CN107948808A - Earphone and magnetic resonance system applied to magnetic resonance system - Google Patents
Earphone and magnetic resonance system applied to magnetic resonance system Download PDFInfo
- Publication number
- CN107948808A CN107948808A CN201810032411.7A CN201810032411A CN107948808A CN 107948808 A CN107948808 A CN 107948808A CN 201810032411 A CN201810032411 A CN 201810032411A CN 107948808 A CN107948808 A CN 107948808A
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- China
- Prior art keywords
- magnetic resonance
- circuit
- resonance system
- earphone
- power amplification
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/10—Earpieces; Attachments therefor ; Earphones; Monophonic headphones
- H04R1/1033—Cables or cables storage, e.g. cable reels
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2201/00—Details of transducers, loudspeakers or microphones covered by H04R1/00 but not provided for in any of its subgroups
- H04R2201/10—Details of earpieces, attachments therefor, earphones or monophonic headphones covered by H04R1/10 but not provided for in any of its subgroups
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Amplifiers (AREA)
Abstract
The invention discloses a kind of earphone and magnetic resonance system applied to magnetic resonance system.Earphone applied to magnetic resonance system includes amplifying circuit, for being amplified to the audio signal of input；And loudspeaker, be connected to the output terminal of the amplifying circuit, the amplifying circuit by analog circuit and or the loudspeaker be made of nonmagnetic substance.Therefore the electromagnetic interference brought when can be to avoid digital power amplifier driving load, the compatibility of the enhancing earphone and magnetic resonance equipment for being applied to magnetic resonance system, improves transaudient efficiency.
Description
Technical field
The present invention relates to appliance field, more particularly to a kind of earphone and magnetic resonance system applied to magnetic resonance system.
Background technology
When utilizing large medical equipment to patient into image scan or treatment, doctor and exchanging for patient are most important,
Therefore the earphone that patient worn would generally be given to be applied to magnetic resonance system, on the one hand can realize exchanging for doctor and patient, separately
On the one hand noise of the Medical Devices when being scanned or treating can also be weakened.And traditional ear applied to magnetic resonance system
Machine generally use electromagnetic type phonation unit.When magnetic resonance equipment works, the sounding of such earphone applied to magnetic resonance system
Magnetic element in unit can be influenced be subject to magnetic resonance equipment, the ear that this can be to magnetic resonance equipment and applied to magnetic resonance system
Machine interferes, therefore electromagnetic type generating unit can not use in magnetic resonance equipment.It is for this reason, big in traditional magnetic resonance equipment
Phonation unit, is both mounted remotely from the position of magnet, such as sick bed tail by more earphones for being applied to magnetic resonance system using conductance
End.Phonation unit is attached by tracheae and the earphone applied to magnetic resonance system, passes through the air vibration transmission in tracheae
Sound to applied to magnetic resonance system earphone.But the earphone that conductance is applied to magnetic resonance system would generally be due to by longer
Tracheae transmit sound, influenced by factors such as air tubing length, shape, materials, it is difficult to obtain preferable tonequality.And gas
Lead needs more powerful phonation unit could be in the earphone applied to magnetic resonance system applied to the earphone of magnetic resonance system
The problem of end obtains proper volume, this can cause transaudient efficiency low.
The content of the invention
Based on this, it is necessary to for the transaudient efficiency of the earphone applied to magnetic resonance system in traditional magnetic resonance equipment
A kind of the problem of low, lower tone, there is provided earphone applied to magnetic resonance system.
A kind of earphone applied to magnetic resonance system, including：
Amplifying circuit, for being amplified to the audio signal of input；And
Loudspeaker, is connected to the output terminal of the amplifying circuit, the amplifying circuit for analog circuit and or described raise one's voice
Device is made of nonmagnetic substance.
In one of the embodiments, the loudspeaker includes piezoelectric ceramic loudspeaker.
In one of the embodiments, the amplifying circuit includes voltage follower circuit and power amplification circuit, the electricity
Pressure follows the output terminal of circuit to be connected with the input terminal of the power amplification circuit, the output terminal connection of the power amplification circuit
In the loudspeaker.
