CN102111602B - Circuit for realizing single wire transmission of audio and video signals - Google Patents
Circuit for realizing single wire transmission of audio and video signals Download PDFInfo
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- CN102111602B CN102111602B CN200910189301.2A CN200910189301A CN102111602B CN 102111602 B CN102111602 B CN 102111602B CN 200910189301 A CN200910189301 A CN 200910189301A CN 102111602 B CN102111602 B CN 102111602B
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 60
- 238000001914 filtration Methods 0.000 claims abstract description 7
- 238000004891 communication Methods 0.000 claims abstract description 4
- 230000005236 sound signal Effects 0.000 claims description 37
- 239000000919 ceramic Substances 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 9
- 238000010586 diagram Methods 0.000 description 3
- 206010045178 Tunnel vision Diseases 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
Abstract
The invention relates to a circuit for realizing single wire transmission of audio and video signals, which comprises a transmitting end circuit and a receiving end circuit. The transmitting end circuit comprises a pre-emphasis and frequency modulation unit, a follower, and an impedance matching unit in communication connection with the pre-emphasis and frequency modulation unit and the first follower; the impedance matching unit is used for performing impedance matching processing on the output signals of the pre-emphasis and frequency modulation unit and a first follower, and transmitting the processing result to a single wire transmission cable to perform transmission; the receiving end circuit comprises a first processing unit, a second processing unit, a trapped wave and follow processing unit, and is used for transmitting the signals transmitted by the single wire transmission cable to the first processing unit and the second processing unit to perform filtration, demodulation and de-emphasis respectively, and transmitting the signals transmitted by the single wire transmission cable to a wave trap and a second follower to perform trapped wave and follow processing. According to the technical scheme of the invention, the operation is simple, and the problems that excessive connecting cables affect the attractiveness and occupy the space are avoided.
Description
Technical field
The present invention relates to field of household appliances, more particularly, relate to a kind of circuit of realizing audio-video signal single wire transmission.
Background technology
The connection of current household electrical appliance is normally used respectively multiple cable transmission by image, sound, particularly image video signal and the sound baseband signal of simulation, need three holding wires to transmit: single line transmitting image, single line passes L channel, and single line passes R channel.Although the digitized degree of television broadcasting is more and more higher, particularly as being connected of Set Top Box and television set, still lack video/audio signal that can't do without simulation as the connection of household electrical appliance, therefore the cable of use is many.At present this connected mode of household electrical appliance has caused complicated operation, the too much problem of stube cable, not only affects attractive in appearancely, also can take more space.In addition, the household electrical appliance that each family is used are more, and this drawback will be more obvious.
Summary of the invention
The technical problem to be solved in the present invention is, for the above-mentioned stube cable of prior art too much, affect defect attractive in appearance, to take more space, a kind of circuit of realizing audio-video signal single wire transmission is provided.
The technical solution adopted for the present invention to solve the technical problems is: construct a kind of circuit of realizing audio-video signal single wire transmission,
Comprise transmitting terminal circuit and receiving terminal circuit;
Described transmitting terminal circuit comprises: preemphasis and frequency modulation unit, the first follower, with the impedance matching unit of preemphasis and frequency modulation unit and the communication connection of the first follower;
Preemphasis and frequency modulation unit, for carry out the first audio signal and the second audio signal in advance
Increase the weight of and frequency modulation process;
The first follower, for following processing to vision signal;
Impedance matching unit, for the output letter to preemphasis and frequency modulation unit and the first follower
Number carry out impedance matching processing, and result is sent into single wire transmission cable transmit;
Described receiving terminal circuit comprises the first processing unit, the second processing unit, trapper and the second follower; Send into respectively for signal that single wire transmission cable is transmitted that the first processing unit, the second processing unit carry out filtering, demodulation, the processing of postemphasising, input to the first audio signal, second audio signal of described transmitting terminal circuit with reduction, and the signal that single wire transmission cable is transmitted is sent into trapper and the second follower carries out trap and follows processing, inputs to the vision signal of described transmitting terminal circuit to reduce.
In the circuit of realizing audio-video signal single wire transmission of the present invention, preemphasis and frequency modulation unit comprise:
The first preemphasis and frequency modulation unit, for the first audio signal is carried out to preemphasis processing, and used the first modulating frequency to carry out frequency modulation(FM) to result;
The second preemphasis and frequency modulation unit, for the second audio signal is carried out to preemphasis processing, and used the second modulating frequency to carry out frequency modulation(FM) to result.
