CN111970665B - Point-to-multipoint wireless audio transmission system based on Bluetooth - Google Patents
Point-to-multipoint wireless audio transmission system based on Bluetooth Download PDFInfo
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- CN111970665B CN111970665B CN202010717922.XA CN202010717922A CN111970665B CN 111970665 B CN111970665 B CN 111970665B CN 202010717922 A CN202010717922 A CN 202010717922A CN 111970665 B CN111970665 B CN 111970665B
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 49
- 238000004891 communication Methods 0.000 claims abstract description 33
- 230000007547 defect Effects 0.000 abstract description 4
- 230000005236 sound signal Effects 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 23
- 238000005070 sampling Methods 0.000 description 10
- 238000011161 development Methods 0.000 description 5
- 241000282414 Homo sapiens Species 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003221 ear drop Substances 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000004377 microelectronic Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/80—Services using short range communication, e.g. near-field communication [NFC], radio-frequency identification [RFID] or low energy communication
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
- G10L19/00—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis
- G10L19/04—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis using predictive techniques
- G10L19/16—Vocoder architecture
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/06—Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
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- Engineering & Computer Science (AREA)
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- Acoustics & Sound (AREA)
- Audiology, Speech & Language Pathology (AREA)
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- Mobile Radio Communication Systems (AREA)
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Abstract
The invention discloses a point-to-multipoint wireless audio transmission system based on Bluetooth, which comprises an audio source module, an encoder module, a Bluetooth communication module, an ear playing module and an audio output terminal module, wherein the audio source module is used for receiving audio signals; the audio source module is in communication connection with the coding module; the encoder module is connected with the Bluetooth communication module; the Bluetooth communication module comprises a sender RSL10 module and a plurality of receiver RSL10 modules; the transmitting RSL10 module wirelessly transmits and receives data of a plurality of receiving RSL10 modules through an antenna; the ear amplifier module is connected with a sender RSL10 module; and the audio output terminal module is connected with the ear amplifier module. The invention selects RSL10 as a Bluetooth chip for wireless transmission, selects WM8731 codec as a codec chip and selects TPA6138 as an earphone driver, and the three are used in cooperation, thereby technically solving the defects of short transmission distance, low audio quality and high power consumption of the traditional wireless audio transmission system.
Description
Technical Field
The invention relates to a wireless communication technology, in particular to a wireless audio transmission technology based on Bluetooth, and belongs to the technical field of wireless communication.
Background
With the rapid development of modern communication technology and microelectronic technology, more and more digital, networking and wireless applications are integrated into the lives of people. The most typical application is audio systems, which can be generally divided into wired and wireless audio systems. The traditional wired audio system adopts a wired transmission mode, is poor in mobility and cannot flexibly move due to cable connection, so that the wired transmission system can not meet daily requirements of people which are increasingly improved, and the requirements of people on the quality in the aspect of hearing are higher and higher. The development of wireless communication technology and short-distance transmission devices has promoted the birth and rapid development of wireless audio systems.
From the technical aspect, the development of wireless communication technology is closely followed by the wireless audio transmission technology, and nowadays, wireless communication is the fastest developing technology and has become a research field of great interest for researchers in the electronic field. Wireless communication refers primarily to the transmission of data without the use of cables or wires. In the aspect of wireless communication technology, infrared, Zigbee, WiFi, Bluetooth and the like are widely applied to the market at present.
The Zigbee is a duplex wireless transmission technology with the characteristics of low rate, low cost, low energy consumption, short distance, and the like, and is formulated to satisfy wireless sensor networks and internet of things of small-sized and low-cost devices, however, the low-rate characteristic of Zigbee makes Zigbee not be able to transmit high-quality audio data.
The WiFi technology has the advantages of convenient construction, wide coverage range, fast transmission speed and the like, wherein the transmission rate of the WiFi technology can reach hundreds of megabits per second, so that the WiFi technology is widely used in high-quality wireless audio transmission systems, but the power consumption of the WiFi technology is high, and the WiFi technology is not suitable for developing some portable mobile devices.
