CN2779764Y - A video & audio transmission device - Google Patents
A video & audio transmission device Download PDFInfo
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- CN2779764Y CN2779764Y CN 200520040778 CN200520040778U CN2779764Y CN 2779764 Y CN2779764 Y CN 2779764Y CN 200520040778 CN200520040778 CN 200520040778 CN 200520040778 U CN200520040778 U CN 200520040778U CN 2779764 Y CN2779764 Y CN 2779764Y
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Abstract
The utility model relates to an image/sound transmitting device which is composed of a transmitting device and a receiving device. Image/sound signals can be transmitted to the other position from one position in a house. The utility model uses the coaxial cable wiring of a cable television in the existing house to transmit the image/sound signals of which the frequency range is more than 1000 MHz. The utility model can effectively prevent mutual interference between adjacent users, can avoid destroying the beautiful appearance of decoration owing to rewiring and has the function that the utility model can prevent the transmission of adjacent interference remote control signals.
Description
Technical field
The utility model uses in the family about a kind of, the audio and video transmitting set of the video-audio signal that audio-visual source device can be produced audio-visual playback equipment at another place during one transmission is got home from family, thus realize that one or more audio-visual source signals can be positioned at not that the audio-visual playback equipment of chummery receives and plays by a plurality of.
Background technology
Along with the large tracts of land of all kinds of audio-visual source devices such as VCD/DVD video disc player, top box of digital machine, satellite receiver popularizes, because this kind equipment generally can only pass through AV line wired connection audio-visual playback equipment such as television set, power amplifier or audio amplifier nearby, and all having two even more is distributed in the not television set of chummery usually among a large number of users man, and these television sets need to receive the video-audio signal of these audio-visual source devices too.
As shown in Figure 4, known a kind of wireless image-sound transmitting device, it is modulated to 900MHz or 1200MHz or 2.4GHz with wireless open circuit mode another place that is transferred in the family from family with the AV video-audio signal;
As shown in Figure 5, known another kind of transmission means is directly with the wired room of moving second television set place to of AV line;
As shown in Figure 5, another known transmission means, directly connect audio-visual source and second television set with a twisted-pair feeder, with transmitter with the AV signal in audio-visual source with base band or be modulated to frequency band transmission to the second a television set place, be output as the AV signal with reception of receiver base band or demodulation again, and then the AV signal is received on the television set;
The problem that above-mentioned wireless image-sound transmitting device exists is: though wireless open circuit transmission means installation, mobile all very convenient, but the electromagnetic environment of using is had relatively high expectations, co-channel interference can not be arranged, otherwise video-audio signal can be subjected to very big pollution, the user can't be accepted, especially adjacent two users are the mutual interference of meeting phase when using same frequency to transmit simultaneously, and level security is also relatively poor, is received and plays by neighboring user easily;
And no matter directly connect audio-visual source and second television set with AV line, twisted-pair feeder, it is attractive in appearance and bring the inconvenience of installing all can to destroy user's household decoration, and this connected mode can't return remote signal.
Summary of the invention
Technical problem to be solved in the utility model is, above-mentioned deficiency at prior art, and a kind of novel audio and video transmitting set is provided, he can effectively utilize the coaxial cable of existing transmission cable TV in the family, by the band transmissions video-audio signal of this coaxial cable more than 1000MHz.
Usually the typical case's wiring that has cable tv coax in the family of multiple TV set is: house lead in connects the distributor input, and dispenser output end is connected to multiple TV set, also has the user to connect distributor again under distributor and connects more television sets.
Usually television set is the main playback equipment of video-audio signal, and television set generally all has the coaxial cable wiring behind, and the spectral characteristic of coaxial cable in short distance is very good, be fit to propagate hyperfrequency UHF300M ~ 3G, superfrequency SHF3G ~ 30G even extremely high frequency EHF30G ~ 300G, compare with wireless, coaxial cable is reliable and stable, co-channel interference and burst noise are very little, it is highly stable and convenient to be used for the inner transmitting audio-video signal of dwelling house, and this transmission medium of coaxial cable is audio-visual preferably transmission medium in the family.
According to Chinese industry standard number: GY/T 106-1999 " cable tv broadcast systems technology standard " regulation 5MHz is the special use of cable TV related service to 1000MHz, and the output of distributor isolation each other is higher in the frequency range below 1000MHz, usually at 30dB between the 18dB, frequency is low more, isolation is high more, below 5MHz, almost completely isolate, and its isolation reduces along with the raising of frequency, more than 1000MHz, dispenser output end isolation each other is lower, and is lower at the above isolation of 2.4GHz; As seen it is very ingenious and suitable utilizing the wiring of premises existing wired television coaxial cable and being chosen in the above band transmissions video-audio signal of 1000MHz.
Simultaneously, the audio-visual source device of remote control needs the passback remote signal for the convenience of the user, and adjacent interference and other malice remote controls for preventing remote signal the utility model proposes further technical scheme.
The technical solution of the utility model is as follows:
As shown in Figure 1, a kind of audio and video transmitting set is made up of dispensing device (1) and receiving system (2); Wherein, dispensing device (1) is made up of a motherboard and power supply and casing, power supply is connected to motherboard, motherboard places casing inside, be equipped with video-audio signal input interface (11), radio-frequency modulator (12) and video-audio signal transmission interface (13) on this motherboard, wherein, video-audio signal input interface (11) is connected to radio-frequency modulator (12), and radio-frequency modulator (12) is connected to video-audio signal transmission interface (13); Wherein, receiving system (2) is made up of a motherboard and power supply and casing, power supply is connected to motherboard, motherboard places casing inside, be equipped with video-audio signal receiving interface (21), radio-frequency (RF) demodulator (22) and video-audio signal output interface (23) on this motherboard, wherein, video-audio signal receiving interface (21) is connected to radio-frequency (RF) demodulator (22), and radio-frequency (RF) demodulator (22) is connected to video-audio signal output interface (23); Wherein, be input to the video-audio signal input interface (11) of dispensing device (1) from the video-audio signal of audio-visual source device, through being modulated to radiofrequency signal behind the radio-frequency modulator (12), passing through video-audio signal transmission interface (13) again sends on the transmission medium, the video-audio signal receiving interface (21) of receiving system (2) receives this radiofrequency signal from transmission medium, be demodulated into video-audio signal through radio-frequency (RF) demodulator (22), pass through video-audio signal output interface (23) again and output to the video-audio signal playback equipment; Wherein, described transmission medium is a coaxial cable, described video-audio signal transmission interface (13) is a coaxial cable interface, described video-audio signal receiving interface (21) also is a coaxial cable interface, and described radio-frequency modulator (12) is modulated to radiofrequency signal more than the 1000MHz with video-audio signal, correspondingly, described radio-frequency (RF) demodulator (22) is operated in same frequency range with radio-frequency modulator (12), and this radiofrequency signal is demodulated to video-audio signal.
