Feedback Suppressor

Abstract

The present invention discloses a feedback suppressor, comprising: an input module, a processing module and an output module, wherein the input module is used to receive external signals, perform gain and volume adjustment on the external signals, and output the signals after gain and volume adjustment in multiple ways to the processing module; the processing module is used to perform automatic mixing processing on a portion of the received signals, perform priority comparison processing on a portion, perform environmental noise elimination on the mixed signal obtained after the processing, perform adaptive feedback suppression and digital frequency shift processing on the signal after environmental noise elimination and a portion of the received signal, and then output it through the output module. The present invention improves the fidelity and sensitivity of the feedback suppressor to sound, and improves the humanization and controllability of the product.

Description

Technical Field

[0001] The present invention relates to the technical field of feedback suppressors, and in particular to a feedback suppressor with five-way XLR input and two-way XLR output, and a feedback suppressor with ten-way XLR input and two-way XLR output. Background Art

[0002] At present, with the rapid development of entertainment and performing arts, and the popularity of business hotel conference rooms, improving the fidelity and sensitivity of microphones and suppressing the howling of microphones are important manifestations of feedback suppressors. Especially for business conference rooms, multimedia rooms, and electronic classrooms, there are higher requirements for improving the sensitivity of microphones. At present, many feedback suppressors on the market do not improve the sound fidelity and sensitivity, are not user-friendly in product use, and cannot meet the needs of actual use. Summary of the invention

[0003] The main purpose of the present invention is to provide a feedback suppressor to improve the fidelity and sensitivity of the feedback suppressor to sound, and to improve the humanization and controllability of the product.

[0004] To achieve the above object, the present invention provides a feedback suppressor, comprising: an input module, a processing module and an output module, wherein:

[0005] The input module is used to receive external signals, adjust the gain and volume of the external signals, and output the signals after gain and volume adjustment to the processing module in multiple ways;

[0006] The processing module is used to perform adaptive feedback suppression and digital frequency shift processing on the received signal part and then output it through the output module.

[0007] The processing module is also used to perform automatic mixing processing on part of the received signal, perform priority comparison processing on part of the signal, eliminate environmental noise on the mixed signal obtained after processing, and perform adaptive feedback suppression and digital frequency shift processing on the signal after environmental noise elimination and part of the received signal before outputting it through the output module.

[0008] The input module includes: five-way composite XLR interface, one music input interface, one line input interface; the processing module includes: an automatic mixing module, a priority comparison module, an environmental noise elimination module, an adaptive feedback suppression and digital frequency shift module connected in sequence; the output module includes: a system output interface, a line output interface, and a recording output interface, wherein:

[0009] All composite XLR interfaces, music input interfaces and line input interfaces receive external signals and make gain and volume adjustments. Four of the composite XLR interfaces receive external signals and input them into the automatic mixing module and output them to the priority comparison module. Another composite XLR interface receives external signals and inputs them into the priority comparison module. Then all composite XLR interface signals are mixed and enter the environmental noise elimination module. The output signal of the environmental noise elimination module is mixed with the output signal of the line input interface and enters the adaptive feedback suppression and digital frequency shift module. The output signal of the adaptive feedback suppression and digital frequency shift module is output to the corresponding system output interface and line output interface through the recording output port, and after tone adjustment and gain control, it is mixed with the output signal of the music input interface and output to the corresponding system output interface, line output interface and recording output interface through gain control.

[0010] The input module includes: ten composite XLR interfaces, one music input interface, one line input interface, and one remote input interface. The processing module includes: an automatic mixing module, a priority comparison module, an environmental noise elimination module, an adaptive feedback suppression and digital frequency shift module connected in sequence. The output module includes: a system output interface, a line output interface, a recording output interface, and a remote output interface.

[0011] In the ten-way composite XLR interface, five of the ways are divided into zone A, and the other five are divided into zone B;

[0012] All composite XLR interfaces, music input interfaces, line input interfaces, and remote input interfaces receive external signals and make gain and volume adjustments. Among them, the four-way composite XLR interfaces in area A and the four-way composite XLR interfaces in area B receive external signals and input them into the automatic mixing module and output them to the priority comparison module. Another composite XLR interface in area A and another composite XLR interface in area B receive external signals and input them into the priority comparison module. Then, all composite XLR interface signals in areas A and B are mixed and input into the environmental noise elimination module. The output signals of the environmental noise elimination modules in areas A and B are mixed together with the output signals of the line input interfaces. The mixed signal is divided into one signal and enters the adaptive feedback suppression and digital frequency shift module. The mixed signal is divided into another signal and output to the remote output interface and the recording output interface after gain adjustment.

