CN1450726A - Short distance wireless tranmission method and system for audio and video signal in audio and video system - Google Patents
Short distance wireless tranmission method and system for audio and video signal in audio and video system Download PDFInfo
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Abstract
A short distance radio transmitting method and system for audio, video system image audi osignals characterizes in applying short distance radio emit/receiver method for transmitting audio, video signals therefore the system is added with an audio, video signal emitting source and its a receiving source for short distance radi otransmit related to each audio video signal source in which the emitting source input is connected with the output of the audio video signal source, the signal receiving source output receives video end and low frequency amplifier input, the signal receiving source receives the radio modulation signal from the emitting source to be recovered to acceptable signals by the video terminal and audio amplifier after demodulation.
Description
Technical field: the present invention relates to a kind of short-distance radio audio visual signal transmission technology (wire signal can be carried out the technology of wireless transmission) that is used for the home audio-visual system, particularly a kind of audio-visual system video-audio signal short distance wireless tranmission method and (emission and reception) system thereof of being used for.
Background technology: in modern society, family multi-media (computer) audio audio-visual equipments such as various home audios, multimedia computer, cable TV, video tape recorder, Laser disc machine have obtained greatly universal.These audio-visual devices all are to be formed through entire combination by the different individual equipment of a plurality of tasks (unit).Be born and 100 Shes of development since year in audio visual technology, because early stage technical restriction, cause people between family expenses audio-visual equipment inevitably design and installation various signal connecting lines, traditional connected mode of the signal transmission between the different audio-visual equipment of this solution is leveraged to the present always.For example the VCD video disc player must be connected on television set and the power amplifier stereo set with AV line or radio frequency line, DVD player must with the AV line be connected with television set around power amplifier, power amplifier then must be connected with audio amplifier with the audio amplifier line, be also noted that the said equipment is carried out correct lead to be connected, otherwise can't realize the broadcast of video-audio signal.For example multimedia computer has audio output port again, in the outfit during multimedia loudspeaker box, on corresponding connecting line must being pegged graft, could allow the multimedia loudspeaker box pronunciation, if do not establish wiring and grafting joint, then multimedia loudspeaker box can't be worked.Because the audio-visual equipment that existing manufacturer provides all needs to use connecting line, this tradition falls behind technology and has caused following many inconveniences of using: because of the connecting line limited length of general audio-visual equipment, causing these equipment to have to squeeze is placed on the narrow and small fixing position, be placed in the cabinet for TV as squeezing, in the stereo cabinet, place such as computer desk, the user is caused great inconvenience and restriction.Owing to need a large amount of connecting lines near the television acoustics cabinet, influenced the neat succinct beautiful visual effects (causing visual pollution) in room, because cabinet for TV and stereo cabinet are close to the wall seam, if connect or change connection line audio-visual equipment will be a very arduous thing, wanting to add or delete audio-visual equipment also will be the thing of a difficulty, as newly buying a DVD player, want the various connecting lines grafting of video disc player are put in place, will be with power amplifier, TV, even equipment such as DVD all takes out of, could correctly peg graft after seeing each port designations clearly, very difficulty.Because surround speaker need connect long connecting line to wall behind, will bring inconvenience to finishing and life.Too much long connecting line also will cause potential safety hazard, and this hidden danger might be electrical equipment aspect potential safety hazard, also may be the potential safety hazard of mechanical aspects.In addition, also two surround speakers can't or be difficult to ornaments in the multimedia loudspeaker box of 4.1 sound channels because multimedia computer in actual use, exists, and the multimedia main sound box is difficult to the constraint of separating computer table, can't bring into play the effect of surrounding sound field.Owing to too much numerous and diverse connecting line, want to change the position of home theater or multimedia computer again, sound system is moved position, a part stubborn problem only not.
