CN104244146B - A kind of wireless microphone receiver gain control method - Google Patents
A kind of wireless microphone receiver gain control method Download PDFInfo
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- CN104244146B CN104244146B CN201410475238.XA CN201410475238A CN104244146B CN 104244146 B CN104244146 B CN 104244146B CN 201410475238 A CN201410475238 A CN 201410475238A CN 104244146 B CN104244146 B CN 104244146B
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Abstract
The invention discloses a kind of wireless microphone receiver gain control method, the link of wireless microphone receiver includes microprocessor, Anneta module, RF Amplifier Module, radio frequency sound table filtration module, frequency generation module, frequency mixing module, intermediate frequency sound table filtration module, demodulation module, audio and the attenuation module of control signal processing module and adjustable attenuation, demodulation module and attenuation module concatenation are in a link, the control termination microprocessor of attenuation module, the link gain of demodulation module terminate microprocessor according to output；Microprocessor changes link gain, makes antenna efficiency in the gain ranging of setting according to the pad value of the big minor adjustment attenuation module of link gain data.The gain of the receives link of regulation in real time of the invention, in the case of effectively control noise interference, interference of the third order intermodulation to receives link can be suppressed well, the regulation to wireless microphone system can also be reduced during user's use, preferably realizes intelligent use.
Description
[technical field]
The present invention relates to wireless microphone receiver, more particularly to a kind of wireless microphone receiver gain control method.
[background technology]
Gain-adjusted in wireless communication system is relatively common, and wireless microphone system also has the gain-adjusted of oneself
Pattern, but gain-adjusted is all first to set a numerical value using preceding, no matter launching in conventional wireless microphone system
Or receive, worked in a fixed gain when in use.The frame of conventional wireless microphone receiver receives link
Figure, will when the microphones of two or more than two while when working as shown in figure 1, due to the particularity of wireless microphone system
There is third order intermodulation phenomenon, this can directly influence the stability of microphone system.And the wireless microphone system of fixed gain,
The interference received when there is third order intermodulation can be stronger.So as to cause wireless receiving link disconnected frequency or even the feelings that can not be used occur
Condition.
In addition, the radio frequency sound table filtration module in conventional wireless microphone receiver receives link only has a sound table filtering
Device, its bandwidth is bigger, and is not controlled by CPU.This SAW filter can only broadly perform bandpass filtering action；It is mixed mould
Intermediate frequency amplification module is contained in block, this all can not effectively remove the interference of third order intermodulation.
[content of the invention]
The technical problem to be solved in the present invention is to provide a kind of strong wireless microphone receiver gain of system rejection to disturbance ability
Control method.
In order to solve the above-mentioned technical problem, the technical solution adopted by the present invention is a kind of wireless microphone receiver gain control
Method processed, the link of wireless microphone receiver include microprocessor, Anneta module, RF Amplifier Module, radio frequency sound table filtering mould
Block, frequency generation module, frequency mixing module, intermediate frequency sound table filtration module, demodulation module, audio and control signal processing module and can
The attenuation module of attenuation is adjusted, in a link, the control of attenuation module terminates microprocessor for demodulation module and attenuation module concatenation
Device, the link gain data output termination microprocessor of demodulation module；Microprocessor is according to the big minor adjustments of link gain data
The pad value of attenuation module, change link gain, make antenna efficiency in the gain ranging of setting.
Above-described wireless microphone receiver gain control method, radio frequency sound table filtration module are the filters of radio frequency multi-Channel Acoustic table
Conformance control module, the filtering of radio frequency multi-Channel Acoustic table and control module include the different SAW filter and two of a plurality of centre frequencies
Individual channel selecting control chip；A plurality of SAW filters form a plurality of lead between being connected on two channel selecting control chips
Road, the control terminal of two channel selecting control chips connect microprocessor respectively.
Above-described wireless microphone receiver gain control method, described link include intermediate frequency amplification module and gain
Amplification module, the output termination gain amplification module of attenuation module, the output termination frequency mixing module of gain amplification module, it is mixed mould
The output termination intermediate frequency sound table filtration module of block, the output termination intermediate frequency amplification module of intermediate frequency sound table filtration module, intermediate frequency amplification
Output termination demodulation module, the output ending connecting audio and control signal processing module of demodulation module of module；Audio and control letter
The control signal input of number processing module connects microprocessor.