[0013] The output signal of the adaptive feedback suppression and digital frequency shift module is output to the corresponding system output interface and line output interface after tone adjustment and gain control;

[0014] The output signal of the remote input interface is mixed with the output signal of the music input interface after independent gain adjustment, and is output to the corresponding system output interface and line output interface through gain control.

[0015] Wherein, the processing module further includes: two echo cancellation modules, one of which is connected to the remote output interface, and the other is connected to the remote input interface. The mixed signal after the output signal of the environmental noise elimination module in the A area and the B area is mixed with the output signal of the line input interface is divided into another signal, which is output to the corresponding echo cancellation module to the remote output interface and output to the recording output interface after gain adjustment;

[0016] The output signal of the remote input interface is input into the corresponding echo cancellation module after independent gain adjustment and mixed with the output signal of the music input interface, and is output to the corresponding system output interface and line output interface through gain control.

[0017] Wherein, the automatic mixing module has a bypass switch, the priority comparison module compares the sizes of the two received interface signals, and the priority comparison module has a bypass switch.

[0018] The environmental noise elimination module is used to eliminate external noise and interference noise, and the threshold of the voice signal eliminated by the environmental noise elimination module is adjustable.

[0019] Among them, the adaptive feedback suppression and digital frequency shifting module is used to process all received composite XLR signals and one line input interface signal. The processing method is to feedback the sound emitted by the speaker to the microphone, process the extra error signal from the multiple composite XLR interface inputs, compare the error signal with the reference signal, attenuate the extra frequency to achieve howling suppression, among which the digital frequency shift is to attenuate the suppressed frequency by 4HZ in the entire frequency band to cover the howling frequency and achieve double howling suppression.

[0020] The adaptive feedback suppression and digital frequency shift module includes a bypass and feedback suppression access switch, a correction test unit and a display screen, and the display screen displays the current working mode and level.

[0021] The feedback suppressor proposed in the embodiment of the present invention includes: an input module, a processing module and an output module. The input module is used to receive external signals, adjust the gain and volume of the external signals, and output the signals after the gain and volume adjustment to the processing module in multiple ways; the processing module is used to perform automatic mixing processing on part of the received signals, perform priority comparison processing on part of the signals, eliminate environmental noise on the mixed signals obtained after the processing, perform adaptive feedback suppression and digital frequency shift processing on the signal after the environmental noise elimination and part of the received signals, and then output them through the output module. Specifically, the present invention proposes a feedback suppressor with five-way XLR input and two-way XLR output, and inputs voice signals from the four XLR interfaces of MIC1-MIC4, and brings them into the automatic mixing module through different gain adjustments. By comparing the amplitudes of different signals, the sensitivity of one of the MICs is greatly improved, and the mixed signal with MIC5 enters the environmental noise elimination module, and enters the adaptive feedback suppression and digital frequency shift module after reducing the external interference noise. The maximum function of the automatic mixing module is: if the MIC1-MIC4 XLR interfaces are used at the same time, it highlights the signal of one of the MIC interfaces, thereby maximally improving the sensitivity of this MIC, that is, the difference between connecting one MIC interface signal and connecting four MIC interface signals, and the delay time of the conversion signal between MIC1-MIC4 is not more than 0.3 seconds, basically achieving seamless signal connection between MICs, and no signal conversion between MIC1-MIC4. The signal with high sound pressure and high sensitivity is double-enhanced by the adaptive feedback suppression and digital frequency shift module, and the frequency accuracy is re-corrected after tone adjustment to maximize the fidelity of the sound, and then distributed to the system output port and the line output port, so as to achieve the effect of improving the voice sensitivity.

[0022] In addition, different types of signals are received through the music input interface, such as CD, DVD and other high-fidelity music signals, which are directly distributed to the system output port and line output port after gain adjustment without any adjustment mode, so that the signal maintains the sound restoration degree, thereby achieving the purpose of high fidelity. The line input interface receives external signals and mixes the MIC XLR interface signals after gain adjustment to enter the adaptive feedback suppression and digital frequency shift module. This interface can independently adjust different external input signal levels, so as to better match the signal input adaptive feedback suppression and digital frequency shift module output to the system output port, so as to meet the use requirements of various different external signals and improve the humanization and controllability of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A circuit structure diagram of a feedback suppressor of the present invention;

[0024] Figure 2 Another circuit structure diagram of the feedback suppressor of the present invention;

[0025] Figure 3 This is another circuit structure diagram of the feedback suppressor of the present invention. DETAILED DESCRIPTION

[0026] It should be understood that the specific embodiments described herein are only used to explain the present invention, and are not used to limit the present invention.

