CN215991190U - High noise suppression audio signal transmission circuit - Google Patents
High noise suppression audio signal transmission circuit Download PDFInfo
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- CN215991190U CN215991190U CN202122657137.2U CN202122657137U CN215991190U CN 215991190 U CN215991190 U CN 215991190U CN 202122657137 U CN202122657137 U CN 202122657137U CN 215991190 U CN215991190 U CN 215991190U
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Abstract
The utility model discloses a high noise suppression audio signal transmission circuit, which is used for an audio conversion controller and is connected with a power conversion circuit. The utility model not only can provide 15V stable voltage for the audio signal transmission circuit, but also can effectively inhibit or filter interference signals such as noise and the like, so that the volume of the received voice signal is large, the tone quality is clear, the bottom noise is small, and the use perception of a user is improved.
Description
Technical Field
The utility model belongs to the technical field of noise suppression, and relates to a high-noise suppression audio signal transmission circuit.
Background
With the rapid development of communication technology and the wide popularization of communication devices, people increasingly use audio communication methods such as voice to transmit information. In some wireless communication scenes of medium and low frequency bands, the external environment is complex, interference sources are numerous, the noise reduction mode adopted by the existing audio product on the aspect of hardware circuit design is single, noise interference from the inside of a communication system and external noise signals mixed with audio signals after amplification processing cannot be fully filtered, and harsh noise often appears at an audio receiving end to influence the use experience of a user.
SUMMERY OF THE UTILITY MODEL
It is therefore an objective of the claimed invention to provide a high noise suppression audio signal transmission circuit.
In order to achieve the purpose, the technical scheme of the utility model is realized as follows:
the embodiment of the utility model provides a high-noise-suppression audio signal transmission circuit which is used for an audio conversion controller and is connected with a power conversion circuit.
In the above scheme, the input impedance matching module includes a first resistor RS6, an eighth resistor RS2, a ninth resistor RS10, and a seventeenth capacitor C6, the first resistor RS6 and the seventeenth capacitor CS6 are connected in series, one side of an end of the first resistor RS6 is connected to the audio analog signal L08 through the eighth resistor RS2, the other side of the first resistor RS 3583 is connected to the input noise suppression module 220, an end of the seventeenth capacitor C6 is connected to the audio analog signal L09 through the ninth resistor RS10, and the other side of the first resistor RS 3583 is connected to the input noise suppression module.
In the above scheme, the input noise suppression module includes a first transformer T2, a second resistor R3, a third resistor R4, a fourth resistor R15 and an eighteenth capacitor C1, the 1 st and 3 rd ends of the first transformer T2 are respectively connected to the end portions of a first resistor RS6 and a seventeenth capacitor C6, the 4 th and 6 th ends are connected to the second resistor R3, the third resistor R4 is sequentially connected in series to the fourth resistor R15 and the eighteenth capacitor C1, and the eighteenth capacitor C1 is connected to the power amplifier module.
In the above scheme, the power amplifier module includes a power amplifier, a fifth resistor R9, a nineteenth capacitor C2, a twenty-second capacitor C3, a tenth resistor R11, and an eleventh resistor R12, one path of input from the positive terminal of the power amplifier is connected to a 15V power supply provided by the power conversion circuit through the tenth resistor R11, the other path is connected to the eleventh resistor R12 and the twenty-second capacitor C3 which are connected in parallel, one path of input from the negative terminal is connected to the eighteenth capacitor C1, the other ends of the fifth resistor R9 and the nineteenth capacitor C2 which are connected in parallel are connected between the other path of input from the negative terminal of the power amplifier and the output terminal, and the output terminal of the power amplifier is further connected to the output-stage noise suppression module.
In the above scheme, the output stage noise suppression module includes a second transformer T5, a sixth resistor R14, and a twentieth capacitor C4, where the 1 st and 3 rd pins of the second transformer T5 are connected to the output impedance matching module 250, the 4 th pin is grounded, and the 6 th pin is connected to the output end of the operational amplifier through the twentieth capacitor C4 and the sixth resistor R14 in sequence.
