CN106658299B - Audio processing circuit and terminal equipment - Google Patents
Audio processing circuit and terminal equipment Download PDFInfo
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- CN106658299B CN106658299B CN201710094636.0A CN201710094636A CN106658299B CN 106658299 B CN106658299 B CN 106658299B CN 201710094636 A CN201710094636 A CN 201710094636A CN 106658299 B CN106658299 B CN 106658299B
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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
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Abstract
The application provides an audio frequency processing circuit and terminal equipment, wherein, this circuit includes: a low pass filter, a first attenuation network and a high pass filter; the input end of the low-pass filter is connected with the input end of the first attenuation network and used for receiving an audio signal; the output end of the first attenuation network is connected with the input end of the high-pass filter; and the output end of the high-pass filter is connected with the output end of the low-pass filter and used for outputting audio signals. The low-pass filter and the high-pass filter are used for frequency division, the high-frequency signals after frequency division are subjected to signal attenuation by the first attenuation network and then are superposed with the low-frequency signals after frequency division, bass in the audio signals is enhanced, and analog signals are directly processed in the audio processing process, so that the influence of the sampling and digital-analog conversion process on the quality of the audio signals is reduced, the user experience is improved, and the circuit is simple in structure, easy to implement and low in cost.
Description
Technical Field
The application relates to the technical field of electronics, in particular to an audio processing circuit and a terminal device.
Background
With the development of computer and multimedia technology, multimedia devices are gradually miniaturized and lightened, and the size of speakers in the multimedia devices is also limited. The low frequency reproduction capability of small loudspeakers is poor due to the volume limitations of the loudspeakers. However, low frequency components in audio play an important role in the auditory perception of the user, directly affecting the sound's fullness, thickness and spatial perception. Therefore, how to improve the bass effect of the multimedia device is very important.
In the prior art, after an analog audio signal is sampled into a digital audio signal, a Digital Signal Processing (DSP) technique is used to perform bass enhancement on the digital audio signal, and then the processed digital audio signal is converted into an analog audio signal through digital-to-analog conversion, so as to enhance the bass effect.
The audio processing method needs to additionally add an analog-digital sampling chip, a DSP processing chip, a digital-to-analog conversion chip and the like, so that the cost is high, the circuit is complex, new noise and distortion can be generated in the sampling and digital-to-analog conversion processes, the quality of the final audio signal is influenced, and the user experience is poor.
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 an audio processing circuit, which performs frequency division by using a low-pass filter and a high-pass filter, performs signal attenuation on a frequency-divided high-frequency signal by using a first attenuation network, and then superimposes the frequency-divided high-frequency signal with a frequency-divided low-frequency signal, so as to enhance bass in the audio signal, and the audio 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.
To achieve the above object, an audio processing circuit according to an embodiment of the present invention includes: a low pass filter, a first attenuation network and a high pass filter;
the input end of the low-pass filter is connected with the input end of the first attenuation network and used for receiving an audio signal;
the output end of the first attenuation network is connected with the input end of the high-pass filter;
and the output end of the high-pass filter is connected with the output end of the low-pass filter and used for outputting audio signals.
The audio processing circuit provided by the embodiment of the application comprises: a low pass filter, a first attenuation network and a high pass filter; the input end of the low-pass filter is connected with the input end of the first attenuation network and used for receiving an audio signal; the output end of the first attenuation network is connected with the input end of the high-pass filter; and the output end of the high-pass filter is connected with the output end of the low-pass filter and used for outputting audio signals. Therefore, the low-pass filter and the high-pass filter are used for frequency division, the high-frequency signals after frequency division are subjected to signal attenuation by the first attenuation network and then are superposed with the low-frequency signals after frequency division, bass enhancement processing in the audio signals is realized, and analog signals are directly processed in the audio processing process, so that the influence of the sampling and digital-to-analog conversion process on the quality of the audio signals is reduced, the user experience is improved, and the circuit is simple in structure, easy to implement and low in cost.
In addition, an embodiment of the present invention further provides a terminal device, including one or more of the following components: the audio device comprises a circuit board, a shell, a processor, a memory, a power circuit, an audio 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 audio 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 audio processing circuit comprises: a low pass filter, a first attenuation network and a high pass filter;
the input end of the low-pass filter is connected with the input end of the first attenuation network and used for receiving an audio signal;
the output end of the first attenuation network is connected with the input end of the high-pass filter;
and the output end of the high-pass filter is connected with the output end of the low-pass filter and used for outputting audio signals.
