CN104822054A - Transmitting device, receiving device and system adopting power line to transmit audio and video signals - Google Patents
Transmitting device, receiving device and system adopting power line to transmit audio and video signals Download PDFInfo
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Abstract
The embodiment of the invention discloses a transmitting device, a receiving device and a system adopting a power line to transmit audio and video signals and belongs to the signal transmission control technical field. The transmitting device comprises a first processor, a first modem, a power amplifier, a rectifying and filtering circuit and a first coupler, wherein the first processor is used for obtaining audio and video signals acquired by a camera and performing computation processing on the audio and video signals acquired by the camera, the first modem is used for performing spread spectrum modulation on the audio and video signals which have been subjected to the computation processing, the power amplifier is used amplifying the audio and video signals which have been subjected to the spread spectrum modulation, the rectifying and filtering circuit is used for rectifying and filtering the amplified audio and video signals, and the first coupler is used for loading the rectified and filtered audio and video signals on a direct current power source line, so that the audio and video signals can be transmitted. With the transmitting device, the receiving device and the system of the invention adopted, re-wiring is not required, and wiring difficulty can be reduced, and signal transmission quality can be ensured.
Description
Technical field
The present invention relates to Signal transmissions control technology field, particularly the system of a kind of audio-video signal dispensing device, audio-video signal receiving system and power line transmission audio-video signal.
Background technology
Along with the development of science and technology, camera has become the occasion record such as family, company gate inhibition, has stored the first-selected media of information, and user can pass through camera collection video, audio frequency or sound, video mix information, very convenient.At present, in automobile monitoring field, camera have also been obtained to be applied widely, usual motor vehicle operators is when driving, with the audio frequency and video image of camera picked-up car internal and external environment situation, and by the display screen after the process of signal receiving device in car image display out, to reach object or other monitoring demand of traffic safety.
The existing vehicle-mounted camera of existing market is divided into common wired camera and wireless RF (RadioFrequency, radio frequency) camera, and wherein, wired camera also needs to be equipped with special audio-video signal line and is connected with signal receiving device.Camera and signal receiving device form audio/video signal transmission system, usually have two kinds of signal transmission forms between both: the first is undertaken connecting and Signal transmissions by special audio-video signal line between camera and signal receiving device, the second carries out transmission of wireless signals between camera employing wireless radio frequency mode and signal receiving device.
Existing audio/video signal transmission system also exists following problem: adopt the first signal transmission form between camera and signal receiving device, due to special audio-video signal line must be connected between the two, its wiring is longer and many, be not easy to wiring, and the kind of interface of audio-video signal line is numerous and diverse, install extremely inconvenience, installation difficulty is large.And between camera and signal receiving device, adopt the second transmission of wireless signals mode, although camera and signal receiving device are without the need to other wiring, easy for installation, but owing to utilizing wireless transmission method, in view of automobile itself has had numerous wireless devices, so be easy to cause signal disturbing, and be difficult to when the data syn-chronization of multiple camera ensure in time synchronously.
Summary of the invention
The invention provides the system of a kind of dispensing device, receiving system and power line transmission audio-video signal, without the need to rewiring, reduce wiring difficulty, and ensure that signal transmission quality.
Described technical scheme is as follows:
Embodiments provide a kind of dispensing device, comprise first processor, the first modulator-demodulator, power amplifier, current rectifying and wave filtering circuit and the first coupler, wherein, first processor, be connected with camera and the first modulator-demodulator, for obtaining the audio-video signal of camera collection, and be supplied to the first modulator-demodulator after the audio-video signal of camera collection is carried out calculation process; First modulator-demodulator, is connected with first processor and power amplifier, after the audio-video signal after calculation process is carried out expansion key system, be supplied to power amplifier; Power amplifier, is connected with the first modulator-demodulator and current rectifying and wave filtering circuit, after being amplified by the audio-video signal after band spectrum modulation, be supplied to current rectifying and wave filtering circuit; Rectifier filter, is connected with power amplifier and the first coupler, after the audio-video signal after amplification is carried out rectifying and wave-filtering, be supplied to the first coupler; First coupler, is connected with direct current supply line with rectifier filter, transmits for being loaded on direct current supply line by the audio-video signal after rectifying and wave-filtering.
In preferred embodiment of the present invention, described first processor is MCU.
In preferred embodiment of the present invention, described camera is simulation camera or digital camera, if camera is simulation camera, the audio-video signal that simulation camera provides is analog audio-video signal, then first processor also carries out calculation process again after the audio-video signal of simulation camera collection is converted to digital audio-video signal.
