CN111294700A

CN111294700A - POP noise suppression device, power amplifier and electronic equipment

Info

Publication number: CN111294700A
Application number: CN201811637706.3A
Authority: CN
Inventors: 鲁文先; 程剑平; 李孟璋
Original assignee: Spreadtrum Communications Shenzhen Co ltd
Current assignee: Spreadtrum Communications Shenzhen Co ltd
Priority date: 2018-12-29
Filing date: 2018-12-29
Publication date: 2020-06-16
Anticipated expiration: 2038-12-29
Also published as: CN111294700B

Abstract

The present disclosure relates to a POP noise suppressing apparatus, a power amplifier, and an electronic device, which are applied to an audio power amplifier, the POP noise suppressing apparatus including: at least one input for receiving an input signal; the first branch circuit comprises a first resistor, and the output side of the first branch circuit is used for outputting processed signals; and one end of the adjustable resistance component is connected with the input side of each first branch circuit, the other end of the adjustable resistance component is grounded, the resistance value of the adjustable resistance component is adjusted based on the received adjustment instruction, and the adjustment instruction is a digital signal or an analog signal which changes slowly. The embodiment of the disclosure can suppress the generation of POP noise.

Description

POP noise suppression device, power amplifier and electronic equipment

Technical Field

The present disclosure relates to the field of audio signal processing, and in particular, to a POP noise suppression device, a power amplifier, and an electronic device.

Background

Analog signal processing units in the audio processing system, such as a DAC and a pre-stage operational amplifier buffer unit, have fluctuation of process parameters in process implementation, generate an imbalance of a signal path, and if the imbalance signal is directly transmitted to an audio power amplifier, POP noise (POP) is easily output during audio playing, which causes bad auditory influence and feeling for users.

Disclosure of Invention

In view of the above, the present disclosure proposes a POP noise suppression device, a power amplifier, and an electronic apparatus to solve the above technical problems and suppress generation of POP noise.

According to a first aspect of the present disclosure, there is provided a POP noise suppression device applied in an audio power amplifier, the POP noise suppression device comprising:

at least one input for receiving an input signal;

the first branch circuit comprises a first resistor, and the output side of the first branch circuit is used for outputting processed signals;

and one end of the adjustable resistance component is connected with the input side of each first branch circuit, the other end of the adjustable resistance component is grounded or connected with the common-mode voltage, the resistance value of the adjustable resistance component is adjusted based on the received adjustment instruction, and the adjustment instruction is a digital signal or an analog signal which changes slowly.

In some possible embodiments, the adjustable resistance assembly comprises a variable resistance unit;

the variable resistance unit comprises a resistance matrix, wherein the resistance matrix comprises at least one adjustable resistor and a switch unit connected with each adjustable resistor;

the switch unit switches on or off the electrical connection of the corresponding adjustable resistor based on the adjustment instruction.

In some possible embodiments, the adjustable resistance assembly includes a plurality of variable resistance units, and the plurality of variable resistance units are respectively connected in parallel with the first branches in a one-to-one correspondence;

the variable resistance unit comprises a resistance matrix, wherein the resistance matrix comprises at least one resistor and a switch unit connected with each resistor;

the switching unit turns on or off the electrical connection of the corresponding resistance based on the adjustment instruction.

In some possible embodiments, the at least one input includes a first input for receiving a first input signal, and a second input for receiving a second input signal;

the adjustable resistive assembly includes a first variable resistive element and a second variable resistive element,

the circuit comprises two first branches, wherein the first variable resistance unit is connected with the first branches, and the second variable resistance unit is connected with the other first branch.

In some possible embodiments, the first resistance is an adjustable resistance and/or a fixed resistance.

In some possible embodiments, the adjustable resistance assembly includes at least one variable resistance unit, and the variable resistance unit includes at least one field effect transistor;

each variable resistance unit is connected with the corresponding first branch, and the first end of each field effect transistor is used for receiving the adjusting instruction.

