CN110299924A - It is a kind of with the wireless microphone public address system and method for evading interference signal automatically - Google Patents
It is a kind of with the wireless microphone public address system and method for evading interference signal automatically Download PDFInfo
- Publication number
- CN110299924A CN110299924A CN201910559824.5A CN201910559824A CN110299924A CN 110299924 A CN110299924 A CN 110299924A CN 201910559824 A CN201910559824 A CN 201910559824A CN 110299924 A CN110299924 A CN 110299924A
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- module
- wireless
- interference signal
- public address
- transmitter
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/02—Transmitters
- H04B1/04—Circuits
- H04B1/0475—Circuits with means for limiting noise, interference or distortion
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R27/00—Public address systems
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- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Transmitters (AREA)
Abstract
The present invention relates to a kind of with the wireless microphone public address system for evading interference signal automatically, and the system comprises several transmitters and a receiver;The transmitter includes the first power module, voice collecting amplification module, wireless transmitter module, the first control module, the first key module, the first display module;First power module is transmitter power supply;The receiver includes second power supply module, wireless receiving module, the second control module, the second display module, the second key module, adder, power amplifier module and loudspeaker.Whether microphone of the present invention can automatically detect channel when being switched on occupied, if it find that then reselecting tranmitting frequency in the presence of interference and evading interference signal.
Description
Technical field
The present invention relates to wireless communication fields, and in particular to a kind of to amplify with the wireless microphone for evading interference signal automatically
System.
Background technique
For wireless communication system, baseband signal, which need to be loaded on high-frequency oscillation signal, to be emitted, and completes the transmission of signal.Often
A wireless transmitting device can all occupy a channel at work, in tranmitting frequency, the FM wireless microphone of early stage, and carrier frequency
Work then produces VHF wireless microphone and UHF wireless microphone in 88MHz ~ 108MHz again, but at present on the market no matter which
The wireless microphone of kind frequency range, requires first to select idle carrier frequency before use, if two transmitting equipment are in same occasion
The propagation of signal can be then hindered using identical tranmitting frequency, interference signal enters receiver by antenna, makes on receiver not
The signal of microphone can be normally received.
Summary of the invention
In view of this, the purpose of the present invention is to provide a kind of amplify with the wireless microphone for evading interference signal automatically to be
System.
To achieve the above object, the present invention adopts the following technical scheme:
It is a kind of with the wireless microphone public address system for evading interference signal automatically, the system comprises several transmitters and one
Receiver;The transmitter include the first power module, voice collecting amplification module, wireless transmitter module, the first control module,
First key module, the first display module;First power module is transmitter power supply;The voice collecting amplification module,
Wireless transmitter module, the first control module are sequentially connected;First control module is also shown with the first key module and first
Module is separately connected;The receiver includes second power supply module, wireless receiving module, the second control module, the second display mould
Block, the second key module, adder, power amplifier module and loudspeaker;The second power supply module is receiver power supply;Described
Two control modules are separately connected with key module, display module and wireless receiving module;The adder, power amplifier module and
Loudspeaker are sequentially connected;The adder is also connect with wireless receiving module.
Further, first control module and the second control module are all made of STMicw Electronics
STM32F103RCT6。
Further, first power module uses PS7516 and AMS1117-3.3;The second source mould uses
LM2596 and AMS1117-3.3.
Further, the wireless sending module and wireless receiving module are all made of RDA5820 chip.
Further, the adder is using negative voltage feedback type precision operational-amplifier OPA227.
Further, the power amplifier uses class AB power amplifier chip NS8002.
A kind of control method with the wireless microphone public address system for evading interference signal automatically, comprising the following steps:
Step S1: initialization transmitter and receiver, wireless module use the communication mode of IIC;
Step S2: it sets wireless transmitter module to obtain the signal strength of current pre- transmitting channel for reception pattern, and obtains
The weak channel of signal strength, records the frequency;
Step S3: setting emission mode for RDA5820, emits this frequency;
Step S4: the corresponding register of configuration receiver, the second display module real-time display currently receive frequency, press by second
Key module is changed frequency, the parameters such as output volume.
Compared with the prior art, the invention has the following beneficial effects:
Whether the present invention can automatically detect channel when microphone is switched on occupied, if it find that then reselecting in the presence of interference
Tranmitting frequency evades interference signal.
Detailed description of the invention
Fig. 1 is present system structural block diagram;
Fig. 2 is voice collecting amplifier module circuit diagram in one embodiment of the invention;
Fig. 3 is wireless transmitter module and wireless receiving module circuit diagram in one embodiment of the invention.
Specific embodiment
The present invention will be further described with reference to the accompanying drawings and embodiments.
