CN106658298B - Bass enhancement processing circuit and terminal equipment - Google Patents
Bass enhancement processing circuit and terminal equipment Download PDFInfo
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- CN106658298B CN106658298B CN201710093798.2A CN201710093798A CN106658298B CN 106658298 B CN106658298 B CN 106658298B CN 201710093798 A CN201710093798 A CN 201710093798A CN 106658298 B CN106658298 B CN 106658298B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R3/00—Circuits for transducers, loudspeakers or microphones
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2430/00—Signal processing covered by H04R, not provided for in its groups
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Abstract
The application provides a bass boost treatment circuit and terminal equipment, wherein, this circuit includes: a low-pass filter, an amplifying network and an attenuating network; the input end of the low-pass filter is connected with the input end of the attenuation network and used for receiving audio signals; the output end of the low-pass filter is connected with the input end of the amplifying network; the output end of the amplifying network is connected with the output end of the attenuating network and used for outputting audio signals. Through utilizing low pass filter filtering high frequency signal to utilize amplifier network to carry out signal amplification to low frequency signal after, superpose with the audio signal after whole decay, realized strengthening the processing to the bass in the audio signal, analog signal is handled directly to bass strengthening processing, thereby reduced the influence of sampling and digital-to-analog conversion process to the audio signal quality, improved user experience, and circuit structure is simple, easily realizes, with low costs.
Description
Technical Field
The application relates to the technical field of electronics, in particular to a bass enhancement processing circuit and terminal equipment.
Background
According to the auditory characteristics of human ears, the lower the frequency of an audio signal is, the less easily the human ear feels, and the low-frequency component in the audio signal plays an important role in the auditory perception of a user and directly influences the flood brightness, fullness, thickness and spatial sense of sound. Therefore, how to enhance the bass in the audio signal is very important.
In the prior art, an analog audio signal is generally sampled, a Digital Signal Processing (DSP) technique is used to perform bass enhancement on the sampled digital audio signal, and the processed digital audio signal is converted into an analog audio signal through digital-to-analog conversion, so as to enhance the effect of bass in the audio signal.
The bass enhancement processing method needs to additionally increase an analog-digital sampling chip, a DSP processing chip, a digital-to-analog conversion chip and the like, has high cost and complex circuits, and can generate new noise and distortion in the sampling and digital-to-analog conversion processes, thereby influencing the quality of final audio signals and having poor user experience.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art.
Therefore, an object of the present invention is to provide a bass enhancement processing circuit, which implements enhancement processing on bass in an audio signal by filtering a high-frequency signal with a low-pass filter, amplifying a low-frequency signal with an amplification network, and then superimposing the low-frequency signal with an integrally attenuated audio signal, wherein the bass enhancement processing directly processes an analog signal, thereby reducing the influence of a sampling and digital-to-analog conversion process on the quality of the audio signal, improving user experience, and having a simple circuit structure, easy implementation, and low cost.
A second object of the present invention is to provide a terminal device.
In order to achieve the above object, an embodiment of the present invention provides a bass boost processing circuit, including: a low-pass filter, an amplifying network and an attenuating network;
the input end of the low-pass filter is connected with the input end of the attenuation network and used for receiving audio signals;
the output end of the low-pass filter is connected with the input end of the amplifying network;
the output end of the amplifying network is connected with the output end of the attenuating network and used for outputting audio signals.
The bass boost processing circuit that this application embodiment provided includes: a low-pass filter, an amplifying network and an attenuating network; the input end of the low-pass filter is connected with the input end of the attenuation network and used for receiving audio signals; the output end of the low-pass filter is connected with the input end of the amplifying network; the output end of the amplifying network is connected with the output end of the attenuating network and used for outputting audio signals. From this, through utilizing low pass filter filtering high frequency signal to utilize the amplifier network to carry out signal amplification to low frequency signal after, superpose with the audio signal after whole decay, realized strengthening the processing to the bass in the audio signal, analog signal is directly handled to bass strengthening the processing procedure, thereby reduced the influence of sampling and digital-to-analog conversion process to the audio signal quality, improved user experience, and circuit structure is simple, easily realizes, with low costs.
