CN208739372U - A kind of electrophone - Google Patents
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- CN208739372U CN208739372U CN201821592813.4U CN201821592813U CN208739372U CN 208739372 U CN208739372 U CN 208739372U CN 201821592813 U CN201821592813 U CN 201821592813U CN 208739372 U CN208739372 U CN 208739372U
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Abstract
A kind of electrophone send words hose including left ear receiver, auris dextra receiver, with what left ear or auris dextra receiver were connect, further includes: the first telecommunication unit of the first audio of acquisition；Acquire the second telecommunication unit of the second audio；Distinguish the separator of the noise signal and local called audio in the second audio；The filter that noise signal is filtered；The signal processor of amplitude and frequency adjustment is carried out to local called audio；The gain unit of gain control processing is carried out to noise signal；Mixer is used for: the noise signal for completing filtering processing and the called audio in local for completing amplitude and frequency adjustment being carried out stereo process, obtain the called audio of output to receiver.The utility model embodiment improves the communication quality of electrophone.
Description
Technical Field
This document relates to, but is not limited to, noise reduction techniques, and more particularly to a handset.
Background
Military noise has complex sound field conditions, and interference of environmental noise on a voice communication system can cause errors or incompleteness of instruction transmission, influence voice information communication between operating personnel on an operation site, and have non-negligible influence on battle deployment and information interaction.
In the related art, the handset mainly includes: a handlebar-style handset, a headset (for use in an open combat area), or a carrier communication cap (for use in a closed armored vehicle passenger compartment); fig. 1 is a schematic view of a prior art headset, fig. 2 is a schematic view of a prior art carrier communications cap, and in the headset of fig. 1 and the carrier communications cap of fig. 2, the microphone is formed by an audio acquisition device connected by a microphone hose; according to the distribution of ears, the telephone receiver mainly comprises a left ear telephone receiver and a right ear telephone receiver; the microphone mostly adopts a moving-coil microphone, the collected voice is not high in definition, the loss of a low-frequency part is large, the playing identification degree of the voice is not high after the voice is restored, and particularly, the communication quality is greatly reduced in the environment with severe environmental noise; some microphones adopt a capacitor microphone, the audio amplitude-frequency characteristic is good, but environmental noise and voice are collected together, the collected voice signal-to-noise ratio is poor when the environmental noise is large, the recognition degree of the voice is not high after the voice is restored, and the communication quality is greatly influenced; in addition, the handset generally adopts a physical sound insulation mode, so that the environmental noise during receiving is reduced, the contribution amount of the physical sound insulation mode to sound insulation is different along with the different densities of sound insulation materials, generally, the sound insulation amount of the handset can be 15 decibels (dB) to 20dB, and the sound insulation amount of the handset with a better sound insulation material is about 25 dB; for ambient noise above 110dB, the noise still cannot be effectively eliminated or suppressed, and the communication quality is seriously affected. In addition, when an operator wears the conventional handset, the operator can communicate with other operators only by a transmitter-receiver method, cannot communicate with an operator who does not wear the handset, and cannot well sense the ambient sound.
In voice communication, how to reduce environmental noise, improve the communication quality of a handset and protect the hearing of an operator is an important problem to be solved at present.
SUMMERY OF THE UTILITY MODEL
The following is a summary of the subject matter described in detail herein. This summary is not intended to limit the scope of the claims.
The embodiment of the utility model provides a electrophone can promote the communication quality of electrophone.
The embodiment of the utility model provides a transmitter and receiver, including left ear receiver, right ear receiver, pass through the transmitting hose of first end connection with left ear receiver or right ear receiver, still include:
a first transmitting unit, a second transmitting unit, a separator, a filter, a gain unit, a signal processor and a mixer; wherein,
the first microphone unit comprises a directional condenser microphone and is used for collecting first audio;
the second transmitting unit comprises an omnidirectional capacitor microphone and is used for acquiring second audio;
the separator is used for: distinguishing and identifying a noise signal in the second audio and a local incoming audio;
the filter is used for: filtering the noise signal according to the amplitude and the frequency of the noise signal;
the gain unit is used for: performing gain control processing on the noise signal;
the signal processor is configured to: adjusting the amplitude and frequency of the local receiving audio obtained by the separator;
the mixer is used for: and carrying out sound mixing processing on the noise signal subjected to filtering processing and the local receiving audio subjected to amplitude and frequency adjustment to obtain receiving audio output to a receiver.
