CN115395969A - Anti-interference analog audio receiving demodulation method, transmitting modulation method and system - Google Patents
Anti-interference analog audio receiving demodulation method, transmitting modulation method and system Download PDFInfo
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- H04B1/06—Receivers
- H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
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- 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
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Abstract
The application discloses an anti-interference analog audio receiving and demodulating method, an emitting and modulating method and an anti-interference analog audio receiving and demodulating system, wherein the anti-interference analog audio receiving and demodulating method adopts a second receiving module to detect the quality of a current analog audio signal and judges whether the quality of the analog audio signal is within a preset threshold value range to determine whether channels need to be switched or not so as to avoid an interference channel; the anti-interference analog audio frequency emission modulation method judges whether a switching instruction of an optimal channel is received or not through a third receiving module, if so, channel switching confirmation information is sent through a second emitting module, and then channel frequency is switched to the optimal channel frequency, so that an interference channel is avoided; it also relates to a system using a receiver and a transmitter, which use the above two methods to avoid interfering frequency points.
Description
Technical Field
The application relates to the field of wireless microphones, in particular to an anti-interference analog audio receiving demodulation method, an anti-interference analog audio transmitting modulation method and an anti-interference analog audio transmitting modulation system.
Background
The use of wireless microphones always faces the problem of crosstalk, and in order to avoid the interference of interfering audio frequency points, wireless microphones in the market usually call out a better channel manually, then carry out frequency conversion manually, so that the labor cost is too high, and the best frequency point is not easy to call out. In addition, in the prior art, the transmission signal between the modules is digital audio, and the requirement is high, so the manufacturing cost is also increased.
Therefore, an analog audio signal technology capable of automatically avoiding the interference frequency point is urgently proposed.
Disclosure of Invention
The application provides an anti-interference analog audio receiving and demodulating method, an anti-interference analog audio transmitting and modulating method and an anti-interference analog audio transmitting and modulating system, which can reduce production cost, improve the stability of a wireless microphone in use, improve working efficiency and improve experience of a user.
In a first aspect, the present application discloses an anti-interference analog audio receiving and demodulating method, including:
respectively simulating audio signals in real time through a first receiving module and a second receiving module;
demodulating the analog audio signal through the first receiving module, detecting the quality of the current analog audio signal through the second receiving module, and judging whether the quality of the analog audio signal is within a preset threshold range;
if the quality of the analog audio signal is within the preset range, the second receiving module continues to detect the quality of the current analog audio signal;
if the quality of the analog audio signal is not within the preset range, controlling the second receiving module to perform channel scanning and determining an optimal channel;
transmitting a switching instruction of the optimal channel through a first transmitting module;
and judging whether channel switching confirmation information is received or not, and controlling the first receiving module and the second receiving module to switch channels if the channel switching confirmation information is received.
In an embodiment, the detecting, by the second receiving module, the quality of the current analog audio signal and determining whether the quality of the analog audio signal is within a preset threshold range includes the following sub-steps:
acquiring the analog audio signal in a channel in real time through the second receiving module;
analyzing the analog audio signal through the second receiving module to obtain an RSSI value of the analog audio signal;
and judging whether the RSSI value of the analog audio signal is lower than a preset threshold value through the second receiving module.
In one embodiment, the demodulating the analog audio signal by the first receiving module includes the sub-steps of:
receiving the analog audio signal;
sequentially filtering, amplifying and filtering the analog audio signal;
mixing the oscillation frequency generated by the voltage level oscillator and the phase-locked loop with the amplified and filtered analog audio signal to form an intermediate frequency signal;
performing intermediate frequency band-pass filtering on the intermediate frequency signal;
and demodulating the analog audio signal.
In an embodiment, the first receiving module further includes the following sub-steps after demodulating the analog audio signal:
the first receiving module amplifies and expands the demodulated audio signal;
and the first receiving module outputs the amplified audio signal to an external device.
In an embodiment, the controlling the second receiving module to perform channel scanning and determining the best channel includes the following steps:
scanning the analog audio signal in a full frequency domain through the second receiving module;
and taking the audio frequency with the maximum RSSI value of the scanned analog audio signal as the optimal channel.
In a second aspect, the application discloses an anti-jamming analog audio frequency emission modulation method, which includes:
acquiring sound in real time through the audio input module, converting the sound into an analog audio signal, and sending the analog audio signal to the outside through the second transmitting module;
judging whether a third receiving module receives a switching instruction of an optimal channel, and if so, sending channel switching confirmation information through the second transmitting module;
the channel frequency is switched to the optimum channel frequency.