In order to improve the adverse effect of above-mentioned some aspect, though have the people to design to be applicable to the use radio of active audio amplifier to replace " wire signal wireless launcher " (patent No. 96237263.3) of connecting line transmission signals.Other has a patent documentation to write down a kind of active audio amplifier (patent No. 95246215.x) that uses infrared ray to replace connecting line.Same also have a patent documentation that a kind of videocorder (patent No. 92228287.0) that has video-audio signal radio frequency spatial emission function is provided.The meeting that above-mentioned these technology have makes audio amplifier not have connecting line, it is necessarily convenient to bring the user, but its employed acoustic electronic link performance is inferior, can't be used among the high-performance sound system of current high-fidelity around the epoch, and there is not the video technique support, two sound channels are only arranged, and range of application is narrow.And cable TV wireless launcher and wireless video tape recorder are to the space purely with cable TV signal or video tape recorder radiofrequency signal power emission, its performance only satisfies general low-quality image and sound accompaniment, be not suitable for high-fidelity surround sound system and use, can not satisfy the requirement of existing high-quality high definition AV home theater.What deserves to be mentioned is in addition, though existing wireless headset has developed history decades, but wireless headset is individual dual track cerumen listens equipment, this technology still can not be used for products such as home theater, existing wireless monitor camcorder technology only provides transfer voice device and image transmitter of the low tonequality of monophony, can not be used for the high-fidelity home audio-visual system of home theater etc.
The objective of the invention is to overcome above-mentioned defective, thereby provide a kind of short distance wireless tranmission method and system thereof that is used for the audio-visual system video-audio signal, it can carry out short-distance radioization to wired audio-video signal and transmit and receive, when realizing the wireless penetration connection between the various audio-visual devices, guarantee that the audio-video signal quality can not be affected, and can satisfy the demand of modernized digital rings around multichannel, be suitable in comprising the various audio-video systems of home theater, using.
The present invention realizes with following technical scheme: with reference to Fig. 1, this system still comprises: a, can represent the audio-video signal source (1) of one or more signal source, its concrete equipment can comprise video tape recorder, VCD or DVD player, many groups such as multimedia computer audio visual signal source device, b, video terminal (2), its concrete equipment can be television set, projector, computer monitors etc. are with (terminal) equipment of the final reduction of vision signal, c. low frequency (audio frequency) amplifier (3), it specifically is meant the equipment that the weak audio signal of telecommunication rate of doing work of transmitting in the line can be amplified, such as power amplifying device, d. audio-frequency electric acoustical convertor (4), its concrete equipment can be that audio amplifier (loud speaker) etc. can be with the voice frequency signaling set of electrical signal conversion for being received by people's ear, its method feature is: the transmission method that all adopts short-distance radioization to transmit and receive the audio-video signal (video-audio signal) of high performance audio-video system that comprises home theater etc. and multimedia computer, to form a kind of emitting-receiving system of wireless penetration transmission, feasible demand or the requirement that can satisfy the Voice ﹠ Video of modern high-fidelity performance can also be satisfied modernized digital rings around the demand that also reaches 3 to 100 road multichannels.For this reason, short-distance radio transmission system of the present invention is characterised in that also and has additional: with the audio-video signal that is used for short range wireless transmission (wireless) emission source (also claiming audio-video signal wireless launcher or equipment) (5) of corresponding the setting in every audio-video signal source (1) (configuration), with the audio-video signal that is used to receive these wireless signals (wireless) reception sources (device or equipment) (6), audio-video signal emission source (5) device wherein can be radio amplitude modulation, frequency-modulated transmitter, also can be laser or infrared transmitter, the concrete signal of its emission can be the audio frequency and video analog signal, amplitude-modulation frequency-modulation signal, it maybe can also be the audio frequency and video modulated digital signal, (digital signal can be without overcompression, also can compress) through adopting compression device, its circuit connects: the output of audio-video signal source (1) is connected the input of (promptly being plugged on) audio-video signal emission source (5), signal emitting-source (5) is launched the signal that modulates again to the space open circuit, audio-video signal reception sources (6) device wherein can be radio amplitude modulation, fremodyne, it also can be digit receiver, also can also be laser or infrared receiver, the concrete signal of its reception can be the audio frequency and video analog signal, amplitude-modulation frequency-modulation signal, it maybe can also be the audio frequency and video modulated digital signal, (digital signal can be without overcompression, also can compress) through adopting compression device, its circuit connects: the output of audio-video signal reception sources (6) device connects into the input of (being plugged on) video terminal (2) and low frequency (audio frequency) amplifier (3) respectively, audio-video signal reception sources (6) can receive the audio-video wireless modulation signal of audio-video signal emission source (5) by the emission of spacing wireless open circuit, and this signal carried out respective handling (such as demodulation process), finally be reduced into the audio-video signal that video terminal (2) as terminal equipment and audio frequency amplifier (3) can be accepted: video terminal (2) is reduced into image with the vision signal that receives, be presented on the display screen, after the power amplification of audio frequency amplifier (3) with the audio electrical signal that receives, send in the audio-frequency electric acoustical convertor (4), finally be reduced into sound by it again and in the space, propagate.
