CN104410848A - Method and apparatus for trasmitting and receiving video signal - Google Patents
Method and apparatus for trasmitting and receiving video signal Download PDFInfo
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- CN104410848A CN104410848A CN201410741965.6A CN201410741965A CN104410848A CN 104410848 A CN104410848 A CN 104410848A CN 201410741965 A CN201410741965 A CN 201410741965A CN 104410848 A CN104410848 A CN 104410848A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/77—Circuits for processing the brightness signal and the chrominance signal relative to each other, e.g. adjusting the phase of the brightness signal relative to the colour signal, correcting differential gain or differential phase
- H04N9/78—Circuits for processing the brightness signal and the chrominance signal relative to each other, e.g. adjusting the phase of the brightness signal relative to the colour signal, correcting differential gain or differential phase for separating the brightness signal or the chrominance signal from the colour television signal, e.g. using comb filter
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
- H04N5/455—Demodulation-circuits
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/12—Systems in which the television signal is transmitted via one channel or a plurality of parallel channels, the bandwidth of each channel being less than the bandwidth of the television signal
- H04N7/127—Systems in which different parts of the picture signal frequency band are individually processed, e.g. suppressed, transposed
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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Processing Of Color Television Signals (AREA)
Abstract
A method and an apparatus for transmitting and receiving a video signal are provided. A digital video signal can be modulated by using sub-carriers. At this time, the modulated video signal can include a luminance frequency signal and a modulated color difference frequency signal. A method and an apparatus for transmitting a video signal can transmit the modulated video signal. A method and an apparatus for receiving a video signal receive the modulated video signal and can demodulate the modulated video signal.
Description
Technical field
The present embodiment relates to a kind of transmission and receives the method and apparatus of picture signal, particularly, relates to a kind of method and apparatus utilizing subcarrier to transmit and receive picture signal.
Technical background
The method of transmitting image comprises the method using open circuit (open circuit) and the method using closed circuit (closedcircuit).The method utilizing open circuit is to not specific multiple user's image signal transmission, therefore in order to transmitting image uses standardized method.Contrary with it, utilize closed circuit come the method for transmitting image, due to only to specific user's image signal transmission, therefore, only have specific user to know the mode of image signal transmission.
Generally, the composite signal (composite signal) used in closed-circuit system is according to the standard mode of simulation color TV.Because standard mode uses the frequency band of restriction, the problem that color intersects and brightness (luminance) mixes therefore may be there is.
KR published patent 10-2006-0063723 discloses a kind of invention of the transmission means about image signal processing apparatus and picture signal in (publication date on December 5th, 2005).Open invention is applicable to the picture signal expression etc. of NTSC mode, effectively avoids factitious edge to represent, and is effectively located in the higher picture signal of reason frame rate by easy formation.In the disclosure invention, the median on the time shaft in color difference signal frame is set as closest to the median on the time shaft in multiple frames of corresponding luminance signal, thus color difference signal frame is distributed to multiple frames of luminance signal.
Summary of the invention
Technical task
A kind of device and method for transmitting modulated picture signal is provided according to an embodiment.
A kind of device and method for receiving modulated picture signal is provided according to an embodiment.
Technical scheme
According to a side, image signal transmission method, comprises the following steps: digital type image Signal separator is become luminance signal and color difference signal; Described luminance signal is converted to the luminance frequency signal with the 1st frequency band, and described color difference signal is converted to the aberration frequency signal with the 2nd frequency band; Utilize subcarrier to modulate described aberration frequency signal, make described aberration frequency signal have the 3rd frequency band; Utilize the aberration frequency signal of described luminance frequency signal and described modulation, generate the modulated image signal that described picture signal is modulated; And transmit described modulated image signal.
Described image signal transmission method, can be further comprising the steps: receive described digital type image signal from closed-circuit system (closedcircuit system).
The step of described generation, can be by multiplexed for the aberration frequency signal of described luminance frequency signal and described modulation, generate described modulated image signal.