In one of the embodiments, the amplifying circuit further includes capacitance C1.The capacitance C1 is connected to the voltage
Follow circuit.
In one of the embodiments, the power amplification circuit includes：
The first power amplification circuit and the second power amplification circuit of the voltage follower circuit output terminal are connected to, it is described
The output terminal of the output terminal of first power amplification circuit and second power amplification circuit is connected with the loudspeaker respectively.
In one of the embodiments, first power amplification circuit includes：
First power amplifier, the reverse input end of first power amplifier are defeated with first power amplifier
Outlet connects, and the positive input of first power amplifier is connected with the output terminal of the voltage follower circuit.
In one of the embodiments, second power amplification circuit includes：
Second power amplifier；
Resistance R3, is connected to the output terminal of the voltage follower circuit and the reverse input end of second power amplifier
Between；
Resistance R4, is connected to the output of the reverse input end and second power amplifier of second power amplifier
Between end.
In one of the embodiments, further include and be connected to first power amplification circuit, second power amplification
Conducting wire between circuit and the loudspeaker, the material of the conducting wire is carbon fiber.
A kind of magnetic resonance system, including：
The earphone applied to magnetic resonance system；
Magnet, including scanning through hole
Sick bed, the scanning through hole is passed in and out for delivering patient；
The amplifying circuit is arranged at the end face of the magnet, the inner wall of the scanning through hole or the sick bed.
In one of the embodiments, it is described so sick bed includes fixing bracket and the bed board that can be moved along fixing bracket
Amplifying circuit is arranged at the fixing bracket.
Earphone provided by the invention applied to magnetic resonance system includes amplifying circuit, loudspeaker.The amplifying circuit is used
It is amplified in the audio signal to input.The loudspeaker is connected to the output terminal of the amplifying circuit, the amplifying circuit
It is made of analog circuit and or described loudspeaker of nonmagnetic substance, therefore can be to avoid band during digital power amplifier driving load
The electromagnetic interference come, the compatibility of the enhancing earphone and magnetic resonance equipment for being applied to magnetic resonance system, improves transaudient efficiency.
Brief description of the drawings
Fig. 1 is the circuit diagram of the earphone provided in an embodiment of the present invention applied to magnetic resonance system.
Fig. 2 is another circuit diagram of the earphone provided in an embodiment of the present invention applied to magnetic resonance system.
Fig. 3 is the Headphone structure figure provided in an embodiment of the present invention applied to magnetic resonance system.
Fig. 4 is a kind of magnetic resonance system structure chart provided in an embodiment of the present invention.
Fig. 5 is a kind of magnetic resonance system another kind structure chart provided in an embodiment of the present invention.
Main element symbol description
Earphone 10 applied to magnetic resonance system
Amplifying circuit 100
Voltage follower circuit 110
Voltage follow operational amplifier 111
Power amplification circuit 200
First power amplification circuit 210
First power amplifier 211
Second power amplification circuit 220
Second power amplifier 221
Loudspeaker 300
Conducting wire 400
Current-limiting resistance 500
Sick bed 600
Fixing bracket 610
Bed board 620
Magnet 800
Scan through hole 810
Magnetic resonance system 20
Embodiment
In order to which goal of the invention, technical solution and the technique effect of the present invention is more clearly understood, below in conjunction with attached drawing pair
The specific embodiment of the present invention is described.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention,
It is not intended to limit the present invention.
Fig. 1 is referred to, the present invention provides a kind of earphone 10 applied to magnetic resonance system.It is described to be applied to magnetic resonance system
Earphone 10 include amplifying circuit 100, loudspeaker 300.The amplifying circuit 100 is used to put the audio signal of input
Greatly.The loudspeaker 300 is connected to the output terminal of the amplifying circuit 200.The amplifying circuit 100 for analog circuit and or
The loudspeaker is made of nonmagnetic substance.The audio signal can come from operation room.The doctor of operation room will can refer to
Audio signal is made to be transferred to patient by the earphone 10 applied to magnetic resonance system.In the process of the audio signal transmission
In, Gain tuning and noise reduction process can also be carried out to the audio signal.The power amplification circuit 200 is analog circuit
He or described loudspeakers using nonmagnetic substance be made can be to avoid digital power amplifier driving load when the electromagnetic interference brought, increase
The strong earphone 10 applied to magnetic resonance system and the compatibility of magnetic resonance equipment, improve transaudient efficiency.
