signals are
It has a low transmission rate of 375 Mbps or 270 Mbps, and both can be processed by the standard video signal processing device 9.

[0028]

As described above, the standard / high-definition dual-purpose video signal processing apparatus according to the present invention divides a video signal having a high transmission rate into a plurality of layers having a transmission rate similar to that of a low transmission rate video signal. The development has the effect of reducing the number of transmission paths for video signals having a high transmission rate and economically configuring a transmission path having a low transmission rate.

Further, by converting the high definition video signals into the four standard system video signals by the layer expanding means, both the standard and high definition video signals can be processed only by the low cost standard system video signal processing device. There is an effect that it is possible to configure a video signal processing device for both systems.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment of a standard / high definition dual type video signal processing apparatus of the present invention.

FIG. 2 is a configuration diagram of a layer expander 2 in FIG.

FIG. 3 is a time chart of the layer expander 2.

FIG. 4 is a block diagram of an example of a conventional standard / high definition dual type video signal processing device.

FIG. 5 is a block diagram of another example of a conventional standard / high definition dual type video signal processing device.

[Explanation of symbols]

 1 Transmission line / combined device 2 Layer expander 3-1 to 3-6 Buffer 4 Selection switcher 5, 6-1 to 6-4 Input connector 7 Selection signal input terminal 8-1 to 8-4 Output connector 9 Video signal Processor 10 High transmission rate transmission line 11 Low transmission rate transmission line 12 DATA 18 Clock divider 19-22 First to fourth word shifter 23-26 Fifth to eighth word shifter Q1 to Q4 Layer expander Output terminal

Claims (3)

[Claims] 1. A standard / high processing system for processing a plurality of N systems of video signals having a transmission rate of a conventional standard system and a video signal of a high definition system having a high transmission rate which is several times higher than the transmission rate of the standard system. In the dual definition video signal processing apparatus, layer expansion means for converting the high definition video signal into a plurality of N system layers, each of which has a transmission rate substantially equal to the standard transmission rate, and each transmission rate is substantially the same. A plurality of N transmission lines having a transmission rate equivalent to that of the standard system, and a video signal sent to each of the N transmission lines is expanded by the layer expansion means to each layer of the high definition video signal. , Or N selection switching means for switching to any of the standard format video signals, and the standard format output from the selection switching means, or
A standard / high-definition dual-purpose video signal processing device, characterized in that it has an N-system video signal processing device for processing high-definition video signals for N layers converted to almost the same transmission rate. 2. The standard and high definition both according to claim 1, further comprising layer expansion means for converting a high definition video signal having a transmission rate of 1.5 Gbps into four standard video signals of 375 Mbps. A video signal processing device that also serves as a system. 3. The layer expanding means comprises a first shift register for storing input data of a high definition video signal by shifting it word by word by a high definition clock, and the high definition clock. Is divided into 1/4 and a second shift register which inputs the outputs of the first shift register and the clock divider and outputs a video signal of four standard systems. The standard and high definition dual type video signal processing device according to claim 2.