CN209787155U - Wireless microphone system and wireless transmitting device - Google Patents
Wireless microphone system and wireless transmitting device Download PDFInfo
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- CN209787155U CN209787155U CN201920639908.5U CN201920639908U CN209787155U CN 209787155 U CN209787155 U CN 209787155U CN 201920639908 U CN201920639908 U CN 201920639908U CN 209787155 U CN209787155 U CN 209787155U
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Abstract
The utility model discloses a wireless microphone system and wireless transmitting device through establishing two audio transmission passageways between wireless transmitting device and wireless receiving device, transmits the audio carrier signal of different frequencies respectively to utilize the audio carrier signal of same wireless transmitting device transmission different frequencies, can select wherein the better passageway of the same kind of signal to communicate. When the situation that one path of the audio signals is continuously interfered is detected, the other path of the audio signals can be automatically switched to transmit the audio carrier signals, and the frequency of a channel with continuous interference is changed, so that the two paths of the audio carrier signals are ensured to be in a communicable state, a backup function is realized, the communication between a wireless transmitting device and a wireless receiving device is not interrupted when the interference occurs, and the user experience and the use reliability are effectively improved.
Description
Technical Field
The utility model relates to a wireless communication field, especially a wireless microphone system and wireless transmitting device.
Background
With the increasing living standard of people, the application of wireless transmitting devices (such as wireless microphones) is becoming more and more. The rapid development of electronic science and technology has made the operation of wireless transmission devices more and more reliable. The wireless signal is reflected by an object in the transmission process, so that indexes such as the propagation direction, the amplitude, the phase and the like of the wireless signal are changed, and finally the wireless signal is superposed with a signal which is linearly propagated to generate multipath interference, wherein the multipath interference is instantaneous interference. In addition to multipath interference, there are often other external interferences. For example, as frequency resources are increasingly tensed and the number of wireless transmitting devices and receiving devices in a use range is increased due to higher and higher use requirements, mutual interference is easily generated between a plurality of wireless transmitting devices and receiving devices; still other electromagnetic devices can produce varying degrees of interference. Such external disturbances are often present for a long time. At present, most wireless transmitting devices can only manually change the receiving frequency of receiving devices when interference occurs, communication interruption is inevitable, and the use experience and perception of users are reduced. When used in important places, the reliability of use cannot be guaranteed.
SUMMERY OF THE UTILITY MODEL
In order to solve the above problems, an object of the present invention is to provide a wireless microphone system and a wireless transmitter, which can transmit audio carrier signals of different frequencies simultaneously through two channels, and can perform fast switching of transmission channels when interference occurs, and ensure uninterrupted communication.
The utility model provides a technical scheme that its problem adopted is:
In a first aspect, an embodiment of the present invention provides a wireless microphone system, including:
The wireless transmitting device outputs two paths of audio carrier signals with different frequencies;
The wireless receiving device and the wireless transmitting device are provided with a first audio transmission channel and a second audio transmission channel which have different carrier frequencies;
The wireless transmitting device outputs two paths of audio carrier signals with different frequencies to the wireless receiving device through the first audio transmission channel and the second audio transmission channel respectively.
Further, the wireless transmitting device generates two carrier frequencies through two paths of completely independent frequency synthesis circuits, respectively modulates the two paths of frequency synthesis circuits to generate two frequency modulation frequencies through the same path of microphone signal amplification processing, outputs the two paths of audio carrier signals with different frequencies after power amplification, and the modulation signal sources and the modulation parameters of the two paths of audio carrier signals with different frequencies are consistent; the two paths of audio carrier signals with different frequencies are respectively transmitted to the wireless receiving device through the first audio transmission channel and the second audio transmission channel, and the wireless receiving device demodulates and restores the two paths of audio signals by using the frequencies corresponding to the first audio transmission channel and the second audio transmission channel.
Further, wireless transmitting device includes adapter, pickup amplifier, first frequency synthesis circuit, second frequency synthesis circuit, amplifier, first audio frequency modulator, second audio frequency modulator, first MCU and power amplifier, the adapter is connected with pickup amplifier, pickup amplifier passes through respectively first frequency synthesis circuit and second frequency synthesis circuit connect the amplifier, the amplifier is connected respectively first audio frequency modulator and second audio frequency modulator, first audio frequency modulator and second audio frequency modulator respectively with first MCU connects, first audio frequency modulator and second audio frequency modulator produce respectively two different audio frequency carrier signal send to power amplifier enlargies the back output.
