Audio power amplification circuit capable of eliminating noise and monitoring equipment with circuit

Abstract

The utility model provides an audio power amplification circuit capable of eliminating noise and monitoring equipment with the circuit. The audio power amplification circuit comprises a first input module, a second input module, a Hisilicon monitoring master control module, a power amplification module and an output module. The first input module is used for inputting a main audio signal, and the second input module is used for inputting a background audio signal. And the Hisilicon monitoring main control module is connected with the first input module and the second input module, receives the main audio signal and the background audio signal, and can perform noise elimination operation on the main audio signal based on the background audio signal. And the power amplification module is connected with the Hisilicon monitoring main control module, receives the main audio signal after noise elimination, and is used for performing power amplification operation on the main audio signal. And the output module is connected with the power amplification module and is used for outputting the main audio signal after power amplification.

Description

Technical Field

[0001] This utility model relates to the field of circuit technology, and in particular to an audio power amplifier circuit that can eliminate noise and a monitoring device incorporating the circuit. Background Technology

[0002] In modern society, audio power amplifier circuits are used in various electronic devices to amplify audio signals. Power amplification is achieved by first amplifying the signal voltage and then amplifying the signal current. However, because noise exists in audio power amplifier circuits, audio signals are easily interfered with during transmission. Existing audio power amplifier circuits cannot eliminate background noise such as wind noise and echoes in audio signals; therefore, they suffer from poor signal transmission quality.

[0003] Therefore, there is a need to provide an audio power amplifier circuit that can eliminate noise and a monitoring device with such circuit to solve the above-mentioned technical problems. Utility Model Content

[0004] This invention provides an audio power amplifier circuit that can eliminate noise and a monitoring device with the circuit, effectively solving the technical problem of poor signal transmission quality in existing audio power amplifier circuits.

[0005] This utility model provides an audio power amplifier circuit capable of eliminating noise, comprising,

[0006] The first input module is used to input the main audio signal;

[0007] The second input module is used to input background audio signals;

[0008] The Hisilicon monitoring main control module is connected to the first input module and the second input module. The Hisilicon monitoring main control module receives the main audio signal and the background audio signal, and performs noise cancellation operation on the main audio signal based on the background audio signal.

[0009] A power amplification module is connected to the Hisilicon monitoring main control module. The amplification module receives the main audio signal after noise cancellation and is used to perform power amplification on the main audio signal.

[0010] The output module is connected to the power amplifier module and is used to output the amplified main audio signal.

[0011] Furthermore, the noise-cancelling audio power amplifier circuit includes a first front microphone input jack and a second rear microphone input jack. The first input module includes a first input unit, and the second input module includes a second input unit. The main control module includes a Hisilicon monitoring main control chip, which includes a first main control input pin, a second main control input pin, and a main control output pin. One end of the first input unit is connected to the first front microphone input jack and the second rear microphone input jack, and the other end of the first input unit is connected to the first main control input pin. One end of the second input unit is connected to the first front microphone input jack and the second rear microphone input jack, and the other end of the first input unit is connected to the second main control input pin. The Hisilicon monitoring main control chip is used to perform noise cancellation on the main audio signal based on the background audio signal, and the main control output pin is used to output the noise-cancelled main audio signal.

[0012] The power amplification module includes a power amplification chip, which includes an amplification input pin and an amplification output pin. The output module includes an audio output socket. The amplification input pin is connected to the main control output pin. The power amplification chip is used to amplify the main audio signal. The amplification output pin is connected to the audio output socket and is used to output the amplified main audio signal.

[0013] Furthermore, the second input module includes a transient voltage suppressor, one end of which is connected to the second input unit, and the other end of which is grounded.

[0014] Furthermore, the power amplification module includes a first filtering unit and a second filtering unit. One end of the first filtering unit is connected to the main control output pin, and the other end of the first filtering unit is connected to the amplification input pin. One end of the second filtering unit is connected to the amplification output pin, and the other end of the second filtering unit is connected to the audio output jack.

[0015] Furthermore, the power amplifier module includes a coupling capacitor, one end of which is connected to the main control output pin, and the other end of which is connected to the first filter unit.

[0016] Furthermore, the power amplifier module includes a ferrite bead, one end of which is connected to the second filter unit, and the other end of which is connected to the audio output jack.