Compared with the prior art, the present invention adopts the audio-video system wireless penetration scheme of above-mentioned home theater etc., can meet the following requirements; Can really satisfy the requirement of high-fidelity in the wireless transmission process of sound, the distortion factor is minimum, can guarantee that the audio-video signal quality can not be affected.Secondly, the number of channels of sound can satisfy the demand of various surround sound standards.Its three, the wireless transmission of video can guarantee the stable and high image quality of image, and enough definition are provided, non-prior art can be compared.In a word, use the technology of the present invention can accomplish to make VCD, the DVD of Modern Family wireless penetration to connect, the clear stereo video tape recorder can connect in wireless penetration, and main sound box can be connected with surround speaker in wireless penetration, even multimedia computer can realize also that with active audio amplifier wireless penetration is connected.After the present invention realizes split type home theater function, the benefit of its splitization will make the user greatly convenient in operation, and show: the user need not to leave the seat of oneself, promptly replaceable laser discsLD or video tape; The user can observe directly the information state that the display screen on the audio-visual equipment such as video disc player shows; If equipment selfs such as video disc player have the wireless receiving and dispatching source, the user need not any connecting line of pegging graft again except power line, and the interpolation of equipment and deletion action only are the plug power lines; Become split type home theater if will have device upgrade such as video disc player now, signal link is plugged into gets final product on the emission source, allow the combination of entire equipment and the assembly unit no longer be the just competent work of sound equipment expert; , need not the wall threading that punches is made indoor neat and tidy without any connecting line because of indoor; The multimedia computer audio amplifier can hang in any corner, room, not retrained by computer desk, and multimedia sound (sound) effect (really) of modern multichannel can be brought into play heartily; Because some is former thereby must move audiovisual system and will become convenient unusually.
The present invention also has following technical characterictic when specific design:
One, when the device as audio-video signal reception sources (6) is the radio fremodyne (with reference to Fig. 2, Fig. 3), then the audio-frequency unit of (6) comprising: reception antenna, high-frequency amplifier, audio frequency FM demodulator, and the video section of (6) comprising: antenna, high-frequency amplifier, the visual demodulator shared with audio-frequency unit.
Two, when as the device (equipment) of audio-video signal reception sources (6) when being digit receiver (with reference to Fig. 4), then (6) comprise reception antenna, wireless receiving demodulator, microprocessor (can be the microprocessing systems that has decompression) and DA transducer.
Three, when the concrete signal of its emission is the audio frequency and video modulated digital signal, these digital signals can be without overcompression, also can be to adopt the compression device compression, equally, when the concrete signal of its reception is the audio frequency and video modulated digital signal, these digital signals can also can be to adopt the compression device compression without overcompression accordingly also.
Four, described audio-video signal (wireless) emission source (5) can be the equipment that is plugged in an absolute construction of back, audio-video signal source (1), and have an independently casing, it also can be the part (and be used in combination with it same casing) in the audio-video signal source (1), and signal reception sources (6) equally also can be the equipment of an absolute construction, and have independently casing, also can combine and form same part respectively with video terminal (2) or audio frequency amplifier (3) and use same casing (accompanying drawing is slightly).
Above-mentioned with audio-video signal source (1) and signal emitting-source (5) in conjunction with and use same casing, do signal sources such as to make VCD of the present invention, DVD, digital VTR like this, itself have ability, go to allow signal reception sources (6) receive to the wireless transmission modulation signal of certain standard of space open circuit emission; And signal emitting-source (5) is independently made an equipment, and when having independently casing, will make original traditional-family cinema to peg graft and go up signal emitting-source (5) and signal reception sources (6), thereby upgrading becomes split type family cinema.In like manner, with signal reception sources (6) and video terminal (2) in conjunction with and use same casing, with signal reception sources (6) and audio frequency amplifier (3) in conjunction with and use same casing, can be so that the such audio-video terminal equipment of television set and power amplifier itself possess the signal that received signal emission source (5) is sent, and unnecessary other docking device; And signal reception sources (6) is independently made an equipment, and when having independently casing, will make original traditional-family cinema to peg graft and go up signal emitting-source (5) and signal reception sources (6), thereby upgrading becomes split type family cinema.
It below is the description of drawings (embodiments of the invention are not limited thereto) of several embodiment of the present invention.