The step of described conversion, is utilize luminance filter to convert described luminance signal to described luminance frequency signal, and utilizes aberration filter to convert described color difference signal to described aberration frequency signal.
Described image signal transmission method, can be further comprising the steps: convert described modulated image signal to analog picture signal
Transmitting the step of described modulated image signal, can be the described analog picture signal of transmission.
The step of described separation can be that described digital type image Signal separator is become described luminance signal, described color difference signal and timing signal.
The step of described generation, can be utilize described luminance frequency signal, the aberration frequency signal of described modulation and described timing signal, generate described modulated image signal.
Described timing signal can be the synchronous signal about described analog picture signal.
Described timing signal can comprise at least one in the vertical synchronization of described analog picture signal and horizontal synchronization.
Described modulated image signal can make described 1st frequency band and described 3rd frequency band not overlapping.
Described modulated image signal can be, the frequency band being spaced apart regulation between described 1st frequency band and described 3rd frequency band
The frequency of described subcarrier, is set by utilizing frequency interleaving (frequency interleaving).
The frequency of described subcarrier can be more than 4.43MHz.
According to another side, image signal transmission apparatus, comprise: processing unit, digital type image Signal separator is become luminance signal and color difference signal, and described luminance signal is converted to the luminance frequency signal with the 1st frequency band, and described color difference signal is converted to the aberration frequency signal with the 2nd frequency band, subcarrier is utilized to carry out modulating (modulation), described aberration frequency signal is made to have the 3rd frequency band, and utilize the aberration frequency signal of described luminance frequency signal and described modulation, generate the modulated image signal that described picture signal is modulated; And communication unit, transmit described modulated image signal.
According to another side again, picture signal method of reseptance comprises the following steps: receive analog picture signal; Convert described analog picture signal to digital signal; Utilize subcarrier, described digital signal is separated into brightness (luminance) signal and color difference signal; And utilize described luminance signal and described color difference signal, generate digital type image signal.
Technique effect
A kind of device and method can be provided, modulation digital formula picture signal, thus the modulated image signal that transmission generates.
A kind of device and method can be provided, receive modulated image signal, and by receive modulated image signal demodulation thus restored image signal.
Accompanying drawing explanation
Fig. 1 is the diagram illustrated according to the transmission of an example and the system of reception picture signal.
Fig. 2 is the structure chart of the device of the image signal transmission illustrated according to an example.
Fig. 3 is the flow chart of the method for the image signal transmission illustrated according to an example.
Fig. 4 is the diagram of the luminance filter illustrated according to an example.
Fig. 5 is the diagram of the aberration filter illustrated according to an example.
Fig. 6 is the diagram of the modulated aberration frequency signal illustrated according to an example.
Fig. 7 is the diagram of the modulated image signal illustrated according to an example.
Fig. 8 is the diagram of the modulated image signal illustrated according to an example.
Fig. 9 is the structure chart of the processing unit illustrated according to an example.
Figure 10 is the structure chart of the device of the reception picture signal illustrated according to an embodiment.
Figure 11 is the flow chart of the method for the reception picture signal illustrated according to an embodiment.
Figure 12 is the structure chart of the processing unit illustrated according to an example.
Embodiment
Below, with reference to accompanying drawing, embodiment is described in detail.Identical reference marks shown in each accompanying drawing represents identical parts.
The embodiment below illustrated can carry out multiple change.The embodiment below illustrated is not limited to example, should be understood that the institute about this embodiment changes and can comprise coordinate even substitute.
The technical terms used in embodiment, only for illustration of specific embodiment, is not used for limiting embodiment.The performance using odd number is to make sentence more clear, and it also comprises the meaning of plural number.In this manual, " comprise " or the term such as " having " represent specification is recorded feature, numeral, step, operation, inscape, parts or combinations thereof existence, but should understand, do not get rid of other features one or more, or numeral, step, operation, inscape, the existence of parts or combinations thereof or additional possibility.