In some possible embodiments, the adjustable resistance assembly includes a first variable resistance unit and a second variable resistance unit, the first variable resistance unit includes a first field effect transistor, and the second variable resistance unit includes a second field effect transistor;

the variable-resistance circuit comprises two first branches, wherein a first variable-resistance unit is connected with one first branch, and a second variable-resistance unit is connected with the other first branch.

According to a second aspect of the present disclosure, there is provided a power amplifier comprising:

the POP noise suppression device according to any one of the first aspect of the disclosure;

and the input side of the operational amplifier is connected with the output side of the POP noise suppression device, and the operational amplifier performs power amplification processing on the received signal to obtain an audio output signal.

According to a second aspect of the present disclosure, in some possible embodiments, the power amplifier further comprises:

a conversion unit for converting a digital signal corresponding to the audio signal into an analog signal;

and the output end of the conversion unit is connected with the input end of the POP noise suppression device.

According to a third aspect of the present disclosure, there is provided an electronic device configured as the power amplifier of any one of the second aspects of the present disclosure.

The embodiment of the disclosure slowly adjusts the resistance value of the adjustable resistor component through the adjusting instruction, thereby controlling the audio signal to slowly increase the offset signal output to the operational amplifier in the switching-in process, and slowly decrease the offset signal output to the operational amplifier in the switching-out process, thereby reducing the possibility of outputting POP noise during audio playing, and reducing the size of the output POP noise.

Other features and aspects of the present disclosure will become apparent from the following detailed description of exemplary embodiments, which proceeds with reference to the accompanying drawings.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate exemplary embodiments, features, and aspects of the disclosure and, together with the description, serve to explain the principles of the disclosure.

Fig. 1 illustrates a configuration diagram of a POP noise suppression device according to an embodiment of the present disclosure.

Fig. 2 illustrates a structural diagram of a variable resistance unit according to an embodiment of the present disclosure.

FIG. 3 illustrates a schematic diagram of a waveform of a conditioning instruction according to an embodiment of the present disclosure.

Fig. 4 illustrates a structure diagram of a POP noise suppression device according to an embodiment of the present disclosure.

Fig. 5 illustrates a structure diagram of a POP noise suppression device according to an embodiment of the present disclosure.

FIG. 6 shows a schematic diagram of an output waveform according to an embodiment of the present disclosure

Fig. 7 illustrates a structure diagram of a POP noise suppressing apparatus according to another embodiment of the present disclosure.

FIG. 8 illustrates a schematic diagram of a waveform of a conditioning instruction according to an embodiment of the present disclosure.

Fig. 9 shows a block diagram of a power amplifier according to an embodiment of the present disclosure.

Detailed Description

Various exemplary embodiments, features and aspects of the present disclosure will be described in detail below with reference to the accompanying drawings. In the drawings, like reference numbers can indicate functionally identical or similar elements. While the various aspects of the embodiments are presented in drawings, the drawings are not necessarily drawn to scale unless specifically indicated.

The word "exemplary" is used exclusively herein to mean "serving as an example, embodiment, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in this specification and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.

It is to be understood that although the terms first, second, third, etc. may be used herein to describe various information, these information should not be limited to these terms. These terms are only used to distinguish one type of information from another. For example, first information may also be referred to as second information, and similarly, second information may also be referred to as first information, without departing from the scope of the present invention. Depending on the warning, the word "if" as used herein may be understood as "at … …" or "when … …" or "in response to a determination" or the like.

Furthermore, in the following detailed description, numerous specific details are set forth in order to provide a better understanding of the present disclosure. It will be understood by those skilled in the art that the present disclosure may be practiced without some of these specific details. In some instances, methods, means, elements and circuits that are well known to those skilled in the art have not been described in detail so as not to obscure the present disclosure.

The POP noise suppression device of the embodiment of the disclosure can be applied to an audio power amplifier, and is used for suppressing generation of POP noise in the audio power amplifier, where the POP noise is a POP sound generated by transient impact caused by various operations at the moment of power-on and power-off of an audio device and after the power-on is stable, and for example, the POP noise is easily output when the audio device is started (a signal is switched into the audio device) and the audio device is powered off (a period of time can be set before and after the power-off as a signal switching-out process), and the POP noise is easily output when the audio is played.

