CN116916216A - Noise reduction communication equipment - Google Patents
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/10—Earpieces; Attachments therefor ; Earphones; Monophonic headphones
- H04R1/1083—Reduction of ambient noise
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/08—Mouthpieces; Microphones; Attachments therefor
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R3/00—Circuits for transducers, loudspeakers or microphones
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2201/00—Details of transducers, loudspeakers or microphones covered by H04R1/00 but not provided for in any of its subgroups
- H04R2201/10—Details of earpieces, attachments therefor, earphones or monophonic headphones covered by H04R1/10 but not provided for in any of its subgroups
- H04R2201/105—Manufacture of mono- or stereophonic headphone components
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2410/00—Microphones
- H04R2410/01—Noise reduction using microphones having different directional characteristics
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- Engineering & Computer Science (AREA)
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Abstract
The application discloses noise reduction communication equipment, which comprises a head beam and an earmuff cavity, wherein a conversation microphone, an ambient sound microphone, a front feedback microphone, a rear feedback microphone and a bone conduction microphone are arranged on the earmuff cavity; the front feedback microphone and the rear feedback microphone are connected with the first processing chip so as to realize noise reduction processing on the collected environmental sound; the environmental sound microphone is connected with the second processing chip to realize dynamic compression processing on the collected environmental sound; the conversation microphone and the bone conduction microphone are connected with the third processing chip so as to process collected human voice and environmental sound as well as human voice transmitted from the jawbone; the sound data after the processing is mixed and then is received and transmitted by a wireless radio frequency receiving and transmitting module; the noise reduction communication equipment realizes the comprehensive protection of high, medium and low frequency noise; the effect of reducing the noise of communication voice is realized by adding the bone conduction microphone, the safety of ears is further protected by enhancing the environmental sound, and one-to-many and many-to-many voice communication is realized.
Description
Technical Field
The application relates to the technical field of communication equipment, in particular to noise reduction communication equipment.
Background
At present, air force aviation soldier crews, ship engine cabins, armored cabin workers and the like often carry out maintenance and repair work and the like in the starting state of an airplane or a ship, but due to long-term exposure to high-noise severe environments, the personnel often produce noise deafness, so that daily life is affected, and more serious people can suffer from deafness and disability. At present, most of communication modes of workers in a high noise environment are sign language communication, task communication is carried out through sign language, voice communication cannot be carried out, and effective expression is often not carried out in time when special conditions occur.
At present, some solutions exist for the problem of how to protect the hearing of staff and enable them to communicate in time and efficiently in a high-noise environment:
1) The passive noise reduction technology is that external noise is isolated from ears by utilizing physical characteristics, and is mainly realized by tightly designing a head beam of an earmuff, carrying out acoustic optimization on a cavity of the earmuff, putting sound absorption materials in the earmuff and the like, so that the physical sound insulation of the earphone is realized, and the passive noise reduction is very effective in isolating medium-high frequency sound. The passive noise reduction technology has certain requirements on the clamping force of the earmuffs, and if gaps exist between the earmuffs with small clamping force and the ears, the noise reduction effect is poor, and if the earmuffs are worn for a long time, discomfort and oppression are caused; in addition, the passive noise reduction has a common effect on low-frequency noise of 20Hz-300Hz, the peak value of the low frequency can be reduced by about 6dB at most, and all external sounds are shielded except for some low frequencies while the noise is reduced.
2) Noise reduction headphones such as Hua Cheng, OPPO and millet, which employ a double-microphone Hybrid active noise reduction scheme (Hybrid ANC), typically have 2 noise reduction microphones, one of which is placed in the interior cavity of the headphone, closest to the ear, called feedback microphone (FB), and this feedback noise reduction feature is better low-frequency noise reduction but insufficient width, up to 600Hz noise reduction; the other microphone is placed in the external cavity of the earphone, the noise reduction is wider, 1K-2.5KHz can be achieved, so that the advantages of a feedforward type and a feedback type are combined by the mixed noise reduction, the feedback type low-frequency noise reduction is combined with the feedforward type noise reduction width, the deepest part can reach-45 dB generally, the noise reduction width can reach 1.5KHz-2.5KHz, the noise reduction earphone can be used for better reducing low frequency and intermediate frequency, and the rest high frequency can be isolated by being driven.
