CN218830591U

CN218830591U - TDD noise elimination circuit, TWS bluetooth headset and wireless communication device

Info

Publication number: CN218830591U
Application number: CN202222581656.XU
Authority: CN
Inventors: 罗恒
Original assignee: Shenzhen 3Nod Digital Technology Co Ltd
Current assignee: Shenzhen 3Nod Digital Technology Co Ltd
Priority date: 2022-09-28
Filing date: 2022-09-28
Publication date: 2023-04-07
Anticipated expiration: 2032-09-28

Abstract

The embodiment of the application belongs to the technical field of audio noise reduction, and relates to a TDD noise elimination circuit, which comprises a loudspeaker assembly, a battery, a noise elimination assembly and an antenna; the loudspeaker assembly is connected with the battery through inductive coupling; the battery is connected with the noise elimination component in series in an inverted mode and is used for providing working current for the circuit; the noise elimination component is connected with the antenna through inductive coupling and is used for generating reverse induced current to counteract the induced current generated by the antenna coupling; the antenna is connected with the communication equipment through a wireless signal and used for transmitting the communication signal of the communication equipment to the loudspeaker component; this application is through setting up the noise elimination subassembly, establishes ties with the battery inverting phase, at antenna radiant energy to noise elimination subassembly, produces the induced-current opposite with the battery, and positive and negative cancellation to, protect user's hearing simultaneously. The application also relates to a TWS Bluetooth headset and a wireless communication device. The technical scheme provided by the application can eliminate TDD noise, avoid communication from being interfered and improve audio quality.

Description

TDD noise elimination circuit, TWS bluetooth headset and wireless communication device

Technical Field

The present application relates to the field of audio noise reduction technologies, and in particular, to a TDD noise canceling circuit, a TWS bluetooth headset, and a wireless communication apparatus.

Background

With the continuous development of the consumer market of electronic products, more and more people in daily life listen to high-quality music by using earphones. However, noise pollution in cities is more serious, and ordinary earphone earplugs used outdoors can only increase the sound volume to cover the noise, so that the ordinary earphones cannot enjoy delicate music and have great influence on the hearing of the ordinary earphones.

At present, a Bluetooth-based true wireless earphone omits wired connection, is small in size, light in weight, convenient to carry and use, is suitable for various living scenes and mobile phones without earphone jacks, and becomes a hot-chasing object in the market. Referring to fig. 1, in the conventional TWS (True Wireless Stereo) bluetooth headset technology, a speaker 10, an antenna 20, a battery 30 and a PCB (not shown in the figure) need to be embedded in the headset, and the volume of the headset is small, so that the four components are often stacked together, at this Time, since the speaker 10 is an electromagnetic component, the antenna 20 is an electromagnetic radiation device, and radiates electromagnetic waves of 2.4G TDD (Time Division duplex), and a negative pole of the battery is an inductance winding, which belongs to a susceptible device, and a BUCK inductance is also present on the PCB. They are close to each other and there is electromagnetic coupling between them, thus generating electromagnetic interference, interfering with communication, causing audio quality degradation, and also affecting user's hearing.

SUMMERY OF THE UTILITY MODEL

The technical problem that this application embodiment will solve is that the inside noise interference that produces of earphone among the correlation technique, interference communication leads to the audio quality to reduce, influences user's hearing simultaneously.

In order to solve the foregoing technical problem, an embodiment of the present application provides a TDD noise canceling circuit, which adopts the following technical solutions:

a speaker assembly, a battery, a noise cancellation assembly, and an antenna;

the speaker assembly is connected to the battery via inductive coupling;

the battery is connected with the noise elimination assembly in an inverted series mode and used for providing working current for a circuit;

the noise elimination assembly is connected with the antenna through inductive coupling and used for generating reverse induction current to counteract induction current generated by the antenna coupling;

the antenna is connected with the communication equipment through wireless signals and used for transmitting the communication signals of the communication equipment to the loudspeaker assembly.

Further, the battery comprises a battery main body and an equivalent inductor, wherein the positive electrode of the battery main body is connected with the first end of the equivalent inductor, and the negative electrode of the battery main body is connected with the first end of the noise elimination assembly; and the second end of the equivalent inductor is connected with the second end of the noise elimination component.

Further, the noise elimination component comprises an inductance winding, a first end of the inductance winding is a first end of the noise elimination component, and a second end of the inductance winding is a second end of the noise elimination component.

Further, the inductance winding is arranged on the circuit board.

Furthermore, the circuit further comprises a load resistor, wherein a first end of the load resistor is connected with a first end of the inductance winding, and a second end of the load resistor is connected with the negative electrode of the battery main body.

Further, the antenna is arranged on the flexible circuit board.

Furthermore, the circuit further comprises a filter capacitor, wherein a first end of the filter capacitor is connected with the antenna, and a second end of the filter capacitor is grounded.

Further, the battery is a lithium battery.

In order to solve the above technical problem, an embodiment of the present application further provides a TWS bluetooth headset, including the TDD noise canceling circuit as described above.