Fig. 1 is a kind of way circuit theory diagram (circuit general diagram) of video-audio signal short-distance radio of the present invention transmission (emission receive) system.
Fig. 2 is that the multichannel audio of a cover home theater of the present invention utilizes the method for radio frequency modulation to realize the circuit block diagram (first kind of embodiment) of analogue radio transmissions.
In Fig. 2, (A1) wherein, (B1), (C1) be meant the audio-video signal source device, such as VCD, DVD player, video tape recorder etc., (11) wherein, (21), (31) be meant audio-video wireless transmitter module (rf modulations transmitter module) as signal emitting-source (5) usefulness, (41) be meant the receiver of heightening the frequency signal as the reception reconciliation of signal reception sources (6) usefulness, it comprises the shared high-frequency amplifier of audio frequency and video (41A), visual demodulator (41B) and audio signal demodulator (41C), (51) be audio frequency amplifier (low putting), (61) be television set, (71) are audio amplifiers.
Referring to Fig. 2, its operation principle is: in an audio-video signal source device, the audio-video signal that produces such as (A1) sends wireless transmitter module (11) to, (11) by antenna the audio frequency and video high-frequency carrier signal that modulates is gone out to spatial emission, be positioned at the vision signal that the radio signal receiver (41) of audio frequency amplifier casing comes out demodulation, be connected on the television set, make television set the image of (A1) occur, (41) audio signal of also demodulation being come out is connected to the input of audio frequency amplifier (51), (51) audio signal after will amplifying is delivered to the input of audio amplifier (71), makes audio amplifier send the sound of (A1).
Fig. 3 is that a kind of multimedia computer sound system of the present invention utilizes the wireless carrier frequency modulation method to realize the circuit block diagram (second kind of embodiment) of analogue radio transmissions.
In Fig. 3, A2 is a multimedia computer, (12) be meant audio signal wireless-modulated emitter as signal emitting-source (5) usefulness (audio signal can be modulated into the wireless carrier signal that is fit to spatial emission), (22) be to be contained in the same casing to stabilized voltage power supply (12) and (22) that (12) power, (32) be meant being used for receiving conciliating and heightening the receiver of signal frequently as signal reception sources (6) usefulness, it comprises high-frequency amplifier (32A) and audio signal demodulator (32B), (42) be power supply, (52) be the multimedia active audio amplifier, (32), (42), (52) can be in together in the casing, make this multimedia active audio amplifier itself have the ability of reception (12) emitted radio signal.Referring to Fig. 3, its operation principle is: open power supply, multimedia computer (A1) sends audio signal, and this signal is transported to the input of audio signal radio modulation emitter (12), and signal sends to the space after its modulation.Receiver (32) receive radio signal through frequency-selecting amplify to separate carry out demodulation and convert audio signal to after, corresponding sound channel signal (3 more than the sound channel) is flowed to multimedia active audio amplifier (52) sounds.
Fig. 4 is the circuit block diagram (for a kind of simple digitized audio frequency wireless transmission schemes, the third embodiment) of nothing compression (or compression is arranged) digital radio transmission of a kind of multichannel of the present invention (as 6 sound channels) audio frequency.
In Fig. 4, (A3) wherein, (B3), (C3), (D3), (E3), (F3) are meant the audio-video signal source device, (13) be AD sampling quantizer, (23) be microprocessor (can be the microprocessor system that has the digital compression ability), (33) be the wireless-modulated reflector, (43) be the wireless receiving demodulator, (53) be microprocessor (can be the microprocessor system that has digital solution compression ability), (63) be the DA transducer, (73) be filtering and buffering amplification system, (83) be low putting, (93) are audio amplifier (loud speakers).Referring to Fig. 4, its circuit working principle is as follows: digital radio reflector (33) utilizes AD sampling quantizer (13) to compare with the reference voltage source in the quantizer multichannel (as the 6 tunnel) simulated audio signal of input, draw the binary digit value, and this numeral is sent to microprocessor (23) by data/address bus, after microprocessor synthesizes processing (or compression) with these multiple signals through data, send into wireless-modulated reflector (33) by serial (also can by parallel) transmission, the wireless-modulated reflector utilizes a carrier wave (parallel also can utilize a plurality of carrier waves down) to carry out the digital signal emission.Digital radio receiving demodulation device (43) comes out serial (or parallel) digital demodulation signal that receives, send into microprocessor (53), microprocessor separates (or decompress(ion) separation) with these multichannel composite signals, and be dispensed to each DA transducer (63), the DA transducer becomes digital quantity into analog quantity output, the digital harmonic wave composition filtering that process multichannel (as 6 tunnel) filtering and buffering amplification system (73) will be harmful to, make waveform level and smooth, the trend with near after original signal waveform and the impedance conversion, send into multichannel (6 tunnel) low frequency amplifier (83) and carry out power amplification, send into multichannel (6 tunnel) audio amplifier (93) again and be reduced into voice signal.