Further, the first audio modulator or the second audio modulator comprises a first PLL and a first VCO, the first PLL is connected with the first VCO, the first VCO is connected with the amplifier, and the first PLL and the first VCO are respectively connected with the first MCU.
Further, the first frequency synthesis circuit or the second frequency synthesis circuit comprises a pre-emphasis circuit and a dynamic compander, and the pickup amplifier, the pre-emphasis circuit, the dynamic compander and the amplifier are connected in sequence.
Further, the two audio carrier signals generated by the first audio modulator and the second audio modulator are alternately input into the power amplifier.
Further, the wireless receiving device comprises two paths of demodulation circuits, each demodulation circuit comprises an LNA (low-noise amplifier), a first mixer, a third frequency synthesis circuit, a second mixer, an IF (intermediate frequency) amplifier and an FM (frequency modulation) demodulator, the LNA amplifier, the first mixer, the second amplifier and the FM demodulator are sequentially connected, and the third frequency synthesis circuit is connected between the first mixer and the second mixer; the third frequency synthesis circuit, the FM demodulator and the selection switch are respectively connected with the second MCU.
Further, the third frequency synthesis circuit comprises a first VCO in the A path, a PLL in the A path and a second VCO in the A path, the first VCO in the A path, the PLL in the A path and the second VCO in the A path are sequentially connected, the first VCO in the A path is connected with the first mixer, the second VCO in the A path is connected with the second mixer, and the PLL in the A path is connected with the second MCU.
Further, a data channel for transmitting control signals is established between the wireless transmitting device and the wireless receiving device.
In a second aspect, the embodiment of the present invention further provides a wireless transmitting apparatus, including first MCU, pickup, power amplifier, first audio modulator and second audio modulator for outputting two paths of audio carrier signals with different frequencies respectively, the input of first audio modulator and second audio modulator is from the same audio signal of pickup, power amplifier respectively with the output of first audio modulator and second audio modulator is connected, first audio modulator and second audio modulator are connected with first MCU respectively.
The embodiment of the utility model provides an in one or more technical scheme, following beneficial effect has at least: the utility model provides a pair of wireless microphone system and wireless transmitting device, through establishing two audio transmission passageways between wireless transmitting device and wireless receiving device, transmit the audio carrier signal of different frequencies respectively, and utilize the audio carrier signal of same wireless transmitting device transmission different frequencies, when one of them audio transmission passageway exists the interference, can switch to another information transmission passageway and carry out signal transmission, thereby communication does not break off when guaranteeing to appear interfering, effectively improve user's experience and the reliability of use.
Drawings
The invention is further described with reference to the following figures and examples.
Fig. 1 is a schematic block diagram of a first embodiment of a wireless microphone system according to the present invention;
fig. 2 is a schematic block diagram of a second embodiment of a wireless microphone system of the present invention;
Fig. 3 is a schematic block diagram of a wireless transmitter in an embodiment of a wireless microphone system of the present invention;
Fig. 4 is a schematic block diagram of a wireless receiving device in an embodiment of a wireless microphone system of the present invention;
Fig. 5 is a schematic diagram of an embodiment of a wireless microphone system according to the present invention in which two audio carrier signals are alternately input to a power amplifier;
Fig. 6 is a schematic diagram of a pre-emphasis circuit in an embodiment of a wireless microphone system of the present invention;
Fig. 7 is a schematic diagram of a de-emphasis circuit in an embodiment of a wireless microphone system of the invention.
Detailed Description
referring to fig. 1, the first embodiment of a wireless microphone system of the present invention includes a wireless transmitter 100 and a wireless receiver 200, wherein the wireless transmitter 100 is configured to output two paths of audio carrier signals with different frequencies; the wireless receiving device 200 is used for establishing a first audio transmission channel and a second audio transmission channel with different carrier frequencies with the wireless transmitting device 100; the wireless transmitting device 100 outputs two paths of audio carrier signals with different frequencies to the wireless receiving device 200 through the first audio transmission channel and the second audio transmission channel, respectively.