Unless otherwise defined, comprise all terms of technical or scientific term as used herein, with the those of ordinary skill belonging to the art general understood there is the identical meaning.The term defined in normally used dictionary, be interpreted as with correlation technique context on have equivalent in meaning, except non-invention defines especially, should not be construed as the meaning with other or too formality.
In addition, when being described with reference to accompanying drawing, parts identical in reference numeral have identical reference marks, and to this, the repetitive description thereof will be omitted.When being described embodiment, when relevant known technology illustrate be judged as make the embodiment of explanation smudgy time, this detailed description can be omitted.
Fig. 1 is the diagram illustrated according to the transmission of an example and the system of reception picture signal.
System 100 (being called system 100 for short for the system transmitted and receive picture signal below) for transmitting and receive picture signal can comprise video modulator 110 and visual demodulator 120.
According to a side, system 100 can receive the original paper of digital picture.Such as, video modulator 110 can receive digital type image signal from closed-circuit system.
According to a side, system 100 can be comprised in closed-circuit system.That is, system 100 can be the whole or a part of of closed-circuit system.
Closed-circuit system is different from open circuit (opencircuit) system transmitting and receive picture signal for not specific multiple user, can pass on picture signal for specific object to specific user.
The composite signal (composite signal) used in closed-circuit system can be the standard mode of simulation color TV.
Be described referring to table 1 pair standard mode.
[table 1]
| Mode | NTSC | PAL |
| Channel width (MHz) | 6 | 6～8 |
| Vision bandwidth (brightness) | 4.2 | 4.2～5.5 |
| Vision bandwidth (aberration) | I(1.5),Q(0.5) | U(1.3),V(1.3) |
| Color subcarrier (MHz) | 3.57954545 | 4.43 |
Such as, standard mode can comprise National Television System Committee NTSC (National TelevisionSystem Committee), the line PAL that alternates (Phase Alternating Line) and store colour TV system SECAM (sequential color with memory) in proper order.
Standard mode is aberration (color difference) signal and brightness (luminance; Y) signal can use identical frequency band.When color difference signal and luminance signal use identical frequency band, demodulated image may cause color intersection problems demodulated luminance signal being become color difference signal, or color difference signal is demodulated to the brightness mixed questions of luminance signal.
Below, with reference to Fig. 2 to Fig. 9, the method for transmission of digital formula picture signal is described in detail.
Fig. 2 is the structure chart of the device of the image signal transmission illustrated according to an example.
Below, " video modulator 110 " and " image signal transmission apparatus 110 " can be used as the identical meaning, and can replace mutually.
Image signal transmission apparatus 110 can comprise communication unit 210, processing unit 220, memory 230.
Communication unit 210 can transmit and receive picture signal.
Processing unit 220 can process the picture signal that communication unit 210 receives.
Memory 230 can the picture signal that receives of storing communication unit 210, and the picture signal handled by storage processing unit 220.
Below, with reference to Fig. 3 to Fig. 9, communication unit 210, processing unit 220 and memory 230 are described in detail.
Owing to can be in statu quo suitable for above with reference to the technical content illustrated by Fig. 1, below omit detailed description.
Fig. 3 is the flow chart of the method for the image signal transmission illustrated according to an example.
In the step 310, communication unit 210 can receive picture signal.Picture signal can be numeral or analog picture signal.
According to a side, communication unit 210 can receive digital type image signal from closed-circuit system.
In step 320, digital type image Signal separator can be become luminance signal and color difference signal by processing unit 220.
According to a side, digital type image Signal separator can be become luminance signal, color difference signal and timing (timing) signal by processing unit 220.
When digital type image signal is converted into analog picture signal, timing signal can be the signal of synchronous (sync) about analog picture signal.Timing signal can be synchronization signal.Timing signal can comprise at least one in the vertical synchronization of analog picture signal and horizontal synchronization.
In a step 330, luminance signal can be converted to luminance frequency signal by processing unit 220.The luminance frequency signal be converted can have the 1st frequency band.
