CN1194513C - High quality audio data wireless transmission module based on blue teeth technique - Google Patents
High quality audio data wireless transmission module based on blue teeth technique Download PDFInfo
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- CN1194513C CN1194513C CNB031127398A CN03112739A CN1194513C CN 1194513 C CN1194513 C CN 1194513C CN B031127398 A CNB031127398 A CN B031127398A CN 03112739 A CN03112739 A CN 03112739A CN 1194513 C CN1194513 C CN 1194513C
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Abstract
The present invention relates to a high quality audio data wireless transmission module based on the Bluetooth technique, which is method and equipment using the Bluetooth technique to carry out high quality audio transmission. The module is mainly composed a Bluetooth module, a level conversion module, a microprocessor unit a data register, a counter and an Ethernet transceiver, wherein the Bluetooth module comprises an RF front end, a frequency hopping controller, a baseband controller and a serial port; a serial port A of the microprocessor unit is connected with the serial port in the Bluetooth module; a serial port B of the microprocessor unit is connected with the level conversion module; the output end of a reset/watch dog circuit is connected with the input end of the microprocessor unit; an address line of the microprocessor unit and a chip selection line of a data line are respectively connected with the data register and a flash memory; the address line of the microprocessor unit is connected with the counter; the output end of the counter is connected with a light emitting diode. An Ethernet controller in the microprocessor unit is connected with the Ethernet transceiver which is connected with an LAN network line via an isolation transformer and an RJ45 interface.
Description
Technical field
The present invention is a kind of method and apparatus that adopts Bluetooth technology to carry out audio transmission, belongs to radio communication and household electrical appliance information-based technical field.
Background technology
Audio wireless transmission based on Bluetooth technology is used, and mainly is to use Bluetooth technology to carry the issue of audio data stream.Need to prove that the audio data stream here is different with the bluetooth speech.Bluetooth speech in general sense is meant the 64kbps narrowband voice that is carried by SCO (bluetooth baseband synchronous connection oriented link), and advanced audio applications is meant monophony or stereo audio data stream by ACL (bluetooth baseband is towards connectionless async link) carrying.Usually these audio data streams are encoded through specific coded system, and carry out suitable compression, and transmit on the ACL link adaptive back.
Present wireless transmission uses frequency modulation, amplitude modulation or infrared ray to carry out usually, and these its anti-jamming capacity of traditional signal transmission form are poor, is subjected to extraneous interference through regular meeting, thereby influences signal transfer quality.Compare with the infrared mode as bearing technology of existing employing, bluetooth approach need not be transmitted with the angle of determining in sighting distance by receiving-transmitting sides.Bluetooth approach can obtain the interference free performance more superior than infrared mode by frequency hopping mechanism simultaneously.
Summary of the invention
The objective of the invention is to make to need not cable between the various device of some indoor application occasions such as family or office and connect, only need to add Bluetooth transmission equipment and just can realize that indoor all audiogenic devices share the voice data radio transmission apparatus of exporting based on Bluetooth technology.
The present invention is a kind of voice data radio transmission apparatus based on Bluetooth technology, this equipment comprises antenna, bluetooth module, level switch module, microprocessor unit, resets/watchdog circuit, data register, flash memory, counter, light-emitting diode, ethernet transceiver, isolating transformer, RJ45 interface, and bluetooth module comprises radio-frequency front-end unit, frequency hopping control unit, baseband control unit, serial ports; Wherein the first serial of microprocessor unit and the serial ports in the bluetooth module join, the second serial and the level switch module of microprocessor unit join, this level switch module is used to be connected to audiogenic device or output equipment, reset/input of the output termination microprocessor unit of watchdog circuit, the address wire of microprocessor unit, data wire, chip select line connects data register and flash memory respectively, the address wire of microprocessor unit connects counter, the output sending and receiving optical diode of counter, ethernet controller in the microprocessor unit connects ethernet transceiver, and ethernet transceiver passes through isolating transformer, the RJ45 interface is connected to the local area network (LAN) netting twine; When having audio signal to produce from the audiogenic device end, level switch module is responsible for detecting at a high speed, the signal of serial, and by second serial it is delivered to microprocessor unit; Microprocessor unit carries out encapsulation process after receiving these high-speed serial datas, then gives the bluetooth software protocol stack, and protocol stack encapsulates the back once more and sends to bluetooth module by first serial; Otherwise, the bluetooth module of output equipment one end obtains being sent to microprocessor unit by first serial after the data, analyzes packet by the bluetooth software protocol stack of operation, after further unpacking, recover audio signal, finally consign to output equipment by second serial, level switch module.