[0027] Reference Figure 1 , Figure 1 The figure is a schematic diagram of a circuit structure of the feedback suppressor of the present invention.

[0028] A feedback suppressor proposed in the present invention comprises: an input module, a processing module and an output module, wherein:

[0029] The input module is used to receive external signals, adjust the gain and volume of the external signals, and output the signals after gain and volume adjustment to the processing module in multiple ways;

[0030] The processing module is used to perform adaptive feedback suppression and digital frequency shift processing on part of the received signal and then output it through the output module; it is further used to perform automatic mixing processing on part of the received signal, perform priority comparison processing on part of the signal, eliminate environmental noise on the mixed signal obtained after processing, and mix the signal after environmental noise elimination with part of the received signal to perform adaptive feedback suppression and digital frequency shift processing and then output it through the output module.

[0031] As an implementation method, Figure 1 As shown, the input module includes: five-way composite XLR interface, one music input interface, and one line input interface; the processing module includes: an automatic mixing module, a priority comparison module, an environmental noise elimination module, an adaptive feedback suppression and digital frequency shift module connected in sequence; the output module includes: a system output interface, a line output interface, and a recording output interface, wherein:

[0032] All composite XLR interfaces, music input interfaces and line input interfaces receive external signals and make gain and volume adjustments. Four of the composite XLR interfaces receive external signals and input them into the automatic mixing module and output them to the priority comparison module. Another composite XLR interface receives external signals and inputs them into the priority comparison module. Then all composite XLR interface signals are mixed and enter the environmental noise elimination module. The output signal of the environmental noise elimination module is mixed with the output signal of the line input interface and enters the adaptive feedback suppression and digital frequency shift module. The output signal of the adaptive feedback suppression and digital frequency shift module is output to the corresponding system output interface and line output interface through the recording output port, and after tone adjustment and gain control, it is mixed with the output signal of the music input interface and output to the corresponding system output interface, line output interface and recording output interface through gain control.

[0033] As another embodiment, Figure 2 As shown, the input module includes: ten-way composite XLR interface, one music input interface, one line input interface, one remote input interface, the processing module includes: an automatic mixing module, a priority comparison module, an environmental noise elimination module, an adaptive feedback suppression and digital frequency shift module connected in sequence, and the output module includes: a system output interface, a line output interface, a recording output interface, and a remote output interface, wherein:

[0034] In the ten-way composite XLR interface, five of the ways are divided into zone A, and the other five are divided into zone B;

[0035] All composite XLR interfaces, music input interfaces, line input interfaces, and remote input interfaces receive external signals and make gain and volume adjustments. Among them, the four-way composite XLR interfaces in area A and the four-way composite XLR interfaces in area B receive external signals and input them into the automatic mixing module and output them to the priority comparison module. Another composite XLR interface in area A and another composite XLR interface in area B receive external signals and input them into the priority comparison module. Then, all composite XLR interface signals in areas A and B are mixed and input into the environmental noise elimination module. The output signals of the environmental noise elimination modules in areas A and B are mixed together with the output signals of the line input interfaces. The mixed signal is divided into one signal and enters the adaptive feedback suppression and digital frequency shift module. The mixed signal is divided into another signal and output to the remote output interface and the recording output interface after gain adjustment.

[0036] The output signal of the adaptive feedback suppression and digital frequency shift module is output to the corresponding system output interface and line output interface after tone adjustment and gain control;

[0037] The output signal of the remote input interface is mixed with the output signal of the music input interface after independent gain adjustment, and is output to the corresponding system output interface and line output interface through gain control.

[0038] Furthermore, the processing module further comprises: two echo cancellation modules, one of which is connected to the remote output interface, and the other is connected to the remote input interface, and the mixed signal after the output signal of the environmental noise elimination module of the A zone and the B zone is mixed with the output signal of the line input interface is divided into another signal, and after gain adjustment, one is output to the corresponding echo cancellation module to the remote output interface, and the other is output to the recording output interface;

[0039] The output signal of the remote input interface is input into the corresponding echo cancellation module after independent gain adjustment and mixed with the output signal of the music input interface, and is output to the corresponding system output interface and line output interface through gain control.