Further, the wireless transmitting device 100 generates two carrier frequencies through two completely independent frequency synthesis circuits, respectively modulates the two frequency synthesis circuits to generate two frequency modulation frequencies through the same microphone signal amplification process, and outputs two audio carrier signals with different frequencies after power amplification, wherein the modulation signal sources and the modulation parameters of the two audio carrier signals with different frequencies are consistent; the two paths of audio carrier signals with different frequencies are transmitted to the wireless receiving device 200 through the first audio transmission channel and the second audio transmission channel, respectively, and the wireless receiving device 200 demodulates and restores the two paths of audio signals by using the frequencies corresponding to the first audio transmission channel and the second audio transmission channel.
Referring to fig. 3, the wireless transmitting apparatus 100 includes a sound collector 110, a sound collecting amplifier 120, a first frequency synthesizing circuit 130, a second frequency synthesizing circuit 140, an amplifier 150, a first audio modulator 160, a second audio modulator 170, a first MCU180, and a power amplifier 190, the sound collector 110 is connected to the sound collecting amplifier 120, the sound collecting amplifier 120 is connected to the amplifier 150 through the first frequency synthesizing circuit 130 and the second frequency synthesizing circuit 140, respectively, the amplifier 150 is connected to the power amplifier 190 through the first audio modulator 160 and the second audio modulator 170, respectively, and the first audio modulator 160 and the second audio modulator 170 are connected to the first MCU180, respectively. The first MCU180 may adopt a single chip microcomputer whose model is STM8S105, and since the pin connection scheme and the corresponding functions of the single chip microcomputer are the prior art, they are not described herein again. In other embodiments, other types of single-chip microcomputers may also be used, which is not limited herein.
Specifically, the first audio modulator 160 includes a first PLL161 and a first VCO162, the first PLL161 is connected to the first VCO162, the first VCO162 is connected to the amplifier 150, and the first PLL161 and the first VCO162 are respectively connected to the first MCU 180; the second audio modulator 170 has the same structure as the first audio modulator 160, the second audio modulator 170 includes a second PLL171 and a second VCO172, the second PLL171 is connected to the second VCO172, the second VCO172 is connected to the amplifier 150, and the second PLL171 and the second VCO172 are respectively connected to the first MCU 180. The specific structure of the PLL, i.e., the phase locked loop, and the VCO, i.e., the voltage controlled oscillator, is the prior art and will not be described herein.
Specifically, the first frequency synthesizing circuit 130 and the second frequency synthesizing circuit 140 each include a pre-emphasis circuit and a dynamic compander, and the sound pickup amplifier 120, the pre-emphasis circuit, the dynamic compander and the amplifier 150 are connected in sequence. Referring to fig. 6, the specific structure of the pre-emphasis circuit is conventional in the art and will not be described herein. The dynamic compander can adopt the SA572 in the prior art, and is not explained here.
The first frequency synthesizer circuit 130 and the second frequency synthesizer circuit 140 generate two carrier frequencies, respectively, and after the two carrier frequencies are amplified by the amplifier 150, the first audio modulator 160 and the second audio modulator 170 modulate the two carrier frequencies, respectively, to generate two different audio carrier signals. The first MCU180 transmits corresponding control signals to the first PLL161 and the first VCO162, and the second PLL171 and the second VCO172 to control modulation parameters thereof.
Further, the two audio carrier signals generated by the first audio modulator 160 and the second audio modulator 170 are alternately input to the power amplifier 190. The two audio carrier signals generated by the first audio modulator 160 and the second audio modulator 170 may be simultaneously input to the power amplifier 190 or amplified and output by the two power amplifiers 190, but in this way, mutual interference may occur between the two audio carrier signals, which affects the signal quality thereof. Therefore, an alternate input mode is adopted, specifically, one of the audio carrier signals is input in a delayed manner, for example, referring to fig. 5, the duration of the first audio carrier signal is 8ms, and the second audio carrier signal is input from the 6 th ms after the first audio carrier signal is input, so that the duration of the simultaneous input of the two audio carrier signals is 2ms, which cannot be distinguished by human ears, and thus, the mutual interference generated when the two audio carrier signals are input is effectively reduced. Of course, the second audio carrier signal may also be input from the 7 th ms after the first audio carrier signal is input, as long as the overlapping duration of the two audio signals is ensured to be 1ms-2ms, which is not limited herein.