In an embodiment, the acquiring of the sound in real time by the audio input module, converting the sound into an analog audio signal, and sending the analog audio signal to the outside by the second transmitting module includes the following sub-steps:
acquiring sound in real time through an audio input module, and converting the sound into a first analog audio signal;
sequentially amplifying and voice compressing the first analog audio signal to form a second analog audio;
oscillating and amplifying the second analog audio signal to form a third analog audio;
and transmitting the third analog audio signal through a second transmitting module.
In an embodiment, the determining whether the third receiving module receives the switching instruction of the best channel, and if so, sending the channel switching confirmation message through the second transmitting module includes the following substeps:
the third receiving module receives a switching instruction of the optimal channel;
controlling a phase-locked loop to send out a certain frequency and transmit the frequency to an oscillator to oscillate to form confirmation information of a primary optimal channel;
amplifying the analog audio of the preliminary optimal channel to form channel switching confirmation information;
and sending channel switching confirmation information through the second transmitting module.
In one embodiment, the switching the channel frequency to the optimal channel frequency comprises the following sub-steps:
controlling a phase-locked loop to generate a certain frequency to be mixed with the frequency generated by the oscillator;
switching to the optimal channel frequency.
In a third aspect, the present application discloses an anti-jamming analog audio demodulation system, comprising: a receiver and a transmitter;
the receiver includes:
the first receiving module is used for receiving and demodulating the analog audio signal;
the second receiving module is used for receiving the analog audio signal, detecting the quality of the current analog audio signal and judging whether the quality of the analog audio signal is within a preset threshold range;
the first processing module is used for sending a channel switching instruction through the first transmitting module according to the optimal channel determined by the second receiving module and controlling the first receiving module to switch the optimal channel;
the transmitter includes:
an audio input module: for converting external sound into an analog audio signal;
a second transmitting module: the analog audio signal processing device is used for sending the processed analog audio signal to a receiver;
a third receiving module: the system is used for receiving an optimal channel switching instruction sent by the receiver;
a second processing module: and the third receiving module is used for controlling the channel switching confirmation information sent by the second transmitting module and switching the optimal channel.
Therefore, the anti-interference analog audio receiving and demodulating method, the transmitting and modulating method and the anti-interference analog audio receiving and demodulating system can detect the quality of the current analog audio signal and judge the quality of the analog audio signal through the second receiving module, can determine the optimal channel, interact with the transmitter, and switch the channel frequency to the optimal channel frequency, so that the influence of interference frequency points on the interaction of the transmitter and the receiver is effectively avoided, the working stability of the wireless microphone is improved, and the experience of a user is improved.
Drawings
Fig. 1 is a flowchart of a first implementation of an anti-interference analog audio receiving and demodulating method provided in embodiment 1 of the present application.
Fig. 2 is a flowchart of a second implementation of the interference-immune analog audio receiving and demodulating method according to embodiment 1 of the present application.
Fig. 3 is a flowchart of a third implementation of the interference-free analog audio receiving and demodulating method according to embodiment 1 of the present application.
Fig. 4 is a flowchart of a fourth implementation of the interference-immune analog audio receiving and demodulating method according to embodiment 1 of the present application.
Fig. 5 is a flowchart of a first implementation of the anti-jamming analog audio frequency transmission modulation method according to embodiment 2 of the present application.
Fig. 6 is a flowchart of a first implementation of the interference-immune analog audio system according to embodiment 3 of the present application.
Fig. 7 is a diagram of a receiver architecture of an analog audio system resistant to interference provided in embodiment 3 of the present application.
Fig. 8 is a diagram of a transmitter architecture of an analog audio system that is resistant to interference provided in embodiment 3 of the present application.
Detailed Description
The technical solution of the present application is further described below with reference to the accompanying drawings and examples.
Example 1:
the embodiment of the application provides an anti-interference analog audio receiving and demodulating method which is applied to a wireless microphone.
Referring to fig. 1, a flow chart of implementing the anti-interference analog audio receiving and demodulating method according to the embodiment of the present application is shown.
As shown in fig. 1, the method for receiving and demodulating the analog audio with interference resistance includes:
100. the audio signal is simulated in real time by the first receiving module 12 and the second receiving module, respectively.
