CN106887223A - A kind of musical instrument loudspeaker remote intelligent control system - Google Patents
A kind of musical instrument loudspeaker remote intelligent control system Download PDFInfo
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- CN106887223A CN106887223A CN201710097570.0A CN201710097570A CN106887223A CN 106887223 A CN106887223 A CN 106887223A CN 201710097570 A CN201710097570 A CN 201710097570A CN 106887223 A CN106887223 A CN 106887223A
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- circuit
- loudspeaker
- signal
- intelligent control
- musical instrument
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- 230000003321 amplification Effects 0.000 claims abstract description 22
- 238000004891 communication Methods 0.000 claims abstract description 22
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 22
- 238000012545 processing Methods 0.000 claims abstract description 13
- 238000006243 chemical reaction Methods 0.000 claims abstract description 12
- 239000013307 optical fiber Substances 0.000 claims abstract description 12
- 230000000694 effects Effects 0.000 claims abstract description 8
- 230000005236 sound signal Effects 0.000 claims abstract description 7
- 230000002708 enhancing effect Effects 0.000 claims abstract description 3
- 238000001914 filtration Methods 0.000 claims description 6
- 230000010354 integration Effects 0.000 claims description 6
- 238000004377 microelectronic Methods 0.000 claims description 5
- 230000000712 assembly Effects 0.000 claims description 3
- 238000000429 assembly Methods 0.000 claims description 3
- 230000005540 biological transmission Effects 0.000 claims description 3
- 230000003139 buffering effect Effects 0.000 claims description 3
- 239000003990 capacitor Substances 0.000 claims description 3
- 230000009977 dual effect Effects 0.000 claims description 3
- 238000012546 transfer Methods 0.000 claims description 3
- 238000000034 method Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 210000000056 organ Anatomy 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000035807 sensation Effects 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 230000002889 sympathetic effect Effects 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
- 210000002268 wool Anatomy 0.000 description 1
Classifications
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10H—ELECTROPHONIC MUSICAL INSTRUMENTS; INSTRUMENTS IN WHICH THE TONES ARE GENERATED BY ELECTROMECHANICAL MEANS OR ELECTRONIC GENERATORS, OR IN WHICH THE TONES ARE SYNTHESISED FROM A DATA STORE
- G10H1/00—Details of electrophonic musical instruments
- G10H1/0008—Associated control or indicating means
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10H—ELECTROPHONIC MUSICAL INSTRUMENTS; INSTRUMENTS IN WHICH THE TONES ARE GENERATED BY ELECTROMECHANICAL MEANS OR ELECTRONIC GENERATORS, OR IN WHICH THE TONES ARE SYNTHESISED FROM A DATA STORE
- G10H1/00—Details of electrophonic musical instruments
- G10H1/32—Constructional details
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H11/00—Networks using active elements
- H03H11/02—Multiple-port networks
- H03H11/04—Frequency selective two-port networks
- H03H11/12—Frequency selective two-port networks using amplifiers with feedback
- H03H11/1217—Frequency selective two-port networks using amplifiers with feedback using a plurality of operational amplifiers
- H03H11/1234—Modifications to reduce detrimental influences of amplifier imperfections, e.g. limited gain-bandwith product, limited input impedance
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/01—Protocols
- H04L67/02—Protocols based on web technology, e.g. hypertext transfer protocol [HTTP]
- H04L67/025—Protocols based on web technology, e.g. hypertext transfer protocol [HTTP] for remote control or remote monitoring of applications
-
- 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
- H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
- H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Multimedia (AREA)
- Computer Networks & Wireless Communication (AREA)
- Health & Medical Sciences (AREA)
- Otolaryngology (AREA)
- Circuit For Audible Band Transducer (AREA)
Abstract
The present invention relates to loudspeaker control system technical field, and in particular to a kind of musical instrument loudspeaker remote intelligent control system, including communication system, remote control terminal, power amplification system, low-pass filter circuit, protection circuit, bus system and central processing system；Power amplification system of the present invention is used for from the small signals amplification of source of sound or pre-amplifier, after central processing system is changed in signal conversion, transmitted to remote control terminal by optical-fibre communications, realize long-distance intelligent control, low pass filter is by low frequency signal by without allowing, the circuit that high-frequency signal passes through, its effect is to filter off the middle pitch and treble contribution in audio signal, enhancing bass contribution is with the bass unit of drive the speaker, the bass experience sense of loudspeaker can be increased, protection circuit has output power, two channel gain differences are small, switching on and shutting down loudspeaker is without impulsive sound and reliable overheat overload short circuit protection.Simple structure of the present invention, intelligence degree is high, and the scope of application is wider, with very strong creativeness.