referring to fig. 4, the wireless receiving apparatus 200 includes A, B two-way demodulation circuits, where the a-way demodulation circuit includes an a-way LNA amplifier 211, an a-way first mixer 212, a third frequency synthesizer circuit 213, an a-way second mixer 214, an a-way IF amplifier 215, and an a-way FM demodulator 216, the a-way LNA amplifier 211, the a-way first mixer 212, the a-way second mixer 214, the a-way IF amplifier 215, and the a-way FM demodulator 216 are connected in sequence, and the third frequency synthesizer circuit 213 is connected between the a-way first mixer 212 and the a-way second mixer 214; the B-path demodulation circuit comprises a B-path LNA amplifier 221, a B-path first mixer 222, a fourth frequency synthesis circuit 223, a B-path second mixer 224, a B-path IF amplifier 225 and a B-path FM demodulator 226, the B-path LNA amplifier 221, the B-path first mixer 222, the B-path second mixer 224, the B-path IF amplifier 225 and the B-path FM demodulator 226 are sequentially connected, and the third frequency synthesis circuit 213 is connected between the B-path first mixer 222 and the B-path second mixer 224; the digital signal processing circuit further comprises a second MCU230 and a selection switch 240 for selecting the signal output of one of the demodulation circuits, wherein the third frequency synthesis circuit 213, the fourth frequency synthesis circuit 223, the A-path FM demodulator 216, the B-path FM demodulator 226 and the selection switch 240 are respectively connected with the second MCU 230. The a FM demodulator 216 and the B FM demodulator 226 may adopt KT0613 chips in the prior art, and are not described herein again.
Specifically, the third frequency synthesis circuit 213 includes a first a-channel VCO2131, a PLL2132, and a second a-channel VCO2133, where the first a-channel VCO2131, the PLL2132, and the second a-channel VCO2133 are sequentially connected, the first a-channel VCO2131 is connected to the first mixer, the second a-channel VCO2133 is connected to the second mixer, and the PLL2132 is connected to the second MCU 230; the fourth frequency synthesizing circuit 223 includes a B-channel first VCO2231, a B-channel PLL2232, and a B-channel second VCO2233, the B-channel first VCO2231, the B-channel PLL2232, and the B-channel second VCO2233 are sequentially connected, the B-channel first VCO2231 is connected to the first mixer, the B-channel second VCO2233 is connected to the second mixer, and the B-channel PLL2232 is connected to the second MCU 230.
A. The two paths of demodulation circuits B receive the two audio carrier signals from the wireless transmitting device 100, the two paths of demodulation circuits and the two audio carrier signals have no rigid corresponding relationship, and each path of demodulation circuit is responsible for receiving one audio carrier signal. The operation principle of the a-channel demodulation circuit is described below by way of example. The audio carrier signal from the wireless transmitter 100 is amplified by the a-way LNA amplifier 211, and is first mixed with the oscillation frequency generated by the a-way first VCO2131 to obtain a first IF signal, and the first IF signal is then second mixed with the oscillation frequency generated by the a-way second VCO2133 to obtain a second IF signal, and the second IF signal is input to the a-way FM demodulator 216 to be demodulated to restore the audio signal. The working principle of the B-path demodulation circuit is the same as that of the a-path demodulation circuit, and is not described herein again.
The wireless receiving device 200 determines the quality of the audio carrier signals of the first audio transmission channel and the second audio transmission channel, and selects a channel of audio carrier signal with better audio carrier signal quality to output. When the wireless receiving device 200 detects that the audio carrier signal of the first audio transmission channel or the second audio transmission channel is not continuously lower than the set standard, the quality of the audio carrier signal of the first audio transmission channel and the quality of the audio carrier signal of the second audio transmission channel are continuously compared, and one audio carrier signal with better audio carrier signal quality is selected for demodulation and output. Referring to fig. 5, the output audio signal may be selected by a selection switch 240 in the prior art, for example, a switch terminal 241 of the selection switch 240 is respectively connected to the output terminals of the a-channel FM demodulator 216 and the B-channel FM demodulator 226, and the second MCU230 controls the selection switch 240 to turn on the FM demodulation module corresponding to the audio transmission channel for output through the continuously compared audio carrier signal quality. The selection switch 240 may adopt CD4053, and the second MCU230 may adopt a triode for controlling the selection switch 240 to amplify the control signal, for example: the base of the NPN triode is connected to the control signal transmitting pin of the second MCU230, the emitter is grounded, the collector is connected to the control terminal 242 of the selection switch 240, the switch terminal 241 of the selection switch 240 is connected to the output terminals of the a-channel FM demodulator 216 and the B-channel FM demodulator 226, respectively, and if the switch terminal 241 of the selection switch 240 receives the control signal of the second MCU230, the corresponding FM demodulator can be turned on to perform the output of the audio signal according to the control signal of the second MCU 230.