Optionally, the handset further comprises a noise reduction circuit and a correlator; wherein,
the noise reduction circuit is to: determining a noise signal in the environment according to a second audio collected by a second transmitting unit, and performing noise reduction processing on the played communication receiving audio from other transmitters and receivers according to the determined noise signal;
the correlator is used for: and performing correlation processing on the first audio acquired by the first voice transmission unit according to the second audio acquired by the second voice transmission unit to obtain the voice transmission audio subjected to noise reduction.
Optionally, the mixer is further connected to an output end of the noise reduction circuit, and configured to:
and mixing the communication receiving audio subjected to the noise reduction processing and the receiving audio output to a receiver.
Optionally, the directional condenser microphone is disposed at the second end of the microphone hose.
Optionally, the number of the omnidirectional condenser microphones included in the second microphone unit is one or two.
Optionally, the omnidirectional condenser microphone includes a first omnidirectional condenser microphone and a second omnidirectional condenser microphone, and the first omnidirectional condenser microphone and the second omnidirectional condenser microphone are respectively disposed on the first receiver and the second receiver in a symmetrical manner;
wherein, the first receiver is a left-ear receiver or a right-ear receiver; the second receiver is another receiver of the headset except the first receiver.
Optionally, when the first end of the microphone is disposed on the first receiver, the first omnidirectional condenser microphone is disposed in the first end region of the microphone;
when the first end of the microphone is disposed at the second receiver, the second omnidirectional condenser microphone is disposed at the first end region of the microphone.
Optionally, when only one omnidirectional condenser microphone is located in the second microphone unit, the omnidirectional condenser microphone is disposed on the first receiver or the second receiver;
wherein, the first receiver is a left-ear receiver or a right-ear receiver; the second receiver is another receiver of the headset except the first receiver.
Optionally, when the first end of the microphone is disposed on the first receiver, the omnidirectional condenser microphone is disposed in the first end region of the microphone, or the omnidirectional condenser microphone is disposed in a region of the second receiver that is symmetrical to the first end region of the microphone.
Optionally, the method further includes: a control switch provided between the noise reduction circuit and the second microphone unit, the handset further comprising: a detection circuit and a comparator; wherein,
the detection circuit is configured to: detecting the amplitude of the second audio;
the comparator is configured to: and comparing the amplitude of the second audio detected by the detection circuit with a given amplitude, outputting a signal for controlling the control switch to be opened when the detected amplitude of the second audio is larger than the given amplitude, and outputting a signal for controlling the control switch to be closed when the detected amplitude is not larger than the given amplitude.
Compared with the related art, the technical scheme of the application comprises the following steps: including left ear receiver, right ear receiver, pass through the call delivery hose of first end connection with left ear receiver or right ear receiver, its characterized in that still includes: a first transmitting unit, a second transmitting unit, a separator, a filter, a gain unit, a signal processor and a mixer; the first microphone unit comprises a directional condenser microphone and is used for acquiring a first audio frequency; the second transmitting unit comprises an omnidirectional capacitor microphone and is used for acquiring second audio; the separator is used for: distinguishing and identifying a noise signal in the second audio and a local incoming audio; the filter is used for: filtering the noise signal according to the amplitude and the frequency of the noise signal; the gain unit is used for: performing gain control processing on the noise signal; the signal processor is configured to: adjusting the amplitude and frequency of the local receiving audio obtained by the separator; the mixer is used for: and carrying out sound mixing processing on the noise signal subjected to filtering processing and the local receiving audio subjected to amplitude and frequency adjustment to obtain receiving audio output to a receiver. The embodiment of the utility model provides a communication quality of electrophone has been promoted.
The embodiment of the utility model provides a communication quality of electrophone has been promoted. Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
The accompanying drawings are included to provide a further understanding of the embodiments of the present invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the embodiments of the invention and not to limit the embodiments of the invention.
Fig. 1 is a schematic diagram of a related art headphone;
FIG. 2 is a schematic view of a communication cap for a carrier in accordance with the related art;
FIG. 3 is a block diagram of an embodiment of the handset;
FIG. 4 is a flow chart of an alternative exemplary noise reduction process;
FIG. 5 is a flow chart of a method for noise reduction according to another alternative exemplary application of the present invention;
fig. 6 is a flow chart of an exemplary voice processing method according to an alternative application of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.