Further technical scheme of the present utility model is as follows:
Wherein, video-audio signal transmission interface (13) and video-audio signal receiving interface (21) this coaxial cable interface all is connected or coupling or directional couple online to the cable tv coax of dwelling house inside.
Wherein, the coaxial cable interface of described video-audio signal transmission interface (13) is the cable tv coax interface of 75 ohmages, and the coaxial cable interface of described video-audio signal receiving interface (21) is the cable tv coax interface of 75 ohmages.
Wherein, the coaxial cable interface of described video-audio signal transmission interface (13) is the coaxial cable interface of 50 ohmages, and the coaxial cable interface of described video-audio signal receiving interface (21) is the coaxial cable interface of 50 ohmages.
Wherein, video-audio signal transmission interface (13) and the used connector of video-audio signal receiving interface (21) are selected from F, SMA, SMB, SMC, CC4, MCX, MMCX, N, BNC, TNC, UHF, L9, C3, C5, C6,1/2,7/8,7/16 and off-gauge customization connector.
Because dispensing device (1) and receiving system (2) all are connected on certain output port of distributor by coaxial cable, the isolation between the dispenser output end mouth is the main cause of fading channel between dispensing device (1) and the receiving system (2).Therefore the receiver sensitivity of the emission of radio frequency signals power of dispensing device (1) and receiving system (2) is chosen in the suitable scope and can satisfies the fading channel requirement.
Wherein, the difference of the receiving sensitivity of the emission of radio frequency signals power of dispensing device (1) and receiving system (2) is more than 40db.
Wherein, the difference of the receiving sensitivity of the emission of radio frequency signals power of dispensing device (1) and receiving system (2) more than 60db for well.
Wherein, the difference of the receiving sensitivity of the emission of radio frequency signals power of dispensing device (1) and receiving system (2) is better more than 80db.
Wherein, the difference of the receiving sensitivity of the emission of radio frequency signals power of dispensing device (1) and receiving system (2) is better more than 100db.
Wherein, the emission of radio frequency signals power after radio-frequency modulator (12) modulation be arrive at 10db-10db between.
Wherein, the emission of radio frequency signals power after radio-frequency modulator (12) modulation be to better between the-5db at 0db.
Wherein, radio-frequency (RF) demodulator (22) to the receiving sensitivity of radiofrequency signal at-40db between-the 120db.
Wherein, radio-frequency (RF) demodulator (22) to the receiving sensitivity of radiofrequency signal at-70db to more suitable between the-90db.
Wherein, this audio and video transmitting set also comprises a filter, and this filter at least can the described radiofrequency signal of filtering, this filter serial connection or be socketed on the house lead in of dwelling house cable tv coax.
Wherein, described filter is the low pass filter of 1000MHz, and this filter can the above radiofrequency signal of two-way filtering 1000MHz.
Wherein, described low pass filter has good frequency spectrum flatness and lower insertion loss below 1000MHz, and can effectively filter the above signal of 1000MHz, can prevent interference, and the video-audio signal after preventing to modulate is to external transmission from the noise signal of the cable television network video-audio signal after to modulation.
Wherein, described filter is a band stop filter, and this filter institute filtered bands covers described radiofrequency signal used band.
Wherein, described filter can also be used ferrite or magnetic bead serial connection instead or be socketed on the house lead in of dwelling house cable tv coax, is used to absorb the energy of described radiofrequency signal, prevents that this radiofrequency signal from outwards transmitting.
Wherein, radio-frequency modulator (12) and the used modulation system of radio-frequency (RF) demodulator (22) are the FM modulation.
Wherein, radio-frequency modulator (12) and the used modulation system of radio-frequency (RF) demodulator (22) can also be AM or PM one of them.
Wherein, radio-frequency modulator (12) and the used modulation system of radio-frequency (RF) demodulator (22) can also be digital modulation, its modulation system be selected from FSK, ASK, PSK, QFSK, QAM, 64QAM, 128QAM, QPSK, GFSK, frequency hopping, FDM, OFDM, DS-CDMA one of them.
Wherein, comprise a signal of video signal change-over circuit in the video-audio signal input interface (11), it can be a composite video signal with the VGA conversion of signals.
Wherein, video-audio signal input interface (11) is one road composite video input and two-way or six road or eight road audio input interfaces, and video-audio signal output interface (23) is one road composite video output and two-way or six road or eight road audio output interfaces.
Wherein, dispensing device (1) be an independent electronic or one be integrated in various audio-visual source devices inner and with the attached electronic device of their common sources, casing; Wherein, described audio-visual source device is selected from video disc player, wired digital set-top box, IPTV set-top box, ground digital set-top box, satellite receiver, PC, CD-audio player, video tape recorder, DVR, digital camera, Digital Video, power amplifier and other can provide the equipment of video-audio signal.
Wherein, receiving system (2) be an independent electronic or one be integrated in various video-audio signal playback equipments inner and with the attached electronic device of their common sources, casing; Wherein, described video-audio signal playback equipment is selected from the equipment that television set, display, projecting apparatus, PC, audio amplifier, power amplifier and other can playing audio/video signals.
Wherein, the radio frequency band that send to receive video-audio signal between described video-audio signal transmission interface (13) and the video-audio signal receiving interface (21) at 2.4GHz between the 2.4835GHz, this frequency range is owing to belong to ISM band, need not apply for and examine and approve during wireless use, be very suitable for the situation that coaxial cable transmission and wireless transmission need the flexible conversion use.
Wherein, described communication frequency arrives within the 2.4835GHz scope at 2.4GHz, and this communications band is divided into 4 to 10 sections, and each section can transmission of one line signal of video signal and two-way or six road or eight tunnel audio signals as a channel.
Wherein, go up wireless aerial of increase at the video-audio signal transmission interface (13) of described dispensing device (1), and at wireless aerial of the last increase of the video-audio signal receiving interface (21) of described receiving system (2), the user both can select with wired coaxial cable transmission signals like this, also can select wireless signal transmission, allow the user that more use flexibility and convenience are arranged.