Fig. 5 is the circuit block diagram (for a kind of simple video digitizer wireless transmission schemes, the 4th kind of embodiment) of the digital radio transmission of a kind of vision signal among the present invention.
In Fig. 5, radiating portion wherein comprises one tunnel (or multichannel) video signal input circuit (14), AD digital sampling quantizer (24), digital processing system (34), digital radio modulation device (44), HF transmitter (54) and transmitting antenna.Its receiving unit comprises reception antenna, (riches all the way penetrates under the device situation tunable high-frequency head (64) only having, also can use the tuner of fixed frequency), digital signal demodulator (74), digital processing system (84), DA digital simulation conversion system (94) (being the DA transducer), high frequency filter and video amplification system (104), its circuit working principle is as follows:
Radiating portion is input to vision signal to cushion in the video signal input circuit and amplifies and filtering, take a sample by the digital sampling quantizer again, draw the digital signal amount with reference voltage source after relatively, send into digital processing system and do the compression processing, digital signal after overcompression is sent into the digital radio modulation device, be modulated into and send into HF transmitter behind the high-frequency signal and carry out power amplification, send into the space through transmitting antenna.
The high-frequency signal that receiving unit receives antenna is sent into tuner, and (reflector is the tuner of one tunnel the fixed frequency used, reflector is a multichannel, when being arranged, uses by a plurality of reflector the tunable high-frequency head), the faint high-frequency signal that tuner will be imported amplifies, after doing respective handling, send into digital signal demodulator, send into digital processing system after demodulating digital signal, through decompression processing, send into digital simulation (DA) converting system and convert analog signal to, handle through amplification and amplitude behind High frequency filter and the harmful high-frequency harmonic of video amplification system filtering, thus the output receivable vision signal of TV (also can be color difference signal, the SVIDEO signal).
Two kinds of schemes of above-mentioned Fig. 4 and Fig. 5 can be interosculated and are combined into an equipment.
Claims (6)
1, a kind of short distance wireless tranmission method that is used for the audio-visual system video-audio signal, it is characterized in that comprising that with high performance the audio-video system of home theater etc. and the audio-video signal of multimedia computer are the transmission method that video-audio signal all adopts short-distance radioization to transmit and receive, to form a kind of emitting-receiving system of wireless penetration transmission, feasible demand or the requirement that can satisfy the Voice ﹠ Video of modern high-fidelity performance can also be satisfied modernized digital rings around the demand that also reaches 3 to 100 road multichannels.
2, a kind of short-distance radio transmission system that is used for the audio-visual system video-audio signal, this system comprises: a. can represent the audio-video signal source (1) of one or more signal source, its concrete equipment can comprise video tape recorder, VCD or DVD player, many groups such as multimedia computer audio visual signal source device, b. video terminal (2), its concrete equipment can be television set, projector, computer monitors etc. are with the terminal equipment of the final reduction of vision signal, c. low frequency amplifier (3), it specifically is meant the equipment that the weak audio signal of telecommunication rate of doing work of transmitting in the line can be amplified, such as power amplifying device, d. audio-frequency electric acoustical convertor (4), its concrete equipment can be that audio amplifier etc. can be with the voice frequency signaling set of electrical signal conversion for being received by people's ear, it is characterized in that this wireless penetration transmission system also has additional: corresponding audio-video signal emission source (5) that is used for short range wireless transmission that sets with every audio-video signal source (1) and the audio-video signal reception sources (6) that is used to receive these wireless signals, audio-video signal emission source (5) device wherein can be radio amplitude modulation, frequency-modulated transmitter, also can be laser or infrared transmitter, the concrete signal of its emission can be the audio frequency and video analog signal, amplitude-modulation frequency-modulation signal, it maybe can also be the audio frequency and video modulated digital signal, its circuit connects: the output of audio-video signal source (1) is connected the input of audio-video signal emission source (5), signal emitting-source (5) is launched the signal that modulates again to the space open circuit, audio-video signal reception sources (6) device wherein can be radio amplitude modulation, fremodyne also can be a digit receiver, also can also be laser or infrared receiver, the concrete signal of its reception can be the audio frequency and video analog signal, amplitude-modulation frequency-modulation signal, it also can also be the audio frequency and video modulated digital signal, its circuit connects: the output of audio-video signal reception sources (6) device inserts the input of video terminal (2) and low frequency amplifier (3) respectively, audio-video signal reception sources (6) can receive the audio-video wireless modulation signal of audio-video signal emission source (5) by the emission of spacing wireless open circuit, and this signal carried out respective handling, such as demodulation process, finally be reduced into the audio-video signal that video terminal (2) and audio frequency amplifier (3) can be accepted, video terminal (2) is reduced into image with the vision signal that receives and is presented on the display screen, after the power amplification of audio frequency amplifier (3) with the audio electrical signal that receives, send in the audio-frequency electric acoustical convertor (4) and be reduced into sound.