In addition, an embodiment of the present invention further provides a terminal device, including one or more of the following components: a circuit board, a housing, a processor, a memory, a power circuit, a bass boost processing circuit, and a communication assembly; wherein the circuit board is disposed inside a space enclosed by the housing, the processor, the memory, and the bass boost processing circuit being disposed on the circuit board; the power supply circuit is used for supplying power to each circuit or device of the terminal equipment; the memory is used for storing executable program codes; the processor executes a program corresponding to the executable program code by reading the executable program code stored in the memory;
the bass boost processing circuit includes: a low-pass filter, an amplifying network and an attenuating network;
the input end of the low-pass filter is connected with the input end of the attenuation network and used for receiving audio signals;
the output end of the low-pass filter is connected with the input end of the amplifying network;
the output end of the amplifying network is connected with the output end of the attenuating network and used for outputting audio signals.
In the terminal device provided in the embodiment of the present application, the bass boost processing circuit includes: a low-pass filter, an amplifying network and an attenuating network; the input end of the low-pass filter is connected with the input end of the attenuation network and used for receiving audio signals; the output end of the low-pass filter is connected with the input end of the amplifying network; the output end of the amplifying network is connected with the output end of the attenuating network and used for outputting audio signals. From this, through utilizing low pass filter filtering high frequency signal to utilize the amplifier network to carry out signal amplification to low frequency signal after, superpose with the audio signal after whole decay, realized strengthening the processing to the bass in the audio signal, analog signal is directly handled to bass strengthening the processing procedure, thereby reduced the influence of sampling and digital-to-analog conversion process to the audio signal quality, improved user experience, and circuit structure is simple, easily realizes, with low costs.
Drawings
The foregoing and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic diagram of a bass boost processing circuit according to an embodiment of the present application;
FIG. 2 is a schematic diagram of a bass boost processing circuit according to another embodiment of the present application;
FIG. 3 is a schematic diagram of a bass boost processing circuit according to another embodiment of the present application;
FIG. 4 is a schematic diagram of a bass boost processing circuit according to another embodiment of the present application;
FIG. 5 is a schematic diagram of a bass boost processing circuit according to another embodiment of the present application;
FIG. 6 is a schematic diagram of a bass boost processing circuit according to another embodiment of the present application;
fig. 7 is a schematic structural diagram of a terminal device according to an embodiment of the present application.
Description of reference numerals:
a low-pass filter-11; an amplification network-12; an attenuation network-13;
a high-pass filter-14; a gating network-15; a first resistance-R1;
a first capacitance-C1; a second capacitance-C2; a third capacitance-C3;
a second resistance-R2; a third resistor-R3; a fourth resistor-R4;
a fifth resistor-R5; a sixth resistor-R6; a seventh resistor-R7;
an eighth resistance-R8; an operational amplifier-U1; an impedance matching network-16;
matching resistance-R; a circuit board-71; a housing-72;
a processor-73; a memory-74; -a power supply circuit-75;
bass boost processing circuitry-76; a communication component-77.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
Specifically, each embodiment of the present application is directed to the existing bass enhancement processing method, because an analog-to-digital sampling chip, a DSP processing chip, a digital-to-analog conversion chip, etc. needs to be additionally added, the cost is high, the circuit is complex, and in the process of sampling and digital-to-analog conversion, new noise and distortion may be generated, which affects the quality of the final audio signal, and the problem of poor user experience is solved.
A bass enhancement processing circuit and a terminal apparatus proposed according to an embodiment of the present invention are described below with reference to the drawings.
Fig. 1 is a schematic structural diagram of a bass boost processing circuit according to an embodiment of the present application.