The analog audio signal is obtained by picking up external sound by an external device, and the analog audio signal obtained by processing the external sound is transmitted to the first receiving module 12 and the second receiving module, so that the first receiving module 12 and the second receiving module receive the analog audio signal in real time.
101. The analog audio signal is demodulated by the first receiving module 12.
102. And meanwhile, detecting the quality of the current analog audio signal through a second receiving module, and judging whether the quality of the analog audio signal is within a preset threshold range.
In order to determine whether the real-time analog audio signal is interfered, the second receiving module monitors the real-time analog audio signal. Wherein, in the using process, the setting of the threshold value is preset in a register in the chip. In addition, the chip models are different, the threshold values are different, and the chip models can be selected according to the use requirements.
103. If the quality of the analog audio signal detected by the second receiving module is within the preset threshold range, which indicates that the interference of the analog audio signal at the moment is less, the second receiving module continues to detect the current analog audio quality.
104. If the quality of the analog audio signal is not within the preset threshold value range, the interference in the channel is indicated. The second receiving module scans channels, determines the best channel in all the channel scanning results, and can avoid the interference of the interference frequency point by receiving the audio signal.
Therefore, the method realizes the anti-interference of the interference frequency point on the premise of realizing the inherent normal function.
105. The switching instruction of the best channel is sent through the first transmitting module 14.
And transmitting the frequency of the monitored best channel to an associated external device for receiving.
106. And judging whether the confirmation information of channel switching is received.
107. If the confirmation information of channel switching is received, the receiving frequencies of the first receiving module 12 and the second receiving module are controlled to be switched to the frequency of the optimal channel.
Therefore, interference frequency points are excluded, and anti-interference is achieved.
The first receiving module 12 and the second receiving module may be the same module on the premise that the function can be realized, that is, the realization manner of the first receiving module and the second receiving module is still the same, so that the present application does not limit this.
In one embodiment, as shown in fig. 2, the method for demodulating the analog audio signal by the first receiving module 12 is as follows:
1010. the first receiving module 12 receives an analog audio signal.
1011. And sequentially performing band-pass filtering, low-noise amplification and band-pass filtering on the analog audio signal.
1012. The analog audio signal obtained by the filtering and amplification is mixed with the frequency generated by the voltage level oscillator and the phase-locked loop of the first receiving module 12 to obtain an intermediate frequency signal.
1013. If intermediate frequency band-pass filtering is performed on the intermediate frequency signal, the audio is demodulated.
In order to demodulate the received analog audio and transmit the demodulated audio to an external device, the analog audio is amplified and filtered for a plurality of times.
In one embodiment, as shown in fig. 3, after the first receiving module 12 demodulates the analog audio signal, it further performs the following processing:
1014. the analog audio signal is amplified.
1015. And expanding the amplified analog audio signal by an expander.
1016. And outputting the expanded analog audio signal to external equipment.
Since in some embodiments the analog audio is compressed while it is being acquired and processed, it is expanded and restored to give the analog audio signal a gain that facilitates processing at a later stage.
In an embodiment, please refer to fig. 4, when the second receiving module 13 detects the quality of the current analog audio signal, the following method is used to determine whether the quality of the analog audio signal is within the preset threshold range:
1020. the second receiving module 13 acquires the analog audio signal in the channel in real time.
1021. The second receiving module 13 analyzes the obtained analog audio signal, and correspondingly obtains an RSSI value of the analog audio signal.
1022. And judging the RSSI value of the analog audio signal, wherein whether the RSSI value of the analog audio signal is lower than a preset threshold value or not.
The quality of the analog audio signal in this embodiment is represented by the corresponding RSSI value. When the RSSI value of the analog audio signal is lower than the preset threshold, which indicates that there is interference, it is necessary to switch the channel with the highest RSSI value. When the RSSI value of the analog audio signal is higher than/equal to the preset threshold, it indicates that the interference is small at this time, and it is not necessary to switch channels.
In an embodiment, a specific method for controlling the second receiving module 13 to perform channel scanning and determine the best channel is as follows:
1040. the second receiving module 13 first performs a full frequency domain scan on the analog audio signal.
1041. And taking the audio frequency with the maximum RSSI value corresponding to the scanned analog audio signal as an optimal channel.
It should be noted that: the above mentioned preset threshold is a value of RSSI, the quality of the analog audio signal is measured by the RSSI, and only when the RSSI obtained by scanning the analog audio signal is greater than or equal to the preset threshold, the frequency channel of the analog audio signal is of good quality, that is, the available analog audio signal, but the second receiving module 13 switches the channel with the maximum RSSI as the best channel.