" RESET " termination of microprocessor unit circuit resets/" RESET " end of watchdog circuit, data register comprises the first data register circuit and the second data register circuit, the data wire of microprocessor unit circuit " D0～D31 ", address wire " A1～A21 ", chip select line " CS7 " respectively with the data wire " D0～D15 " of the first data register circuit and the second data register circuit, address wire " A0～A11 ", chip select line " CS " joins, flash memory circuit comprises first flash memory circuit and second flash memory circuit, address wire of microprocessor unit circuit " A1～A11 " and data wire " D16～D31 ", the corresponding respectively address wire " A1～A19 " that connects first flash memory circuit and second flash memory circuit of chip select line " CS0; CS1 ", data wire " DQ0～DQ15 ", chip select line " CE "; Counter circuit comprises first counter circuit and second counter circuit, the input of first counter circuit " CLK " connects the address wire " A2 " of microprocessor unit circuit, and the input of second counter circuit " CLK " connects the output " Q10 " of first counter circuit; " TPOUT+, TPOUT-, TPIN+, TPIN-" end of " TPFOP, TPFON, TPFIP, TPFIN " termination isolating transformer circuit of ethernet transceiver circuit, " TX+, TX-, RX+, RX-" termination RJ45 interface of isolating transformer circuit.
When having audio signal to produce from the audiogenic device end, the level switch module of equipment is responsible for detecting at a high speed, the signal of serial, and by second serial it is delivered to microprocessor unit.Microprocessor unit receives the application software of giving operation behind these high-speed serial datas, gives us independently developed bluetooth software protocol stack after the application software encapsulation, and protocol stack encapsulates the back once more and sends to bluetooth module by first serial.Otherwise the bluetooth module of output equipment one end obtains being sent to microprocessor unit by first serial after the data, analyzes packet by the protocol stack of operation, consigns to application program.Application program recovers audio signal after further unpacking, and finally consigns to output equipment by second serial.
Above-mentioned workflow is at the good situation of channel quality.And when channel quality was abominable, the protocol stack of receiving-transmitting sides can in time be provided with the error correction parameter of bluetooth module through consultation, so that start mechanism for correcting errors, this abominable situation of conscious adaptation.When channel quality was good, receiving-transmitting sides was by resetting the normal flow that returns to no mechanism for correcting errors.
In addition, in the design of bluetooth module, for adaptive audio data stream, we have adjusted maximum retransmit time, buffer size and the buffer pool size in the bluetooth module, finally satisfy the real-time Transmission characteristic of audio data stream.
This invention has following advantage:
1, make some indoor application occasions such as family or office realize that indoor all equipment with audio signal transmission function link to each other with audio amplifier with power amplifier;
2, indoor each source of sound output equipment need not the cable connection;
3, use frequency hopping mechanism, strong interference immunity;
4, stay network interface, be convenient to control transmission with voice data by network.
5, follow according to radio channel state, whether decision adaptively adopts the method for mechanism for correcting errors;
Four, description of drawings
Fig. 1 is an application scenarios schematic diagram of the present invention.
Fig. 2 is that the circuit module of voice data radio transmission apparatus constitutes schematic diagram, comprising bluetooth module 2, level switch module 3, microprocessor unit 4, reset/watchdog circuit 5, data register 6, flash memory 7, counter 8, light-emitting diode 9, ethernet transceiver 10, isolating transformer 11, RJ45 interface 12, radio-frequency front-end unit 21, frequency hopping control unit 22, baseband control unit 23, serial ports 24.
Fig. 3 and Fig. 4 are circuit theory diagrams of the present invention, the microcontroller circuit U1 and the first data register circuit U 3, the second data register circuit U 4 are wherein arranged among Fig. 3, and crystal oscillating circuit U2 and resetting/watchdog circuit U6, the ethernet transceiver circuit U 7 and the first flash memory circuit U10, the second flash memory circuit U11 are arranged among Fig. 4, and crystal oscillating circuit U9, the first counter circuit U13, the second counter circuit U14, isolating transformer U8, serial port drive circuit U 16, bluetooth module circuit U 12; Power supply regulator block U5, U15.
Five, embodiment
The present invention is based on the voice data radio transmission apparatus of Bluetooth technology, and application scenarios as shown in Figure 1.At audiogenic device one ends such as TV, PC, CD Player, MP3 players the voice data radio transmission apparatus based on Bluetooth technology is installed; At output equipments such as power amplifier and audio amplifier one end a voice data radio transmission apparatus based on Bluetooth technology is installed also.Just can realize wireless connections between these audiogenic devices and radio transmission apparatus by Bluetooth communication protocol, for a plurality of audiogenic devices, this has also just reached the purpose of resource-sharing.Make full use of the function of the point-to-multipoint of bluetooth based on the voice data radio transmission apparatus of Bluetooth technology, can support maximum seven equipment to be connected to output equipment simultaneously.
