CN108449689A - A kind of speaker for realizing ultrahigh frequency - Google Patents
A kind of speaker for realizing ultrahigh frequency Download PDFInfo
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- CN108449689A CN108449689A CN201810435326.5A CN201810435326A CN108449689A CN 108449689 A CN108449689 A CN 108449689A CN 201810435326 A CN201810435326 A CN 201810435326A CN 108449689 A CN108449689 A CN 108449689A
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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
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2430/00—Signal processing covered by H04R, not provided for in its groups
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Circuit For Audible Band Transducer (AREA)
Abstract
The present invention relates to the audio signals outside a kind of speaker for realizing ultrahigh frequency, including audio input end reception, and audio signal is sent to signal processing module；The signal processing module, for handling the audio signal, and by treated, audio signal is sent to power amplifier module；The power amplifier module, for treated, audio signal carries out power amplification, and the audio signal of amplification is sent to Hi-Mid unit, bass unit and ultrahigh frequency unit；The voice unit, bass unit and ultrahigh frequency unit blaze abroad amplified audio signal.It can realize that the sound phase difference of the audio signal of each frequency is small in this way, reduction degree is high so that sound, which is closely listened, does not disturb by making noise, clearly；Remote to listen high sensitivity, decaying is small, and sound range is wide, and Sensurround is strong, and the relative inexpensiveness of this equipment.
Description
Technical field
The present invention relates to speaker technology fields, more particularly to a kind of speaker for realizing ultrahigh frequency.
Background technology
In terms of physics principle, sound is divided into height, and the starting point of low frequency is zero, and then gradually deduction is into and high
Frequently.In general, the audio signal of 8000Hz or more just belongs to high frequency, the loud speaker of 16kHz or more high pitchs can be replayed.All unite
Referred to as ultrahigh frequency unit.But, the frequency response range that the ear of ordinary circumstance servant can be heard is 20Hz-20kHz, usually
Sound more than 20kHz, human ear are difficult to distinguish.
It is passed after Karaoke is amplified sound by speaker or loudspeaker with the sound that in large-scale performance, performing artist sends out
Broadcast is gone.Using traditional amplified megaphonia of speaker, serious distortion, original error is gone back, hearer's experience sense is poor.Ultrahigh frequency is difficult to
It is brought into play in entertainment.To avoid the above problem, existing producer uses the equipment part of import, expensive.Cause
This, is badly in need of that a kind of high sensitivity, decaying is small, range is wide and the speaker of relative low price, the i.e. speaker of cost performance superelevation.
Invention content
It made an uproar again using traditional amplified megaphonia of speaker for of the existing technology, serious distortion, go back original error,
The problem of hearer's experience sense is poor, and ultrahigh frequency is difficult to bring into play in entertainment, the present invention provide a kind of ultrahigh frequency of realizing
Speaker.
The concrete scheme of the application is as follows：
A kind of speaker for realizing ultrahigh frequency, including：Sequentially connected audio input end, signal processing module, power amplifier module
With module of raising one's voice；The module of raising one's voice includes：Hi-Mid unit, bass unit and ultrahigh frequency unit；The audio input end is used
Audio signal outside receiving, and audio signal is sent to signal processing module；The signal processing module, for institute
It states audio signal to be handled, and audio signal is sent to power amplifier module by treated；The power amplifier module is used
In treated, audio signal carries out power amplification, and the audio signal of amplification is sent to Hi-Mid unit, bass unit and is surpassed
Voice unit；The voice unit, bass unit and ultrahigh frequency unit blaze abroad amplified audio signal.
Preferably, the ultrahigh frequency unit is the ultrahigh frequency unit of silk ribbon formula or aluminium band type.
Preferably, the signal processing module includes：Low-pass filter circuit, high-pass filtering circuit and superelevation frequency circuit.Institute
Low-pass filter circuit is stated, for handling low frequency and ultralow frequency part in audio signal, obtains high-frequency audio signal；The high pass
Filter circuit obtains middle low-frequency audio signal for handling low frequency and UHF part in audio signal；The logical filter of the superelevation
Wave circuit obtains hyperfrequency audio signal for handling high frequency and medium-high frequency part in audio signal.