According to a side, processing unit 220 can use luminance filter to convert luminance signal to luminance frequency signal.For luminance filter, be described in detail with reference to Fig. 4.
In step 340, processing unit 220 can convert color difference signal to aberration frequency signal.The aberration frequency signal be converted can have the 2nd frequency band.
According to a side, processing unit 220 can use aberration filter to convert color difference signal to aberration frequency signal.For aberration filter, be described in detail with reference to Fig. 5.
Although in figure 3, illustrate and perform step 340 after performing step 330, step 330 and step 340 also can executed in parallel.
In step 350, processing unit 220 can utilize subcarrier (sub-carrier) to modulate (modulation) aberration frequency signal.Such as, processing unit 220 can utilize subcarrier can modulate aberration frequency signal, makes aberration frequency signal have the 3rd frequency band.When modulated aberration frequency signal has the 3rd frequency band, the frequency of subcarrier can be the intermediate frequency of the 2nd frequency band.Such as, when the 3rd frequency band is 11-13MHz, the frequency of subcarrier can be 12MHz.
The frequency of subcarrier is set by utilizing frequency interleaving (frequency interleaving).The frequency setting of subcarrier is the odd number multiple of 1/2 of image level frequency by frequency interleaving, and therefore, aberration frequency signal and luminance frequency signal do not interfere with one another.
For the aberration frequency signal of modulation, be described in detail hereinafter with reference to Fig. 6.
In step 360, processing unit 220 can utilize the aberration frequency signal of luminance frequency signal and modulation, generates modulated image signal.Such as, processing unit 220 can utilize luminance frequency signal, the aberration frequency signal of modulation and timing signal, generates modulated image signal.
The timing signal used in the generation of modulated image signal can comprise: at least one signal in the vertical reference signal of analog picture signal and horizontal reference signal.
According to a side, processing unit 220 by the color difference signal multiplexed (multiplexing) of luminance frequency signal and modulation, thus can generate modulated image signal.
For modulated image signal, be described in detail hereinafter with reference to Fig. 7 and Fig. 8.
In step 370, processing unit 220 can convert modulated image signal to analog picture signal.
In step 380, modulated image signal can transfer in receiver by communication unit 210.Receiver can be receive modulated image signal, by the device that picture signal is restored.
According to a side, communication unit 210 can by analog image signal transmission in receiver.Such as, can use in the transmission of analog picture signal closed circuit.That is, uniline is utilized in the transmission of analog picture signal.
By step 320 to 370, the frequency band of picture signal is expanded.Frequency due to luminance frequency signal and aberration frequency signal intersects and is reduced, and therefore, luminance signal can be made easier with being separated of color difference signal.Because color intersection problems and brightness mixed questions are reduced, therefore, the quality of restored image can be improved.
May not be performed by general display unit to the modulated image signal that 370 generate by step 320.Because modulated image signal is not performed by general display unit, therefore, have except specific user, other users can not watch the effect of image.
According to a side, the present invention can have frequecy characteristic as described in Table 2.
[table 2]
| Mode | Value |
| Channel width (MHz) | System frequency |
| Vision bandwidth (brightness) | More than 10MHz (changing) |
| Vision bandwidth (aberration) | 1.5MHz (changing) |
| Color subcarrier (MHz) | More than 4.43MHz (changing) |
The user of system 100 can change the frequecy characteristic used according to the purpose of design of system 100.
In statu quo can be suitable for above with reference to the technical content illustrated by Fig. 1 to Fig. 2, below be omitted detailed description.
Fig. 4 is the diagram of the luminance filter illustrated according to an example.
Luminance frequency signal separated in picture signal can be generated based on luminance signal.Luminance frequency signal separated in picture signal can be present in the whole region of frequency.
Luminance frequency signal separated in picture signal can be converted to the luminance frequency signal with the 1st frequency band by luminance filter 410.Such as, luminance filter 410 can be low pass (low pass) filter the 1st frequency possessed as cut-off (cut-off) frequency.1st frequency may be larger than the channel width of standard mode.Such as, the 1st frequency can be 10MHz or more than 10MHz.