The steps illustrated in the flow charts of the figures may be performed in a computer system such as a set of computer-executable instructions. Also, while a logical order is shown in the flow diagrams, in some cases, the steps shown or described may be performed in an order different than here.
Fig. 3 is a block diagram of the handset according to the embodiment of the present invention, as shown in fig. 3, the left ear receiver, the right ear receiver, and the transmitting hose connected to the left ear receiver or the right ear receiver through the first end, the handset 3 further includes: a first microphone unit 31, a second microphone unit 32, a splitter 33, a filter 34, a gain unit 35, a signal processor 36, and a mixer 37; wherein,
the first microphone unit 31 includes a directional condenser microphone for picking up a first audio;
the second transmitting unit 32 includes an omnidirectional condenser microphone for acquiring a second audio;
it should be noted that, the embodiment of the present invention: the first audio frequency of collection generally mainly refers to the voice of operation personnel, can include apart from about 1 ~ 5 centimetres (cm) audio frequency of operation personnel's mouth, differs according to the microphone pickup distance difference. The second audio frequency refers to the ambient sound around the operator, and generally has an audio frequency with a distance of 1-3 m from the operator, and the distance of a pickup with high sensitivity can reach 5-7 m, even 10 m.
The separator 33 is used for: distinguishing and identifying a noise signal in the second audio and a local incoming audio;
the filter 34 is used for: filtering the noise signal according to the amplitude and the frequency of the noise signal;
the gain unit 35 is configured to: performing gain control processing on the noise signal;
the signal processor 36 is configured to: adjusting the amplitude and frequency of the local receiving audio obtained by the separator; here, the voice enhancement of the local receiving audio can be realized through the adjustment of the amplitude and the frequency;
the mixer 37 is connected to the filter and signal processor for: and carrying out sound mixing processing on the noise signal subjected to filtering processing and the local receiving audio subjected to amplitude and frequency adjustment to obtain receiving audio output to a receiver.
Optionally, the transmitter/receiver of the embodiment of the present invention further includes a noise reduction circuit 38 and a correlator 39;
the noise reduction circuit 38 is configured to: determining a noise signal in the environment according to a second audio collected by a second transmitting unit, and performing noise reduction processing on the played communication receiving audio from other transmitters and receivers according to the determined noise signal;
the specific processing of the noise reduction circuit 38 includes: and performing 180-degree phase inversion on the determined noise signal, then playing the noise signal in the receiver, and overlapping the played noise signal after phase inversion with communication receiving voice played in the receiver to realize processing on noise in a sound cavity of the receiver.
It should be noted that, after the phase reversal is performed on the noise signal in the embodiment of the present invention, based on the sensitivities of the human ear to the high-frequency and low-frequency audio signals and the sound insulation characteristics of the headset, a person skilled in the art can perform corresponding amplitude adjustment on the noise signal with different frequencies; generally, a large amplitude adjustment is performed for a high frequency audio signal.
Correlator 39 is used to: performing correlation processing on the first audio acquired by the first voice transmission unit according to the second audio acquired by the second voice transmission unit to obtain the voice transmission audio subjected to noise reduction;
it should be noted that the splitter 33, the filter 34, the gain unit 35, the signal processor 36, the mixer 37, the noise reduction circuit 38, and the correlator 39 according to the embodiment of the present invention may be formed by electronic circuits, integrated circuits, or embedded chips known in the related art.
It should be noted that the present invention provides a directional condenser microphone, which is closer to a sound production position of a worker performing a speech transmission operation than the omnidirectional condenser microphone.
Optionally, the embodiment of the present invention provides a directional condenser microphone 301, which is disposed at the second end of the microphone hose.
Optionally, the second microphone unit 32 according to the embodiment of the present invention includes one or two omnidirectional condenser microphones 302.
Optionally, when the second microphone unit 32 includes the first omnidirectional condenser microphone 302-1 and the second omnidirectional condenser microphone 302-2, the first omnidirectional condenser microphone 302-1 and the second omnidirectional condenser microphone 302-2 are symmetrically disposed on the first receiver and the second receiver, respectively; wherein, the first receiver is a left-ear receiver or a right-ear receiver; the second receiver is another receiver of the headset except the first receiver.