In the terminal device provided in the embodiment of the present application, the audio processing circuit includes: a low pass filter, a first attenuation network and a high pass filter; the input end of the low-pass filter is connected with the input end of the first attenuation network and used for receiving the audio signal; the output end of the first attenuation network is connected with the input end of the high-pass filter; the output end of the high-pass filter is connected with the output end of the low-pass filter and used for outputting the audio signal. Therefore, the low-pass filter and the high-pass filter are used for frequency division, the high-frequency signals after frequency division are subjected to signal attenuation by the first attenuation network and then are superposed with the low-frequency signals after frequency division, bass enhancement processing in the audio signals is realized, and analog signals are directly processed in the audio processing process, so that the influence of the sampling and digital-to-analog conversion process on the quality of the audio signals is reduced, the user experience is improved, and the circuit is simple in structure, easy to implement and low in cost.
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 an audio processing circuit according to an embodiment of the present application;
FIG. 2 is a schematic diagram of an audio processing circuit according to another embodiment of the present application;
FIG. 3 is a schematic diagram of an audio processing circuit according to another embodiment of the present application;
FIG. 4 is a schematic diagram of an audio processing circuit according to another embodiment of the present application;
FIG. 5 is a schematic diagram of an audio processing circuit according to another embodiment of the present application;
FIG. 6 is a schematic diagram of an audio 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; a first attenuation network-12; a high-pass filter-13;
a second attenuation network-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;
a circuit board-71; a housing-72; a processor-73;
a memory-74; -a power supply circuit-75; an audio processing circuit-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, the embodiments of the present application provide an audio processing method that divides an analog audio signal into two paths, one path filters out low frequency and attenuates high frequency, the other path filters out high frequency and selectively attenuates low frequency, the audio processing process is to directly process the analog signal, the influence of the sampling and digital-to-analog conversion process on the quality of the audio signal is reduced, and the circuit structure is simple, easy to implement and low in cost.
An audio processing circuit and a terminal device 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 an audio processing circuit according to an embodiment of the present application.
As shown in fig. 1, an audio processing circuit includes: a low-pass filter 11, a first attenuation network 12 and a high-pass filter 13;
wherein an input of the low-pass filter 11 is connected to an input of the first attenuation network 12 for receiving an audio signal;
the output of the first attenuator network 12 is connected to the input of the high-pass filter 13;
the output of the high pass filter 13 is connected to the output of the low pass filter 11 for outputting an audio signal.
Specifically, the first attenuation network 12 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 the high pass filter may allow signals above its cut-off frequency to pass through, so in the embodiment of the present application, in order to enhance bass in the audio signal, the audio signal may be divided by using the characteristics of the low pass filter 11 and the high pass filter 13 to obtain a low frequency signal and a high frequency signal, respectively, and then the obtained low frequency signal and high frequency signal are processed respectively, and finally superimposed to form an audio signal enhanced by the bass signal.
Specifically, the audio signal may be divided into two paths, one path of which is attenuated by the first attenuation network 12, and the low-frequency signal is filtered by the high-pass filter 13 to obtain an attenuated high-frequency signal; the other path of the signal is filtered by a low-pass filter 11 to obtain a non-attenuated low-frequency signal, and the attenuated high-frequency signal and the non-attenuated low-frequency signal are superposed. Because the power of the high-frequency signal and the low-frequency signal in the audio signal is relative, and the high-frequency signal is attenuated in the embodiment of the application, and the low-frequency signal is not attenuated, the audio signal after superposition is compared with the original audio signal, the proportion of the low-frequency signal is increased, and therefore the bass is enhanced.
The audio processing circuit provided by the embodiment of the application comprises: a low pass filter, a first attenuation network and a high pass filter; the input end of the low-pass filter is connected with the input end of the first attenuation network and used for receiving an audio signal; the output end of the first attenuation network is connected with the input end of the high-pass filter; and the output end of the high-pass filter is connected with the output end of the low-pass filter and used for outputting audio signals. Therefore, the low-pass filter and the high-pass filter are used for frequency division, the high-frequency signals after frequency division are subjected to signal attenuation by the first attenuation network and then are superposed with the low-frequency signals after frequency division, bass enhancement processing in the audio signals is realized, and analog signals are directly processed in the audio processing process, so that the influence of the sampling and digital-to-analog conversion process on the quality of the audio signals is reduced, the user experience is improved, and the circuit is simple in structure, easy to implement and low in cost.