specifically, the wireless receiving device 200 determines the quality of the audio carrier signal by detecting the signal-to-noise ratio and/or the field strength of the audio carrier signals of the first audio transmission channel and the second audio transmission channel, and specifically, the demodulated audio carrier signal may be subjected to AD conversion, voltage comparison may be performed through a chip or a gate circuit, and meanwhile, a quality standard value of the audio carrier signal may be set through the second MCU 230. In order to further improve the detection accuracy, the audio carrier signal can be subjected to spectrum analysis simultaneously, and the quality of the audio carrier signal can be further determined by combining the signal-to-noise ratio and/or the field intensity. If the audio carrier signal needs to be subjected to spectrum analysis, the audio carrier signal subjected to AD conversion can be received by using an FPGA device in the prior art for analysis, and the FPGA device is connected to the second MCU 230.
The wireless transmitting device 100 and the wireless receiving device 200 are respectively provided with a communication module for performing remote communication with each other, and establish a data channel so that the wireless receiving device 200 can transmit a control signal to the wireless transmitting device 100. The communication module may adopt a 2.4g module in the prior art, a control signal channel is established between the wireless receiving device 200 and the wireless transmitting device 100, when the wireless receiving device 200 detects that the quality of the audio carrier signal of the first audio transmission channel or the second audio transmission channel is continuously lower than a set standard, it is determined that the audio transmission channel is subjected to environmental interference, at this time, the audio transmission channel is shielded, and the audio carrier signal of the other audio transmission channel is kept output, the wireless receiving device 200 performs frequency hopping on the audio transmission channel with the quality lower than the set standard, and sends a frequency hopping instruction to the wireless transmitting device 100 through the control signal channel, and the wireless transmitting device 100 adjusts the frequency of the audio carrier signal output to the audio transmission channel lower than the set standard in response to the frequency hopping instruction.
specifically, taking the a-channel demodulation circuit as an example, when frequency hopping is needed, the second MCU230 sends a control signal to the a-channel PLL2132, the a-channel PLL2132 further controls the a-channel VCO to change its oscillation frequency, the wireless receiving device 200 sends a frequency hopping instruction to the wireless transmitting device 100 through the data channel, after receiving the frequency hopping instruction, the first MCU180 sends a frequency hopping instruction to the first audio modulator 160 corresponding to the a-channel demodulation circuit, the first PLL161 further controls the first VCO162 to change its oscillation frequency, so that the operating frequencies of the a-channel demodulation circuit and the first audio modulator 160 are the same, and both sides re-handshake to establish communication.
Further, the audio signal output by the a-path FM demodulator 216 or the B-path FM demodulator 226 is further processed by the de-emphasis circuit, the dynamic compander, and the output amplifier, and then output. Referring to fig. 7, the detailed structure of the de-emphasis circuit is conventional in the art and will not be described herein.
Referring to fig. 2, a second embodiment of the present invention includes a wireless transmitter 100, a wireless receiver 200 and a control host, and similarly, the wireless transmitter 100 is configured to output two paths of audio carrier signals with different frequencies; the wireless receiving device 200 is used for establishing a first audio transmission channel and a second audio transmission channel with different carrier frequencies with the wireless transmitting device 100; the wireless transmitting device 100 outputs two paths of audio carrier signals with different frequencies to the wireless receiving device 200 through the first audio transmission channel and the second audio transmission channel, respectively.
The wireless receiving device 200 determines the quality of the audio carrier signals of the first audio transmission channel and the second audio transmission channel, and selects a channel of audio carrier signal with better audio carrier signal quality to output. When the wireless receiving device 200 detects that the audio carrier signal of the first audio transmission channel or the second audio transmission channel is not continuously lower than the set standard, the quality of the audio carrier signal of the first audio transmission channel and the quality of the audio carrier signal of the second audio transmission channel are continuously compared, and one audio carrier signal with better audio carrier signal quality is selected for output.