In the above scheme, the output impedance matching module includes a seventh resistor RS13 and a twenty-first capacitor C9, and the seventh resistor RS13 and the twenty-first capacitor C9 are connected in series and are connected between two output terminals of the second transformer T5.
Compared with the prior art, the voice signal processing circuit can provide 15V stable voltage for the audio signal transmission circuit, and can effectively inhibit or filter interference signals such as noise and the like, so that the received voice signal has large volume, clear tone quality and small bottom noise, and the use perception of a user is improved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiment(s) of the utility model and together with the description serve to explain the utility model without limiting the utility model. In the drawings:
fig. 1 is a schematic block diagram of an audio signal transmission circuit with high noise suppression according to an embodiment of the present invention;
FIG. 2 is a circuit diagram of an audio signal transmission circuit in an audio signal transmission circuit with high noise suppression according to an embodiment of the present invention;
FIG. 3 shows the signal distortion test results of the audio test equipment ATS-2 according to the present invention;
FIG. 4 is a signal frequency response test result through the audio test equipment ATS-2 using the present invention;
fig. 5 is a circuit diagram of a power conversion circuit in an audio signal transmission circuit with high noise suppression according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit the utility model.
The same or similar reference numerals in the drawings of the present embodiment correspond to the same or similar components; in the description of the present invention, it is to be understood that the terms "upper", "lower", "left", "right", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred devices or elements must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, the terms describing the positional relationships in the drawings are only for illustrative purposes and are not to be construed as limitations of the present patent, and specific meanings of the terms may be understood by those skilled in the art according to specific situations.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, article, or apparatus that comprises the element.
An embodiment of the present invention provides a high noise suppression audio signal transmission circuit, as shown in fig. 1, which is used in an audio conversion controller and connected to a power conversion circuit, where the power conversion circuit is used to provide a stable 15V operating voltage to the audio signal transmission circuit, and the audio signal transmission circuit is used to suppress an interference signal mixed in an audio signal transmission process.
As shown in fig. 2, the audio signal transmission circuit includes an input impedance matching module 210, an input noise suppression module 220, a power amplifier module 230, an output stage noise suppression module 240, and an output impedance matching module 250.
The input impedance matching module 210 includes a first resistor RS6, an eighth resistor RS2, a ninth resistor RS10, and a seventeenth capacitor C6, the first resistor RS6 and the seventeenth capacitor CS6 are connected in series, one side of an end of the first resistor RS6 is connected to the audio analog signal L08 through the eighth resistor RS2, and the other side is connected to the input noise suppression module 220, an end of the seventeenth capacitor C6 is connected to the audio analog signal L09 through the ninth resistor RS10, and the other side is connected to the input noise suppression module 220, so as to implement impedance matching between an input audio channel and a communication receiving system, and eliminate howling noise caused by impedance imbalance in an audio signal input process.
The input noise suppression module 220 includes a first transformer T2, a second resistor R3, a third resistor R4, a fourth resistor R15 and an eighteenth capacitor C1, the 1 st and 3 rd ends of the first transformer T2 are respectively connected to the ends of a first resistor RS6 and a seventeenth capacitor C6, the 4 th and 6 th ends are connected to the second resistor R3, the third resistor R4 is sequentially connected in series to the fourth resistor R15 and the eighteenth capacitor C1, and the eighteenth capacitor C1 is connected to the power amplifier module 230.
The output end of the first transformer T2 and the second resistor R3 form an RL low-pass filter loop for eliminating high-frequency interference signals generated by the external environment in the audio transmission circuit, and the second resistor R3, the third resistor R4, the fourth resistor R15 and the eighteenth capacitor C1 form an RC high-pass loop for eliminating low-frequency interference signals generated by the external environment in the audio transmission circuit.
