Mega bass signal extraction circuit and device

Abstract

The utility model relates to the technical field of audio signal extraction, in particular to a mega bass signal extraction circuit and device, and the circuit comprises a signal processing module which has an input end connected with an audio signal source and is used for carrying out the signal processing of a first audio signal, so as to obtain a second audio signal; the input end of the signal amplification module is connected with the output end of the signal processing module, and the signal amplification module is used for amplifying the second audio signal to obtain a third audio signal; the input end of the low-pass filtering module is connected with the output end of the signal amplification module, the output end of the low-pass filtering module is connected with a mega bass output port, and the low-pass filtering module is used for outputting the third audio signal subjected to low-pass filtering to the mega bass output port. The beneficial effect of reducing the implementation cost of mega bass audio signal extraction can be realized.

Description

Technical Field

[0001] The present application relates to the technical field of audio signal extraction, and in particular to a circuit and device for extracting a heavy bass signal. Background Art

[0002] With the continuous development of in-car entertainment systems, users' requirements for audio quality are also increasing. Although the existing ASP audio processing chip CD3313 can provide 4-channel stereo output, it cannot meet users' high standards for bass effect. Although there are chips with bass output function on the market, these solutions are often expensive, which undoubtedly increases the cost pressure of products for cost-sensitive in-car system manufacturers.

[0003] Based on this, how to provide a solution to reduce the cost of heavy bass signal output design is a technical problem that needs to be solved urgently. Utility Model Content

[0004] The purpose of the present application is to provide a heavy bass signal extraction circuit and device, which can achieve the beneficial effect of reducing the cost of extracting heavy bass audio signals.

[0005] The first aspect of the present application provides a heavy bass signal extraction circuit: comprising:

[0006] A signal processing module, wherein an input end of the signal processing module is connected to an audio signal source and is used to perform signal processing on a first audio signal output by the audio signal source to obtain a second audio signal;

[0007] a signal amplifying module, wherein an input end of the signal amplifying module is connected to an output end of the signal processing module, and is used to amplify the second audio signal to obtain a third audio signal;

[0008] A low-pass filtering module, wherein the input end of the low-pass filtering module is connected to the output end of the signal amplifying module, and the output end of the low-pass filtering module is connected to the subwoofer output port, for outputting the third audio signal after low-pass filtering to the subwoofer output port.

[0009] By adopting the above technical solution, the signal processing module processes the first audio signal input from the audio signal source. In this embodiment, the input audio signal is between 20HZ and 20KHZ. The signal processing module blocks direct current and performs impedance matching on the audio signal, allowing only the alternating current audio signal (the second audio signal) to pass through, so as to prevent the direct current bias from affecting the subsequent amplifier circuit; the second audio signal is amplified by the relevant amplifier, converting the current change into a voltage change, thereby realizing signal amplification, and the amplified third audio signal is obtained; the third audio signal is subjected to low-pass filtering processing by the low-pass filtering module to obtain the required bass audio signal (for example, the bass audio signal within 400HZ). In this solution, fewer devices are used and the composition is simple. While realizing the extraction of the bass audio signal, the cost is significantly reduced compared with the relevant chips, thus achieving the beneficial effect of reducing the implementation cost of the bass audio signal extraction.

[0010] Optionally, the signal processing module includes a first resistor, one end of the first resistor is connected to the audio signal source, and the other end is connected to the input end of the signal amplification module.

[0011] By adopting the above technical solution, impedance matching is performed between the first resistor and the first audio signal output from the audio signal source, so as to ensure that the signal can be effectively transmitted to the next-stage circuit.

[0012] Optionally, the signal processing module further includes a first capacitor, and the first capacitor is connected in series at the connection between the first resistor and the signal amplification module.

[0013] By adopting the above technical solution, the characteristic of the first capacitor of passing alternating current and blocking direct current is used to block the direct current component and only allow the alternating current audio signal to pass through, so as to prevent the direct current bias from affecting the subsequent amplifier circuit.

