CN112367580A

CN112367580A - Noise reduction circuit and earphone

Info

Publication number: CN112367580A
Application number: CN202011133142.7A
Authority: CN
Inventors: 刘绍斌; 林金存
Original assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Current assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority date: 2020-10-21
Filing date: 2020-10-21
Publication date: 2021-02-12

Abstract

The application discloses circuit and earphone of making an uproar falls, wherein, the circuit of making an uproar falls and includes: the device comprises a target load, a battery, a power supply unit and a current transient control circuit; the input end of the power supply unit is connected with the battery, and the output end of the power supply unit is connected with the target load; the current transient control circuit is connected with two pins of the power supply unit respectively, or the current transient control circuit is connected with one pin and a grounding terminal of the power supply unit respectively; the current output by the battery flows into the power supply unit, the current change amplitude flowing into the power supply unit is controlled by the current transient control circuit to be reduced, and the current output by the power supply unit flows into the target load for supplying power, or the current output by the battery flows into the power supply unit, and the current output by the power supply unit and the current output by the current transient control circuit flow into the target load for supplying power. This application can promote the tone quality of output sound.

Description

Noise reduction circuit and earphone

Technical Field

The application belongs to the technical field of earphones, and particularly relates to a noise reduction circuit and an earphone.

Background

With the development of technology, more and more electronic devices such as bluetooth headsets are going into people's lives. Users often use bluetooth headsets to answer calls, listen to music, etc. However, when the bluetooth headset is used, noise may be generated due to mutual influence of internal components of the headset, which affects the sound quality of output sound.

Disclosure of Invention

The embodiment of the application provides a circuit and earphone of making an uproar falls can promote the tone quality of output sound.

In a first aspect, an embodiment of the present application provides a noise reduction circuit, including:

the device comprises a target load, a battery, a power supply unit and a current transient control circuit; the input end of the power supply unit is connected with the battery, and the output end of the power supply unit is connected with the target load; the current transient control circuit is connected with two pins of the power supply unit respectively, or the current transient control circuit is connected with one pin and a grounding terminal of the power supply unit respectively; the current output by the battery flows into the power supply unit, the current change amplitude flowing into the power supply unit is controlled by the current transient control circuit to be reduced, and the current output by the power supply unit flows into the target load for supplying power, or the current output by the battery flows into the power supply unit, and the current output by the power supply unit and the current output by the current transient control circuit flow into the target load for supplying power.

In a second aspect, an embodiment of the present application provides a noise reduction circuit, including:

a target load, a battery, and a power supply unit; the input end of the power supply unit is connected with the battery, and the output end of the power supply unit is connected with the target load; the current output by the battery flows into the power supply unit, the change amplitude of the flowing current is controlled to be reduced by the power supply unit, and the current output by the power supply unit flows into the target load for supplying power.

In a third aspect, an embodiment of the present application provides an earphone, which includes an antenna, an audio module, and a noise reduction circuit, where the noise reduction circuit is connected to the antenna and the audio module, respectively, and the noise reduction circuit is provided in an embodiment of the present application.

In the embodiment of the application, through setting up electric current transient control circuit, the electric current of battery output flows into the power supply unit, reduce the electric current amplitude of change that flows into the power supply unit by electric current transient control circuit control, the electric current of power supply unit output flows into the target load and supplies power, or the electric current of battery output flows into the power supply unit, the electric current of power supply unit output and the electric current of electric current transient control circuit output flow into the target load and supply power, reduce the electric current amplitude of change of battery through electric current transient control circuit, or reduce the electric current that obtains from the battery, thereby reduce the noise that produces because of the battery current transient, thereby reduce the influence of each other of internal part, improve the tone quality of numerical value sound. Therefore, the sound quality of the output sound can be improved.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a schematic diagram of a first structure of a noise reduction circuit according to an embodiment of the present disclosure.

Fig. 2 is a schematic diagram of a second structure of a noise reduction circuit according to an embodiment of the present application.

Fig. 3 is a schematic diagram of a third structure of a noise reduction circuit according to an embodiment of the present application.

Fig. 4 is a schematic diagram illustrating a variation trend of an output current of a power supply unit when a current transient control circuit is not provided according to an embodiment of the present application.

Fig. 5 is a schematic diagram illustrating a current variation trend of a battery when a current transient control circuit is not provided according to an embodiment of the present disclosure.

Fig. 6 is a schematic diagram illustrating a variation trend of an audio signal corresponding to noise when a current transient control circuit is not provided according to an embodiment of the present disclosure.

Fig. 7 is a schematic diagram of a current variation trend after optimization according to an embodiment of the present application.

Fig. 8 is a schematic diagram of a connection between a power supply unit and a first pin of a current transient control circuit according to an embodiment of the present disclosure.

Fig. 9 is a schematic diagram of a connection between a power supply unit and a second pin of a current transient control circuit according to an embodiment of the present disclosure.

Fig. 10 is a schematic diagram illustrating a connection between a power supply unit and a third pin of a current transient control circuit according to an embodiment of the present disclosure.

Fig. 11 is a schematic diagram illustrating a connection between a power supply unit and a fourth pin of a current transient control circuit according to an embodiment of the present disclosure.

Fig. 12 is a schematic diagram of a fourth structure of a noise reduction circuit according to an embodiment of the present application.

Fig. 13 is a schematic diagram of a fifth structure of a noise reduction circuit according to an embodiment of the present application.

Fig. 14 is a schematic diagram of a sixth structure of a noise reduction circuit according to an embodiment of the present application.