Optionally, the embodiment of the utility model provides a:
when the first end of the microphone tube is arranged on the first receiver, the first omnidirectional condenser microphone is arranged in the first end area of the microphone tube;
when the first end of the microphone is disposed at the second receiver, the second omnidirectional condenser microphone is disposed at the first end region of the microphone.
It should be noted that the coverage of the first end region of the speech hose according to the embodiments of the present invention can be determined by a person skilled in the art according to the purpose of acquiring the second audio.
Optionally, when there is only one omnidirectional condenser microphone in the second transmitting unit 32, the omnidirectional condenser microphone is disposed on the first receiver or the second receiver; wherein, the first receiver is a left-ear receiver or a right-ear receiver; the second receiver is another receiver of the headset except the first receiver.
Optionally, the embodiment of the present invention provides that the first end of the microphone hose set up in during the first receiver, the omnidirectional condenser microphone set up in the first end region of the microphone hose, or, the omnidirectional condenser microphone set up in the second receiver with the first end region of the microphone hose becomes the region of symmetry.
Optionally, the embodiment of the present invention provides a noise reduction circuit with still be provided with control switch between the second microphone unit, electrophone still includes: a detection circuit 310 and a comparator 311; wherein,
the detection circuit 310 is configured to: detecting the amplitude of the second audio;
the comparator 311 is configured to: and comparing the amplitude of the second audio detected by the detection circuit with a given amplitude, outputting a signal for controlling the control switch to be opened when the detected amplitude of the second audio is larger than the given amplitude, and outputting a signal for controlling the control switch to be closed when the detected amplitude is not larger than the given amplitude.
The following is a clear and detailed description of the method according to the embodiments of the present invention through the application examples, which are only used to state the present invention and are not used to limit the protection scope of the present invention.
Application example
The utility model discloses the application example is based on the existing acoustics structural layout of electrophone among the correlation technique, chooses directive property capacitance microphone for the collection of first audio frequency, chooses the omnidirectional capacitance microphone for the collection of second audio frequency, carries out noise reduction processing to first audio frequency through the correlation of the ambient noise in first audio frequency and the second audio frequency, filters the ambient noise in the speech of sending a conversation, improves the speech signal to noise ratio of sending a conversation;
the utility model discloses the application example is through selecting for use the omnidirectional condenser microphone as the reference signal of feedforward noise reduction, carries out 180 degrees reversals and amplitude adjustment to the noise signal, then exports to the receiver and plays, offsets with the noise in the receiver sound chamber, reduces the influence of ambient noise to the receiving voice, realizes the initiative noise reduction and handles;
the utility model discloses the application example can be in the root position of electrophone's send the flexible pipe, arrange an omnidirectional condenser microphone in electrophone opposite side symmetrical position equally, the collection direction of omnidirectional condenser microphone is for the operation personnel send the speech the place ahead, be used for picking up the ambient noise and as the reference signal that the feedforward was fallen the noise;
before the first audio is sent to a far-end for playing, the application example of the utility model carries out correlation processing on the first audio according to the frequency, the amplitude and the phase of the second audio (environmental noise), filters the environmental noise in the speech of sending the speech and improves the signal-to-noise ratio of the speech; it should be noted that how to perform the correlation processing after obtaining the second audio and the first audio is a routine technical means for those skilled in the art.
The utility model discloses application example still includes: the collected second audio is used as a feedforward reference signal for carrying out noise reduction processing on sound in a sound cavity of the transmitter-receiver, the phase of the second audio is subjected to 180-degree inversion and amplitude adjustment, then the second audio is mixed with received voice, and then the second audio is played in the receiver, so that the noise in the sound cavity of the receiver is counteracted, and active noise reduction processing is realized;
optionally, the utility model discloses application example can also improve electrophone physics sound insulation volume through optimizing electrophone's material, with the laminating degree of people's ear or head face portion, ensures electrophone sound chamber's relatively independent, improves the performance of making an uproar of initiatively falling.