3) For example, 3M company and holmivir electronic imitation ear muffs adopt an environmental sound enhancement technology, namely, small sounds around the environment are amplified such as rain sounds and slight footstep sounds, and large burst noise and continuous large noise are dynamically compressed, so that the external environmental sounds are heard, and the hearing of people in the large noise environment is protected. Most of the environmental sounds are isolated due to passive noise reduction, so that the perception capability of surrounding environmental sounds is reduced, corresponding judgment and response cannot be accurately and timely made, accidents caused by wearing headphones are frequent in reality, and the protective ear muffs can protect ears under high noise, but also bring danger to people. Therefore, by adding the environment enhancement technology, the communication equipment is more practical and meets the practical application of some specific scenes.
4) Bone conduction noise reduction technology, also called uplink noise reduction, mainly speaking by oneself to make the other party clearly audible, and the bone conduction noise reduction technology is that an electric signal converted from slight vibration of bone through bone conduction is additionally arranged in an ear muff besides a 'talking microphone' for receiving voice signals. The former is to receive airborne speech and the latter is to receive slightly vibration-propagated speech of the bone. Airborne speech is subject to noise interference, such as the usual wind noise, when the external ambient noise is relatively large, and the speech bone conduction technique is to convert the slight vibration of the bone when the speech has been made into an electrical signal, whereas the external ambient noise cannot be converted into an electrical signal because of no vibration, so that only the self-contained speech signal is transmitted to the counterpart, which is not affected by the external environment.
However, the prior art solutions still have some problems requiring further optimization improvements, such as: in the aspect of communication technology, generally 433 megabytes and 915 megabytes interphone (or vehicle-mounted communication equipment or amateur communication equipment) products are low-frequency narrowband communication technology, the working frequency range of the low-frequency narrowband communication technology is very narrow and is 5-25KHz, the safety and confidentiality of a communication system are poor, single-frequency point operation is adopted, the communication is unreliable due to the fact that multipath effects caused by shielding cannot be effectively resisted, the system is unstable, channels are very crowded, the environmental interference is very large, and therefore the environmental interference is very large; in addition, the power consumption is large, the size of the transmitter and the antenna is large, and the health of people can be influenced when the transmitter and the antenna are used in a large amount. In the aspect of communication technology among a plurality of wireless earphones, the existing earphone, earplug and protective earmuff can only carry out noise protection of a single person and mutual transmission of audio frequency models among equipment such as a computer, a mobile phone and the like, voice conversation can only be realized by connecting the mobile phone through Bluetooth, one-to-one, one-to-many and many-to-many direct intercommunication are not realized.
Accordingly, there is an urgent need to develop a noise reduction communication device to efficiently solve one or more of the above-mentioned problems.
Disclosure of Invention
It is an object of the present application to provide a new solution for a noise reducing communication device.
The application provides noise reduction communication equipment, which comprises a head beam and earmuff cavities arranged on two sides of the head beam, wherein a conversation microphone, an ambient sound microphone and a front feedback microphone are arranged on the outer side of the earmuff cavity, and a rear feedback microphone and a bone conduction microphone are arranged on the inner side of the earmuff cavity; the front feedback microphone and the rear feedback microphone are connected with the first processing chip, and the ambient sound microphone is connected with the second processing chip; the conversation microphone and the bone conduction microphone are connected with the third processing chip;
the first processing chip is used for carrying out noise reduction processing on the environmental sound collected by the front feedback microphone and the rear feedback microphone so as to obtain environmental sound data after low-frequency noise is eliminated; the second processing chip is used for dynamically compressing the environmental sound collected by the environmental sound microphone to obtain compressed environmental sound data; the third processing chip is used for processing the voice and the environmental sound collected by the conversation microphone and the voice transmitted by the jawbone collected by the bone conduction microphone so as to obtain clear voice data; the environment sound data after eliminating the low-frequency noise, the environment sound data after compressing and processing and the clear voice data are transmitted and received through the wireless radio frequency transceiver module after being subjected to sound mixing processing.