Fig. 15 is a schematic structural diagram of a DC/DC (Direct current/Direct current, DC/DC) type power supply of an earphone power supply in the related art.

Fig. 16 is a schematic diagram of a first structure of a power supply unit according to an embodiment of the present application.

Fig. 17 is a schematic diagram of a second structure of a power supply unit according to an embodiment of the present application.

Fig. 18 is a schematic diagram of a third structure of a power supply unit according to an embodiment of the present application.

Fig. 19 is a schematic diagram of a fourth structure of a power supply unit according to an embodiment of the present application.

Fig. 20 is a schematic diagram of a seventh structure of a noise reduction circuit according to an embodiment of the present application.

Fig. 21 is an eighth schematic structural diagram of a noise reduction circuit according to an embodiment of the present application.

Fig. 22 is a schematic structural diagram of an earphone according to an embodiment of the present application.

Fig. 23 is a schematic structural diagram of an earphone provided in the embodiment of the present application.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

With the development of technology, more and more electronic devices such as bluetooth headsets are going into people's lives. Users often use bluetooth headsets to answer calls, listen to music, etc.

The left and right earplugs of a True Wireless Stereo (TWS) earphone can work independently by realizing wireless separation of left and right sound channels without cable connection. Its advantages are as follows: 1. the trouble of wired connection is completely eliminated, and the movement is more free; 2. the use modes are various, and the multifunctional electric heating cooker can be used independently and separately and can also be used as two machines; 3. the portable box is internally integrated with a portable power supply, and the earphone is placed in the portable box for charging when the portable box is not powered.

In a true wireless stereo headset, there are two metal PINs at the bottom, called POGO PINs (POGO PINs), which can be placed under the earplugs. When the true wireless stereo earphone is placed in the charging box, the circuit between the true wireless stereo earphone and the charging box is conducted, so that the true wireless stereo earphone is charged and communicated. Two pins and three pins are commonly used, the positions of the two pins and the three pins are respectively located at corresponding positions of the true wireless stereo headset and the charging box, and when the true wireless stereo headset is placed in the charging box, the spring pin on the true wireless stereo headset and the spring pin on the charging box can be just contacted and conducted.

The effect of the box that charges is accomodate true wireless stereo earphone, and there is the battery in the box that charges, has the function of charging for true wireless stereo earphone like this. There will be two copper posts that charge in the box that charges.

When the true wireless stereo headset is not used, the portable charging box may be used to store and charge the true wireless stereo headset. A true wireless stereo headset is typically placed into a charging box, which is magnetically held in place, after which the charging box charges the true wireless stereo headset.

However, when the bluetooth headset is used, noise is generated due to mutual influence of internal parts of the headset, thereby affecting the sound quality of output sound. This noise is also referred to as background noise. There are two main types of noise: one is current noise and the other is white noise. The source of the current sound mainly comprises the interference of electronic components on the loudspeaker, and the electronic components can comprise a power inductor, a battery and the like; white noise is mainly related to the chip itself.

The current method for eliminating background noise such as current noise comprises the following steps: the elimination of the noise is realized by increasing the distance, for example, the distance between the battery and the speaker is increased, and when the distance between the battery and the speaker is increased, the energy radiated by the battery has less interference on the speaker, so that the generated noise is reduced.

In the related art, for a small-sized earphone, due to space limitation, the speaker cannot be far away from the battery, and interference on the battery is still radiated to the speaker, so that noise of the earphone cannot be well eliminated. In order to keep the loudspeaker away from the battery, the distance between the loudspeaker and the battery is increased, so that the size of the earphone is increased, and the wearing comfort and the appearance of the earphone are affected.

In order to solve the above technical problem, an embodiment of the present application provides a noise reduction circuit, where the noise reduction circuit is applied to an audio device, and the audio device may be an earphone, a sound box, or the like. The noise floor of the headset is eliminated by optimizing the power supply, specifically by reducing the transient response of the power supply. The details will be described below separately.

Referring to fig. 1 to 3, fig. 1 is a schematic diagram illustrating a first structure of a noise reduction circuit according to an embodiment of the present disclosure. Fig. 2 is a schematic diagram of a second structure of a noise reduction circuit according to an embodiment of the present application. Fig. 3 is a schematic diagram of a third structure of a noise reduction circuit according to an embodiment of the present application. The noise reduction circuit includes a battery 101, a power supply unit 102, a current transient control circuit 103, and a target load 104; an input terminal of the power supply unit 102 is connected to the battery 101, and an output terminal of the power supply unit 102 is connected to the target load 104.

As shown in fig. 1, the current transient control circuit 103 is connected to two pins of the power supply unit 102. Alternatively, as shown in fig. 2, the current transient control circuit 103 may be connected to one of the two pins of the power supply unit 102 and the ground, respectively, for example, one of the two pins of the current transient control circuit 103 and the power supply unit 102 is connected to the ground. Alternatively, as shown in fig. 3, the current transient control circuit 103 is connected to the other of the two pins of the power supply unit 102 and the ground terminal, respectively.

Wherein the power supply unit 102 is configured to supply power to a target load 104, the current transient control circuit 103 is configured to reduce a current variation amplitude of the battery 101, and the target load 104 is configured to communicate with an external device, such as a headset and an electronic device, and another headset to be paired.

In one embodiment, the battery 101, power supply unit 102 and current transient control circuit 103 may be built into the power supply module of the headset, through which the various modules in the headset may be powered, recharged, and used as a battery, etc.