As can be seen from the above analysis, the high frequency signal obtained by frequency dividing the audio signal may be attenuated and then superimposed with the low frequency signal without attenuation, so as to obtain the bass-enhanced audio signal. In practical application, because there is a difference in hearing between users, and an audio signal formed by superimposing an attenuated high-frequency signal and a non-attenuated low-frequency signal may not satisfy hearing feelings of some users, in a possible implementation form of the present application, the obtained low-frequency signal may be further attenuated to a certain degree according to a selection of a user, and then superimposed with the attenuated high-frequency signal, so that a bass enhancement degree of the obtained audio signal satisfies a requirement of the user. That is, the audio processing circuit provided in the present application, as shown in fig. 2, may further include: a second attenuation network 14, wherein the attenuation factor of the second attenuation network 14 is smaller than the attenuation factor of the first attenuation network 12.
Specifically, an input end of the second attenuation network 14 is connected to an output end of the low-pass filter 11; the output of the second attenuation network 14 is connected to the output of the high pass filter 13 for outputting an audio signal.
In specific implementation, the audio signal can be divided into two paths, one path of the audio signal is attenuated by the first attenuation network 12, and the low-frequency signal is filtered by the high-pass filter 13 to obtain an attenuated high-frequency signal; the other path of the low-frequency signal is filtered by a low-pass filter 11, attenuated by a second attenuation network 14 to obtain an attenuated low-frequency signal, and the attenuated high-frequency signal and the attenuated low-frequency signal are superposed. In the embodiment of the present application, although both the high frequency signal and the low frequency signal are attenuated, since the attenuation factor of the second attenuation network 14 is smaller than that of the first attenuation network 12, the attenuation degree of the low frequency signal is lower than that of the high frequency signal. Therefore, the low frequency signal of the superimposed audio signal has a higher percentage than the original audio signal, so that the bass sound is enhanced.
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 filtered to remove the low-frequency signal through the high-pass filter 13, then the obtained high-frequency signal is attenuated through the first attenuation network 12, the other path of audio signal is attenuated through the second attenuation network 14, then the low-pass filter 11 is used to remove the high-frequency signal, and finally the high-frequency signal is superimposed to the bass-enhanced audio signal. The specific circuit connection relationship is not described herein.
Further, the audio processing circuit provided in the present application may further enable a user to select whether to attenuate the low frequency signal according to a requirement, that is, in the audio processing circuit provided in the present application, as shown in fig. 2, a gating network 15 may be further included.
Wherein, the first input terminal of the gating network 15 is connected to the input terminal of the second attenuation network 14 and the output terminal of the low pass filter 11;
a second input of the gating network 15, connected to an output of the second attenuator network 14;
the output end of the gating network 15 is connected to the output end of the high-pass filter 13, and the gating network is configured to control the connection between the first input end or the second input end and the output end of the gating network 15 according to a 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 movable contact of the single-pole double-throw switch is in contact 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 end of the second attenuation network 14 and an output end of the low-pass filter 11 are connected with an output end of the high-pass filter 13 through the gating network 15, so that a low-frequency signal obtained after filtering by the low-pass filter 11 is not attenuated, and is directly superimposed with a high-frequency signal output by the high-pass filter 13 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, at the moment, the output end of the second attenuation network 14 is connected with the output end of the high-pass filter 13 through the gating network 15, a low-frequency signal obtained after filtering is carried out through the low-pass filter 11, then the low-frequency signal is attenuated through the second attenuation network 14 and then superposed with a high-frequency signal output by the high-pass filter 13, and a bass-enhanced audio signal is obtained. Therefore, the gating network 15 can control the connection between the first input end or the second input end and the output end of the gating network 15 according to the control signal input by the control end, so as to control whether the low-frequency signal is attenuated.
During concrete implementation, a button can be arranged on the terminal device to control whether to attenuate the low-frequency signal obtained by frequency division, and a user can press the button or press different buttons through 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 whether to attenuate the low-frequency signal.
The foregoing embodiments have described the structure of the audio processing circuit proposed in the present application, and each part constituting the audio processing circuit in the embodiments of the present application is specifically described below with reference to the accompanying drawings.
Fig. 3 is a schematic structural diagram of an audio 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 first attenuator network 12, and the other end of the first resistor R1 is connected to one end of the first capacitor C1 and the output end of the high-pass filter 13;
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 audio 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.
Wherein one end of the second capacitor C2 is connected to one end of the first capacitor C1, 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 high pass filter 13;
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.
As shown in fig. 5, the second attenuator network 14 may specifically include a third resistor R3 and a fourth resistor R4.
One end of the third resistor R3 is connected with the other end of the first resistor R1;
the other end of the third resistor R3 is connected to one end of the fourth resistor and the second input end of the gating network 15;
the other end of the fourth resistor is connected to one end of the second resistor R2.