In the circuit of realizing audio-video signal single wire transmission of the present invention, described the first processing unit comprises the first filter unit, the first solution mediation de-emphasis unit; Described the second processing unit comprises the second filter unit, the second solution mediation de-emphasis unit.
The first filter unit, the second filter unit, carry out filtering processing and result sent into respectively to the first solution mediation de-emphasis unit, second and separate mediation de-emphasis unit for the signal that single wire transmission cable is transmitted;
First separate be in harmonious proportion de-emphasis unit, second separate be in harmonious proportion de-emphasis unit for the output of the first filter unit, the second filter unit is carried out respectively to demodulation, the processing of postemphasising, input to the first audio signal, second audio signal of described transmitting terminal circuit to reduce.
In the circuit of realizing audio-video signal single wire transmission of the present invention, the first modulating frequency is different from the second modulating frequency, and the first modulating frequency and the second modulating frequency are outside the described bandwidth of video signal.
In the circuit of realizing audio-video signal single wire transmission of the present invention, described receiving terminal circuit also comprises match circuit, and described match circuit carries out sending into respectively the first processing unit, the second processing unit, trapper and the second follower after impedance matching and late-class circuit driving for the signal that described single wire transmission cable is transmitted again.
In the circuit of realizing audio-video signal single wire transmission of the present invention, the picture signal that described vision signal is following any standard: PAL, NTSC, SECAM.
In the circuit of realizing audio-video signal single wire transmission of the present invention, the first modulating frequency and the second modulating frequency adopt the two kinds of different frequencies that are greater than 6MHz outside the bandwidth of video signal.
In the circuit of realizing audio-video signal single wire transmission of the present invention, described the first filter unit and the second filter unit are ceramic filter, and described trapper is ceramic trapper.
In the circuit of realizing audio-video signal single wire transmission of the present invention, described match circuit is build-out resistor and signal drive circuit.
Enforcement the invention has the beneficial effects as follows: use transmitting terminal circuit to process it is transmitted on single wire transmission cable 2 tunnel audio signals and 1 tunnel vision signal at audio-video signal transmitting terminal, and the signal being transmitted on to transmission line by receiving terminal circuit at receiving terminal is divided into 3 tunnels and processes, finally reduction inputs to 2 tunnel audio signals and the 1 tunnel vision signal of transmitting terminal.Technical scheme of the present invention is simple to operate, and only just can solve transmission, picture-and-sound or the stereosonic transmission of 3 road audio-video signals with a cable, image and voice signal are blended on single line to be transmitted, needn't carry out digitized processing to signal, transmission quality is not less than the transmission quality of traditional multi-thread cable.Not only simple to operate, with low cost, port number reduces, and has saved the quantity of stube cable, has saved electrical equipment back space, has also avoided too much cable to cause affecting room problem attractive in appearance.
Brief description of the drawings
Below in conjunction with drawings and Examples, the invention will be further described, in accompanying drawing:
Fig. 1 is the circuit structure block diagram of realizing audio-video signal single wire transmission according to one embodiment of the invention;
Fig. 2 is the circuit theory diagrams of realizing audio-video signal single wire transmission according to one embodiment of the invention.
Embodiment
Fig. 1 is the structured flowchart according to the circuit of realizing audio-video signal single wire transmission 100 of one embodiment of the invention.With reference to figure 1, show transmitting terminal circuit 101, receiving terminal circuit 102.
Transmitting terminal 101 circuit comprise: preemphasis and frequency modulation unit 1011, the first follower 1012, with the impedance matching unit 1013 of preemphasis and frequency modulation unit 1011 and the communication connection of the first follower.Preemphasis and frequency modulation unit 1011, for carrying out preemphasis and frequency modulation process to the first audio signal and the second audio signal.The first follower 1012, for following processing to vision signal; Impedance matching unit 1013, for the output signal of preemphasis and frequency modulation unit and the first follower is carried out to impedance matching processing, and sends result into single wire transmission cable and transmits.
