CN101707660A - Wireless VoIP speech transmission device - Google Patents
Wireless VoIP speech transmission device Download PDFInfo
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- CN101707660A CN101707660A CN200910212616A CN200910212616A CN101707660A CN 101707660 A CN101707660 A CN 101707660A CN 200910212616 A CN200910212616 A CN 200910212616A CN 200910212616 A CN200910212616 A CN 200910212616A CN 101707660 A CN101707660 A CN 101707660A
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Abstract
The invention provides a wireless VoIP speech transmission device, which comprises a wireless transceiver, a wireless VoIP access device and a PC provided with a VoIP soft phone, wherein the wireless transceiver comprises an audio encoding and decoding module, a first chip control module and a first radio frequency module; and the wireless VoIP access device comprises a USB audio control module, a second chip control module and a second radio frequency module. In the wireless VoIP speech transmission device, the radio frequency modules select and use nRF24L01 chips of Nordic company, the hardware circuit realization is simple, a double-frequency diversity technique is used to ensure that a system has good communication quality without an external antenna, the data transmitted in the wireless transmission process is simple, and the packet loss ratio and the error rate are small; besides, a USB audio controller chip selected and used by the wireless VoIP speech transmission device is not needed to be compiled with an additional system driver to achieve the seamless butt joint with the VoIP soft phone on a windows platform, so the whole system is simple to operate.
Description
Technical field
The present invention relates to the technical field of the ip voice communications field and wireless short-range communication, the ip voice communication technology and wireless short-range communication technology are effectively combined.
Background technology
VoIP (Voice Over IP) is that the world today is with fastest developing speed, popularizes one of the fastest application technology.Voip technology is compared with traditional circuit-switched technology, is very different on the realization principle.On the exchange transmission mechanism, what VoIP adopted is packet-switch technology, and information-bearer channel is an IP network, and traditional PSTN network using circuit-switched technology, information-bearer channel connects for the fixing circuit of setting up.But lacking mobility is the deadly defect of voip technology.Along with the maturation of wireless network and perfect, how the demand that VoIP and radio communication are combined effectively just becomes more and more urgent.Voice over IP transmission (VoIP) provide the scheme of making a phone call with low cost on the net, and the wireless line of having thrown away if both combine, just can be dialed radio telephone with low cost by any wireless connections that can visit.No matter be that the extensive use of VoIP needs the support of Wireless VoIP phone in commerce or in consumer market.Relevant data shows that a large amount of uses of Wireless VoIP phone will be the main motive forces that the consumer selects VoIP.According to correlation predictive, by 2009, the U.S. used the user of Wireless VoIP phone will reach 6,600 ten thousand.In the world, consumer voip user uses the ratio of Wireless IP telephone to bring up to 70%. from present 2%
The wide range of short-distance wireless communication technology, in general sense, as long as the transceiver communication both sides are by radio wave transmissions information, and transmission range is limited in the short scope, normally in tens meters, just can be called short-distance wireless communication.Low-cost, low-power consumption and peer-to-peer communications are three key characters and the advantage of short-distance wireless communication technology.
At first, low cost is the objective requirement of short-distance wireless communication, because the volume of production and marketing of various communication terminals is all very big, provide the straight-through ability of terminal room, and not having enough low cost is to be difficult to promote.
Secondly, low-power consumption is characteristics of relative other wireless communication technology, and this communicates with, and short these the congenital characteristics of distance are closely related, because propagation distance is near, the probability that runs into barrier is also little, and transmitting power is generally all very low, usually in 1 milliwatt magnitude.
At last, peer-to-peer communications is the key character of short-distance wireless communication, is different from the wireless communication technology of infrastructure Network Based.Peer-to-peer communications between the terminal need not carry out transfer by the network equipment, so air interface designs and upper-layer protocol is all relatively simple, and the mode such as the carrier sense of competition adopted in the management of Radio Resource usually.