Fig. 1 illustrates a configuration diagram of a POP noise suppression device according to an embodiment of the present disclosure. As shown in fig. 1, the POP noise suppressing apparatus includes:

at least one input (IN1, IN2) for receiving an input signal, such as an audio signal;

at least one first branch connected to the respective input terminals (IN1, IN2), the first branch comprising a first resistor (R1, R2), and an output side (OUT1) of the first branch for outputting the processed signal;

and an adjustable resistance component 300, one end of which is connected to the input side of each first branch, and the other end of which is grounded or common mode voltage, and which adjusts the resistance value of the adjustable resistance component based on a received adjustment instruction, where the adjustment instruction is a digital signal or an analog signal that changes gently.

In the implementation example of the present disclosure, there may be one or more input ends, and when there are one input ends, the audio signal may be directly received according to the one input end, or when there are a plurality of input ends, different input ends may be used to receive each audio signal, or different differential signals may also be received. Through the one end with adjustable resistance component and the connection of first branch input to and the other end ground connection, perhaps insert common mode voltage, and can make the signal on the first branch carry out mild change, effectual reduction range simultaneously according to the change of adjustable resistance component's resistance, thereby restrain the POP noise.

The configuration of the POP noise suppression device according to the embodiment of the present disclosure will be described in detail below, taking two input terminals as an example.

The embodiment shown IN fig. 1 comprises two input terminals, the input terminals comprise a first input terminal IN1 for receiving a first input signal and a second input terminal IN2 for receiving a second input signal, the adjustable resistor assembly 300 may comprise at least one variable resistor unit, each variable resistor unit may comprise a resistor matrix, the resistor matrix may comprise at least one resistor and a switch unit connected with each resistor, and the resistance of the variable resistor unit may be adjusted by adjusting the resistance of each resistor or adjusting the number of resistors connected into the circuit. When a variable resistance unit is included, each first branch may be connected to the variable resistance unit, that is, the variable resistance unit may simultaneously adjust the magnitude of signals transmitted through each first branch, thereby suppressing POP noise in each first branch. When a plurality of variable resistance units are included, each first branch may be connected to its corresponding variable resistance unit, that is, each variable resistance unit may be controlled separately to adjust the shunt in each first branch. In other words, in the embodiment of the present disclosure, each first branch may be connected to one variable resistance unit at the same time, or may be connected to different variable resistance units, for example, two input terminals correspond to two first branches, and one variable resistance unit is provided, and the variable resistance units may be connected to two first branches, respectively, and adjust the magnitude of the signal transmitted on the two first branches synchronously by adjusting the resistance value of the variable resistance unit, or two variable resistance units are provided, and a first variable resistance unit is connected to one of the two first branches, and a second variable resistance unit is connected to the other first branch, and the shunt signal on the first branch is adjusted by the connected variable resistance unit, so as to suppress POP noise on each first branch.

The following description will be made by taking fig. 1 as an example. The adjustable resistor assembly 300 may include a first variable resistor unit 310 and a second variable resistor unit 320, where the first variable resistor unit 310 is connected to the first branch 11, and the second variable resistor unit 320 is connected to the other first branch 12. Two of the first branches include resistors R1 and R2, respectively.

Specifically, since the first branch corresponds to the input terminal, two first branches are connected to the two input terminals, as shown IN fig. 1, the first input terminal IN1 corresponds to the first branch 11, and the second input terminal IN2 corresponds to the first branch 12. Wherein, the first branch 11 includes a first resistor R1, the first input signal IN1 can be transmitted backward through the first resistor R1 of the first branch 11, and the processed first output signal is output at the output terminal OUT 1; the first branch 12 includes a first resistor R2, and the second input signal IN2 may be transmitted backward through the first resistor R2 of the first branch 12, and output a processed second output signal at an output terminal OUT 2.