In statu quo can be suitable for above with reference to the technical content illustrated by Fig. 1 to Fig. 3, below be omitted detailed description.
Fig. 5 is the diagram of the aberration filter illustrated according to an example.
Aberration frequency signal separated in picture signal can be generated based on color difference signal.Aberration frequency signal separated in picture signal can be present in the whole region of frequency.
Aberration frequency signal separated in picture signal can be converted to the aberration frequency signal with the 2nd frequency band by aberration filter 510.Such as, aberration filter 510 can be the low pass filter the 2nd frequency possessed as cut-off frequency.2nd frequency may be less than the 1st frequency.Such as, the 2nd frequency can be below 2MHz.
In statu quo can be suitable for above with reference to the technical content illustrated by Fig. 1 to Fig. 4, below be omitted detailed description.
Fig. 6 is the diagram of the modulated aberration frequency signal illustrated according to an example.
The aberration frequency signal 610 of modulation can have the 3rd frequency band.
According to a side, the size of the 3rd frequency band can be 2 times of the 2nd frequency band size.
When the size of the 3rd frequency band is 2 times of the 2nd frequency band size, the 3rd frequency band can be that a frequency is to b frequency.A frequency and b frequency are calculated by following [formula 1].
[formula 1]
Frequency-2 frequency of a frequency=subcarrier
Frequency+the 2 frequency of b frequency=subcarrier
According to another side, the large I of the 3rd frequency band is identical with the size of the 2nd frequency band.
When the size of 3 frequency bands is identical with the size of the 2nd frequency band, the 3rd frequency band can be that c frequency is to d frequency.C frequency and d frequency are calculated by following [formula 2].
[formula 2]
Frequency-2 frequency/2 of c frequency=subcarrier
Frequency+the 2 frequency/2 of d frequency=subcarrier
In statu quo can be suitable for above with reference to the technical content illustrated by Fig. 1 to Fig. 5, below be omitted detailed description.
Fig. 7 is the diagram of the modulated image signal illustrated according to an example.
Processing unit 220 by multiplexed for the aberration frequency signal 610 of luminance frequency signal 705 and modulation, thus can generate modulated image signal 710.The modulated image signal 710 generated can comprise the aberration frequency signal 610 of luminance frequency signal 705 and modulation.
According to a side, modulated image signal 710 can not make the aberration frequency signal 610 of luminance frequency signal 705 and modulation overlapping.Namely.1st frequency band and the 3rd frequency band not overlapping.
Modulated image signal 710 can be the frequency band being spaced apart regulation between the 1st frequency band and the 3rd frequency band, that is, modulated image signal 710 can comprise the allocated frequency band not having signal.Fixed frequency band can be guard band (guard band).
Pass through fixed frequency band and can reduce color intersection problems and brightness mixed questions.
In statu quo can be suitable for above with reference to the technical content illustrated by Fig. 1 to Fig. 6, below be omitted detailed description.
Fig. 8 is the diagram of the modulated image signal illustrated according to an example.
The modulated image signal 810 that treated unit 220 generates can comprise the aberration frequency signal 610 of luminance frequency signal 705 and modulation.
According to a side, the peak frequency of the 3rd frequency band can be less than the 1st frequency.That is, the 3rd frequency band can be comprised in the 1st frequency band.
When the 3rd frequency band is comprised in the 1st frequency band, when the frequency of subcarrier is higher, compared with standard mode, color intersection problems and brightness mixed questions can be reduced.
In statu quo can be suitable for above with reference to the technical content illustrated by Fig. 1 to Fig. 7, below be omitted detailed description.
Fig. 9 is the structure chart of the processing unit illustrated according to an example.
Processing unit 220 can comprise: at least one in demultiplexer, synchronous maker, luminance filter, aberration filter, subcarrier generator, modulator, digital analog converter.
Demultiplexer, synchronous maker, luminance filter, aberration filter, subcarrier generator, modulator, digital analog converter are embodied by physical property device or software respectively.
