Howling suppression method and device for multipoint voice communication system

Abstract

The invention relates to the technical field of voice communication, and particularly discloses a squeal suppression method and device for a multipoint voice communication system, and the device comprises an optical fiber, a plurality of groups of communication mechanisms and a plurality of groups of passive filter modules, each group of communication mechanism is in optical fiber communication connection, and each group of passive filter modules is in optical fiber communication connection with the optical fiber. Each group of passive filter modules is embedded in the corresponding communication mechanism, each group of communication mechanism comprises a communication unit, an SIP horn and a network cable, one end of the network cable is in communication connection with the communication unit, and the other end of the network cable is in communication connection with the SIP horn. The stability of a mine belt conveyor roadway multi-point voice communication system and the good, clear and distinguishable quality of voice signals output by the SIP high-power horn are ensured; by adopting a modular design, the system is simple in structure, low in cost, easy to implement and convenient to expand, and has the characteristics of convenience and flexibility in use and simplicity in maintenance.

Description

Technical Field

[0001] The present invention relates to the field of voice communication technology, and in particular to a howling suppression method and device for a multipoint voice communication system. Background Art

[0002] Belt conveyors, also known as belt conveyors, offer advantages such as high transport capacity, long transport distances, low operating resistance, continuous operation, and a long service life. They are widely used in mineral mining and transportation. A multi-point voice communication system for belt conveyor lanes is a crucial instrument for improving the efficiency of belt conveyor monitoring, regular inspections, and maintenance. It effectively assists on-site personnel in collaborative maintenance and overhaul tasks, thereby ensuring reliable operation of belt conveyors and smooth mineral transportation. Therefore, it is necessary to install appropriate communication devices within different belt conveyor lanes to implement broadcast, intercom, and call signal communication functions.

[0003] The space in the belt conveyor tunnel is small and there are many related equipment. The noise generated during the operation of the equipment, after reflection and superposition in the narrow space, the environmental noise within 4m of the belt conveyor exceeds 105dB; in such a large environmental noise, when conducting voice communication, there is a phenomenon that the user's voice is drowned out and the specific voice content cannot be heard clearly; in daily use, calls are made through the IP phone host, and sound amplification is achieved through the high-power SIP horn; in order to overcome the phenomenon of drowning out the user's voice and the inability to hear the specific voice content, the output sound of the high-power SIP horn is required to be large enough; when the output sound of the high-power SIP horn exceeds a certain amplitude, the high-power SIP horn will emit a sharp and harsh sound, that is, howling; when using the IP phone host to call, the voice signal enters the multi-point voice communication system's speech processing channel from the Mic, and after transmission, it is amplified by the high-power SIP horn and output to the outside; afterward, the voice signal output by the high-power SIP horn re-enters the IP phone host through spatial propagation. The mic, voice processing channel, transmission channel, and high-power SIP horn cycle in a cycle, forming positive feedback of the voice signal. At the same time, due to the audio response characteristics of the mic and high-power SIP horn themselves, the voice signal in certain frequency bands forms a peak, and this peak signal is output by the high-power SIP horn as howling. On the one hand, howling seriously affects the quality of voice communication, and on the other hand, it makes users feel uncomfortable and unable to carry out collaborative maintenance and inspection work normally. Although reducing the mic sensitivity, optimizing the call volume gain of the high-power SIP horn, and adjusting the relative position of the IP phone host and the high-power SIP horn in the same group can reduce the howling phenomenon, the final effect is unsatisfactory. Either the output sound of the high-power SIP horn becomes smaller, and the specific voice content cannot be heard clearly in the alley, which is difficult to meet on-site use needs. Or in a narrow alley, due to space constraints, the relative distance between the IP phone host and the high-power SIP horn in the same group is limited, and the positive feedback of the voice signal cannot be effectively avoided, which still causes howling.

[0004] However, in the prior art, howling suppression methods need to be implemented based on a DSP hardware platform, resulting in the inability of communication equipment that has been mass-produced or in use to implement commonly used howling suppression methods. Adding an additional DSP hardware platform will cause a sharp increase in costs. Summary of the Invention

[0005] The purpose of the present invention is to provide a howling suppression method and device for a multi-point voice communication system, aiming to solve the technical problem that the howling suppression method in the prior art needs to be implemented based on a DSP hardware platform, resulting in the inability of communication equipment that has been mass-produced or in use to implement the commonly used howling suppression method, and adding an additional DSP hardware platform will cause a sharp increase in cost.