The infrared communication technology is also developed with the continuous update of the technology in application, and the technology has good public praise in many fields, has a high coefficient on the use safety, but the infrared ray can not penetrate through an opaque object, thereby improving the safety factor of the infrared communication technology, but also reducing the mobility of the infrared communication technology.
Bluetooth is the most mature technology in the field of wireless audio communication, is a communication technology for providing special connection between fixed or mobile devices on the basis of low-cost short-distance wireless communication, and has the advantages compared with Zigbee, WiFi, infrared and the like: (1) the transmission rate is fast, and the transmission rate of present bluetooth 5 can reach 24Mbps theoretically, can satisfy the requirement of CD quality audio frequency. (2) The transmission distance is large, theoretically, the effective working distance of the Bluetooth 5 can reach 300 meters, and the mobility of the equipment can be improved. (3) The low power consumption, the development of the low power consumption Bluetooth in the last two years provides guarantee for the endurance time of the Bluetooth equipment.
Therefore, it is one of the important problems to be solved at present to research a wireless audio transmission method based on bluetooth communication technology to further solve the disadvantages of short transmission distance, low audio quality and high power consumption of the conventional wireless audio transmission system.
Disclosure of Invention
The invention aims to: in order to overcome the defects of the prior art, the invention provides a point-to-multipoint wireless audio transmission system based on Bluetooth, which has long transmission distance, high fidelity and low power consumption, so as to overcome the defects of short transmission distance, low audio quality and high power consumption of the traditional wireless audio transmission system.
The technical scheme is as follows: in order to achieve the above object, an object of the present invention is to provide a bluetooth-based point-to-multipoint wireless audio transmission system, which includes an audio source module, an encoder module, a bluetooth communication module, an ear-play module, and an audio output terminal module; the audio source module is in communication connection with the coding module; the encoder module is connected with the Bluetooth communication module; the Bluetooth communication module comprises a sender RSL10 module and a plurality of receiver RSL10 modules; the transmitting RSL10 module wirelessly transmits and receives data of a plurality of receiving RSL10 modules through an antenna; the ear amplifier module is connected with a sender RSL10 module; and the audio output terminal module is connected with the ear amplifier module.
The audio source module comprises a smart phone, and the smart phone is connected with the encoder module through a 3.5mm interface.
The encoder module comprises a WM8731 encoder module, which is connected to the sender RSL10 module via a PCM interface to deliver encoded audio data.
The ear drop module comprises a TPA6138 headphone driver, and the TPA6138 headphone driver is connected with the receiver RSL10 module.
The audio output terminal module comprises an earphone, and the TPA6138 earphone driver is connected with the earphone through a 3.5mm interface.
The WM8731 encoder module PCM encodes the analog audio data.
The Bluetooth communication module realizes wireless transmission of data.
The TPA6138 headset driver amplifies the signal power received by the receiver RSL10 module.
Has the advantages that: compared with the prior art, the point-to-multipoint wireless audio transmission system based on the Bluetooth has the following advantages that:
1. a wireless audio transmission system of point-to-multipoint based on Bluetooth selects RSL10 as a Bluetooth chip of wireless transmission, selects WM8731 codec as a codec chip and selects TPA6138 as an earphone driver, and combines the three to use, thereby technically solving the defects of short transmission distance, low audio quality and high power consumption of the traditional wireless audio transmission system.
Drawings
FIG. 1 is a trend chart of MOS score values along with node spacing change in an A environment;
FIG. 2 is a trend chart of MOS score values along with node spacing changes in the B environment;
FIG. 3 is a block diagram of a Bluetooth-based point-to-multipoint wireless audio transmission system of the present invention;
FIG. 4 is a flow chart of an embodiment of the present invention;
wherein: 1. the mobile phone comprises a smart phone, a 2 audio source module, a 3 encoder module, a 4 WM8731 encoder, a 5 Bluetooth communication module, a6 sender RSL10, a 7 receiver RSL10, a 8 ear amplifier module, a 9 TPA6138 earphone 11 driver, a 10 audio output terminal module and a 11 earphone.