As shown in fig. 1, a bass boost processing circuit includes: a low-pass filter 11, an amplifying network 12 and an attenuating network 13;
wherein, the input end of the low-pass filter 11 is connected with the input end of the attenuation network 13 for receiving the audio signal;
the output end of the low-pass filter 11 is connected with the input end of the amplifying network 12;
the output end of the amplifying network 12 is connected with the output end of the attenuating network 13, and is used for outputting audio signals.
Specifically, the attenuation network 13 may be a pi-type attenuation network composed of a plurality of resistors, a T-type attenuation network, or other various types of attenuation networks, and is not limited herein.
It is understood that the low pass filter may allow signals below its cut-off frequency to pass through, and therefore, in the embodiment of the present application, in order to enhance bass in the audio signal, the characteristic of the low pass filter 11 may be utilized to filter out a high frequency signal of the audio signal, amplify the obtained low frequency signal, and finally superimpose the amplified low frequency signal with the entire audio signal, so as to obtain an audio signal enhanced by the bass signal.
Specifically, the audio signal can be divided into two paths, wherein one path is filtered by a low-pass filter 11 to remove high-frequency signals, and is amplified by an amplifying network 12 to obtain amplified low-frequency signals; the other path is attenuated by an attenuation network 13 to obtain audio signals with high-frequency signals and low-frequency signals both attenuated and the attenuation times of the audio signals are the same, and the amplified low-frequency signals and the attenuated audio signals are superposed. In the embodiment of the present application, when the whole audio signal of one audio signal is attenuated, the low frequency signal and the high frequency signal in the audio signal are attenuated to the same degree, and the low frequency signal obtained after being filtered by the low pass filter 11 in the other audio signal is amplified, so that the proportion of the low frequency signal in the superimposed audio signal is increased compared with the original audio signal, thereby enhancing the bass.
The bass boost processing circuit that this application embodiment provided includes: a low-pass filter, an amplifying network and an attenuating network; the input end of the low-pass filter is connected with the input end of the attenuation network and used for receiving audio signals; the output end of the low-pass filter is connected with the input end of the amplifying network; the output end of the amplifying network is connected with the output end of the attenuating network and used for outputting audio signals. From this, through utilizing low pass filter filtering high frequency signal to utilize the amplifier network to carry out signal amplification to low frequency signal after, superpose with the audio signal after whole decay, realized strengthening the processing to the bass in the audio signal, analog signal is directly handled to bass strengthening the processing procedure, thereby reduced the influence of sampling and digital-to-analog conversion process to the audio signal quality, improved user experience, and circuit structure is simple, easily realizes, with low costs.
By the analysis, the low-frequency signal obtained by dividing the frequency of the audio signal can be amplified and then superposed with the audio signal after overall attenuation to obtain the bass-enhanced audio signal. In practical application, because there is a difference in hearing between users, the audio signal formed by overlapping the overall attenuated audio signal and the amplified low-frequency signal may not satisfy the hearing feeling of some users, so in a possible implementation form of the present application, the high-frequency signal in the audio signal may be attenuated to a certain degree according to the selection of the user, and then overlapped with the amplified low-frequency signal, so that the bass enhancement degree of the obtained audio signal satisfies the needs of the users. That is, the bass boost processing circuit provided in the present application, as shown in fig. 2, may further include: a high pass filter 14.
Specifically, an input end of the high-pass filter 14 is connected to an input end of the low-pass filter 11, and an output end of the high-pass filter 14 is connected to an input end of the attenuation network 13.
The high pass filter 14 may be a capacitor, an RC circuit, etc., and is not limited herein.