Above-described wireless microphone receiver gain control method, the output termination RF Amplifier Module of Anneta module,
The output termination radio frequency sound table filtration module of RF Amplifier Module, the output termination attenuation module of radio frequency sound table filtration module.
Above-described wireless microphone receiver gain control method, comprises the following steps：
Microprocessor first determines whether the signal for whether having proper communication in receives link, if not having, control is exited, if having
The signal of proper communication, then by demodulation module, obtain the link gain data of the frequency.
After microprocessor obtains link gain data, according to the normal gain scope of default, real time contrast's link increases
Beneficial data and setting gain data, check link gain whether beyond setting gain data scope；
If beyond the gain data scope of setting, pass through the chain of the current frequency of microprocessor control attenuation module regulation
Road gain, in the gain ranging for the setting that can be worked.
Above-described wireless microphone receiver gain control method, comprises the following steps：
If the regulated quantity of attenuator is beyond setting range, but link gain does not revert to default still
Gain ranging, then send alarm signal.
Wireless microphone receiver gain control method of the present invention adjusts the gain of receives link in real time, in effectively control noise
In the case of interference, interference of the third order intermodulation to receives link can be suppressed well, can also be reduced to nothing during user's use
The regulation of line microphone system, preferably realize intelligent use.
[brief description of the drawings]
The present invention is further detailed explanation with reference to the accompanying drawings and detailed description.
Fig. 1 is the link block diagram of prior art wireless microphone receiver.
Fig. 2 is the link block diagram of wireless microphone receiver of the embodiment of the present invention.
Fig. 3 is the block diagram of the filtering of radio frequency multi-Channel Acoustic of embodiment of the present invention table and control module.
Fig. 4 is the flow chart of wireless microphone receiver gain control method of the embodiment of the present invention.
[embodiment]
The link of wireless microphone receiver of the embodiment of the present invention includes microprocessor, Anneta module, RF Amplifier Module, penetrated
Frequency multi-Channel Acoustic table filters and control module, frequency generation module, frequency mixing module, intermediate frequency sound table filtration module, demodulation module, intermediate frequency
Amplification module, gain amplification module, audio and the attenuation module of control signal processing module and adjustable attenuation.
The output termination RF Amplifier Module of Anneta module, the output termination radio frequency multi-Channel Acoustic table filtering of RF Amplifier Module
And control module, the filtering of radio frequency multi-Channel Acoustic table and the output of control module termination attenuation module.The output termination of attenuation module increases
Beneficial amplification module, the output termination frequency mixing module of gain amplification module, the output termination intermediate frequency sound table filtration module of frequency mixing module,
The output termination intermediate frequency amplification module of intermediate frequency sound table filtration module, output termination demodulation module, the solution mode transfer of intermediate frequency amplification module
The output ending connecting audio and control signal processing module of block.
The control termination microprocessor of attenuation module, the link gain data output termination microprocessor of demodulation module；It is micro-
Processor changes link gain, is setting antenna efficiency according to the pad value of the big minor adjustment attenuation module of link gain data
In fixed gain ranging.
Radio frequency multi-Channel Acoustic table filters and control module includes the different SAW filters and two passages of multiple centre frequencies
Select control chip；Multiple SAW filters form multiple passages, two passages between being connected on two channel selecting control chips
The control terminal of selection control chip connects microprocessor respectively, and microprocessor directly selects controlling switch by I/O control passages.
The control signal input of audio and control signal processing module connects microprocessor.
Wireless microphone receiver of embodiment of the present invention link on the basis of conventional receiver link, add attenuation module and
Corresponding gain amplification module (two-stage radio-frequency gain amplification module), conventional single radio frequency multi-Channel Acoustic table is filtered and controlled
Molding block, it is changed to controllable radio frequency multi-Channel Acoustic table filtering and control module.Simultaneously by routine compound frequency mixing module (i.e. mixing and
Intermediate frequency amplification is built in an IC), it is revised as independent frequency mixing module, intermediate frequency sound table filtration module and intermediate frequency amplification module.