In one of the embodiments, the amplifying circuit 100 includes voltage follower circuit 110 and power amplification circuit
200.The output terminal of the voltage follower circuit 110 is connected with the input terminal of the power amplification circuit 200, the power amplification
The output terminal of circuit 200 is connected to the loudspeaker 300.The power amplification circuit 200 is pure analog circuit.The voltage with
Audio signal can be received with circuit 100, and input impedance can be increased, reduce output impedance.The power amplification circuit 200 can
To amplify the audio signal.
Fig. 3 is referred to, the earphone applied to magnetic resonance system can include two loudspeakers 300.The loudspeaker
It can be connected successively with power amplification circuit 200, voltage follower circuit 100 respectively.Right part is applied to magnetic resonance system in figure
The Headphone structure of system is identical with left part.Described two loudspeakers 300 can be by connecting band connection.
In one of the embodiments, the loudspeaker 300 includes piezoelectric ceramic loudspeaker.The piezoelectric ceramic loudspeaker
For material nonmagnetic or without magnetic conductance.The piezoelectric ceramic loudspeaker will not be produced by the wind of the magnet absorption in magnetic resonance equipment
Danger, will not have an impact the normal work of magnetic resonance equipment.
In one of the embodiments, the amplifying circuit 100 further includes capacitance C1.The capacitance C1 is connected to the electricity
Pressure follows circuit 110.The capacitance C1 can filter direct current.
With continued reference to shown in Fig. 1, in one of the embodiments, the voltage follower circuit 110 is transported including voltage follow
Calculate amplifier 111, resistance R1, resistance R2.The resistance R1 is connected to the reverse input of the voltage follow operational amplifier 111
End.The resistance R2 is connected to the reverse input end of the voltage follow operational amplifier 111 and the voltage follow computing is put
Between the output terminal of big device 111.The positive input of the voltage follow operational amplifier 111 is connected to bias voltage VBias.
Ratio by adjusting the resistance R2 and the resistance R1 can change the voltage follow operational amplifier 111 to the sound
The amplification factor of frequency signal.In one of the embodiments, the voltage follow operational amplifier 111 to the audio signal into
Row 1:1 ratio enlargement.
In one of the embodiments, the voltage follower circuit 100 further includes capacitance C1.The capacitance C1 passes through described
Resistance R1 is connected to the reverse input end of the voltage follow operational amplifier 111.The capacitance C1 is used to input the audio
Signal.The capacitance C1 can filter the DC component in the audio signal.
In one of the embodiments, the power amplification circuit 200 includes the first power amplification circuit 210 and the second work(
Rate amplifying circuit 220.First power amplification circuit 210 and second power amplification circuit 220 are connected to the voltage
Follow 110 output terminal of circuit.The output terminal of first power amplification circuit 210 and second power amplification circuit 220
Output terminal is connected with the loudspeaker 300 respectively, is respectively used to positive amplification and reversely amplification.First power amplification circuit
210 and second power amplification circuit 220 audio signal can be amplified, then drive the loudspeaker 300
Make a sound.In one of the embodiments, first power amplification circuit 210 can be to the audio signal forward direction 1:1
Amplification.Second power amplification circuit 220 can reverse to the audio signal 1:1 amplification.The first power amplification electricity
Road 210 inputs positive voltage signal for the loudspeaker 300.Second power amplification circuit 220 inputs for the loudspeaker 300
Negative voltage signal.
In one of the embodiments, first power amplification circuit 210 includes the first power amplifier 211.It is described
The reverse input end of first power amplifier 211 is connected with the output terminal of first power amplifier 211.First power
The positive input of amplifier 211 is connected with the output terminal of the voltage follower circuit 110.First power amplifier 211
Can be to the audio signal forward direction 1:1 amplification.