[0040] Wherein, the automatic mixing module has a bypass switch, the priority comparison module compares the sizes of the two received interface signals, and the priority comparison module has a bypass switch.

[0041] The environmental noise elimination module is used to eliminate external noise and interference noise, and the threshold of the voice signal eliminated by the environmental noise elimination module is adjustable.

[0042] Among them, the adaptive feedback suppression and digital frequency shifting module is used to process all received composite XLR signals and one line input interface signal. The processing method is to feedback the sound emitted by the speaker to the microphone, process the extra error signal from the multiple composite XLR interface inputs, compare the error signal with the reference signal, attenuate the extra frequency to achieve howling suppression, among which the digital frequency shift is to attenuate the suppressed frequency by 4HZ in the entire frequency band to cover the howling frequency and achieve double howling suppression.

[0043] The adaptive feedback suppression and digital frequency shift module includes a bypass and feedback suppression access switch, a correction test unit and a display screen, and the display screen displays the current working mode and level.

[0044] The following is a detailed description of the embodiments of the present invention:

[0045] The present invention provides a feedback suppressor with two specifications: a five-way XLR input and a two-way XLR output, and a ten-way XLR input and a two-way XLR output. The difference between the five-way XLR input and the ten-way XLR input is that the input channels are more, and the output functions are the same. In addition, an echo cancellation module, a remote input interface module, and a remote output interface module are added to the ten-way input product, making the product more user-friendly and better controllable.

[0046] Specifically, Figure 1As shown, a feedback suppressor with five-way XLR input and two-way XLR output includes five MIC1-MIC5 composite XLR interfaces, one music input interface (lotus seat), and one line input interface (lotus seat). All MIC composite XLR interfaces receive external signals and first adjust the gain and volume (optional +48V phantom power supply), including MIC1-MIC4 composite XLR interfaces receiving external signal input automatic mixing function module, MIC5 composite XLR interface receiving external signal input priority function module, and then mix all the MIC composite XLR interface signals into the environmental noise elimination module, the environmental noise elimination module output signal mixes one channel, and the line input interface (lotus seat) signal is mixed together and enters the adaptive feedback suppressor + digital frequency shift module, and one side goes directly to the recording output port. After a tone adjustment, it is output, mixed with one music input interface (lotus seat), and output to the corresponding system output LR (male XLR) interface, line output interface (lotus seat), and recording output interface (lotus seat) through gain control.

[0047] like Figure 2 As shown, a feedback suppressor with 10 XLR inputs and 2 outputs includes 10 MIC1-MIC10 composite XLR interfaces, which are divided into MIC1-MIC5 as area A, MIC6-MIC10 as area B, one music input interface (lotus seat), one line input interface (lotus seat), and one remote input interface (lotus seat). All MIC composite XLR interfaces receive external signals and perform gain and volume adjustment first (optional +48V phantom power supply), including MIC1-MIC5 area A and MIC6-MIC10 The composite XLR interface of area B receives external signals and inputs them into the automatic mixing function module. The composite XLR interfaces of MIC5 in area A and MIC10 in area B receive external signals and input them into the priority comparison module. Then, all the composite XLR interface signals of MIC in area A and area B are mixed and input into the environmental noise elimination module. The output signals of the environmental noise elimination modules in area A and area B are mixed and input into the adaptive feedback suppressor + digital frequency shift module (the adaptive feedback suppression and digital frequency shift module referred to in this embodiment). Before inputting the adaptive feedback suppressor + digital frequency shift module, one signal is divided into one signal and then goes to the echo cancellation module to the remote output port (lotus seat) after gain adjustment. One signal goes directly to the recording output port. The remote input interface (lotus seat) signal is input into the echo cancellation module after independent gain adjustment. The mixed signal is mixed after one signal is independently adjusted by the music input interface (lotus seat) and output to the corresponding system output LR (male XLR) interface, line output interface (lotus seat), and recording output interface (lotus seat) through gain control.

[0048] Preferably, the automatic mixing function module receives the MIC1-MIC4 composite XLR interface signal for automatic mixing, makes a comparison through the interface signal sizes of MIC1-MIC4, highlights the sensitivity enhancement value of one of the MIC1-MIC4 signals and enters the next level priority comparison module, and the automatic mixing module has a bypass switch.