Optionally, the device further comprises a codec chip, the call microphone and the bone conduction microphone are connected with the third processing chip through the codec chip, and the codec chip is used for converting collected human voice, environment voice and human voice transmitted from jawbone into digital signals.
Optionally, the wireless signal received by the wireless radio frequency transceiver module is transmitted to the codec chip for decoding processing after passing through the third processing chip, so as to output analog voice.
Optionally, the wireless radio frequency transceiver module includes an antenna, a power amplifier and a wireless radio frequency transceiver chip that are connected, and the radio frequency range of the wireless radio frequency transceiver chip is 2.4GHz frequency band.
Optionally, a voice extraction algorithm based on a deep neural network is built in the third processing chip, the voice extraction algorithm based on the deep neural network can efficiently fuse microphone signals and bone vibration signals, human voice and noise are separated in real time, meanwhile, calcaneus vibration signals are compared, and human voice definition data reduction processing is performed.
Optionally, the device further comprises a main control chip connected with the second processing chip, wherein the main control chip is connected with the second processing chip through I 2 And C, initializing the second processing chip by an interface and controlling the on/off of the environmental sound of the second processing chip by writing a control command.
Optionally, the first processing chip adopts a fully-integrated adaptive active noise reduction chip with a model of BES2300 YP.
Optionally, the ear muff cavity is loudspeaker form, reserve tuning hole and pressure release hole on the ear muff cavity.
Optionally, the device further includes a charging power management module connected to the main control chip, where the charging power management module is connected to an external power supply through a Type-C interface.
Optionally, the charging power management module includes a charging chip and a charging protection chip that are connected, the model of the charging chip may be SY6101, and the model of the charging protection chip may be SY5320.
According to one embodiment of the present disclosure, the following beneficial effects are provided:
the noise reduction communication equipment actively and jointly reduces noise by combining the structural airtight design with the noise reduction chip, so that the comprehensive protection of high, medium and low frequency noise is realized, and the definition of voice communication signals is ensured; by adding the bone conduction microphone, when wireless voice intercom is realized in a high-noise environment, the counterpart only hears human voice and does not have environmental sound, so that the effect of noise reduction of communication voice is achieved; the environmental sound enhancement technology is adopted in the aspect of picking up the necessary environmental sound, so that the safety of ears of people is further protected; and the voice communication between the one-to-many and many-to-many communication devices is realized by the wireless radio frequency communication technology.
Other features of the present application and its advantages will become apparent from the following detailed description of exemplary embodiments of the application, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description, serve to explain the principles of the application.
Fig. 1 is a schematic diagram of an outline structure of a noise reduction communication device according to an embodiment;
fig. 2 is a schematic diagram of the outline structure of a head beam in a noise reduction communication device according to an embodiment;
fig. 3 is a schematic diagram showing the outline structure of an ear muff cavity in a noise reduction communication device according to an embodiment;
fig. 4 is a schematic diagram showing the external configuration of an ear muff cavity in a noise reduction communication device according to the second embodiment;
fig. 5 is a schematic circuit diagram of a noise reduction communication device according to an embodiment;
fig. 6 is a schematic diagram of a sound signal link of a noise reduction communication device according to an embodiment;
fig. 7 is a schematic circuit diagram of wireless communication in a noise reduction communication device according to an embodiment.