The control host is used for sending a control instruction to the wireless transmitting device 100 and the wireless receiving device 200, the wireless receiving device 200 detects that the quality of the audio carrier signal of the first audio transmission channel or the second audio transmission channel is continuously lower than a set standard, determines that the audio transmission channel is subjected to environmental interference, shields the audio transmission channel at the moment, keeps outputting the audio carrier signal of the other audio transmission channel, and sends a notification signal to the control host, then the control host sends frequency hopping instructions to the wireless receiving device 200 and the wireless transmitting device 100 respectively, the wireless receiving device 200 performs frequency hopping on the audio transmission channel with the quality lower than the set standard, and the wireless transmitting device 100 responds to the frequency hopping instructions to adjust the frequency of the audio carrier signal output to the audio transmission channel lower than the set standard.
The detailed operation of the first embodiment of the present invention will be further described below.
a first audio transmission channel and a second audio transmission channel are arranged between the wireless transmitting device 100 and the wireless receiving device 200, the wireless transmitting device 100 respectively transmits audio carrier signals with different frequencies to the wireless receiving device 200, and the wireless receiving device 200 reads the signal-to-noise ratio and/or the field strength of the first audio transmission channel and the second audio transmission channel so as to judge the quality of the audio carrier signals of the corresponding transmission channels.
First, an index value for determining the quality of the audio carrier signal, a duration threshold value for the quality of the audio carrier signal being lower than a predetermined standard, and a frequency hopping interval value are preset in the wireless receiving apparatus 200.
When the signal quality of the first audio transmission channel and the second audio transmission channel is not lower than the set standard, the wireless receiving device 200 selects the audio transmission channel with better audio carrier signal quality to output, and continuously detects the above-mentioned indexes.
when the wireless receiving device 200 detects that the quality of the audio carrier signal of one of the first audio transmission channel and the second audio transmission channel is lower than the set standard, the detection is continuously performed, if the quality of the audio carrier signal of the audio transmission channel is higher than the set standard again within the preset time threshold, it is determined that the multipath interference occurs, and at this time, the wireless receiving device 200 only selects the audio transmission channel with better audio carrier signal quality to output, and does not perform other operations.
When the wireless receiving device 200 detects that the quality of the audio carrier signal of one of the first audio transmission channel and the second audio transmission channel is lower than the set standard, the detection is continuously performed, if the quality of the audio carrier signal of the audio transmission channel is still lower than the set standard after exceeding the preset time threshold, it is determined that external interference occurs, and at this time, the wireless receiving device 200 shields the channel of which the quality of the audio carrier signal is continuously lower than the set standard, and simultaneously, the normal output of the audio carrier signal of the other channel is maintained. The wireless receiving device 200 then hops the receiving frequency continuously lower than the set standard channel to a frequency different from the original receiving frequency by a preset interval value, and then detects the frequency, if there is still external interference, then hops continuously according to the preset interval value until a frequency without external interference is hopped. After the frequency hopping of the wireless receiving device 200 is finished, a frequency hopping instruction is sent to the wireless transmitting device 100, the wireless transmitting device 100 changes the transmitting frequency to be consistent with the receiving frequency of the wireless receiving device 200 after receiving the frequency hopping instruction, the two parties handshake to activate the audio transmission channel, and the dual-channel communication is reestablished.
The detailed operation of the second embodiment of the present invention will be further described below.
Compared with the first embodiment, the second embodiment adds a control host, the wireless transmitting device 100 and the wireless receiving device 200 are controlled by the control host, and only the audio carrier signal is transmitted between the wireless transmitting device 100 and the wireless receiving device 200.
A first audio transmission channel and a second audio transmission channel are arranged between the wireless transmitting device 100 and the wireless receiving device 200, the wireless transmitting device 100 respectively transmits audio carrier signals with different frequencies to the wireless receiving device 200, and the wireless receiving device 200 reads the signal-to-noise ratio and/or the field strength of the first audio transmission channel and the second audio transmission channel so as to judge the quality of the audio carrier signals of the corresponding transmission channels.
Firstly, an index value for judging the quality of the audio carrier signal, a duration time threshold value for judging that the quality of the audio carrier signal is lower than a preset standard and a frequency hopping interval value are preset through a control host.
