CN103841521A - Wireless digital conference system based on 2.4G - Google Patents
Wireless digital conference system based on 2.4G Download PDFInfo
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- CN103841521A CN103841521A CN201210479796.4A CN201210479796A CN103841521A CN 103841521 A CN103841521 A CN 103841521A CN 201210479796 A CN201210479796 A CN 201210479796A CN 103841521 A CN103841521 A CN 103841521A
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Abstract
The invention belongs the field of wireless technology and particularly relates to a wireless digital conference system based on a 2.4G technology. The system includes at least one extension set, and a host and a chairman machine, which are used compatibly. The extension sets, the host and the chairman machine each includes an AVR microprocessor, and a speech coding circuit and a 2.4G transceiving circuit, which are in matched connection with the AVR microprocessor. The host and the chairman machine are each in matched connection with a power-supply management circuit. Each extension set includes an LCD indication circuit connected with a corresponding AVR microprocessor. The host also includes a data transceiving circuit connected with the AVR microprocessors, and audio receiving modules, the number of which is corresponding to that of the extension sets. The audio receiving modules and the data receiving circuit are connected with 2.4G input amplification circuits respectively. The audio receiving modules are also connected with array reverberation elimination devices or/and array reverberation elimination inhibiting devices. The wireless digital conference system based on the 2.4G technology is clear in voice, high in reproduction fidelity and capable of reducing inter-signal interferences.
Description
Technical field
The invention belongs to wireless technical field, relate in particular to a kind of radio digital conference system based on 2.4G.
Background technology
Along with consumer requires the harshness of audio communication product and the develop rapidly of electronics industry, research based on 2.4G microphone array formula radio digital conference system and application are frontiers of Array Signal Processing, having important reality, economy and national defence and be worth, is dual-use technical task in the urgent need to address.The problems such as domestic digital session speech system ubiquity poor stability, poor stability, microphone pickup distance are short and not attractive in appearance.In recent years, a lot of internationally famous company and research institutions, as IBM, BELL etc. are devoted to research and the product development of microphone array.Microphone array has become current most popular high-quality speech pick tool, estimates in the near future, will replace traditional desktop or head microphone.
So-called 2.4G wireless technology, its frequency range is between 2.405GHz-2.485GHz (science, medicine, agricultural), this frequency range is international free frequency range, does not need to pay any expense to international linked groups, and this provides necessary advantage for 2.4G wireless technology developability.27MHz wireless technology before 2.4G wireless technology is different from, its working method is full-duplex mode transmission, on interference free performance, has absolute advantage than 27MHz wireless technology, maximum transmission range can reach 10 meters.In addition 2.4G wireless technology also has the message transmission rate of 2M in theory, doubles than the transmission rate of bluetooth, and manufacturing cost is lower, for application layer has improved reliable guarantee.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of clear sound, the high radio digital conference system based on 2.4G that also relatively reduces inter-signal interference of fidelity.
The technical solution adopted for the present invention to solve the technical problems is: a kind of radio digital conference system based on 2.4G, comprise at least one extension set, the main frame and the chairman's machine that use match, described extension set, main frame and chairman's machine all include AVR microprocessor and matched speech coding circuit and 2.4G transmission circuit with it, described main frame and chairman's machine have connected respectively electric power management circuit, described extension set comprises the LCD indicating circuit being connected with described AVR microprocessor, described main frame also comprises the data receiver circuit being connected with AVR microprocessor, with the corresponding audio frequency receiver module of extension set number, described audio frequency receiver module and data receiver circuit are connected with respectively 2.4G input amplifying circuit, described audio frequency receiver module is also connected with array reverberation cancellation element or/and array noise restraining device.
As the further optimization of technique scheme, described audio frequency receiver module is also connected with super long distance pick-up.
As the further optimization of technique scheme, the number a of described extension set is 0 < a < 100.Because when exceeding 100, the drop that its tonequality fidelity etc. can be corresponding.
Digital voicefrequency circuit design, microphone array, the ISM band transmission means of 2.4GHz, overall data transmission rate is 2Mbit/s, clear sound, fidelity is high;
2.4G meeting wireless radio-frequency adopts special data channel, and is equipped with frequency hopping and data encryption, effectively reduces the interference between signal;
In super long distance pickup technology running, will adopt innovatively large-scale digital microphone array and the three dimensions directional technology based on SDMA, improve the stability of system;
Than the beam-forming technology of the small array conventionally adopting, luminous energy does not reach 100 meters of overlength distance pickups, can also solve room sound field far field reverberation problem.
The beneficial effect main manifestations of a kind of radio digital conference system based on 2.4G of the present invention is: clear sound, the high inter-signal interference that also relatively reduces of fidelity.
Accompanying drawing explanation
Fig. 1 is the frame structure schematic diagram of a kind of radio digital conference system based on 2.4G of the present invention.
Embodiment
Below in conjunction with drawings and Examples, the specific embodiment of the invention is described:
As shown in Figure 1, as the preferred forms of a kind of radio digital conference system based on 2.4G of the present invention, it comprises at least one extension set, the main frame and the chairman's machine that use match, described extension set, main frame and chairman's machine all include AVR microprocessor and matched speech coding circuit and 2.4G transmission circuit with it, described main frame and chairman's machine have connected respectively electric power management circuit, described extension set comprises the LCD indicating circuit being connected with described AVR microprocessor, described main frame also comprises the data receiver circuit being connected with AVR microprocessor, with the corresponding audio frequency receiver module of extension set number, described audio frequency receiver module and data receiver circuit are connected with respectively 2.4G input amplifying circuit, described audio frequency receiver module is also connected with array reverberation cancellation element and array noise restraining device.