In the concrete implementation, after the audio signal is divided into two paths, one path is filtered by a low-pass filter 11 to remove high-frequency signals, and is amplified by an amplifying network 12 to obtain amplified low-frequency signals; the other path of the low-frequency signal is filtered by a high-pass filter 14, attenuated by an attenuation network 13 to obtain an attenuated high-frequency signal, and the attenuated high-frequency signal and the amplified low-frequency signal are superposed. In the embodiment of the application, the obtained low-frequency signal is amplified and simultaneously the obtained high-frequency signal is attenuated, so that the superposed audio signal is compared with the original audio signal, the proportion of the low-frequency signal is increased, bass is enhanced, and compared with the attenuation of the whole audio signal, only the high-frequency signal in the audio signal is attenuated, so that the bass enhancement degree is higher, and the requirements of users are better met.
It should be noted that, in the embodiment of the present application, after the audio signal is divided into two paths, one path of audio signal may also be amplified first, then the low-pass filter 11 filters out the high-frequency signal, the other path of audio signal is attenuated by the attenuation network 13, then the high-pass filter 14 filters out the low-frequency signal, and finally the low-frequency signal is superimposed to the audio signal with bass enhancement. The specific circuit connection relationship is not described herein.
Further, the bass enhancement processing circuit provided by the present application may also enable a user to select to attenuate the entire audio signal or only the high frequency signal according to the requirement, that is, in the bass enhancement processing circuit provided by the present application, as shown in fig. 2, a gating network 15 may also be included.
Wherein, the first input end of the gating network 15 is connected with the input ends of the low-pass filter 11 and the high-pass filter 14;
a second input of the gating network 15 connected to the output of the high-pass filter 14;
the output terminal of the gating network 15 is connected to the input terminal of the attenuation network 13, and the gating network is used for controlling the connection of the first input terminal or the second input terminal to the output terminal of the gating network 15 according to the control signal.
Specifically, the gating network 15 may include any one of the following devices: a single-pole double-throw switch and a gating device, and a gating network 15 is shown as the single-pole double-throw switch in fig. 2.
It can be understood that, taking the gating network 15 as a single-pole double-throw switch as an example, when a moving contact of the single-pole double-throw switch is contacted with a contact of a first input end, the first input end of the gating network 15 is connected with an output end, at this time, an input audio signal is directly subjected to overall attenuation through the attenuation network 13, and then is superposed with an amplified low-frequency signal to obtain a bass-enhanced audio signal; when the moving contact of the single-pole double-throw switch contacts with the contact of the second input end, the second input end of the gating network 15 is connected with the output end, and at the moment, the input audio signal is filtered by the high-pass filter 14 and then attenuated by the attenuation network 13, namely, only the high-frequency signal in the audio signal is attenuated, so that the bass-enhanced audio signal is obtained. Therefore, the gating network 15 can control the connection of the first input end or the second input end with the output end of the gating network 15 according to the control signal input by the control end, so as to control the attenuation of the whole audio signal or only the attenuation of the high-frequency signal.
During specific implementation, a button can be arranged on the terminal device to control to attenuate the whole audio signal or only attenuate the high-frequency signal, and a user can press the button or press different buttons with different forces as required to generate a corresponding control signal, so that the output end of the gating network 15 can be connected with the first input end or the second input end according to the control signal input by the control end, and further control to attenuate the whole audio signal or only attenuate the high-frequency signal.
The configuration of the bass boost processing circuit proposed in the present application is explained in the above embodiments, and each part constituting the bass boost processing circuit in the embodiments of the present application is specifically explained below with reference to the drawings.
Fig. 3 is a schematic structural diagram of a bass boost processing circuit according to another embodiment of the present application.
As shown in fig. 3, the low pass filter 11 may include a first resistor R1 and a first capacitor C1.
One end of the first resistor R1 is connected to the input end of the attenuation network 13, and the other end of the first resistor R1 is connected to one end of the first capacitor C1 and the input end of the amplification network 12;
the other end of the first capacitor C1 is connected to ground.
It should be noted that the drawings referred to in this application are schematic illustrations and are intended to illustrate the application and should not be construed as limiting the application.