[0014] Optionally, the signal amplification module includes a second resistor, a third resistor, a fourth resistor and a triode;

[0015] One end of the second resistor is connected to one end of the first capacitor and one end of the fourth resistor, the other end of the second resistor is connected to the collector of the triode and one end of the third resistor, the other end of the third resistor is connected to an external direct current signal source, and the other end of the fourth resistor is grounded;

[0016] The collector of the triode is also connected to the input end of the low-pass filtering module, the base of the triode is connected to the connection between the second resistor, the fourth resistor and the first capacitor, and the emitter of the triode is grounded.

[0017] By adopting the above technical solution, an AC amplification circuit is composed of a second resistor, a third resistor, a fourth resistor, and a triode. Among them, the second resistor and the fourth resistor provide bias for the base of the triode, and the third resistor is the collector resistor of the triode, which is used to convert the current change into a voltage change, so as to realize the amplification of the signal. The triode, as the core of the amplifier, amplifies the input audio signal.

[0018] Optionally, the low-pass filter module includes a second capacitor and a fifth resistor;

[0019] One end of the second capacitor is connected to the collector of the triode, the other end of the second capacitor is connected to one end of the fifth resistor, and the other end of the fifth resistor is connected to the subwoofer output port.

[0020] Optionally, the low-pass filter module further includes a third capacitor and a sixth resistor;

[0021] One end of the third capacitor is connected to the emitter of the triode, the other end of the third capacitor is connected to one end of the sixth resistor, and the other end of the sixth resistor is connected to the subwoofer output port.

[0022] By adopting the above technical solution, components such as the second capacitor, the fifth resistor, the third capacitor, and the sixth resistor constitute a low-pass filter network, and the series combination of the capacitor and the resistor forms an RC low-pass filter. This filter can cut high-frequency signals and only allow signals below a certain cut-off frequency to pass through. In this circuit, the cut-off frequency can be set at about 400 Hz to ensure that the output is mainly subwoofer audio signals.

[0023] The second aspect of this application provides a subwoofer extraction device equipped with the above-mentioned subwoofer signal extraction circuit.

[0024] To sum up, the beneficial effects of this application are as follows: The signal processing module processes the first audio signal input from the audio signal source. In this embodiment, the input audio signal is between 20HZ and 20KHZ. The signal processing module blocks the direct current and performs impedance matching on the audio signal, and only allows the alternating current audio signal to pass through (the second audio signal) to prevent the direct current bias from affecting the subsequent amplifier circuit; the second audio signal is amplified by the relevant amplifier, converting the current change into a voltage change, so as to realize the amplification of the signal, and the third audio signal is obtained after amplification; the third audio signal is subjected to low-pass filtering processing by the low-pass filter module to obtain the required subwoofer audio signal (such as a subwoofer audio signal within 400HZ). In this solution, fewer devices are used and the composition is simple. While realizing the extraction of the subwoofer audio signal, the cost is significantly reduced compared with the relevant chips, thus achieving the beneficial effect of reducing the implementation cost of the subwoofer audio signal extraction. Description of the Drawings

[0025] Figure 1 is a module connection diagram of the subwoofer signal extraction circuit provided by an embodiment of the present application;

[0026] Figure 2 is a circuit schematic diagram of the subwoofer signal extraction circuit provided by an embodiment of the present application. Detailed Embodiments

[0027] The following embodiments will help those skilled in the art further understand the function of the present application, but do not limit the present application in any form. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made. These all belong to the protection scope of the present application.

[0028] In the following description, specific details such as specific system structures and technologies are presented for the purpose of illustration rather than limitation, so as to thoroughly understand the embodiments of the present application. However, those skilled in the art should clearly understand that the present application can also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to avoid unnecessary details from interfering with the description of the present application.

[0029] It should be understood that when used in the specification and appended claims of the present application, the term "comprising" indicates the presence of the described features, wholes, steps, operations, elements, and / or components, but does not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components, and / or their combinations.