Main short-distance wireless communication technology is based on wireless network and the Bluetooth technology of 802.11b at present, though Wi-Fi, UWB, bluetooth all are standard agreements, but agreement complexity, development difficulty is big, the cycle is long, relative cost is big etc. all is its weakness, and the junction point of radio communication and VoIP also is far above Wi-Fi, UWB, these inlets of bluetooth.At present the short-range wireless communication protocol of standard has the agreement complexity, development difficulty is big, the cycle is long, relative cost is big etc. all is its weakness.
Summary of the invention
Goal of the invention
The objective of the invention is defective, the Wireless VoIP transmitting device of a kind of low-power consumption, low cost, easy exploiting is provided, short-distance wireless communication technology and voip technology are combined at prior art.
The present invention adopts following technical scheme for achieving the above object:
A kind of Wireless VoIP speech transmission device, the PC that comprise wireless transmitter, Wireless VoIP access device, the soft phone of VoIP is housed is formed; Wireless transmitter is connected by wireless mode with the Wireless VoIP access device, and the Wireless VoIP access device is connected with PC by the USB interface of standard, wherein:
Wireless transmitter comprises audio coding decoding module, first chip control module and first radio-frequency module; Wherein the audio coding decoding module is passed through I
2The S bus is connected with first chip control module, and first radio-frequency module is connected with first chip control module by spi bus;
The Wireless VoIP access device comprises USB audio frequency control module, second chip control module and second radio-frequency module; USB audio frequency control module is passed through I
2The C bus is connected with second chip control module, and second radio-frequency module is connected with second chip control module by spi bus.
Described first radio-frequency module of Wireless VoIP speech transmission device of the present invention and second radio-frequency module are the nRF24L01 chip of Nordic company.
The acp chip that the described USB audio frequency of Wireless VoIP speech transmission device of the present invention control module is used is the SN11220 of SONIX company.
The core devices that the described chip control module of Wireless VoIP speech transmission device of the present invention is selected for use is the Mega88 microprocessor of Atmel company.
The XE3005 chip that the described audio coding decoding module of Wireless VoIP speech transmission device of the present invention is a Semtech company.
Beneficial effect
The present invention adopts technique scheme, compared with prior art has following advantage:
1, radio-frequency module has been selected the nRF24L01 chip of Nordic company for use among the present invention, hardware circuit is realized comparatively simple, wireless communication protocol has the advantage that the construction cycle is short, cost is low according to demand custom-made by size of the present invention with respect to the wireless standard agreement.
2, the present invention has adopted comparatively advanced, a dexterous frequency hopping, can so that radio-frequency module having can with Wi-Fi, the excellent performance that Bluetooth compares favourably.In addition used the dual frequency diversity technique guarantee system need not exterior antenna and have the excellent communications quality.
Adopted PCM (pulse code modulation) voice coding modes and A-law audio compression mode among 3 the present invention, made that the data of transmitting in the wireless transmission process are comparatively simple, the packet loss and the error rate are less.
The USB Audio Controller chip that 4 the present invention select for use, need not to write extra system drive just can realize with the windows platform on the soft phone slitless connection of VoIP, whole system operates comparatively simple.
Description of drawings
Fig. 1 is a system of the present invention connection diagram.
Fig. 2 is a Wireless VoIP access device structural representation of the present invention.
Fig. 3 is a wireless transmitter structural representation of the present invention.
Fig. 4 is the circuit theory diagrams of radio-frequency module of the present invention.
Fig. 5 is the circuit theory diagrams of the USB audio frequency control module of Wireless VoIP receiving system of the present invention.
Fig. 6 is the circuit theory diagrams of chip controller module of the present invention.
Fig. 7 is the catenation principle figure of the audio coding module of wireless transmitter of the present invention.
Fig. 8 is the circuit theory diagrams of the external Mic/Phone of wireless transmitter of the present invention.
Fig. 9 is the volume control circuit schematic diagram of wireless transmitter of the present invention.
Figure 10 is the power supply circuits schematic diagram of wireless transmitter of the present invention.