In preferred embodiment of the present invention, described first modulator-demodulator is spread spectrum modem, and spread spectrum modem utilizes DCSK spread-spectrum modulation technique, carries out band spectrum modulation processing to the audio-video signal after calculation process.
In preferred embodiment of the present invention, the direct current supply line of described direct current supply line 12V.
The embodiment of the present invention additionally provides a kind of receiving system, it comprises: the second coupler, receiving circuit, second modem and control unit, wherein, second coupler, be connected with direct current supply line, for being extracted by the audio-video signal that direct current supply line transmits, and the audio-video signal of extraction is supplied to receiving circuit; Receiving circuit, is connected with second modem with the second coupler, is supplied to second modem after the audio-video signal for being extracted by the second coupler carries out filtering; Second modem, is connected with receiving circuit and control unit, after filtered audio-video signal is carried out demodulation, be supplied to control unit; Control unit, is connected with second modem and display, shows for being supplied to display after the audio-video signal after demodulation is converted to display.
In preferred embodiment of the present invention, described receiving circuit, carries out filtering after the audio-video signal also for being extracted by the second coupler amplifies again.
In preferred embodiment of the present invention, described second modem utilizes the demodulation techniques of envelope demodulation or resonance and demodulation type to carry out demodulation to filtered audio-video signal.
In preferred embodiment of the present invention, described control unit is vehicle-mounted electronic control unit.
The embodiment of the present invention additionally provides a kind of system of power line transmission audio-video signal, and it comprises: described dispensing device, described receiving system, is connected between described dispensing device and described receiving system by direct current supply line.
The beneficial effect that the technical scheme that the embodiment of the present invention provides is brought is:
The audio-video signal of camera collection is obtained by processor, and the audio-video signal of camera collection is carried out the process such as computing, audio-video signal after the process such as computing is carried out expansion key system by modulator-demodulator, audio-video signal after band spectrum modulation amplifies by power amplifier, audio-video signal after amplification is carried out rectifying and wave-filtering by rectifier filter, and the audio-video signal after rectifying and wave-filtering is loaded on direct current supply line and transmits by coupler.The audio-video signal of camera collection can be loaded on direct current supply line and transmit by dispensing device of the present invention after treatment, therefore install vehicle-mounted camera time without the need to connecting special audio-video signal line more separately, avoid the troublesome operation of installing holding wire, reduce and install and wiring difficulty, dispensing device only utilizes existing power supply line just can realize the transmission of audio, video data, greatly reduce the cost of engineering construction, improve operating efficiency, and dispensing device also assures that the quality of Signal transmissions.
Above-mentioned explanation is only the general introduction of technical solution of the present invention, in order to technological means of the present invention can be better understood, and can be implemented according to the content of specification, and can become apparent to allow above and other object of the present invention, feature and advantage, below especially exemplified by preferred embodiment, and coordinate accompanying drawing, be described in detail as follows.
Accompanying drawing explanation
Fig. 1 is the main frame block diagram of the system of the power line transmission audio-video signal that first embodiment of the invention provides;
Fig. 2 is the main frame block diagram of the dispensing device shown in Fig. 1;
Fig. 3 is the main frame block diagram of the receiving system shown in Fig. 1.
Embodiment
For further setting forth the present invention for the technological means reaching predetermined goal of the invention and take and effect, below in conjunction with accompanying drawing and preferred embodiment, to its embodiment of system of the dispensing device proposed according to the present invention, receiving system and power line transmission audio-video signal, structure, feature and effect, be described in detail as follows.
Aforementioned and other technology contents, Characteristic for the present invention, can clearly present in following cooperation describes in detail with reference to graphic preferred embodiment.By the explanation of embodiment, when can to the present invention for the technological means reaching predetermined object and take and effect be able to more deeply and concrete understanding, however institute's accompanying drawings be only to provide with reference to and the use of explanation, be not used for being limited the present invention.
Fig. 1 is the main frame block diagram of the system of the power line transmission audio-video signal that first embodiment of the invention provides.Refer to Fig. 1, the system of power line transmission audio-video signal, comprise dispensing device 101 and receiving system 103, be wherein connected by direct current supply line 105 between dispensing device 101 and receiving system 103.
Wherein, dispensing device 101, be connected with direct current supply line 105 with camera 107, for receiving the audio-video signal that camera 107 gathers, this audio-video signal is original audio-video signal, is loaded on direct current supply line 105 and transmits after the process such as original audio-video signal carries out modulating by dispensing device 101, amplify, rectifying and wave-filtering.Receiving system 103, be connected with direct current supply line 105 with display 109, for isolating the audio-video signal of transmission from direct current supply line 105, isolated audio-video signal is reduced to original audio-video signal, and is supplied to display 109 after original audio-video signal is converted to display and shows.Preferably, direct current supply line 105 is the power line be connected with existing automobile supply module in automobile.In the present embodiment, direct current supply line 105 can be such as the direct current supply line of 12V (volt), and in other embodiments of the present invention, direct current supply line 105 also can be the direct current supply line of other magnitude of voltage of transmission.
