An audio signal delay transmission circuit capable of eliminating POP sound

Abstract

The utility model provides an audio signal delay transmission circuit capable of eliminating POP sound, comprising a main control circuit, an audio signal conversion circuit, an audio signal amplifying circuit, and an audio signal delay transmission circuit control connection, the input end of the audio signal conversion circuit can receive a USB signal output by the main control circuit, the output end of the audio signal conversion circuit is connected to the input end of the audio signal amplifying circuit, the output end of the audio signal amplifying circuit is connected to the input end of the audio signal delay transmission circuit, the output end of the audio signal delay transmission circuit is connected to the input end of the audio signal filtering and noise reduction circuit, and the output end of the audio signal filtering and noise reduction circuit is connected to an audio signal playing device. The beneficial effect of the utility model is that the POP sound generated at the moment of powering on the audio signal amplifying circuit can be eliminated.

Description

Technical Field

[0001] The utility model relates to the technical field of circuits, in particular to an audio signal delay transmission circuit capable of eliminating POP sound. Background Art

[0002] POP sound refers to the brief explosive sound that appears in the sound effect. It is the explosive sound caused by the transient impact brought by various operations when the audio device is powered on or off.

[0003] With the continuous development of science and technology, people's pursuit of the sound quality of audio playback equipment such as speakers and loudspeakers has increased day by day, and they cannot tolerate the existence of noise or other irrelevant noises in the audio playback equipment.

[0004] However, since the external audio signals output by the sound card need to pass through the audio power amplifier before being output to the audio playback device, the audio power amplifier will experience transient impacts caused by various operations at the moment of power-on, resulting in a POP sound when the audio playback device is powered on. This sound can be weakened by adjusting the circuit parameters of the audio power amplifier, such as reducing the input capacitance, but it cannot be completely eliminated. For some users who are sensitive to sound, this is a very bad experience. Utility Model Content

[0005] In order to solve the problems in the prior art, the utility model provides an audio signal delayed transmission circuit capable of eliminating POP sound. By arranging a main control circuit, an audio signal conversion circuit, an audio signal amplifying circuit, an audio signal delayed transmission circuit and an audio signal filtering and noise reduction circuit that cooperate with each other in the audio signal delayed transmission circuit, the audio signal delayed transmission circuit can, under the control of the main control circuit, delay the transmission of the audio signal amplified by the audio signal amplifying circuit to the audio signal filtering and noise reduction circuit, thereby eliminating the POP sound generated at the moment when the audio signal amplifying circuit is powered on, thereby solving the problem in the prior art that the POP sound cannot be completely eliminated.

[0006] The utility model provides an audio signal delay transmission circuit capable of eliminating POP sound, comprising a main control circuit, an audio signal conversion circuit, an audio signal amplifying circuit, an audio signal delay transmission circuit and an audio signal filtering and noise reduction circuit, wherein the main control circuit is controlled and connected with the audio signal conversion circuit, the audio signal amplifying circuit and the audio signal delay transmission circuit, the input end of the audio signal conversion circuit can receive a USB signal output by the main control circuit, the output end of the audio signal conversion circuit is connected with the input end of the audio signal amplifying circuit, the output end of the audio signal amplifying circuit is connected with the input end of the audio signal delay transmission circuit, the output end of the audio signal delay transmission circuit is connected with the input end of the audio signal filtering and noise reduction circuit, the output end of the audio signal filtering and noise reduction circuit is connected with an audio signal playing device, and the audio signal delay transmission circuit can delay the transmission of the audio signal amplified by the audio signal amplifying circuit to the audio signal filtering and noise reduction circuit under the control of the main control circuit.