Attenuation module is the rf gain for adjusting whole link.It is placed on radio frequency multi-Channel Acoustic table filter conformance control mould
After block, by adjusting attenuation, the noise interference of intrusion current communications link can be effectively reduced, coordinates gain thereafter
Amplification module, it is ensured that the work of normal communications signal.Attenuation module, is an attenuator in fact, and attenuation module is integrated
Chip, such as HMC542A, connected by SPI interface with microprocessor, perform gain reduction.Conventional receiver link attenuation module
Gain-adjusted is fixed, and the attenuation module of the embodiment of the present invention automatically adjusts attenuation according to link gain situation)
Processing circuitry of intermediate frequency includes frequency mixing module, intermediate frequency sound table filtration module and intermediate frequency amplification module.Conventional mixer module
In contain intermediate frequency amplification, this mode can not effectively remove the interference of third order intermodulation.Above example of the present invention will amplify
Separated with mixing, while middle addition intermediate frequency filtering, the interference of third order intermodulation can be thus effectively reduced, significantly
Strengthen the antijamming capability of receiver.
Radio frequency multi-Channel Acoustic table filters and control module, is improved on the basis of conventional single sound table filtration module
's.It utilizes multiple arrowband SAW filters, is combined into the rf filtering module of an entirety.Traditional radio frequency sound table filtering mould
Block only has a SAW filter, and its bandwidth is bigger, and is not controlled by CPU.This SAW filter can only be wide in range
Perform bandpass filtering action.The radio frequency multi-Channel Acoustic table filtering of the embodiment of the present invention and control module, are by multiple SAW filters
, will be original from narrower bandwidth, and the SAW filter that centre frequency is different with two channel selecting control chips composition
Link communication frequency range be divided into the mode of multiple frequency ranges combination, selection band logical frequency that can be more careful.Penetrate
Frequency range after the filtering of frequency multi-Channel Acoustic table and control module segmentation is narrower, more targeted feature, significantly more efficient progress
Frequency selects, while preferably can also disturb filtering noise information.It is micro- after above example of the present invention starts Intelligent Gain control function
Processor first determines whether the signal for whether having proper communication in receives link.If no, exit Intelligent Gain control.If have just
The signal of normal open letter, then by demodulation module, obtain the link gain data of the frequency.
After microprocessor obtains link gain data, according to the normal gain scope of default, real time contrast's link increases
Beneficial data and setting gain data, check link gain whether beyond setting gain data scope.
If beyond the gain data scope of setting, pass through the chain of the current frequency of microprocessor control attenuation module regulation
Road gain, in the gain ranging for the setting that can be worked.
If the regulated quantity of attenuator is beyond setting range, but link gain does not revert to default still
Gain ranging, then need to give a warning, tell user's current system signal to disconnect, or have strong interferers interference so that
System can not normal work.
On the basis of conventional receiver link, link when adjusting operation of receiver in real time increases above example of the present invention
Benefit, can effectively interference of the less extraneous noise frequency to link.It can effectively suppress third order intermodulation to system simultaneously
Interference, greatly enhance the antijamming capability of system.
Above example of the present invention is controlled using Intelligent Gain so that user is more saved when using wireless microphone system
The heart, it is not necessary to excessive setting is performed to system, just energy high-performance, the work of high-intelligentization.