Description
Technical field
The present invention relates to loudspeaker control system technical field, and in particular to a kind of musical instrument loudspeaker long-distance intelligent control
System.
Background technology
Loudspeaker is a kind of energy transducer for electric signal being changed into acoustical signal, the good and bad shadow to tonequality of performance of loudspeaker
Sound is very big.Loudspeaker is a most weak device in stereo set, and for acoustics, it is again one most heavy
The part wanted.The species of loudspeaker is various, and price differs greatly.Audio electric energy is made by electromagnetism, piezoelectricity or electrostatic effect
Its cone or diaphragm vibration simultaneously produce resonance (sympathetic response) and send sound with the air of surrounding.Low-grade plastic loudspeaker box is because of its casing list
It is thin, resonance cannot be overcome, can say without tonequality (plastic loudspeaker box for also having part to design will be far better than wooden acoustic box inferior)；
Wood cabinet reduces the sound dye caused by casing resonance, and tonequality is generally better than plastic loudspeaker box.Usual multimedia loudspeaker box is all double
Unit two divided-frequency is designed, and a less loudspeaker is responsible for the output of alt, and another larger loudspeaker is low in being responsible for
The output of sound.Select the material that audio amplifier is considered as the two loudspeaker：The voice unit of active multimedia loudspeaker boxes is existing to be with soft top dome
(in addition with titanium film top dome for simulating source of sound etc.), it is engaged with digital tone source can reduce the stiff of high-frequency signal to master
Sense, gives gentle, smooth, fine and smooth sensation.Multimedia loudspeaker box is existing with the preferable cortina of quality and lower-cost PV films etc.
Soft top dome it is in the majority.
Bass unit it the characteristics of determine the sound of audio amplifier, selection gets up more relatively important, most common to have following
It is several：Cone, has deposited gummed paper basin, paper substrate wool basin, to press basin processed etc. several again.Cone tone color is natural, cheap, preferably firm
Property, the more agile sensitivity of material it is high, uniformity is difficult to control to when having the disadvantage poor moisture resistance, manufacture, but uses paper in top HiFi systems
Can be found everywhere for basin manufacture, it is Well-recovered because sound output is very average.Bulletproof cloth, has frequency response wider with relatively low mistake
Very, it is to like ardently first choice of powerful bass person, has the disadvantage high cost, complex manufacturing technology, sensitivity light music effect not high not very
It is good.Chinese musical instruments manufacturing has basically formed more complete industrial production system, and institute in the world can be processed substantially
There is big kind musical instrument, covering extensive fields, kind is numerous, about different classes of more than 1200 models such as piano, violin, western wind instrument,
Specification more than 30,000, the big kind musical instrument such as piano.Its product has formed Virtual production general layout, piano iron plate, soundboard, hammered string instrument,
The main piano part specialty processing factory such as shell initially forms scale.In the patent document of Patent No. CN201410786211
In, disclose a kind of speaker system of musical instrument, including audio collection unit, signal conversion unit, filter unit and output list
Unit；The audio collection unit has collection terminal, the sound for gathering musical instrument, the output end connection letter of audio collection unit
Number converting unit, the signal conversion unit is used to convert audio signals into analog signal, and the filter unit is located at signal
Between converting unit and output unit, for being filtered to analog signal after again by output unit play.The present invention has to be made
With convenient, directly perceived accurate, can be used for pitching instrument, organ stop, metronome of various musical instruments etc..
It is easy to use, directly perceived accurate that above-mentioned patent document has, and can be used for pitching instrument, organ stop, the beat of various musical instruments
Device etc..But for how to provide a kind of simple structure, simple operation, intelligence degree is high, the wider array of musical instrument of the scope of application is raised
Sound device remote intelligent control system lacks technical solution.
The content of the invention
(1) technical problem for solving
In view of the shortcomings of the prior art, the invention provides a kind of musical instrument loudspeaker remote intelligent control system, it is used for
What is solved a kind of simple structure is provided, simple operation, intelligence degree is high, the wider array of long-range intelligence of musical instrument loudspeaker of the scope of application
The problem of energy control system.