[0007] The utility model is further improved, the audio signal amplifying circuit is provided with an audio signal amplifying chip U65, a resistor R710, a resistor R712, a resistor R713, a capacitor C902 and a capacitor C907, wherein the audio signal amplifying chip U65 is provided with 16 pins, the first pin of the audio signal amplifying chip U65 is connected to one end of the resistor R712, the other end of the resistor R712 is connected to the output end of the main control circuit, the sixth pin of the audio signal amplifying chip U65 is connected to one end of the resistor R710, One end of the resistor R713 is connected, the other end of the resistor R713 is connected to one end of the capacitor C902 and one end of the capacitor C907, the other end of the capacitor C902 and the other end of the capacitor C907 are both connected to the output end of the audio signal conversion circuit, the third pin of the audio signal amplifying chip U65 is connected to the input end of the audio signal delayed transmission circuit, and the fifth pin of the audio signal amplifying chip U65 is connected to the other end of the resistor R710 and the input end of the audio signal delayed transmission circuit.

[0008] The utility model is further improved, the audio signal delayed transmission circuit is provided with an audio signal delayed transmission chip U66 and a resistor R715, wherein the audio signal delayed transmission chip U66 is provided with 10 pins, the 4th pin of the audio signal delayed transmission chip U66 is connected to the 8th pin of the audio signal delayed transmission chip U66, one end of the resistor R715, and the output end of the main control circuit, the 2nd and 10th pins of the audio signal delayed transmission chip U66 are respectively connected to the 3rd and 5th pins of the audio signal amplifying chip U65, and the 3rd and 9th pins of the audio signal delayed transmission chip U66 are connected to the input end of the audio signal filtering and noise reduction circuit.

[0009] The utility model is further improved, the audio signal filtering and noise reduction circuit is provided with capacitor AC4, capacitor AC5, capacitor AC6, inductor L66 and inductor L67, one end of the capacitor AC4 is connected to the 3rd pin of the audio signal delay transmission chip U66, one end of the capacitor AC6, and one end of the inductor L66, one end of the capacitor AC5 is connected to the 9th pin of the audio signal delay transmission chip U66, the other end of the capacitor AC6, and one end of the inductor L67, the other end of the inductor L66 and the other end of the inductor L67 are connected to the audio signal playing device, and the other end of the capacitor AC4 and the other end of the capacitor AC5 are grounded.

[0010] The utility model is further improved in that an audio conversion chip is arranged in the audio signal conversion circuit, and the model of the audio conversion chip is CJC6811A.

[0011] The utility model is further improved. A central processing unit is provided in the main control circuit. The model of the central processing unit is RK3399. The central processing unit is provided with a GPIO control pin. The GPIO control pin of the central processing unit is connected to the other end of the resistor R712, the 4th pin of the audio signal delay transmission chip U66, the 8th pin of the audio signal delay transmission chip U66, and one end of the resistor R715.

[0012] The utility model is further improved, and the resistance value of the resistor R712 is 10KΩ.

[0013] The utility model is further improved, and the resistance value of the resistor R715 is 10KΩ.

[0014] Compared with the prior art, the beneficial effect of the utility model is that it provides an audio signal delayed transmission circuit capable of eliminating POP sound, and by arranging a main control circuit, an audio signal conversion circuit, an audio signal amplifying circuit, an audio signal delayed transmission circuit and an audio signal filtering and noise reduction circuit that cooperate with each other in the audio signal delayed transmission circuit, the audio signal delayed transmission circuit can, under the control of the main control circuit, delay the transmission of the audio signal amplified by the audio signal amplifying circuit to the audio signal filtering and noise reduction circuit, and then delay the transmission to the audio playback device, that is, the audio signal is transmitted to the audio playback device after the audio signal amplifying circuit is fully and normally operated, and the POP sound generated at the moment when the audio signal amplifying circuit is powered on can be eliminated. The circuit is simple and convenient, has strong reliability, greatly improves the user experience, and solves the problem that the POP sound cannot be completely eliminated in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the solutions in the present invention or the prior art, a brief introduction is given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0016] Figure 1 This is a principle block diagram of an audio signal delay transmission circuit capable of eliminating POP sound according to the utility model;

[0017] Figure 2 This is a circuit diagram of an audio signal delay transmission circuit capable of eliminating POP sound according to the utility model;

[0018] Figure 3 This is a circuit diagram of an audio signal delay transmission circuit capable of eliminating POP sound according to the utility model;

[0019] Figure 4 The utility model is a circuit diagram of an audio signal delay transmission circuit capable of eliminating POP sound. DETAILED DESCRIPTION

[0020] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by technicians in the technical field of the present utility model; the terms used in the specification of the application herein are only for the purpose of describing specific embodiments and are not intended to limit the present utility model; the terms "including" and "having" and any variations thereof in the specification and claims of the present utility model and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of the present utility model or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order.