Fig. 4 is a flowchart of an alternative application example noise reduction processing method of the present invention, as shown in fig. 4, including:
step 401, a directional condenser microphone picks up the voice of an operator and conditions signals;
step 402, an omnidirectional condenser microphone picks up a noise signal (second audio) in an environment;
step 403, according to the amplitude-frequency characteristics of the noise signal, after the correlation processing is performed on the transmission voice, the transmission voice frequency is output; the utility model discloses the ambient noise among the application example handles the filtering voice noise through the correlation.
Fig. 5 is a flowchart of a method for noise reduction processing according to another optional application example of the present invention, as shown in fig. 5, including:
step 501, an omnidirectional condenser microphone picks up a second audio;
step 502, determining a noise signal in the environment from the picked-up second audio;
step 503, performing 180-degree phase reversal on the noise signal;
and step 504, playing the noise signal after phase inversion in a receiver, and performing superposition processing on the noise signal and the received voice. The application example of the invention superposes the received voice and the original noise signal, thereby achieving the purpose of noise elimination.
Fig. 6 is a flow chart of an exemplary voice processing method according to an alternative application of the present invention, as shown in fig. 6, including:
601, the omnidirectional condenser microphone picks up a second audio frequency, and the second audio frequency is sent to the separator;
step 602, the separator distinguishes and identifies the noise signal in the second audio and the local receiving audio, sends the noise signal to the filter, and sends the local receiving audio to the signal processor; specifically, the environmental sound is identified according to the human voice characteristics, the non-human voice signals are sent to a filter after being separated, and the separated human voice signals are sent to a signal processor;
603, performing signal filtering processing on the filter according to the amplitude and the frequency of the noise signal, and performing automatic gain control on the steady-state noise to compress the amplitude of the noise signal; specifically, the filtering process includes: filtering out impulse noise exceeding 85dB and sound signals outside the human ear identification frequency range of 300 Hz-4000 Hz;
step 604, the signal processor adjusts the amplitude and frequency of the local receiving audio obtained by the separation of the separator; the method specifically comprises the following steps: the gain and frequency compensation of the voice signals are improved, so that the local voice volume is improved to be within the acceptable range of human ears, and the frequency of low-frequency voice is properly improved by utilizing the characteristic that the human ears can more easily identify high-frequency voice, so that the voice identification degree is improved, and the voice enhancement is realized;
step 605, mixing the noise signal after the filtering process and the gain control process, the local receiving audio after the amplitude and frequency adjustment, the communication receiving audio after the audio noise reduction process, and the received communication receiving audio from other transceivers to obtain the receiving audio output to the receivers; the receiving audio in the embodiment of the invention is output to the receiver according to the related technology. The processed environment sound signal and the local voice signal are mixed and sent to a receiver (an air conduction receiver) together with the received voice to be played, so that the environment sound is monitored and the human sound is enhanced;
optionally, the embodiment of the utility model provides a keep unanimous with human sense organ on environmental sound gathers and playback channel: the left ear shell picks up the sound and plays back the left ear and the right ear shell picks up the sound and plays back the right ear. Meanwhile, in the processing processes of dynamic compression, voice enhancement, mixed sound playback and the like, the difference of the left and right picked-up sounds in phase is maintained.
It will be understood by those skilled in the art that all or part of the steps of the above method may be implemented by a program instructing associated hardware (e.g., noise reduction circuit), and the program may be stored in a computer-readable storage medium, such as a read-only memory, a magnetic or optical disk, and the like. Alternatively, all or part of the steps of the above embodiments may be implemented using one or more integrated circuits. Accordingly, each module/unit in the above embodiments may be implemented in a form of hardware, for example, by an integrated circuit to implement its corresponding function, or may be implemented in a form of a software functional module, for example, by a noise reduction circuit to execute a program/instruction stored in a memory to implement its corresponding function. The present invention is not limited to any specific form of hardware or software combination.