Wherein, refute by coaxial cable interface between the video-audio signal transmission interface (13) of described dispensing device (1) and its antenna and connect, refute by coaxial cable interface between the video-audio signal receiving interface (21) of described receiving system (2) and its antenna and connect, need wireless transmission to plug into like this and go up antenna, taking off antenna when needing coaxial transmission plugs into and goes up coaxial getting final product, like this can Wireless-wire dual-purpose, very convenient, plug into and environment that electromagnetic interference is less can conveniently be selected wireless transmission to inconvenience is wired, and have the occasion of coaxial cable just can select coaxial wire transmission.
Wherein, video-audio signal transmission interface (13) is the SMA head with the connector of video-audio signal receiving interface (21) on motherboard, and respectively dispose the adapter that SMA head changes the F head, can make things convenient for the user that the antenna of SMA head is connected on the motherboard like this, if by the transmission of dwelling house cable tv coax, then the adapter by SMA head commentaries on classics F head can be advantageously connected on the cable tv coax.Wherein, SMA impedance is 50 ohm, F impedance is 75 ohm, the adapter that the SMA head changes the F head is that impedance is unmatched, can cause the port reflection loss when transmitting by the dwelling house cable tv coax like this, but the decay that this loss causes does not influence the normal transmission of this radiofrequency signal in cable tv coax.
Wherein, for making things convenient for the conversion between wireless transmission and the wire transmission, can also be connected by a mask switch or connector between the video-audio signal transmission interface (13) of described dispensing device (1) and its antenna, be connected by a mask switch or connector between the video-audio signal receiving interface (21) of described receiving system (2) and its antenna.
Wherein, ensure in the time of for audio-visual transmission that the user normally uses cable TV, the coaxial cable that originally connects television set or cable set top box is connected to the input of an one-to-two distributor earlier, an output of distributor connects television set or cable set top box again, another output connects the coaxial cable interface of dispensing device (1), dispensing device (1) just can be transferred to indoor cable tv coax online the video-audio signal after the modulation like this, in order to reduce user cost and conveniently to install and use, be integrated with the distributor of an one-to-two in the described dispensing device (1), and only input port and the output port with this distributor places outside the casing, and video-audio signal transmission interface (13) is connected to another output port.
Same quadrat method wherein, is integrated with the distributor of an one-to-two in the described receiving system (2), and only input port and an output port of this distributor is placed outside the casing, and video-audio signal receiving interface (21) is connected to another output port.
The purpose of the distributor of integrated one-to-two is video-audio signal will be sent on the indoor CATV-cable network, and again it is received, for this reason, can further be improved to: wherein, be equipped with two coaxial fittings on the casing of described dispensing device (1), and the inner wire holding wire of this butt joint directly links to each other in dispensing device (1) inside, and this butt joint altogether, and video-audio signal transmission interface (13) is with signal coupling or directional couple or be connected on the inner wire holding wire of this butt joint.
Equally, wherein, be equipped with two coaxial fittings on the casing of described receiving system (2), and the inner wire holding wire of this butt joint directly links to each other in receiving system (2) inside, and this butt joint altogether, and video-audio signal receiving interface (21) comes out signal extraction from the inner wire holding wire of this butt joint with coupling or directional couple or ways of connecting.
As shown in Figure 2, wherein, dispensing device (1) also comprises a remote signal output interface (14) and a remote signal receiving interface (16), and receiving system (2) also comprises a remote signal transmission interface (24) and a remote signal input interface (26); Remote signal from audio-visual source device remote controller is input to remote signal input interface (26), enter into remote signal transmission interface (24) by this interface, send to remote signal receiving interface (16) by this interface, enter into remote signal output interface (14) by this interface, output to audio-visual source device and this equipment is carried out remote control by this interface, thus the reverse transfer of realization remote signal.
Wherein, remote signal output interface (14) is the infrared ray output interface, and remote signal input interface (26) is the infrared ray input interface.
Wherein, remote signal transmission interface (24) and remote signal receiving interface (16) be by coaxial cable transmission remote signal, and transmit used frequency more than 1000MHz, and to transmit used frequency range different with video-audio signal; Because radiofrequency signal filtered device filtering when going out the family that 1000MHz is above, therefore, not can with the remote signal mutual interference mutually of neighboring user.
Wherein, video-audio signal transmission interface (13) is connected on the coaxial cable by a duplexer with remote signal receiving interface (16), and video-audio signal receiving interface (21) also is connected on the coaxial cable by a duplexer with remote signal transmission interface (24).
As shown in Figure 3, in receiving system (2), increase the coding module (25) of a remote signal, and in dispensing device (1), increase the decoder module (15) of a remote signal simultaneously; Remote signal input interface (26) is connected to coding module (25), coding module (25) is connected to remote signal transmission interface (24), remote signal receiving interface (16) is connected to decoder module (15), and decoder module (15) is connected to remote signal output interface (14); Remote signal from audio-visual source device remote controller is input to remote signal input interface (26), enter into coding module (25) by this interface, behind coding, enter into remote signal transmission interface (24), send to remote signal receiving interface (16) by this interface, enter into decoder module (15) by this interface, after decoding, enter into remote signal output interface (14), output to audio-visual source device and this equipment is carried out remote control by this interface, thus the reverse transfer of realization remote signal.
Wherein, remote signal transmission interface (24) and remote signal receiving interface (16) be by cable tv coax transmission remote signal, and transmit used frequency on the isolation frequency range between the television channel or 1000MHz with other interior idle uhf bands on.
Wherein, remote signal transmission interface (24) and remote signal receiving interface (16) are a pair of line carrier communication interface.
Wherein, remote signal transmission interface (24) and remote signal receiving interface (16) are a pair of less radio-frequency or coaxial cable communication interface, its communication frequency at 1MHz within the 1000GHz scope, its communication modulation system be selected from FM, AM, PM, FSK, ASK, PSK, QFSK, QAM, QPSK, GFSK, frequency hopping, FDM, OFDM, DS-CDMA one of them.
Wherein, remote signal transmission interface (24) and remote signal receiving interface (16) twireless radio-frequency communication frequency are 315MHz or 433.92MHz, and the transmitter/receiver circuit of wherein said twireless radio-frequency communication interface is ultra-audio circuit or superheterodyne circuit.
Wherein, decoder module (15) and coding module (25), their example, in hardware is the combination in any that is selected from MCU, CPU, FPGA, SOC chip, coding special chip, special-purpose asic chip one of them or they.