[0021] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present invention. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0022] In order to enable those skilled in the art to better understand the solution of the utility model, the technical solution in the embodiments of the utility model will be clearly and completely described below in conjunction with the accompanying drawings.

[0023] like Figure 1-4 As shown, the utility model provides an audio signal delay transmission circuit capable of eliminating POP sound, comprising a main control circuit, an audio signal conversion circuit, an audio signal amplifying circuit, an audio signal delay transmission circuit and an audio signal filtering and noise reduction circuit, wherein the main control circuit is controlled and connected with the audio signal conversion circuit, the audio signal amplifying circuit and the audio signal delay transmission circuit, the input end of the audio signal conversion circuit can receive the USB signal output by the main control circuit, the output end of the audio signal conversion circuit is connected to the input end of the audio signal amplifying circuit, the output end of the audio signal amplifying circuit is connected to the input end of the audio signal delay transmission circuit, the output end of the audio signal delay transmission circuit is connected to the input end of the audio signal filtering and noise reduction circuit, and the output end of the audio signal filtering and noise reduction circuit is connected to an audio signal playing device. In this embodiment, the audio signal delay transmission circuit can delay the transmission of the audio signal amplified by the audio signal amplifying circuit to the audio signal filtering and noise reduction circuit under the control of the main control circuit, and then delay the transmission to the audio playing device, that is, the audio signal is transmitted to the audio playing device after the audio signal amplifying circuit is fully and normally operated, and the POP sound generated at the moment of powering on the audio signal amplifying circuit can be eliminated, the circuit is simple and convenient, the reliability is strong, and the user experience is greatly improved.

[0024] like Figure 2As shown, the audio signal amplifying circuit is provided with an audio signal amplifying chip U65, a resistor R710, a resistor R712, a resistor R713, a capacitor C902 and a capacitor C907, wherein the audio signal amplifying chip U65 is provided with 16 pins, the first pin of the audio signal amplifying chip U65 is connected to one end of the resistor R712, the other end of the resistor R712 is connected to the output end of the main control circuit, the sixth pin of the audio signal amplifying chip U65 is connected to one end of the resistor R710 and one end of the resistor R713, the other end of the resistor R713 is connected to one end of the capacitor C902 and one end of the capacitor C907, the other end of the capacitor C902 and the other end of the capacitor C907 are both connected to the output end of the audio signal conversion circuit, the third pin of the audio signal amplifying chip U65 is connected to the input end of the audio signal delay transmission circuit, the fifth pin of the audio signal amplifying chip U65 is connected to the other end of the resistor R710 and the input end of the audio signal delay transmission circuit, and the resistance value of the resistor R712 is 10KΩ. In this embodiment, the audio signal amplifying circuit is used to amplify the audio signal output by the audio signal converting circuit and then output the amplified audio signal to the audio signal delay transmission circuit.

[0025] like Figure 3 As shown, the audio signal delay transmission circuit is provided with an audio signal delay transmission chip U66 and a resistor R715, wherein the audio signal delay transmission chip U66 is provided with 10 pins, the 4th pin of the audio signal delay transmission chip U66 is connected to the 8th pin of the audio signal delay transmission chip U66, one end of the resistor R715, and the output end of the main control circuit, the 2nd and 10th pins of the audio signal delay transmission chip U66 are respectively connected to the 3rd and 5th pins of the audio signal amplification chip U65, the 3rd and 9th pins of the audio signal delay transmission chip U66 are connected to the input end of the audio signal filtering and noise reduction circuit, and the resistance value of the resistor R715 is 10KΩ. In this embodiment, the audio signal delay transmission circuit can delay the transmission of the audio signal amplified by the audio signal amplification circuit to the audio signal filtering and noise reduction circuit under the control of the main control circuit.