[0049] Preferably, the priority comparison module receives the MIC5 composite XLR interface signal, compares the mode output signal with one of the composite XLR signals of MIC1-MIC4 of the automatic mixing through the electronic circuit, and inputs it into the next-level environmental noise elimination module. The MIC5 composite XLR signal has a priority function, and other signals are muted when it is working. It has an absolute priority function, and the priority function module has a bypass switch.

[0050] Preferably, the environmental noise elimination module receives all signals processed by the MIC1-MIC5 priority function for processing, and the voice signals of MIC1-MIC5 below the normal value, such as the noise and interference noise outside the MIC, can be eliminated by this environmental noise elimination module. The threshold eliminated by the environmental noise elimination module function is adjustable.

[0051] Preferably, the adaptive feedback suppressor + digital frequency shift module receives all MIC1-MIC5 composite XLR signals and a group of line input interface (lotus seat) signals for processing. The processing method is to feed back the sound emitted by the speaker to the microphone, and process the extra error signal from the MIC1-MIC5 composite XLR interface input. This error signal is compared with the reference signal, thereby attenuating the extra frequency to achieve the purpose of suppressing howling, and the digital frequency shift is to attenuate the suppressed frequency by 4HZ in the entire frequency band, thereby greatly covering the howling frequency, and playing a double suppression of howling to improve the microphone sensitivity and sound pressure of MIC1-MIC5. This adaptive feedback suppressor + digital frequency shift module contains a bypass and feedback suppression access switch. Press the feedback suppression switch with one button to pop up the bypass (feedback suppression). It has a precise and fast correction test function, which effectively improves the microphone gain after feedback suppression. The display screen clearly expresses the current working mode and level display.

[0052] Preferably, the tone adjustment module receives all signals from the adaptive feedback suppressor + digital frequency shift module, and then distributes them to the system output interface (XLR), the line output interface (lotus cradle) and the recording output interface (lotus cradle).

[0053] Preferably, the echo cancellation module receives a remote input signal after independent gain adjustment, which generally refers to the audio signal in a video conference at a remote output port, which is output from the audio output port (lotus seat) of the front device to the remote input interface (lotus seat) of this connected device.

[0054] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0055] The present invention is a feedback suppressor with five-way XLR input and two-way XLR output. The voice signal is input into the four-way XLR interface of MIC1-MIC4, and brought into the automatic mixing module through different gain adjustments. By comparing the amplitudes of different signals, the sensitivity of one of the MICs is greatly improved and mixed with the signal of MIC5 to enter the environmental noise elimination module (optional function), and the external interference noise is reduced and then enters the adaptive feedback + digital frequency shift module. The maximum function of the automatic mixing module is: if the MIC1-MIC4 XLR interfaces are used at the same time, it highlights the signal of one of the MIC interfaces, thereby maximally improving the sensitivity of this MIC, that is, the difference between connecting one MIC interface signal and connecting four MIC interface signals, and the delay time of the conversion signal between MIC1-MIC4 is not more than 0.3 seconds, basically achieving seamless signal connection between MICs, and no signal is converted between MIC1-MIC4. The signal with high sound pressure and high sensitivity is double-enhanced by the adaptive feedback suppressor + digital frequency shift module, and the frequency accuracy is re-corrected by the tone adjustment module, so as to maximize the fidelity of the sound, and then distributed to the system output interface and the line output interface, so as to achieve the effect of improving the voice sensitivity.

[0056] In addition, the present invention also includes a music input interface (lotus seat) for receiving different types of signals, such as CD, DVD and other high-fidelity music signals which are directly distributed to the system output interface and the line output interface after gain adjustment without any adjustment mode, so that the signal maintains the degree of sound restoration, thereby achieving the purpose of high fidelity. The line input interface (lotus seat) receives external signals, which are mixed with the MIC Canon interface signals after gain adjustment and enter the adaptive feedback suppressor + digital frequency shift module. This interface can independently adjust the levels of different external input signals, thereby better matching the signal input adaptive feedback + digital frequency shift module output to the system output interface, thereby meeting the use requirements of a variety of different external signals.

[0057] More specifically, Figure 1 As shown, the present invention provides a feedback suppressor with five-way XLR input and two-way XLR output, including input ports electrically connected in sequence, an automatic mixing module, a priority comparison module, an environmental noise elimination module, an adaptive feedback suppressor + digital frequency shift module, a tone module, and an output port.