Specifically, since the cutoff frequency of the low-pass filter 11 composed of the first resistor R1 and the first capacitor C1 is 1/(R1 × C1), signals higher than the cutoff frequency 1/(R1 × C1) can be filtered out by the low-pass filter 11 composed of the first resistor R1 and the first capacitor C1, and signals lower than the cutoff frequency 1/(R1 × C1) can be obtained.
It can be understood that, in practical applications, because the audio frequency range of the audio signal is various, for example, the audio frequency range of the audio signal may generally include a plurality of frequency bands, such as a low frequency band, a medium frequency band, a high frequency band, and the like, and the cutoff frequency of the low-pass filter 11 composed of the first resistor R1 and the first capacitor C1 is constant, so that the sound quality of the low-frequency signal obtained after being filtered by the low-pass filter 11 composed of the first resistor R1 and the first capacitor C1 may be relatively thin, and lack of thickness and sense of space. That is, as shown in fig. 4, in the bass enhancement processing circuit provided in the embodiment of the present application, the low-pass filter 11 may further include a second capacitor C2, a third capacitor C3, and a second resistor R2.
One end of the second capacitor C2 is connected to one end of the first capacitor C1 and the other end of the first resistor R1, and the other end of the second capacitor C2 is connected to one end of the third capacitor C3 and the output end of the amplifying network 12;
the other end of the third capacitor C3 is connected to the other end of the first capacitor C1 and one end of the second resistor R2;
the other end of the second resistor R2 is connected to ground.
In addition, as shown in fig. 5, the amplifying network 12 may specifically include: a third resistor R3, a fourth resistor R4, an operational amplifier U1 and a fifth resistor R5.
The fifth resistor R5 may be a fixed resistor, a variable resistor, or the like. Fig. 5 shows that the fifth resistor R5 is a fixed resistor.
Specifically, one end of the third resistor R3 is connected to the output end of the low-pass filter 11, and the other end of the third resistor R3 is connected to the positive input end of the operational amplifier U1;
one end of the fourth resistor R4 is connected with the ground, and the other end of the fourth resistor R4 is connected with the negative input end of the operational amplifier U1 and one end of the fifth resistor R5;
the other end of the fifth resistor R5 is connected to the output of the operational amplifier U1 and the output of the attenuator network 13.
It is understood that if the current flowing through the fourth resistor R4 is I, the voltage U —, at the negative input end of the operational amplifier U1 is the voltage I × R4 across the fourth resistor R4, and the current flowing through the fifth resistor R5 is equal to the current flowing through the fourth resistor R4 due to the "virtual off" characteristic of the operational amplifier U1, so that the output terminal voltage UO of the operational amplifier U1 is the voltage across the fourth resistor R4 and the fifth resistor R5, i.e., UO ═ I (R4+ R5), and further, due to the "virtual short" characteristic of the operational amplifier U1, the negative input terminal voltage U — (U — of the operational amplifier U1 is equal to the positive input terminal voltage U +, I ═ R4, and therefore, the amplification factor of the operational amplifier U1 is (R4+ R5)/R4. After the high frequency signal is filtered by the low pass filter 11, the obtained low frequency signal is amplified by the amplifying network 12 to (R4+ R5)/R4 times.
In the embodiment of the present application, when the fifth resistor R5 is a variable resistor, the amplification factor of the amplifying network 12 varies with the variation of the fifth resistor R5, so by adjusting the resistance of the fifth resistor R5, the intensity of bass enhancement can be adjusted.
In addition, in order to control the amplification factor of the amplifying network 12 more precisely, in the embodiment of the present application, as shown in fig. 6, a sixth resistor R6 may be further included.
One end of the sixth resistor R6 is connected to the other end of the third resistor R3, and the other end of the sixth resistor R6 is connected to ground.
It can be understood that, since the third resistor R3 is connected to the ground through the sixth resistor R6, the voltage at the positive input end of the operational amplifier U1 is the voltage division value of the low-frequency signal output by the low-pass filter 11 on the sixth resistor R6, and therefore, the attenuation of the low-frequency signal output by the low-pass filter 11 can be realized through the resistor voltage division.
According to the embodiment of the application, the sixth resistor R6 is arranged, so that the low-frequency signal output by the low-pass filter 11 can be attenuated, and then amplified by the operational amplifier U1, and therefore, the amplification factor of the amplification network 12 can be controlled more accurately, and the degree of bass enhancement in the audio signal can be controlled more accurately.
In this case, the voltage at the positive input terminal of the operational amplifier U1 is a voltage division value of the low frequency signal output by the low pass filter 11 between the sixth resistor R6 and the second resistor R2.
In addition, in order to achieve maximum transmission of power, in the bass boost processing circuit provided in the embodiment of the present application, as shown in fig. 6, an impedance matching network 16 may be further included to achieve impedance matching.
Specifically, an input end of the impedance matching network 16 is connected to an output end of the amplifying network 12, and an output end of the impedance matching network 16 is connected to an output end of the attenuating network 13.
The impedance matching network 16 may be composed of matching resistors. The impedance matching network 16 is illustrated in fig. 6 as including a matching resistor R.
It should be noted that, a resistor may be provided at a suitable position in the bass boost processing circuit provided in the embodiment of the present application as needed to implement impedance matching of the circuit.
In addition, as shown in fig. 6, the attenuation network 13 may specifically include a seventh resistor R7 and an eighth resistor R8.
One end of the seventh resistor R7 is connected to the input end of the low-pass filter 11, and the other end of the seventh resistor R7 is connected to one end of the eighth resistor R8 and the output end of the amplifying network 12;
the other end of the eighth resistor R8 is connected to ground.
Specifically, since the seventh resistor R7 is connected to ground through the eighth resistor R8, the voltage value output by the attenuation network 13 is the voltage division value of the voltage of the input audio signal across the eighth resistor R8, and the overall attenuation of the audio signal can be realized through the resistor division.
It should be noted that in the embodiment of the present application, any one of the resistors may be a series or parallel connection of a plurality of resistors, for example, the seventh resistor R7 shown in fig. 6 may be formed by two resistors connected in series, and the eighth resistor R8 may be formed by two resistors connected in parallel. Accordingly, in the embodiment of the present application, any one of the capacitors may be a series connection or a parallel connection of a plurality of capacitors, for example, the third capacitor C3 shown in fig. 6 may be formed by two capacitors connected in parallel.
The bass boost processing circuit that this application embodiment provided includes: a low-pass filter, an amplifying network and an attenuating network; the input end of the low-pass filter is connected with the input end of the attenuation network and used for receiving audio signals; the output end of the low-pass filter is connected with the input end of the amplifying network; the output end of the amplifying network is connected with the output end of the attenuating network and used for outputting audio signals. From this, through utilizing low pass filter filtering high frequency signal to utilize the amplifier network to carry out signal amplification to low frequency signal after, superpose with the audio signal after whole decay, realized strengthening the processing to the bass in the audio signal, analog signal is directly handled to bass strengthening the processing procedure, thereby reduced the influence of sampling and digital-to-analog conversion process to the audio signal quality, improved user experience, and circuit structure is simple, easily realizes, with low costs. And the high-pass filter is utilized to filter the low-frequency signal of the audio signal and then attenuate the low-frequency signal, so that the bass of the audio signal is enhanced to different degrees, the requirements of users are met, and the user experience is improved.
In order to implement the above embodiments, the present application further provides a terminal device.
Fig. 7 is a schematic structural diagram of a terminal device according to an embodiment of the present application.
As shown in fig. 7, the terminal device includes one or more of the following components: circuit board 71, housing 72, processor 73, memory 74, power supply circuitry 75, bass boost processing circuitry 76, and communications assembly 77.