[0030] It should also be understood that the term "and / or" as used in the specification and appended claims of the present application refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0031] In addition, in the description of the specification and appended claims of the present application, the terms "first", "second", "third", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0032] Reference to "one embodiment" or "some embodiments" described in the specification of this application means that a specific feature, structure, or characteristic described in connection with that embodiment is included in one or more embodiments of this application. Thus, statements such as "in one embodiment", "in some embodiments", "in other some embodiments", "in still other embodiments", etc. that appear in different places in this specification do not necessarily all refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways. The terms "comprising", "including", "having" and their variants all mean "including but not limited to", unless otherwise specifically emphasized in other ways.

[0033] The following further elaborates on this application in conjunction with the accompanying drawings.

[0034] Referring to Figure 1 , which is a module connection diagram of the bass signal extraction circuit provided by the embodiment of this application, including:

[0035] A signal processing module, the input end of which is connected to the audio signal source AUDIO_IN, and is used to perform signal processing on the first audio signal output by the audio signal source AUDIO_IN to obtain a second audio signal;

[0036] A signal amplification module, the input end of which is connected to the output end of the signal processing module, and is used to amplify the second audio signal to obtain a third audio signal;

[0037] A low-pass filtering module, the input end of which is connected to the output end of the signal amplification module, and the output end of which is connected to the bass output port SUB, and is used to output the third audio signal after low-pass filtering to the bass output port SUB.

[0038] Specifically, the signal processing module processes the first audio signal input by the audio signal source AUDIO_IN. In this embodiment, the input audio signal is between 20HZ and 20KHZ. The signal processing module blocks direct current and performs impedance matching on the audio signal, allowing only the alternating current audio signal (the second audio signal) to pass through, so as to prevent the direct current bias from affecting the subsequent amplifier circuit; the second audio signal is amplified by a relevant amplifier (for example, amplified by the triode Q1), so as to achieve signal amplification, and the third audio signal is obtained after amplification; the third audio signal is subjected to low-pass filtering processing by the low-pass filtering module, so as to obtain the required bass audio signal (for example, the bass audio signal within 400HZ). In this solution, fewer components are used and the composition is simple. While realizing the extraction of the bass audio signal, the cost is significantly reduced compared with relevant chips, thus achieving the beneficial effect of reducing the implementation cost of extracting the bass audio signal.

[0039] Further, please refer to Figure 2 , Figure 2 which is the bass signal extraction circuit provided by the embodiments of the present application. The following will specifically describe each of the above modules in combination with the specific circuit designs in the Figure 2 provided modules:

[0040] Optionally, the signal processing module includes a first resistor R1. One end of the first resistor R1 is connected to the audio signal source AUDIO_IN, and the other end is connected to the input end of the signal amplification module.

[0041] Specifically, the first resistor R1 is used for impedance matching with the first audio signal output by the audio signal source AUDIO_IN, so as to ensure that the signal can be effectively transmitted to the next-stage circuit.

[0042] Optionally, the signal processing module further includes a first capacitor C1. The first capacitor C1 is connected in series at the connection between the first resistor R1 and the signal amplification module.

[0043] Specifically, the characteristic of the first capacitor C1 of passing alternating current and blocking direct current is used to block the direct current component and only allow the alternating current audio signal to pass through, so as to prevent the direct current bias from affecting the subsequent amplifier circuit.

[0044] Optionally, the signal amplification module includes a second resistor R2, a third resistor R3, a fourth resistor R4, and a triode Q1;

[0045] One end of the second resistor R2 is connected to one end of the first capacitor C1 and one end of the fourth resistor R4. The other end of the second resistor R2 is connected to the collector of the triode Q1 and one end of the third resistor R3. The other end of the third resistor R3 is connected to an external DC signal source, and the other end of the fourth resistor R4 is grounded;

[0046] The collector of the triode Q1 is also connected to the input end of the low-pass filter module. The base of the triode Q1 is connected to the connection between the second resistor R2, the fourth resistor R4, and the first capacitor C1, and the emitter of the triode Q1 is grounded.