Preferably, the low pass circuit includes：First resistor, second resistance, 3rd resistor, the 4th resistance, the 5th resistance,
6th resistance, the 7th resistance, the first inductor, the second inductor, the first capacitance, the second capacitance and third capacitance；Described first
One end of resistance is connected to the positive terminal of signal input part, and one end of the second resistance is connected to the cathode of signal input part
End, the other end of the first resistor connects with the other end of the second resistance, and the other end of the second resistance is also with the
One end of three resistance, the first inductor electrode input end be all connected with, the other end of the 3rd resistor and the first inductor
One end connection of output end, the 4th resistance, the negative input of first inductor is connected to the ground by the 5th resistance, described
The connection of one end of the other end of 4th resistance and the 6th resistance, one end of the 6th resistance also by the second capacitance connection extremely
Ground, the other end of the 6th resistance are connected by the output end of the second capacitance and the second inductor, the 6th resistance it is another
One end is also connected by the electrode input end of the 7th resistance and the second inductor, and the other end of the 7th resistance also passes through the 4th
Capacity earth, the output end connection of the negative input and the second inductor of second inductor, second inductor
Output end is also connected with power amplifier module.
Preferably, the high-frequency circuit includes：4th capacitance, the 5th capacitance, the 8th resistance, the 9th resistance and third inductance
Device；One end connection signal input terminal of 4th capacitance, the other end of the 4th capacitance and one end, the 8th resistance of the 5th capacitance
One end connection, the other end of the 5th capacitance is connected to the ground by the 9th resistance, the other end and third inductor of the 5th capacitance
Electrode input end connection, the output end of the other end of the 8th resistance and the negative input of third inductor, third inductor
It is all connected with, the output end of third inductor is connected with power amplifier module.
Preferably, the superelevation frequency circuit includes：6th capacitance, the 7th capacitance, the 8th capacitance, the tenth resistance, the 11st
Resistance, twelfth resistor, thirteenth resistor, the 14th resistance and the 4th inductor；One end of 6th capacitance and signal are defeated
Enter end connection, the other end of the 6th capacitance is connected to the ground by the tenth resistance, the other end and the 7th capacitance of the 6th capacitance
One end connection, one end of the other end of the 7th capacitance and one end of the 8th capacitance, eleventh resistor is all connected with, the 8th capacitance
The electrode input end of the other end and the 4th inductor, twelfth resistor one end be all connected with, the connection of the other end of twelfth resistor
To ground, one end of thirteenth resistor, the 14th resistance one end connected with the negative input of the 4th inductor, the 13rd electricity
The other end of resistance is connected to the ground, the output end of the other end of the 14th resistance and the other end of eleventh resistor, the 4th inductor
It is all connected with, the output end of the 4th inductor is also connected with power amplifier module.
Preferably, Hi-Mid unit, bass unit and ultrahigh frequency unit are arranged on the front panel of babinet, ultrahigh frequency list
Member is arranged in the centre of Hi-Mid unit.
Preferably, the bass unit is round or rectangular, and the Hi-Mid unit is rectangular, round and special-shaped one
Kind, the ultrahigh frequency unit is round or rectangular.
Compared with prior art, the present invention has the advantages that：
The speaker of the realization ultrahigh frequency of this programme handles high frequency and hyperfrequency in audio signal by the low-pass filter circuit
Part obtains the small and voice thickness high-frequency audio signal that is delayed；Low frequency in high-pass filtering circuit processing audio signal and
UHF part obtains the low-frequency audio signal in small and voice thickness that is delayed；Low frequency in the superelevation processing of circuit audio signal
With medium-high frequency part, the small and voice thickness hyperfrequency audio signal that is delayed is obtained.The audio letter of each frequency can be realized in this way
Number sound phase difference it is small, reduction degree is high so that sound, which is closely listened, does not disturb by making noise, clearly；Remote to listen high sensitivity, decaying is small, and sound range is wide,
Sensurround is strong, and the relative inexpensiveness of this equipment.