Preemphasis and frequency modulation unit 1011 comprise the first preemphasis and frequency modulation unit 1011A, for the first audio signal is carried out to preemphasis processing, and use the first modulating frequency to carry out frequency modulation(FM) to result.The second preemphasis and frequency modulation unit 1011B, for the second audio signal is carried out to preemphasis processing, and use the second modulating frequency to carry out frequency modulation(FM) to result.
Receiving terminal circuit 102 comprises the first processing unit 1021, the second processing unit 1022, trapper 1023 and the second follower 1024.Receiving terminal circuit 102 sends into respectively for the signal that single wire transmission cable is transmitted that the first processing unit 1021, the second processing unit 1022 carry out filtering, demodulation, the processing of postemphasising, input to the first audio signal, second audio signal of described transmitting terminal circuit with reduction, and the signal that single wire transmission cable is transmitted is sent into trapper 1023 and the second follower 1024 carries out trap and follows processing, inputs to the vision signal of described transmitting terminal circuit to reduce.
The first processing unit 1021 comprises that the first filter unit 1021A, first separates mediation de-emphasis unit 1021B.The second processing unit 1022 comprises that the second filter unit 1022A, second separates mediation de-emphasis unit 1022B.The first filter unit 1021A, the second filter unit 1022A, carry out filtering processing and result sent into respectively to the first solution mediation de-emphasis unit 1021B, second and separate mediation de-emphasis unit 1022B for the signal that single wire transmission cable is transmitted.First separate be in harmonious proportion de-emphasis unit 1021B, second separate be in harmonious proportion de-emphasis unit 1022B for the output of the first filter unit 1021A, the second filter unit 1022A is carried out respectively to demodulation, the processing of postemphasising, input to the first audio signal, second audio signal of described transmitting terminal circuit to reduce.
Receiving terminal circuit 102 also comprises match circuit 1025, match circuit 1025 for single wire transmission cable is transmitted signal mate and late-class circuit drive after send into respectively again the first processing unit 1021, the second processing unit 1022, trapper 1023 and the second follower 1024.
Conventionally, signal is far through transmitting after FM modulation, and as using only several meters of transmission ranges in family parlor, therefore the decay of signal is little, does not also affect FM demodulation.In order to ensure the transmission quality of image, picture signal (being vision signal) still adopts baseband transmission, and left and right acoustic channels (being first, second audio signal) adopts the mode of FM modulation.Vision signal can be the picture signal of any standard, such as PAL (Phase Alternation Line, line-by-line inversion), the NTSC (abbreviation of National TelevisionStandards Committee, National Television System Committee), SECAM (SequentielCouleur A Memoire transmits colored and storage in order) etc.For example, concerning pal mode picture signal, its bandwidth range is 0～6MHz, and the modulating frequency (i.e. the first modulating frequency and the second modulating frequency) of selecting so should be greater than 6MHz.For example, sound modulating frequency can be selected 6.5MHz and 6.7421875MHz, can certainly select other to be greater than the frequency of 6M.Institute's selected frequency and standard are only example herein, not as limitation of the present invention.Suppose to select with two identical modulating frequencies of sound accompaniment/stereophonic broadcasting, can find easily like this part components and parts, such as ceramic filter, ceramic trapper etc.For audio signal, TV is monaural, but DVD, Set Top Box are normally stereo, for the purpose of unification, two sound channels are selected in unification of the present invention, adopt stereo transmission mode, therefore at transmitting terminal and receiving terminal, 2 road voice signals are processed, so also just do not need acoustic pattern identification signal.Certainly, also can select as required, if single sound channel, only need the first preemphasis and frequency modulation unit 1011A and the second preemphasis and frequency modulation unit 1011B to adopt identical voice signal modulate and transmit at transmitting terminal, need the first processing unit 1021 and the second processing unit 1022 at receiving terminal.Also, in the time that signal is monophony, still, with 2 tunnel sound channel transmission, be only passing same signal, can ensure like this undesired mode identification signal.
The first audio signal shown in Fig. 1 and the second audio signal represent two voice signals, can be left and right acoustic channels, can be also that monophony TV signal is divided into two-way transmission.