[0006] To achieve the above-mentioned purpose, the present invention adopts a howling suppression device for a multi-point voice communication system, including an optical fiber, a communication mechanism and a passive filter module. The number of the communication mechanisms is multiple groups, and each group of the communication mechanisms is respectively connected to the optical fiber communication. The number of the passive filter modules is multiple groups, and each group of the passive filter modules is respectively embedded in the corresponding communication mechanism. Each group of the communication mechanisms includes a communication unit, a SIP horn and a network cable. One end of the network cable is communicatively connected to the communication unit, and the other end of the network cable is communicatively connected to the SIP horn.

[0007] Among them, each group of the communication units includes a communication host box, an IP phone host, an industrial Ethernet switch, a modular guide rail socket, a miniature circuit breaker, a wiring terminal and a sealing strip. The IP phone host is embedded in the interior of the communication host box, the industrial Ethernet switch is embedded in the interior of the communication host box and is located at the lower end of the IP phone host, the modular guide rail socket is embedded in the interior of the industrial Ethernet switch and is located on one side of the industrial Ethernet switch, the miniature circuit breaker is embedded in the interior of the communication host box and is located on one side of the modular guide rail socket, the wiring terminal is embedded in the interior of the communication host box and is located on one side of the miniature circuit breaker, and the number of the sealing strips is multiple groups, and each group of sealing strips is fixedly connected to the communication host box and is located on one side of the communication host box.

[0008] Among them, the IP telephone host includes a host handle, a host base, a voice signal acquisition and processing unit, a first voice signal playback unit, a second voice signal playback unit, a display unit and an information input unit. The voice signal acquisition and processing unit is embedded in the host handle, the first voice signal playback unit is embedded in the host handle, and the second voice signal playback unit is embedded in the host base. The display unit is fixedly connected to the host base and is located at the upper end of the host base. The information input unit is arranged at the upper end of the host base and is adapted to the host base. The lower end of the host base has a network data transmission interface.

[0009] Among them, each group of the passive filter modules includes an input port, a 2×2 fourth-order low-pass filter module, an output port, a high-frequency bypass capacitor, a low-frequency decoupling capacitor and a release resistor. The input port is arranged on one side of the 2×2 fourth-order low-pass filter module, the output port is arranged on one side of the 2×2 fourth-order low-pass filter module, the high-frequency bypass capacitor is embedded in one side of the 2×2 fourth-order low-pass filter module, the low-frequency decoupling capacitor is embedded in one side of the 2×2 fourth-order low-pass filter module, and the release resistor is embedded in one side of the 2×2 fourth-order low-pass filter module.

[0010] The present invention further provides a howling suppression method for a multipoint voice communication system, which is applied to the howling suppression device for the multipoint voice communication system as described above, and comprises the following steps:

[0011] Sampling the ambient noise and voice signals in the mine belt conveyor tunnel as the voice signal to be tested, performing spectrum analysis on the voice signal to be tested using simulation software, and forming a simulation model of the voice signal to be tested, which is used to represent the actual voice signal collected by the MIC of the IP phone host;

[0012] Constructing an acoustic feedback model of the voice communication system using simulation software, using the simulation model of the voice signal to be measured as an excitation condition, the acoustic feedback model as an object, and the output of the acoustic feedback model as a response to simulate the howling phenomenon;

[0013] Performing spectrum analysis on the response in the simulation software to determine the target frequency band containing howling and obtain the frequency of the howling point in the target frequency band;

[0014] The frequency of the howling point in the target frequency band is corrected to obtain a corrected howling frequency; the corrected howling frequency is used as the center frequency corresponding to the filter to be designed, and a corresponding filter is designed to achieve howling suppression.