Description of the drawings
Fig. 1 is the functional block diagram of the speaker of the realization ultrahigh frequency of an embodiment.
Fig. 2 is the front panel figure of the babinet of the speaker of the realization ultrahigh frequency of an embodiment.
Fig. 3 is the low-pass filter circuit figure of an embodiment.
Fig. 4 is the high-pass filtering circuit figure of an embodiment.
Fig. 5 is the superelevation bandpass filter circuit of an embodiment.
Specific implementation mode
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art
The every other embodiment obtained without creative efforts, shall fall within the protection scope of the present invention.
Referring to Fig. 1-5, a kind of speaker for realizing ultrahigh frequency, including：Sequentially connected audio input end 11, signal processing mould
Block 12, power amplifier module 13 and module 14 of raising one's voice；The module 14 of raising one's voice includes：Hi-Mid unit 2, bass unit 1 and super
Voice unit 3；Audio signal for receiving external audio signal, and is sent to signal processing by the audio input end 11
Module 12；The signal processing module 12, for handling the audio signal, and by treated, audio signal is sent
To power amplifier module 13；The power amplifier module 13, for treated, audio signal carries out power amplification, by amplification
Audio signal is sent to Hi-Mid unit 2, bass unit 1 and ultrahigh frequency unit 3；The voice unit, bass unit 1 and superelevation
Sound unit 3 blazes abroad amplified audio signal.
In the present embodiment, the ultrahigh frequency unit 3 is the ultrahigh frequency unit 3 of silk ribbon formula or aluminium band type.
In the present embodiment, the signal processing module 12 includes：Low-pass filter circuit, high-pass filtering circuit and hyperfrequency electricity
Road.The low-pass filter circuit obtains high-frequency audio signal for handling low frequency and ultralow frequency part in audio signal；Institute
High-pass filtering circuit is stated, for handling high frequency and UHF part in audio signal, obtains middle low-frequency audio signal；It is described super
High-frequency circuit obtains hyperfrequency audio signal for handling low frequency and medium-high frequency part in audio signal.
In the present embodiment, the low pass circuit includes：First resistor R1, second resistance R2,3rd resistor R3, the 4th resistance
R4, the 5th resistance R5, the 6th resistance R6, the 7th resistance R7, the first inductor N1, the second inductor N2, the first capacitance C1, second
Capacitance C2 and third capacitance C3；One end of the first resistor R1 is connected to the positive terminal of signal input part, the second resistance
One end of R2 is connected to the negative pole end of signal input part, and the other end of the first resistor R1 and the second resistance R2's is another
End connection, the other end of the second resistance R2 are also equal with the electrode input end of one end of 3rd resistor R3, the first inductor N1
Connection, one end connection of the output end, the 4th resistance R4 of the other end of the 3rd resistor R3 and the first inductor N1, described the
The negative input of one inductor N1 is connected to the ground by the 5th resistance R5, the other end and the 6th resistance of the 4th resistance R4
One end of R6 connects, and one end of the 6th resistance R6 is also connected to the ground by the second capacitance C2, and the 6th resistance R6's is another
One end is connected by the output end of the second capacitance C2 and the second inductor N2, and the other end of the 6th resistance R6 also passes through the 7th
The electrode input end of resistance R7 and the second inductor N2 connect, and the other end of the 7th resistance R7 is also connect by the 4th capacitance
Ground, the output end connection of the negative input and the second inductor N2 of the second inductor N2, the second inductor N2's
Output end is also connected with power amplifier module 13.
In the present embodiment, the high-pass filtering circuit includes：4th capacitance C4, the 5th capacitance C5, the 8th resistance R8, the 9th
Resistance R9 and third inductor N3；One end connection signal input terminal of the 4th capacitance C4, the other end of the 4th capacitance C4 and
One end of 5th capacitance C5, one end connection of the 8th resistance R8, the other end of the 5th capacitance C5 are connected to by the 9th resistance R9
The other end on ground, the 5th capacitance C5 is connected with the electrode input end of third inductor N3, the other end and third of the 8th resistance R8
The negative input of inductor N3, the output end of third inductor N3 are all connected with, and the output end and power of third inductor N3 are put
Big module 13 connects.