[0026] like Figure 4 As shown, the audio signal filtering and noise reduction circuit is provided with capacitor AC4, capacitor AC5, capacitor AC6, inductor L66 and inductor L67, one end of capacitor AC4 is connected to the 3rd pin of the audio signal delay transmission chip U66, one end of capacitor AC6 and one end of inductor L66, one end of capacitor AC5 is connected to the 9th pin of the audio signal delay transmission chip U66, the other end of capacitor AC6 and one end of inductor L67, the other end of inductor L66 and the other end of inductor L67 are connected to the audio signal playback device, and the other end of capacitor AC4 and the other end of capacitor AC5 are grounded. In this embodiment, the audio signal filtering and noise reduction circuit is used to filter and reduce the noise of the audio signal transmitted by the audio signal delay transmission circuit and output it to the audio playback device for playback.

[0027] like Figure 1 As shown, the audio signal conversion circuit is provided with an audio conversion chip, the model of the audio conversion chip is CJC6811A, the main control circuit is provided with a central processing unit, the model of the central processing unit is RK3399, and the central processing unit is provided with a GPIO control pin, and the GPIO control pin of the central processing unit is connected to the other end of the resistor R712, the 4th pin of the audio signal delay transmission chip U66, the 8th pin of the audio signal delay transmission chip U66, and one end of the resistor R715. In this embodiment, the audio signal conversion circuit converts the USB signal of the main control circuit into an audio signal, and then amplifies the audio signal through the audio signal amplification circuit, and then delays the transmission of the audio signal to the audio signal filtering and noise reduction circuit through the audio signal delay transmission circuit, and then delays the transmission to the audio playback device, wherein the GPIO control pin of the central processing unit is used as a switch to control the audio signal amplification circuit and the audio signal delay transmission circuit, so that the audio signal delay transmission circuit can be turned on after the audio signal amplification circuit is powered on, thereby eliminating the POP sound generated at the moment when the audio signal amplification circuit is powered on.

[0028] As can be seen from the above, the utility model provides an audio signal delayed transmission circuit capable of eliminating POP sound. By arranging a main control circuit, an audio signal conversion circuit, an audio signal amplifying circuit, an audio signal delayed transmission circuit and an audio signal filtering and noise reduction circuit that cooperate with each other in the audio signal delayed transmission circuit, the audio signal delayed transmission circuit can, under the control of the main control circuit, delay the transmission of the audio signal amplified by the audio signal amplifying circuit to the audio signal filtering and noise reduction circuit, and then delay the transmission to the audio playback device, that is, the audio signal is transmitted to the audio playback device after the audio signal amplifying circuit is fully and normally operated, and the POP sound generated at the moment when the audio signal amplifying circuit is powered on can be eliminated. The circuit is simple and convenient, has strong reliability, greatly improves the user experience, and solves the problem that the POP sound cannot be completely eliminated in the prior art.

[0029] The specific implementation methods described above are preferred implementation methods of the present utility model, and are not intended to limit the specific implementation scope of the present utility model. The scope of the present utility model includes but is not limited to the specific implementation methods. All equivalent changes made in accordance with the present utility model are within the protection scope of the present utility model.

Claims

1. An audio signal delay transmission circuit capable of eliminating POP sound, characterized in that: The audio signal transmission device comprises a main control circuit, an audio signal conversion circuit, an audio signal amplifying circuit, an audio signal delay transmission circuit and an audio signal filtering and noise reduction circuit. The main control circuit is controlled and connected with the audio signal conversion circuit, the audio signal amplifying circuit and the audio signal delay transmission circuit. The input end of the audio signal conversion circuit can receive a USB signal output by the main control circuit. The output end of the audio signal conversion circuit is connected to the input end of the audio signal amplifying circuit. The output end of the audio signal amplifying circuit is connected to the input end of the audio signal delay transmission circuit. The output end of the audio signal delay transmission circuit is connected to the input end of the audio signal filtering and noise reduction circuit. The output end of the audio signal filtering and noise reduction circuit is connected to an audio signal playing device. The audio signal delay transmission circuit can delay the transmission of the audio signal amplified by the audio signal amplifying circuit to the audio signal filtering and noise reduction circuit under the control of the main control circuit.