Refering to what is shown in Fig. 2, in another embodiment, the reverse input end of first power amplifier 211 and described the
Resistance R5, R6 one end ground connection, first power amplifier 211 of termination can be connected between the output terminal of one power amplifier 211
Reverse input end.The output terminal of first power amplifier 211 can pass sequentially through the resistance R5 and resistance R6 and connect
Ground.Output voltage Vout=Vin* (R5+R6)/R6 of first power amplifier 211., can be with by the setting of R5 and R6
Amplification factor of first power amplifier 211 to the audio signal is adjusted, when needs 1:During 1 amplification, the value of R5 is zero.
In one of the embodiments, first power is can be used alone in the power amplification circuit 200 to put
Big device 211.When only using first power amplifier 211, the cathode of the loudspeaker 300 can connect first power
The output terminal of amplifier 211.The anode of the loudspeaker 300 can be grounded.
In one of the embodiments, first power amplifier 211 can also set resistance to adjust described first
The amplification factor of power amplifier 211.
In one of the embodiments, the reverse input end of first power amplifier 211 and first power are put
The resistance for adjusting 211 amplification factor of the first power amplifier can be connected between the output terminal of big device 211.
In one of the embodiments, second power amplification circuit 220 includes the second power amplifier 221, resistance
R3, resistance R4.The resistance R3 is connected to the output terminal of the voltage follower circuit 110 and second power amplifier 221
Reverse input end between.The resistance R4 is connected to the reverse input end and described second of second power amplifier 221
Between the output terminal of power amplifier 221.Second power amplifier 221 can reverse to the audio signal 1:1 amplification.
Ratio by adjusting the resistance R4 and resistance R3 can adjust second power amplifier 221 to the audio signal
Amplification factor.The positive input of second power amplifier 221 can also access the bias voltage VBias.Wherein
In one embodiment, second power amplifier 221 is can be used alone in the power amplification circuit 200.Only use
During second power amplifier 221, the anode of the loudspeaker 300 can connect the defeated of second power amplifier 221
Outlet.The anode of the loudspeaker 300 can be grounded.
In one of the embodiments, the earphone 10 applied to magnetic resonance system, which further includes, is connected to first work(
Conducting wire 400 between rate amplifying circuit 210, second power amplification circuit 220 and the loudspeaker 300.The conducting wire 400
Material be carbon fiber.The conducting wire 400 that carbon fiber makes can be to avoid plain conductor 400 to magnetic resonance equipment signal acquisition coil
Parameter impact, the interference signal that radiofrequency field, gradient fields produce on plain conductor 400 can also be avoided to audio signal
Produce interference.
In one of the embodiments, it is described to further include two current-limiting resistances 500.First power amplification circuit 210
Output terminal and the output terminal of second power amplification circuit 220 raised respectively by a current-limiting resistance 500 with described
Sound device 300 connects.The current-limiting resistance 500 can limit the size of electric current, the size of the current-limiting resistance 500 and conducting wire 400 with
And the driving power of loudspeaker 300 is related.
In one of the embodiments, the power amplification circuit 200 can be raised by way of wireless telecommunications with described
Sound device 300 connects.
The embodiment of the present invention provides a kind of magnetic resonance system 20.The magnetic resonance system 20 is total to including described applied to magnetic
Earphone 10, magnet 800, the sick bed 600 of vibrating system.The magnet 800 includes scanning through hole 810.The scanning through hole 810 is used for
Deliver patient's disengaging scanning through hole 810.The sick bed 600 is used to carry out magnetic resonance to the human body for entering the scanning through hole
Check.For delivering patient's disengaging scanning through hole 810.The amplifying circuit 100 can be arranged at the scanning through hole 810
Inner wall or the sick bed 600.Fig. 3 is referred to, in one of the embodiments, the amplifying circuit 100 can be arranged at disease
Bed 600.The amplifying circuit 100 can be moved together with sick bed, to improve work efficiency.In one of the embodiments, institute
The both ends of the sick bed 600 can be arranged at by stating amplifying circuit 100.Including head of a bed portion and tailstock portion.The amplifying circuit 100 is set
The space of the sick bed 600 can be made full use of by being placed in the head of a bed portion or the tailstock portion.
In one of the embodiments, the loudspeaker 300 can pass through the conducting wire 400 and the amplifying circuit 100
Connection.
