CN113132860B - Circuit and system for resisting noise of ground loop and unbalanced audio equipment - Google Patents
Circuit and system for resisting noise of ground loop and unbalanced audio equipment Download PDFInfo
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- H04R3/02—Circuits for transducers, loudspeakers or microphones for preventing acoustic reaction, i.e. acoustic oscillatory feedback
Abstract
The anti ground return circuit noise circuit, system and unbalanced audio equipment that this application embodiment provided are applied to unbalanced audio equipment, include: the positive input end of the differential amplification circuit is connected with a signal end in an audio interface, the negative input end of the differential amplification circuit is connected with a grounding end in the audio interface, the audio interface is an input interface of the audio equipment, and the differential amplification circuit is used for amplifying a differential audio signal sent by source-end audio equipment and suppressing ground loop noise. In the embodiment of the application, the ground isolation between the two audio devices is realized from the hardware design perspective, and the balanced and unbalanced output ports of the source audio device are compatible, so that no additional adaptation is needed. By adopting the technical scheme, the design of field wiring is greatly simplified, and the quality of audio signals and the stability of an audio system are improved.
Description
Technical Field
The present application relates to the field of circuit technology, and in particular, to an anti-ground loop noise circuit, system and unbalanced audio device.
Background
In current audio systems, ground loop noise generally exists, and the ground loop noise refers to current noise generated on a connecting line of two devices due to a potential difference generated between the two devices caused by different ground impedances of the two devices, and affects transmission of audio signals.
For an unbalanced audio system, the prior art provides two ways of resisting ground loop noise, one is to isolate the ground of a source end device and a receiving end device by using an audio isolator; and the other type only reserves the grounding wire on one device and disconnects the grounding wires of the other devices.
However, in the above method, the audio isolator is not suitable for all unbalanced audio devices, and the audio isolator may reduce the quality of the audio signal, and in addition, the disconnection of the ground wire of the device may cause safety risk.
Disclosure of Invention
The application provides an anti-ground loop noise circuit, an anti-ground loop noise system and unbalanced audio equipment, so that ground isolation between the two audio equipment is realized.
In a first aspect, an anti-ground loop noise circuit provided in an embodiment of the present application is applied to an unbalanced audio device, and includes: a differential amplifier circuit;
the positive input end of the differential amplifier circuit is connected with a signal end in an audio interface, the negative input end of the differential amplifier circuit is connected with a grounding end in the audio interface, and the audio interface is an input interface of the unbalanced audio equipment;
the differential amplification circuit is used for amplifying differential audio signals sent by the audio equipment at the source end and suppressing noise of a grounding loop.
In one possible design, the ground loop noise immunity circuit further includes:
and one end of the grounding resistor is connected with a grounding end in the audio interface, and the other end of the grounding resistor is grounded.
In one possible design, the differential amplification circuit includes an operational amplifier.
In one possible design, the audio device is a terminal device.
In one possible design, the resistance of the ground resistor is less than 20 ohms.
In one possible design, the ground loop noise immunity circuit further includes:
and the input end of the analog-to-digital converter is connected with the output end of the differential amplification circuit.
In one possible design, the audio denoising device further includes:
and the digital processor is connected with the analog-to-digital converter and is used for processing the audio signal after analog-to-digital conversion.
In a second aspect, an embodiment of the present application provides an audio device: comprising an anti-ground loop noise circuit as described in the first aspect.
In a third aspect, an anti-ground loop noise system provided in an embodiment of the present application: the device comprises a source end audio device and a receiving end audio device;
the sink audio device comprises the audio device of the third aspect;
the source audio device is configured to send an audio signal to the sink audio device.
The anti ground return circuit noise circuit, system and unbalanced audio equipment that this application embodiment provided are applied to unbalanced audio equipment, include: the positive input end of the differential amplification circuit is connected with a signal end in an audio interface, the negative input end of the differential amplification circuit is connected with a grounding end in the audio interface, the audio interface is an input interface of the audio equipment, and the differential amplification circuit is used for amplifying a differential audio signal sent by source-end audio equipment and suppressing ground loop noise. In the embodiment of the application, the ground isolation between the two audio devices is realized from the hardware design perspective, and the balanced and unbalanced output ports of the source audio device are compatible, so that no additional adaptation is needed. By adopting the technical scheme, the design of field wiring is greatly simplified, and the quality of audio signals and the stability of an audio system are improved.