[0058] like Figure 2 As shown, the present invention provides a feedback suppressor with ten-way XLR inputs and two-way XLR outputs, including zone A and zone B input ports of MIC1-MIC10 electrically connected in sequence, zone A and zone B automatic mixing modules, zone A and zone B priority comparison modules, zone A and zone B environmental noise elimination modules, adaptive feedback suppressor + digital frequency shift module, echo cancellation module, remote output interface, remote input interface, tone module, and output port.

[0059] As shown in Figure 3, the present invention provides a feedback suppressor with ten-way XLR inputs and two-way XLR outputs, including zone A and zone B input ports of MIC1-MIC10 electrically connected in sequence, zone A and zone B automatic mixing modules, zone A and zone B priority comparison modules, zone A and zone B environmental noise elimination modules, adaptive feedback suppressor + digital frequency shift module, echo elimination module, remote output interface, remote input interface, tone module, output port, wherein the automatic mixing module, priority comparison module, environmental noise elimination module, and echo elimination module are optional modules.

[0060] Figure 1 The input module is used to receive external audio signals and microphone voice signals. These signals are input to the next level through their own independent gain adjustments. The microphones are connected to balanced composite XLR interfaces MIC1-MIC5. Phantom power supply +48V can be added according to the requirements of the microphone types and then input to the automatic mixing module through their own gain adjustments. Figure 2 The input ports are divided into area A and area B, MIC1-MIC5 are area A, MIC6-MIC10 are area B, and they are respectively input to the automatic mixing module, priority comparison module, and environmental noise elimination module of the next level area A and area B. The remote input interface is connected to the remote output signal of the previous level, and after independent gain adjustment, it enters the echo cancellation module for echo cancellation delay processing. The purpose of this is to improve the call quality of remote video conferencing.

[0061] Figure 1 The automatic mixing module is used to receive the microphone microphone signals after MIC1-MIC4 gain adjustment. It collects the level comparison of each MIC1-MIC4 for mixed comparison, selects the largest MIC signal from one channel for output, and the other three channels of MIC signals automatically reduce the sensitivity to achieve a 4-choice-1 effect, highlighting the sound transmission effect of one MIC channel. The switching speed between MIC1-MIC4 microphone microphones is very fast, with only a time delay of 0.3 seconds, and there will be no sound dropout between switching. This function can be switched with a bypass switch, and can be used or not. When used, it is equivalent to connecting a microphone microphone for sound transmission, which greatly improves the sound transmission effect of this microphone. Bypassing this function is equivalent to connecting MIC1-MIC4 microphone microphones at the same time, which greatly reduces the sound transmission gain of the whole machine, and the mixed signal is then output to the next level.

[0062] Figure 1 The priority comparison module is used to receive signals including input ports and MIC5 composite XLR interface signals. The signal output by the automatic mixing module is compared with the MIC5 signal for reference, and a signal with relatively large signal strength is collected for output, highlighting the priority function. After comparison, the MIC5 signal has an absolute priority function. This absolute priority function acts on the MIC1-MIC4 microphones when the MIC5 signal is added during normal use. MIC1-MIC4 will automatically mute. If the signal output of MIC1-MIIC4 is to be restored, the power supply switch of MIC5 must be turned off. The purpose of MIC5 is to output with absolute priority, which can be used as a BMG emergency fire signal interface. This function can also be switched through a bypass switch. When this function is not used, MIC5 is connected in parallel with one of MIC1-MIC4 to increase the sound transmission gain of the microphone.

[0063] Figure 1 The environmental noise elimination module receives the microphone signal from the front input port, mixes it automatically, and enters the environmental noise elimination module after priority comparison. The signals synchronously entering the microphone include useful voice signals and useless environmental signals, such as the noise of the air conditioner in the use environment, the fan sound in the room, the noise of people walking, etc. If these useless noises are emitted by the speakers, they will affect the sound quality and fidelity of the entire sound field. The addition of the environmental noise elimination module is to filter these useless noises, make processing comparisons on the signal algorithm sampling, and set a threshold value. This threshold adjustment allows signals above the set value to pass through, and signals below the set value will be removed and not allowed to pass through. The threshold of this threshold can be adjusted by a potentiometer, and this function is an optional function.