Claims (4)
1. a kind of wireless microphone receiver gain control method, the link of wireless microphone receiver includes microprocessor, antenna mould
Block, RF Amplifier Module, radio frequency sound table filtration module, frequency generation module, frequency mixing module, intermediate frequency sound table filtration module, demodulation
Module and audio and control signal processing module, it is characterised in that attenuation module of the described link including adjustable attenuation,
Intermediate frequency amplification module and gain amplification module, radio frequency sound table filtration module are the filtering of radio frequency multi-Channel Acoustic table and control module；Radio frequency
Multi-Channel Acoustic table filters and the control terminal of control module, the control of the control terminal of attenuation module, audio and control signal processing module
The link gain data output end of signal input part and demodulation module connects microprocessor respectively；The output termination radio frequency of Anneta module
The input of amplification module, the input of the output termination radio frequency sound table filtration module of RF Amplifier Module, the filtering of radio frequency sound table
The input of the output termination attenuation module of module, the input of the output termination gain amplification module of attenuation module, gain are put
The input of the output termination frequency mixing module of big module, the input of the output termination intermediate frequency sound table filtration module of frequency mixing module,
The input of the output termination intermediate frequency amplification module of intermediate frequency sound table filtration module, the output termination demodulation module of intermediate frequency amplification module
Input, demodulation module output ending connecting audio and control signal processing module input；Microprocessor increases according to link
The pad value of the big minor adjustment attenuation module of beneficial data, change link gain, make antenna efficiency in the gain ranging of setting.
2. wireless microphone receiver gain control method according to claim 1, it is characterised in that radio frequency multi-Channel Acoustic table is filtered
Conformance control module includes the different SAW filters and two channel selecting control chips of a plurality of centre frequencies；A plurality of sound
Table wave filter forms plurality of channels, the control of two channel selecting control chips between being connected on two channel selecting control chips
End connects microprocessor respectively.
3. wireless microphone receiver gain control method according to claim 1, it is characterised in that comprise the following steps：
Microprocessor first determines whether the signal for whether having proper communication in link, if not having, control is exited, if there is proper communication
Signal, then by demodulation module, obtain the link gain data of current frequency；
After microprocessor obtains link gain data, according to the gain ranging of default, real time contrast's link gain data and
The gain data of setting, check link gain whether beyond setting gain ranging；
If beyond the gain ranging of setting, attenuation module is controlled to adjust the link gain of current frequency by microprocessor,
It can be operated in the gain ranging of setting.
4. wireless microphone receiver gain control method according to claim 3, it is characterised in that comprise the following steps：
If the regulated quantity of attenuation module is beyond setting range, but link gain does not revert to the increasing of default still
Beneficial scope, then send alarm signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410475238.XA CN104244146B (en) | 2014-09-17 | 2014-09-17 | A kind of wireless microphone receiver gain control method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410475238.XA CN104244146B (en) | 2014-09-17 | 2014-09-17 | A kind of wireless microphone receiver gain control method |
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| CN104244146A CN104244146A (en) | 2014-12-24 |
| CN104244146B true CN104244146B (en) | 2018-03-06 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101399934A (en) * | 2007-09-27 | 2009-04-01 | 三洋电机株式会社 | Receiving device |
| CN101426111A (en) * | 2007-10-30 | 2009-05-06 | 天钰科技股份有限公司 | Automatic gain control circuit |
| CN201898483U (en) * | 2010-11-11 | 2011-07-13 | 天津光电通信技术有限公司 | USW signal gain controller |
| CN203522662U (en) * | 2013-10-18 | 2014-04-02 | 常州国光数据通信有限公司 | Mixed-control device for gain of short-wave receiver |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20010084821A (en) * | 2000-02-29 | 2001-09-06 | 서평원 | receiving device of base station in mobile communication system |
| JP3586267B2 (en) * | 2002-06-18 | 2004-11-10 | 沖電気工業株式会社 | Automatic gain control circuit |
-
2014
- 2014-09-17 CN CN201410475238.XA patent/CN104244146B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101399934A (en) * | 2007-09-27 | 2009-04-01 | 三洋电机株式会社 | Receiving device |
| CN101426111A (en) * | 2007-10-30 | 2009-05-06 | 天钰科技股份有限公司 | Automatic gain control circuit |
| CN201898483U (en) * | 2010-11-11 | 2011-07-13 | 天津光电通信技术有限公司 | USW signal gain controller |
| CN203522662U (en) * | 2013-10-18 | 2014-04-02 | 常州国光数据通信有限公司 | Mixed-control device for gain of short-wave receiver |
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| Publication number | Publication date |
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| CN104244146A (en) | 2014-12-24 |
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