2. The audio signal delay transmission circuit capable of eliminating POP sound according to claim 1, characterized in that: The audio signal amplifying circuit is provided with an audio signal amplifying chip U65, a resistor R710, a resistor R712, a resistor R713, a capacitor C902 and a capacitor C907, wherein the audio signal amplifying chip U65 is provided with 16 pins, the first pin of the audio signal amplifying chip U65 is connected to one end of the resistor R712, the other end of the resistor R712 is connected to the output end of the main control circuit, the sixth pin of the audio signal amplifying chip U65 is connected to one end of the resistor R710 and one end of the resistor R713, the other end of the resistor R713 is connected to one end of the capacitor C902 and one end of the capacitor C907, the other end of the capacitor C902 and the other end of the capacitor C907 are both connected to the output end of the audio signal conversion circuit, the third pin of the audio signal amplifying chip U65 is connected to the input end of the audio signal delay transmission circuit, and the fifth pin of the audio signal amplifying chip U65 is connected to the other end of the resistor R710 and the input end of the audio signal delay transmission circuit.

3. The audio signal delay transmission circuit capable of eliminating POP sound according to claim 2, characterized in that: The audio signal delayed transmission circuit is provided with an audio signal delayed transmission chip U66 and a resistor R715, wherein the audio signal delayed transmission chip U66 is provided with 10 pins, the 4th pin of the audio signal delayed transmission chip U66 is connected to the 8th pin of the audio signal delayed transmission chip U66, one end of the resistor R715, and the output end of the main control circuit, the 2nd and 10th pins of the audio signal delayed transmission chip U66 are respectively connected to the 3rd and 5th pins of the audio signal amplifying chip U65, and the 3rd and 9th pins of the audio signal delayed transmission chip U66 are connected to the input end of the audio signal filtering and noise reduction circuit.

4. The audio signal delay transmission circuit capable of eliminating POP sound according to claim 3, characterized in that: The audio signal filtering and noise reduction circuit is provided with capacitor AC4, capacitor AC5, capacitor AC6, inductor L66 and inductor L67. One end of the capacitor AC4 is connected to the 3rd pin of the audio signal delay transmission chip U66, one end of the capacitor AC6, and one end of the inductor L66. One end of the capacitor AC5 is connected to the 9th pin of the audio signal delay transmission chip U66, the other end of the capacitor AC6, and one end of the inductor L67. The other end of the inductor L66 and the other end of the inductor L67 are connected to an audio signal playing device. The other end of the capacitor AC4 and the other end of the capacitor AC5 are grounded.

5. The audio signal delay transmission circuit capable of eliminating POP sound according to claim 4, characterized in that: An audio conversion chip is arranged in the audio signal conversion circuit, and the model of the audio conversion chip is CJC6811A.

6. The audio signal delay transmission circuit capable of eliminating POP sound according to claim 5, characterized in that: The main control circuit is provided with a central processing unit, the model of the central processing unit is RK3399, and the central processing unit is provided with a GPIO control pin. The GPIO control pin of the central processing unit is connected to the other end of the resistor R712, the 4th pin of the audio signal delay transmission chip U66, the 8th pin of the audio signal delay transmission chip U66, and one end of the resistor R715.

7. The audio signal delay transmission circuit capable of eliminating POP sound according to claim 6, characterized in that: The resistance of the resistor R712 is 10KΩ.

8. The audio signal delay transmission circuit capable of eliminating POP sound according to claim 7, characterized in that: The resistance value of the resistor R715 is 10KΩ.

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