The power amplifier module 230 is used for amplifying the voltage of an input audio signal and improving the sound quality of an output audio, and comprises a power amplifier, a fifth resistor R9, a nineteenth capacitor C2, a twenty-second capacitor C3, a tenth resistor R11 and an eleventh resistor R12, wherein one path of input of the positive end of the power amplifier is connected to a 15V power supply provided by the power conversion circuit through the tenth resistor R11, the other path of input of the positive end of the power amplifier is connected to the eleventh resistor R12 and the twenty-second capacitor C3 which are connected in parallel, one path of input of the negative end of the power amplifier is connected to the eighteenth capacitor C1, the other ends of the fifth resistor R9 and the nineteenth capacitor C2 which are connected in parallel are connected between the other path of input of the negative end of the power amplifier and the output end of the power amplifier, and the output end of the power amplifier is further connected with the output-stage noise suppression module 230.
The fifth resistor R9 and the nineteenth capacitor C2 are connected in parallel between the negative terminal input and the output terminal of the power amplifier to form a gain adjusting loop.
The output stage noise suppression module 240 is configured to eliminate self-excited noise signals generated by the power amplifier and interference signals generated by an external environment, and includes a second transformer T5, a sixth resistor R14, and a twentieth capacitor C4, where pins 1 and 3 of the second transformer T5 are connected to the output impedance matching module 250, pin 4 is grounded, and pin 6 is connected to the output end of the operational amplifier through the twentieth capacitor C4 and the sixth resistor R14 in sequence.
The output impedance matching module 250 comprises a seventh resistor RS13 and a twenty-first capacitor C9, wherein the seventh resistor RS13 and the twenty-first capacitor C9 are connected in series and are connected between two output ends of the second transformer T5, so as to implement impedance matching between an output audio path and an audio receiving device, and eliminate signal energy loss caused by impedance imbalance in the audio signal output process.
The audio signal transmission circuit solves the problem that part of sound is attenuated after filtering through the combination of the power amplifier and the input and output two-stage filter circuit, avoids damaging the original sound signal, inhibits the noise signal to a certain extent through the two-stage filter circuit, and further improves the anti-interference capability of the audio. Referring to fig. 3 and 4, the ATS-2 audio test equipment is used to simulate audio signals in the frequency ranges of 550mV and 300Hz to 3500Hz, and the audio signals are respectively input into the high noise audio conversion controller through the transmission channel, and the output signal level is about 520mV, the distortion degree is about 0.3%, and the frequency response is a smooth curve around-0.5 dB, which proves that the transmission performance is excellent.
As shown in fig. 5, the power conversion circuit includes an overvoltage protection module 110, a first-stage common mode filtering module 120, a voltage regulation module 130, a second-stage LC filtering module 140, a DC/DC voltage reduction module 150, a third-stage differential mode filtering module 160, and a linear three-terminal voltage regulation module 170, which are connected in sequence.
The overvoltage protection module 110 comprises a direct-insert self-recovery fuse FSZ1 and a piezoresistor RV1, the left end of the direct-insert self-recovery fuse FSZ1 is connected with a 28V input power supply, the right end of the direct-insert self-recovery fuse FSZ is connected with the left end of the piezoresistor RV1, the right end of the piezoresistor RV1 is connected with a 28VGND, two ends of the piezoresistor RV1 are further connected with the first-stage common mode filter module 120, the direct-insert self-recovery fuse FSZ1 and the piezoresistor RV1 form an input power supply overvoltage protection effect, and an inductive switch inhibits or other quick electrical transient events, so that the electromagnetic compatibility of the circuit is improved.
The first-stage common mode filtering module 120 is configured to consume noise energy in the circuit conversion circuit and filter out a common mode interference signal, and includes a common mode inductor L3, a first capacitor CS5, a second capacitor CS1, a third capacitor CS6, and a fourth capacitor CS17, pins 2 and 3 of the common mode inductor L3 are respectively connected to two ends of a first capacitor CS5, pins 1 and 4 are respectively connected to two ends of a second capacitor CS1, one end of the second capacitor CS1 is grounded through a third capacitor CS6, the other end of the second capacitor CS1 is grounded through a fourth capacitor CS17, and the second capacitor CS1 is further connected to the voltage stabilization module 130.