Wherein, store the binary number of at least one identical bit position in coding module (25) and the decoder module (15), include this binary number in the remote signal through coding module (25) coding, binary number and the binary number of oneself storing after decoder module (15) is relatively encoded when decoding in the remote signal, if it is inequality, then abandon this remote signal, if identical then with remote signal decoding and be input to remote signal output interface (14).
The example, in hardware that wherein said binary number is saved in decoder module (15) and coding module (25) is the combination in any that is selected from the floating sky of ROM, EPROM, EEPROM, Flash, ultraviolet erasable ROM, IC-card, magnetic medium, chip pin or high level or low level, wire jumper, fly line, tangent line one of them or they.
Wherein, on dispensing device (1) and receiving system (2), respectively increase by one to the sign indicating number button, when on the dispensing device (1) to sign indicating number button (19) by after being clicked, dispensing device (1) just enters into accepting state, prepare to receive described binary number, at this moment, when on the receiving system (2) to sign indicating number button (29) by after being clicked, the coding module (25) of receiving system (2) just generates a described binary number at random, earlier with its preservation, send by remote signal transmission interface (24) with being about to it, the dispensing device (1) that is in accepting state receives this random binary number by remote signal receiving interface (16), and just withdraws from the state that receives binary number after by decoder module (15) it being preserved.
Wherein, the signal format after remote signal is encoded through coding module (25) is: lead code, described binary number are as address code, remote signal, end code; Decoder module (15) judges whether lead code is correct earlier when the described signal of decoding, if it is incorrect, then continue to wait for correct lead code, if lead code is correct, if the binary number of then comparing the address code in the signal and oneself preserving incorrect, then no longer continue decoding and enters the state of waiting for correct lead code, if correct, then remote signal output interface (14) is taken out and be input to remote signal.
Wherein, the decoder module (15) of same dispensing device (1) can preserve 2 with more than 2 from the described binary number of different receiving systems (2), when decoder module (15) decoding during from the remote signal of receiving system (2), just with these a plurality of binary numbers one by one with signal in address code relatively, if any one comparative result equates, then,, then remote signal is not exported if neither one is equal with remote signal output.
The utility model provides a kind of audio-visual technical scheme of transmission of stable, reliable, no adjacent co-channel interference, it has effectively utilized the inner existing cable tv coax wiring of dwelling house, the decoration that can not destroy user's dwelling house is attractive in appearance, and further provide a kind of wire and wireless dual-purpose technical scheme, further facilitated user's transmitting audio-video signal, further, the technical scheme of the reverse transfer of remote signal is provided, and carry out the technical scheme of coding and decoding when reverse transfer is provided, can effectively prevent the adjacent interference and the malice remote control of remote signal.
Description of drawings:
Fig. 1: the conceptual schematic drawing that utilizes the inner existing cable tv coax wiring of dwelling house transmitting audio-video signal;
Fig. 2: the conceptual schematic drawing of the coaxial cable transmitting audio-video signal of band remote control passback;
Fig. 3: the conceptual schematic drawing that carries out the coaxial cable transmitting audio-video signal of coding and decoding when remote signal is returned;
Fig. 4: known a kind of wireless image-sound transmission plan with the remote signal passback;
Fig. 5: known AV line directly transmits and twisted-pair feeder transmitting audio-video scheme;
Fig. 6: utilize first of the inner existing cable tv coax wiring of dwelling house transmitting audio-video signal to implement illustration;
Fig. 7: first of external radio electricity antenna is implemented illustration;
Fig. 8: the dispensing device figure of second embodiment;
Fig. 9: the receiving system figure of second embodiment.
Figure 10: the dispensing device of the 3rd embodiment and receiving system figure.
Embodiment:
Below be illustrated by three preferred embodiments and conjunction with figs., when the purpose of this utility model easier to understand, technology contents, technical characterictic and the effect reached.
First embodiment of the present utility model, as Fig. 6, shown in Figure 7, this audio and video transmitting set comprises at least one dispensing device (1), at least one receiving system (2), a filter is serially connected on the house lead in;
As Fig. 6, shown in Figure 7, in each dispensing device (1):
Video-audio signal input interface (11) is the input interface of one one tunnel composite video signal and binaural audio signal;
Radio-frequency modulator (12) is modulated to 2.4GHz with video-audio signal, and one 4 channel button (132) is arranged on it, can select 4 carrier wave channels;
Video-audio signal transmission interface (13) is a coaxial cable connector, and it can be SMA female or F female, can connect cable tv coax or external antenna;
Wherein, video-audio signal input interface (11) is connected to radio-frequency modulator (12), and radio-frequency modulator (12) is connected to video-audio signal transmission interface (13);
As Fig. 6, shown in Figure 7, in each receiving system (2):
Video-audio signal receiving interface (21) is a coaxial cable connector, and it can be SMA female or F female, can connect cable tv coax or external antenna;
Radio-frequency (RF) demodulator (22) is demodulated into video-audio signal with the radiofrequency signal of 2.4GHz, and one 4 channel button (212) is arranged on it, has 4 carrier wave channels to select;
Video-audio signal output interface (23) is the output interface of one one tunnel composite video signal and binaural audio signal;
Wherein, video-audio signal receiving interface (21) is connected to radio-frequency (RF) demodulator (22), and radio-frequency (RF) demodulator (22) is connected to video-audio signal output interface (23);
Wherein, radio-frequency modulator (12) and the used modulation system of radio-frequency (RF) demodulator (22) are the FM modulation.
Wherein audio-visual transmission can also can be selected wireless transmission in transmission over coaxial cable:
1. as shown in Figure 6, dwelling house cable tv coax transmission: the video-audio signal input interface (11) that is input to dispensing device (1) from one tunnel composite video signal Video of audio-visual source device and binaural audio signal Audio_L and Audio_R, through radio-frequency modulator (12) video-audio signal is modulated to the radio frequency of 2.4GHz, this radiofrequency signal sends on the dwelling house cable tv coax by the coaxial cable connector of video-audio signal transmission interface (13); The coaxial cable connector of the video-audio signal receiving interface (21) of receiving system (2) also is connected on the dwelling house cable tv coax, it is reduced into video-audio signal and signal is outputed to audio-visual playback equipment by video-audio signal output interface (23) by radio-frequency (RF) demodulator (22) after receiving this radiofrequency signal; Channel switches using method: use 4 channel buttons, have 4 to dial key, default channel 1 state that all is in pushes the ON state with certain group key and promptly represents to select this channel, and the transmission of video-audio signal receives must be in same channel; For preventing that video-audio signal from going out dwelling house from the house lead in reverse transfer, can on house lead in, be connected in series the low pass filter of a 1000MHz, can filter the above signal of 1000MHz, the radiofrequency signal that is used for the 2.4GHz of audio-visual transmission so just can not be transferred to abutting residence user and outdoor coaxial cable distribution net by coaxial cable, can effectively prevent the co-channel interference between adjacent.