In another embodiment, the target load 104 may be a radio frequency module. The radio frequency module can be built in a Bluetooth chip, and the Bluetooth chip can be used for controlling the whole system, such as charging control, audio signal processing and the like.

According to the bluetooth communication protocol, the bluetooth chip communicates with the electronic device such as the mobile phone once at intervals, and during communication, the power consumption of the whole system is large, so that the current drawn from the battery 101 end is also large, please refer to fig. 4, where fig. 4 is a schematic diagram illustrating a variation trend of the output current of the power supply unit when the current transient control circuit is not provided according to the embodiment of the present application. In fig. 4, the abscissa of the graph of the variation trend of the output current of the power supply unit 102 is time, and the ordinate is current, and fig. 3 shows the current consumption of the power supply unit 102, and the current becomes larger in a transient state after a period of time. When the current is large, the electromagnetic field flowing through the coil of the loudspeaker is also large, and because the interval time is fixed, a signal with fixed frequency, namely noise, can be generated on the loudspeaker, so that the tone quality of output sound is influenced, and the user experience is influenced.

The power supply unit 102 takes power from the battery 101, and the current on the battery 101 changes dramatically due to the drastic change of the current on the power supply unit 102, and the current on the battery 101 changes accordingly as shown in fig. 5. Fig. 5 is a schematic diagram illustrating a current variation trend of a battery when a current transient control circuit is not provided according to an embodiment of the present disclosure. In fig. 5, the abscissa of the schematic diagram of the current variation trend of the battery 101 is time, and the ordinate is current.

Since the battery 101 is too close to the speaker, i.e. the battery 101 is too close to the speaker, which may cause noise at the speaker, the audio signal corresponding to the noise caused by the above-mentioned drastic level change is shown in fig. 6. Fig. 6 is a schematic diagram illustrating a variation trend of an audio signal corresponding to noise when a current transient control circuit is not provided according to an embodiment of the present disclosure.

In order to reduce noise, the current transient control circuit 103 is provided in the embodiment of the present application, for example, the current output by the battery 101 flows into the power supply unit 102, and the current transient control circuit 103 reduces the change speed of the output voltage of one pin of the power supply unit 102 connected thereto, so as to reduce the change amplitude of the current taken from the battery 101, thereby controlling the change amplitude of the current flowing into the power supply unit 102, and the current output by the power supply unit 102 flows into the target load 104 for supplying power. Alternatively, for example, the current output from the battery 101 flows into the power supply unit 102, and the current output from the power supply unit 102 and the current output from the current transient control circuit 103 flow into the target load 104 to supply power.

Therefore, the current transient control circuit 103 can weaken the transient response of the power supply unit 102, and reduce the current variation amplitude at the battery 101, thereby reducing the interference of the battery 101 on the speaker, and further reducing the noise floor of the earphone. That is, although the current change at the power supply unit 102 is the same as before, the magnitude of the current change at the battery 101 is changed, thereby reducing noise, i.e., reducing noise floor.

For example, please refer to fig. 7, fig. 7 is a schematic diagram illustrating an optimized current trend according to an embodiment of the present disclosure. As can be seen from fig. 7, after the transient response of the power supply unit 102 is weakened, the current change amplitude at the battery 101 is not as large as before, the interference of the battery 101 to the speaker is reduced, and further, the noise floor is reduced, so that the user experience is optimized.

In the embodiment of the present application, by providing the current transient control circuit 103, when the earphone and the electronic device communicate with each other through the target load 104, or when the earphone and the electronic device communicate with each other through the target load 104, the current output by the battery 101 flows into the power supply unit 102, the current transient control circuit 103 controls to reduce the change of the current flowing into the power supply unit 102, the current output by the power supply unit 102 flows into the target load 104 for supplying power, or the current output by the battery 101 flows into the power supply unit 102, the current output by the power supply unit 102 and the current output by the current transient control circuit 103 flow into the target load 104 for supplying power, the current change of the battery 101 is reduced through the current transient control circuit 103, or the current obtained from the battery 101 is reduced, so as to reduce the noise generated by the battery current transient, and thus reduce the interference of the battery 101, namely, the mutual influence of the internal components is reduced, namely, the distance between the battery 101 and the loudspeaker is not increased, the noise of the earphone is reduced, and the tone quality of numerical sound is improved. Therefore, the sound quality of the output sound can be improved, and the noise floor of the earphone can be reduced on the basis of not increasing the volume. Because do not have the volume of increase earphone, consequently this application embodiment can not cause any influence to the comfort level that the user wore the earphone when reducing the end of the voice coil of earphone, can not influence the outward appearance yet, lets the user sound more comfortable moreover, improves man-machine experience.

For example, in an implementation manner, please refer to fig. 8, where fig. 8 is a schematic diagram illustrating a connection between a power supply unit and a first pin of a current transient control circuit according to an embodiment of the present disclosure. The current transient control circuit 103 may include a capacitor C having one end connected to a feedback pin (feedback network) FB of the power supply unit 102 and the other end connected to an output terminal OUT of the power supply unit 102, for reducing a variation speed of an output voltage of the feedback pin of the power supply unit 102 to improve a noise floor problem.