3, short-distance radio transmission system according to claim 2, it is characterized in that: when the device as audio-video signal reception sources (6) is the radio fremodyne, then the audio-frequency unit of this signal reception sources (6) comprises reception antenna, high-frequency amplifier, audio frequency FM demodulator, and the video section of signal reception sources (6) comprising: antenna, high-frequency amplifier, the visual demodulator shared with audio-frequency unit.
4, short-distance radio transmission system according to claim 2, it is characterized in that: when the device as audio-video signal reception sources (6) was digit receiver, this signal reception sources (6) then comprised reception antenna, wireless receiving demodulator, microprocessor and DA transducer.
5, short-distance radio transmission system according to claim 2, it is characterized in that when the concrete signal of its emission is the audio frequency and video modulated digital signal, these digital signals can be without overcompression, also can be to adopt the compression device compression, equally, when the concrete signal of its reception was the audio frequency and video modulated digital signal, these digital signals can also can be to adopt the compression device compression without overcompression accordingly also.
6, short-distance radio transmission system according to claim 2, it is characterized in that described audio-video signal emission source (5) can be the equipment that is plugged in an absolute construction of back, audio-video signal source (1), and have an independently casing, it also can be a part in the audio-video signal source (1), and be used in combination same casing with it, and signal reception sources (6) equally also can be the equipment of an absolute construction, and have independently casing, also can combine and form same part respectively with video terminal (2) or audio frequency amplifier (3) and use same casing.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021113238A CN100382453C (en) | 2002-04-07 | 2002-04-07 | Short distance wireless tranmission method and system for audio and video signal in audio and video system |
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| Application Number | Priority Date | Filing Date | Title |
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| CNB021113238A CN100382453C (en) | 2002-04-07 | 2002-04-07 | Short distance wireless tranmission method and system for audio and video signal in audio and video system |
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| CN1450726A true CN1450726A (en) | 2003-10-22 |
| CN100382453C CN100382453C (en) | 2008-04-16 |
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| CNB021113238A Expired - Fee Related CN100382453C (en) | 2002-04-07 | 2002-04-07 | Short distance wireless tranmission method and system for audio and video signal in audio and video system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103532624A (en) * | 2013-10-01 | 2014-01-22 | 东北电力大学 | Short-distance optical wireless voice frequency transmission device |
| CN107612579A (en) * | 2017-10-24 | 2018-01-19 | 盐城师范学院 | The interim wireless transmitting system of foreign language teaching multi-channel video signal |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2143034Y (en) * | 1992-07-18 | 1993-09-29 | 台湾三洋电机股份有限公司 | Video recorder and player with wireless transmitter |
| CN2250615Y (en) * | 1995-11-16 | 1997-03-26 | 广州雅刚实业有限公司 | infrared wireless loudspeaker box |
| CN2271079Y (en) * | 1996-07-30 | 1997-12-17 | 张弦 | Wireless transmitter for transmitting wire signal |
-
2002
- 2002-04-07 CN CNB021113238A patent/CN100382453C/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103532624A (en) * | 2013-10-01 | 2014-01-22 | 东北电力大学 | Short-distance optical wireless voice frequency transmission device |
| CN107612579A (en) * | 2017-10-24 | 2018-01-19 | 盐城师范学院 | The interim wireless transmitting system of foreign language teaching multi-channel video signal |
Also Published As
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| CN100382453C (en) | 2008-04-16 |
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