In order to solve the above technical problem, an embodiment of the present application further provides a wireless communication apparatus, including a communication device and the TWS bluetooth headset as described above;

and the TWS Bluetooth headset is in communication connection with the communication equipment through wireless signals.

Compared with the prior art, the embodiment of the application mainly has the following beneficial effects:

the TDD noise elimination circuit comprises a loudspeaker assembly, a battery, a noise elimination assembly and an antenna; the loudspeaker assembly is connected with the battery through inductive coupling; the battery is connected with the noise elimination component in series in an inverted mode and is used for providing working current for the circuit; the noise elimination assembly is connected with the antenna through inductive coupling and is used for generating reverse phase induced current to counteract induced current generated by antenna coupling; the antenna is connected with the communication equipment through a wireless signal and is used for transmitting the communication signal of the communication equipment to the loudspeaker component; this application is through setting up the noise elimination subassembly, establishes ties with the battery looks inverting, at antenna radiant energy to noise elimination subassembly, produces the induced-current opposite with the battery, and positive and negative cancellation to with TDD noise elimination, avoid communication to receive the interference, improve the audio frequency quality, protect user's hearing simultaneously.

Drawings

In order to illustrate the present application or prior art more clearly, a brief description of the drawings needed for the description of the embodiments or prior art will be given below, it being clear that the drawings in the following description are some embodiments of the present application and that other drawings can be derived from them by a person skilled in the art without inventive effort.

FIG. 1 is a prior art Bluetooth headset circuit;

FIG. 2 is a schematic block diagram of an embodiment of a TDD noise cancellation circuit of the present application;

FIG. 3 is a schematic diagram of the connection of the inductor winding and the equivalent inductor of the present application;

figure 4 is a schematic diagram of the structure of one embodiment of the TWS bluetooth headset of the present application.

Reference numerals:

1. a speaker assembly; 2. a battery; 3. a noise cancellation component; 4. an antenna.

Detailed Description

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "including" and "having," and any variations thereof, in the description and claims of this application and the description of the above figures are intended to cover non-exclusive inclusions. The terms "first," "second," and the like in the description and claims of this application or in the above-described drawings are used for distinguishing between different objects and not for describing a particular order.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.

The embodiment of the application provides a TDD noise cancellation circuit, and referring to fig. 2, the circuit includes a speaker assembly 1, a battery 2, a noise cancellation assembly 3, and an antenna 4.

The loudspeaker assembly 1 is connected with the battery 2 through inductive coupling; the battery 2 is connected with the noise elimination component 3 in series in an inverted way and is used for providing working current for the circuit; the noise elimination component 3 is connected with the antenna 4 through inductive coupling and is used for generating reverse induction current to counteract induction current generated by the antenna 4 through coupling; the antenna 4 is connected with the communication equipment through wireless signals and used for transmitting communication signals of the communication equipment to the loudspeaker assembly 1.

In the present embodiment, the battery 2 includes a battery main body V3 and an equivalent inductance L3, and the equivalent inductance L3 is a winding equivalent inductance of the positive electrode tab and the negative electrode tab of the battery main body V3.

The positive electrode of the battery main body V3 is connected with the first end of the equivalent inductor L3, and the negative electrode of the battery main body V3 is connected with the first end of the noise elimination component 3; the second end of the equivalent inductor L3 is connected to the second end of the noise cancellation component 3.

In the present embodiment, the antenna 4 has a TDMA (Time division multiple access) operation mode, in the TDMA operation mode, the switching Time slot frequency is 1.6K, and the energy radiated by the antenna 4 to the equivalent inductor L3 of the battery 2 demodulates the harmonic components of 1.6K from the battery, and if the harmonic components enter the speaker assembly 1, the harmonic components will generate interference noise.

In the present embodiment, the above harmonic components are cancelled by the noise cancellation component 3. The noise elimination assembly 3 comprises an inductance winding L2, the first end of the inductance winding L2 is the first end of the noise elimination assembly 3, the second end of the inductance winding L2 is the second end of the noise elimination assembly 3, namely, the first end of the inductance winding L2 is connected with the negative pole of a battery body V3, the second end of the inductance winding L2 is connected with the second end of an equivalent inductance L3, the inductance winding L2 is connected with the dotted end of the equivalent inductance L3, the reverse phase series connection of the inductance winding L2 and the equivalent inductance L3 is realized, the inductance winding L2 can generate a high-frequency current which is opposite to the phase of the equivalent inductance L3 in a loop, the high-frequency current which is coupled with an antenna 4 is counteracted, the generation of harmonic wave components is avoided, an interference source is cut off, the battery 2 is not coupled with the loudspeaker assembly 1 by noise, and the purpose of eliminating noise is realized.

In some optional manners of this embodiment, the inductance winding L2 may be disposed on a circuit board, and formed by routing on the circuit board. The Circuit Board includes, but is not limited to, a PCB (Printed Circuit Board), an FPC (Flexible Printed Circuit), and the like.