Drawings
Fig. 1 is a schematic structural diagram of an audio system according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of a conventional ground loop noise rejection system according to an embodiment of the present application;
fig. 3 is a schematic structural diagram of a ground loop noise immunity circuit according to an embodiment of the present disclosure;
fig. 4 is a schematic structural diagram of an anti-ground loop noise circuit according to another embodiment of the present disclosure;
fig. 5 is a schematic structural diagram of an anti-ground loop noise circuit according to another embodiment of the present application;
fig. 6 is a schematic structural diagram of a system for resisting ground loop noise according to an embodiment of the present disclosure.
With the above figures, there are shown specific embodiments of the present application, which will be described in more detail below. These drawings and written description are not intended to limit the scope of the inventive concepts in any manner, but rather to illustrate the inventive concepts to those skilled in the art by reference to specific embodiments.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.
The terms "comprising" and "having," and any variations thereof, in the description and claims of this application and the drawings described herein are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus.
The terms "first," "second," "third," "fourth," and the like in the description and in the claims of the present application and in the drawings described above, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order.
In addition, in the present application, unless otherwise explicitly specified or limited, the terms "connected" and the like are to be understood in a broad sense, and may be, for example, mechanically or electrically connected; the terms may be directly connected or indirectly connected through an intermediate medium, and may be used for communicating between two elements or for interacting between two elements, unless otherwise specifically defined, and the specific meaning of the terms in the present application may be understood by those skilled in the art according to specific situations.
The nouns and application scenarios to which this application refers will be first introduced.
Ground loop noise: the audio equipment powered by the mains supply generates potential difference between the two equipment due to inconsistent grounding impedance, thereby generating noise on a grounding loop.
Anti-ground loop noise: a method for eliminating or circumventing ground loop noise.
Differential mode signal: equal amplitude, opposite phase signals.
Common mode signal: equal amplitude, equal phase signals.
A differential amplifier circuit: the amplifier circuit is also called a differential amplifier circuit and is used for amplifying differential mode signals and inhibiting common mode signals.
Unbalanced audio systems: from source audio equipment to cable to terminal audio equipment, an unbalanced system is provided as long as there is a section that does not carry differential mode signals.
In the existing unbalanced audio system, the problem of ground loop noise generally exists, generally, two audio devices are connected through one audio line, even if a source audio device is muted, a receiving audio device can hear 'nourishing' current noise, and the audio line between the two audio devices is unplugged, so that no noise exists, which is because the ground impedances of the two audio devices are different, so that a potential difference is generated between the two audio devices, and thus current noise is generated on the audio line connected with the audio devices.
Fig. 1 is a schematic structural diagram of an audio system according to an embodiment of the present invention, and as shown in fig. 1, a conventional audio system 10 includes:
audio device 11 and audio device 12, wherein the ground impedance of audio device 11 is different from that of audio device 12, for example: the ground impedance of the audio device 11 is 10 ohms, the ground impedance of the audio device 12 is 1 ohm, the audio device 11 and the audio device 12 are connected through the audio line 13, after the power is turned on, a potential difference exists between the audio device 11 and the audio device 12, so that a part of current is transmitted from the audio device 11 to the audio device 12 through the audio line 13, and flows back to the ground through a ground line of the audio device 12, so that common mode noise, namely ground loop noise, is generated on the audio line 13.
It should be noted that the audio device 11 and the audio device 12 in the embodiment of the present application may be devices with audio functions, such as a sound console, an equalizer, a power amplifier, and an effector, which are not limited to this, and as long as there is ground loop noise between the audio devices, the noise can be eliminated by using the technical solution.
At present, two ground loop noise resisting modes are provided for an unbalanced audio system, one mode is to adopt an audio isolator to isolate the ground of a source end device and a receiving end device, however, because the input end and the output end of a plurality of products on the market are not designed in a standard way, the audio isolator can fail, the frequency response curve of the audio isolator can hardly reach the whole frequency band, most of the products only reserve a voice part, audio signals have certain loss, and nonlinear distortion can be brought; the other method only keeps the grounding wire on one device and disconnects the grounding wires of the other devices, but the safety risk is generated. Therefore, for the ground loop noise, no simple and easy-to-use anti-ground loop noise solution is available for the unbalanced audio system, and field engineering debugging with certain workload is required.
A scheme for preventing ground loop noise in an unbalanced audio system is described in detail below with reference to the embodiment of fig. 2.
Fig. 2 is a schematic structural diagram of a conventional anti-ground loop noise system according to an embodiment of the present invention, and as shown in fig. 2, the conventional anti-ground loop noise system 20 includes:
audio device 11, audio device 12, audio line 13, audio isolator 14.
Wherein, audio equipment 11 is connected with audio isolator 14 through audio line 13, and audio equipment 12 is connected with audio isolator 14 through audio line 13, and audio isolator 14 keeps apart audio equipment 11 with audio equipment 12's ground, avoids altogether.
The audio isolator 14 essentially uses two audio isolation transformers to isolate the grounds of the two devices, thereby avoiding common ground. The operating frequency range of the audio isolator 14 is typically from 10Hz to 20 KHz. The device is mainly used for audio signal transmission between systems or equipment, can completely isolate the potential difference between the two systems, avoids hum interference caused by grounding problems, prevents the damage of overhigh potential difference to the input stage of the equipment, and realizes the safe transmission of audio signals, which is a necessary product for audio system cascade connection.
To solve the problems in the prior art, an embodiment of the present application provides an anti-ground loop noise circuit, including: the positive input end of the differential amplification circuit is connected with a signal end in an audio interface, the negative input end of the differential amplification circuit is connected with a grounding end in the audio interface, the audio interface is an input interface of the audio equipment, and the differential amplification circuit is used for amplifying a differential audio signal sent by source-end audio equipment and suppressing ground loop noise. Therefore, the ground isolation between the two audio devices is realized from the hardware design perspective, and the balanced and unbalanced output ports of the source audio device are compatible, so that additional adaptation is not needed. By adopting the technical scheme, the design of field wiring is greatly simplified, and the quality of audio signals and the stability of an audio system are improved.
The technical solution of the present application will be described in detail below with specific examples. The following several specific embodiments may be combined with each other, and details of the same or similar concepts or processes may not be repeated in some embodiments.
Fig. 3 is a schematic structural diagram of an anti-ground loop noise circuit according to an embodiment of the present application, and as shown in fig. 3, the anti-ground loop noise circuit 30 includes: and a differential amplifier circuit 31.
The positive (+) input end of the differential amplifier circuit 31 is connected to the signal terminal 1 of the audio interface 32, the negative (-) input end of the differential amplifier circuit 31 is connected to the ground terminal 2 of the audio interface 32, and the audio interface 32 is an input interface of the receiving-end audio device 12.
The differential amplifier circuit 31 is configured to amplify a differential audio signal sent by a source audio device, and suppress ground loop noise.
The differential amplifier circuit 31 is a circuit having the characteristics of suppressing common mode signals and amplifying differential mode signals, the input end of the differential amplifier circuit 31 is the input of two signals, the difference between the two signals is an effective input signal of the circuit, the output of the differential amplifier circuit 31 is the amplification of the difference between the two input signals, since the ground loop noise is the common mode noise, the input of the differential amplifier circuit is the difference between the two signals after the input of the differential amplifier circuit is the common mode noise, that is, the difference is 0, the effect of resisting common mode interference is achieved, correspondingly, since the audio signal is the differential mode signal, after the input of the differential amplifier circuit is the difference between the two signals, that is, the effect of amplifying the differential mode signal is achieved.
