Guitar signal processing circuit and electric guitar sound box

Abstract

The utility model discloses a guitar signal processing circuit and an electric guitar sound box, and relates to the technical field of electric guitar sound boxes, and the processing circuit comprises a first pre-amplification module which is used for inputting a guitar signal outputted by a sound pickup, carrying out the first amplification of the guitar signal, and outputting the guitar signal after the first amplification; the second pre-amplification module is used for inputting the guitar signal amplified for the first time, amplifying the guitar signal for the second time and outputting the guitar signal amplified for the second time; the equalization module is used for adjusting components of at least two preset frequency bands in the second amplified guitar signal and outputting the adjusted guitar signal; and the power amplification module is used for inputting the adjusted guitar signal, performing third amplification on the guitar signal, and outputting the guitar signal after power amplification. According to the invention, tone adjustment can be realized, the functions of the electric guitar sound box are richer, and the application scene is richer.

Description

Technical Field

[0001] The utility model relates to the technical field of electric guitar amplifiers, and particularly relates to a processing circuit for guitar signals and an electric guitar amplifier. Background Art

[0002] In the field of electric guitars, an electric guitar obtains guitar signals generated by a musician's playing through a pickup, and is connected to an electric guitar amplifier through a data cable. After receiving and processing the guitar signals (such as amplification, filtering, etc.), the electric guitar amplifier emits sound through a speaker (or called a horn).

[0003] For example, the fender 5f2a electric guitar amplifier produced by Fender Company has only functions of gain adjustment and volume adjustment, with relatively single functions and limited application scenarios. Content of the Utility Model

[0004] The main technical problem to be solved by the utility model is the problem that the functions of existing electric guitar amplifiers are not rich enough.

[0005] According to a first aspect, in one embodiment, a processing circuit for guitar signals is provided, including:

[0006] A first pre-amplification module, configured to input the guitar signals output by the pickup, perform a first amplification on the guitar signals, and output the guitar signals after the first amplification;

[0007] A second pre-amplification module, configured to input the guitar signals after the first amplification, perform a second amplification on the guitar signals, and output the guitar signals after the second amplification;

[0008] An equalization module, configured to adjust the components of at least two preset frequency bands in the guitar signals after the second amplification, and output the adjusted guitar signals;

[0009] A power amplification module, configured to input the adjusted guitar signals, perform a third amplification on the guitar signals, and output the guitar signals after the power amplification.

[0010] In one embodiment, the equalization module includes three first filtering modules connected in parallel;

[0011] The first filtering module is configured to filter the input guitar signals in a preset frequency band, and the three first filtering modules respectively filter the high frequency, medium frequency and low frequency.

[0012] In one embodiment, the first filtering module includes a filtering capacitor and an adjusting potentiometer connected in series. The filtering capacitor is configured to filter the guitar signals in a preset frequency band, and the adjusting potentiometer is configured to adjust the filtering ratio. The filtering capacitors of each first filtering module are different.

[0013] In one embodiment, the first pre - amplification module includes a first amplifier and a tone - switching module. The tone - switching module is connected to the power supply terminal of the first amplifier.

[0014] The guitar signal is input to the control terminal of the first amplifier.

[0015] The tone - switching module has a switching switch and a resistor - capacitor circuit. The switching switch is used to switch the connection relationship between the resistor and the capacitor in the resistor - capacitor circuit, providing two different loads connected to the power supply terminal of the first amplifier, and adjusting the components of the high - frequency signal and the low - frequency signal in the guitar signal after the first amplification.

[0016] In one embodiment, the first amplifier includes a vacuum tube or a transistor.

[0017] In one embodiment, the second pre - amplification module includes a second amplifier and a gain - adjustment module. The gain - adjustment module is connected between the output terminal of the first pre - amplification module and the control terminal of the second amplifier. The guitar signal after the first amplification is input to the control terminal of the second amplifier through the gain - adjustment module.

[0018] The gain - adjustment module is used to adjust the impedance connected to the control terminal of the second amplifier.

[0019] In one embodiment, the gain - adjustment module includes a potentiometer; and / or, the second amplifier includes a vacuum tube or a transistor.

[0020] In one embodiment, the power - amplification module includes a power amplifier and a volume - adjustment module.

[0021] The volume - adjustment module is connected between the output terminal of the equalization module and the control terminal of the power amplifier. The guitar signal adjusted by the equalization module is input to the control terminal of the power amplifier through the volume - adjustment module.

[0022] The volume - adjustment module is used to adjust the impedance connected to the control terminal of the power amplifier.

