CN102523418B - Interface converting device, video signal converting method and audio/video equipment - Google Patents
Interface converting device, video signal converting method and audio/video equipment Download PDFInfo
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- CN102523418B CN102523418B CN201110448468.3A CN201110448468A CN102523418B CN 102523418 B CN102523418 B CN 102523418B CN 201110448468 A CN201110448468 A CN 201110448468A CN 102523418 B CN102523418 B CN 102523418B
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Abstract
The invention belongs to the field of audio/video and provides an interface converting device, a video signal converting method and audio/video equipment. The interface converting device comprises a video data recovering module, an auxiliary data inserting module and an SDI (Standard Data Interface) interface module; the video data recovering module is used for recovering video signals with different data formats into 24-bit video signals; the auxiliary data inserting module is used for sampling the 24-bit video signals to generate 20-bit video signals and inserting external auxiliary data into the 20-bit video signals according to a flag bit of a hidden blanking interval; and the SDI interface module is used for carrying out parallel/serial conversion on the 20-bit video signals and inserting clock information into the 20-bit video signals to be output. According to the embodiment of the invention, the interface converting device can be used for carrying out self-adaptive adjustment and carrying out the conversion of an SDI interface when the sampling rate and the resolution ratio of input parallel video signals are changed, a converting chip does not need to be reconfigured and attributes of the video signals do not need to be manually switched; and the operation is simple and convenient.
Description
Technical field
The invention belongs to audio frequency and video field, relate in particular to a kind of interface switching device, video signal conversion method and audio & video equipment.
Background technology
In the studio of TV station, between various presentation facility, transmit that audio-video signal realizes by SDI (Serial Digital Interface, digital serial interface) bus often, and the SDI interface equipment of 270M SD is conventional especially.But, in the time of application SDI interface equipment, need to there is fixing requirement to sampling ratio and the resolution of the vision signal of input, when the sampling of incoming video signal than and resolution while changing, need to be by the artificial presentation facility conversion chip of resetting that arranges, can receive new sampling than and the vision signal of resolution.
Summary of the invention
The object of the embodiment of the present invention is to provide a kind of interface switching device, thus be intended to solve in prior art when the sampling of incoming video signal than and resolution need to cause using by artificial change setting the problem of inconvenient operation while changing.
The embodiment of the present invention is achieved in that a kind of interface switching device, comprising:
Video data recovery module, is reduced into the vision signal of different data format the vision signal output of 24bit;
Auxiliary data insert module, the vision signal sampling of described 24bit is generated to the vision signal of 20bit, according to the marker bit of row vertical blanking period, outside auxiliary data is inserted in the vision signal of described 20bit, output row vertical blanking period has the vision signal of the 20bit of auxiliary data;
SDI interface module, carries out parallel-serial conversion by the vision signal of the 20bit of described auxiliary data insert module output, and the vision signal that clock information is inserted into described 20bit is for output.
Further, described auxiliary data insert module comprises:
Blanking interval is searched unit, searches the blanking interval of the vision signal of described 24bit;
Marker bit generation unit, the output of searching unit according to described blanking interval generates the marker bit of row vertical blanking period;
Sampling of data unit, samples the vision signal of described 24bit and generates the vision signal of 20bit;
Auxiliary data input unit, is inserted into the described auxiliary data of outside according to the described marker bit of described marker bit generation unit output in the vision signal of described 20bit of described sampling of data unit output for output.
Further, the vision signal of described different data format comprises: the vision signal that the vision signal that clock frequency is 108MHZ, the vision signal that clock frequency is 74.25MHZ and clock frequency are 27MHZ.
Further, described vision signal comprises: 16bit Y:C
b: C
rthe signal of=4:4:4,16bitY:C
b: C
rthe signal of=4:2:2 or 8bitY:C
b: C
rthe signal of=4:2:2; Described Y represents luminance component, described C
brepresent chroma blue component, described C
rrepresent red color component.
The object of the embodiment of the present invention is also to provide a kind of video signal conversion method, comprises the steps:
S1: the vision signal that the vision signal of different data format is reduced into 24bit is used for next stage;
S2: outside auxiliary data is inserted in the vision signal of described 24bit, output row vertical blanking period has the vision signal of the 20bit of auxiliary data;
S3: the vision signal of described 20bit is carried out to parallel-serial conversion, and the vision signal that clock information is inserted into described 20bit is for output.