Embodiment
Below in conjunction with accompanying drawing technical scheme of the present invention is described in detail, as shown in Figure 1, the application that the present invention is directed to VoIP has realized the design of VoIP connection mode, the Wireless VoIP access device is connected with PC by the USB interface of standard, because the SN11220USB audio control chip of the SONIX company that selects for use is supported the agreement of control signal transmission, need not extra drive just can realize with windows platform under the slitless connection of the soft phone of VoIP, for example: SkypeTM, wireless transmitter can carry out wireless speech transmission with the Wireless VoIP access device, real realization the slitless connection of short range wireless transmission with remote voip phone.
As shown in Figure 2, the Wireless VoIP access device comprises radio-frequency module, USB audio frequency control module, chip controller module, and USB audio frequency control module is passed through I
2C interface is connected with chip controller, and the acp chip that the audio frequency control module is used is the SN11220 of SONIX company, and USB audio frequency control module mainly acts on:
1, will carry out modulating-coding from the audio signal that USB interface is come in, the modulation system that is adopted is PCM (pulse code modulation), passes through I then
2Signal after the C bus will be encoded sends chip controller to and handles.
2, the signal that chip control module is sent is decoded, and the later voice signal of decoding is sent to PC by USB interface.
Specifically as shown in Figure 5, two pins of the RXD of the XSDO of audio control chip, XSDIN two pins and Fig. 6 chips controller, TXD link to each other, through the row transmission, the core devices that chip control module is selected for use is the Mega88 microprocessor of Atmel company to signal after the encoding and decoding by these two pairs of connecting lines.Two pins of the USBDM of Audio Controller chip, USBDP are the USB interface that connect a standard as shown in Figure 5, are used for linking to each other with PC, and the Audio Controller chip has extended out an E simultaneously
2PROM is used for writing sign of the present invention and production number.
Chip control module need be handled coming from the audio signal that the audio frequency control module sends, mainly be that it is compressed, the compress mode that adopts is the A-law compress mode, shorten the PCM signal pressure of 16bit into the 8bit audio signal, chip control module will be compressed good audio signal and send radio-frequency module to by spi bus and send then, specifically as shown in Figure 6, MOSI, the MISO two pins of radio frequency chip links to each other and is used for transmitting the good audio signal of compression among the MOSI of chip controller, MISO pin and Fig. 4.Simultaneously chip controller will be separated the PCM signal that is pressed into 16bit from the audio signal of radio-frequency module and send Audio Controller to and decode.In addition as shown in Figure 6, the crystal oscillator of the 6MHz of XTAL2, the connection of XTAL1 two pins provides clock signal for the chip controls chip.
As shown in Figure 4, the radio frequency chip that radio-frequency module is selected for use is the nRF24L011 of NORDIC company, and the ANT1 of radio frequency chip, ANT2 two pins have connected a printed board antenna, makes radio-frequency module have stable transmitting power and excellent communications quality.The crystal oscillator that while XC1, XC2 two pins have connected a 16MHz provides clock signal for it.
The hardware of the hardware circuit of wireless transmitter and Wireless VoIP access device is roughly the same, the design principle of radio-frequency module and chip control module is identical with hardware circuit, concrete circuit theory diagrams such as Fig. 4, shown in Figure 5, just to some difference of voice signal processing module, the audio coding decoding module of wireless transmitter has been selected the XE3005 of special phonetic codec chip Semtech company for use, the audio coding decoding module of wireless transmitter as shown in Figure 7, chip control module is connected with the audio coding decoding chip by spi bus and XE3005 is provided with, and passes through I
2S bus and audio coding decoding chip carry out the transmission of audio signal, the coded system that XE3005 adopts also is the PCM mode. specifically as shown in Figure 7, the SDO of XE3005, SDI two pins link to each other with RXD, the TXD two pins of chip controller, MOSI, SCK are connected with MISO, the SCK two pins of chip controller. simultaneously as shown in Figure 7, two pins of the AOUTN of audio coding decoding module chip, AOUTP have connect voice output (Phone) circuit, the AIN pin has met a phonetic entry (Mic) circuit, C
1, C
2, R
5Constituted a filter circuit.