It should be noted that before the capacitor C is added, when the target load 104 works, the target load 104 gets power from the power supply unit 102, and the voltage of the output terminal OUT of the power supply unit 102 is reduced when the power supply unit 102 gets power, and meanwhile, the voltage of the feedback pin FB is also reduced, so that after the power supply unit 102 obtains its own power consumption condition, the power getting from the battery 101 is accelerated to ensure the output voltage of the power supply unit 102 to be stable. In addition, the speed of the power supply unit 102 getting power from the battery 101 end also becomes slow, so the amplitude of the current change getting power from the battery 101 end becomes small accordingly. As can be seen, the method for attenuating the transient response of the power supply in this embodiment is: reducing the feedback network of the power supply unit 102, i.e. the change in voltage caused by the change in output current of the power supply unit 102, slows the response delivered to the power supply unit 102, which may result in a slower transient response. The method can obviously reduce the background noise of the earphone and improve the user experience. After the noise floor is reduced, the user can listen to the music more comfortably. The method can also obviously improve the expressive force of the product, does not need to increase the distance between the battery and the loudspeaker, can avoid the problems of the volume increase of the earphone and the like caused by the increased distance, and thus, the appearance change such as the Identity Document (ID) and the like can not be caused, the appearance is ugly and the human-computer experience is influenced. This embodiment may be directed to a linear power supply as well as to a switching power supply.

It should be noted that the number of the capacitors C connected in parallel between the feedback pin FB and the output terminal OUT of the power supply unit 102 may be one, or may be multiple, for example, two capacitors are connected in parallel between the feedback pin FB and the output terminal OUT of the power supply unit 102, for example, three capacitors are connected in parallel between the feedback pin FB and the output terminal OUT of the power supply unit 102, and the like, which is not limited in this embodiment of the application.

Referring to fig. 9, fig. 9 is a schematic diagram illustrating a connection between a power supply unit and a second pin of a current transient control circuit according to an embodiment of the present disclosure. In fig. 9, one end of the capacitor C is connected to the feedback pin FB of the power supply unit 102, and the difference between fig. 9 and fig. 8 is: the other end of the capacitor C is connected to the ground terminal. By respectively connecting both ends of the capacitor C with the feedback pin FB and the ground terminal of the power supply unit 102, the change speed of the output voltage of the feedback pin FB of the power supply unit 102 can be reduced. The working principle of the method can be described in fig. 7, and is not described in detail herein.

It should be understood that the manner of reducing the current variation of the battery 101 according to the embodiment of the present invention is not limited thereto, i.e. the method is not limited to adopt a method of reducing the transient response, for example, in an embodiment, please refer to fig. 10, and fig. 10 is a schematic diagram of the connection between the power supply unit and the third pin of the current transient control circuit according to the embodiment of the present invention. The current transient control circuit 103 includes a capacitor C, one end of the capacitor C is connected to the output terminal of the power supply unit 102, and the other end of the capacitor C is connected to the ground terminal, that is, the current transient control circuit is implemented by adding the capacitor C to the output terminal of the power supply unit 102.

Because the output capacitance of the power supply unit 102 becomes larger, when the working current of the target load 104 becomes larger, a part of electricity can be taken from the end of the capacitor C, so that the electricity taken from the end of the battery 101 becomes smaller, thereby being beneficial to the stability of the power supply, and reducing the change of the current at the end of the battery 101 caused by the change of the radio frequency power of the target load 104, therefore, some capacitors can be connected in parallel between the output end OUT of the power supply unit 102 and the grounding end to increase the total output capacitance, so as to reduce the bottom noise of the earphone.

It should be noted that the number of the capacitors C connected in parallel between the output end OUT of the power supply unit 102 and the ground end may be one, or may be multiple, for example, two capacitors are connected in parallel between the output end OUT of the power supply unit 102 and the ground end, for example, three capacitors are connected in parallel between the output end OUT of the power supply unit 102 and the ground end, and the like, which is not limited in this embodiment of the application. Because do not have the volume of increase earphone, consequently this application embodiment can not cause any influence to the comfort level that the user wore the earphone when reducing the end of the voice coil of earphone, can not influence the outward appearance yet, lets the user sound more comfortable moreover, improves man-machine experience.

For example, in an implementation manner, please refer to fig. 11, where fig. 11 is a schematic diagram illustrating a connection between a power supply unit and a fourth pin of a current transient control circuit according to an embodiment of the present disclosure. The current transient control circuit 103 may include a capacitor C, one end of the capacitor C is connected to the input terminal of the power supply unit 102, and the other end of the capacitor C is still connected to the ground terminal, that is, the current transient control circuit is implemented by adding the capacitor C to the input terminal of the power supply unit 102. The difference between fig. 11 and fig. 10 is: one end of the capacitor C in fig. 10 is adjusted to be connected to the input terminal of the power supply unit 102.

Because the input capacitance of the power supply unit 102 becomes large, when the working current of the target load 104 becomes large, and the power supply unit 102 gets power from the battery 101, part of the power can be taken from the capacitance C of the input end, so that the power taken from the battery 101 end becomes small, which is beneficial to the stability of the power supply, and the change of the current of the battery 101 end caused by the change of the radio frequency power of the target load 104 in the circuit is also reduced, therefore, some capacitors can be connected in parallel between the input end of the power supply unit 102 and the grounding end to increase the total input capacitance, so as to reduce the bottom noise of the earphone.

For example, in one possible embodiment, the current transient control circuit 103 may include a plurality of capacitors connected in parallel to the power supply unit 102, or a plurality of capacitors connected in parallel to ground. For example, after the capacitors are connected in parallel, one end of each capacitor is connected to the input end or the output end of the power supply unit 102, and the other end of each capacitor is grounded, so that the total input capacitance or the total output capacitance is increased, and the noise floor of the earphone is reduced.

