CN216930302U

CN216930302U - Circuit for eliminating loudspeaker noise

Info

Publication number: CN216930302U
Application number: CN202220762781.8U
Authority: CN
Inventors: 冉聪; 李钧; 杨号; 骆剑斌; 鲁斌; 谢宇; 刘贺; 刘益
Original assignee: Chongqing Yazaki Meter Co Ltd
Current assignee: Chongqing Yazaki Meter Co Ltd
Priority date: 2022-04-02
Filing date: 2022-04-02
Publication date: 2022-07-08
Anticipated expiration: 2032-04-02

Abstract

The utility model discloses a circuit for eliminating the noise of a loudspeaker, which can filter other sounds irrelevant to a sound source and eliminate the noise by adding a high-pass filter circuit and a low-pass filter circuit at two ends of the loudspeaker, thereby ensuring that the sound source is crisp and pleasant.

Description

Circuit for eliminating loudspeaker noise

Technical Field

The utility model relates to the technical field of circuits, in particular to a circuit for eliminating noise of a loudspeaker.

Background

In the existing market, more and more scenes are used for applying the loudspeaker, so that the quality of the loudspeaker is focused by people. The existing loudspeaker is often accompanied with some noises when playing sound, which causes interference to the hearing of people, and simultaneously has poor experience, so that the noises need to be eliminated.

SUMMERY OF THE UTILITY MODEL

The utility model provides a circuit for eliminating the noise of a loudspeaker, aiming at the problem of noise in the loudspeaker in the prior art.

In order to achieve the purpose, the utility model provides the following technical scheme:

a circuit for eliminating loudspeaker noise comprises a power amplifier chip U1:

an IN + port of the U1 is respectively connected with one end of a first resistor and one end of a fifth capacitor, the other end of the first resistor is connected with one end of a first capacitor, and a sound signal is input into the other end of the first capacitor; an IN-port of the U1 is respectively connected with one end of a second resistor and one end of a second capacitor, and the other end of the second resistor inputs a sound signal;

a VO-port of the U1 is respectively connected with the other end of the fifth capacitor and one end of a third resistor, and the other end of the third resistor is connected with the 1 st port of the loudspeaker; the VO + port of the U1 is connected with the other end of the third capacitor and one end of the fourth resistor respectively, and the other end of the fourth resistor is connected with the 2 nd port of the loudspeaker.

Preferably, the first capacitor, the second resistor and the first resistor form a high-pass filter circuit, which performs high-pass filtering on the input sound signal to eliminate low-frequency noise.

Preferably, the fifth capacitor and the third capacitor form a low-pass filter circuit to eliminate high-frequency noise.

Preferably, the capacitance value of the first capacitor is 0.47uF, the resistance value of the first resistor is 10K Ω, and the resistance value of the second resistor is 20K Ω.

Preferably, the capacitance values of the fifth capacitor and the third capacitor are both 1000 pF.

Preferably, the protection circuit further comprises:

the BYPASS port of the U1 is connected with one end of the second capacitor, and the other end of the second capacitor is connected with the GND port of the U1 in parallel and then grounded.

Preferably, the power supply circuit further comprises:

the VDD port of U1 is connected with the one end of fourth electric capacity, the one end of first magnetic bead respectively, and the other end ground connection of fourth electric capacity, the other end of first magnetic bead connects 5V voltage.

In summary, due to the adoption of the technical scheme, compared with the prior art, the utility model at least has the following beneficial effects:

the utility model can filter other sounds irrelevant to the sound source and eliminate noise by adding the high-pass filter circuit and the low-pass filter circuit at the two ends of the loudspeaker, thereby ensuring that the sound source is crisp and pleasant.

Description of the drawings:

fig. 1 is a schematic diagram of a circuit for canceling loudspeaker noise according to an exemplary embodiment of the present invention.

Detailed Description

The present invention will be described in further detail with reference to examples and embodiments. It should be understood that the scope of the above-described subject matter is not limited to the following examples, and any techniques implemented based on the disclosure of the present invention are within the scope of the present invention.

In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention.