Fig. 1 is please referred to, the present invention provides a kind of with the wireless microphone public address system for evading interference signal automatically, the system
System includes several transmitters and a receiver;The transmitter includes the first power module, voice collecting amplification module, nothing
Line transmitting module, the first control module, the first key module, the first display module;First power module is transmitter confession
Electricity;The voice collecting amplification module, wireless transmitter module, the first control module are sequentially connected;First control module is also
It is separately connected with the first key module and the first display module;The receiver include second power supply module, wireless receiving module,
Second control module, the second display module, the second key module, adder, power amplifier module and loudspeaker;The second source
Module is receiver power supply;Second control module is separately connected with key module, display module and wireless receiving module;Institute
Adder, power amplifier module and loudspeaker are stated to be sequentially connected;The adder is also connect with wireless receiving module.
In the present embodiment, first control module and the second control module are all made of STMicw Electronics
STM32F103RCT6。
In the present embodiment, first power module uses PS7516 and AMS1117-3.3;The second source mould is adopted
With LM2596 and AMS1117-3.3.
In the present embodiment, acquisition amplification module uses the microphone amplifier chip MAX9814 of Maxim, circuit diagram
As shown in Fig. 2, the chip amplifier section is cascaded by low-noise amplifier, voltage control Amplifier etc., it is also integrated with bias
Circuit and agc circuit.And voltage gain and AGC starting time and release time than adjustable, ensure good sound effect.
In the present embodiment, the wireless sending module and wireless receiving module are all made of RDA5820 chip.Circuit diagram is such as
Shown in Fig. 3, which there is FM to emit and receive one, supports the global FM of 65MHz ~ 115MHz to receive frequency range, supports
Stereo/monophonic switching is supported in IIC/SPI interface, digital volume and automatic AGC control, and band software mute function is supported
I2S interface (input/output), built-in LDO, high power audio output.And RSSI Channel Detection function is had, transmitting is received
Antenna can share, and when checking interference channel, avoid interfering with each other for high-frequency signal on antenna.
In the present embodiment, the adder is using negative voltage feedback type precision operational-amplifier OPA227.Have
The low noise of 3nV/ √ Hz, the offset voltage of 5 μ V, the bias current of 2.5nA and the common-mode rejection ratio of 138dB, the increasing of 8MHz
The slew rate of beneficial bandwidth product and 2.3V/ μ s.In order to avoid adder in the same direction makes to generate mutual crosstalk between input signal, mention
The stability of the system of liter, using reverse phase adder circuit, realize to signal amplify respectively or mixing sound amplifies.
In the present embodiment, the power amplifier uses class AB power amplifier chip NS8002.Drive the load of 8 Ω
Work, the chip are the audio frequency power amplifier integrated circuit of BTL working method, are to be connected by two OTL circuit bridge-types, operating voltage is
2.2V~5.5V, peak power output is up to 3.0W(total harmonic distortion THD < 10%), it is only necessary to few peripheral cell can
Work.
In the present embodiment, software section: program include following module: initialization module, IIC module, RDA5820 module,
Key module, display module, core control centre of the single-chip microcontroller as system carry out parameter modification, liquid crystal mould by key module
Block real-time display when RDA5820 is set as emission mode, carries out frequency modulation(PFM) to baseband signal, right when being set as reception pattern
FM signal is demodulated.
Program starts the initialization for first carrying out STM32F103RCT6, GPIO, OLED12864, IIC, RDA5820.
RDA5820 uses the communication mode of IIC.For microphone part, RDA5820 is first set as reception pattern and obtains current pre- transmitting frequency
The signal strength in road obtains the weak channel of signal strength by software scans, records the frequency, then set RDA5820 to
Emission mode emits this frequency, to evade interference signal.For receiver section, corresponding register, display module are configured
Real-time display currently receives frequency, and by key module to frequency, the parameters such as output volume are changed.
The booting detection channel occupancy test of table 1
Interfering frequency/MHz | Evade rear frequency/MHz | Response time |
92 | 92.2 | Less than 1S |
92.9 | 93.2 | Less than 1S |
99.6 | 99.9 | Less than 1S |
100.7 | 100.9 | Less than 1S |
101.2 | 101.5 | Less than 1S |
107 | 107.2 | Less than 1S |
The mixing sound of 2 receiver of table amplifies test
1 frequency of receiver/MHz | 2 frequencies of receiver/MHz | Mixing sound sound quality |
90.9 | 107 | Well |
91.7 | 102.1 | Well |
92 | 101.2 | Well |
92.9 | 99.6 | Well |
94 | 96.3 | Well |
The test of 3 communication distance of table
Transmitter carrier frequency/MHz | Receiver carrier frequency/MHz | Communication distance/m |
88.1 | 88.1 | 15.5 |
90.5 | 90.5 | 11 |
93.5 | 93.5 | 11.5 |
97 | 97 | 12 |
100 | 100 | 12 |
103.5 | 103.5 | 12.5 |
107.5 | 107.5 | 13 |
The foregoing is merely presently preferred embodiments of the present invention, all equivalent changes done according to scope of the present invention patent with repair
Decorations, are all covered by the present invention.