Reference numerals illustrate:
a head beam 1;
a headgear assembly 11; a head bow assembly 12; an ear-hook assembly 13;
an earmuff cavity 2;
an ear cup assembly 21; a cavity assembly 22; a separate chamber 221; a vent hole 222; feedforward microphone holes 23; an ambient sound hole 24; feedback microphone 223; a rotating assembly 25; a key assembly 26; a miaow bar assembly 27; an antenna assembly 28.
Detailed Description
Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present application unless it is specifically stated otherwise.
The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the application, its application, or uses.
Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but are intended to be part of the specification where appropriate.
In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of exemplary embodiments may have different values.
Referring to fig. 1-7, an embodiment of the present application provides a noise reduction communication device, which includes a head beam 1 and ear muff cavities 2 disposed on two sides of the head beam 1, wherein a conversation microphone, an ambient sound microphone 3 and a front feedback microphone 4 are disposed on the outer side of the ear muff cavities 2, and a back feedback microphone 5 and a bone conduction microphone are disposed on the inner side of the ear muff cavities 2; the front feedback microphone 4 and the rear feedback microphone 5 are connected with the first processing chip U3, and the ambient sound microphone 3 is connected with the second processing chip U1; the conversation microphone and the bone conduction microphone are connected with the third processing chip U6;
the first processing chip U3 is used for performing noise reduction processing on the environmental sound collected by the front feedback microphone 4 and the rear feedback microphone 5 so as to obtain environmental sound data after low-frequency noise is eliminated; the second processing chip U1 is used for dynamically compressing the environmental sound collected by the environmental sound microphone 3 to obtain compressed environmental sound data; the third processing chip U6 is used for processing the human voice and the environmental sound collected by the communication microphone and the human voice transmitted by the jawbone collected by the bone conduction microphone so as to obtain clear human voice data; the environment sound data after eliminating the low-frequency noise, the environment sound data after compressing and processing and the clear voice data are transmitted and received through the wireless radio frequency transceiver module after being subjected to sound mixing processing.
It should be noted that, in this embodiment, the first processing chip, the second processing chip and the third processing chip are all DSP chips (Digital Signal Processing digital signal processing), which may be DSP chips of different types or DSP chips of the same type.
Optionally, the noise reduction communication device according to the embodiment of the present application further includes a codec chip U5, where the call microphone and the bone conduction microphone are connected to the third processing chip U6, and the codec chip U5 is configured to convert collected human voice, ambient sound, and human voice transmitted from the jawbone into digital signals.
For example, the third processing chip in this embodiment may be an ADAU1761 chip, which is a low-power-consumption stereo audio codec with integrated digital audio processing function, supports stereo 48kHz recording and playback, and uses a 1.8V analog power supply to supply power, with power consumption of 14mW; stereo audio ADCs and DACs support sampling rates in the range of 8kHz to 96kHz and digital volume control. The SigmaDSP cube core has 28-bit processing characteristics (56-bit double precision). The system designer can make up for the practical limitations of microphone, loudspeaker, power amplifier and listening environment by using the processor through equalization, multi-band compression, amplitude limiting and third-party algorithm, thereby obviously improving tone quality experience. ADAU1761 can be programmed with a SigmaStudio ™ graphic development tool. The software contains audio processing modules such as a filter, a dynamic processor, a mixer, a low-level DSP function and the like, and can rapidly develop a custom signal flow. The recording path includes an integrated microphone bias circuit and six inputs. These inputs may be mixed and multiplexed prior to the ADC or may be configured to bypass the ADC. ADAU1761 contains one-way stereo digital microphone input. The ADAU1761 incorporates five high power output drivers (two differential, three single ended) that support stereo headphones, earphones, or other output transducers. The device also supports ac coupling or a capacitance-free configuration. All analog outputs support independent precision level control. The output mixer stage allows flexible routing of audio.
Optionally, in the noise reduction communication device according to the embodiment of the present application, a wireless signal received by the wireless radio frequency transceiver module is transmitted to the codec chip U5 for decoding after passing through the third processing chip U6, so as to output an analog voice.
Optionally, the wireless radio frequency transceiver module in the noise reduction communication device according to the embodiment of the present application includes an antenna E1, a power amplifier U8 and a wireless radio frequency transceiver chip U7 that are connected, where a radio frequency range of the wireless radio frequency transceiver chip U7 is 2.4 GHz.
As shown in fig. 7, in this embodiment, the bone conduction voice communication adopts the 2.4G wireless intercom technology to realize a clear dialogue between multiple sets of noise reduction devices. Compared with 433 megapairs and 915 megapairs of the machine, the machine has the advantages of strong interference resistance, strong confidentiality and security, stable communication quality and difficult cracking.
FIG. 6 is a schematic diagram of an audio link of the entire noise reduction communication device, where a speech signal collected by a call microphone (i.e., a call microphone) and a bone conduction microphone (i.e., a bone conduction microphone) and a signal vibrated during speech (i.e., an uplink speech) are encoded by an encoder and then converted into digital signals, the encoded digital uplink speech signals are input into a DSP by an I2S mode for algorithm processing, and the processed uplink digital speech signals are transmitted to a radio frequency IC chip by an SPI mode and finally transmitted by radio frequency signals; the aerial wireless radio frequency signal is received through the antenna, is converted into a digital signal (also called as downlink digital voice) through the wireless receiving and transmitting radio frequency IC chip, the digital signal is transmitted to the DSP for processing through the SPI mode, the processed downlink digital signal is transmitted to the decoder for decoding through the I2S mode, the decoded voice signal and the ambient sounds on two sides are mixed, the mixed voice signal of the left ambient sound and the downlink voice is input into the ANC noise reduction chip and then is mixed with the ANC noise reduction signal fed back by the left front feedback microphone, the mixed voice signal of the right ambient sound and the downlink voice is input into the ANC noise reduction chip and then is mixed with the ANC noise reduction signal fed back by the right front feedback microphone, in the process of mixing, the downlink voice can be respectively mixed with the ambient sound or the noise reduction signal through the program control, and finally the mixed voice signal with the downlink voice signal is input into the power amplifier for amplifying and pushing the loudspeaker.
Optionally, in the noise reduction communication device according to the embodiment of the present application, a voice extraction algorithm based on a deep neural network is built in the third processing chip U6, and the voice extraction algorithm based on the deep neural network can efficiently fuse a microphone signal and a bone vibration signal, separate human voice and noise in real time, and perform human voice definition data restoration processing by comparing calcaneus vibration signals.
Optionally, the noise reduction communication device according to the embodiment of the present application further includes a main control chip U2 connected to the second processing chip U1, where the main control chip U2 passes through the I 2 The C interface initializes the second processing chip U1 and controls on/off of the ambient sound of the second processing chip U1 by writing a control command.
Optionally, in the noise reduction communication device according to the embodiment of the present application, the first processing chip U3 is a fully-integrated adaptive active noise reduction chip with a model of BES2300 YP.
In the embodiment, BES2300YP is a fully integrated self-adaptive active noise reduction chip, cortex M4F dual cores are built in, and a 28nm HKMG CMOS technology and BGA packaging are used; the method supports fourth-generation active noise reduction Hybid mixing and environmental sound monitoring, adopts a fourth-generation double-microphone call noise reduction algorithm, is compatible with Google, amazon, alibaba, tencent, baidu multiple intelligent voice assistants, and can select multiple audio coding technologies of AAC/SBC/LDAC/UHQ/LHDC/HWA.