As shown in fig. 1, the present invention provides a circuit for eliminating speaker noise, which comprises a power amplifier chip U1 (model number is TPA6211A1TDGNRQ 1):

the IN + port of U1 is connected to one end of a first resistor R1 and one end of a fifth capacitor C5, respectively, the other end of the first resistor R1 is connected to one end of a first capacitor C1, and the other end of the first capacitor C1 is connected to a sound signal pre-processing circuit (belonging to the prior art, for preprocessing sound, for example, removing invalid sound) to input a sound signal; the IN-port of the U1 is connected to one end of a second resistor R2 and one end of a second capacitor C2, respectively, and the other end of the second resistor R2 is connected to a sound signal pre-processing circuit (belonging to the prior art, for preprocessing sound, such as removing hum) to input a sound signal;

the VO-port of the U1 is respectively connected with the other end of the fifth capacitor C5 and one end of a third resistor R3, and the other end of the third resistor R3 is connected with the 1 st port of the loudspeaker; the VO + port of the U1 is connected to the other end of the third capacitor C3 and one end of the fourth resistor R4, respectively, and the other end of the fourth resistor R4 is connected to the 2 nd port of the speaker.

In this embodiment, the first capacitor C1, the second resistor R2, and the first resistor R1 form a high-pass filter circuit, which performs high-pass filtering on the input sound signal to eliminate low-frequency (32Hz) noise;

in this embodiment, the fifth capacitor C5, the third capacitor C3, and the pull-down resistor inside the U1 form a low-pass filter circuit to eliminate high-frequency (8KHz) noise;

therefore, after the input sound signal passes through the high-pass filter circuit and the low-pass filter circuit, other sounds irrelevant to the sound source can be filtered, and the sound source is guaranteed to be crisp and pleasant.

In this embodiment, the resistance value and the capacitance value in the high-pass filter circuit and the low-pass filter circuit can be set according to the frequency of a specific sound file, so as to meet different playing requirements, and the high-pass filter circuit and the low-pass filter circuit are simple in structure and lower in cost.

For example, C3 ═ C5 ═ 1000 pF; c1 ═ 0.47uF, R1 ═ 10K Ω, and R2 ═ 20K Ω.

In this embodiment, the U1 is further provided with a SHUTDOWN port for performing SHUTDOWN operation on the power amplifier chip.

In this embodiment, the apparatus further includes a protection circuit, configured to close the power amplifier chip when the rear-stage silent play is performed, so that the power amplifier chip is in the low power consumption mode:

the BYPASS port of the U1 is connected with one end of a second capacitor C2, and the other end of the second capacitor C2 is connected with the GND port of the U1 in parallel and then grounded. C2 ═ 22 uF.

In this embodiment, the power supply circuit further includes:

a VDD port of the U1 is connected to one end of the fourth capacitor C4 and one end of the first magnetic bead FB1, the other end of the fourth capacitor C4 is grounded, and the other end of the first magnetic bead FB1 is connected to a voltage of 5V.

In this example, C4 ═ 7 uF.

It will be understood by those of ordinary skill in the art that the foregoing embodiments are specific examples of practicing the utility model, and that various changes in form and detail may be made therein without departing from the spirit and scope of the utility model in practice.

Claims

1. A circuit for eliminating loudspeaker noise is characterized by comprising a power amplifier chip U1:

an IN + port of the U1 is respectively connected with one end of a first resistor and one end of a fifth capacitor, the other end of the first resistor is connected with one end of a first capacitor, and a sound signal is input into the other end of the first capacitor; an IN-port of the U1 is respectively connected with one end of a second resistor and one end of a second capacitor, and a sound signal is input at the other end of the second resistor;

2. The circuit of claim 1, wherein the first capacitor, the second resistor, and the first resistor form a high pass filter circuit for high pass filtering the input sound signal to remove low frequency noise.

3. The circuit for canceling loudspeaker noise according to claim 1, wherein the fifth capacitor and the third capacitor form a low-pass filter circuit for canceling high-frequency noise.

4. A circuit for canceling loudspeaker noise according to claim 2, wherein the capacitance of the first capacitor is 0.47uF, the resistance of the first resistor is 10K Ω, and the resistance of the second resistor is 20K Ω.

5. A circuit for canceling loudspeaker noise according to claim 3, wherein the capacitance of each of said fifth capacitor and said third capacitor is 1000 pF.

6. A circuit for canceling loudspeaker noise according to claim 1, further comprising a protection circuit:

7. A circuit for canceling loudspeaker noise according to claim 1, further comprising a power circuit: