CN202979288U - Wireless digital conference system based on 2.4G technology - Google Patents
Wireless digital conference system based on 2.4G technology Download PDFInfo
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- CN202979288U CN202979288U CN 201220624150 CN201220624150U CN202979288U CN 202979288 U CN202979288 U CN 202979288U CN 201220624150 CN201220624150 CN 201220624150 CN 201220624150 U CN201220624150 U CN 201220624150U CN 202979288 U CN202979288 U CN 202979288U
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Abstract
The utility model belongs to the wireless technical field, especially relates to a wireless digital conference system based on 2.4G technology. The wireless digital conference system includes at least one extension set as well as a host set and a chairman set which are used in a matched manner, each extension set, the host set and the chairman set respectively comprise an AVR microprocessor as well as a speech coding circuit and a 2.4G transmitting/receiving circuit which are connected with the AVR microprocessor in a matched manner; the host set and the chairman set are respectively connected with a power source management circuit in a matched manner; each extension set comprises an LCD indicating circuit which is connected with the AVR microprocessor; the host set further comprises a data receiving circuit which is connected with the AVR microprocessor and audio receiving modules corresponding to the number of the extension sets; the audio receiving modules and the data receiving circuit are respectively connected with a 2.4G input amplifying circuit; and the audio receiving modules are further connected with an array reverberation elimination device or/and array noise suppression device. The wireless digital conference system is advantageous in clear sound, high fidelity and relatively reduced interference between signals.
Description
Technical field
The utility model belongs to wireless technical field, relates in particular to a kind of radio digital conference system based on 2.4G.
Background technology
Along with the consumer, the harshness of audio communication product is required and the develop rapidly of electronics industry, a frontier that is Array Signal Processing based on research and the application of 2.4G microphone array formula radio digital conference system, 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 all are devoted to research and the product development of microphone array as IBM, BELL etc.Oneself becomes current most popular high-quality speech pick tool microphone array, 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.2.4G the 27MHz wireless technology before wireless technology is different from, its working method are the full-duplex mode transmission, than 27MHz wireless technology, absolute advantage are arranged on interference free performance, maximum transmission range can reach 10 meters.The 2.4G wireless technology also has the message transmission rate of 2M in theory in addition, 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 in the utility model 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 scheme that its technical problem that solves the utility model adopts 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 match and use, 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 that is connected with described AVR microprocessor, described main frame also comprises the data receiver circuit that is connected with the 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 the 2.4G input amplifying circuit, described audio frequency receiver module also is connected with array reverberation cancellation element or/and the array noise restraining device.
As the further optimization of technique scheme, described audio frequency receiver module also is 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 surpassing 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 are 2Mbit/s, clear sound, fidelity is high;
2.4G the meeting wireless radio-frequency adopts special-purpose data channel, and is equipped with frequency hopping and data encryption, effectively reduces the interference between signal;
In the running of super long distance pickup technology, will adopt innovatively large-scale digital microphone array and based on the three dimensions directional technology of SDMA, improve Systems balanth;
Than the beam-forming technology of the small array that usually adopts, luminous energy does not reach 100 meters 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 utility model is: clear sound, fidelity is high and relatively reduce inter-signal interference.
Description of drawings
Fig. 1 is the frame structure schematic diagram of a kind of radio digital conference system based on 2.4G of the utility model.
Embodiment
Below in conjunction with drawings and Examples, the utility model embodiment is described:
as shown in Figure 1, preferred forms as a kind of radio digital conference system based on 2.4G of the utility model, it comprises at least one extension set, the main frame and the chairman's machine that match and use, 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 that is connected with described AVR microprocessor, described main frame also comprises the data receiver circuit that is connected with the 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 the 2.4G input amplifying circuit, described audio frequency receiver module also is connected with array reverberation cancellation element and array noise restraining device.
Described audio frequency receiver module also is connected with super long distance pick-up.
The number of described extension set is less than 100.Because when surpassing 100, the drop that its tonequality fidelity etc. can be corresponding.
Adopt beam-forming technology.The gain that digital microphone array employing broadband signal far field beam-forming technology improves echo signal reaches the purpose that strengthens echo signal, the room reverberation of drawing up.From the covariance matrix angle, explained that under reverberation environment adaptive beam forms the reason of hydraulic performance decline and adaptive beam distortion, between signal and reverberation and the correlation between noise.Analyze simultaneously adaptive beam distortion mechanism under the coloured noise environment, the adaptive beam that proposes under the reverberation environment forms technology.
Adopt array reverberation technology for eliminating.The digital microphone array technique utilizes the 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 the 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.The digital microphone array technique utilizes the multichannel microphone to gather voice signal, forms superpower space directivity by beam-forming technology.By the signal of target language source of sound being strengthened and to the inhibition of other direction noises, the 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 purpose of overlength distance, wave beam at existing and small array forms on Research foundation, large-scale microphone array and space Speech enhancement technology thereof are used, really realized without hand-held intelligent multi-functional conference room and software/hardware video conferencing system.
The above has done detailed description to the utility model preferred implementation by reference to the accompanying drawings, but the utility model is not limited to above-mentioned execution mode, in the ken that those of ordinary skills possess, can also make a variety of changes under the prerequisite that does not break away from the utility model aim.
Do not break away from design of the present utility model and scope and can make many other changes and remodeling.Should be appreciated that the practical specific execution mode that is not limited to, scope of the present utility model is defined by the following claims.
Claims (3)
1. 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 match and use, 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 that is connected with described AVR microprocessor, described main frame also comprises the data receiver circuit that is connected with the 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 the 2.4G input amplifying circuit, described audio frequency receiver module also is connected with array reverberation cancellation element or/and the 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 also is 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 |
|---|---|---|---|
| CN 201220624150 CN202979288U (en) | 2012-11-22 | 2012-11-22 | Wireless digital conference system based on 2.4G technology |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220624150 CN202979288U (en) | 2012-11-22 | 2012-11-22 | Wireless digital conference system based on 2.4G technology |
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| CN202979288U true CN202979288U (en) | 2013-06-05 |
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| CN 201220624150 Expired - Lifetime CN202979288U (en) | 2012-11-22 | 2012-11-22 | Wireless digital conference system based on 2.4G technology |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103841521A (en) * | 2012-11-22 | 2014-06-04 | 苏州朗捷通智能科技有限公司 | Wireless digital conference system based on 2.4G |
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2012
- 2012-11-22 CN CN 201220624150 patent/CN202979288U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103841521A (en) * | 2012-11-22 | 2014-06-04 | 苏州朗捷通智能科技有限公司 | Wireless digital conference system based on 2.4G |
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Granted publication date: 20130605 |