Digital type image Signal separator can be become luminance signal, color difference signal and timing signal by demultiplexer.
Synchronous maker can generate vertical reference signal and horizontal reference signal, makes timing signal can comprise vertical reference signal and the horizontal reference signal of analog picture signal.
Luminance filter and aberration filter can be respectively above-mentioned luminance filter 410 and aberration filter 510.
Subcarrier generator can make above-mentioned subcarrier occur.
Modulator can utilize subcarrier to modulate aberration frequency signal, thus generates the aberration frequency signal 610 of modulation.
Digital analog converter can convert modulated image signal to analog picture signal.
In statu quo can be suitable for above with reference to the technical content illustrated by Fig. 1 to Fig. 8, below be omitted detailed description.
Figure 10 is the structure chart of the device of the reception picture signal illustrated according to an embodiment.
Above-mentioned visual demodulator 120 can receive picture signal.Visual demodulator 120 is the receiver described in reference Fig. 3.
Visual demodulator 120 can comprise communication unit 1010, processing unit 1020 and memory 1030.
Below, " visual demodulator 120 " and " picture signal receiving device 120 " can be used as the identical meaning, and can replace mutually.
According to a side, picture sensor 120 may correspond in above-mentioned image signal transmission apparatus 110.That is, communication unit 210 may correspond in communication unit 1010, and processing unit 220 may correspond in processing unit 1020, and memory 230 may correspond in memory 1030.Although with reference to Figure 11 to Figure 12, illustrate that picture signal receiving device 120 receives the method for picture signal, but picture signal receiving device 120 also can perform the method for image signal transmission performed referring to figs. 1 through the image signal transmission apparatus 110 illustrated by Fig. 9.
For communication unit 1010, processing unit 1020 and memory 1030, be described in detail hereinafter with reference to Figure 11 to Figure 12.
In statu quo can be suitable for above with reference to the technical content illustrated by Fig. 1 to Fig. 9, below be omitted detailed description.
Figure 11 is the flow chart of the method for the reception picture signal illustrated according to an embodiment.
In step 1110, communication unit 1010 can receive picture signal.Picture signal can be numeral or analog picture signal.
In step 1120, processing unit 1020 can convert analog picture signal to digital signal.The digital signal of conversion can be above-mentioned modulated image signal.Modulated image signal can comprise the aberration frequency signal of luminance frequency signal and modulation.
In step 1130, processing unit 1020 can utilize subcarrier that digital signal is separated into luminance signal and color difference signal.
According to a side, the subcarrier used in step 1130 is identical with the subcarrier used in step 350.
According to another side, subcarrier used in step 1130 can be the subcarrier used for the aberration frequency signal of modulation being demodulated to original aberration frequency signal.
In step 1140, processing unit 1020 can utilize luminance signal and color difference signal to generate digital type image signal.The digital type image signal generated can by the digital type image signal restored.
In statu quo can be suitable for above with reference to the technical content illustrated by Fig. 1 to Figure 10, below be omitted detailed description.
Figure 12 is the structure chart of the processing unit illustrated according to an example.
Processing unit 1020 can comprise at least one in analog-digital converter, demultiplexer, timing generator, subcarrier generator, demodulator, luminance filter, aberration filter, standardized digital signal maker.
Analog-digital converter, demultiplexer, timing generator, subcarrier generator, demodulator, luminance filter, aberration filter, standardized digital signal maker can be embodied by physical property device or software respectively.
Analog-digital converter can convert analog picture signal to digital signal.
Demultiplexer can utilize at least one in horizontal reference signal and vertical reference signal, aberration frequency signal digital signal being separated into timing signal, luminance frequency signal and modulating.
Timing generator can convert at least one in horizontal reference signal and vertical reference signal to digital horizontal reference signal and vertical reference signal.
Subcarrier generator can make subcarrier occur.
Demodulator by the aberration frequency signal demodulation of modulation, thus can generate aberration frequency signal.