Described audio frequency receiver module is also connected with super long distance pick-up.
The number of described extension set is less than 100.Because when exceeding 100, the drop that its tonequality fidelity etc. can be corresponding.
Adopt beam-forming technology.The gain that digital microphone array adopts broadband signal far field beam-forming technology to improve echo signal, reaches the object that strengthens echo signal, the room reverberation of drawing up.From covariance matrix angle, explain the reason that adaptive beam forming property declines and adaptive beam distorts under reverberation environment, the correlation between signal and reverberation and between noise.Analyze adaptive beam distortion mechanism under coloured noise environment, the adaptive beam proposing under reverberation environment forms technology simultaneously.
Adopt array reverberation technology for eliminating.Digital microphone array technique utilizes multichannel microphone to gather voice signal, forms superpower space directivity by beam-forming technology.This directive property can well be avoided the omnidirectional's acoustic reverberation reflection between loud speaker and microphone, thereby suppresses most of reverberation from sound source aspect.On this basis, array reverberation technology for eliminating also adopts broadband Subband adaptive filters technology to suppress acoustic reverberation.
Adopt array noise to suppress technology.Digital microphone array technique utilizes multichannel microphone to gather voice signal, forms superpower space directivity by beam-forming technology.By signal enhancing and the inhibition to other direction noises to target language source of sound, digital microphone array can improve the output signal-to-noise ratio of signal greatly, thereby reaches good noise suppression effect.
Adopt super long distance pickup technology.In order to reach the pickup object of overlength distance, form on Research foundation at the wave beam of existing and small array, large-scale microphone array and space Speech enhancement technology thereof are applied, really realized without hand-held intelligent multi-functional conference room and software/hardware video conferencing system.
By reference to the accompanying drawings the preferred embodiment for the present invention is explained in detail above, but the invention is not restricted to above-mentioned execution mode, in the ken possessing those of ordinary skills, can also under the prerequisite that does not depart from aim of the present invention, make a variety of changes.
Do not depart from the spirit and scope of the present invention and can make many other changes and remodeling.Should be appreciated that and the invention is not restricted to specific execution mode, scope of the present invention is defined by the following claims.
Claims (3)
1. the radio digital conference system based on 2.4G, it is characterized in that, comprise at least one extension set, the main frame and the chairman's machine that use match, described extension set, main frame and chairman's machine all include AVR microprocessor and matched speech coding circuit and 2.4G transmission circuit with it, described main frame and chairman's machine have connected respectively electric power management circuit, described extension set comprises the LCD indicating circuit being connected with described AVR microprocessor, described main frame also comprises the data receiver circuit being connected with AVR microprocessor, with the corresponding audio frequency receiver module of extension set number, described audio frequency receiver module and data receiver circuit are connected with respectively 2.4G input amplifying circuit, described audio frequency receiver module is also connected with array reverberation cancellation element or/and array noise restraining device.
2. a kind of radio digital conference system based on 2.4G according to claim 1, is characterized in that, described audio frequency receiver module is also connected with super long distance pick-up.
3. a kind of radio digital conference system based on 2.4G according to claim 2, is characterized in that, the number a of described extension set is 0 < a < 100.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210479796.4A CN103841521A (en) | 2012-11-22 | 2012-11-22 | Wireless digital conference system based on 2.4G |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210479796.4A CN103841521A (en) | 2012-11-22 | 2012-11-22 | Wireless digital conference system based on 2.4G |
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| Publication Number | Publication Date |
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| CN103841521A true CN103841521A (en) | 2014-06-04 |
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| CN201210479796.4A Pending CN103841521A (en) | 2012-11-22 | 2012-11-22 | Wireless digital conference system based on 2.4G |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108520754A (en) * | 2018-04-09 | 2018-09-11 | 广东思派康电子科技有限公司 | A kind of noise reduction meeting machine |
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| CN102387266A (en) * | 2010-09-02 | 2012-03-21 | 米特尔网络公司 | Wireless extensions for a conference unit and methods thereof |
| CN202979288U (en) * | 2012-11-22 | 2013-06-05 | 苏州朗捷通智能科技有限公司 | Wireless digital conference system based on 2.4G technology |
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| KR20010000459A (en) * | 2000-09-30 | 2001-01-05 | 김종화 | Simultaneous interpretation conference system using digital wireless microphone |
| CN1902981A (en) * | 2004-01-07 | 2007-01-24 | 皇家飞利浦电子股份有限公司 | Audio system having reverberation reducing filter |
| CN1780495A (en) * | 2004-10-25 | 2006-05-31 | 宝利通公司 | Ceiling microphone assembly |
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| CN101554064A (en) * | 2006-07-21 | 2009-10-07 | Nxp股份有限公司 | Bluetooth microphone array |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108520754A (en) * | 2018-04-09 | 2018-09-11 | 广东思派康电子科技有限公司 | A kind of noise reduction meeting machine |
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