[0015] The beneficial effects of the howling suppression method and device of a multi-point voice communication system of the present invention are as follows: through system modeling and simulation, the filter design parameters are obtained, the filter is designed and manufactured, and the filter is connected in series between the Mic and the IP telephone host. When the IP telephone host makes a call, the Mic collects environmental noise and voice signals. The collected voice signals are filtered out of related interference signals after passing through the filter module, destroying the conditions for forming positive feedback of the voice signal and avoiding the formation of peaks in the voice signal, thereby achieving howling suppression. After being connected in series with the filter, the stability of the multi-point voice communication system of the mine belt conveyor tunnel and the quality of the voice signal output by the SIP high-power horn can still be guaranteed; the howling phenomenon is effectively suppressed, and at the same time, the stability of the multi-point voice communication system of the mine belt conveyor tunnel and the quality of the voice signal output by the SIP high-power horn are guaranteed to be good and clear; it adopts a modular design, has a simple structure, low cost, is easy to implement, is easy to expand, and has the characteristics of easy use, flexibility, and simple maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0017] Figure 1 The present invention is a schematic structural diagram of a howling suppression device for a multipoint voice communication system.

[0018] Figure 2 It is a structural diagram of the communication mechanism of the present invention.

[0019] Figure 3 It is a schematic diagram of the internal structure of the communication unit of the present invention.

[0020] Figure 4 It is a structural diagram of the IP telephone host of the present invention.

[0021] Figure 5 It is a rear view of the host base of the present invention.

[0022] Figure 6 The present invention is a voice signal transmission system diagram of a howling suppression device for a multipoint voice communication system.

[0023] Figure 7 It is a connection diagram of the passive filter module of the present invention.

[0024] Figure 8 It is a structural schematic diagram of the passive filter module of the present invention.

[0025] Figure 9 The present invention is a flowchart of a method for suppressing howling in a multipoint voice communication system.

[0026] 101-Optical fiber, 102-Communication mechanism, 103-Passive filter module, 104-Communication host chassis, 105-IP phone host, 106-Industrial Ethernet switch, 107-Modular guide rail socket, 108-Miniature circuit breaker, 109-Terminal block, 110-Sealing strip, 111-Host handle, 112-Host base, 113-Voice signal acquisition and processing unit, 114-First voice signal playback unit, 115-Second voice signal playback unit, 116-Display unit, 117-Information input unit, 118-Input port, 119-2×2 fourth-order low-pass filter module, 120-Output port, 121-High-frequency bypass capacitor, 122-Low-frequency decoupling capacitor, 123-Release resistor, 124-Communication unit, 125-SIP horn, 126-Network cable. DETAILED DESCRIPTION

[0027] See also Figures 1 to 8The present invention provides a howling suppression device for a multi-point voice communication system, including an optical fiber 101, a communication mechanism 102 and a passive filter module 103. The number of the communication mechanism 102 is multiple groups, and each group of the communication mechanism 102 is respectively communicatively connected to the optical fiber 101. The number of the passive filter module 103 is multiple groups, and each group of the passive filter module 103 is respectively embedded in the corresponding communication mechanism 102. Each group of the communication mechanism 102 includes a communication unit 124, a SIP horn 125 and a network cable 126. One end of the network cable 126 is communicatively connected to the communication unit 124, and the other end of the network cable 126 is communicatively connected to the SIP horn 125.

[0028] Furthermore, each communication unit 124 includes a communication host box 104, an IP phone host 105, an industrial Ethernet switch 106, a modular guide rail socket 107, a miniature circuit breaker 108, a terminal block 109 and a sealing strip 110. The IP phone host 105 is embedded in the communication host box 104, the industrial Ethernet switch 106 is embedded in the communication host box 104 and is located at the lower end of the IP phone host 105, and the modular guide rail socket 107 is embedded in the industrial Ethernet switch 106. The network switch 106 is inside and located on one side of the industrial Ethernet switch 106. The miniature circuit breaker 108 is embedded in the communication host box 104 and is located on one side of the modular guide rail socket 107. The wiring terminal 109 is embedded in the communication host box 104 and is located on one side of the miniature circuit breaker 108. The number of the sealing strips 110 is multiple groups, and each group of the sealing strips 110 is fixedly connected to the communication host box 104 and is located on one side of the communication host box 104.