Fig. 2 is the circuit theory diagrams of realizing audio-video signal single wire transmission according to one embodiment of the invention, provide detailed processing procedure below: the first audio signal and the second audio signal are modulated at respectively in for example 6.5MHZ and 6.7421875MHZ frequency after sound preemphasis is processed, after the video signal mixture that signal after modulation and the first follower 1012 are exported, pass through again impedance matching unit 1013 driver outputs (can be exported by the concentric socket of RCA), be transferred to receiving terminal along single transmission cable (video/audio wire) subsequently.The mixed signal that transmission cable transmits drives signal afterwards to become original half through match circuit 1025 (comprising such as but not limited to build-out resistor and signal drive circuit (not shown) etc.) impedance matching and late-class circuit, and then be divided into 3 tunnels, 1 tunnel is through delivering to FM demodulation after the first filter unit 1021A (such as but not limited to selecting 6.5MHZ ceramic filter) frequency-selecting, produce audio signal the processing of postemphasising, output signal S1, after 1 tunnel the second filter unit 1022A (such as but not limited to selecting 6.7421875MHZ ceramic filter) frequency-selecting, deliver to FM demodulation, produce audio signal the processing of postemphasising, output signal S2.Here, preemphasis will be selected the same time constant with postemphasising to process.Other 1 tunnel process 6.5MHZ and 6.7421875MHZ ceramic trapper, by the second follower 1024 output image signal V (being vision signal V), have so just been realized sound, the target of picture signal single wire transmission.Because picture signal keeps baseband transmission, two FM modulation signals are outside vision bandwidth, so do not affect picture quality, two FM modulation signal maximum frequency deviation +/-50KHZ, also do not affect mutually.2 tunnel audio signals and the vision signal of receiving terminal circuit output are 2 tunnel audio signal and the vision signals that input to transmitting terminal circuit, and whole processing procedure does not affect the quality of signal.
For 6.5MHZ and 6.7421875MHZ ceramic trapper, be equivalent to the trapper series connection of two frequencies, because bandwidth when general ceramic trapper 30dB decay is 90KHZ, bandwidth is very little, and the frequency characteristic of trapper is equivalent to have the absorption spike characteristic of two arrowbands.
In actual use, transmitting terminal needs only and respectively adds a little chip (being transmitting terminal circuit and receiving terminal circuit) and be connected and just can realize function above with a transmission cable with receiving terminal, cost is lower, transmit port and space are saved, reduce the line between electrical equipment, do not reduced again image transmitting quality.Ruo Yi tri-road AV inputs, a road AV are output as example, and port is kept to 4 by 3*4=12, and it is original 1/3rd that quantity is reduced to, and have saved the quantity of connecting line, have also saved electrical equipment back space, and operation also becomes simple in addition.
Claims (5)
1. a circuit of realizing audio-video signal single wire transmission, is characterized in that, comprises transmitting terminal circuit and receiving terminal circuit;
Described transmitting terminal circuit comprises: preemphasis and frequency modulation unit, the first follower, with the impedance matching unit of preemphasis and frequency modulation unit and the communication connection of the first follower;
Preemphasis and frequency modulation unit, for carrying out preemphasis and frequency modulation process to the first audio signal and the second audio signal;
The first follower, for following processing to vision signal;
Impedance matching unit, for the output signal of preemphasis and frequency modulation unit and the first follower is carried out to impedance matching processing, and sends result into single wire transmission cable and transmits;
Described receiving terminal circuit comprises the first processing unit, the second processing unit, trapper and the second follower; Send into respectively for signal that single wire transmission cable is transmitted that the first processing unit, the second processing unit carry out filtering, demodulation, the processing of postemphasising, input to the first audio signal, second audio signal of described transmitting terminal circuit with reduction, and the signal that single wire transmission cable is transmitted is sent into trapper and the second follower carries out trap and follows processing, inputs to the vision signal of described transmitting terminal circuit to reduce;
Preemphasis and frequency modulation unit comprise:
The first preemphasis and frequency modulation unit, for the first audio signal is carried out to preemphasis processing, and used the first modulating frequency to carry out frequency modulation(FM) to result;
The second preemphasis and frequency modulation unit, for the second audio signal is carried out to preemphasis processing, and used the second modulating frequency to carry out frequency modulation(FM) to result;
Described the first processing unit comprises the first filter unit, the first solution mediation de-emphasis unit; Described the second processing unit comprises the second filter unit, the second solution mediation de-emphasis unit.