Optionally, in the noise reduction communication device according to the embodiment of the present application, the ear muff cavity 2 is horn-shaped, and tuning holes and pressure release holes are reserved on the ear muff cavity 2. In this embodiment, the ear muff cavity in the noise reduction communication device adopts a horn-shaped independent cavity, and in order to increase the isolation between the front cavity and the rear cavity, a tuning hole and a pressure release hole (the pressure release hole can be arranged on the front cavity panel) are reserved in the horn cavity. It should be noted that, the design of the horn-shaped independent cavity in this embodiment, the structural design of the internal acoustic cavity and the channel adopting the tightness should satisfy the acoustic design factors to achieve the reliable connection tightness.
Referring to fig. 3-4, the ear muff cavity 2 in this embodiment comprises three parts, namely a rear part, a middle part and a front part, wherein the rear part mainly comprises the ear muff assembly 21, the middle part mainly comprises the cavity assembly 22 comprising the independent cavity 221 and the air leakage hole 222, the front part mainly comprises the feedforward microphone hole 23 and the environmental sound microphone hole 24, and the middle part cavity assembly 22 further comprises the feedback microphone hole 223.
In addition, in the embodiment, when the head beam is selected, the head beam structure with the metal screw cannot appear in the structure, because the metal screw is likely to fall off and fall into an overhauled airplane after being worn for a long time, unpredictable results are generated; and the clamping force of the headset directly influences the comfort under the stress condition when the user wears, and the A20 head beam of the BOSS brand is consulted, so that the headset is stable and mature in structure and comfortable to wear.
Referring to fig. 1-2, the head rest 1 of this embodiment includes a headgear assembly 11, a head bow assembly 12, and an ear hook assembly 13. In this embodiment, a rotating component 25 and a key component 26 are further disposed on one side of the ear muff cavity 2, and a microphone rod component 27 and an antenna component 28 are disposed on the other side of the ear muff cavity 2.
Optionally, the noise reduction communication device according to the embodiment of the present application further includes a charging power management module connected to the main control chip U2, where the charging power management module is connected to an external power supply through a Type-C interface.
Optionally, the charging power management module in the noise reduction communication device according to the embodiment of the present application includes a charging chip and a charging protection chip that are connected, where the type of the charging chip may be SY6101, and the type of the charging protection chip may be SY5320.
Referring to fig. 5 and 6, a talking microphone (MIC 5) collects human and environmental sounds, a warp-coded decoder chip U5 converts into digital signals, and a synchronous bone conduction microphone collects sounds from jawboneThe transmitted human voice (frequency point information except 50HZ-700HZ is removed) is also converted into digital signals by the U5 chip of the warp-decoding device, and the two digital signals pass through I 2 S is transmitted to a third processing chip (DSP chip) U6 for comparison, voice definition data reduction processing is carried out, finally, only clear voice data is remained, the data is transmitted to a 2.4G wireless radio frequency transceiver chip U7 in an SPI mode, then, a wireless signal is transmitted through a power amplifier U8, and the transmitted data is generally called uplink data. The downlink data is a wireless signal received by the 2.4G wireless radio frequency transceiver chip U7, and is transmitted to the third processing chip U6 through SPI, and the U6 passes through I 2 S is transmitted to the codec chip U5 for decoding processing, and finally, the downlink analog voice is output.
The ambient sound microphones (MIC 6, MIC 7) collect ambient sound, and the ambient sound is subjected to digital-to-analog conversion processing by the second processing chip U1 and then is mixed with the audio signal (LINE-OUT) output by the wireless audio.
The audio signal processed by the second processing chip U1 is processed by I 2 S is input into a first processing chip U3, noise signals collected by a front feedback microphone and a rear feedback microphone ((L-FF) MIC1, (R-FF) MIC3, (L-FB) MIC2, (R-FB) MIC 4) are processed by the first processing chip U3, and then are mixed with the noise signals to be output, and then the mixed noise signals are output through a power amplifier U4 to drive a loudspeaker.