2. as shown in Figure 7, external radio electricity antenna transmission: the external antenna of plugging on the coaxial cable connector with video-audio signal transmission interface (13), the external antenna of also plugging on the coaxial cable connector of video-audio signal receiving interface (21) simultaneously, like this by radio at 2.4GHz band transmissions video-audio signal.
Owing to can have 4 channels to select during the video-audio signal transmission, therefore can there be 4 dispensing devices (1) to send 4 tunnel different video-audio signals simultaneously, any a plurality of receiving systems (2) can receive the video-audio signal of any one channel in 4 channels.
Like this, for the user, more kinds of selections are arranged, wire transmission is convenient, stable, safety, and wireless transmission is installed the convenient television set that is fit to not have coaxial cable to arrive and used.
Second embodiment of the present utility model: as Fig. 8, shown in Figure 9, this audio and video transmitting set comprises at least one dispensing device (1), at least one receiving system (2), and wired coaxial cable comprises that also a filter is serially connected on the house lead in when transmitting;
As shown in Figure 8, in each dispensing device (1):
Video-audio signal input interface (11) is the input interface of one one tunnel composite video signal and binaural audio signal;
Radio-frequency modulator (12) is modulated to 2.4GHz with video-audio signal, and one 4 channel button (132) is arranged on it, can select 4 carrier wave channels;
Video-audio signal transmission interface (13) is a coaxial cable connector, and it can be SMA female or F female, can connect cable tv coax or external antenna;
Remote signal output interface (14) is an infrared module (141), decoded remote signal is modulated into infra-red carrier launches;
Decoder module (15) is a MCU and an EEPROM and necessary peripheral circuit (151), and it is decoded according to address code to the remote signal after encoding;
Remote signal receiving interface (16) is a wireless ASK receiver module of superhet (161) and antenna, and its frequency is 433.92MHz;
One to sign indicating number button (19), are connected to decoder module (15);
Wherein, video-audio signal input interface (11) is connected to radio-frequency modulator (12), radio-frequency modulator (12) is connected to video-audio signal transmission interface (13), and remote signal receiving interface (16) is connected to decoder module (15), and decoder module (15) is connected to remote signal output interface (14);
As shown in Figure 9, in each receiving system (2):
Video-audio signal receiving interface (21) is a coaxial cable connector, and it can be SMA female or F female, can connect cable tv coax or external antenna;
Radio-frequency (RF) demodulator (22) is demodulated into video-audio signal with the radiofrequency signal of 2.4GHz, and one 4 channel button (212) is arranged on it, has 4 carrier wave channels to select;
Video-audio signal output interface (23) is the output interface of one one tunnel composite video signal and binaural audio signal;
Remote signal transmission interface (24) is a wireless ASK transmitter module of superhet (241) and antenna, and its frequency is 433.92MHz;
Coding module (25) is a MCU and an EEPROM and necessary peripheral circuit (251), and it is encoded according to address code to remote signal;
Remote signal input interface (26) is an integrated infrared ray receiver module (261), and it is reduced into the Transistor-Transistor Logic level signal with the infrared remote control signal demodulation;
One is connected to coding module (25) to sign indicating number button (29);
Wherein, video-audio signal receiving interface (21) is connected to radio-frequency (RF) demodulator (22), radio-frequency (RF) demodulator (22) is connected to video-audio signal output interface (23), and remote signal input interface (26) is connected to coding module (25), and coding module (25) is connected to remote signal transmission interface (24).
As Fig. 8 and shown in Figure 9, the groundwork flow process of this audio and video transmitting set is divided into three parts:
1. the forward workflow of video-audio signal, video-audio signal transmission can be selected dwelling house cable tv coax or external radio electricity antenna for use:
I. dwelling house cable tv coax transmission: the video-audio signal input interface (11) that is input to dispensing device (1) from one tunnel composite video signal Video of audio-visual source device and binaural audio signal Audio_L and Audio_R, through radio-frequency modulator (12) video-audio signal is modulated to the radio frequency of 2.4GHz, this radiofrequency signal sends on the dwelling house cable tv coax by the coaxial cable connector of video-audio signal transmission interface (13); The coaxial cable connector of the video-audio signal receiving interface (21) of receiving system (2) also is connected on the dwelling house cable tv coax, it is reduced into video-audio signal and signal is outputed to audio-visual playback equipment by video-audio signal output interface (23) by radio-frequency (RF) demodulator (22) after receiving this radiofrequency signal; Channel switches using method: use 4 channel buttons, have 4 to dial key, default channel 1 state that all is in pushes the ON state with certain group key and promptly represents to select this channel, and the transmission of video-audio signal receives must be in same channel; For preventing that video-audio signal from going out dwelling house from the house lead in reverse transfer, can on house lead in, be connected in series the low pass filter of a 1000MHz, can filter the above signal of 1000MHz, the radiofrequency signal that is used for the 2.4GHz of audio-visual transmission so just can not be transferred to abutting residence user and outdoor coaxial cable distribution net by coaxial cable, can effectively prevent the co-channel interference between adjacent.
Ii. external radio electricity antenna transmission: the external antenna of plugging on the coaxial cable connector with video-audio signal transmission interface (13), the external antenna of also plugging on the coaxial cable connector of video-audio signal receiving interface (21) simultaneously, like this by radio at 2.4GHz band transmissions video-audio signal.
Remote control part to the sign indicating number workflow: on dispensing device (1) to sign indicating number button (19) when being pressed, dispensing device (1) just enters into accepting state, prepare to receive the binary address sign indicating number of 16 bit, at this moment, on receiving system (2) to sign indicating number button (29) when being pressed, the coding module (25) of receiving system (2) just generates the binary address sign indicating number of 16 bit at random, earlier with its preservation, send by remote signal transmission interface (24) with being about to it, the dispensing device (1) that is in accepting state receives this random binary address code by remote signal receiving interface (16), and just withdrawing from the state that receives the binary address sign indicating number after by decoder module (15) it being preserved, 10 seconds kinds of flicker that can produce a LED lamp are simultaneously correctly finished sign indicating number with prompting.