Further, described step S2 further comprises:
Search the blanking interval of the vision signal of described 24bit;
Generate the marker bit of row vertical blanking period according to described blanking interval;
The vision signal of described 24bit is sampled and generate the vision signal of 20bit;
According to described marker bit, the described auxiliary data of outside is inserted in the vision signal of described 20bit for output.
Further, the vision signal of described different data format comprises: the vision signal that the vision signal that clock frequency is 108MHZ, the vision signal that clock frequency is 74.25MHZ and clock frequency are 27MHZ.
Further, described vision signal comprises: 16bit Y:C
b: C
rthe signal of=4:4:4,16bitY:C
b: C
rthe signal of=4:2:2 or 8bitY:C
b: C
rthe signal of=4:2:2; Described Y represents luminance component, described C
brepresent chroma blue component, described C
rrepresent red color component.
The object of the embodiment of the present invention is also to provide a kind of audio & video equipment that comprises above-mentioned interface switching device.
In embodiments of the present invention, interface switching device is reduced into the vision signal of different data format the vision signal of 24bit, the vision signal sampling of 24bit is generated to the vision signal of 20bit, outside auxiliary data is inserted in the vision signal of 20bit according to the marker bit of row vertical blanking period, clock information is inserted into the vision signal of 20bit for output simultaneously; Realize the parallel YC in input
bc
rthe sampling of vision signal than and the adjustment of resolution adaptivity while changing carry out the conversion of SDI interface, without replacement conversion chip, without the artificial attribute of Switch Video signal; Simple to operation.
Accompanying drawing explanation
Fig. 1 is the modular structure schematic diagram of the interface switching device that provides of the embodiment of the present invention;
Fig. 2 is the structured flowchart of auxiliary data insert module in the interface switching device that provides of the embodiment of the present invention;
Fig. 3 is the schematic diagram of input signal in the interface switching device that provides of the embodiment of the present invention;
Fig. 3 A is 8 bit Y:C
b: C
rthe vision signal schematic diagram of=4:2:2;
Fig. 3 B is 16 bit Y:C
b: C
rthe vision signal schematic diagram of=4:4:4;
Fig. 3 C is 16 bit Y:C
b: C
rthe vision signal schematic diagram of=4:2:2;
Fig. 3 D is the vision signal schematic diagram of 24 bits;
Wherein, Y represents luminance component, C
brepresent chroma blue component, C
rrepresent red color component.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
The interface switching device that the embodiment of the present invention provides can be applied in the audio & video equipment such as radio and television, Set Top Box, can also be applied to the fields such as engineering machine.Fig. 1 shows the modular structure of this interface switching device; For convenience of explanation, only show the part relevant to the embodiment of the present invention, details are as follows:
Interface switching device comprises: the video data recovery module 1, auxiliary data insert module 2 and the SDI interface module 3 that connect successively; Wherein video data recovery module 1 is reduced into the vision signal of different data format the vision signal output of 24bit; The vision signal sampling of auxiliary data insert module 2 24bit that just video data recovery module 1 is exported generates the vision signal of 20bit, according to the marker bit of row vertical blanking period, outside auxiliary data is inserted in the vision signal of 20bit, output row vertical blanking period has the vision signal of the 20bit of auxiliary data; Output row vertical blanking period has the vision signal of the 20bit of auxiliary data; The vision signal of the 20bit that SDI interface module 3 is exported auxiliary data insert module 2 is carried out parallel-serial conversion, and the vision signal that clock information is inserted into 20bit is for output.
In the embodiment of the present invention, video data recovery module 1 is reduced into the video data of different bit wides the data of same bit-width (24bit), then sends to rear coagulation; Auxiliary data insert module 2 is being inserted in the row vertical blanking period of video as data such as audio frequency, then out be exactly the vision signal that row vertical blanking period has the auxiliary datas such as audio frequency, and then this vision signal is put on SDI interface sending module and is sent.Original input signal can be the data message of 24 bits.As parallel YC
bc
rsignal (such as: YC
bc
r=4:4:4,720P) (suppose to change into YC while changing
bc
r=4:2:2,1080I), studio staff does the switching of input signal attribute without going to operate SDI conversion equipment, and automatically there is setup of attribute and switch in this equipment.