In the present embodiment, the superelevation frequency circuit includes：6th capacitance C6, the 7th capacitance C7, the 8th capacitance C8, the tenth electricity
Hinder R10, eleventh resistor R11, twelfth resistor R12, thirteenth resistor R13, the 14th resistance R14 and the 4th inductor N4；
One end of the 6th capacitance C6 is connected with signal input part, and the other end of the 6th capacitance C6 is connected by the tenth resistance R10
It is connected to ground, one end connection of the other end and the 7th capacitance C7 of the 6th capacitance C6, the other end and the 8th capacitance of the 7th capacitance C7
One end of C8, one end of eleventh resistor R11 are all connected with, the anode input of the other end and the 4th inductor N4 of the 8th capacitance C8
End, twelfth resistor R12 one end be all connected with, the other end of twelfth resistor R12 is connected to the ground, the one of thirteenth resistor R13
It holds, one end of the 14th resistance R14 is connected with the negative input of the 4th inductor N4, the other end of thirteenth resistor R13
It is connected to the ground, the other end of the 14th resistance R14 and the other end of eleventh resistor R11, the output end of the 4th inductor N4 are equal
The output end of connection, the 4th inductor N4 is also connected with power amplifier module 13.
In the present embodiment, Hi-Mid unit 2, bass unit 1 and ultrahigh frequency unit 3 are arranged on the front panel of babinet,
Ultrahigh frequency unit 3 is arranged in the centre of Hi-Mid unit.
In the present embodiment, the bass unit 1 is round or rectangular, and the Hi-Mid unit 2 is rectangular, round and special-shaped
One kind, the ultrahigh frequency unit 3 is round or rectangular.
The speaker of the realization ultrahigh frequency of this programme handles the low frequency in audio signal by the low-pass filter circuit and surpasses
Low frequency part obtains the small and voice thickness high-frequency audio signal that is delayed；Height in the high-pass filtering circuit processing audio signal
Frequency and UHF part obtain the small and voice thickness middle low-frequency audio signal that is delayed；The hyperfrequency processing of circuit audio signal
In low frequency and medium-high frequency part, obtain being delayed small and voice thickness hyperfrequency audio signal.Each frequency can be realized in this way
Audio signal sound phase difference it is small, reduction degree is high so that sound, which is closely listened, does not disturb by making noise, clearly；It is remote to listen high sensitivity, small, sound of decaying
Sound range is wide, and Sensurround is strong, and the relative inexpensiveness of this equipment.
Several embodiments of the invention above described embodiment only expresses, the description thereof is more specific and detailed, but simultaneously
It cannot therefore be construed as limiting the scope of the patent.It should be pointed out that coming for those of ordinary skill in the art
It says, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to the protection of the present invention
Range.Therefore, the protection domain of patent of the present invention should be determined by the appended claims.
Claims (8)
1. a kind of speaker for realizing ultrahigh frequency, which is characterized in that including：Sequentially connected audio input end, signal processing module,
Power amplifier module and module of raising one's voice；
The module of raising one's voice includes：Hi-Mid unit, bass unit and ultrahigh frequency unit；
Audio signal for receiving external audio signal, and is sent to signal processing module by the audio input end；
The signal processing module, for handling the audio signal, and by treated, audio signal is sent to work(
Rate amplification module；
The power amplifier module, for treated, audio signal carries out power amplification, and the audio signal of amplification is sent to
Hi-Mid unit, bass unit and ultrahigh frequency unit；
The voice unit, bass unit and ultrahigh frequency unit blaze abroad amplified audio signal.
2. it is according to claim 1 realize ultrahigh frequency speaker, which is characterized in that the ultrahigh frequency unit be silk ribbon formula or
The ultrahigh frequency unit of person's aluminium band type.