For example, in a possible implementation manner, as shown in fig. 12, fig. 12 is a schematic diagram of a fourth structure of the noise reduction circuit provided in the embodiment of the present application. This fig. 12 differs from fig. 1 in that: the noise reduction circuit may further include a second power unit 105 and a core module 106, an input end of the second power unit 105 is connected to the battery 101, and an output end of the second power unit 105 is connected to the core module 106, where the second power unit 105 is configured to supply power to the core module 106, and the core module 106 is configured to control charging and audio signal processing. The second power supply unit 105 may be built in a power supply module, and the core module 106 may be built in a bluetooth chip. Similarly, on the basis of fig. 2 and fig. 3, the noise reduction circuit may further include a second power supply unit 105 and a core module 106, and the second power supply unit 105 and the core module 106 may refer to the description of fig. 12, and are not described herein again.

It is understood that the bluetooth chip includes a plurality of modules, such as the target load 104 (i.e., the rf module) and the core module 106, and different modules need to use different power sources for power supply, so that multiple power sources are provided in the power module, such as the power source unit 102 and the second power source unit 105, wherein the power source unit 102 supplies power to the target load 104, the second power source unit 105 supplies power to the core module 106, and so on. Different modules are supplied with power through different power supply units so as to adapt to the power supply requirements of different modules.

For example, in a possible implementation manner, as shown in fig. 13, fig. 13 is a schematic diagram of a fifth structure of a noise reduction circuit provided in an embodiment of the present application. This fig. 13 differs from fig. 12 in that: the noise reduction circuit may further include a third power supply unit 107 and an audio processing module 108, an input end of the third power supply unit 107 is connected to the battery 101, and an output end of the third power supply unit 107 is connected to the audio processing module 108, where the third power supply unit 107 is configured to supply power to the audio processing module 108, and the audio processing module 108 is configured to perform audio signal processing. The third power supply unit 107 may be built in a power supply module, and the audio processing module 108 may be built in a bluetooth chip. Similarly, on the basis of adding the second power unit 105 and the core module 106 in fig. 2 and fig. 3, the noise reduction circuit may further include a third power unit 107 and an audio processing module 108, and the third power unit 107 and the audio processing module 108 may refer to the description in fig. 13 and are not repeated herein.

Since there are multiple modules in the bluetooth chip, such as the target load 104, the core module 106, and the audio processing module 108, each module needs to use a different power supply unit for power supply, multiple power supplies are provided in the power supply module, such as the power supply unit 102, the second power supply unit 105, and the third power supply unit 107, where the power supply unit 102 supplies power to the target load 104, the second power supply unit 105 supplies power to the core module 106, the third power supply unit 107 supplies power to the audio processing module 108, and the three power supplies (the power supply unit 102, the second power supply unit 105, and the third power supply unit 107) take power from the battery 101. Different modules are supplied with power through different power supply units so as to adapt to the power supply requirements of different modules.

It is noted that the voltages supplied by the power supply unit 102, the second power supply unit 105 and the third power supply unit 107 are different. If the power supply voltage provided by the power supply unit 102 is a first voltage, the power supply voltage provided by the second power supply unit 105 is a second voltage, and the power supply voltage provided by the third power supply unit 107 is a third voltage, the voltage values of the first voltage, the second voltage, and the third voltage are different.

Referring to fig. 14, fig. 14 is a schematic diagram of six structures of a noise reduction circuit according to an embodiment of the present disclosure. In fig. 14, the noise reduction circuit includes a battery 201, a power supply unit 202, and a target load 203; the input end of the power supply unit 202 is connected with the battery 301, and the output end of the power supply unit 202 is connected with the target load 203; the current output by the battery 201 flows into the power supply unit 202, and the power supply unit 202 controls to reduce the variation amplitude of the current flowing in, and the current output by the power supply unit 202 flows into the target load 203 for supplying power. The power supply unit 202 is used to supply power to the target load 203 and reduce the current variation amplitude of the battery 301, and the target load 203 is used to communicate with an external device, for example, for communication between a headset and an electronic device, and communication with another headset to be paired.

In one embodiment, the battery 201 and the power supply unit 202 may be built into a power supply module of the headset, by which the various modules in the headset may be powered, recharged, as a battery, etc.

In another embodiment, the target load 203 may be a radio frequency module. The radio frequency module can be built in a Bluetooth chip, and the Bluetooth chip can be used for controlling the whole system, such as charging control, audio signal processing and the like.

Fig. 14 differs from fig. 1 in that: the current transient control circuit 103 in fig. 1 is omitted, the function of reducing the transient response of the power supply module is integrated into the power supply unit 202, and the function of reducing the transient response of the power supply module can be realized by changing the circuit structure of the power supply unit 102 in fig. 1. The current output by the battery 201 flows into the power supply unit 202, and the power supply unit 202 controls to reduce the variation amplitude of the current flowing in, and the current output by the power supply unit 202 flows into the target load 203 for supplying power. It is known that the power supply unit 202 is used for supplying power to the target load 203 and reducing the current variation amplitude of the battery 201.

In the embodiment of the present application, by changing the circuit structure of the power supply unit 102, when the headset and the electronic device communicate with each other through the target load 203, or when the headset and the electronic device communicate with each other through the target load 203, the power supply unit 202 can control and reduce the variation amplitude of the current flowing in, so that the transient response function of the power supply module can be reduced, thereby reducing the interference of the battery 201 on the speaker, that is, reducing the mutual influence of the internal components, and reducing the bottom noise of the headset without increasing the distance between the battery 201 and the speaker. Therefore, the sound quality of the output sound is improved, and the noise of the earphone can be reduced on the basis of not increasing the volume. Because do not have the volume of increase earphone, consequently this application embodiment can not cause any influence to the comfort level that the user wore the earphone when reducing the end of the voice coil of earphone, can not influence the outward appearance yet, lets the user sound more comfortable moreover, improves man-machine experience.