(2) technical scheme
To realize object above, the present invention is achieved by the following technical programs：
A kind of musical instrument loudspeaker remote intelligent control system, including instrumental audio output system and speaker system, its
It is characterised by：Including communication system, remote control terminal, power amplification system, low-pass filter circuit, protection circuit, bus system and in
Centre processing system, the communication system is used for remote transmission signal, and the communication system includes optical-fibre communications, wireless routing, letter
Number conversion and signal relaying, the power amplification system are used for from the small signals amplification of source of sound or pre-amplifier, and the signal turns
After central processing system of changing commanders conversion, transmitted to remote control terminal by optical-fibre communications, the wireless routing can be by optical-fibre communications
In signal transmitted to mobile device in wireless form, the instrumental audio output system will be input into after signal integration to
Central processing system, central processing system will be sent to power amplification system, the power amplification system and the loudspeaker after signal integration
System is connected for final sounding, and the bus system is used as the data transfer in system, and the low pass filter is by low frequency
By the circuit without allowing medium, high frequency signal to pass through, its effect is to filter off the middle pitch and treble contribution in audio signal to signal, is increased
Strong bass contribution is with the bass unit of drive the speaker.
Preferably, the low-pass filter circuit is to be based on from the amplifier TL062, TL062 of ST microelectronics being one double high defeated
Entering impedance J-FET operational amplifiers has low-down power consumption and high pressure Slew Rate.
Preferably, two operational amplifiers of the TLC062 of the low-pass filter circuit, first is wired as frequency mixer
And the preamplifier stage, left, R channel is connected to the IC1a mixing of inverting input, and the gain of first stage can be adjusted and made
It is by filter assemblies R5, the network connection that R6, R7, R8, C4 and C5 are constituted to second with the pot R3.The output first stage
The input in stage.
Preferably, second operational amplifier (IC1B) of the low-pass filter circuit, can be in 7 pin used as a buffering area
TLC062 and filtering export.
Preferably, the TDA1521A of the protection circuit uses nine pin single in-line Plastic Packages, with power output
Greatly, two channel gain differences are small, switching on and shutting down loudspeaker without impulsive sound and reliably, protect by overheat overload short circuit.
Preferably, TDA1521A can both be powered with positive-negative power, it is also possible to which single supply is powered, and during dual power supply, can be saved
Two audio output electric capacity are removed, more preferably, when single supply is powered, power filtering capacitor should be close proximity to integrated circuit for bass tonequality high
Power end, with avoid circuit inside self-excitation.
Preferably, the bus system include data highway system and general line controlling system, the data highway system and
General line controlling system is duplex channel system.
(3) beneficial effect
Power amplification system of the present invention is used for from the small signals amplification of source of sound or pre-amplifier, and signal conversion processes center
After system conversion, transmitted to remote control terminal by optical-fibre communications, realize long-distance intelligent control, low pass filter is by low frequency signal
By the circuit without allowing medium, high frequency signal to pass through, its effect is to filter off the middle pitch and treble contribution in audio signal, is strengthened low
Sound composition can increase the bass experience sense of loudspeaker with the bass unit of drive the speaker, and low-pass filter circuit is based on from ST
The amplifier TL062, TL062 of microelectronics are that a double high input impedance J-FET operational amplifiers have low-down power consumption and height
Slew rate, the TDA1521A of protection circuit uses nine pin single in-line Plastic Packages, with output power, two channel gains
Small, the switching on and shutting down loudspeaker of difference is without impulsive sound and reliable overheat overload short circuit protection.Simple structure of the present invention, simple operation, intelligence
Can change that degree is high, the scope of application is wider, with very strong creativeness.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
The accompanying drawing to be used needed for having technology description is briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can be with
Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is the schematic diagram of protection circuit of the invention；
Fig. 2 is low-pass filter circuit schematic diagram of the invention.
Specific embodiment
To make the purpose, technical scheme and advantage of the embodiment of the present invention clearer, below in conjunction with the embodiment of the present invention
In accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is
A part of embodiment of the present invention, rather than whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art
The every other embodiment obtained under the premise of creative work is not made, belongs to the scope of protection of the invention.
A kind of musical instrument loudspeaker remote intelligent control system as shown in Figure 1-2, including instrumental audio output system and
Speaker system, also including communication system, remote control terminal, power amplification system, low-pass filter circuit, protection circuit, bus system
And central processing system, for remote transmission signal, communication system includes that optical-fibre communications, wireless routing, signal turn to communication system
Change is used for from the small signals amplification of source of sound or pre-amplifier with signal relaying, power amplification system, and signal conversion processes center
After system conversion, transmitted to remote control terminal by optical-fibre communications, wireless routing can be by the signal in optical-fibre communications with wireless
Form is transmitted to mobile device, and instrumental audio output system will be input into central processing system, centre after signal integration
Reason system will be sent to power amplification system after signal integration, power amplification system is connected for final sounding, bus with speaker system
System be used as system in data transfer, low pass filter by low frequency signal by the circuit without allowing medium, high frequency signal to pass through,
Its effect is to filter off the middle pitch and treble contribution in audio signal, and enhancing bass contribution is with the bass unit of drive the speaker.