Specifically, SY6101 is a single lithium battery linear charging chip integrating high voltage input, OVP protection, and constant current/voltage. The chip can bear an input voltage of up to 28V, and in order to prevent excessive power consumption, the charging function is closed after the input voltage is higher than an overvoltage protection threshold value by 6V. Up to 28V input voltage withstand capability, the required input overvoltage protection circuit can be omitted for low voltage chargers. The constant current charge current ICC can be set through an ISET pin external resistor, and can adapt to more application requirements. When the on-cell voltage is below 2.8V, the IC will precharge the cell with a constant current charge current of 10%. SY6101 integrates an anti-reverse charging circuit inside without an external isolation diode. The built-in heat attenuation control function can carry out intelligent regulation to the charging current to promote the reliability of chip. SY6101 has the function of closing the power tube after BAT is full. When BAT voltage is about to be full, when charging current is lower than 10% ICC, charging is cut off; when BAT is below the recharge threshold, recharging is initiated. SY6101 provides the PG and CHG pins as open drain NMOS drive structures for driving the LED indicator lamp, also in combination with the EN pin.
The SY5320 overvoltage and overcurrent protection chip is a high-integration protection chip integrating the characteristics of input undervoltage and overvoltage protection, lithium battery front end overvoltage protection, load current abnormal protection, overtemperature protection and the like, and supports the high-precision battery overvoltage protection function.
In summary, in order to ensure the voice quality during wireless intercom in a high-noise environment, most importantly, in order to enable the opposite party to hear the voice communication signal, the noise reduction communication device according to the embodiment of the application adopts a bone conduction microphone, the bone conduction microphone directly converts the light vibration signal collected from the temporal bone (bone below the temple) when the opposite party has talked into an electric signal, and external environmental noise cannot be converted into an electric signal because of no vibration, so that the opposite party only hears human voice and does not have environmental voice during wireless intercom in a high-noise environment, and the effect of noise reduction of communication voice is achieved.
In order to enable the opposite voice signal to be heard in the high-noise environment, the noise-reducing communication equipment adopts active and passive noise reduction to eliminate noise in the environment, adopts the sealing property of the structure to eliminate medium and high frequency to achieve the noise reduction effect of more than 25dB, adopts a DSP noise reduction chip to achieve the low-frequency elimination, adopts a Hybrid ANC mode to realize the Hybrid active noise reduction, utilizes various digital filters on the digital DSP chip to construct reverse sound waves to counteract noise, and continuously optimizes and adjusts the digital filters in the DSP to achieve the optimal reverse sound waves, wherein a front feedback microphone (FF) collects outside environment noise and sends out reverse sound wave cancellation through a loudspeaker, and a rear feedback microphone (FB) detects residual noise in an auditory canal and sends out sound wave cancellation through the loudspeaker. The noise cancellation mode effectively ensures the width and depth of noise reduction. The initiative adopted by the embodiment is combined to reduce noise, so that the comprehensive protection of high, medium and low frequency noise is realized, and the guarantee is provided for the definition degree of the voice communication signal.
The noise reduction communication equipment of the embodiment of the application adopts an environmental sound enhancement technology in the aspect of picking up the necessary environmental sound, an environmental sound microphone with a microphone hole facing outwards is added at the outer side of the earmuff cavity, the external sound is collected and is processed through a DSP chip, a dynamic compression algorithm is built in the DSP chip, when the input environmental sound signal is not very large, the signal is output according to the original mode, but when the input signal is too large, the compression algorithm compresses the amplitude of the output signal to limit the amplitude of the output signal to be within an acceptable range of human ears, and when the external has burst large noise, such as gun sound, thunder can be dynamically compressed to be within an acceptable range of human ears.
In order to realize the synchronous voice communication of multiple persons, the noise reduction communication equipment adopts a wireless communication technology, a 2.4G wireless radio frequency transceiver chip is arranged in the earmuff, and signals are received and transmitted through a wireless radio frequency front-end power amplifier chip, so that the voice communication among the one-to-many and many communication equipment is realized.