[0064] Figure 2 , Figure 3 The echo cancellation module is used to receive the signals output by area A and area B to improve the sensitivity, and input them into the echo cancellation module after independent gain adjustment, so as to be outputted remotely to the remote input port of the next device. The echo cancellation module is used to process and eliminate the delay time of audio transmission in the video conference between the two parties, so that the fidelity of the audio signal in the remote video can be improved, and both parties can communicate with high-fidelity voice signals. Generally, the audio signal of a remote video conference will generate a time delay when it is transmitted in the network. After being processed by the echo cancellation module of the utility model, the call quality of both parties in the conference can be greatly improved.

[0065] Figure 1 , Figure 2 , Figure 3The adaptive feedback suppressor + digital frequency shift module is used to receive all signals to improve voice sensitivity, such as conference microphones and wireless microphones. These signals come out of the front input port and pass through the automatic mixing, priority comparison module, and environmental noise elimination module. The useful signal after processing is a high-fidelity signal. This signal enters the adaptive feedback suppressor + digital frequency shift module to improve the sensitivity. The internal data of the adaptive feedback suppression algorithm is called out and used by the single-chip microcomputer. The useful signal after processing is then processed by digital frequency shift to double improve the sensitivity of the useful voice signal, thereby achieving the purpose of high fidelity and high sensitivity. This function is converted by a switch (feedback suppression / bypass). All useful signals can enter the feedback mode function, or bypass the feedback mode function, and enter the pass-through function signal directly output to the next level port. The adaptive feedback suppressor + digital frequency shift module also has a correction function. After entering the feedback suppression function, a correction function is used to make the sound fidelity higher. The correction function is to emit 5 seconds of pink noise in the environment of use to test the defects of the sound field and automatically compensate for the sound frequency, thereby further improving the sensitivity and fidelity of the sound. The correction function, feedback suppression function, bypass function, and feedback suppression output level can all be displayed on one display screen, allowing the machine's working status to be clearly seen.

[0066] Figure 1 , Figure 2 , Figure 3 In the tone module, all microphone voice signals enter a tone adjustment function after being processed by the previous module function, and the processed feedback suppression signal is further adjusted. The bass can be enhanced and the treble can be attenuated, which can make the sound sensitivity higher and the sound fidelity higher. This is a potentiometer adjustment function. When the potentiometer is adjusted to the middle, the voice signal is neither attenuated nor enhanced. If the use environment is complex, these voice signals can be adjusted significantly, highlighting a very user-friendly operation and use during use.

[0067] Figure 1 , Figure 2 , Figure 3The output port includes all output signal interfaces, including two-way XLR output interfaces, a group of line lotus output interfaces, and another group of recording output lotus interfaces. The two-way XLR output interfaces are all system XLR male balanced signal outputs, divided into left channel balanced signal output and right channel balanced output signal. There is a potentiometer that can adjust the gain size in front of the system XLR male output port, so that the output signal size can be adjusted to match the input level of the next level of electro-acoustic equipment. The line lotus output interface is a line unbalanced output level, which is synchronized with the XLR male output port signal but the level size is different. It has an independent gain adjustment output that can match electro-acoustic equipment with different input levels. The recording output lotus interface is for the recording input interface, which can record the useful signals of all MIC XLR interfaces and the transmission signals of the line input lotus input interface. There is an independent gain adjustment potentiometer in front of the recording output interface, which can match the recording and broadcasting machines with different recording input levels. The humanized operation of the output port can better reflect the reliability and operability of the present invention in the existing market product comparison.

[0068] The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A feedback suppressor, characterized in that: include: Input module, processing module and output module, where: The input module is used to receive external signals, adjust the gain and volume of the external signals, and output the signals after gain and volume adjustment to the processing module in multiple ways; The processing module is used to perform adaptive feedback suppression and digital frequency shift processing on the received signal part and then output it through the output module; The feedback suppressor includes a feedback suppressor with five-way XLR input and two-way XLR output or a feedback suppressor with ten-way XLR input and two-way XLR output; When the feedback suppressor includes a feedback suppressor with five-way XLR input and two-way XLR output, the input module includes: a five-way composite XLR interface, a music input interface, and a line input interface; the processing module includes: an automatic mixing module, a priority comparison module, an environmental noise elimination module, an adaptive feedback suppression and digital frequency shift module connected in sequence; the output module includes: a system output interface, a line output interface, and a recording output interface; wherein: All composite XLR interfaces, music input interfaces and line input interfaces receive external signals and make gain and volume adjustments. Four of the composite XLR interfaces receive external signals and input them into the automatic mixing module and output them to the priority comparison module. Another composite XLR interface receives external signals and inputs them into the priority comparison module. Then all composite XLR interface signals are mixed and enter the environmental noise elimination module. The output signal of the environmental noise elimination module is mixed with the output signal of the line input interface and enters the adaptive feedback suppression and digital frequency shift module. The output signal of the adaptive feedback suppression and digital frequency shift module is output to the corresponding system output interface and line output interface through the recording output port, and after tone adjustment and gain control, it is mixed with the output signal of the music input interface and output to the corresponding system output interface, line output interface and recording output interface through gain control.