In other alternative implementations, the inductor winding L2 may also be a solid inductor.

In this embodiment, the TDD noise canceling circuit further includes a load resistor RL, a first end of the load resistor RL is connected to a first end of the inductor winding L2, and a second end of the load resistor RL is connected to a negative electrode of the battery body V3. The load resistor RL is used for limiting current and avoiding damaging a circuit when the current is overlarge.

In the present embodiment, the antenna 4 is disposed on a flexible circuit board, and is formed by routing on the flexible circuit board, through which signals are transmitted.

In this embodiment, the TDD noise canceling circuit further includes a filter capacitor C1 (not shown in the figure), a first end of the filter capacitor C1 is connected to the antenna 4, and a second end of the filter capacitor C1 is grounded, so as to filter an interference signal in a signal transmitted by the antenna 4, and the interference signal is used in cooperation with the inductor winding L2, so that a noise suppression effect can be increased.

In the present embodiment, the battery 2 is a lithium battery, specifically a round winding lithium battery, which is simple and convenient to use.

Based on the TDD noise canceling circuit, the embodiment of the present application performs noise cancellation using an electromagnetic induction principle.

Specifically, as shown in fig. 3, an inductance winding L2 is disposed outside the battery 2, and an inductance coil (a in fig. 3) of an equivalent inductance L3 of the battery 2 and an inductance coil (B in fig. 3) of the inductance winding L2 are connected at the same name end, so that, in operation, due to the coupling of the antenna 4, the inductance winding L2 generates an opposite-phase induced current opposite to the equivalent inductance L3 in a loop, the inductance winding L2 generates an electromagnetic field with an outward positive pole, and the equivalent inductance L3 generates an electromagnetic field with an inward positive pole, and the positive and negative of the electromagnetic field are cancelled, so as to avoid generation of harmonic components, thereby cutting off an interference source, avoiding noise coupling between the battery 2 and the speaker assembly 1, and eliminating TDD noise, so that the speaker assembly 1, the battery 2, the antenna 4, and the PCB, which originally cannot be stacked together due to a compact space, can be stacked together, thereby not only solving the TDD noise, improving the audio performance of products, but also realizing miniaturization of the products.

Based on the TDD noise canceling circuit, the TWS bluetooth headset according to the embodiment of the present application includes the TDD noise canceling circuit as described above, with reference to fig. 4.

Based on the TWS bluetooth headset, an embodiment of the present application further provides a wireless communication device, which includes a communication device and the TWS bluetooth headset as described above; the TWS Bluetooth headset is in communication connection with the communication equipment through wireless signals.

In this embodiment, the communication device includes, but is not limited to, a smart phone, a tablet, a computer, and the like.

It is to be understood that the above-described embodiments are merely illustrative of some, but not restrictive, of the broad invention, and that the appended drawings illustrate preferred embodiments of the invention and do not limit the scope of the invention. This application is capable of embodiments in many different forms and is provided for the purpose of enabling a thorough understanding of the disclosure of the application. Although the present application has been described in detail with reference to the foregoing embodiments, it will be apparent to one skilled in the art that modifications can be made to the embodiments described in the foregoing detailed description, or equivalents can be substituted for some of the features described therein. All equivalent structures made by using the contents of the specification and the drawings of the present application are directly or indirectly applied to other related technical fields and are within the protection scope of the present application.

Claims

1. A TDD noise canceling circuit, comprising:

a speaker assembly, a battery, a noise cancellation assembly, and an antenna;

the speaker assembly is connected to the battery via inductive coupling;

2. The TDD noise canceling circuit of claim 1, wherein the battery includes a battery body and an equivalent inductor, a positive terminal of the battery body is connected to a first terminal of the equivalent inductor, and a negative terminal of the battery body is connected to a first terminal of the noise canceling component; and the second end of the equivalent inductor is connected with the second end of the noise elimination component.

3. The TDD noise cancellation circuit of claim 2, wherein the noise cancellation component includes an inductive winding, a first end of the inductive winding being a first end of the noise cancellation component, a second end of the inductive winding being a second end of the noise cancellation component.

4. The TDD noise cancellation circuit of claim 3, wherein the inductive winding is disposed on a circuit board.

5. The TDD noise canceling circuit of claim 3, further comprising a load resistor having a first end connected to the first end of the inductive winding and a second end connected to the negative pole of the battery body.

6. The TDD noise canceling circuit of claim 1, wherein the antenna is disposed on a flexible circuit board.

7. The TDD noise canceling circuit of claim 1, further comprising a filter capacitor, a first terminal of the filter capacitor being coupled to the antenna and a second terminal of the filter capacitor being coupled to ground.

8. The TDD noise cancellation circuit according to any one of claims 1-7, wherein the battery is a lithium battery.

9. A TWS bluetooth headset comprising the TDD noise cancellation circuit of any one of claims 1 to 8.

10. A wireless communication apparatus comprising a communication device and the TWS bluetooth headset of claim 9;