And, fig. 1 also shows an adjustable resistance component 300, which includes a first variable resistance unit 310 and a second variable resistance unit 320, wherein the first variable resistance unit 310 is connected to the input side of the first branch 11, that is, the first input signal may be transmitted in two paths, one is transmitted backward through the first resistor R1 of the first branch, and the other is transmitted backward through the first variable resistance unit 310, wherein the output side of the first variable resistance unit 310 is grounded or connected to a common mode voltage, and the first variable resistance unit 310 may further adjust the resistance value correspondingly through the received adjustment command Ctrl. Similarly, the second variable resistance unit 320 is connected to the input side of the first branch 12, that is, the second input signal may be transmitted in two paths, one of the two paths is transmitted backwards through the first resistor R2 of the first branch, and the other path is transmitted backwards through the first variable resistance unit 320, wherein the output side of the first variable resistance unit 320 is grounded or may be grounded through a fixed resistor, and the first variable resistance unit 320 may further adjust the resistance value of the resistor according to the received adjustment command Ctrl.

The disclosed embodiment also specifically provides an internal structure diagram of the variable resistance unit, as shown in fig. 2,

fig. 2 illustrates a structural diagram of a variable resistance unit according to an embodiment of the present disclosure, wherein the variable resistance unit includes a plurality of resistors and a switch unit connected to each resistor; and the switch unit controls the connection between each resistor and the first branch circuit to be switched on or switched off based on the adjusting instruction. The resistors in the variable resistor unit may be configured in a resistor matrix, the connection mode of the resistors may be a parallel connection mode as shown in fig. 2, and in other embodiments, the connection mode may be other connection modes as long as the resistance value of the variable resistor unit can be adjusted through an adjustment instruction, and the configuration mode in the variable resistor unit is not specifically limited in this disclosure, and the first resistor in the first branch may be a fixed resistor, and the first resistor may also be a variable resistor, for example, a resistor matrix as described above, and the magnitude of the signal output by the output end of the first branch is adjusted by adjusting the resistance values of the first resistor and the variable resistor unit simultaneously, as shown in fig. 3, and fig. 3 shows a structural diagram of the POP noise suppressing device according to an embodiment of the disclosure, where the first resistors R1 and R2 are variable resistors, the first variable resistor unit 310, the second variable resistor unit 310, and the third variable resistor unit are not specifically limited in this disclosure The second variable resistor unit 320 is also a variable resistor, and the first resistors R1 and R2 and the first and second variable resistor units adjust their respective resistance values by an adjustment command.

In other possible embodiments, the first branch may include a first sub-branch, a second sub-branch, a third sub-branch, and a fourth sub-branch, where the first sub-branch may be connected to the input terminal, the input terminal receives an offset signal, the first sub-branch includes a plurality of first resistors connected in series, a second sub-branch may be further connected between every two first resistors, the second sub-branch is a branch circuit of the first sub-branch, and the second sub-branch may be connected to third resistors, and a resistance value of each third resistor may be the same as or different from a resistance value of the first resistor, which is not specifically limited by this disclosure. In addition, each third resistor can be respectively connected with the third sub-branch and the fourth sub-branch through a change-over switch, each third resistor is connected with the third sub-branch through a first change-over switch, each third resistor is connected with the fourth sub-circuit through a second change-over switch, the output side of the third sub-branch is used for outputting the output signal of the first branch, the output side of the fourth sub-branch is grounded or connected with a fixed resistor and then grounded, and then connected with a common mode voltage.

The adjustable resistor assembly is configured to include the above switches, and the above switches control the on or off of each of the first switches S1, S2, …, Sn and the second switches S1b, S2b, …, Snb based on the received adjustment command, adjust the resistance value of the resistor connected to the circuit, so as to change the magnitude of the offset signal flowing through the first branch, and output the adjusted gently changed current or voltage signal through the third branch, where n represents the number of the switches, the first switching unit receives the first adjustment command, the second switching unit receives the second adjustment command, and the first adjustment command and the second adjustment command are opposite command signals, for example, the first adjustment command may be 1, and the second adjustment command may be 0.