In this embodiment, the audio device 12 is a sink audio device, and when the sink audio device 12 receives an audio signal, the quality of the differential audio signal may be affected due to the ground loop noise, for example, current noise is doped in the audio signal, or even if the source audio device is muted and does not transmit the audio signal, the sink audio device may also have the ground loop noise. Therefore, the differential audio signal can be amplified and the ground loop noise can be suppressed by using the differential amplification circuit.
It should be noted that after receiving the audio signal sent by the source audio device through the input interface of the audio device 12, the audio signal may also be subjected to filtering processing and amplification processing.
The circuit for resisting the noise of the ground loop provided by the embodiment is applied to unbalanced audio equipment and comprises: the positive input end of the differential amplification circuit is connected with a signal end in an audio interface, the negative input end of the differential amplification circuit is connected with a grounding end in the audio interface, the audio interface is an input interface of the audio equipment, and the differential amplification circuit is used for amplifying a differential audio signal sent by source-end audio equipment and suppressing ground loop noise. Therefore, the ground isolation between the two audio devices is realized from the hardware design perspective, and the balanced and unbalanced output ports of the source audio device are compatible, so that additional adaptation is not needed. By adopting the technical scheme, the design of field wiring is greatly simplified, and the quality of audio signals and the stability of an audio system are improved.
On the basis of the above-described embodiments, after two audio devices are connected by an audio line, electromagnetic noise may be generated, which is caused by the ungrounded or poorly grounded device, and generally appears as interference noise of 50Hz, 150Hz, 250Hz, etc. in terms of waveform, and the power is high, and may completely cover the audio signal. This is explained in detail below with reference to the embodiment of fig. 4.
Fig. 4 is a schematic structural diagram of an anti-ground loop noise circuit according to another embodiment of the present application, and as shown in fig. 4, the anti-ground loop noise circuit 30 further includes: a ground resistor 33.
The positive input end of the differential amplifier circuit 31 is connected to a signal end in the audio interface 32, the negative input end of the differential amplifier circuit 31 is connected to a ground end in the audio interface 32, the audio interface 32 is an input interface of the audio device 12, and the differential amplifier circuit 31 is configured to amplify a differential audio signal sent by a source audio device and suppress ground loop noise.
One end of the ground resistor 33 is connected to the ground terminal of the audio interface 32, and the other end is grounded.
It is worth to be noted that the electromagnetic noise is essentially noise generated by static electricity generated by the operation of the audio equipment which cannot be released under the condition that the audio equipment is not grounded or suspended, and the static electricity flows between the two audio equipment through the audio line.
In one possible design, audio device 12 is a terminal device.
Illustratively, when an audio signal is received through the audio line, the generated static electricity generates electromagnetic noise on the audio line, thereby affecting the quality of the audio signal, because the terminal device is not grounded, and when the terminal device is charged, the electromagnetic noise is not generated because the terminal device is grounded through the charging line.
Alternatively, when neither the audio device 11 nor the audio device 12 is grounded, significant electromagnetic noise is generated, which affects the transmission of the audio signal.
In this embodiment, in order to eliminate electromagnetic noise, it is required that the audio device must be well grounded, and for a terminal device without ground, for example: when a mobile phone, a computer and the like are connected with equipment, a cable used for connecting the equipment must be well grounded, so that electromagnetic noise generated by the equipment can be released through grounding.
It should be noted that, in the present embodiment, if only the audio device is grounded, a ground loop as shown in fig. 1 is formed, and ground loop noise is generated, so that the ground resistance is adopted to release electromagnetic noise, thereby improving the transmission quality of the audio signal.
In a possible design, the resistance value of the ground resistor is less than 20 ohms, for example, 10 ohms, and the resistance value of the ground resistor is determined according to actual conditions, which is not limited in this embodiment.
In one possible design, the differential amplification circuit 31 includes an operational amplifier.
It should be noted that the differential amplifier circuit 31 in this embodiment has various topologies and various types of operational amplifiers, and this embodiment does not limit the topologies of the differential amplifier circuit and the types of the operational amplifiers.