Note that the technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be regarded as the scope of the description. The foregoing examples illustrate only a few embodiments of the application, which are described in detail and are not to be construed as limiting the scope of the application. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application. Accordingly, the scope of protection of the present application is to be determined by the appended claims.
The foregoing description of the preferred embodiments of the application is not intended to be limiting, but rather to enable any modification, equivalent replacement, improvement or the like to be made within the spirit and principles of the application.
While certain specific embodiments of the application have been described in detail by way of example, it will be appreciated by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the application. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the application. The scope of the application is defined by the appended claims.
Claims (10)
1. The noise reduction communication equipment is characterized by comprising a head beam and earmuff cavities arranged on two sides of the head beam, wherein a conversation microphone, an ambient sound microphone and a front feedback microphone are arranged on the outer side of the earmuff cavity, and a rear feedback microphone and a bone conduction microphone are arranged on the inner side of the earmuff cavity; the front feedback microphone and the rear feedback microphone are connected with the first processing chip, and the ambient sound microphone is connected with the second processing chip; the conversation microphone and the bone conduction microphone are connected with the third processing chip;
the first processing chip is used for carrying out noise reduction processing on the environmental sound collected by the front feedback microphone and the rear feedback microphone so as to obtain environmental sound data after low-frequency noise is eliminated; the second processing chip is used for dynamically compressing the environmental sound collected by the environmental sound microphone to obtain compressed environmental sound data; the third processing chip is used for processing the voice and the environmental sound collected by the conversation microphone and the voice transmitted by the jawbone collected by the bone conduction microphone so as to obtain clear voice data; the environment sound data after eliminating the low-frequency noise, the environment sound data after compressing and processing and the clear voice data are transmitted and received through the wireless radio frequency transceiver module after being subjected to sound mixing processing.
2. The noise reduction communication device according to claim 1, further comprising a codec chip, wherein the conversation microphone and the bone conduction microphone are connected to the third processing chip via the codec chip, and wherein the codec chip is configured to convert collected human voice, ambient sound, and human voice transmitted from a jawbone into digital signals.
3. The noise reduction communication device according to claim 2, wherein the wireless signal received by the wireless radio frequency transceiver module is transmitted to the codec chip for decoding processing after passing through the third processing chip, so as to output analog voice.
4. The noise reduction communication device according to claim 1, wherein the radio frequency transceiver module comprises an antenna, a power amplifier and a radio frequency transceiver chip connected to each other, and the radio frequency range of the radio frequency transceiver chip is 2.4 GHz.
5. The noise reduction communication device according to claim 1, wherein the third processing chip is internally provided with a voice extraction algorithm based on a deep neural network, and the voice extraction algorithm based on the deep neural network can efficiently fuse microphone signals and bone vibration signals, separate human voice and noise in real time, and compare calcaneus vibration signals at the same time, so as to perform human voice definition data reduction processing.
6. The noise reduction communication device of claim 1, further comprising a master control chip coupled to the second processing chip, the master control chip being configured to communicate with the second processing chip via I 2 And C, initializing the second processing chip by an interface and controlling the on/off of the environmental sound of the second processing chip by writing a control command.
7. The noise reduction communication device of claim 1, wherein the first processing chip employs a fully integrated adaptive active noise reduction chip model BES2300 YP.
8. The noise reduction communication device according to claim 1, wherein the ear muff cavity is horn-shaped, and a tuning hole and a pressure release hole are reserved in the ear muff cavity.
9. The noise reduction communication device of claim 6, further comprising a charging power management module connected to the main control chip, the charging power management module being connected to an external power supply through a Type-C interface.
10. The noise reduction communication device of claim 9, wherein the charging power management module comprises a charging chip and a charging protection chip connected, the charging chip may be of a model SY6101, and the charging protection chip may be of a model SY5320.
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