3. the speaker according to claim 1 for realizing ultrahigh frequency, which is characterized in that the signal processing module includes：It is low
Bandpass filter circuit, high-pass filtering circuit and superelevation bandpass filter circuit；
The low-pass filter circuit obtains high-frequency audio signal for handling low frequency and ultralow frequency part in audio signal；
The high-pass filtering circuit obtains middle low-frequency audio signal for handling high frequency and UHF part in audio signal；
The superelevation frequency circuit obtains hyperfrequency audio signal for handling low frequency and medium-high frequency part in audio signal.
4. the speaker according to claim 3 for realizing ultrahigh frequency, which is characterized in that the low pass circuit includes：First electricity
Resistance, second resistance, 3rd resistor, the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance, the first inductor, the second inductance
Device, the first capacitance, the second capacitance and third capacitance；
One end of the first resistor is connected to the positive terminal of signal input part, and it is defeated that one end of the second resistance is connected to signal
Enter the negative pole end at end, the other end of the first resistor is connected with the other end of the second resistance, the second resistance it is another
Electrode input end of the one end also with one end of 3rd resistor, the first inductor is all connected with, the other end of the 3rd resistor and
One end connection of the output end of one inductor, the 4th resistance, the negative input of first inductor are connected by the 5th resistance
It is connected to ground, one end connection of the other end and the 6th resistance of the 4th resistance, one end of the 6th resistance also passes through second
Capacitance connection to ground, the other end of the 6th resistance is connected by the output end of the second capacitance and the second inductor, and described the
The other end of six resistance is also connected by the electrode input end of the 7th resistance and the second inductor, the other end of the 7th resistance
Also by the 4th capacity earth, the output end connection of the negative input and the second inductor of second inductor, described the
The output end of two inductors is also connected with power amplifier module.
5. the speaker according to claim 4 for realizing ultrahigh frequency, which is characterized in that the high-pass filtering circuit includes：The
Four capacitances, the 5th capacitance, the 8th resistance, the 9th resistance and third inductor；
One end connection signal input terminal of 4th capacitance, the other end of the 4th capacitance and one end of the 5th capacitance, the 8th electricity
One end of resistance connects, and the other end of the 5th capacitance is connected to the ground by the 9th resistance, the other end and third inductance of the 5th capacitance
The electrode input end of device connects, the output of the other end of the 8th resistance and the negative input, third inductor of third inductor
End is all connected with, and the output end of third inductor is connected with power amplifier module.
6. the speaker according to claim 4 for realizing ultrahigh frequency, which is characterized in that including：6th capacitance, the 7th capacitance,
8th capacitance, the tenth resistance, eleventh resistor, twelfth resistor, thirteenth resistor, the 14th resistance and the 4th inductor；
One end of 6th capacitance is connected with signal input part, and the other end of the 6th capacitance is connected to by the tenth resistance
Ground, one end connection of the other end and the 7th capacitance of the 6th capacitance, the other end of the 7th capacitance and one end of the 8th capacitance, the tenth
One end of one resistance is all connected with, one end of the other end of the 8th capacitance and the electrode input end of the 4th inductor, twelfth resistor
Be all connected with, the other end of twelfth resistor is connected to the ground, one end of thirteenth resistor, the 14th resistance one end and the 4th electricity
The negative input of sensor connects, and the other end of thirteenth resistor is connected to the ground, the other end of the 14th resistance and the 11st electricity
The other end of resistance, the 4th inductor output end be all connected with, the output end of the 4th inductor is also connected with power amplifier module.
7. the speaker according to claim 1 for realizing ultrahigh frequency, which is characterized in that Hi-Mid unit, bass unit and super
Voice unit is arranged on the front panel of babinet, and ultrahigh frequency unit is arranged in the centre of Hi-Mid unit.