It should be noted that, dispensing device 101 and receiving system 103 also can use as an independent device, such as dispensing device 101 can as original audio-video signal being treated to the dispensing device that is carried in and direct current supply line carries out the audio-video signal transmitted and being used alone, same, receiving system 103 also can be used alone as by being treated to the receiving system of display from isolated audio-video signal on direct current supply line 105.The concrete framework of dispensing device 101 and receiving system 103 refers to the detailed description of Fig. 2 and Fig. 3.
In sum, the system of the power line transmission audio-video signal that the embodiment of the present invention provides, to be undertaken original audio-video signal modulating by dispensing device 101, amplifies, is loaded on direct current supply line 105 after the process such as rectifying and wave-filtering and transmits.Receiving system 103 isolates the audio-video signal of transmission from direct current supply line 105, and isolated audio-video signal is reduced to original audio-video signal, and is supplied to display 109 after original audio-video signal is converted to display and shows.The audio-video signal of camera collection can be loaded on direct current supply line and transmit by the dispensing device of the system of power line transmission audio-video signal of the present invention after treatment, receiving system will show from being supplied to display 109 after isolated audio-video signal direct current supply line 105 processes, therefore install vehicle-mounted camera time without the need to connecting special audio-video signal line more separately, avoid the troublesome operation of installing holding wire, reduce and install and wiring difficulty, only utilize existing power supply line and dispensing device, receiving system is connected the transmission and reception that just can realize audio, video data, process, greatly reduce the cost of engineering construction, improve operating efficiency, and dispensing device and receiving system also assures that the quality of Signal transmissions and process.
Fig. 2 is the main frame block diagram of the dispensing device shown in Fig. 1.Refer to Fig. 2, dispensing device 101 comprises: processor 201 (first processor), modulator-demodulator 203 (the first modulator-demodulator), power amplifier 206, current rectifying and wave filtering circuit 207 and coupler 209 (the first coupler).
More specifically, processor 201, is connected with camera 107 and modulator-demodulator 203, and for obtaining the audio-video signal that camera 107 gathers, and the audio-video signal gathered by camera 107 is supplied to modulator-demodulator 203 after carrying out the process such as computing.
Wherein, camera 107 can be installed on outside body of a motor car or within optional position, the audio-video signal of collection for gathering the audio-video signal corresponding with ambient condition information, and is supplied to processor 201 by it.If camera 107 is digital camera, then the audio-video signal that camera 107 provides is digital audio-video signal.If camera 107 is simulation camera, then the audio-video signal that camera 107 provides is analog audio-video signal.
Processor 201 can be MCU (Microcontroller Unit, micro-control unit).If camera 107 is simulation camera, the audio-video signal that camera 107 provides is analog audio-video signal, then the audio-video signal of processor 201 also for being gathered by camera 107 carries out the process such as computing after being converted to digital audio-video signal again.Calculation process such as can for calculating the process such as the frequency of audio-video signal.
Preferably, processor 201 is also supplied to modulator-demodulator 203 after the audio-video signal after the process such as computing is carried out filtering process.That is, the process in the present embodiment can comprise the process such as computing, filtering, analog-to-digital conversion.
Modulator-demodulator 203, is connected with processor 201 and power amplifier 206, after the audio-video signal after the process such as computing is carried out expansion key system, be supplied to power amplifier 206.
In the present embodiment, modulator-demodulator 203 can be spread spectrum modem, further, spread spectrum modem can utilize DCSK (differential chaos shift keying, differential Chaos Shift Keying) spread-spectrum modulation technique, carry out band spectrum modulation processing to the audio-video signal after the process such as computing, thus the audio-video signal antijamming capability after band spectrum modulation can be made strong, the error rate is low.
Power amplifier 206, is connected with modulator-demodulator 203 and current rectifying and wave filtering circuit 207, after being amplified by the audio-video signal after band spectrum modulation, be supplied to current rectifying and wave filtering circuit 207.
Rectifier filter 207, is connected with power amplifier 206 and coupler 209, after the audio-video signal after amplification is carried out rectifying and wave-filtering, be supplied to coupler 209.Filtering is filtering interference signals mainly.