3. the reverse operation flow process of remote signal: as Fig. 8 and shown in Figure 9, when the infrared ray remote controller behind receiving system (2) emission infrared signal, integrated infrared ray receiver module (261) just is reduced into the high-low level signal with this signal, this signal is encoded according to address stored sign indicating number among the user EEPROM by coding circuit (251), the signal format of remote signal after through coding is: lead code, described binary number be as address code, remote signal, end code, and the wireless carrier through the 433.92MHz of remote signal transmission interface (24) behind the coding is launched; The remote signal receiving interface (16) of dispensing device (1) is reduced into it high-low level signal and signal is imported decoding circuit (151) after receiving this wireless carrier, decoding circuit (151) judges whether lead code is correct earlier when the described signal of decoding, if it is incorrect, then continue to wait for correct lead code, if lead code is correct, then compare address code and the binary number that oneself is kept among the EEPROM in the signal, if it is incorrect, then no longer continue decoding and enter the state of waiting for correct lead code, if it is correct, then remote signal is taken out, and launch, thereby control audio-visual source device by integrated infrared module (141).
Because dispensing device (1) needs to compare address code wherein after receiving radio remote-controlled signal, if address code is correct, it could be reduced into infrared signal, just can not reduce as if incorrect, therefore, can't correctly not communicate by letter with receiving system (2) to the dispensing device (1) of crossing sign indicating number, because be not 1/2^16*100%=0.001526% to dispensing device (1) and the equal probability of their address code of receiving system (2) of crossing sign indicating number, if then the possibility of address code repeated code is just lower to improve the bit figure place to 32 of address code even 48, even repeated code occurs, can also be by once more sign indicating number being made address code randomly changing again, so just reached the purpose that the utility model prevents the remote signal adjacent interference, because address code generates at random, can not exist the address code of a large number of users identical, the wireless remote control signal of also just having avoided a malice with broadcast mode just can the remote control a large number of users the safety problem of audio-visual source device.
Certainly, in order further to simplify production procedure, can be when the burned-in address sign indicating number simultaneously that address code is directly burned in the EEPROM of dispensing device (1) and receiving system (2), when saving production to the code stream journey, perhaps to sign indicating number work transfer to the consumer and do in use.
In addition, in order to support remote signal transmission multi-to-multi and one-to-many and many-to-one working condition, we can allow storage multiple sets of address sign indicating number in the dispensing device (1), and when decoding, the address code in this multiple sets of address sign indicating number and the signal is compared one by one, as long as have one more correct, just remote signal is reduced into infrared signal, so just can supports multi-to-multi, one-to-many and the many-to-one work of dispensing device (1) and receiving system (2) remote signal.
Owing to can have 4 channels to select during the video-audio signal transmission, therefore can there be 4 dispensing devices (1) to send 4 tunnel different video-audio signals simultaneously, any a plurality of receiving systems (2) can receive the video-audio signal of any one channel in 4 channels.
In the present embodiment, the coaxial cable connector of video-audio signal transmission interface (13) and video-audio signal receiving interface (21) can be selected coaxial cable transmission and wireless aerial transmission flexibly, for the user, more kinds of selections are arranged, wire transmission is convenient, stable, safety, and wireless transmission is installed the convenient television set that is fit to not have coaxial cable to arrive and used.
The 3rd embodiment of the present utility model, as shown in figure 10, this audio and video transmitting set comprises at least one dispensing device (1), at least one receiving system (2), a filter is serially connected on the house lead in;
As shown in figure 10, in each dispensing device (1):
Video-audio signal input interface (11) is the input interface of one one tunnel composite video signal and binaural audio signal;
Radio-frequency modulator (12) is modulated to 2.4GHz with video-audio signal, and one 4 channel button (132) is arranged on it, can select 4 carrier wave channels;
Video-audio signal transmission interface (13) is a coaxial cable connector, and it can be SMA female or F female;
Remote signal output interface (14) is an infrared module (141), decoded remote signal is modulated into infra-red carrier launches;
Remote signal receiving interface (16) is a radio-frequency (RF) demodulator and coaxial cable connector, remote signal demodulation after it will be modulated reduction, but with the 2.4GHz of video-audio signal not in same frequency range, its connector can be SMA female or F female;
Wherein, video-audio signal input interface (11) is connected to radio-frequency modulator (12), and radio-frequency modulator (12) is connected to video-audio signal transmission interface (13), and remote signal receiving interface (16) is connected to remote signal output interface (14);
As shown in figure 10, in each receiving system (2):
Video-audio signal receiving interface (21) is a coaxial cable connector, and it can be SMA female or F female;
Radio-frequency (RF) demodulator (22) is demodulated into video-audio signal with the radiofrequency signal of 2.4GHz, and one 4 channel button (212) is arranged on it, has 4 carrier wave channels to select;
Video-audio signal output interface (23) is the output interface of one one tunnel composite video signal and binaural audio signal;
Remote signal transmission interface (24) is a radio-frequency modulator and coaxial cable connector, and it is modulated to frequency range more than the 1000MHz with remote signal, but with the 2.4GHz of video-audio signal not in same frequency range, its connector can be SMA female or F female;
Remote signal input interface (26) is an integrated infrared ray receiver module (261), and it is reduced into the Transistor-Transistor Logic level signal with the infrared remote control signal demodulation;
Wherein, video-audio signal receiving interface (21) is connected to radio-frequency (RF) demodulator (22), and radio-frequency (RF) demodulator (22) is connected to video-audio signal output interface (23), and remote signal input interface (26) is connected to remote signal transmission interface (24).
As shown in figure 10, the groundwork flow process of this audio and video transmitting set is divided into the two large divisions:
1. the forward workflow of video-audio signal: the video-audio signal input interface (11) that is input to dispensing device (1) from one tunnel composite video signal Video of audio-visual source device and binaural audio signal Audio_L and Audio_R, through radio-frequency modulator (12) video-audio signal is modulated to the radio frequency of 2.4GHz, this radiofrequency signal sends on the dwelling house cable tv coax by the coaxial cable connector of video-audio signal transmission interface (13); The coaxial cable connector of the video-audio signal receiving interface (21) of receiving system (2) also is connected on the dwelling house cable tv coax, it is reduced into video-audio signal and signal is outputed to audio-visual playback equipment by video-audio signal output interface (23) by radio-frequency (RF) demodulator (22) after receiving this radiofrequency signal; Channel switches using method: use 4 channel buttons, have 4 to dial key, default channel 1 state that all is in pushes the ON state with certain group key and promptly represents to select this channel, and the transmission of video-audio signal receives must be in same channel; For preventing that video-audio signal from going out dwelling house from the house lead in reverse transfer, can on house lead in, be connected in series the low pass filter of a 1000MHz, can filter the above signal of 1000MHz, the radiofrequency signal that is used for the 2.4GHz of audio-visual transmission so just can not be transferred to abutting residence user and outdoor coaxial cable distribution net by coaxial cable, can effectively prevent the co-channel interference between adjacent.