Voice data radio transmission apparatus based on Bluetooth technology of the present invention comprises antenna 1, bluetooth module 2, level switch module 3, microprocessor unit 4, resets/watchdog circuit 5, data register 6, flash memory 7, counter 8, light-emitting diode 9, ethernet transceiver 10, isolating transformer 11, RJ45 interface 12, and bluetooth module 2 comprises radio-frequency front-end unit 21, frequency hopping control unit 22, baseband control unit 23, serial ports 24; Wherein the first serial A of microprocessor unit 4 and the serial ports 24 in the bluetooth module 2 join, the second serial B and the level switch module 3 of microprocessor unit 4 join, this level switch module 3 is used to be connected to audiogenic device or output equipment, reset/input of the output termination microprocessor unit 4 of watchdog circuit 5, the address wire of microprocessor unit 4, data wire, chip select line connects data register 6 and flash memory 7 respectively, the address wire of microprocessor unit 4 connects counter 8, the output sending and receiving optical diode 9 of counter 8, ethernet controller in the microprocessor unit 4 connects ethernet transceiver 10, and ethernet transceiver 10 is by isolating transformer 11, RJ45 interface 12 is connected to the local area network (LAN) netting twine; When having audio signal to produce from the audiogenic device end, level switch module is responsible for detecting at a high speed, the signal of serial, and by second serial it is delivered to microprocessor unit; Microprocessor unit carries out encapsulation process after receiving these high-speed serial datas, then gives the bluetooth software protocol stack, and protocol stack encapsulates the back once more and sends to bluetooth module by first serial; Otherwise, the bluetooth module of output equipment one end obtains being sent to microprocessor unit by first serial after the data, bluetooth software protocol stack by operation is analyzed packet, after further unpacking, recover audio signal, finally consign to output equipment by second serial, level switch module 3.
The microprocessor MCF5272 (U1) that microprocessor unit has adopted Motorola Inc. to produce, because it can satisfy three requirements of system:
● the serial ports baud rate reaches 921600b/s;
● as above between the dual serial mouth, carrying out data forwarding at full tilt under the baud rate situation;
● the 10/100M Ethernet interface of reservation is convenient to control transmission with voice data by network.
The peripheral circuit of microprocessor comprises data register U3, the U4 of the common 16M byte of 2 8M bytes and flash memory U10, the U11 of 2 common 4M bytes of 2M byte.Program and data when wherein data register U3, U4 are used to store operation; Flash memory U10, U11 are equivalent to the hard disk in the computer, and built-in Linux operating system and bluetooth core protocol stack (comprising logical link control and adaptation protocol, cable replacement agreement, service discovery protocol etc.) have been installed in the inside, and the serial ports Simulation drive.
Bluetooth module is realized with the BC02U12 of CSR company, because it can satisfy three requirements of system:
● provide serial ports to connect up to the 921600b/s baud rate;
● when radio frequency transmission, reach the maximum rate of bluetooth nominal;
● its base band buffering area specification and capacity can be adjusted.
Level switch module has been selected the MAX3225U16 of U.S. letter company for use, because it can provide the level conversion of the serial ports when being higher than the 921600b/s baud rate.
Ethernet transceiver U7 has adopted the LXT971 or the LXT972 of Intel Company, because they can satisfy the interface requirement of 10M and 100M Ethernet, it is mainly used in the data between transmission microprocessor U1 and the local area network (LAN).
The function of other supplementary module is as follows: 66MHz crystal oscillator U2 and 25MHz crystal oscillator U9 is respectively microprocessor U1 and ethernet transceiver U7 provides clock signal; Reset/watchdog circuit U6 can be used for resetting, and also can be used for monitor voltage, and brownout resets; Counter U13, U14 are used for frequency division, produce the control signal of run indicator; Isolating transformer U8 is used to isolate the interference of local area network (LAN).
" RESET " termination of microprocessor unit circuit U 1 resets/" RESET " end of watchdog circuit U6, the data wire of microprocessor unit circuit U 1 " D0～D31 ", address wire " A1～A21 ", chip select line " CS7 " respectively with data register circuit U 4, the data wire of U3 " D0～D15 ", address wire " A0～A11 ", chip select line " CS " joins, address wire of microprocessor unit circuit U 1 " A1～A11 " and data wire " D16～D31 " chip select line " CS0; CS1 " correspondence respectively meet flash memory circuit U10, the address wire of U11 " A1～A19 ", data wire " DQ0～DQ15 ", chip select line " CE "; The input of counter circuit U13 " CLK " connects address wire " A2 "; The input of counter circuit U14 " CLK " connects the output " Q10 " of counter circuit U13;
" TPOUT+, TPOUT-, TPIN+, TPIN-" end of " TPFOP, TPFON, TPFIP, TPFIN " termination isolating transformer circuit U 8 of ethernet transceiver circuit U 7, " TX+, TX-, RX+, RX-" termination RJ45 interface P3 of isolating transformer circuit U 8.