[0029] Furthermore, the IP telephone host 105 includes a host handle 111, a host base 112, a voice signal acquisition and processing unit 113, a first voice signal playback unit 114, a second voice signal playback unit 115, a display unit 116 and an information input unit 117. The voice signal acquisition and processing unit 113 is embedded in the host handle 111, the first voice signal playback unit 114 is embedded in the host handle 111, and the second voice signal playback unit 115 is embedded in the host base 112. The display unit 116 is fixedly connected to the host base 112 and is located at the upper end of the host base 112. The information input unit 117 is arranged at the upper end of the host base 112 and is adapted to the host base 112. The lower end of the host base 112 has a network data transmission interface.

[0030] Furthermore, each group of the passive filter module 103 includes an input port 118, a 2×2 fourth-order low-pass filter module 119, an output port 120, a high-frequency bypass capacitor 121, a low-frequency decoupling capacitor 122 and a release resistor 123. The input port 118 is arranged on one side of the 2×2 fourth-order low-pass filter module 119, the output port 120 is arranged on one side of the 2×2 fourth-order low-pass filter module 119, the high-frequency bypass capacitor 121 is embedded in one side of the 2×2 fourth-order low-pass filter module 119, the low-frequency decoupling capacitor 122 is embedded in one side of the 2×2 fourth-order low-pass filter module 119, and the release resistor 123 is embedded in one side of the 2×2 fourth-order low-pass filter module 119.

[0031] See also Figure 9 The present invention also provides a howling suppression method for a multipoint voice communication system, which is applied to the howling suppression device for a multipoint voice communication system as described above, and comprises the following steps:

[0032] S1: Sampling the ambient noise and voice signal in the mine belt conveyor tunnel as the voice signal to be measured, performing spectrum analysis on the voice signal to be measured using simulation software, and forming a simulation model of the voice signal to be measured, which is used to represent the actual voice signal collected by the microphone of the IP phone host 105;

[0033] S2: constructing an acoustic feedback model of the voice communication system using simulation software, using the simulation model of the voice signal to be measured as an excitation condition, the acoustic feedback model as an object, and the output of the acoustic feedback model as a response to simulate the howling phenomenon;

[0034] S3: In the simulation software, perform spectrum analysis on the response, determine the target frequency band containing howling, and obtain the howling point frequency in the target frequency band;

[0035] S4: Correcting the frequency of the howling point in the target frequency band to obtain a corrected howling frequency; using the corrected howling frequency as the center frequency of the filter to be designed, and designing a corresponding filter to achieve howling suppression.

[0036] In this embodiment, the 2×2 fourth-order low-pass filter module 119 has a bandwidth of 20Hz to 20kHz, which does not affect the voice call quality; the input and output impedance is 100Ω, which is compatible with the AC characteristic impedance, the insertion loss is less than 1dB, the line return loss is greater than 18dB, and it has an ultra-low frequency common-mode interference suppression of 88dB@10kHz;

[0037] The high-frequency bypass capacitor 121 is used to filter out high-frequency noise and high-frequency electromagnetic interference signals; the 2×2 fourth-order low-pass filter module 119 adopts a high-resistance potting process to achieve howling suppression; the low-frequency decoupling capacitor 122 is used to filter out low-frequency noise; the bleeder resistor is used to eliminate self-oscillation; the input port 118 and the output port 120 are both RJ11 ports, the input port 118 is connected to the host handle 111 through a handle curve, and the output port 120 is connected to the host base 112 through a handle curve; through system modeling and simulation, the filter design parameters are obtained, the filter is designed and manufactured, and the filter is connected in series between the Mic and the IP phone host 105, the IP phone When the host 105 calls, the Mic collects environmental noise and voice signals. The collected voice signals are filtered out of related interference signals after passing through the filter module, destroying the conditions for forming positive feedback of the voice signal and avoiding the formation of peaks in the voice signal, thereby achieving howling suppression. After being connected in series with the filter, the stability of the multi-point voice communication system in the mine belt conveyor tunnel and the quality of the voice signal output by the SIP high-power horn can still be guaranteed; the howling phenomenon is effectively suppressed, while ensuring the stability of the multi-point voice communication system in the mine belt conveyor tunnel and the good and clear quality of the voice signal output by the SIP high-power horn; modular design is adopted, with simple structure, low cost, easy implementation, easy expansion, and the characteristics of easy use, flexibility and simple maintenance.