2. the reverse operation flow process of remote signal: as shown in figure 10, when the infrared ray remote controller behind receiving system (2) emission infrared signal, integrated infrared ray receiver module (261) just is reduced into the high-low level signal with this signal, by remote signal transmission interface (24) radio frequency band and the process coaxial connector that it is modulated to 1000MHz is sent on the coaxial cable; The remote signal receiving interface (16) of dispensing device (1) is from being reduced into the high-low level signal with it after coaxial cable receives this radiofrequency signal and signal is launched by integrated infrared module (141), thereby controls audio-visual source device.
Owing to can have 4 channels to select during the video-audio signal transmission, therefore can there be 4 dispensing devices (1) to send 4 tunnel different video-audio signals simultaneously, any a plurality of receiving systems (2) can receive the video-audio signal of any one channel in 4 channels.
Because remote signal is also by coaxial frequency transmission more than 1000MHz, 1000MHz is with upper frequency filtered again device filtering when oppositely going out the family, therefore need not consider adjacent interference, the reverse transfer of remote signal just need not Code And Decode like this, further simplified design, also need not make things convenient for use during use to sign indicating number, and remote signal still can multi-to-multi, one-to-many and many-to-one transmission.
In the present embodiment, video-audio signal and remote signal all adopt the transmission of dwelling house cable tv coax, signal stabilization, no co-channel interference, utilize existing cable tv coax wiring, it is attractive in appearance can not destroy the dwelling house decoration, support 4 tunnel different video-audio signals to transmit simultaneously, greatly facilitate the user with various video-audio signals such as DVD video-audio signal, the top box of digital machine video-audio signal, the audio-visual model of satellite receiver, the IPTV video-audio signal is in the transmission of premises, make to be positioned at not many TVs of chummery and can to receive and play these video-audio signals, and can these audio-visual devices of remote control.
The above is preferred embodiment of the present utility model only, is not to be used for limiting the scope that the utility model is implemented.So all equalizations of doing according to the described shape of the utility model claim, structure, feature and spirit change and modify, and all should be included in the claim of the present utility model.
Further disclose:
The form and the interface mode of the video-audio signal of supporting about video-audio signal input interface (11), wherein the form of signal of video signal and interface mode include but not limited to: composite video input RCA, the input of S-Video video, the input of video aberration, VGA input, DVI input, and wherein the form of voice signal and interface include but not limited to: the voice signal behind analoging sound signal and the digital sampling quantization encoding;
Comprise a video conversion circuit in the video-audio signal input interface (11), this circuit can change the VGA input signal into composite video input signal, perhaps this circuit can change the DVI input signal into composite video input signal, or this circuit can change the video color difference input signal into composite video input signal, or this circuit can change the S-Video video input signals into composite video input signal, or this circuit can be imported RCA with composite video, the input of S-Video video, the input of video aberration, the VGA input, existing various video interfaces such as DVI input and form are changed mutually; In addition, also can comprise a video conversion circuit in the video-audio signal output interface (12), it may be a kind of in above-mentioned any video conversion circuit;
Remote signal transmission interface (24) and remote signal receiving interface (16) are a pair of radio communication or coaxial cable interface, the frequency that this docking port uses is any carrier frequency point in comprising from 1MHz to 1000GHz, especially comprise 290MHz to 350MHz, 310MHz to 440MHz, 380MHz is to 450MHz, 850MHz to 930MHz and 315MHz wherein and 433MHz, and the quantity of its operable carrier frequency point can be one or more, especially one; This can also adopt spread spectrum technic to wireless communication interface in addition;
Remote signal transmission interface (24) and remote signal receiving interface (16) are a pair of line carrier communication interface, this docking port is made up of power line carrier modulation module and power line carrier demodulation module and peripheral circuit thereof, and its employed power line carrier modulation baud rate can be in from 100Hz to 100GHz any baud rate especially 1KHz to the baud rate of 100KHz; This can also adopt spread spectrum technic to line carrier communication interface in addition.
Claims (14)
1. an audio and video transmitting set is made up of dispensing device (1) and receiving system (2);
Wherein, dispensing device (1) is made up of a motherboard and power supply and casing, power supply is connected to motherboard, motherboard places casing inside, be equipped with video-audio signal input interface (11), radio-frequency modulator (12) and video-audio signal transmission interface (13) on this motherboard, wherein, video-audio signal input interface (11) is connected to radio-frequency modulator (12), and radio-frequency modulator (12) is connected to video-audio signal transmission interface (13);
Wherein, receiving system (2) is made up of a motherboard and power supply and casing, power supply is connected to motherboard, motherboard places casing inside, be equipped with video-audio signal receiving interface (21), radio-frequency (RF) demodulator (22) and video-audio signal output interface (23) on this motherboard, wherein, video-audio signal receiving interface (21) is connected to radio-frequency (RF) demodulator (22), and radio-frequency (RF) demodulator (22) is connected to video-audio signal output interface (23);
Wherein, be input to the video-audio signal input interface (11) of dispensing device (1) from the video-audio signal of audio-visual source device, through being modulated to radiofrequency signal behind the radio-frequency modulator (12), passing through video-audio signal transmission interface (13) again sends on the transmission medium, the video-audio signal receiving interface (21) of receiving system (2) receives this radiofrequency signal from transmission medium, be demodulated into video-audio signal through radio-frequency (RF) demodulator (22), pass through video-audio signal output interface (23) again and output to the video-audio signal playback equipment;
It is characterized in that:
Wherein, described transmission medium is a coaxial cable, described video-audio signal transmission interface (13) is a coaxial cable interface, described video-audio signal receiving interface (21) also is a coaxial cable interface, and described radio-frequency modulator (12) is modulated to radiofrequency signal more than the 1000MHz with video-audio signal, correspondingly, described radio-frequency (RF) demodulator (22) is operated in same frequency range with radio-frequency modulator (12), and this radiofrequency signal is demodulated to video-audio signal.
2. a kind of audio and video transmitting set according to claim 1 is characterized in that:
Wherein, video-audio signal transmission interface (13) and video-audio signal receiving interface (21) this coaxial cable interface all is connected or coupling or directional couple online to the cable tv coax of dwelling house inside.