Wherein the circuit board 71 is disposed inside a space enclosed by the housing 72, and the processor 73, the memory 74 and the bass boost processing circuit 76 are disposed on the circuit board 71; the power circuit 75 is configured to supply power to each circuit or device of the terminal device; the memory 74 is used for storing executable program code; the processor 73 executes a program corresponding to the executable program code by reading the executable program code stored in the memory 74;
wherein the bass boost processing circuit 76 comprises: a low-pass filter, an amplifying network and an attenuating network;
the input end of the low-pass filter is connected with the input end of the attenuation network and used for receiving audio signals;
the output end of the low-pass filter is connected with the input end of the amplifying network;
the output end of the amplifying network is connected with the output end of the attenuating network and used for outputting audio signals.
It should be noted that the foregoing explanation of the bass boost processing circuit embodiment also applies to the terminal device of this embodiment, and the implementation principle thereof is similar and will not be described herein again.
In addition, fig. 7 illustrates a terminal device as a mobile phone, and it can be understood that the terminal device provided in the embodiment of the present application may be not only a mobile phone, but also other devices with an audio playing function, such as a computer and a television.
In the terminal device provided in the embodiment of the present application, the bass boost processing circuit includes: a low-pass filter, an amplifying network and an attenuating network; the input end of the low-pass filter is connected with the input end of the attenuation network and used for receiving audio signals; the output end of the low-pass filter is connected with the input end of the amplifying network; the output end of the amplifying network is connected with the output end of the attenuating network and used for outputting audio signals. From this, through utilizing low pass filter filtering high frequency signal to utilize the amplifier network to carry out signal amplification to low frequency signal after, superpose with the audio signal after whole decay, realized strengthening the processing to the bass in the audio signal, analog signal is directly handled to bass strengthening the processing procedure, thereby reduced the influence of sampling and digital-to-analog conversion process to the audio signal quality, improved user experience, and circuit structure is simple, easily realizes, with low costs.
In the description of the present invention, it is to be understood that the terms "area", "width", "circumferential" and the like indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
In the present invention, unless otherwise explicitly specified or limited, the terms "disposed," "connected," and the like are to be construed broadly, e.g., as meaning mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in M embodiments or examples of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (9)
1. A bass enhancement processing circuit, comprising: a low-pass filter, an amplifying network and an attenuating network;
the input end of the low-pass filter is connected with the input end of the attenuation network and used for receiving audio signals;
the output end of the low-pass filter is connected with the input end of the amplifying network;
the output end of the amplifying network is connected with the output end of the attenuating network and used for outputting audio signals;
the attenuation network is a pi-shaped attenuation network, a T-shaped attenuation network or any other type of attenuation network consisting of a plurality of resistors;
the circuit further comprises a high pass filter and a gating network;
the input end of the high-pass filter is connected with the input end of the low-pass filter, and the output end of the high-pass filter is connected with the input end of the attenuation network;
the first input end of the gating network is connected with the input ends of the low-pass filter and the high-pass filter;
the second input end of the gating network is connected with the output end of the high-pass filter;
the output end of the gating network is connected with the input end of the attenuation network, and the gating network is used for controlling the connection of the first input end or the second input end with the output end of the gating network according to a control signal.
2. The circuit of claim 1, wherein the low pass filter comprises a first resistor and a first capacitor;
one end of the first resistor is connected with the input end of the attenuation network, and the other end of the first resistor is connected with one end of the first capacitor and the input end of the amplification network;
the other end of the first capacitor is connected with the ground.
3. The circuit of claim 2, wherein the low pass filter further comprises: a second capacitor, a third capacitor and a second resistor;
one end of the second capacitor is connected with one end of the first capacitor and the other end of the first resistor, and the other end of the second capacitor is connected with one end of the third capacitor and the output end of the amplifying network;
the other end of the third capacitor is connected with the other end of the first capacitor and one end of the second resistor;
the other end of the second resistor is connected to ground.