The above-mentioned embodiment can be shown in fig. 4, and fig. 4 shows a structural diagram of a POP noise suppression device according to an embodiment of the present disclosure, which is a dual-input dual-output example, that is, the POP noise suppression device includes two first branches a and B, two output terminals OUT1, OUT2, and OUTC in fig. 4 is grounded, or OUTC may also be connected to a common mode voltage. And the magnitude of the signal output by each output end is adjusted by adopting a resistance type digital-to-analog converter RDAC, wherein the resistance value of the first resistor is R, and the resistance value of the second resistor is 2R.

As an example, the variable resistance unit shown in fig. 2 includes 5 adjustable resistors and 5 switch units corresponding to the 5 adjustable resistors, and the adjustment instruction may be a string of 5bit control words, where each character corresponds to one switch unit, 0 executes a close instruction and 1 executes an open instruction, and when the received adjustment instruction is 00011, the 5 switch units execute close, open, and open, respectively. Meanwhile, the adjustment instruction 00011 can also be regarded as a binary number, the number is 3 in decimal, then the number 3 can also be used as the adjustment instruction, for example, the received adjustment instruction is 7, and 7 is converted into binary number 00111, then 5 switch units respectively perform closing, opening and opening, wherein 0 character represents closing, and 1 character represents opening.

Meanwhile, to prevent the offset signal from being directly transmitted to the output of the operational amplifier, the embodiment of the present disclosure reduces the possibility of POP noise output by slowly limiting the magnitude of the offset signal transmitted to the operational amplifier, and suppresses the magnitude of POP noise of the output, which will be described in detail below.

As shown IN fig. 1, the terminal IN1 receives a first input signal, which is divided into two transmission paths during transmission, one of the two transmission paths is output to the first output terminal OUT1 through the first branch 11 to output a first output signal, and the other is output to the ground terminal OUTC through the first variable resistance unit 310, that is, the first variable resistance unit can function as a shunt, and if the resistance value of the first variable resistance unit is adjusted, the magnitude of the first output signal, for example, the magnitude of the current or the voltage of the first output signal, can be adjusted.

In the combined embodiment of fig. 1 and fig. 2, the value of the adjustment instruction may be set to be gradually increased along with the gradual cut-in of the audio signal, and the digital signal gradually decreased along with the gradual cut-out of the audio signal, that is, the adjustment instruction is a gently changing digital signal, as shown in fig. 5, and fig. 5 shows a schematic diagram of a waveform of the adjustment instruction according to an embodiment of the present disclosure, where an abscissa represents time and an ordinate represents the value of the adjustment instruction. As an example, when the audio signal is switched in gradually, the adjustment command may have binary numbers 00000, 00001, 00011, 00111, 01111, 11111, where 0 executes the close command and 1 executes the open command, and as can be seen from the structure of the variable resistance unit shown in fig. 2, when the variable resistance unit executes the adjustment command, the resistance value of the variable resistance unit is gradually increased, the effect of the shunt thereof is gradually decreased, and the first output signal is gradually increased. Finally, when the variable resistance unit receives 11111, the adjustable resistances are completely disconnected from the first branch, and the audio signal can be completely output. After the audio signal is switched in, the input audio signal can be directly output outwards through the output end of the first branch circuit without shunting of the variable resistance component. Fig. 6 is a schematic diagram showing an output waveform of a signal output by an operational amplifier after the output terminal of the embodiment of the POP noise suppression device is output to the operational amplifier according to an embodiment of the disclosure, wherein, the abscissa is time, the ordinate Voffset is the value of the voltage of the output signal, the signal switching-in process is performed in the time range of 0-t1, the signal switching-out process is performed in the time range from the time t2 to the time when the signal is finished to be output, and, the ellipses in fig. 6 represent that the input signal is not in the state of being switched in and out, after the signal is switched in and before the signal is switched out, the signal path is in the time range of normal working state, represented in fig. 6 as t1-t2, in which state the disclosed embodiments do not shunt the first branch using a variable resistance component.