It can be understood that, since the third resistor R3 and the fourth resistor R4 are connected to ground through the second resistor R2, the voltage at the second input end of the gating network 15 is a voltage division value of the voltage of the low-frequency signal output by the low-pass filter 11 on the fourth resistor R4 and the second resistor R2, and therefore, the attenuation of the low-frequency signal output by the low-pass filter 11 can be realized through the voltage division of the resistors.
In this case, the voltage at the second input end of the gate network 15 is a divided value of the voltage of the low-frequency signal output by the low-pass filter 11 at the fourth resistor R4.
In addition, as shown in fig. 5, the first attenuation network 12 may specifically include a fifth resistor R5 and a sixth resistor R6, and the high pass filter 13 may include a fourth capacitor C4.
One end of the fifth resistor R5 is connected to the input end of the low-pass filter 11, and is used for receiving an audio signal;
the other end of the fifth resistor R5 is connected to one end of the sixth resistor R6 and one end of the fourth capacitor C4;
the other end of the sixth resistor R6 is connected with the ground;
the other end of the fourth capacitor C4 is connected to the output end of the low-pass filter 11, and is used for outputting an audio signal.
Specifically, since the fifth resistor R5 is connected to ground through the sixth resistor R6, the voltage value output by the first attenuation network 12 is the voltage division value of the voltage of the input audio signal over the sixth resistor R6, and the attenuation of the audio signal can be realized through the voltage division by the resistors. Since the capacitor has the characteristic of passing ac and blocking dc, the fourth capacitor C4 can obtain an attenuated high-frequency signal, which is then superimposed on the low-frequency signal output by the low-pass filter 11 to obtain a bass-enhanced audio signal.
In addition, in order to achieve maximum transmission of power, in the audio processing circuit provided in the embodiment of the present application, as shown in fig. 6, a seventh resistor R7 may be further included to achieve impedance matching. Fig. 6 is a diagram illustrating the gating network 15 as a gating chip. The 8 th pin NO of the gating chip is a first input end of the gating chip, the 2 nd pin NC of the gating chip is a second input end of the gating chip, the pin GND is grounded, and the pin IN is a control end of the gating chip.
Specifically, one end of the seventh resistor R7 is connected to an input end of a control signal, and the other end of the seventh resistor R7 is connected to a control end of the gating network 15.
It should be noted that, a resistor may be disposed at a suitable position in the audio processing circuit provided in the embodiment of the present application as needed to implement impedance matching of the circuit, such as the resistor R8 in fig. 6.
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 fourth resistor R4 shown in fig. 6 may be formed by two resistors connected in parallel, and the fifth resistor R5 and the sixth resistor R6 are respectively formed by two resistors connected in series. Accordingly, in the embodiment of the present application, any capacitor may be a series connection or a parallel connection of a plurality of capacitors, for example, the third capacitor C3 shown in fig. 6 is formed by two capacitors connected in parallel.
The audio processing circuit provided by the embodiment of the application comprises: a low pass filter, a first attenuation network and a high pass filter; the input end of the low-pass filter is connected with the input end of the first attenuation network and used for receiving an audio signal; the output end of the first attenuation network is connected with the input end of the high-pass filter; and the output end of the high-pass filter is connected with the output end of the low-pass filter and used for outputting audio signals. Therefore, frequency division is carried out by utilizing the low-pass filter and the high-pass filter, the high-frequency signal after frequency division is subjected to signal attenuation by utilizing the first attenuation network and then is superposed with the low-frequency signal after frequency division, the bass enhancement processing in the audio signal is realized, the analog signal is directly processed in the audio processing process, the influence of the sampling and digital-analog conversion process on the quality of the audio signal is reduced, the user experience is improved, the circuit structure is simple, the realization is easy, the cost is low, the low-frequency signal after frequency division is attenuated by utilizing the second attenuation network and then is superposed with the attenuated high-frequency signal, the bass enhancement of the audio signal in different degrees is realized, the user requirements 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 circuit 75, audio processing circuit 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 audio 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 audio processing circuit 76 comprises: a low pass filter, a first attenuation network and a high pass filter;
the input end of the low-pass filter is connected with the input end of the first attenuation network and used for receiving an audio signal;
the output end of the first attenuation network is connected with the input end of the high-pass filter;
and the output end of the high-pass filter is connected with the output end of the low-pass filter and used for outputting audio signals.
It should be noted that the foregoing explanation of the embodiment of the audio processing circuit is also applicable to the terminal device of the embodiment, and the implementation principle is similar, and is not described herein again.