In embodiments of the present invention, auxiliary data insert module 2 further comprises: blanking interval is searched unit 21, sampling of data unit 22, marker bit generation unit 23 and auxiliary data input unit 24; Wherein blanking interval is searched unit 21 and is searched the blanking interval of the vision signal of 24bit; Marker bit generation unit 23 is searched the marker bit of the output generation row vertical blanking period of unit 21 according to blanking interval; Sample the vision signal of 24bit and generate the vision signal of 20bit in sampling of data unit 22; Auxiliary data input unit 24 is inserted into outside auxiliary data according to the marker bit of marker bit generation unit output in the vision signal of the 20bit exporting sampling of data unit 22 for output.
The embodiment of the present invention also provides a kind of video signal conversion method, comprises the steps:
S1: the vision signal of different data format is reduced into the vision signal output of 24bit; Particularly, the clock frequency difference of sending according to above-mentioned several data form, judges it is the video data of that a kind of form, has known it is after any video data, the video data that just vision signal of this data format can be reduced into 24bit, uses for next stage;
S2: outside auxiliary data is inserted in the vision signal of 24bit, output row vertical blanking period has the vision signal of the 20bit of auxiliary data;
S3: the vision signal of 20bit is carried out to parallel-serial conversion, and the vision signal that clock information is inserted into 20bit is for output.
Wherein, step S2 further comprises:
S21: the blanking interval of searching the vision signal of 24bit;
S22: the marker bit that generates row vertical blanking period according to blanking interval;
S23: the vision signal of 24bit is sampled and generate the vision signal of 20bit;
S24: according to marker bit, the described auxiliary data of outside is inserted in the vision signal of 20bit for output.
The video signal conversion method that the embodiment of the present invention provides is a set of YC that can self-adaptive parallel inputs multiple resolution
bc
rsignal is by its sampling and convert the chip-scale algorithm of the SD 270M SDI bus signals of serial to; After applied video signal conversion method, as the parallel YC of input
bc
rwhen the sampling ratio of vision signal and resolution changing, without replacement conversion chip, can be automatically by this YC
bc
rvision signal is carried out the conversion of SDI interface, has saved the operation of artificial Switch Video signal attribute in operating equipment.
Fig. 3 shows the sampling ratio between luminance component, chroma blue component and red color component in the vision signal of input; Wherein Fig. 3 A represents 8 bit Y:C
b: C
rthe vision signal of=4:2:2; Fig. 3 B is expressed as 16 bit Y:C
b: C
rthe vision signal of=4:4:4; Fig. 3 C represents 16 bit Y:C
b: C
rthe vision signal of=4:2:2; Fig. 3 D represents the vision signal of 24 bits; Y represents luminance component, C
brepresent chroma blue component, C
rrepresent red color component; The C and 4:2:2 only samples 2 times while representing to sample 4 Y-signals
bsignal and 2 C
rsignal, therefore, C
bsignal and C
rthe precision of signal is just low one times than Y-signal, but because human eye is insensitive to colourity, more responsive to brightness, so this compression is also acceptable.As DVI (Digital Visual Interface, digital visual interface) signal is while entering video data recovery module 1, the bit wide of input signal can be two kinds of 8 bits and 16 bits, and the clock frequency of input signal can be tri-kinds of 27MHZ, 108MHZ or 74.25MHZ.
In embodiments of the present invention, determine attribute information (comprising bit wide etc.) and the configuration methods of sampling of signal according to the signal clock frequency detecting, and be reduced into the initial data of 24, and producing initial data clock, initial data is the YC of 24 bits of standard
bc
rvision signal.Wherein YC
bc
rbe more conventional color-code scheme in the consumer video products such as DVD, video camera, Digital Television, Y refers to luminance component, C
brefer to chroma blue component, C
rrefer to red color component; People's naked eyes are more responsive to the Y component of video, therefore reducing after chromatic component by chromatic component is carried out to sub sampling, and naked eyes are by the variation of imperceptible picture quality; Main sub sampling form has YC
bc
r=4:2:0, YC
bc
r=4:2:2 and YC
bc
r=4:4:4; Wherein 4:2:0 represents that every 4 pixels have 4 luminance components, 2 chromatic components, and the odd-numbered scan lines of only sampling, is portable video apparatus (MPEG-4) and the most frequently used form of video conference (H.263); 4:2:2 represents that every 4 pixels have 4 luminance components, and 4 chromatic components, are the most frequently used forms of DVD, Digital Television, HDTV and other consumer video equipment; 4:4:4 represents both full-pixel dot matrix, for high-quality video application, studio and professional video product.