[0017] Furthermore, the power amplifier module includes an anti-static diode, one end of which is connected between the ferrite bead and the audio output jack, and the other end of which is grounded.

[0018] Furthermore, the main control chip is a Hisilicon monitoring main control chip.

[0019] Furthermore, the power amplifier chip is a Saint-Gobain micro power amplifier chip.

[0020] A monitoring device comprising any of the noise-canceling audio power amplifier circuits described above.

[0021] Compared with the prior art, the advantages of this utility model are as follows: This utility model provides an audio power amplifier circuit capable of eliminating noise. The audio power amplifier circuit includes a first input module, a second input module, a Hisilicon monitoring main control module, a power amplifier module, and an output module. The first input module is used to input the main audio signal, and the second input module is used to input the background audio signal. The Hisilicon monitoring main control module can perform noise cancellation on the main audio signal based on the background audio signal, and the power amplifier module receives the noise-cancelled main audio signal. The power amplifier module is used to amplify the main audio signal, and the output module is used to output the amplified main audio signal. Because the Hisilicon monitoring main control module can perform noise cancellation on the main audio signal based on the background audio signal, this audio power amplifier circuit eliminates background noise such as wind noise and echo in the main audio signal. Therefore, the main audio signal will not be interfered with by noise during transmission. Thus, this audio power amplifier circuit can transmit the main audio signal with high quality, effectively solving the technical problem of poor signal transmission quality in existing audio power amplifier circuits. This audio power amplifier circuit has a good noise reduction effect, providing users with a superior experience. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments are briefly introduced below. The drawings described below are only the corresponding drawings of some embodiments of this utility model.

[0023] Figure 1 This is a block diagram of an embodiment of the noise-eliminating audio power amplifier circuit of this utility model.

[0024] Figure 2 This is one of the circuit diagrams of an embodiment of the noise-eliminating audio power amplifier circuit of this utility model.

[0025] Figure 3 This is a second circuit diagram of an embodiment of the noise-eliminating audio power amplifier circuit of this utility model.

[0026] Figure 4 This is the third circuit diagram of an embodiment of the noise-eliminating audio power amplifier circuit of this utility model.

[0027] Figure 5 The fourth circuit diagram is an embodiment of the noise-eliminating audio power amplifier circuit of this utility model.

[0028] Figure 6 The fifth circuit diagram is an embodiment of the noise-eliminating audio power amplifier circuit of this utility model.

[0029] In the diagram, 10 is the audio power amplifier circuit; 11 is the first input module; 111 is the first input unit; 112 is the first input unit; 12 is the second input module; 121 is the second input unit; 122 is the second input unit; 13 is the Hisilicon monitoring main control module; 14 is the power amplifier module; 141 is the first filtering unit; 142 is the first filtering unit; 143 is the second filtering unit; 144 is the second filtering unit; 15 is the output module; 16 is the bias voltage input module; and 17 is the bias voltage output module. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0031] The directional terms mentioned in this utility model, such as "up", "down", "front", "back", "left", "right", "inner", "outer", "side", "top" and "bottom", are only for reference to the orientation of the accompanying drawings. The directional terms used are for the purpose of explaining and understanding this utility model, and are not intended to limit this utility model.

[0032] The terms "first" and "second" in this utility model are used for descriptive purposes only and should not be construed as indicating or implying relative importance, nor as a restriction on the order of events.

[0033] In the diagram, units with similar structures are represented by the same labels.

[0034] Please refer to Figure 1This invention provides a noise-canceling audio power amplifier circuit 10. This noise-canceling audio power amplifier circuit 10 is applied in a monitoring device. The audio power amplifier circuit 10 includes a first input module 11, a second input module 12, a Hisilicon monitoring main control module 13, a power amplifier module 14, and an output module 15. The first input module 11 is used to input the main audio signal, and the second input module 12 is used to input the background audio signal. The Hisilicon monitoring main control module 13 is connected to the first input module 11 and the second input module 12. The Hisilicon monitoring main control module 13 receives the main audio signal and the background audio signal, and can perform noise cancellation on the main audio signal based on the background audio signal. The power amplifier module 14 is connected to the Hisilicon monitoring main control module 13. The power amplifier module 14 receives the noise-canceled main audio signal and performs power amplification on the main audio signal. The output module 15 is connected to the power amplifier module 14 and can output the power-amplified main audio signal.