In the above, transient response is weakened by changing transmission, the power supply unit 102 in the earphone is generally a DC/DC power supply, i.e., a DC/DC power supply, as shown in fig. 15, fig. 15 is a schematic diagram of a DC/DC power supply of the earphone power supply in the related art, and the DC/DC power supply is a switching power supply. However, due to the fast transient response, when the battery 101 is powered, the current change at the power supply unit 102 is relatively large, and when the battery 101 is relatively close to the speaker, the battery 101 interferes with the speaker, thereby generating a noise floor. To address this issue, the power supply unit 102 may be implemented, for example, as another type of power supply combination. This may reduce the transient response of the power supply unit 102 due to the replacement with another type of power supply network. Which will be described in detail below.

For example, a DC/DC type power supply of a related art earphone power supply may be changed to a linear power supply, please refer to fig. 16, and fig. 16 is a first structural schematic diagram of a power supply unit according to an embodiment of the present application. The power supply unit 202 may comprise at least one linear power supply having an input connected to the battery 201 and an output connected to the target load 203. Fig. 16 shows only one linear power supply as an example, and in other embodiments, there may be multiple linear power supplies, and the number of the linear power supplies is not limited in the embodiment of the present application.

The power supply unit 202 is changed into a linear power supply mode, the transient response of the linear power supply is weaker than that of a switch-type power supply, so that the current change of the battery 201 end is smaller, the mutual influence of internal components can be reduced, the distance between the battery 201 and a loudspeaker does not need to be increased, the bottom noise of the earphone can be reduced on the basis of not increasing the size, and the tone quality of output sound is improved. Because do not have the volume of increase earphone, consequently this application embodiment can not cause any influence to the comfort level that the user wore the earphone when reducing the end of the voice coil of earphone, can not influence the outward appearance yet, lets the user sound more comfortable moreover, improves man-machine experience.

For example, a DC/DC type power supply of a related art earphone power supply may be modified to a combination of a switching power supply + a linear power supply. Referring to fig. 17, fig. 17 is a schematic diagram illustrating a second structure of a power supply unit according to an embodiment of the present disclosure. The power supply unit 202 may include at least one switching power supply connected to a linear power supply and at least one linear power supply. The input terminal of the switching power supply is connected to the battery 201, the output terminal of the switching power supply is connected to the input terminal of the linear power supply, and the output terminal of the linear power supply is connected to the target load 203.

The switching power supply adopts a DC/DC type power supply. The input terminal of the power supply unit 202 passes through the DC/DC power supply first and then the linear power supply. When the load power variation at the output of the power supply unit 202 causes a current variation, a variation in the output of the linear power supply is caused first, then a variation in the output of the DC/DC type power supply is caused, and then a variation in the input of the DC/DC type power supply is caused. Due to the combination of changes between the multiple systems, the transient response of the entire system becomes weak. In addition, the power supply network firstly reduces the input voltage to a proper value by using the DC/DC power supply and then supplies power to the linear power supply, so that the efficiency is high.

Fig. 17 shows only one DC/DC type power supply and one linear power supply as an example, and in other embodiments, the power supply may be a combination of one DC/DC type power supply and a plurality of linear power supplies, a combination of a plurality of DC/DC type power supplies and one linear power supply, or a combination of a plurality of DC/DC type power supplies and a plurality of linear power supplies, and the specific number is not limited in the embodiments of the present application. Therefore, the power supply unit 202 adopts the combination of the switching power supply and the linear power supply, which is helpful for reducing the transient response of the power supply and reducing the mutual influence of the internal components, thereby reducing the bottom noise of the earphone on the basis of not increasing the volume and improving the tone quality of the output sound. Because do not have the volume of increase earphone, consequently this application embodiment can not cause any influence to the comfort level that the user wore the earphone when reducing the end of the voice coil of earphone, can not influence the outward appearance yet, lets the user sound more comfortable moreover, improves man-machine experience.

For example, simply weakening the transient response of the power supply network, the DC/DC type power supply of the earphone power supply in the related art can be changed into a combination of a linear power supply and a switching power supply. Referring to fig. 18, fig. 18 is a schematic diagram illustrating a third structure of a power supply unit according to an embodiment of the present application. The power supply unit 202 includes at least one linear power supply and at least one switching power supply, the linear power supply being connected to the switching power supply. The input end of the linear power supply is connected with the battery 201, the output end of the linear power supply is connected with the input end of the switch power supply, and the output end of the switch power supply is connected with the target load 203.

The switching power supply adopts a DC/DC type power supply. The input terminal of the power supply unit 202 may first pass through the linear power supply, and then pass through the DC/DC type power supply, and the principle is that when the load power change at the output terminal of the power supply unit 202 causes the current change, the output of the DC/DC type power supply is changed first, then the output of the linear power supply is changed, and then the input terminal of the linear power supply is changed. Due to the combination of changes between the multiple systems, the transient response of the entire system becomes weak.