Although the embodiments of the present invention have been described above, the description is only for the convenience of understanding the present invention, and the present invention is not limited thereto. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. A handset comprising a left ear receiver, a right ear receiver, and a transmitting hose connected to the left ear receiver or the right ear receiver through a first end portion, characterized by further comprising: a first transmitting unit, a second transmitting unit, a separator, a filter, a gain unit, a signal processor and a mixer; wherein,
the first microphone unit comprises a directional condenser microphone and is used for collecting first audio;
the second transmitting unit comprises an omnidirectional capacitor microphone and is used for acquiring second audio;
the separator is used for: distinguishing and identifying a noise signal in the second audio and a local incoming audio;
the filter is used for: filtering the noise signal according to the amplitude and the frequency of the noise signal;
the gain unit is used for: performing gain control processing on the noise signal;
the signal processor is configured to: adjusting the amplitude and frequency of the local receiving audio obtained by the separator;
the mixer is used for: and carrying out sound mixing processing on the noise signal subjected to filtering processing and the local receiving audio subjected to amplitude and frequency adjustment to obtain receiving audio output to a receiver.
2. A handset as claimed in claim 1, further comprising a noise reduction circuit and a correlator; wherein,
the noise reduction circuit is to: determining a noise signal in the environment according to a second audio collected by a second transmitting unit, and performing noise reduction processing on the played communication receiving audio from other transmitters and receivers according to the determined noise signal;
the correlator is used for: and performing correlation processing on the first audio acquired by the first voice transmission unit according to the second audio acquired by the second voice transmission unit to obtain the voice transmission audio subjected to noise reduction.
3. A handset as claimed in claim 2, characterised in that the mixer is further connected to an output of the noise reduction circuit for:
and mixing the communication receiving audio subjected to the noise reduction processing and the receiving audio output to a receiver.
4. A handset as claimed in claim 1 wherein the directional condenser microphone is disposed at the second end of the microphone tube.
5. A handset as claimed in any one of claims 1 to 4 wherein the second handset comprises one or two omnidirectional condenser microphones.
6. A handset as claimed in claim 5 wherein the omnidirectional condenser microphone comprises a first omnidirectional condenser microphone and a second omnidirectional condenser microphone, the first omnidirectional condenser microphone and the second omnidirectional condenser microphone being disposed symmetrically on the first receiver and the second receiver, respectively;
wherein, the first receiver is a left-ear receiver or a right-ear receiver; the second receiver is another receiver of the headset except the first receiver.
7. A handset as claimed in claim 6,
when the first end of the microphone tube is arranged on the first receiver, the first omnidirectional condenser microphone is arranged in the first end area of the microphone tube;
when the first end of the microphone is disposed at the second receiver, the second omnidirectional condenser microphone is disposed at the first end region of the microphone.
8. A handset as claimed in claim 5, wherein the omni-directional condenser microphone is disposed on the first receiver or the second receiver when there is only one omni-directional condenser microphone in the second handset;
wherein, the first receiver is a left-ear receiver or a right-ear receiver; the second receiver is another receiver of the headset except the first receiver.
9. A handset as claimed in claim 8,
when the first end of the microphone is disposed on the first receiver, the omnidirectional condenser microphone is disposed in the first end region of the microphone, or the omnidirectional condenser microphone is disposed in a region of the second receiver that is symmetrical to the first end region of the microphone.
10. A handset as claimed in any one of claims 1 to 4, further comprising: a control switch provided between the noise reduction circuit and the second microphone unit, the handset further comprising: a detection circuit and a comparator; wherein,
the detection circuit is configured to: detecting the amplitude of the second audio;
the comparator is configured to: and comparing the amplitude of the second audio detected by the detection circuit with a given amplitude, outputting a signal for controlling the control switch to be opened when the detected amplitude of the second audio is larger than the given amplitude, and outputting a signal for controlling the control switch to be closed when the detected amplitude is not larger than the given amplitude.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821592813.4U CN208739372U (en) | 2018-09-28 | 2018-09-28 | A kind of electrophone |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821592813.4U CN208739372U (en) | 2018-09-28 | 2018-09-28 | A kind of electrophone |
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| CN208739372U true CN208739372U (en) | 2019-04-12 |
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| CN201821592813.4U Active CN208739372U (en) | 2018-09-28 | 2018-09-28 | A kind of electrophone |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113038322A (en) * | 2021-03-04 | 2021-06-25 | 聆感智能科技(深圳)有限公司 | Method and device for enhancing environmental perception by hearing |
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2018
- 2018-09-28 CN CN201821592813.4U patent/CN208739372U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113038322A (en) * | 2021-03-04 | 2021-06-25 | 聆感智能科技(深圳)有限公司 | Method and device for enhancing environmental perception by hearing |
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