In the terminal device provided in the embodiment of the present application, the audio processing circuit includes: a low pass filter, a first attenuation network and a high pass filter; the input end of the low-pass filter is connected with the input end of the first attenuation network and used for receiving the audio signal; the output end of the first attenuation network is connected with the input end of the high-pass filter; the output end of the high-pass filter is connected with the output end of the low-pass filter and used for outputting the audio signal. Therefore, the low-pass filter and the high-pass filter are used for frequency division, the high-frequency signals after frequency division are subjected to signal attenuation by the first attenuation network and then are superposed with the low-frequency signals after frequency division, bass enhancement processing in the audio signals is realized, and analog signals are directly processed in the audio processing process, so that the influence of the sampling and digital-to-analog conversion process on the quality of the audio signals is reduced, the user experience is improved, and the circuit is simple in structure, easy to implement and low in cost.
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. An audio processing circuit, comprising: a low pass filter, a first attenuation network and a high pass filter;
the input end of the low-pass filter is connected with the input end of the first attenuation network and used for receiving an audio signal;
the output end of the first attenuation network is connected with the input end of the high-pass filter;
the output end of the high-pass filter is connected with the output end of the low-pass filter and used for outputting audio signals, and the first attenuation network is a pi-shaped attenuation network, a T-shaped attenuation network or any other type of attenuation network formed by a plurality of resistors;
further comprising: a second attenuation network having an attenuation factor less than an attenuation factor of the first attenuation network;
the input end of the second attenuation network is connected with the output end of the low-pass filter; the output end of the second attenuation network is connected with the output end of the high-pass filter and used for outputting audio signals.
2. The circuit of claim 1, further comprising: a gating network;
the first input end of the gating network is connected with the input end of the second attenuation network and the output end of the low-pass filter;
the second input end of the gating network is connected with the output end of the second attenuation network;
the output end of the gating network is connected with the output end of the high-pass filter, and the gating network is used for controlling the connection between the first input end or the second input end and the output end of the gating network according to a control signal.
3. The circuit of claim 2, 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 first attenuation network, and the other end of the first resistor is connected with one end of the first capacitor and the output end of the high-pass filter;
the other end of the first capacitor is connected with the ground.
4. The circuit of claim 3, 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 second capacitor is connected with one end of the third capacitor and the output end of the high-pass filter;
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.
5. The circuit of claim 4, wherein the second attenuation network comprises: a third resistor and a fourth resistor;
one end of the third resistor is connected with the other end of the first resistor;
the other end of the third resistor is connected with one end of the fourth resistor and the second input end of the gating network;
the other end of the fourth resistor is connected with one end of the second resistor.
6. The circuit of claim 4 or 5, wherein the first attenuation network comprises: a fifth resistor and a sixth resistor; the high pass filter comprises a fourth capacitor;
one end of the fifth resistor is connected with the input end of the low-pass filter and used for receiving an audio signal;
the other end of the fifth resistor is connected with one end of the sixth resistor and one end of the fourth capacitor;
the other end of the sixth resistor is connected with the ground;
the other end of the fourth capacitor is connected with the output end of the low-pass filter and used for outputting audio signals.
7. The circuit of claim 4 or 5, further comprising: a seventh resistor;
one end of the seventh resistor is connected with the input end of the control signal, and the other end of the seventh resistor is connected with the control end of the gating network.
8. The circuit of claim 2, wherein the gating network comprises any one of: single pole double throw switch, gate.
9. A terminal device, comprising one or more of the following components: the audio device comprises a circuit board, a shell, a processor, a memory, a power circuit, an audio 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 audio 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 audio processing circuit comprises: a low pass filter, a first attenuation network and a high pass filter;
the input end of the low-pass filter is connected with the input end of the first attenuation network and used for receiving an audio signal;
the output end of the first attenuation network is connected with the input end of the high-pass filter;
the output end of the high-pass filter is connected with the output end of the low-pass filter and used for outputting audio signals, and the first attenuation network is a pi-shaped attenuation network, a T-shaped attenuation network or any other type of attenuation network formed by a plurality of resistors;
further comprising: a second attenuation network having an attenuation factor less than an attenuation factor of the first attenuation network;
the input end of the second attenuation network is connected with the output end of the low-pass filter; the output end of the second attenuation network is connected with the output end of the high-pass filter and used for outputting audio signals.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113170260B (en) * | 2018-11-14 | 2022-05-31 | 深圳市欢太科技有限公司 | Audio processing method and device, storage medium and electronic equipment |
| KR102475665B1 (en) * | 2020-11-12 | 2022-12-07 | 엑스멤스 랩스 인코포레이티드 | Crossover Circuit |
| 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 |
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