[0035] Please refer to Figures 2 to 6 The following is a detailed description of the specific structure of the noise-canceling audio power amplifier circuit 10:

[0036] Please refer to Figure 2 , Figure 3 and Figure 4 The noise-canceling audio power amplifier circuit 10 includes a first front microphone input jack J7500 and a second rear microphone input jack J7501. The first input module 11 includes a first input unit 111 and a second input unit 112, and the second input module 12 includes a second input unit 121 and a second input unit 122. The Hisilicon monitoring main control module 13 includes a Hisilicon monitoring main control chip U1C. The Hisilicon monitoring main control chip U1C includes a first main control input pin AC_IN0L_N, a first main control input pin AC_IN0L_P, a second main control input pin AC_IN1R_N, a second main control input pin AC_IN1R_P, a main control output pin AC_OUTL, and a main control output pin AC_OUTR.

[0037] Please refer to Figure 2 , Figure 3 and Figure 4The first front microphone input jack J7500 is the left channel input of the audio power amplifier circuit. The second rear microphone input jack J7501 is the right channel input of the audio power amplifier circuit. One end of the first input unit 111 is connected to the first front microphone input jack J7500, and the other end of the first input unit 111 is connected to the first main control input pin AC_IN0L_N. One end of the first input unit 112 is connected to the second rear microphone input jack J7500, and the other end of the first input unit 112 is connected to the first main control input pin AC_IN0L_P. One end of the second input unit 121 is connected to the first front microphone input jack J7501, and the other end of the second input unit 121 is connected to the second main control input pin AC_IN1R_N. One end of the second input unit 122 is connected to the first front microphone input jack J7501, and the other end of the first input unit is connected to the second main control input pin AC_IN1R_P. The first input unit inputs the main audio signal, and the second input unit inputs the background audio signal.

[0038] Please refer to Figure 4 , Figure 5 and Figure 6 The Hisilicon monitoring main control chip U1C can perform noise cancellation on the main audio signal based on the background audio signal. The main control output pins AC_OUTL and AC_OUTR are used to output the noise-cancelled main audio signal. The Hisilicon monitoring main control chip U1C can use the background audio signal to perform subtraction cancellation on the main audio signal, thereby eliminating noise interference in the main audio signal. The power amplifier module 14 includes a power amplifier chip U7500, which is a Sanbang Microelectronics power amplifier chip. The power amplifier chip U7500 includes amplification input pins and amplification output pins. The output module 15 includes an audio output socket. The amplification input pins include amplification input pin -INL and amplification input pin -INR, and the amplification output pins include amplification output pin OUTL and amplification output pin OUTR. The amplification input pin -INL is connected to the main control output pin AC_OUTL, and the amplification input pin -INR is connected to the main control output pin AC_OUTR. The power amplifier chip U7500 is used to amplify the main audio signal. Both the OUTL and OUTR amplification output pins are connected to the audio output jack J502. The amplification output pins are used to output the amplified main audio signal. Furthermore, the audio output jack J502 can output this main audio signal to the left and right channels of the audio power amplifier circuit, respectively.

[0039] Please refer to Figure 2 and Figure 3The second input module 12 includes a transient voltage suppressor. One end of the transient voltage suppressor is connected to the second input unit, and the other end is grounded. The transient voltage suppressor includes transient voltage suppressor D7500 and transient voltage suppressor D7501. Because the second input unit is connected to the transient voltage suppressor, it can suppress surge voltages in the background audio signal. The audio power amplifier circuit also includes a bias voltage input module 16 and a bias voltage input module 17. The bias voltage input module 16 can input bias voltages to the first input unit 111 and the second input unit 121. The bias voltage input module 17 can input bias voltages to the first input unit 112 and the second input unit 122. The bias voltage input module 16 includes a resistor R7500, a capacitor C7502, and a resistor R7501; the bias voltage input module 17 includes a resistor R7503, a capacitor C7507, and a resistor R7504. Furthermore, the bias voltage is a stable voltage and plays a crucial role in the audio system. The bias voltage provides a reference operating point for the microphone, enabling the main audio signal and background audio signal to be accurately captured and transmitted.