[0047] Specifically, the second resistor R2, the third resistor R3, the fourth resistor R4, and the triode Q1 are used to form an AC amplification circuit. Among them, the second resistor R2 and the fourth resistor R4 provide bias for the base of the triode Q1, and the third resistor R3 is the collector resistor of the triode Q1, which is used to convert the current change into a voltage change, so as to realize the signal amplification. The triode Q1, as the core of the amplifier, amplifies the input audio signal.

[0048] Optionally, the low-pass filtering module includes a second capacitor C2 and a fifth resistor R5;

[0049] One end of the second capacitor C2 is connected to the collector of the triode Q1, the other end of the second capacitor C2 is connected to one end of the fifth resistor R5, and the other end of the fifth resistor R5 is connected to the subwoofer output port SUB.

[0050] Optionally, the low-pass filtering module further includes a third capacitor C3 and a sixth resistor R6;

[0051] One end of the third capacitor C3 is connected to the emitter of the triode Q1, the other end of the third capacitor C3 is connected to one end of the sixth resistor R6, and the other end of the sixth resistor R6 is connected to the subwoofer output port SUB.

[0052] Specifically, components such as the second capacitor C2, the fifth resistor R5, the third capacitor C3, and the sixth resistor R6 constitute a low-pass filtering network, and the series combination of the capacitor and the resistor forms an RC low-pass filter. This filter can cut high-frequency signals and only allow signals below a certain cut-off frequency to pass through. In this circuit, the cut-off frequency can be set at about 400 Hz to ensure that the output is mainly the subwoofer audio signal.

[0053] The second aspect of this application provides a subwoofer extraction device loaded with the above-mentioned subwoofer signal extraction circuit.

[0054] The above embodiments are only used to illustrate the technical solutions of this application, rather than to limit them; although this application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included in the protection scope of this application.

Claims

1. A heavy bass signal extraction circuit, characterized in that Comprising: A signal processing module, the input end of which is connected to an audio signal source, and is used for performing signal processing on a first audio signal output by the audio signal source to obtain a second audio signal; A signal amplification module, the input end of which is connected to the output end of the signal processing module, and is used for amplifying the second audio signal to obtain a third audio signal; A low-pass filtering module, the input end of which is connected to the output end of the signal amplification module, and the output end of which is connected to a subwoofer output port, and is used for outputting the third audio signal after low-pass filtering to the subwoofer output port.

2. The bass signal extraction circuit according to claim 1, wherein: The signal processing module includes a first resistor, one end of which is connected to the audio signal source, and the other end of which is connected to the input end of the signal amplification module.

3. The heavy bass signal extraction circuit according to claim 2, characterized in that: The signal processing module further includes a first capacitor, which is connected in series at the connection between the first resistor and the signal amplification module.

4. The heavy bass signal extraction circuit according to claim 3, wherein: The signal amplification module includes a second resistor, a third resistor, a fourth resistor and a triode; One end of the second resistor is connected to one end of the first capacitor and one end of the fourth resistor, the other end of the second resistor is connected to the collector of the triode and one end of the third resistor, the other end of the third resistor is connected to an external DC signal source, and the other end of the fourth resistor is grounded; The collector of the triode is further connected to the input end of the low-pass filtering module, the base of the triode is connected to the connection point of the second resistor, the fourth resistor and the first capacitor, and the emitter of the triode is grounded.

5. The bass signal extraction circuit according to claim 4, wherein: The low-pass filtering module includes a second capacitor and a fifth resistor; One end of the second capacitor is connected to the collector of the triode, the other end of the second capacitor is connected to one end of the fifth resistor, and the other end of the fifth resistor is connected to the subwoofer output port.

6. The bass signal extraction circuit according to claim 5, characterized in that: The low-pass filtering module further includes a third capacitor and a sixth resistor; One end of the third capacitor is connected to the emitter of the triode, the other end of the third capacitor is connected to one end of the sixth resistor, and the other end of the sixth resistor is connected to the subwoofer output port.

7. A heavy bass signal extraction device, characterized in that, Loaded with a subwoofer signal extraction circuit as described in any one of claims 1-6.

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