Fig. 18 shows only one linear power supply and one DC/DC type power supply as an example, and in other embodiments, the linear power supply and the multiple DC/DC type power supplies may be combined, the multiple linear power supplies and one DC/DC type power supply may be combined, and the multiple linear power supplies and the multiple DC/DC type power supplies may be combined, and the specific number is not limited in the embodiment of the present application. Therefore, the power supply unit 202 adopts a combination of a linear power supply and a switching power supply, so that the transient response of a power supply network can be weakened, the bottom noise of the earphone can be reduced on the basis of not increasing the volume, and the tone quality of output sound can be improved.

For example, in order to weaken the transient response of the power supply network, the DC/DC type power supply of the earphone power supply in the related art may be changed to a combination of two switching power supplies. Referring to fig. 19, fig. 19 is a fourth structural schematic diagram of a power supply unit according to an embodiment of the present application. The power supply unit 202 comprises at least two switching power supplies, which are connected. One of the switching power supplies has an input terminal connected to the battery 201, and an output terminal connected to an input terminal of the other switching power supply, and the output terminal of the other switching power supply is connected to the target load 203.

Wherein, the switching power supply adopts a DC/DC type power supply. The input of the power supply unit 202 may pass through two DC/DC type power supplies, and the principle is that when the load power change at the output of the power supply unit 202 causes a current change, the output of the following DC/DC type power supply is caused to change first, then the output of the preceding DC/DC type power supply is caused to change, and then the input of the preceding DC/DC type power supply is caused to change. Due to the combination of changes between the multiple systems, the transient response of the entire system becomes weak. Because do not have the volume of increase earphone, consequently this application embodiment can not cause any influence to the comfort level that the user wore the earphone when reducing the end of the voice coil of earphone, can not influence the outward appearance yet, lets the user sound more comfortable moreover, improves man-machine experience.

Fig. 19 shows only two DC/DC power supplies as an example, and in other embodiments, a combination of a plurality of DC/DC power supplies may be used, and the specific number is not limited in the embodiments of the present application. Therefore, the power supply unit 202 can weaken the transient response of the power supply network by adopting the combination of a plurality of switching power supplies, so that the bottom noise of the earphone can be reduced on the basis of not increasing the volume.

It can be seen that the power supply unit 202 may be a single linear power supply, or may be a combination of multiple power supplies, such as a combination of multiple linear power supplies, a combination of multiple switching power supplies, or a combination of multiple linear power supplies + switching power supplies, and the order of the linear power supplies and the switching power supplies may be switched. The transient response of the whole power supply is reduced through the power supply combination, so that the bottom noise of the earphone can be reduced on the basis of not increasing the volume, and the tone quality of output sound is improved. Because do not have the volume of increase earphone, consequently this application embodiment can not cause any influence to the comfort level that the user wore the earphone when reducing the end of the voice coil of earphone, can not influence the outward appearance yet, lets the user sound more comfortable moreover, improves man-machine experience.

For example, in a possible implementation manner, as shown in fig. 20, fig. 20 is a schematic diagram of a seventh structure of a noise reduction circuit provided in an embodiment of the present application. This fig. 20 differs from fig. 14 in that: the noise reduction circuit may further include a second power supply unit 204 and a core module 205, an input end of the second power supply unit 204 is connected to the battery 201, and an output end of the second power supply unit 204 is connected to the core module 205, where the second power supply unit 204 is configured to supply power to the core module 205, and the core module 205 is configured to control charging and audio signal processing. Note that, the second power supply unit 204 may be built in a power supply module, and the core module 205 may be built in a bluetooth chip.

It can be understood that the bluetooth chip includes a plurality of modules, such as the target load 203 and the core module 205, and different modules need to use different power sources for power supply, so that multiple power sources are provided in the power module, such as the power unit 202 and the second power unit 204, where the power unit 202 supplies power to the target load 203, the second power unit 204 supplies power to the core module 205, and so on. Different modules are supplied with power through different power supply units so as to adapt to the power supply requirements of different modules.

For example, in a possible implementation manner, as shown in fig. 21, fig. 21 is an eighth schematic structural diagram of a noise reduction circuit provided in an embodiment of the present application. The difference between fig. 21 and fig. 20 is that: the noise reduction circuit may further include a third power supply unit 206 and an audio processing module 207, an input end of the third power supply unit 206 is connected to the battery 201, and an output end of the third power supply unit 206 is connected to the audio processing module 207, where the third power supply unit 206 is configured to supply power to the audio processing module 207, and the audio processing module 207 is configured to perform audio signal processing. It should be noted that, the third power supply unit 206 may be built in a power supply module, and the audio processing module 207 may be built in a bluetooth chip.

Since there are multiple modules in the bluetooth chip, such as the target load 203, the core module 205, and the audio processing module 207, each of which needs to use a different power supply to supply power, multiple power supplies are provided in the power module, such as the power unit 202, the second power unit 204, and the third power unit 206, where the power unit 202 supplies power to the target load 203, the second power unit 204 supplies power to the core module 205, and the third power unit 206 supplies power to the audio processing module 207, and the three power supplies (the power unit 202, the second power unit 204, and the third power unit 206) take power from the battery 201. Different modules are supplied with power through different power supply units so as to adapt to the power supply requirements of different modules.

It is noted that the voltages provided by the power supply unit 202, the second power supply unit 204 and the third power supply unit 206 are different. If the power supply voltage provided by the power supply unit 202 is a first voltage, the power supply voltage provided by the second power supply unit 204 is a second voltage, and the power supply voltage provided by the third power supply unit 206 is a third voltage, the voltage values of the first voltage, the second voltage, and the third voltage are different.

The embodiment of the present application further provides a headset, which is described below with reference to fig. 22 as an example on the basis of the noise reduction circuit described in fig. 1 to 13.