Luminance filter can utilize luminance frequency signal to generate luminance signal.
Aberration filter can utilize aberration frequency signal to generate color difference signal.
Standardized digital signal maker can utilize at least one and luminance signal in horizontal reference signal and vertical reference signal and color difference signal to generate digital type image signal.The digital type image signal generated can be the picture signal of standard.
In statu quo can be suitable for above with reference to the technical content illustrated by Fig. 1 to Figure 11, below be omitted detailed description.
The device of above-mentioned explanation can be embodied by the combination of hardware inscape, software sharing key element and/or hardware inscape and software sharing key element.Such as, the device illustrated and inscape, can utilize similar processor, controller, arithmetic logic unit alu (arithmetic logic unit), digital signal processor (digital signal processor), microcomputer, field programmable gate array FPA (fieldprogrammable array), programmable logic cells PLU (programmable logic unit), microprocessor or perform other any devices of instruction (instruction), more than one model computer or specific purposes computer and be embodied.Processing unit can be performed in executive operating system (OS) and this operating system more than one software application.In addition, processing unit can reply the execution of software, accesses, stores, runs, processes, generates data.For the ease of understanding, it is use one that processing unit is illustrated, but in correlative technology field, the technical staff with usual knowledge should be understood that processing unit can comprise the treatment element of multiple treatment element (processing element) and/or multiple type.Such as, processing unit can comprise multiple processor or a processor, and a controller.In addition, also can be other processing configuration (processing configuration) of similar parallel processor (parallel processor).
Method according to embodiment is recorded in computer-readable media with executable program command form by multiple computer means.Program command, data file, data structure etc. that this media computer readable media can comprise independently or combine.Media and program command can be especially designed in order to the present invention and create, or for computer software technology personnel know and apply.The example of computer-readable media comprises: magnetic media (magnetic media), as hard disk, floppy disk and tape; Optical media (optical media), as CD ROM, DVD; Magneto-optical media (magneto-optical media), as CD (floptical disk); With the hardware unit being specially configured to storage and execution of program instructions, as read-only memory (ROM), random access memory (RAM) etc.The example of program command, had both comprised the machine code produced by compiler, also comprised and used interpretive program and the higher-level language code be performed by computer.For performing running of the present invention, described hardware unit can be configured to operate with more than one software mould, and vice versa.
As implied above, although the present invention is illustrated with reference to limited embodiment and accompanying drawing, the present invention is not limited to described embodiment, possesses in can from then on the recording per capita of usual knowledge and carry out various amendment and distortion in field belonging to the present invention.Such as, illustrated technology is performed by the order different from the method illustrated, or combine or combine the inscape of illustrated system, structure, device, circuit etc. by the form different from the method illustrated, or replace or replace also can obtaining suitable result by other inscapes or equal things.
Reference numeral explanation
100: the system of transmission and reception picture signal
110: image signal transmission apparatus
120: picture signal receiving device
Claims (11)
1. an image signal transmission method, comprises the following steps:
Digital type image signal is received from closed-circuit system;
Described digital type image Signal separator is become luminance signal and color difference signal;
Described luminance signal is converted to the luminance frequency signal with the 1st frequency band, and described color difference signal is converted to the aberration frequency signal with the 2nd frequency band;
Utilize subcarrier to modulate described aberration frequency signal, make described aberration frequency signal have the 3rd frequency band;
Utilize the aberration frequency signal of described luminance frequency signal and described modulation, generate the modulated image signal that described picture signal is modulated; And
Transmit described modulated image signal, and
Wherein, described modulated image signal, in order to make described 1st frequency band and described 3rd frequency band not overlapping, the frequency band being spaced apart regulation between described 1st frequency band and described 3rd frequency band.
2. image signal transmission method as claimed in claim 1, wherein, the step of described generation, is by multiplexed for the aberration frequency signal of described luminance frequency signal and described modulation, generates described modulated image signal.