Low-pass filter circuit is to be based on from the amplifier TL062, TL062 of ST microelectronics being a double high input impedance J-FET
Operational amplifier has low-down power consumption and high pressure Slew Rate.
Two operational amplifiers of TLC062 of low-pass filter circuit, first is wired as frequency mixer and preamplifier
Stage, left, R channel is connected to the IC1a mixing of inverting input, and the gain of first stage can adjust defeated using pot R3.The
It is the input of the network connection of R6, R7, R8, C4 and C5 composition to second stage by filter assemblies R5 to go out the first stage.
Second operational amplifier (IC1B) of low-pass filter circuit as a buffering area, can in the TLC062 of 7 pin and
Filtering output.
The TDA1521A of protection circuit uses nine pin single in-line Plastic Packages, increases with output power, two sound channels
Benefit small, the switching on and shutting down loudspeaker of difference is without impulsive sound and reliable overheat overload short circuit protection.
TDA1521A can both be powered with positive-negative power, it is also possible to which single supply is powered, and during dual power supply, can save two sounds
Frequency output capacitance, more preferably, when single supply is powered, power filtering capacitor should be close proximity to the power supply of integrated circuit for bass tonequality high
End, to avoid circuit inside self-excitation.
Bus system includes data highway system and general line controlling system, and data highway system and general line controlling system are
Duplex channel system.
Power amplification system of the present invention is used for from the small signals amplification of source of sound or pre-amplifier, and signal conversion processes center
After system conversion, transmitted to remote control terminal by optical-fibre communications, realize long-distance intelligent control, low pass filter is by low frequency signal
By the circuit without allowing medium, high frequency signal to pass through, its effect is to filter off the middle pitch and treble contribution in audio signal, is strengthened low
Sound composition can increase the bass experience sense of loudspeaker with the bass unit of drive the speaker, and low-pass filter circuit is based on from ST
The amplifier TL062, TL062 of microelectronics are that a double high input impedance J-FET operational amplifiers have low-down power consumption and height
Slew rate, the TDA1521A of protection circuit uses nine pin single in-line Plastic Packages, with output power, two channel gains
Small, the switching on and shutting down loudspeaker of difference is without impulsive sound and reliable overheat overload short circuit protection.Simple structure of the present invention, simple operation, intelligence
Can change that degree is high, the scope of application is wider, with very strong creativeness.
It should be noted that herein, such as first and second or the like relational terms are used merely to a reality
Body or operation make a distinction with another entity or operation, and not necessarily require or imply these entities or deposited between operating
In any this actual relation or order.And, term " including ", "comprising" or its any other variant be intended to
Nonexcludability is included, so that process, method, article or equipment including a series of key elements not only will including those
Element, but also other key elements including being not expressly set out, or also include being this process, method, article or equipment
Intrinsic key element.In the absence of more restrictions, the key element limited by sentence "including a ...", it is not excluded that
Also there is other identical element in process, method, article or equipment including the key element.
The above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although with reference to the foregoing embodiments
The present invention has been described in detail, it will be understood by those within the art that：It still can be to foregoing each implementation
Technical scheme described in example is modified, or carries out equivalent to which part technical characteristic；And these modification or
Replace, do not make the spirit and scope of the essence disengaging various embodiments of the present invention technical scheme of appropriate technical solution.
Claims (7)
1. a kind of musical instrument loudspeaker remote intelligent control system, including instrumental audio output system and speaker system, it is special
Levy and be：Including communication system, remote control terminal, power amplification system, low-pass filter circuit, protection circuit, bus system and center
Processing system, the communication system is used for remote transmission signal, and the communication system includes optical-fibre communications, wireless routing, signal
Conversion and signal relaying, the power amplification system are used for from the small signals amplification of source of sound or pre-amplifier, and the signal is changed
After central processing system is changed, transmitted to remote control terminal by optical-fibre communications, the wireless routing can be by optical-fibre communications
Signal transmitted to mobile device in wireless form, the instrumental audio output system will be input into after signal integration
Centre processing system, central processing system will be sent to power amplification system, the power amplification system and the loudspeaker system after signal integration
System is connected for final sounding, and the bus system is used as the data transfer in system, and the low pass filter is believed by low frequency
Number by the circuit without allowing medium, high frequency signal to pass through, its effect is to filter off the middle pitch and treble contribution in audio signal, enhancing
Bass contribution is with the bass unit of drive the speaker.