Detailed Description
The embodiment of the invention provides a point-to-multipoint wireless audio transmission system based on Bluetooth, which uses an RSL10 Bluetooth chip as a Bluetooth communication module 5, sets the programmable output power of the Bluetooth chip as 6dBm, and sets the Rx sensitivity of the Bluetooth chip to be-94 dBm at most, thereby being suitable for long-distance point-to-multipoint transmission; in addition, the system selects a WM8731 coder-decoder as a coding chip, and the sampling rate of the coder-decoder is set to be 44.1 KHz.
As shown in fig. 3 and 4, the bluetooth-based point-to-multipoint wireless audio transmission system includes an audio source module 2, an encoder module 3, a bluetooth communication module 5, an ear-play module 8, and an audio output terminal module 10; the audio source module 2 comprises a smart phone 1, and the smart phone 1 is connected with the encoder module 3 through a 3.5mm interface to realize the sending of analog audio data; the encoder module 3 comprises a WM8731 encoder 4 module 3, the WM8731 encoder 4 module 3 is connected with the sender RSL 106 module through a PCM interface, and encoded audio data are transmitted; the Bluetooth communication module 5 comprises a sender RSL 106 module and a plurality of receiver RSL 107 modules, wherein the sender RSL 106 module uses a custom broadcast protocol to realize wireless data sending and receiving through an antenna and the plurality of receiver RSL 107 modules; the ear playing module 8 comprises a TPA6138 earphone 11 driver 9, the TPA6138 earphone 11 driver 9 is connected with the receiver RSL 107 module, and the receiver RSL 107 sends the audio data to the TPA6138 earphone 11 driver 9; the audio output terminal module 10 includes an earphone 11 for outputting audio data to the human ear.
The WM8731 encoder 4 module 3 is connected with the sender RSL 106 module through a PCM interface to transmit encoded audio data, the audio sampling rate of the WM8731 is 8-96 kHz adjustable, and the WM8731 can sufficiently restore all recognizable signals of human beings and meet the requirement of the sampling rate of high fidelity sound quality;
the Bluetooth communication module 5 comprises a sender RSL 106 module and a plurality of receiver RSL 107 modules, and the transmission rate of the RSL10 can reach 2mbps to meet the transmission rate requirement of high-fidelity lossless transmission; the RSL10 supports programmable output power of 6dBm, and meets the requirement of farther transmission distance;
the ear placing module 8 comprises a TPA6138 earphone 11 driver 9, and the beneficial effects are that the SNR of the TPA6138 is more than 90dB, which is beneficial to improving the audio tone quality;
the programmable output power of RSL10 is set to be 6dBm, the sampling rate of WM8731 encoder 4 module 3 is 44.1KHz, the test is respectively carried out under the environment A (a research laboratory) and the environment B (a playground), the maximum transmission distance refers to the maximum line of sight (LOS) capable of maintaining a stable link in the test, and on the basis, MOS scoring is carried out on the transmitted audio tone quality at every three meters in the environment A and at every five meters in the environment B as a test point. Fig. 1 and fig. 2 show the trend of MOS scores in the two environments a and B with the change of node distance, respectively.
As can be seen from fig. 1, in the multi-obstacle environment of the research and development room, the system MOS score can be maintained at 3 points or more in the range of 22 meters, the received audio quality is good, and the noise is perceived to be more obvious in about 25 meters, and can penetrate through two walls. As can be seen from fig. 2, in the open environment such as the playground, the sound quality of the system within the range of 72 m is good, the sound quality of the system outside the range is degraded, the heard audio is intermittent, and the transmission is unstable.