[0040] Please refer to Figure 5 The power amplifier module 14 includes a first filtering unit and a second filtering unit. One end of the first filtering unit is connected to the main control output pin, and the other end is connected to the amplification input pin. The first filtering unit includes a first filtering unit 141 and a first filtering unit 132. The first filtering unit 141 includes a resistor R7520, a capacitor C7516, and a resistor R7522; the first filtering unit 142 includes a resistor R7514, a capacitor C7513, and a resistor R7515. One end of the second filtering unit is connected to the amplification output pin, and the other end is connected to the audio output jack. The second filtering unit includes a second filtering unit 143 and a second filtering unit 144. The second filtering unit 143 includes a resistor R7518, a capacitor R7517, and a resistor R7514; the second filtering unit 144 includes a resistor R7510, a capacitor C7512, and a resistor R7513. Because a first filtering unit is connected between the main control output pin and the amplification input pin, and a second filtering unit is connected between the amplification output pin and the audio output socket, the first and second filtering units are used to filter the main audio signal.

[0041] Please refer to Figure 5 and Figure 6The power amplifier module includes coupling capacitors. One end of the coupling capacitor is connected to the main control output pin, and the other end is connected to the first filtering unit. The coupling capacitors include coupling capacitors C7519 and C7515. Because a coupling capacitor is connected between the main control output pin and the first filtering unit, it further filters the main audio signal. The power amplifier module also includes ferrite beads. One end of the ferrite bead is connected to the second filtering unit, and the other end is connected to the audio output jack. The ferrite beads include ferrite beads LB7500 and LB7501. Because a ferrite bead is connected between the second filtering unit and the audio output jack, it further filters the main audio signal. The power amplifier module also includes anti-static diodes. One end of the anti-static diode is connected between the ferrite bead and the audio output jack, and the other end is grounded. The anti-static diodes include anti-static diodes D7502 and D7503. Because an anti-static diode is connected between the ferrite bead and the audio output jack, it eliminates electrostatic interference in the main audio signal.

[0042] The working principle of this utility model is as follows: First, the first front microphone input socket J7500 is the left channel input of the audio power amplifier circuit. The second rear microphone input socket J7501 is the right channel input of the audio power amplifier circuit. The first front microphone input socket J7500 can input both the main audio signal and the background audio signal, while the second rear microphone input socket J7501 mainly inputs the background audio signal. Subsequently, the first input unit of the first input module 11 inputs the main audio signal, and the second input unit of the second input module 12 inputs the background audio signal. To perform surge protection on the background audio signal, a transient voltage suppression transistor is connected to the second input unit. Next, the first main control input pin inputs the main audio signal, and the second main control input pin inputs the background audio signal. The Hisilicon monitoring main control chip U1C can perform noise cancellation on the main audio signal based on the background audio signal, and then the main control output pin outputs the noise-cancelled main audio signal.

[0043] Subsequently, the main audio signal is input to the amplification input pin, and the power amplifier chip U7500 amplifies the main audio signal, outputting the amplified main audio signal from the amplification output pin. Because a first filtering unit is connected between the main control output pin and the amplification input pin, and a second filtering unit is connected between the amplification output pin and the audio output jack, the first and second filtering units are used to filter the main audio signal. To further filter the main audio signal, a coupling capacitor is connected between the main control output pin and the first filtering unit. Then, the audio output jack J7500 can output the main audio signal to the left and right channels of the audio power amplifier circuit, respectively. Because a ferrite bead is connected between the second filtering unit and the audio output jack, the ferrite bead further filters the main audio signal. To eliminate electrostatic interference in the main audio signal, an anti-static diode is connected between the ferrite bead and the audio output jack.

[0044] This invention provides an audio power amplifier circuit capable of noise cancellation. The circuit includes a first input module, a second input module, a Hisilicon monitoring main control module, a power amplification module, and an output module. The first input module is used to input the main audio signal, and the second input module is used to input the background audio signal. The Hisilicon monitoring main control module can perform noise cancellation on the main audio signal based on the background audio signal, and the power amplification module receives the noise-cancelled main audio signal. The power amplification module amplifies the main audio signal, and the output module outputs the amplified main audio signal. Because the Hisilicon monitoring main control module can perform noise cancellation on the main audio signal based on the background audio signal, this audio power amplifier circuit eliminates wind noise and echo in the main audio signal. Furthermore, the main audio signal is not affected by noise during transmission. Therefore, this audio power amplifier circuit can transmit the main audio signal with high quality, effectively solving the technical problem of poor signal transmission quality in existing audio power amplifier circuits. This audio power amplifier circuit has a good noise reduction effect, providing users with a superior experience.