Fig. 22 is a schematic structural diagram of an earphone according to an embodiment of the present application. In fig. 22, the earphone includes an antenna 301, an audio module 302 and a noise reduction circuit 303, the noise reduction circuit 303 is respectively connected to the antenna 301 and the audio module 302, the noise reduction circuit 303 is the noise reduction circuit provided in the embodiment of the present application in fig. 1 to 13, that is, the power supply module in the noise reduction circuit 303 includes a current transient control circuit.

The antenna 301 is used for radiating and receiving electromagnetic waves, and is mainly used for communication between an earphone and an electronic device such as a mobile phone, and communication between a pair of left and right earphones. The audio module 302 is used for voice signal collection and sound production, and includes a microphone, a speaker, and the like. The bluetooth chip in the noise reduction circuit 303 is mainly used for controlling the whole system, such as controlling charging, processing audio signals, etc., and the power module in the noise reduction circuit 303 is used for supplying power to each module in the headset, charging the headset, and serving as a battery, etc.

Through this circuit 303 of making an uproar falls, when communicating between earphone and the electronic equipment, perhaps when communicating between the earphone, can reduce the electric current amplitude of change of battery to reduce the interference of battery to the speaker, need not to zoom far away battery and speaker promptly, just can reduce the end of making an uproar of earphone. Therefore, the embodiment of the application can reduce the noise at the bottom of the earphone on the basis of not increasing the volume and improve the tone quality of the output sound.

On the basis of the noise reduction circuits described in fig. 14 to fig. 21, the following describes an earphone provided in an embodiment of the present application, taking fig. 23 as an example.

Fig. 23 is a schematic structural diagram of an earphone provided in the embodiment of the present application. In fig. 23, the earphone 400 includes an antenna 401, an audio module 402, and a noise reduction circuit 403, the noise reduction circuit 403 is respectively connected to the antenna 401 and the audio module 402, and the noise reduction circuit 403 is the noise reduction circuit shown in fig. 13 to fig. 20, that is, the power supply unit in the noise reduction circuit 403 may be a single linear power supply, or a combination of multiple power supplies, such as a combination of multiple linear power supplies, a combination of multiple switching power supplies, or a combination of multiple linear power supplies + switching power supplies, and the order of the linear power supplies and the switching power supplies may be changed. The transient response of the whole power supply is reduced through the power supply combination, so that the noise floor of the earphone can be reduced on the basis of not increasing the size.

The antenna 401 is used for radiating and receiving electromagnetic waves, and is mainly used for communication between an earphone and an electronic device such as a mobile phone, and communication between a pair of left and right earphones. The audio module 402 is used for voice signal acquisition and sound production, and includes a microphone, a speaker, and the like. The bluetooth chip in the noise reduction circuit 403 is mainly used for controlling the whole system, such as controlling charging, processing audio signals, etc., and the power module in the noise reduction circuit 403 is used for supplying power to each module in the headset, charging the headset, and serving as a battery, etc.

By the noise reduction circuit 403, when the earphone and the electronic device communicate with each other or the earphone communicates with each other, the current variation range of the battery can be reduced, so that the interference of the battery to the speaker is reduced, that is, the bottom noise of the earphone can be reduced without increasing the distance between the battery and the speaker. Therefore, the embodiment of the application can reduce the noise floor of the earphone on the basis of not increasing the volume.

It should be noted that, the above embodiments of the present application may be combined with each other to cooperate to reduce the noise floor of the earphone without increasing the volume, and are not illustrated herein.

Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.

It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.

In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.

The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.

Claims

1. A noise reduction circuit, comprising:

2. The noise reduction circuit according to claim 1, wherein the current transient control circuit comprises a capacitor, one end of the capacitor is connected to the feedback pin of the power supply unit, and the other end of the capacitor is connected to the output terminal of the power supply unit, so as to reduce the variation speed of the output voltage of the feedback pin of the power supply unit.

3. The noise reduction circuit according to claim 1, wherein the current transient control circuit comprises a capacitor, one end of the capacitor is connected to the feedback pin of the power supply unit, and the other end of the capacitor is connected to ground, for reducing a change speed of the output voltage of the feedback pin of the power supply unit.

4. The noise reduction circuit according to claim 1, wherein the current transient control circuit comprises a capacitor, one end of the capacitor is connected to the output terminal of the power supply unit, and the other end of the capacitor is connected to the ground terminal.

5. The noise reduction circuit according to claim 1, wherein the current transient control circuit comprises a capacitor, one end of the capacitor is connected to the input terminal of the power supply unit, and the other end of the capacitor is connected to the ground terminal.

6. The noise reduction circuit of claim 1, wherein the current transient control circuit comprises a plurality of capacitors connected in parallel to the power supply unit or to the ground.

7. The noise reduction circuit according to any one of claims 1 to 6, wherein the target load is a radio frequency module.

8. A noise reduction circuit, comprising:

9. The noise reduction circuit according to claim 8, wherein the power supply unit comprises at least one linear power supply.

10. The noise reduction circuit according to claim 8, wherein the power supply unit comprises at least one switching power supply and at least one linear power supply, the switching power supply being connected to the linear power supply.

11. The noise reduction circuit according to any one of claims 8 to 10, wherein the target load is a radio frequency module.

12. An earphone comprising an antenna, an audio module and a noise reduction circuit, the noise reduction circuit being connected to the antenna and the audio module respectively, the noise reduction circuit being as claimed in any one of claims 1 to 11.