Example 2:
the embodiment of the application provides an anti-interference analog audio frequency emission modulation method which is applied to a wireless microphone.
Referring to fig. 5, a flow chart of implementing the anti-interference analog audio frequency transmission modulation method according to the embodiment of the present application is shown.
As shown in fig. 5, the anti-jamming analog audio frequency emission modulation method includes:
200. the audio input module 22 acquires sound in real time, converts the sound into an analog audio signal, and the analog audio signal is transmitted to the outside through the second transmitting module 23.
201. Determine whether the third receiving module 24 receives the switching instruction of the best channel
202. If yes, sending channel switching confirmation information through the second sending module 23.
203. And simultaneously, the channel frequencies of the second transmitting module 23 and the third receiving module 24 are switched to the optimal channel frequency.
The anti-interference analog audio frequency emission modulation method picks up external sound, converts the sound into an analog audio frequency signal, enables the analog audio frequency signal to be transmitted in a circuit, and finally sends the analog audio frequency signal to the outside, and is received by other related equipment for further processing. And can judge whether the third receiving module 24 receives the switching instruction, and if the switching instruction is received, it will send a confirmation, and implement synchronous frequency conversion with other associated devices without affecting the use.
In an embodiment, the real-time acquisition of the sound by the audio input module 22, the conversion of the sound into an analog audio signal, and the transmission to the outside by the second transmitting module 23 may be:
2000. the sound is captured in real time by the audio input module 22 and converted into a first analog audio.
2001. And amplifying the first analog audio through an amplifier, and compressing the first analog audio according to a certain compression ratio to form a second analog audio.
2002. And mixing the frequency generated by the oscillator with the second analog audio frequency, and pre-amplifying and re-amplifying the mixed analog audio signal to form a third analog audio.
2003. The third analog audio signal is transmitted through the second transmitting module 23.
The first analog audio converted by the audio input module 22 is subjected to a series of processing, wherein a certain gain is given, the frequency is increased, and finally, the output third analog audio signal can be processed more accurately by the subsequent stage.
In an embodiment, the determining whether the third receiving module 24 receives the switching instruction of the optimal channel, and if yes, sending the channel switching confirmation message through the second transmitting module 23 may be:
2010. when the third receiving module 24 receives the switching instruction of the best channel.
2011. And controlling the phase-locked loop to send out a certain frequency to be transmitted to the oscillator to oscillate to form the confirmation information of the initial optimal channel.
2012. And amplifying the analog audio of the initial optimal channel to form channel switching confirmation information.
2013. The channel switching confirmation information is transmitted through the second transmitting module 23.
When the third receiving module 24 receives the switching instruction of the optimal channel, the phase-locked loop is controlled to send a certain frequency to the oscillator to form the confirmation information of the optimal channel, so as to perform frequency conversion contact with the external device.
In an embodiment, the switching of the channel frequency of the second transmitting module 23 and the third receiving module 24 to the optimal channel frequency at the same time may be:
2030. the phase-locked loop is controlled to generate a certain frequency to be mixed with the frequency generated by the oscillator.
2031. The frequency of the best channel can be switched.
Finally, the autonomous frequency conversion is realized through the operation, and the influence of interference frequency points on signal transmission is avoided.
Example 3:
referring to fig. 6, a flow chart of the cooperation of the receiver 1 and the transmitter 2 of the interference-free analog audio demodulation system 3 according to the embodiment of the present application is shown.
The anti-jamming analog audio demodulation system employs a receiver 1 and a transmitter 2.
Wherein:
referring to fig. 7, the receiver 1 includes:
a first receiving module 12, configured to receive and demodulate the analog audio signal.
The second receiving module 13 is configured to receive the analog audio signal, detect the quality of the current analog audio signal, and determine whether the quality of the analog audio signal is within a preset threshold range.
The first processing module 11 is configured to send a channel switching instruction through the first transmitting module 14 according to the optimal channel determined by the second receiving module 13, and control the first receiving module 12 to switch the optimal channel.
Referring to fig. 8, the transmitter 2 includes:
the audio input module 22: for converting external sound into an analog audio signal.
The second transmitting module 23: for transmitting the processed analog audio signal to a receiver.
The third receiving module 24: for receiving the best channel switching instruction sent by the receiver.