4. A circuit as claimed in any one of claims 1 to 3, wherein said amplifying network comprises: the circuit comprises a third resistor, a fourth resistor, an operational amplifier and a fifth resistor;
one end of the third resistor is connected with the output end of the low-pass filter, and the other end of the third resistor is connected with the positive input end of the operational amplifier;
one end of the fourth resistor is connected with the ground, and the other end of the fourth resistor is connected with the negative input end of the operational amplifier and one end of the fifth resistor;
the other end of the fifth resistor is connected with the output end of the operational amplifier and the output end of the attenuation network.
5. The circuit of claim 4, wherein the fifth resistor is a variable resistor.
6. The circuit of claim 4, further comprising: a sixth resistor;
one end of the sixth resistor is connected with the other end of the third resistor, and the other end of the sixth resistor is connected with the ground.
7. The circuit of any of claims 1-3, further comprising: an impedance matching network;
the input end of the impedance matching network is connected with the output end of the amplifying network, and the output end of the impedance matching network is connected with the output end of the attenuation network.
8. The circuit of any of claims 1-3, wherein the attenuation network comprises: a seventh resistor and an eighth resistor;
one end of the seventh resistor is connected with the input end of the low-pass filter, and the other end of the seventh resistor is connected with one end of the eighth resistor and the output end of the amplifying network;
the other end of the eighth resistor is connected with the ground.
9. A terminal device, comprising one or more of the following components: a circuit board, a housing, a processor, a memory, a power circuit, a bass boost processing circuit, and a communication assembly; wherein the circuit board is disposed inside a space enclosed by the housing, the processor, the memory, and the bass boost processing circuit being disposed on the circuit board; the power supply circuit is used for supplying power to each circuit or device of the terminal equipment; the memory is used for storing executable program codes; the processor executes a program corresponding to the executable program code by reading the executable program code stored in the memory;
the bass boost processing circuit includes:
a low-pass filter, an amplifying network and an attenuating network;
the input end of the low-pass filter is connected with the input end of the attenuation network and used for receiving audio signals;
the output end of the low-pass filter is connected with the input end of the amplifying network;
the output end of the amplifying network is connected with the output end of the attenuating network and used for outputting audio signals;
the attenuation network is a pi-shaped attenuation network, a T-shaped attenuation network or any other type of attenuation network consisting of a plurality of resistors;
the circuit further comprises a high pass filter and a gating network;
the input end of the high-pass filter is connected with the input end of the low-pass filter, and the output end of the high-pass filter is connected with the input end of the attenuation network;
the first input end of the gating network is connected with the input ends of the low-pass filter and the high-pass filter;
the second input end of the gating network is connected with the output end of the high-pass filter;
the output end of the gating network is connected with the input end of the attenuation network, and the gating network is used for controlling the connection of the first input end or the second input end with the output end of the gating network according to a control signal.
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| CN107231599A (en) * | 2017-06-08 | 2017-10-03 | 北京奇艺世纪科技有限公司 | A kind of 3D sound fields construction method and VR devices |
| CN108235184B (en) * | 2018-01-17 | 2020-08-28 | 潍坊歌尔电子有限公司 | Bass enhancement circuit and audio playing equipment |
| CN111856152A (en) * | 2020-07-28 | 2020-10-30 | 哈尔滨工业大学 | Pulse signal sampling method and device |
| CN112637741B (en) * | 2020-12-30 | 2023-03-10 | 广州酷狗计算机科技有限公司 | Audio signal processing method, device, chip, electronic equipment and storage medium |
| CN115549602A (en) * | 2022-10-25 | 2022-12-30 | 合肥本源量子计算科技有限责任公司 | Low noise amplifier circuit, low noise amplifier and quantum computer |
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