When the signal quality of the first audio transmission channel and the second audio transmission channel is not lower than the set standard, the wireless receiving device 200 selects the audio transmission channel with better audio carrier signal quality to output, and continuously detects the above-mentioned indexes.
when the wireless receiving device 200 detects that the quality of the audio carrier signal of one of the first audio transmission channel and the second audio transmission channel is lower than the set standard, the detection is continuously performed, if the quality of the audio carrier signal of the audio transmission channel is higher than the set standard again within the preset time threshold, it is determined that the multipath interference occurs, and at this time, the wireless receiving device 200 only selects the audio transmission channel with better audio carrier signal quality to output, and does not perform other operations.
When the wireless receiving device 200 detects that the quality of the audio carrier signal of one of the first audio transmission channel and the second audio transmission channel is lower than the set standard, the detection is continuously performed, if the quality of the audio carrier signal of the audio transmission channel is still lower than the set standard after exceeding the preset time threshold, it is determined that external interference occurs, and at this time, the wireless receiving device 200 shields the channel of which the quality of the audio carrier signal is continuously lower than the set standard, and simultaneously, the normal output of the audio carrier signal of the other channel is maintained. Meanwhile, the wireless receiving device 200 sends a notification signal to the control host, the control host sends a frequency hopping command to the wireless receiving device 200 and the wireless transmitting device 100, the wireless receiving device 200 then hops the receiving frequency continuously lower than the set standard channel to the frequency different from the original receiving frequency by the preset interval value, then detects the frequency, and if external interference still exists, continuously hops the frequency according to the preset interval value until the frequency is hopped to the frequency without the external interference. The radio transmitter apparatus 100 also changes the transmission frequency to be identical to the reception frequency of the radio receiver apparatus 200 after receiving the frequency hopping instruction, and the two parties handshake the audio transmission channel to reestablish the two-channel communication.
In order to improve the frequency hopping efficiency, the control host may be connected to a spectrum analyzer, perform comprehensive analysis on the field spectrum resources of the wireless receiving device 200 and the wireless transmitting device 100 to obtain the frequency with the best signal quality, and send a frequency hopping command to the wireless receiving device 200 and the wireless transmitting device 100 to directly perform frequency hopping.
two audio transmission channels are established between the wireless transmitting device 100 and the wireless receiving device 200, audio carrier signals with different frequencies are transmitted respectively, and the same wireless transmitting device 100 is used for transmitting the audio carrier signals with different frequencies, so that one channel with better signals can be selected for communication. When the situation that one path is continuously interfered is detected, the other path can be automatically switched to transmit the audio carrier signals, and the frequency of the channel with continuous interference is changed, so that the two paths of audio carrier signals are ensured to be in a communicable state, a backup function is realized, the communication between the wireless transmitting device 100 and the wireless receiving device 200 is not interrupted when the interference occurs, and the user experience and the use reliability are effectively improved.
Above, only the preferred embodiment of the present invention has been described, the present invention is not limited to the above embodiment, and the technical effects of the present invention can be achieved by the same means, which all belong to the protection scope of the present invention.
Claims (10)
1. A wireless microphone system, comprising:
the wireless transmitting device outputs two paths of audio carrier signals with different frequencies;
The wireless receiving device and the wireless transmitting device are provided with a first audio transmission channel and a second audio transmission channel which have different carrier frequencies;
the wireless transmitting device outputs two paths of audio carrier signals with different frequencies to the wireless receiving device through the first audio transmission channel and the second audio transmission channel respectively.
2. A wireless microphone system according to claim 1, wherein: the wireless transmitting device generates two carrier frequencies through two paths of completely independent frequency synthesis circuits, the two carrier frequencies are amplified by the same path of microphone signals and respectively modulated by the two paths of frequency synthesis circuits to generate two frequency modulation frequencies, the two paths of audio carrier signals with different frequencies are output after power amplification, and the modulation signal sources and the modulation parameters of the two paths of audio carrier signals with different frequencies are consistent; the two paths of audio carrier signals with different frequencies are respectively transmitted to the wireless receiving device through the first audio transmission channel and the second audio transmission channel, and the wireless receiving device demodulates and restores the two paths of audio signals by using the frequencies corresponding to the first audio transmission channel and the second audio transmission channel.
3. A wireless microphone system according to claim 1, wherein: wireless transmitting device includes adapter, pickup amplifier, first frequency synthesis circuit, second frequency synthesis circuit, amplifier, first audio frequency modulator, second audio frequency modulator, first MCU and power amplifier, the adapter is connected with pickup amplifier, pickup amplifier passes through respectively first frequency synthesis circuit and second frequency synthesis circuit connect the amplifier, the amplifier is connected respectively first audio frequency modulator and second audio frequency modulator, first audio frequency modulator and second audio frequency modulator respectively with first MCU connects, first audio frequency modulator and second audio frequency modulator produce respectively two different audio frequency carrier signal send to power amplifier enlargies the back output.
