CN110299924A - It is a kind of with the wireless microphone public address system and method for evading interference signal automatically - Google Patents

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

It is a kind of with the wireless microphone public address system and method for evading interference signal automatically

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.