The voltage stabilizing module 130 includes a schottky diode D1 and a fifth capacitor CS9, an anode of the schottky diode D1 is connected to a 1 st pin of a common mode inductor L3 of the first stage common mode filter module 120, a cathode of the schottky diode D1 is connected to one end of the fifth capacitor CS9, the other end of the fifth capacitor CS9 is connected to a 4 th pin of a common mode inductor L3, the schottky diode D1 and the fifth capacitor CS9 are combined to form a charge and discharge loop, and two ends of the fifth capacitor CS9 are further connected to the second stage LC filter module 140.
The schottky diode D1 and the fifth capacitor CS9 form a charge-discharge circuit, which stabilizes the input voltage.
The second stage LC filter module 140 includes a first power inductor L1, a second power inductor L4, a sixth capacitor CS10, a seventh capacitor CS11, an eighth capacitor CS12, and a ninth capacitor CS 3; the input ends of the first power inductor L1 and the second power inductor L4 are sequentially connected in parallel with a sixth capacitor CS10 and a seventh capacitor CS11, the output ends are sequentially connected in parallel with an eighth capacitor CS12 and a ninth capacitor CS3, two ends of the sixth capacitor CS10 are connected with two ends of a fifth capacitor CS9 of the voltage stabilizing module 130, two ends of the ninth capacitor CS3 are connected with the DC/DC voltage reducing module 150, two ends of the ninth capacitor CS3 are connected with two ends of the fifth capacitor CS9, and two ends of the ninth capacitor CS3 are further connected with the DC/DC voltage reducing module 150.
The LC tuning loop formed by the sixth capacitor CS10 and the ninth capacitor CS13 is used for filtering low-frequency noise in the power conversion circuit, and the LC tuning loop formed by the seventh capacitor CS11 and the eighth capacitor CS12 is used for filtering high-frequency noise in the power conversion circuit.
The DC/DC voltage-reducing module 150 includes a TVS diode D2, a DC/DC voltage-reducing chip U1, and a tenth capacitor CS13, wherein pins 1 and 4 of the DC/DC voltage-reducing chip U1 are connected to two ends of the TVS diode D2, pins 2 and 3 are connected to two ends of the sixth capacitor CS10, the TVS diode D2 is connected to two ends of the ninth capacitor CS3, and two ends of the tenth capacitor CS13 are further connected to the third stage differential mode filtering module 160.
The TVS diode D2 is used for preventing surge voltage impact and inhibiting electromagnetic wave interference, the DC/DC voltage reduction chip U1 is used for converting input 28V voltage into 15V output voltage, the tenth capacitor CS13 is used for stabilizing the output voltage, the three devices are combined to form stable voltage reduction, the DC/DC voltage reduction chip U1 can be selected from a model H28S15A3N, the price advantage is obvious, and the output voltage is stable.
The third-stage differential mode filtering module 160 is configured to consume noise energy in the circuit conversion circuit and filter differential mode interference signals, and includes a first magnetic bead B1, a second magnetic bead B2, an eleventh capacitor CS14, a twelfth capacitor CS2, a thirteenth capacitor CS15, and a fourteenth capacitor CS16, where input ends of the first magnetic bead B1 and the second magnetic bead B2 are sequentially connected in parallel to an eleventh capacitor CS14 and a twelfth capacitor CS2, output ends of the first magnetic bead B1 and the second magnetic bead B2 are sequentially connected in parallel to a thirteenth capacitor CS15 and a fourteenth capacitor CS16, two ends of the eleventh capacitor CS14 are connected to two ends of the tenth capacitor CS13, and two ends of the fourteenth capacitor CS16 are further connected to the linear three-terminal voltage stabilizing module 170.