In one of the embodiments, the sick bed 600 includes the fixing bracket 620 being fixedly installed relative to ground, with
And it is supported on the fixing bracket 610 and can be moved along the fixing bracket 610 to pass in and out the bed board of the scanning through hole 810
620.The amplifying circuit 100 is arranged on the fixing bracket 610 or the bed board 620.When the amplifying circuit 100 is set
When the fixing bracket 610, since the fixing bracket 610 will not be moved with the movement of bed board 620, so being put when described
When big circuit 100 be connected with loudspeaker 300 using conducting wire 400, avoid movement due to bed board 620 and so that bed board 620 and
Interfered between conducting wire 400.
In one of the embodiments, the outside of conducting wire 400 has protection pipe sleeve, for protecting conducting wire 400 or dust-proof.
Fig. 4 is referred to, in one of the embodiments, the amplifying circuit 100 can be arranged at the scanning through hole 810
Inner wall.The incorporating section for storing the conducting wire 400 can be provided with the scanning through hole 810 or on the sick bed 600.
The incorporating section can have the pivot structure for being used for winding the conducting wire 400.In one of the embodiments, the incorporating section
With the structure to fit with scanning 810 inner wall of through hole or sick bed 600.
In one of the embodiments, the current-limiting resistance 500 can be arranged at described together with the amplifying circuit 100
Sick bed 600 or the inner wall for scanning through hole, can also be set together with the loudspeaker 300.
It should be noted that when element is referred to as " being fixed on " another element, it can be directly on another element
Or there may also be element placed in the middle.When an element is considered as " connection " another element, it can be directly connected to
To another element or it may be simultaneously present centering elements.On the contrary, when element be referred to as " directly existing " another element " on " when,
There is no intermediary element.Term as used herein " vertically ", " horizontal ", "left", "right" and similar statement are
For illustrative purposes.
Embodiment described above only expresses the several embodiments of the present invention, its description is more specific and detailed, but simultaneously
Therefore the limitation to the scope of the claims of the present invention cannot be interpreted as.It should be pointed out that for those of ordinary skill in the art
For, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to the guarantor of the present invention
Protect scope.Therefore, the protection domain of patent of the present invention should be determined by the appended claims.
Claims (10)
- A kind of 1. earphone applied to magnetic resonance system, it is characterised in that including：Amplifying circuit (100), for being amplified to the audio signal of input；AndLoudspeaker (300), is connected to the output terminal of the amplifying circuit (200), the amplifying circuit for analog circuit and or institute Loudspeaker is stated to be made of nonmagnetic substance.
- 2. it is applied to the earphone of magnetic resonance system as claimed in claim 1, it is characterised in that the loudspeaker (300) includes Piezoelectric ceramic loudspeaker.
- 3. it is applied to the earphone of magnetic resonance system as claimed in claim 1, it is characterised in that amplifying circuit (100) bag Include voltage follower circuit (110) and power amplification circuit (200), output terminal and the work(of the voltage follower circuit (110) The input terminal connection of rate amplifying circuit (200), the output terminal of the power amplification circuit (200) are connected to the loudspeaker (300)。
- 4. it is applied to the earphone of magnetic resonance system as claimed in claim 3, it is characterised in that the amplifying circuit (100) is also Including capacitance C1, the capacitance C1 is connected to the voltage follower circuit (110).
- 5. it is applied to the earphone of magnetic resonance system as claimed in claim 3, it is characterised in that the power amplification circuit (200) include：It is connected to first power amplification circuit (210) and the second power amplification electricity of the voltage follower circuit (110) output terminal Road (220), the output terminal of first power amplification circuit (210) and the output terminal of second power amplification circuit (220) It is connected respectively with the loudspeaker (300).
- 6. it is applied to the earphone of magnetic resonance system as claimed in claim 5, it is characterised in that first power amplification circuit (210) include：First power amplifier (211), reverse input end and first power amplification of first power amplifier (211) The output terminal connection of device (211), positive input and the voltage follower circuit of first power amplifier (211) (110) output terminal connection.