As shown in Figure 9, button S3, S4 receive and carry out volume control on two pins of PC3, PC4 of microprocessor chip, and what S3 realized is that volume increases, and what S4 realized is that volume reduces.
As shown in figure 10, because power consumption is less, the power supply circuits of wireless transmitter are comparatively simple, adopt the button cell of a 3V to get final product.
Reasonablely be, among the present invention Wireless VoIP access device USB audio frequency control module compatibility USB HID 1.1 versions can need not extra driving just can the USB excuse by standard realize with the Windows system on the soft phone slitless connection of VoIP, support A-law and μ-law compress speech mode simultaneously.Chip controller is supported SPI, I simultaneously
2C, I
2Three kinds of mode bus of S make that the audio data transmission between the module is comparatively stable.
, this chip has used a modulation scheme preferably: based on the accurate orthogonal modulation technique of DSSS (direct spreading sequence) method, this chip is supported standard agreement and nonstandard protocol simultaneously.The chip controller peripheral circuit is simple.
Claims (5)
1. Wireless VoIP speech transmission device is characterized in that: the PC that comprise wireless transmitter, Wireless VoIP access device, the soft phone of VoIP is housed is formed; Wireless transmitter is connected by wireless mode with the Wireless VoIP access device, and the Wireless VoIP access device is connected with PC by the USB interface of standard, wherein:
Wireless transmitter comprises audio coding decoding module, first chip control module and first radio-frequency module; Wherein the audio coding decoding module is passed through I
2The S bus is connected with first chip control module, and first radio-frequency module is connected with first chip control module by spi bus;
The Wireless VoIP access device comprises USB audio frequency control module, second chip control module and second radio-frequency module; USB audio frequency control module is passed through I
2The C bus is connected with second chip control module, and second radio-frequency module is connected with second chip control module by spi bus.
2. Wireless VoIP speech transmission device according to claim 1 is characterized in that: described first radio-frequency module and second radio-frequency module are the nRF24L01 chip of Nordic company.
3. Wireless VoIP speech transmission device according to claim 1 is characterized in that: the acp chip that described USB audio frequency control module is used is the SN11220 of SONIX company.
4. Wireless VoIP speech transmission device according to claim 1 is characterized in that: the core devices that described chip control module is selected for use is the Mega88 microprocessor of Atmel company.
5. Wireless VoIP speech transmission device according to claim 1 is characterized in that: the XE3005 chip that described audio coding decoding module is a Semtech company.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910212616A CN101707660A (en) | 2009-11-13 | 2009-11-13 | Wireless VoIP speech transmission device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910212616A CN101707660A (en) | 2009-11-13 | 2009-11-13 | Wireless VoIP speech transmission device |
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| CN101707660A true CN101707660A (en) | 2010-05-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200910212616A Pending CN101707660A (en) | 2009-11-13 | 2009-11-13 | Wireless VoIP speech transmission device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103391380A (en) * | 2013-07-28 | 2013-11-13 | 杨进 | VoIP (voice over internet protocol) terminal of USB (universal serial bus) interface |
| CN105430555A (en) * | 2015-11-30 | 2016-03-23 | 曾卓 | Sound box having Wifi transmission function |
| CN110191189A (en) * | 2019-06-04 | 2019-08-30 | 深圳创维－Rgb电子有限公司 | Network medical treatment consultation method, device, computer equipment and storage medium |
-
2009
- 2009-11-13 CN CN200910212616A patent/CN101707660A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103391380A (en) * | 2013-07-28 | 2013-11-13 | 杨进 | VoIP (voice over internet protocol) terminal of USB (universal serial bus) interface |
| CN105430555A (en) * | 2015-11-30 | 2016-03-23 | 曾卓 | Sound box having Wifi transmission function |
| CN110191189A (en) * | 2019-06-04 | 2019-08-30 | 深圳创维－Rgb电子有限公司 | Network medical treatment consultation method, device, computer equipment and storage medium |
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Open date: 20100512 |