The second processing module 21: for controlling to send the channel switching confirmation information through the second transmitting module 23, and the third receiving module 24 switches the best channel.
The specific work flow is as follows:
in order to convert the sound into a signal that can be transmitted in the circuit, the second processing module 21 acquires the sound in real time through the audio input module 22, and converts the sound into a first analog audio signal.
For the purpose of subsequent processing, the second processing module 21 amplifies the current signal and then compresses it into a second analog audio signal with a shorter frequency.
In order to convert the dc analog audio signal into an ac analog audio signal, the second processing module 21 controls the transmitting module to oscillate the second analog audio frequency, and then amplifies the second analog audio frequency to form a third analog audio frequency.
The second processing module 21 transmits the third analog audio signal through the second transmitting module 23.
The first processing module 11 respectively receives the third analog audio signal in real time through the first receiving module 12 and the second receiving module 13;
the first processing module 11 demodulates the third analog audio signal through the first receiving module 12, and in order to detect whether an interference frequency point appears in the surrounding environment, receives and detects the quality of the third analog audio signal through the second receiving module 13, and determines whether the quality of the third analog audio signal is within a preset threshold range.
In order to avoid interference of interference frequency points in the surrounding environment and select a channel without interference to transmit signals, the first processing module 11 controls the second receiving module 13 to detect the quality of the third analog audio signal, if the quality is within a preset range, the second receiving module 13 continues to detect the quality of the current analog audio signal, that is, continues to detect the RSSI value of the analog audio signal; if the first processing module 11 determines that the RSSI value of the third analog audio signal is not within the preset range, the second receiving module 13 is controlled to measure the RSSI value, and determine the best channel, i.e. the channel with the largest RSSI value.
In order for the transmitter 2 to receive the frequency of the optimal channel, the first processing module 11 transmits a switching instruction of the optimal channel through the first transmitting module 14;
the second processing module 21 determines whether the third receiving module 24 receives the switching instruction of the optimal channel, and if so, before the frequency conversion of the transmitter 2, the second processing module 21 maintains the original frequency transmission channel switching confirmation information through the second transmitting module 23, so as to ensure that the transmitter 2 and the receiver 1 can simultaneously perform frequency conversion without affecting the transmission of the analog audio signal in the process of avoiding interference.
The first processing module 11 determines whether the channel switching confirmation message is received, and if yes, the first processor and the second processor switch to the best channel, that is, the transmitter 2 and the receiver 1 perform synchronous frequency conversion.
It should be understood that the above-described embodiments of the present application are only examples for clearly illustrating the present application, and are not intended to limit the manner in which the present application is constructed. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. This need not be exhaustive of all the ways in which construction can be accomplished. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present application shall be included in the protection scope of the claims of the present application.
Claims (10)
1. An interference-free analog audio reception demodulation method, comprising:
respectively simulating audio signals in real time through a first receiving module and a second receiving module;
demodulating the analog audio signal through the first receiving module, detecting the quality of the current analog audio signal through the second receiving module, and judging whether the quality of the analog audio signal is within a preset threshold range;
if the quality of the analog audio signal is within the preset range, the second receiving module continues to detect the quality of the current analog audio signal;
if the quality of the analog audio signal is not within the preset range, controlling the second receiving module to perform channel scanning and determining an optimal channel;
transmitting a switching instruction of the optimal channel through a first transmitting module;
and judging whether channel switching confirmation information is received or not, and controlling the first receiving module and the second receiving module to switch channels if the channel switching confirmation information is received.
2. The method of claim 1, wherein said detecting the quality of the current analog audio signal by the second receiving module and determining whether the quality of the analog audio signal is within a predetermined threshold comprises the sub-steps of:
acquiring the analog audio signal in a channel in real time through the second receiving module;
analyzing the analog audio signal through the second receiving module to obtain an RSSI value of the analog audio signal;
and judging whether the RSSI value of the analog audio signal is lower than a preset threshold value through the second receiving module.
3. The method of claim 1, wherein said demodulating said analog audio signal via said first receiving module comprises the substeps of:
receiving the analog audio signal;
sequentially filtering, amplifying and filtering the analog audio signal;
mixing the oscillation frequency generated by the voltage level oscillator and the phase-locked loop with the amplified and filtered analog audio signal to form an intermediate frequency signal;
performing intermediate frequency band-pass filtering on the intermediate frequency signal;
and demodulating the analog audio signal.