3. image signal transmission method as claimed in claim 1, wherein, the step of described conversion, is utilize luminance filter to convert described luminance signal to described luminance frequency signal, and utilizes aberration filter to convert described color difference signal to described aberration frequency signal.
4. image signal transmission method as claimed in claim 1, further comprising the steps:
Convert described modulated image signal to analog picture signal, and
Wherein, transmitting the step of described modulated image signal, is the described analog picture signal of transmission.
5. image signal transmission method as claimed in claim 4, wherein, the step of described separation is that described digital type image Signal separator is become described luminance signal, described color difference signal and timing signal, and
The step of described generation, is utilize described luminance frequency signal, the aberration frequency signal of described modulation and described timing signal, generates described modulated image signal, and
Described timing signal is the synchronous signal about described analog picture signal.
6. image signal transmission method as claimed in claim 5, wherein, described timing signal comprises at least one in the vertical synchronization of described analog picture signal and horizontal synchronization.
7. image signal transmission method as claimed in claim 1, wherein, the frequency of described subcarrier, is set by utilizing frequency interleaving.
8. image signal transmission method as claimed in claim 1, wherein, the frequency of described subcarrier is more than 6MHz.
9. a computer-readable recording medium, record is used for the program that enforcement of rights requires the method in 1 to 8 described in any one.
10. an image signal transmission apparatus, comprising:
Processing unit, digital type image Signal separator is become luminance signal and color difference signal, and described luminance signal is converted to the luminance frequency signal with the 1st frequency band, and described color difference signal is converted to the aberration frequency signal with the 2nd frequency band, subcarrier is utilized to modulate, make described aberration frequency signal have the 3rd frequency band, and utilize the aberration frequency signal of described luminance frequency signal and described modulation, generate the modulated image signal that described picture signal is modulated; With
Communication unit, receives described digital type image signal from closed-circuit system, and transmits described modulated image signal, and
Wherein, described modulated image signal, in order to make described 1st frequency band and described 3rd frequency band not overlapping, the frequency band being spaced apart regulation between described 1st frequency band and described 3rd frequency band.
The picture signal method of reseptance of the picture signal receiving device of 11. 1 kinds of closed-circuit systems, described picture signal method of reseptance comprises the following steps:
Receive analog picture signal, described analog picture signal comprises the luminance frequency signal with the 1st frequency band and the aberration frequency signal with the 3rd frequency band, in order to make described 1st frequency band and described 3rd frequency band not overlapping, the frequency band being spaced apart regulation between described 1st frequency band and described 3rd frequency band;
Convert described analog picture signal to digital signal;
Utilize subcarrier, described digital signal is separated into luminance signal and color difference signal; And
Utilize described luminance signal and described color difference signal, generate digital type image signal.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR10-2014-0037493 | 2014-03-31 | ||
| KR1020140037493A KR101440260B1 (en) | 2014-03-31 | 2014-03-31 | Method and apparatus for trasmitting and receiving video signal |
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| KR (1) | KR101440260B1 (en) |
| CN (1) | CN104410848A (en) |
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| KR101552070B1 (en) | 2014-11-26 | 2015-09-09 | (주) 넥스트칩 | Method and apparatus for transmitting video signal |
| KR101573916B1 (en) | 2014-12-16 | 2015-12-02 | (주)넥스트칩 | Method and apparatus for receiving vedio |
| KR101539543B1 (en) * | 2014-12-17 | 2015-07-24 | (주) 넥스트칩 | Method and apparatus for receiving video signal |
| KR101544342B1 (en) * | 2015-02-16 | 2015-08-12 | (주) 넥스트칩 | Method and apparatus for generating digital video signal |
| TWI604723B (en) * | 2015-11-11 | 2017-11-01 | 南億電子股份有限公司 | System for converting high definition composite video broadcast signal and encoding/decoding method thereof |
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- 2014-12-05 CN CN201410741965.6A patent/CN104410848A/en active Pending
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| KR101440260B1 (en) | 2014-09-17 |
| WO2015152484A1 (en) | 2015-10-08 |
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