In one possible design, the audio denoising device 30 further includes:
and an analog-to-digital converter 34, an input end of the analog-to-digital converter 34 being connected to an output end of the differential amplifying circuit 31, and configured to convert a received analog audio signal into a digital audio signal.
In one possible design, the anti-ground loop noise circuit 30 further includes:
and the digital processor 35, wherein the digital processor 35 is connected with the analog-to-digital converter 34 and is used for processing the audio signal after analog-to-digital conversion.
Illustratively, the digital processor 35 may perform digital signal processing on the audio signal passing through the analog-to-digital converter, such as: noise reduction processing, echo suppression processing, etc., and the specific implementation of digital processing is similar to that of digital processing in the prior art, and is not described herein again.
The processed audio signal may then be sent to an output of the audio device after being processed by the digital processor 35, for example: a speaker, a receiver; alternatively, the audio signal may be transmitted to another receiving-end audio device through an audio line.
The circuit for resisting the noise of the ground loop provided by the embodiment is applied to unbalanced audio equipment and comprises: the audio interface is an input interface of the audio equipment, the differential amplifier circuit is used for amplifying a differential audio signal sent by the audio equipment at a source end and suppressing ground loop noise, one end of the ground resistor is connected with the ground terminal in the audio interface, and the other end of the ground resistor is grounded. The ground isolation between the two audio devices is realized from the hardware design angle, and the balanced and unbalanced output ports of the audio devices at the source end are compatible, so that additional adaptation is not needed, the design of field wiring is simplified, and the stability of an audio system is improved; and the transmission quality of the audio signal can be improved by eliminating the electromagnetic noise through the grounding resistor.
On the basis of the above embodiments, the present solution is explained below by a specific embodiment.
Fig. 5 is a schematic structural diagram of an anti-ground loop noise circuit according to another embodiment of the present application, and as shown in fig. 5, the anti-ground loop noise circuit 30 includes: a differential amplifying circuit 31, a grounding resistor 33, an analog-to-digital converter 34 and a digital processor 35.
The differential amplifier circuit 31 includes an operational amplifier 311, a positive input terminal of the operational amplifier 311 is connected to the signal terminal 1 in the audio interface 32, a negative input terminal of the operational amplifier 311 is connected to the ground terminal 2 in the audio interface 32, and the audio interface 32 is an input interface of the audio device 12.
It should be noted that the differential amplifier circuit 31 in this embodiment has various topologies, and the type of the operational amplifier 311 also has various types, and this embodiment does not limit the topology of the differential amplifier circuit 31 and the type of the operational amplifier 311.
One end of the ground resistor 33 is connected to the ground terminal of the audio interface 32, and the other end is grounded.
The input end of the analog-to-digital converter 34 is connected to the output end of the differential amplifying circuit 31, and is configured to convert the received analog audio signal into a digital audio signal.
The digital processor 35 is connected to the analog-to-digital converter 34, and is configured to process the analog-to-digital converted audio signal.
As shown in fig. 5, the differential amplifier provided in this embodiment includes four resistors, which are R1, R2, R3, and R4, and the specific description of the differential amplifier is similar to that in the prior art, and is not repeated herein.
It should be noted that the differential amplifier circuit provided in this embodiment is only an exemplary one, and in practical applications, the differential amplifier circuit includes, but is not limited to, the differential amplifier circuit in this embodiment.
The anti-ground loop noise circuit provided by the embodiment is applied to audio equipment and comprises: the positive input end of the differential amplification circuit is connected with a signal end in an audio interface, the negative input end of the differential amplification circuit is connected with a grounding end in the audio interface, the audio interface is an input interface of the audio equipment, and the differential amplification circuit is used for amplifying a differential audio signal sent by source-end audio equipment and suppressing ground loop noise. Therefore, the ground isolation between the two audio devices is realized from the hardware design angle, the balanced and unbalanced output ports of the audio devices at the source ends are compatible, additional adaptation is not needed, the design of field wiring is simplified, and the stability of an audio system is improved; and the transmission quality of the audio signal can be improved by eliminating the electromagnetic noise through the grounding resistor.
The embodiment of the present application further provides an audio device, which includes the circuit 30 for resisting the ground loop noise according to the above embodiment.