[0038] The above disclosure is only a preferred embodiment of the present invention, and certainly cannot be used to limit the scope of the rights of the present invention. Ordinary technicians in this field can understand that all or part of the processes of the above embodiment and equivalent changes made in accordance with the claims of the present invention are still within the scope of the invention.

Claims

1. A howling suppression device for a multipoint voice communication system, characterized in that: It includes optical fibers, communication mechanisms and passive filter modules. There are multiple groups of communication mechanisms, and each group of communication mechanisms is respectively connected to the optical fibers for communication. There are multiple groups of passive filter modules, and each group of passive filter modules is respectively embedded in the corresponding communication mechanisms. Each group of communication mechanisms includes a communication unit, a SIP horn and a network cable. One end of the network cable is connected to the communication unit for communication, and the other end of the network cable is connected to the SIP horn for communication.

2. The howling suppression device for a multipoint voice communication system according to claim 1, wherein: Each group of the communication units includes a communication host box, an IP phone host, an industrial Ethernet switch, a modular guide rail socket, a miniature circuit breaker, a wiring terminal and a sealing strip. The IP phone host is embedded in the interior of the communication host box, the industrial Ethernet switch is embedded in the interior of the communication host box and is located at the lower end of the IP phone host, the modular guide rail socket is embedded in the interior of the industrial Ethernet switch and is located on one side of the industrial Ethernet switch, the miniature circuit breaker is embedded in the interior of the communication host box and is located on one side of the modular guide rail socket, the wiring terminal is embedded in the interior of the communication host box and is located on one side of the miniature circuit breaker, and there are multiple groups of sealing strips, each group of sealing strips is fixedly connected to the communication host box and is located on one side of the communication host box.

3. The howling suppression device for a multipoint voice communication system according to claim 2, wherein: The IP telephone host includes a host handle, a host base, a voice signal acquisition and processing unit, a first voice signal playback unit, a second voice signal playback unit, a display unit and an information input unit. The voice signal acquisition and processing unit is embedded in the host handle, the first voice signal playback unit is embedded in the host handle, and the second voice signal playback unit is embedded in the host base. The display unit is fixedly connected to the host base and is located at the upper end of the host base. The information input unit is arranged at the upper end of the host base and is adapted to the host base. The lower end of the host base has a network data transmission interface.

4. The howling suppression device for a multipoint voice communication system according to claim 1, wherein: Each group of the passive filter modules includes an input port, a 2×2 fourth-order low-pass filter module, an output port, a high-frequency bypass capacitor, a low-frequency decoupling capacitor and a release resistor. The input port is arranged on one side of the 2×2 fourth-order low-pass filter module, the output port is arranged on one side of the 2×2 fourth-order low-pass filter module, the high-frequency bypass capacitor is embedded in one side of the 2×2 fourth-order low-pass filter module, the low-frequency decoupling capacitor is embedded in one side of the 2×2 fourth-order low-pass filter module, and the release resistor is embedded in one side of the 2×2 fourth-order low-pass filter module.

5. A howling suppression method for a multipoint voice communication system, applied to the howling suppression device for a multipoint voice communication system as claimed in claim 1, characterized in that: The steps include: Sampling the ambient noise and voice signals in the mine belt conveyor tunnel as the voice signal to be tested, performing spectrum analysis on the voice signal to be tested using simulation software, and forming a simulation model of the voice signal to be tested, which is used to represent the actual voice signal collected by the MIC of the IP phone host; Constructing an acoustic feedback model of the voice communication system using simulation software, using the simulation model of the voice signal to be measured as an excitation condition, the acoustic feedback model as an object, and the output of the acoustic feedback model as a response to simulate the howling phenomenon; Performing spectrum analysis on the response in the simulation software to determine the target frequency band containing howling and obtain the frequency of the howling point in the target frequency band; The frequency of the howling point in the target frequency band is corrected to obtain a corrected howling frequency; the corrected howling frequency is used as the center frequency corresponding to the filter to be designed, and a corresponding filter is designed to achieve howling suppression.

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