3. a kind of audio and video transmitting set according to claim 2 is characterized in that:
Wherein, this audio and video transmitting set also comprises a filter, and this filter at least can the described radiofrequency signal of filtering, this filter serial connection or be socketed on the house lead in of dwelling house cable tv coax.
4. a kind of audio and video transmitting set according to claim 3 is characterized in that:
Wherein, described filter is the low pass filter of 1000MHz, and this filter can the above radiofrequency signal of two-way filtering 1000MHz.
5. a kind of audio and video transmitting set according to claim 1 is characterized in that:
Wherein, radio-frequency modulator (12) and the used modulation system of radio-frequency (RF) demodulator (22) are the FM modulation.
6. according to any described a kind of audio and video transmitting set of claim 1 to 5, it is characterized in that:
Wherein, dispensing device (1) be an independent electronic or one be integrated in various audio-visual source devices inner and with the attached electronic device of their common sources, casing; Wherein, described audio-visual source device is selected from video disc player, wired digital set-top box, IPTV set-top box, ground digital set-top box, satellite receiver, PC, CD-audio player, video tape recorder, DVR, digital camera, Digital Video, power amplifier and other can provide the equipment of video-audio signal.
7. according to any described a kind of audio and video transmitting set of claim 1 to 5, it is characterized in that:
Wherein, the radio frequency band that send to receive video-audio signal between described video-audio signal transmission interface (13) and the video-audio signal receiving interface (21) at 2.4GHz between the 2.4835GHz, and this communications band is divided into 4 to 10 sections, each section can transmission of one line signal of video signal and two-way or six road or eight tunnel audio signals as a channel.
8. according to any described a kind of audio and video transmitting set of claim 1 to 5, it is characterized in that:
Wherein, go up wireless aerial of increase, and go up wireless aerial of increase at the video-audio signal receiving interface (21) of described receiving system (2) at the video-audio signal transmission interface (13) of described dispensing device (1).
9. a kind of audio and video transmitting set according to claim 8 is characterized in that:
Wherein, refute by coaxial cable interface between the video-audio signal transmission interface (13) of described dispensing device (1) and its antenna and connect, refute by coaxial cable interface between the video-audio signal receiving interface (21) of described receiving system (2) and its antenna and connect.
10. a kind of audio and video transmitting set according to claim 9 is characterized in that:
Wherein, video-audio signal transmission interface (13) is SMA head or F head with the connector of video-audio signal receiving interface (21) on motherboard, and respectively disposes the adapter of a SMA head commentaries on classics F head for the SMA head.
11., it is characterized in that according to any described a kind of audio and video transmitting set of claim 1 to 5:
Wherein, dispensing device (1) also comprises a remote signal output interface (14) and a remote signal receiving interface (16), and receiving system (2) also comprises a remote signal transmission interface (24) and a remote signal input interface (26);
Remote signal from audio-visual source device remote controller is input to remote signal input interface (26), enter into remote signal transmission interface (24) by this interface, send to remote signal receiving interface (16) by this interface, enter into remote signal output interface (14) by this interface, output to audio-visual source device and this equipment is carried out remote control by this interface, thus the reverse transfer of realization remote signal.
12. a kind of audio and video transmitting set according to claim 11 is characterized in that:
Wherein, remote signal transmission interface (24) and remote signal receiving interface (16) be by coaxial cable transmission remote signal, and transmit used frequency more than 1000MHz, and to transmit used frequency range different with video-audio signal.
13. a kind of audio and video transmitting set according to claim 11 is characterized in that:
In receiving system (2), increase the coding module (25) of a remote signal, and in dispensing device (1), increase the decoder module (15) of a remote signal simultaneously; Remote signal input interface (26) is connected to coding module (25), coding module (25) is connected to remote signal transmission interface (24), remote signal receiving interface (16) is connected to decoder module (15), and decoder module (15) is connected to remote signal output interface (14);
Remote signal from audio-visual source device remote controller is input to remote signal input interface (26), enter into coding module (25) by this interface, behind coding, enter into remote signal transmission interface (24), send to remote signal receiving interface (16) by this interface, enter into decoder module (15) by this interface, after decoding, enter into remote signal output interface (14), output to audio-visual source device and this equipment is carried out remote control by this interface, thus the reverse transfer of realization remote signal.
14. a kind of audio and video transmitting set according to claim 13 is characterized in that:
Wherein, store the binary number of at least one identical bit position in coding module (25) and the decoder module (15), include this binary number in the remote signal through coding module (25) coding, binary number and the binary number of oneself storing after decoder module (15) is relatively encoded when decoding in the remote signal, if it is inequality, then abandon this remote signal, if identical then with remote signal decoding and be input to remote signal output interface (14).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520040778 CN2779764Y (en) | 2005-04-11 | 2005-04-11 | A video & audio transmission device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520040778 CN2779764Y (en) | 2005-04-11 | 2005-04-11 | A video & audio transmission device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2779764Y true CN2779764Y (en) | 2006-05-10 |
Family
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200520040778 Expired - Fee Related CN2779764Y (en) | 2005-04-11 | 2005-04-11 | A video & audio transmission device |
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| CN (1) | CN2779764Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102377088A (en) * | 2011-06-15 | 2012-03-14 | 北京天地融科技有限公司 | Audio signal receiving and transferring device |
| CN104969541A (en) * | 2013-01-08 | 2015-10-07 | 沃克斯国际有限公司 | Low profile ota antenna with wifi video streaming capability |
| TWI697815B (en) * | 2018-01-03 | 2020-07-01 | 鴻海精密工業股份有限公司 | Display apparatus architecture |
-
2005
- 2005-04-11 CN CN 200520040778 patent/CN2779764Y/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102377088A (en) * | 2011-06-15 | 2012-03-14 | 北京天地融科技有限公司 | Audio signal receiving and transferring device |
| WO2012171492A1 (en) * | 2011-06-15 | 2012-12-20 | 天地融科技股份有限公司 | Audio signal receiving and transferring device |
| CN104969541A (en) * | 2013-01-08 | 2015-10-07 | 沃克斯国际有限公司 | Low profile ota antenna with wifi video streaming capability |
| CN104969541B (en) * | 2013-01-08 | 2019-04-09 | 沃克斯国际有限公司 | Low section with WIFI dynamic image distribution ability downloads antenna in the air |
| TWI697815B (en) * | 2018-01-03 | 2020-07-01 | 鴻海精密工業股份有限公司 | Display apparatus architecture |
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Granted publication date: 20060510 |