Similarly, when the audio signal is cut out gradually, the adjustment command may be binary numbers 11111, 01111, 00111, 00011, 00001, and 00000, where 0 executes the close command and 1 executes the open command, and as can be seen from the structure of the variable resistor unit shown in fig. 2, when the variable resistor unit executes the adjustment command, the resistance value of the variable resistor unit is gradually decreased, the shunting effect of the variable resistor unit is gradually increased, and the first output signal is gradually decreased. Finally, when the variable resistance unit receives 00000, all the adjustable resistors are connected to the first branch, and at this time, the resistance value of the variable resistance unit has reached the minimum resistance value that it can reach (except for the resistance of 0), so that the purpose of largely shunting the input audio signal to the ground terminal is achieved, that is, the first output signal has already approached 0, and the output waveform of the first output signal can be shown in fig. 6.

Meanwhile, since the audio signal cut-in and cut-out times spent by different audio processing systems are different, the embodiment of the present disclosure does not particularly limit the length of time taken for the audio signal to be cut-in and cut-out.

In the above embodiment, the input signal is a dual-input signal, and in other possible implementations, the input signal may be a single-input signal, and then the embodiment of the present disclosure may use one input terminal to receive the signal and divide the signal into two transmission paths, one of which is transmitted backwards through the first branch, and the first branch may include a first resistor, one end of the first resistor receives the single-input signal, and the other end of the first resistor is connected to the output port to output the processed signal; the other path is transmitted backwards through an adjustable resistance component, the adjustable resistance component comprises a variable resistance unit, the output end of the adjustable resistance component is grounded, and meanwhile, the adjustable resistance component can correspondingly adjust the resistance value of the resistance through the received adjusting instruction.

As described above, the adjustable resistance assembly includes at least one variable resistance unit, where the variable resistance unit may be a resistance matrix formed by a plurality of resistors and corresponding switch units, and in other possible implementations, the present disclosure further provides another embodiment, where the variable resistance unit includes at least one field effect transistor; each variable resistance unit is connected with the corresponding first branch, and the first end of each field effect transistor is used for receiving the adjusting instruction, and the adjusting instruction can be a gently-changing analog signal.

In the following, a detailed description is given to another embodiment of the present disclosure by taking a dual input signal as an example, fig. 7 shows a structural diagram of a POP noise suppression device according to another embodiment of the present disclosure, as shown in fig. 7, the adjustable resistor component 300 includes a first variable resistor unit 330 and a second variable resistor unit 340, the first variable resistor unit 330 includes a first field effect transistor MN1, and the second variable resistor unit 340 includes a second field effect transistor MN 2; two first branches are included, the first variable resistance unit 330 is connected to one first branch 13, and the second variable resistance unit 340 is connected to the other first branch 14.

As shown IN fig. 7, the first input terminal IN1 receives a first input signal, the second input terminal IN2 receives a second input signal, wherein the first branch 13 includes a first resistor R1, the first input signal IN1 can be transmitted backward through the first resistor R1 of the first branch 13, and the processed first output signal is output at the output terminal OUT 1; the first branch 14 includes a first resistor R2, and the second input signal IN2 may be transmitted backward through the first resistor R2 of the first branch 14 and output a processed second output signal at an output terminal OUT 2.

And, fig. 7 also shows an adjustable resistance assembly 300 comprising a first variable resistance unit 330 and a second variable resistance unit 340, the first variable resistance unit 330 comprising a field effect transistor MN1, the second variable resistance unit 340 comprising a field effect transistor MN 2. The first variable resistance unit 330 is connected to the input side of the first branch 13, that is, the first input signal may be transmitted in two paths, one of the input signal is transmitted backward through the first resistor R1 of the first branch 13, and the other input signal is transmitted to the drain of the MN1 and is output from the source of the MN1, wherein the source of the MN1 is grounded, or the source of the MN1 may also be connected to another common mode voltage, and the gate of the MN1 may correspondingly adjust the equivalent on-resistance value of the MN1 through the received adjustment command Vctrl. Similarly, the second variable resistance unit 340 is connected to the input side of the first branch 14 or may be connected to ground through a fixed resistor, that is, the second input signal may be transmitted in two paths, one of the two paths is transmitted backwards through the first resistor R1 of the first branch 14, and the other path is transmitted to the drain of the MN2 and is output from the source of the MN2, wherein the source of the MN2 is connected to ground, and the gate of the MN2 may correspondingly adjust the equivalent on-resistance value of the MN2 through the received adjustment command Vctrl.