2. The feedback suppressor according to claim 1, characterized in that: The processing module is also used to perform automatic mixing processing on part of the received signal, perform priority comparison processing on part of the signal, eliminate environmental noise on the mixed signal obtained after processing, and perform adaptive feedback suppression and digital frequency shift processing on the signal after environmental noise elimination and part of the received signal before outputting it through the output module.

3. The feedback suppressor according to claim 1, characterized in that: When the feedback suppressor includes a feedback suppressor with ten-way XLR input and two-way XLR output, the input module includes: ten-way composite XLR interfaces, one-way music input interface, one-way line input interface, and one-way remote input interface; the processing module includes: an automatic mixing module, a priority comparison module, an environmental noise elimination module, an adaptive feedback suppression and digital frequency shift module connected in sequence; the output module includes: a system output interface, a line output interface, a recording output interface, and a remote output interface, wherein: In the ten-way composite XLR interface, five of the ways are divided into area A, and the other five are divided into area B; All composite XLR interfaces, music input interfaces, line input interfaces, and remote input interfaces receive external signals and make gain and volume adjustments. Among them, the four-way composite XLR interfaces in area A and the four-way composite XLR interfaces in area B receive external signals and input them into the automatic mixing module and output them to the priority comparison module. Another composite XLR interface in area A and another composite XLR interface in area B receive external signals and input them into the priority comparison module. Then, all composite XLR interface signals in areas A and B are mixed and input into the environmental noise elimination module. The output signals of the environmental noise elimination modules in areas A and B are mixed together with the output signals of the line input interfaces. The mixed signal is divided into one signal and enters the adaptive feedback suppression and digital frequency shift module. The mixed signal is divided into another signal and output to the remote output interface and the recording output interface after gain adjustment. The output signal of the adaptive feedback suppression and digital frequency shift module is output to the corresponding system output interface and line output interface after tone adjustment and gain control; The output signal of the remote input interface is mixed with the output signal of the music input interface after independent gain adjustment, and is output to the corresponding system output interface and line output interface through gain control.

4. The feedback suppressor according to claim 3, characterized in that: The processing module further includes: two echo cancellation modules, one of which is connected to the remote output interface, and the other is connected to the remote input interface. The mixed signal after the output signal of the environmental noise elimination module in the A zone and the B zone is mixed with the output signal of the line input interface is divided into another signal and outputted to the corresponding echo cancellation module to the remote output interface after gain adjustment, and outputted to the recording output interface at the same time; The output signal of the remote input interface is input into the corresponding echo cancellation module after independent gain adjustment and mixed with the output signal of the music input interface, and is output to the corresponding system output interface and line output interface through gain control.

5. The feedback suppressor according to claim 1 or 3, characterized in that: The automatic mixing module has a bypass switch, and the priority comparison module compares the sizes of the two received interface signals, and the priority comparison module has a bypass switch.

6. The feedback suppressor according to claim 1 or 3, characterized in that: The environmental noise elimination module is used to eliminate external noise and interference noise, wherein the threshold of the voice signal eliminated by the environmental noise elimination module is adjustable.

7. The feedback suppressor according to claim 1 or 3, characterized in that: The adaptive feedback suppression and digital frequency shifting module is used to process all received composite XLR signals and one line input interface signal. The processing method is to feed back the sound emitted by the speaker to the microphone, process the extra error signal from the multi-channel composite XLR interface input, compare the error signal with the reference signal, attenuate the extra frequency to suppress howling, wherein the digital frequency shift attenuates the suppressed frequency by 4HZ in the entire frequency band to cover the howling frequency and achieve double howling suppression.

8. The feedback suppressor according to claim 7, characterized in that: The adaptive feedback suppression and digital frequency shift module includes a bypass and feedback suppression access switch, a correction test unit and a display screen, and the display screen displays the current working mode and level display.

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