Coupler 209, is connected with direct current supply line 105 with rectifier filter 207, transmits for being loaded on direct current supply line 105 by the audio-video signal after rectifying and wave-filtering.In addition, in the present embodiment, coupler 209 can also stop the anti-object being poured into other circuit be connected with coupler 209 of the electric current and voltage on direct current supply line 105.
Preferably, dispensing device also comprises the existing known parts such as the oscillator 211 be connected with processor 201, the memory 213 be connected with processor 201, does not repeat them here.Wherein, oscillator 211 provides clock signal for giving processor 201, and memory 213 is for storing the data of the types such as audio frequency and video.
In sum, the dispensing device that the embodiment of the present invention provides, the audio-video signal of camera 107 collection is obtained by processor 201, and the audio-video signal gathered by camera 107 carries out the process such as computing, audio-video signal after the process such as computing is carried out expansion key system by modulator-demodulator 203, audio-video signal after band spectrum modulation amplifies by power amplifier 206, audio-video signal after amplification is carried out rectifying and wave-filtering by rectifier filter 207, and the audio-video signal after rectifying and wave-filtering is loaded on direct current supply line 105 and transmits by coupler 209.The audio-video signal of camera collection can be loaded on direct current supply line and transmit by dispensing device of the present invention after treatment, therefore install vehicle-mounted camera time without the need to connecting special audio-video signal line more separately, avoid the troublesome operation of installing holding wire, reduce and install and wiring difficulty, dispensing device only utilizes existing power supply line just can realize the transmission of audio, video data, greatly reduce the cost of engineering construction, improve operating efficiency, and dispensing device also assures that the quality of Signal transmissions.
Fig. 3 is the main frame block diagram of the receiving system shown in Fig. 1.Refer to Fig. 3, receiving system 103 comprises: coupler 301 (the second coupler), receiving circuit 303, modulator-demodulator 306 (second modem), processor 307 (the second processor) and control unit 309.
Coupler 301, is connected with direct current supply line 105, for being extracted by the audio-video signal of transmission on direct current supply line 105, and the audio-video signal of extraction is supplied to receiving circuit 303.
Wherein, coupler 301 to be mainly used to isolate on power line 105 audio-video signal of transmission, and the coupler 209 that this audio-video signal is dispensing device 101 is loaded into the audio-video signal after rectifying and wave-filtering direct current supply line 105 carrying out transmit.
Receiving circuit 303, is connected with modulator-demodulator 306 with coupler 301, is supplied to modulator-demodulator 306 after the audio-video signal for being extracted by coupler 301 carries out filtering.
Preferably, receiving circuit 303 can comprise low noise amplifier (LNA) and filter circuit, and the audio-video signal being respectively used to coupler 201 to extract carries out amplifying and filtering.It can thus be appreciated that further, receiving circuit 303, is supplied to modulator-demodulator 306 after the audio-video signal also for being extracted by coupler 301 amplifies after carrying out filtering again.
Modulator-demodulator 306, is connected with receiving circuit 303 and processor 307, after filtered audio-video signal is carried out demodulation, be supplied to processor 307.
Wherein, the effect of the modulator-demodulator 306 in receiving system and the modulator-demodulator 203 in dispensing device is contrary, modulator-demodulator 203 in dispensing device has modulating action, and the adjustment demodulator 306 in receiving system has demodulation effect, the audio-video signal got off because being coupled from direct current supply line 105 is generally the signal of high frequency, and modulator-demodulator 306 audio-video signal of high frequency is returned to original audio-video signal herein, preferably, modulator-demodulator 306 can utilize such as envelope demodulation, the demodulation techniques of the types such as resonance and demodulation carry out demodulation to filtered audio-video signal.
Processor 307, is connected with control unit 309 with modulator-demodulator 306, for the audio-video signal after demodulation is supplied to control unit 309.In the present embodiment, processor 307, only as signal transmission effect, therefore can save, and namely modulator-demodulator 306 is directly connected with control unit 309.
Control unit 309, is connected with processor 307 and display 109, shows for being supplied to display 109 after the audio-video signal after demodulation is converted to display.
In the present embodiment, control unit 309 can be vehicle-mounted electronic control unit (Electronic ControlUnit, ECU), is also called " car running computer ", " vehicle-mounted computer " etc.
Preferably, receiving system also comprises the existing known parts such as the oscillator 311 be connected with processor 307, the memory 313 be connected with processor 307, does not repeat them here.Wherein, oscillator 311 provides clock signal for giving processor 307, and memory 213 is for storing the data of the types such as audio frequency and video.