As shown in fig. 8, in the process of switching in and switching out signals, the equivalent resistance value of the field effect transistor needs to be adjusted by using the adjustment command, so as to change the magnitude of the signal output by the first branch, as an example, the adjustment manner may be that the gate-source voltage is slowly decreased in the process of switching in the input signals, and the gate-source voltage is slowly increased in the process of switching out the input signals. The maximum value of the gate-source voltage may be determined according to parameters of each component in the circuit and the size of the input signal, which is not specifically limited by the present disclosure.

Meanwhile, in the above embodiments, the variable resistance unit includes an N-type field effect transistor, where the drain is an input terminal, and the source is an output terminal, in other embodiments, the variable resistance unit may also be other types of field effect transistors, and the source may also be an input terminal, and the drain may also be an output terminal, and the variable resistance unit also includes a plurality of field effect transistors, and the connection manner between the plurality of field effect transistors may be a series connection or a parallel connection, as long as the resistance value of the variable resistance unit can be adjusted by an adjustment instruction, which is not limited in this disclosure, and is not listed here one by one.

In addition, an embodiment of the present disclosure further provides a power amplifier, for example, an audio power amplifier, which may employ the POP noise suppression device as described above, and fig. 9 shows a block diagram of a power amplifier according to an embodiment of the present disclosure, as shown in fig. 9, which includes:

the POP noise suppression device 1000 according to any of the above embodiments;

and an operational amplifier 2000 having an input side connected to an output side of the POP noise suppressing device, and performing power amplification processing on the received signal to obtain an audio output signal.

And, the power amplifier may further include:

a conversion unit 4000 for converting a digital signal corresponding to the audio signal into an analog signal, for example the conversion unit may be a digital-to-analog converter DAC. Wherein, the output end of the conversion unit is connected with the input end of the POP noise suppression device.

The power amplifier may further be connected to an external acoustic load device 5000 for playing audio.

Also, an embodiment of the present disclosure provides an electronic device configured as the power amplifier in each of the above embodiments. The power amplifier can be installed in any electronic device requiring audio processing, such as computers, mobile phones, stationary phones, stereos, music players, earphones, loudspeakers, and other electronic devices requiring audio power amplification, for example: messaging devices, game consoles, tablet devices, medical devices, fitness devices, personal digital assistants, etc., the disclosure of which is not intended to be limiting.

Having described embodiments of the present disclosure, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The terms used herein were chosen in order to best explain the principles of the embodiments, the practical application, or technical improvements to the techniques in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. A POP noise suppression device applied to an audio power amplifier is characterized by comprising:

at least one input for receiving an input signal;

2. The apparatus of claim 1, wherein the adjustable resistance component comprises a variable resistance unit;

3. The apparatus of claim 1, wherein the adjustable resistance component comprises a plurality of variable resistance units, and the plurality of variable resistance units are respectively connected in parallel with the first branches in a one-to-one correspondence;

4. The apparatus of claim 3, wherein the at least one input comprises a first input for receiving a first input signal, and a second input for receiving a second input signal;

5. The apparatus of claim 1, wherein the first resistance is an adjustable resistance and/or a fixed resistance.

6. The apparatus of claim 1, wherein the adjustable resistance component comprises at least one variable resistance unit, and the variable resistance unit comprises at least one field effect transistor;

7. The apparatus of claim 6, wherein the adjustable resistance component comprises a first variable resistance unit comprising a first field effect transistor and a second variable resistance unit comprising a second field effect transistor;

8. A power amplifier, comprising:

the POP noise suppressing device of any one of claims 1-7;

9. The power amplifier of claim 8, further comprising:

10. An electronic device configured as the power amplifier of claim 8 or 9.