Taking the transmission of mobile phone music as an example, the detailed operation steps are given by combining the system scheme provided by the invention.
and 3, connecting each module component. The smart phone 1 is connected with the WM8731 encoder 4 through a 3.5mm interface; the WM8731 encoder 4 is connected to the sender RSL 106 via a PCM interface; the receiver RSL 107 is connected with the driver 9 of the TPA6138 earphone 11 through an audio driving interface; the TPA6138 driver is connected with the earphone 11 through a 3.5mm interface;
And 4, electrifying each module, playing mobile phone music, and hearing the music played by the smart phone 1 end by wearing the earphone 11.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (5)
1. A bluetooth-based point-to-multipoint wireless audio transmission system, comprising: the system comprises an audio source module (2), an encoder module (3), a Bluetooth communication module (5), an ear playing module (8) and an audio output terminal module (10); the audio source module (2) is in communication connection with the encoder module (3); the encoder module (3) is connected with the Bluetooth communication module (5);
the encoder module (3) comprises a WM8731 encoder module (4), the WM8731 encoder module (4) is connected with a sender RSL10 module (6) through a PCM interface, and encoded audio data are transmitted
The Bluetooth communication module (5) comprises a sender RSL10 module (6) and a plurality of receiver RSL10 modules (7);
The transmitting RSL10 module (6) wirelessly transmits and receives data of a plurality of receiving RSL10 modules (7) through an antenna;
the ear playing module (8) is connected with the receiving part RSL10 module (7);
the ear playing module (8) comprises a TPA6138 earphone driver (9), and the TPA6138 earphone driver (9) is connected with the receiver RSL10 module (7)
The audio output terminal module (10) is connected with the ear amplifier module (8).
2. A bluetooth-based point-to-multipoint wireless audio transmission system according to claim 1, characterized in that: the audio source module (2) comprises a smart phone (1), and the smart phone (1) is connected with the encoder module (3) through a 3.5mm interface.
3. A bluetooth-based point-to-multipoint wireless audio transmission system according to claim 1, characterized in that: the audio output terminal module (10) comprises an earphone (11), and the TPA6138 earphone driver (9) is connected with the earphone (11) through a 3.5mm interface.
4. A bluetooth-based point-to-multipoint wireless audio transmission system according to claim 1, characterized in that: the WM8731 encoder module (4) PCM encodes analog audio data.
5. A bluetooth-based point-to-multipoint wireless audio transmission system according to claim 1, characterized in that: the TPA6138 earphone driver (9) amplifies the signal power received by the receiver RSL10 module (7).
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| CN202010717922.XA CN111970665B (en) | 2020-07-23 | 2020-07-23 | Point-to-multipoint wireless audio transmission system based on Bluetooth |
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| CN202010717922.XA CN111970665B (en) | 2020-07-23 | 2020-07-23 | Point-to-multipoint wireless audio transmission system based on Bluetooth |
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| CN111970665B true CN111970665B (en) | 2022-07-29 |
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| CN110895939A (en) * | 2019-11-19 | 2020-03-20 | 广东天波信息技术股份有限公司 | Voice interaction method, device and system |
| CN111199743A (en) * | 2020-02-28 | 2020-05-26 | Oppo广东移动通信有限公司 | Audio coding format determining method and device, storage medium and electronic equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US20200136425A1 (en) * | 2018-10-24 | 2020-04-30 | Semiconductor Components Industries, Llc | Wireless communication system and method powered by an energy harvester |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108880628A (en) * | 2018-06-22 | 2018-11-23 | 华北理工大学 | A kind of electronic communication device |
| CN110895939A (en) * | 2019-11-19 | 2020-03-20 | 广东天波信息技术股份有限公司 | Voice interaction method, device and system |
| CN111199743A (en) * | 2020-02-28 | 2020-05-26 | Oppo广东移动通信有限公司 | Audio coding format determining method and device, storage medium and electronic equipment |
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