Fig. 6 is a schematic structural diagram of an anti-ground loop noise system according to an embodiment of the present application, and as shown in fig. 6, the anti-ground loop noise system 60 includes: a source audio device 61 and a sink audio device 62, where the sink audio device 62 includes the audio devices described in the above embodiments;
the source audio device 61 is configured to send an audio signal to the sink audio device 62.
Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the application being indicated by the following claims.
It will be understood that the present application is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the application is limited only by the appended claims.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.
Claims (8)
1. An anti-ground loop noise circuit for an unbalanced audio device, comprising: a differential amplifier circuit;
the positive input end of the differential amplifier circuit is connected with a signal end in an audio interface, the negative input end of the differential amplifier circuit is connected with a grounding end in the audio interface, and the audio interface is an input interface of the unbalanced audio equipment;
the differential amplification circuit is used for amplifying a differential audio signal sent by the source-end audio equipment and suppressing the noise of a grounding loop;
the anti-ground loop noise circuit further comprises:
one end of the grounding resistor is connected with a grounding end in the audio interface, and the other end of the grounding resistor is grounded; the grounding resistor is used for eliminating electromagnetic noise.
2. The circuit of claim 1, wherein the differential amplification circuit comprises an operational amplifier.
3. The circuit of claim 1, wherein the unbalanced audio device is a terminal device.
4. The circuit of claim 1, wherein the resistance of the ground resistor is less than 20 ohms.
5. The circuit of claim 1, wherein the anti-ground loop noise circuit further comprises:
and the input end of the analog-to-digital converter is connected with the output end of the differential amplification circuit.
6. The circuit of claim 5, wherein the anti-ground loop noise circuit further comprises:
and the digital processor is connected with the analog-to-digital converter and is used for processing the audio signal after analog-to-digital conversion.
7. An unbalanced audio device, comprising an anti-ground loop noise circuit as claimed in any one of claims 1 to 6.
8. An anti-ground loop noise system comprising a source audio device and a sink audio device, the sink audio device being the unbalanced audio device of claim 7;
the source audio device is configured to send an audio signal to the sink audio device.
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| CN201911391891.7A CN113132860B (en) | 2019-12-30 | 2019-12-30 | Circuit and system for resisting noise of ground loop and unbalanced audio equipment |
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| CN201911391891.7A CN113132860B (en) | 2019-12-30 | 2019-12-30 | Circuit and system for resisting noise of ground loop and unbalanced audio equipment |
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| CN114598558B (en) * | 2022-03-28 | 2023-10-31 | 厦门亿联网络技术股份有限公司 | Cascade self-repairing system and self-repairing method for audio equipment |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4258329A (en) * | 1978-03-22 | 1981-03-24 | Pioneer Electronic Corporation | Noise suppression system |
| CN104683922A (en) * | 2015-03-04 | 2015-06-03 | 青岛歌尔声学科技有限公司 | Ground-loop noise suppression system and method for earphones |
| CN104703097A (en) * | 2015-03-04 | 2015-06-10 | 青岛歌尔声学科技有限公司 | Audio ground loop noise inhibiting system and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5921533Y2 (en) * | 1979-04-11 | 1984-06-26 | パイオニア株式会社 | Automotive audio equipment |
| US9099967B2 (en) * | 2012-09-28 | 2015-08-04 | Apple Inc. | Increasing ground noise rejection in audio systems |
| CN107770682A (en) * | 2016-08-22 | 2018-03-06 | 孙贵群 | A kind of circuit for suppressing audio POP sound caused by single-ended differential signal superposition |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4258329A (en) * | 1978-03-22 | 1981-03-24 | Pioneer Electronic Corporation | Noise suppression system |
| CN104683922A (en) * | 2015-03-04 | 2015-06-03 | 青岛歌尔声学科技有限公司 | Ground-loop noise suppression system and method for earphones |
| CN104703097A (en) * | 2015-03-04 | 2015-06-10 | 青岛歌尔声学科技有限公司 | Audio ground loop noise inhibiting system and method |
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