[0045] In summary, although the present invention has been disclosed above with reference to preferred embodiments, the above preferred embodiments are not intended to limit the present invention. Those skilled in the art can make various modifications and refinements without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be determined by the scope defined in the claims.

Claims

1. An audio power amplifier circuit capable of eliminating noise, characterized by comprising: It includes, The first input module is connected with the first front microphone for inputting the main audio signal; The second input module is connected with the second rear microphone for inputting the background audio signal; The HiSilicon monitoring master module is connected with the first input module and the second input module, and receives the main audio signal and the background audio signal, and is used for performing noise elimination operation on the main audio signal based on the background audio signal; The power amplification module is connected with the HiSilicon monitoring master module, receives the main audio signal after noise elimination, and is used for performing power amplification operation on the main audio signal; The output module is connected with the power amplification module, and is used for outputting the main audio signal after power amplification.

2. The noise-cancelling audio power amplifier circuit of claim 1, wherein, The noise-eliminable audio power amplification circuit includes a first front microphone input socket and a second rear microphone input socket, the first input module includes a first input unit, the second input module includes a second input unit, the HiSilicon monitoring master module includes a HiSilicon monitoring master chip, the HiSilicon monitoring master chip includes a first master control input pin, a second master control input pin and a master control output pin, one end of the first input unit is connected with the first front microphone input socket and the second rear microphone input socket, the other end of the first input unit is connected with the first master control input pin, one end of the second input unit is connected with the first front microphone input socket and the second rear microphone input socket, the other end of the second input unit is connected with the second master control input pin, and the HiSilicon monitoring master chip is used for performing noise elimination operation on the main audio signal based on the background audio signal. The working principle is that the background audio signal input by the second rear microphone is subtracted from the main audio signal input by the first front microphone to eliminate the background audio signal, and the remaining main audio signal after noise elimination is output through the master control output pin; The power amplification module includes a power amplification chip, the power amplification chip includes an amplification input pin and an amplification output pin, and the output module includes an audio output socket; the amplification input pin is connected with the master control output pin, the power amplification chip is used for performing power amplification operation on the main audio signal, the amplification output pin is connected with the audio output socket, and the amplification output pin is used for outputting the main audio signal after power amplification.

3. The noise-cancelling audio power amplifier circuit of claim 2, wherein, The second input module includes a transient voltage suppression tube, one end of the transient voltage suppression tube is connected with the second input unit, and the other end of the transient voltage suppression tube is grounded.

4. The noise-cancelling audio power amplifier circuit of claim 2, wherein, The power amplification module includes a first filter unit and a second filter unit, one end of the first filter unit is connected with the master control output pin, and the other end of the first filter unit is connected with the amplification input pin; one end of the second filter unit is connected with the amplification output pin, and the other end of the second filter unit is connected with the audio output socket.

5. The noise-cancelling audio power amplifier circuit of claim 4, wherein, The power amplification module comprises a coupling capacitor, one end of the coupling capacitor is connected to the master control output pin, and the other end of the coupling capacitor is connected to the first filter unit.

6. The noise-cancelling audio power amplifier circuit of claim 4, wherein, The power amplification module comprises a magnetic bead, one end of the magnetic bead is connected to the second filter unit, and the other end of the magnetic bead is connected to the audio output socket.

7. The noise-cancelling audio power amplifier circuit of claim 6, wherein, The power amplification module comprises an anti-static diode, one end of the anti-static diode is connected between the magnetic bead and the audio output socket, and the other end of the anti-static diode is grounded.

8. The noise-cancelling audio power amplifier circuit of claim 2, wherein, The master control chip is a HiSilicon monitoring master control chip.

9. The noise-cancelling audio power amplifier circuit of claim 2, wherein, The power amplification chip is a Shengbang micro power amplification chip.

10. A monitoring device, characterized by The power amplification circuit comprises the noise-eliminating audio power amplification circuit according to any one of claims 1-9.

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