In embodiments of the present invention, interface switching device is reduced into the vision signal of different data format the vision signal of 24bit, the vision signal sampling of 24bit is generated to the vision signal of 20bit, outside auxiliary data is inserted in the vision signal of 20bit according to the marker bit of row vertical blanking period, clock information is inserted into the vision signal of 20bit for output simultaneously; Realize the parallel YC in input
bc
rthe sampling of vision signal than and the adjustment of resolution adaptivity while changing carry out the conversion of SDI interface, without replacement conversion chip, without the artificial attribute of Switch Video signal; Simple to operation.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any modifications of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in protection scope of the present invention.
Claims (7)
1. an interface switching device, is characterized in that, comprising:
Video data recovery module, is reduced into the vision signal of different data format the vision signal output of 24bit;
Auxiliary data insert module, the vision signal sampling of described 24bit is generated to the vision signal of 20bit, according to the marker bit of row vertical blanking period, outside auxiliary data is inserted in the vision signal of described 20bit, output row vertical blanking period has the vision signal of the 20bit of auxiliary data;
SDI interface module, carries out parallel-serial conversion by the vision signal of the 20bit of described auxiliary data insert module output, and the vision signal that clock information is inserted into described 20bit is for output;
Described auxiliary data insert module comprises:
Blanking interval is searched unit, searches the blanking interval of the vision signal of described 24bit;
Marker bit generation unit, the output of searching unit according to described blanking interval generates the marker bit of row vertical blanking period;
Sampling of data unit, samples the vision signal of described 24bit and generates the vision signal of 20bit;
Auxiliary data input unit, is inserted into the described auxiliary data of outside according to the described marker bit of described marker bit generation unit output in the vision signal of described 20bit of described sampling of data unit output for output.
2. interface switching device as claimed in claim 1, is characterized in that, the vision signal of described different data format comprises:
Clock frequency is the vision signal that the vision signal of 108MHZ, vision signal that clock frequency is 74.25MHZ and clock frequency are 27MHZ.
3. interface switching device as claimed in claim 2, is characterized in that, described vision signal comprises: 16bitY:C
b: C
rthe signal of=4:4:4,16bitY:C
b: C
rthe signal of=4:2:2 or 8bitY:C
b: C
rthe signal of=4:2:2; Described Y represents luminance component, described C
brepresent chroma blue component, described C
rrepresent red color component.
4. a video signal conversion method, is characterized in that, comprises the steps:
S1: the vision signal of different data format is reduced into the vision signal output of 24bit;
S2: outside auxiliary data is inserted in the vision signal of described 24bit, output row vertical blanking period has the vision signal of the 20bit of auxiliary data;
S3: the vision signal of described 20bit is carried out to parallel-serial conversion, and the vision signal that clock information is inserted into described 20bit is for output;
Described step S2 further comprises:
Search the blanking interval of the vision signal of described 24bit;
Generate the marker bit of row vertical blanking period according to described blanking interval;
The vision signal of described 24bit is sampled and generate the vision signal of 20bit;
According to described marker bit, the described auxiliary data of outside is inserted in the vision signal of described 20bit for output.
5. method as claimed in claim 4, is characterized in that, the vision signal of described different data format comprises:
Clock frequency is the vision signal that the vision signal of 108MHZ, vision signal that clock frequency is 74.25MHZ and clock frequency are 27MHZ.
6. method as claimed in claim 4, is characterized in that, described vision signal comprises: 16bitY:C
b: C
rthe signal of=4:4:4,16bitY:C
b: C
rthe signal of=4:2:2 or 8bitY:C
b: C
rthe signal of=4:2:2; Described Y represents luminance component, described C
brepresent chroma blue component, described C
rrepresent red color component.
7. one kind comprises the audio & video equipment of the interface switching device described in claim 1-3 any one.
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| CN101291410A (en) * | 2007-04-20 | 2008-10-22 | 恩益禧电子股份有限公司 | Video signal processing apparatus and re-sampling apparatus |
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| CN101068366A (en) * | 2007-06-05 | 2007-11-07 | 南京大学 | H.264 based multichannel video transcoding multiplexing method and multiplexer |
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