Claims (7)
1. a kind of with the wireless microphone public address system for evading interference signal automatically, it is characterised in that: the system comprises several
Platform transmitter and a receiver;The transmitter includes the first power module, voice collecting amplification module, wireless transmission mould
Block, the first control module, the first key module, the first display module;First power module is transmitter power supply;Institute's predicate
Sound acquisition amplification module, wireless transmitter module, the first control module are sequentially connected;First control module also with the first key
Module and the first display module are separately connected;The receiver includes second power supply module, wireless receiving module, the second control mould
Block, the second display module, the second key module, adder, power amplifier module and loudspeaker;The second power supply module is to receive
Machine power supply;Second control module is separately connected with key module, display module and wireless receiving module;The adder,
Power amplifier module and loudspeaker are sequentially connected;The adder is also connect with wireless receiving module.
2. according to claim 1 a kind of with the wireless microphone public address system for evading interference signal automatically, feature exists
The STM32F103RCT6 of STMicw Electronics is all made of in: first control module and the second control module.
3. according to claim 1 a kind of with the wireless microphone public address system for evading interference signal automatically, feature exists
In: first power module uses PS7516 and AMS1117-3.3;The second source mould uses LM2596 and AMS1117-
3.3。
4. according to claim 1 a kind of with the wireless microphone public address system for evading interference signal automatically, feature exists
In: the wireless sending module and wireless receiving module are all made of RDA5820 chip.
5. according to claim 1 a kind of with the wireless microphone public address system for evading interference signal automatically, feature exists
In: the adder is using negative voltage feedback type precision operational-amplifier OPA227.
6. according to claim 1 a kind of with the wireless microphone public address system for evading interference signal automatically, feature exists
In: the power amplifier uses class AB power amplifier chip NS8002.
7. a kind of controlling party with the wireless microphone public address system for evading interference signal automatically according to claim 1
Method, which comprises the following steps:
Step S1: initialization transmitter and receiver, wireless module use the communication mode of IIC;
Step S2: it sets wireless transmitter module to obtain the signal strength of current pre- transmitting channel for reception pattern, and obtains
The weak channel of signal strength, records the frequency;
Step S3: setting emission mode for RDA5820, emits this frequency;
Step S4: the corresponding register of configuration receiver, the second display module real-time display currently receive frequency, press by second
Key module is changed frequency, the parameters such as output volume.
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CN201910559824.5A CN110299924B (en) | 2019-06-26 | 2019-06-26 | Wireless microphone sound amplification system and method capable of automatically avoiding interference signals |
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CN110299924B CN110299924B (en) | 2021-07-23 |
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
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CN114339712A (en) * | 2021-12-29 | 2022-04-12 | 广州艾美网络科技有限公司 | Wireless microphone pairing method and device and wireless microphone management system |
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CN101047408A (en) * | 2006-03-31 | 2007-10-03 | 中国科学院声学研究所 | Digital radio microphone system |
CN102137315A (en) * | 2010-01-22 | 2011-07-27 | 深圳市研祥通讯终端技术有限公司 | Microphone |
CN105430541A (en) * | 2015-10-28 | 2016-03-23 | 杨子忠 | Wireless microphone automatic frequency matching method and device |
CN109511052A (en) * | 2018-11-20 | 2019-03-22 | 恩平市上格电子有限公司 | A kind of microphone system circuit |
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2019
- 2019-06-26 CN CN201910559824.5A patent/CN110299924B/en active Active
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101047408A (en) * | 2006-03-31 | 2007-10-03 | 中国科学院声学研究所 | Digital radio microphone system |
CN102137315A (en) * | 2010-01-22 | 2011-07-27 | 深圳市研祥通讯终端技术有限公司 | Microphone |
CN105430541A (en) * | 2015-10-28 | 2016-03-23 | 杨子忠 | Wireless microphone automatic frequency matching method and device |
CN109511052A (en) * | 2018-11-20 | 2019-03-22 | 恩平市上格电子有限公司 | A kind of microphone system circuit |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
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CN114339712A (en) * | 2021-12-29 | 2022-04-12 | 广州艾美网络科技有限公司 | Wireless microphone pairing method and device and wireless microphone management system |
CN114339712B (en) * | 2021-12-29 | 2024-05-07 | 广州艾美网络科技有限公司 | Pairing method and device of wireless microphone and wireless microphone management system |
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Application publication date: 20191001 Assignee: ZHANGZHOU SEETEC OPTOELECTRONICS TECHNOLOGY CO.,LTD. Assignor: XIAMEN UNIVERSITY TAN KAH KEE College Contract record no.: X2023350000253 Denomination of invention: A wireless microphone amplification system and method with automatic interference avoidance signal Granted publication date: 20210723 License type: Common License Record date: 20230519 |