4. The method according to claim 3, wherein the step of demodulating the analog audio signal by the first receiving module further comprises the following sub-steps:
the first receiving module amplifies and expands the demodulated audio signal;
and the first receiving module outputs the amplified audio signal to an external device.
5. The method of claim 1, wherein said controlling said second receiver module to perform channel scanning and determining the best channel comprises the steps of:
scanning the analog audio signal in a full frequency domain through the second receiving module;
and taking the audio frequency with the maximum RSSI value of the scanned analog audio signal as the optimal channel.
6. An anti-jamming analog audio transmission modulation method, characterized in that the method comprises:
acquiring sound in real time through the audio input module, converting the sound into an analog audio signal, and sending the analog audio signal to the outside through the second transmitting module;
judging whether a third receiving module receives a switching instruction of an optimal channel, and if so, sending channel switching confirmation information through the second transmitting module;
the channel frequency is switched to the optimum channel frequency.
7. The method of claim 6, wherein the capturing of sounds in real time by the audio input module, the converting of sounds into analog audio signals, and the sending to the outside by the second transmitter module comprises the sub-steps of:
acquiring sound in real time through an audio input module, and converting the sound into a first analog audio signal;
sequentially amplifying and voice compressing the first analog audio signal to form a second analog audio;
oscillating and amplifying the second analog audio signal to form a third analog audio;
and transmitting the third analog audio signal through a second transmitting module.
8. The method as claimed in claim 6, wherein said determining whether the third receiving module receives the switching command of the best channel, and if so, sending the channel switching confirmation message through the second transmitting module comprises the following substeps:
the third receiving module receives a switching instruction of an optimal channel;
controlling a phase-locked loop to send out a certain frequency and transmit the frequency to an oscillator to oscillate to form confirmation information of a primary optimal channel;
amplifying the analog audio of the preliminary optimal channel to form channel switching confirmation information;
and sending channel switching confirmation information through the second transmitting module.
9. The interference resistant analog audio transmission modulation method of claim 6 wherein said switching channel frequency to an optimum channel frequency comprises the substeps of:
controlling a phase-locked loop to generate a certain frequency and mixing the frequency generated by the oscillator;
switching to the optimal channel frequency.
10. An anti-jamming analog audio demodulation system, comprising: a receiver and a transmitter;
the receiver includes:
the first receiving module is used for receiving and demodulating the analog audio signal;
the second receiving module is used for receiving the analog audio signal, detecting the quality of the current analog audio signal and judging whether the quality of the analog audio signal is within a preset threshold range;
the first processing module is used for sending a channel switching instruction through the first transmitting module according to the optimal channel determined by the second receiving module and controlling the first receiving module to switch the optimal channel;
the transmitter includes:
an audio input module: for converting external sound into an analog audio signal;
a second transmitting module: the analog audio signal processing device is used for sending the processed analog audio signal to a receiver;
a third receiving module: the system is used for receiving an optimal channel switching instruction sent by the receiver;
a second processing module: and the third receiving module is used for controlling the channel switching confirmation information sent by the second transmitting module and switching the optimal channel.
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| US20090311973A1 (en) * | 2008-06-11 | 2009-12-17 | Quintic Holdings | Radio Transmitter and Radio Receiver with Channel Condition Assessment |
| CN103096213A (en) * | 2013-01-16 | 2013-05-08 | 江门职业技术学院 | Wireless microphone capable of avoiding same frequency interference |
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| US20140270008A1 (en) * | 2013-03-15 | 2014-09-18 | Shure Acquisition Holdings, Inc. | Wireless audio receiver system and method |
| CN104796163A (en) * | 2015-03-12 | 2015-07-22 | 昆腾微电子股份有限公司 | Device and method for realizing automatic frequency correspondence in wireless receiving equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090311973A1 (en) * | 2008-06-11 | 2009-12-17 | Quintic Holdings | Radio Transmitter and Radio Receiver with Channel Condition Assessment |
| CN103096213A (en) * | 2013-01-16 | 2013-05-08 | 江门职业技术学院 | Wireless microphone capable of avoiding same frequency interference |
| CN203039882U (en) * | 2013-01-16 | 2013-07-03 | 江门职业技术学院 | Wireless microphone capable of preventing co-channel interference |
| US20140270008A1 (en) * | 2013-03-15 | 2014-09-18 | Shure Acquisition Holdings, Inc. | Wireless audio receiver system and method |
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