- 7. it is applied to the earphone of magnetic resonance system as claimed in claim 5, it is characterised in that second power amplification circuit (220) include：Second power amplifier (221)；Resistance R3, be connected to the voltage follower circuit (110) output terminal and second power amplifier (221) it is reverse Between input terminal；Resistance R4, is connected to the reverse input end and second power amplifier (221) of second power amplifier (221) Output terminal between.
- 8. it is applied to the earphone of magnetic resonance system as claimed in claim 5, it is characterised in that further include and be connected to described first Conducting wire (400) between power amplification circuit (210), second power amplification circuit (220) and the loudspeaker (300), The material of the conducting wire (400) is carbon fiber.
- A kind of 9. magnetic resonance system, it is characterised in that including：Claim 1-8 any one of them is applied to the earphone (10) of magnetic resonance system；Magnet (800), including scanning through hole (810)Sick bed (600), for delivering patient's disengaging scanning through hole (810)；The amplifying circuit (100) is arranged at the end face of the magnet (800), the inner wall or described of the scanning through hole (810) Sick bed (600).
- 10. magnetic resonance system as claimed in claim 9, it is characterised in that so sick bed (600) includes fixing bracket (610) With the fixing bracket (610) can be arranged at along the bed board (620) that fixing bracket moves, the amplifying circuit (100).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810032411.7A CN107948808A (en) | 2018-01-12 | 2018-01-12 | Earphone and magnetic resonance system applied to magnetic resonance system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810032411.7A CN107948808A (en) | 2018-01-12 | 2018-01-12 | Earphone and magnetic resonance system applied to magnetic resonance system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107948808A true CN107948808A (en) | 2018-04-20 |
Family
ID=61938599
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810032411.7A Pending CN107948808A (en) | 2018-01-12 | 2018-01-12 | Earphone and magnetic resonance system applied to magnetic resonance system |
Country Status (1)
| Country | Link |
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| CN (1) | CN107948808A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110267137A (en) * | 2019-05-27 | 2019-09-20 | 上海联影医疗科技有限公司 | Transmission equipment and medical system |
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| US5277184A (en) * | 1992-09-30 | 1994-01-11 | Messana Russell C | MRI sound system transducer and headset |
| US20010043652A1 (en) * | 1995-03-31 | 2001-11-22 | Anthony Hooley | Digital pulse-width-modulation generator |
| CN1384603A (en) * | 2001-04-28 | 2002-12-11 | 凌阳科技股份有限公司 | Switchable voltage follower and bridge driving circuit unit with the follower |
| CN104519447A (en) * | 2013-10-08 | 2015-04-15 | 三星电子株式会社 | Apparatus and method of reducing noise and audio playing apparatus with non-magnet speaker |
| CN105122837A (en) * | 2013-04-19 | 2015-12-02 | 三星电子株式会社 | Headset to provide noise reduction |
| CN107320104A (en) * | 2017-07-19 | 2017-11-07 | 深圳市贝优通新能源技术开发有限公司 | A kind of observation reliable NMR based on Internet of Things |
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2018
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5277184A (en) * | 1992-09-30 | 1994-01-11 | Messana Russell C | MRI sound system transducer and headset |
| US20010043652A1 (en) * | 1995-03-31 | 2001-11-22 | Anthony Hooley | Digital pulse-width-modulation generator |
| CN1384603A (en) * | 2001-04-28 | 2002-12-11 | 凌阳科技股份有限公司 | Switchable voltage follower and bridge driving circuit unit with the follower |
| CN105122837A (en) * | 2013-04-19 | 2015-12-02 | 三星电子株式会社 | Headset to provide noise reduction |
| CN104519447A (en) * | 2013-10-08 | 2015-04-15 | 三星电子株式会社 | Apparatus and method of reducing noise and audio playing apparatus with non-magnet speaker |
| CN107320104A (en) * | 2017-07-19 | 2017-11-07 | 深圳市贝优通新能源技术开发有限公司 | A kind of observation reliable NMR based on Internet of Things |
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| CN110267137A (en) * | 2019-05-27 | 2019-09-20 | 上海联影医疗科技有限公司 | Transmission equipment and medical system |
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Application publication date: 20180420 |
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