In sum, the receiving system that the embodiment of the present invention provides, extracted by the audio-video signal of coupler 301 by transmission on direct current supply line 105, and the audio-video signal of extraction is supplied to receiving circuit 303, the audio-video signal that coupler 301 extracts by receiving circuit 303 carries out filtering, filtered audio-video signal is carried out demodulation by modulator-demodulator 306, and control unit 309 is supplied to display 109 after the audio-video signal after demodulation is converted to display and shows.The audio-video signal of transmission on direct current supply line 105 can extract by receiving system of the present invention, display 109 can be supplied to after treatment show, receiving system only needs to connect existing power line and just can receive audio-video signal and carry out respective handling, therefore install vehicle-mounted camera time without the need to connecting special audio-video signal line more separately, avoid the troublesome operation of installing holding wire, reduce and install and wiring difficulty, receiving system only utilizes existing power supply line just can realize reception and the process of audio, video data, greatly reduce the cost of engineering construction, improve operating efficiency, and receiving system also assures that the quality of signal transacting.
The above, it is only preferred embodiment of the present invention, not any pro forma restriction is done to the present invention, although the present invention discloses as above with preferred embodiment, but and be not used to limit the present invention, any those skilled in the art, do not departing within the scope of technical solution of the present invention, make a little change when the technology contents of above-mentioned announcement can be utilized or be modified to the Equivalent embodiments of equivalent variations, in every case be do not depart from technical solution of the present invention content, according to any simple modification that technical spirit of the present invention is done above embodiment, equivalent variations and modification, all still belong in the scope of technical solution of the present invention.
Claims (10)
1. a dispensing device, is characterized in that, it comprises: first processor, the first modulator-demodulator, power amplifier, current rectifying and wave filtering circuit and the first coupler, wherein,
Described first processor, is connected with camera and described first modulator-demodulator, for obtaining the audio-video signal of described camera collection, and is supplied to described first modulator-demodulator after the audio-video signal of described camera collection is carried out calculation process;
Described first modulator-demodulator, is connected with described first processor and described power amplifier, after the audio-video signal after calculation process is carried out expansion key system, be supplied to described power amplifier;
Described power amplifier, is connected with described first modulator-demodulator and described current rectifying and wave filtering circuit, after being amplified by the audio-video signal after band spectrum modulation, be supplied to described current rectifying and wave filtering circuit;
Described rectifier filter, is connected with described power amplifier and described first coupler, after the audio-video signal after amplification is carried out rectifying and wave-filtering, be supplied to described first coupler;
Described first coupler, is connected with direct current supply line with rectifier filter, transmits for being loaded on described direct current supply line by the audio-video signal after rectifying and wave-filtering.
2. dispensing device according to claim 1, is characterized in that, described first processor is MCU.
3. dispensing device according to claim 1, it is characterized in that, described camera is simulation camera or digital camera, if described camera is simulation camera, the audio-video signal that described simulation camera provides is analog audio-video signal, then described first processor also carries out calculation process again after the audio-video signal of described simulation camera collection is converted to digital audio-video signal.
4. dispensing device according to claim 1, is characterized in that, described first modulator-demodulator is spread spectrum modem, and described spread spectrum modem utilizes DCSK spread-spectrum modulation technique, carries out band spectrum modulation processing to the audio-video signal after calculation process.
5. dispensing device according to claim 1, is characterized in that, the direct current supply line of described direct current supply line 12V.
6. a receiving system, is characterized in that, it comprises: the second coupler, receiving circuit, second modem and control unit, wherein,
Described second coupler, is connected with direct current supply line, for being extracted by the audio-video signal that described direct current supply line transmits, and the audio-video signal of extraction is supplied to described receiving circuit;
Described receiving circuit, is connected with described second modem with described second coupler, is supplied to described second modem after the audio-video signal for being extracted by described second coupler carries out filtering;
Described second modem, is connected with described receiving circuit and described control unit, after filtered audio-video signal is carried out demodulation, be supplied to described control unit;
Described control unit, is connected with described second modem and display, shows for being supplied to described display after the audio-video signal after demodulation is converted to display.
7. receiving system according to claim 6, is characterized in that, described receiving circuit, carries out filtering again after the audio-video signal also for being extracted by described second coupler amplifies.
8. receiving system according to claim 6, is characterized in that, described second modem utilizes the demodulation techniques of envelope demodulation or resonance and demodulation type to carry out demodulation to filtered audio-video signal.
9. receiving system according to claim 6, is characterized in that, described control unit is vehicle-mounted electronic control unit.
10. the system of a power line transmission audio-video signal, it is characterized in that, it comprises: the dispensing device as described in any one of claim 1-5, receiving system as described in any one of claim 6-9, is connected between described dispensing device and described receiving system by direct current supply line.
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