Just can realize the present invention according to the above.
Claims (2)
1, a kind of voice data radio transmission apparatus based on Bluetooth technology, it is characterized in that this equipment comprises antenna (1), bluetooth module (2), level switch module (3), microprocessor unit (4), reset/watchdog circuit (5), data register (6), flash memory (7), counter (8), light-emitting diode (9), ethernet transceiver (10), isolating transformer (11), RJ45 interface (12), bluetooth module (2) comprises radio-frequency front-end unit (21), frequency hopping control unit (22), baseband control unit (23), serial ports (24); Wherein the serial ports (24) in the first serial (A) of microprocessor unit (4) and the bluetooth module (2) joins, the second serial (B) of microprocessor unit (4) joins with level switch module (3), this level switch module (3) is used to be connected to audiogenic device or output equipment, the input of output termination microprocessor unit (4) of (5) resets/watchdog circuit, the address wire of microprocessor unit (4), data wire, chip select line connects data register (6) and flash memory (7) respectively, the address wire of microprocessor unit (4) connects counter (8), the output sending and receiving optical diode (9) of counter (8), ethernet controller in the microprocessor unit (4) connects ethernet transceiver (10), and ethernet transceiver (10) is by isolating transformer (11), RJ45 interface (12) is connected to the local area network (LAN) netting twine; When having audio signal to produce from the audiogenic device end, level switch module is responsible for detecting at a high speed, the signal of serial, and by second serial it is delivered to microprocessor unit; Microprocessor unit carries out encapsulation process after receiving these high-speed serial datas, then gives the bluetooth software protocol stack, and protocol stack encapsulates the back once more and sends to bluetooth module by first serial; Otherwise, the bluetooth module of output equipment one end obtains being sent to microprocessor unit by first serial after the data, bluetooth software protocol stack by operation is analyzed packet, after further unpacking, recover audio signal, finally consign to output equipment by second serial, level switch module (3).
2, voice data radio transmission apparatus based on Bluetooth technology according to claim 1, " RESET " termination that it is characterized in that microprocessor unit circuit (U1) resets/" RESET " end of watchdog circuit (U6), data register comprises the first data register circuit (U3) and the second data register circuit (U4), the data wire " D0～D31 " of microprocessor unit circuit (U1), address wire " A1～A21 ", chip select line " CS7 " respectively with the data wire " D0～D15 " of the first data register circuit (U3) and the second data register circuit (U4), address wire " A0～A11 ", chip select line " CS " joins, flash memory circuit comprises first flash memory circuit (U10) and second flash memory circuit (U11), the address wire " A1～A11 " of microprocessor unit circuit (U1) and data wire " D16～D31 ", chip select line " CS0; CS1 " correspondence respectively connects the address wire " A1～A19 " of first flash memory circuit (1U10) and second flash memory circuit (U11), data wire " DQ0～DQ15 ", chip select line " CE "; Counter circuit comprises first counter circuit (U13) and second counter circuit (U14), the input " CLK " of first counter circuit (U13) connects the address wire " A2 " of microprocessor unit circuit (U1), and the input " CLK " of second counter circuit (U14) connects the output " Q10 " of first counter circuit (U13); " TPOUT+, TPOUT-, TPIN+, TPIN-" end of " TPFOP, TPFON, TPFIP, TPFIN " the termination isolating transformer circuit (U8) of ethernet transceiver circuit (U7), " TX+, TX-, RX+, RX-" the termination RJ45 interface (P3) of isolating transformer circuit (U8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031127398A CN1194513C (en) | 2003-01-24 | 2003-01-24 | High quality audio data wireless transmission module based on blue teeth technique |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031127398A CN1194513C (en) | 2003-01-24 | 2003-01-24 | High quality audio data wireless transmission module based on blue teeth technique |
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| CN1431809A CN1431809A (en) | 2003-07-23 |
| CN1194513C true CN1194513C (en) | 2005-03-23 |
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| CNB031127398A Expired - Fee Related CN1194513C (en) | 2003-01-24 | 2003-01-24 | High quality audio data wireless transmission module based on blue teeth technique |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100372248C (en) * | 2003-11-14 | 2008-02-27 | 华为技术有限公司 | Frequency hopping sequence generating method for realizing blue tooth cellural organized net |
| CN100367187C (en) * | 2005-04-30 | 2008-02-06 | 艾威梯软件技术(北京)有限公司 | Method for simultanuously supporting multiple path blue-tooth audio application |
| CN101252553B (en) * | 2008-04-11 | 2011-04-20 | 东南大学 | Wireless sensor network multi-interface gateway equipment with terminal function and uses thereof |
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