8. the speaker according to claim 7 for realizing ultrahigh frequency, which is characterized in that the bass unit is round or side
Shape, the Hi-Mid unit are rectangular, round and special-shaped one kind, and the ultrahigh frequency unit is round or rectangular.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810435326.5A CN108449689A (en) | 2018-05-09 | 2018-05-09 | A kind of speaker for realizing ultrahigh frequency |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810435326.5A CN108449689A (en) | 2018-05-09 | 2018-05-09 | A kind of speaker for realizing ultrahigh frequency |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108449689A true CN108449689A (en) | 2018-08-24 |
Family
ID=63203296
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810435326.5A Pending CN108449689A (en) | 2018-05-09 | 2018-05-09 | A kind of speaker for realizing ultrahigh frequency |
Country Status (1)
| Country | Link |
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| CN (1) | CN108449689A (en) |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0534084A1 (en) * | 1991-09-21 | 1993-03-31 | Mercedes-Benz Ag | Speaker system and circuit on the roof of the passenger compartment of a vehicle |
| JPH07203581A (en) * | 1993-12-29 | 1995-08-04 | Matsushita Electric Ind Co Ltd | Directional speaker system |
| JPH09200885A (en) * | 1996-01-11 | 1997-07-31 | Matsushita Electric Ind Co Ltd | On-vehicle speaker equipment |
| CN1723739A (en) * | 2002-11-15 | 2006-01-18 | 索尼株式会社 | Audio signal processing method and processing device |
| CN201210742Y (en) * | 2008-06-23 | 2009-03-18 | 黄圣棠 | Air pressure balance type sound box |
| CN201230368Y (en) * | 2008-07-17 | 2009-04-29 | 刘自华 | Electronic tube and solid electronic sound division mixing power amplifier |
| CN101489163A (en) * | 2009-02-16 | 2009-07-22 | 叶金尧 | Matrix high pitch KTV sound box |
| US20100054521A1 (en) * | 2008-09-04 | 2010-03-04 | Compal Electronics, Inc. | Electronic device |
| CN103546844A (en) * | 2012-07-11 | 2014-01-29 | 黄庆聪 | Multi-frictional-frequency loudspeaker box using three-dimensional wide-angle sound wave diffusion |
| CN207010920U (en) * | 2017-07-17 | 2018-02-13 | 深圳市其力音频应用有限公司 | A kind of built-in earplug and earphone of achievable acoustic coding |
-
2018
- 2018-05-09 CN CN201810435326.5A patent/CN108449689A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0534084A1 (en) * | 1991-09-21 | 1993-03-31 | Mercedes-Benz Ag | Speaker system and circuit on the roof of the passenger compartment of a vehicle |
| JPH07203581A (en) * | 1993-12-29 | 1995-08-04 | Matsushita Electric Ind Co Ltd | Directional speaker system |
| JPH09200885A (en) * | 1996-01-11 | 1997-07-31 | Matsushita Electric Ind Co Ltd | On-vehicle speaker equipment |
| CN1723739A (en) * | 2002-11-15 | 2006-01-18 | 索尼株式会社 | Audio signal processing method and processing device |
| CN201210742Y (en) * | 2008-06-23 | 2009-03-18 | 黄圣棠 | Air pressure balance type sound box |
| CN201230368Y (en) * | 2008-07-17 | 2009-04-29 | 刘自华 | Electronic tube and solid electronic sound division mixing power amplifier |
| US20100054521A1 (en) * | 2008-09-04 | 2010-03-04 | Compal Electronics, Inc. | Electronic device |
| CN101489163A (en) * | 2009-02-16 | 2009-07-22 | 叶金尧 | Matrix high pitch KTV sound box |
| CN103546844A (en) * | 2012-07-11 | 2014-01-29 | 黄庆聪 | Multi-frictional-frequency loudspeaker box using three-dimensional wide-angle sound wave diffusion |
| CN207010920U (en) * | 2017-07-17 | 2018-02-13 | 深圳市其力音频应用有限公司 | A kind of built-in earplug and earphone of achievable acoustic coding |
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Application publication date: 20180824 |
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| RJ01 | Rejection of invention patent application after publication |