The first filter unit, the second filter unit, carry out filtering processing and result sent into respectively to the first solution mediation de-emphasis unit, second and separate mediation de-emphasis unit for the signal that single wire transmission cable is transmitted;
First separate be in harmonious proportion de-emphasis unit, second separate be in harmonious proportion de-emphasis unit for the output of the first filter unit, the second filter unit is carried out respectively to demodulation, the processing of postemphasising, input to the first audio signal, second audio signal of described transmitting terminal circuit to reduce;
The first modulating frequency is different from the second modulating frequency, and the first modulating frequency and the second modulating frequency are outside the described bandwidth of video signal;
Described receiving terminal circuit also comprises match circuit, and described match circuit carries out sending into respectively the first processing unit, the second processing unit, trapper and the second follower after impedance matching and late-class circuit driving for the signal that described single wire transmission cable is transmitted again.
2. the circuit of realizing audio-video signal single wire transmission according to claim 1, is characterized in that, the picture signal that described vision signal is following any standard: PAL, NTSC, SECAM.
3. the circuit of realizing audio-video signal single wire transmission according to claim 1, is characterized in that, the first modulating frequency and the second modulating frequency adopt the two kinds of different frequencies that are greater than 6MHz outside the bandwidth of video signal.
4. the circuit of realizing audio-video signal single wire transmission according to claim 1, is characterized in that, described the first filter unit and the second filter unit are ceramic filter, and described trapper is ceramic trapper.
5. the circuit of realizing audio-video signal single wire transmission according to claim 1, is characterized in that, described match circuit comprises build-out resistor and signal drive circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910189301.2A CN102111602B (en) | 2009-12-23 | 2009-12-23 | Circuit for realizing single wire transmission of audio and video signals |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910189301.2A CN102111602B (en) | 2009-12-23 | 2009-12-23 | Circuit for realizing single wire transmission of audio and video signals |
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| Publication Number | Publication Date |
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| CN102111602A CN102111602A (en) | 2011-06-29 |
| CN102111602B true CN102111602B (en) | 2014-09-24 |
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| CN200910189301.2A Expired - Fee Related CN102111602B (en) | 2009-12-23 | 2009-12-23 | Circuit for realizing single wire transmission of audio and video signals |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| DE102013201685B4 (en) | 2013-02-01 | 2019-04-04 | Siemens Healthcare Gmbh | Conductor arrangement with dielectric sheath wave barrier |
| CN112152328B (en) * | 2020-10-13 | 2022-04-22 | 内蒙古旭坤电子科技有限公司 | Single wire power supply and signal transmission device |
| CN113612672A (en) * | 2021-08-04 | 2021-11-05 | 杭州微纳科技股份有限公司 | Asynchronous single-wire audio transmission circuit and audio transmission method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1905682A (en) * | 2006-08-01 | 2007-01-31 | 南京大学 | Apparatus for duplex transmitting speech and data in video baseband transmission line |
| CN201066896Y (en) * | 2007-05-30 | 2008-05-28 | 张河海 | Video, audio and data coaxial transmission device |
| CN201365319Y (en) * | 2009-03-04 | 2009-12-16 | 北京实创上地科技有限公司 | High sensitivity one-way video frequency optical transmitter and receiver |
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2009
- 2009-12-23 CN CN200910189301.2A patent/CN102111602B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1905682A (en) * | 2006-08-01 | 2007-01-31 | 南京大学 | Apparatus for duplex transmitting speech and data in video baseband transmission line |
| CN201066896Y (en) * | 2007-05-30 | 2008-05-28 | 张河海 | Video, audio and data coaxial transmission device |
| CN201365319Y (en) * | 2009-03-04 | 2009-12-16 | 北京实创上地科技有限公司 | High sensitivity one-way video frequency optical transmitter and receiver |
Non-Patent Citations (2)
| Title |
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| 吴文佳.基于单同轴电缆传输电视监控信号的电路设计.《电视技术》.2003,(第7期),第1页第2.1－2.2节，第2页第3.2节，图1－2. |
| 基于单同轴电缆传输电视监控信号的电路设计;吴文佳;《电视技术》;20031231(第7期);第1页第2.1－2.2节，第2页第3.2节，图1－2 * |
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| CN102111602A (en) | 2011-06-29 |
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