4. A wireless microphone system according to claim 3, wherein: the first audio modulator or the second audio modulator comprises a first PLL and a first VCO, the first PLL is connected with the first VCO, the first VCO is connected with the amplifier, and the first PLL and the first VCO are respectively connected with the first MCU.
5. A wireless microphone system according to claim 3, wherein: the first frequency synthesis circuit or the second frequency synthesis circuit comprises a pre-emphasis circuit and a dynamic compander, and the pickup amplifier, the pre-emphasis circuit, the dynamic compander and the amplifier are sequentially connected.
6. A wireless microphone system according to claim 3, wherein: the two audio carrier signals generated by the first audio modulator and the second audio modulator are alternately input into the power amplifier.
7. A wireless microphone system according to claim 1, wherein: the wireless receiving device comprises two paths of demodulation circuits, wherein each demodulation circuit comprises an LNA (low-noise amplifier), a first mixer, a third frequency synthesis circuit, a second mixer, an IF (intermediate frequency) amplifier and an FM (frequency modulation) demodulator, the LNA amplifiers, the first mixer, the second amplifier and the FM demodulator are sequentially connected, and the third frequency synthesis circuit is connected between the first mixer and the second mixer; the third frequency synthesis circuit, the FM demodulator and the selection switch are respectively connected with the second MCU.
8. a wireless microphone system according to claim 7, wherein: the third frequency synthesis circuit comprises an A path of first VCO, an A path of PLL and an A path of second VCO, wherein the A path of first VCO, the A path of PLL and the A path of second VCO are sequentially connected, the A path of first VCO is connected with the first mixer, the A path of second VCO is connected with the second mixer, and the A path of PLL is connected with the second MCU.
9. A wireless microphone system according to any of claims 1-8, wherein: and a data channel for transmitting the control signal is established between the wireless transmitting device and the wireless receiving device.
10. A wireless transmitting apparatus, characterized in that: including first MCU, adapter, power amplifier, be used for exporting two ways different frequency's audio carrier signal's first audio modulator and second audio modulator respectively, first audio modulator and second audio modulator input are come from the same audio signal of adapter, power amplifier respectively with first audio modulator and second audio modulator's output is connected, first audio modulator and second audio modulator are connected with first MCU respectively.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2018209777974 | 2018-06-22 | ||
| CN201820977797 | 2018-06-22 |
Publications (1)
| Publication Number | Publication Date |
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| CN209787155U true CN209787155U (en) | 2019-12-13 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112804736A (en) * | 2021-01-07 | 2021-05-14 | 昆腾微电子股份有限公司 | Data transmission method, data processing method and wireless microphone system |
| CN114337724A (en) * | 2021-12-31 | 2022-04-12 | 科大讯飞股份有限公司 | Wireless communication method, device and equipment based on dual-channel technology |
| CN115276707A (en) * | 2022-07-27 | 2022-11-01 | 深圳市中诺无线科技有限公司 | 2.4G wireless digital audio transmission circuit |
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2019
- 2019-05-06 CN CN201920639908.5U patent/CN209787155U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112804736A (en) * | 2021-01-07 | 2021-05-14 | 昆腾微电子股份有限公司 | Data transmission method, data processing method and wireless microphone system |
| CN112804736B (en) * | 2021-01-07 | 2022-09-02 | 昆腾微电子股份有限公司 | Data transmission method, data processing method and wireless microphone system |
| CN114337724A (en) * | 2021-12-31 | 2022-04-12 | 科大讯飞股份有限公司 | Wireless communication method, device and equipment based on dual-channel technology |
| CN114337724B (en) * | 2021-12-31 | 2024-04-30 | 科大讯飞股份有限公司 | Wireless communication method, device and equipment based on dual-channel technology |
| CN115276707A (en) * | 2022-07-27 | 2022-11-01 | 深圳市中诺无线科技有限公司 | 2.4G wireless digital audio transmission circuit |
| CN115276707B (en) * | 2022-07-27 | 2023-11-24 | 深圳市中诺无线科技有限公司 | 2.4G wireless digital audio transmission circuit |
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