2. musical instrument loudspeaker remote intelligent control system according to claim 1, it is characterised in that：The LPF
Circuit is to be based on being that a double high input impedance J-FET operational amplifiers have from the amplifier TL062, TL062 of ST microelectronics non-
Often low power consumption and high pressure Slew Rate.
3. musical instrument loudspeaker remote intelligent control system according to claim 1, it is characterised in that：The LPF
Two operational amplifiers of TLC062 of circuit, first is wired as frequency mixer and the preamplifier stage, and left, R channel connects
The IC1a mixing of inverting input is connected to, it is to pass through that the gain of first stage can be adjusted using the pot R3.The output first stage
Input of the network connection of filter assemblies R5, R6, R7, R8, C4 and C5 composition to second stage.
4. musical instrument loudspeaker remote intelligent control system according to claim 1, it is characterised in that：The LPF
Second operational amplifier (IC1B) of circuit can export as a buffering area in the TLC062 of 7 pin and filtering.
5. musical instrument loudspeaker remote intelligent control system according to claim 1, it is characterised in that：The protection circuit
TDA1521A use nine pin single in-line Plastic Packages, with output power, two channel gain differences are small, switching on and shutting down are raised one's voice
Device is without impulsive sound and reliable overheat overload short circuit protection.
6. musical instrument loudspeaker remote intelligent control system according to claim 1, it is characterised in that：TDA1521A both may be used
Powered with positive-negative power, it is also possible to which single supply is powered, during dual power supply, two audio output electric capacity, bass sound high can be saved
More preferably, when single supply is powered, power filtering capacitor should be close proximity to the power end of integrated circuit, to avoid circuit inside certainly for matter
Swash.
7. musical instrument loudspeaker remote intelligent control system according to claim 1, it is characterised in that：The bus system
Including data highway system and general line controlling system, the data highway system and general line controlling system are duplex channel systems
System.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710097570.0A CN106887223A (en) | 2017-02-22 | 2017-02-22 | A kind of musical instrument loudspeaker remote intelligent control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710097570.0A CN106887223A (en) | 2017-02-22 | 2017-02-22 | A kind of musical instrument loudspeaker remote intelligent control system |
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| Publication Number | Publication Date |
|---|---|
| CN106887223A true CN106887223A (en) | 2017-06-23 |
Family
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Family Applications (1)
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|---|---|---|---|
| CN201710097570.0A Pending CN106887223A (en) | 2017-02-22 | 2017-02-22 | A kind of musical instrument loudspeaker remote intelligent control system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110035356A (en) * | 2018-01-12 | 2019-07-19 | 达尔科技股份有限公司 | Stereo audio system and interlock circuit and method |
| US10499153B1 (en) | 2017-11-29 | 2019-12-03 | Boomcloud 360, Inc. | Enhanced virtual stereo reproduction for unmatched transaural loudspeaker systems |
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| CN2218425Y (en) * | 1994-05-11 | 1996-01-24 | 福州大学 | TV sound signal receiver |
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| CN106228966A (en) * | 2016-08-31 | 2016-12-14 | 熊周艺 | Intelligent musical instrument |
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2017
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| CN2218425Y (en) * | 1994-05-11 | 1996-01-24 | 福州大学 | TV sound signal receiver |
| CN1296372A (en) * | 1999-11-16 | 2001-05-23 | 林智文 | Audio frequency processing circuit |
| CN205657827U (en) * | 2016-01-19 | 2016-10-19 | 广东中南声像灯光设计研究院 | Intelligent high integration active audio amplifier |
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| Title |
|---|
| 佚名: "低音扬声器的低通滤波器电路", 《百度文库》 * |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10499153B1 (en) | 2017-11-29 | 2019-12-03 | Boomcloud 360, Inc. | Enhanced virtual stereo reproduction for unmatched transaural loudspeaker systems |
| TWI697895B (en) * | 2017-11-29 | 2020-07-01 | 美商博姆雲360公司 | Enhanced virtual stereo reproduction for unmatched transaural loudspeaker systems |
| US10951986B2 (en) | 2017-11-29 | 2021-03-16 | Boomcloud 360, Inc. | Enhanced virtual stereo reproduction for unmatched transaural loudspeaker systems |
| CN110035356A (en) * | 2018-01-12 | 2019-07-19 | 达尔科技股份有限公司 | Stereo audio system and interlock circuit and method |
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Application publication date: 20170623 |
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| RJ01 | Rejection of invention patent application after publication |