The linear three-terminal voltage stabilizing module 170 is used for eliminating interference caused by power supply ripples and stabilizing output voltage, and includes a linear three-terminal voltage regulator U3, a fifteenth capacitor CS4 and a sixteenth capacitor CS8, wherein a 1 st pin and a 4 th pin of the linear three-terminal voltage regulator U3 are connected to two ends of the fifteenth capacitor CS4, a3 rd pin and a 4 th pin of the linear three-terminal voltage regulator U3 are connected to two ends of a sixteenth capacitor CS8, two ends of the fifteenth capacitor CS4 are connected to two ends of the fourteenth capacitor CS16, one end of the sixteenth capacitor CS8 outputs a 15V power supply, and the other end is grounded.
The power supply conversion circuit can provide stable 15V working voltage for audio products.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention.
Claims (6)
1. A high noise suppression audio signal transmission circuit is used for an audio conversion controller and is connected with a power conversion circuit, and the high noise suppression audio signal transmission circuit is characterized by comprising an input impedance matching module, an input noise suppression module, a power amplification module, an output stage noise suppression module and an output impedance matching module which are sequentially connected.
2. The transmission circuit of claim 1, wherein the input impedance matching module comprises a first resistor RS6, an eighth resistor RS2, a ninth resistor RS10, and a seventeenth capacitor C6, the first resistor RS6 and the seventeenth capacitor CS6 are connected in series, one side of an end of the first resistor RS6 is connected to the audio analog signal L08 through the eighth resistor RS2, the other side of the first resistor RS 3583 is connected to the input noise suppression module 220, an end of the seventeenth capacitor C6 is connected to the audio analog signal L09 through the ninth resistor RS10, and the other side of the seventeenth capacitor C3624 is connected to the input noise suppression module.
3. The audio signal transmission circuit with high noise suppression according to claim 2, wherein the input noise suppression module comprises a first transformer T2, a second resistor R3, a third resistor R4, a fourth resistor R15 and an eighteenth capacitor C1, the 1 st and 3 rd terminals of the first transformer T2 are respectively connected to the terminals of a first resistor RS6 and a seventeenth capacitor C6, the 4 th and 6 th terminals are connected to the second resistor R3, the third resistor R4 is sequentially connected in series to the fourth resistor R15 and the eighteenth capacitor C1, and the eighteenth capacitor C1 is connected to the power amplification module.
4. The transmission circuit of claim 3, wherein the power amplifier module includes a power amplifier, a fifth resistor R9, a nineteenth capacitor C2, a twenty-second capacitor C3, a tenth resistor R11, and an eleventh resistor R12, one path of the positive input of the power amplifier is connected to the 15V power supply provided by the power conversion circuit via a tenth resistor R11, the other path is connected to the eleventh resistor R12 and the twenty-second capacitor C3 in parallel, one path of the negative input of the power amplifier is connected to the eighteenth capacitor C1, the other ends of the fifth resistor R9 and the nineteenth capacitor C2 in parallel are connected between the negative input path and the output end of the power amplifier, and the output end of the power amplifier is further connected to another output-stage noise suppression module.
5. The audio signal transmission circuit with high noise suppression according to claim 4, wherein the output stage noise suppression module comprises a second transformer T5, a sixth resistor R14 and a twentieth capacitor C4, pins 1 and 3 of the second transformer T5 are connected to the output impedance matching module 250, pin 4 is grounded, and pin 6 is connected to the output terminal of the operational amplifier through the twentieth capacitor C4 and the sixth resistor R14 in sequence.
6. The audio signal transmission circuit with high noise suppression according to claim 5, wherein the output impedance matching module comprises a seventh resistor RS13 and a twenty-first capacitor C9, the seventh resistor RS13 and the twenty-first capacitor C9 are connected in series and connected between two output terminals of a second transformer T5.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122657137.2U CN215991190U (en) | 2021-11-02 | 2021-11-02 | High noise suppression audio signal transmission circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202122657137.2U CN215991190U (en) | 2021-11-02 | 2021-11-02 | High noise suppression audio signal transmission circuit |
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| CN215991190U true CN215991190U (en) | 2022-03-08 |
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| CN202122657137.2U Active CN215991190U (en) | 2021-11-02 | 2021-11-02 | High noise suppression audio signal transmission circuit |
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