[0023] According to the second aspect, in one embodiment, an electric - guitar amplifier is provided, including:

[0024] The processing circuit described in the first aspect, which is used to input a guitar signal, process it, and output a power - amplified guitar signal.

[0025] A first transformer, which is used to step - down the power - amplified guitar signal and output the stepped - down guitar signal to the speaker.

[0026] A speaker, which is used to emit sound when driven by the stepped - down guitar signal.

[0027] In one embodiment, the electric guitar amplifier further includes a power supply module for supplying power to the processing circuit. The power supply module includes a switching switch circuit, a second transformer, a rectification module, and a second filtering module.

[0028] The second transformer is used to connect to an external power supply and transform the AC input voltage.

[0029] The rectification module is used to convert the transformed input voltage into a DC voltage.

[0030] The second filtering module is used to filter the DC input voltage.

[0031] The switching switch circuit is used to switch the number of turns connected to the external power supply in the primary coil of the transformer.

[0032] According to the processing circuit of the guitar signal and the electric guitar amplifier of the above embodiment, by adding an equalization module, the components of at least two frequency bands among the high, middle, and low frequencies of the guitar signal can be adjusted, so that the frequency of the sound finally output by the amplifier can be changed, realizing the adjustment of the timbre, making the functions of the electric guitar amplifier more abundant and the applicable scenarios more diverse. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic structural diagram of an electric guitar amplifier provided by an embodiment of the present application;

[0034] Figure 2 It is a schematic structural diagram of a processing circuit provided by an embodiment of the present application;

[0035] Figure 3 It is a schematic structural diagram of a first pre - amplifier module provided by an embodiment of the present application;

[0036] Figure 4 It is a schematic circuit diagram of a first pre - amplifier module provided by an embodiment of the present application;

[0037] Figure 5 It is a schematic structural diagram of a second pre - amplifier module provided by an embodiment of the present application;

[0038] Figure 6 It is a schematic circuit diagram of a second pre - amplifier module provided by an embodiment of the present application;

[0039] Figure 7 It is a schematic structural diagram of an equalization module provided by an embodiment of the present application;

[0040] Figure 8 It is a schematic circuit diagram of an equalization module provided by an embodiment of the present application;

[0041] Figure 9Schematic diagram of the power amplification module provided by an embodiment of the present application;

[0042] Figure 10 Circuit schematic diagram of the power amplification module provided by an embodiment of the present application;

[0043] Figure 11 Schematic diagram of the power supply module provided by an embodiment of the present application;

[0044] Figure 12 Circuit schematic diagram of the switching switch circuit and the second transformer provided by an embodiment of the present application;

[0045] Figure 13 Circuit schematic diagram of the rectification module provided by an embodiment of the present application;

[0046] Figure 14 Circuit schematic diagram of the second filtering module provided by an embodiment of the present application.

[0047] Reference numerals: 10 - pickup; 20 - processing circuit; 21 - first pre - amplification module; 210 - first amplifier; 211 - tone switching module; 212 - switching switch; 213 - resistor - capacitor circuit; 22 - second pre - amplification module; 220 - second amplifier; 221 - gain adjustment module; 23 - equalization module; 230 - first filtering module; 231 - filtering capacitor; 232 - adjusting potentiometer; 24 - power amplification module; 240 - power amplifier; 241 - volume adjustment module; 30 - first transformer; 40 - speaker; 50 - power supply module; 51 - switching switch circuit; 52 - second transformer; 53 - rectification module; 54 - second filtering module; 60 - external power supply. Detailed implementation manners

[0048] The present utility model will be further described in detail below in conjunction with the accompanying drawings through specific implementation manners. Similar elements in different implementation manners adopt related similar element numbers. In the following implementation manners, many detailed descriptions are provided to enable a better understanding of the present application. However, those skilled in the art can easily recognize that some of the features can be omitted in different situations, or can be replaced by other elements, materials, or methods. In some cases, some operations related to the present application are not shown or described in the specification, which is to avoid the core part of the present application being overwhelmed by excessive descriptions. For those skilled in the art, it is not necessary to describe these related operations in detail, and they can fully understand the related operations based on the description in the specification and the general technical knowledge in the art.

[0049] In addition, the features, operations, or characteristics described in the specification can be combined in any suitable manner to form various embodiments. At the same time, the steps or actions in the method description can also be reordered or adjusted in a manner that is obvious to those skilled in the art. Therefore, the various sequences in the specification and drawings are only for clearly describing a certain embodiment and do not mean that they are necessary sequences, unless it is otherwise stated that a certain sequence must be followed.

[0050] The serial numbers assigned to the components herein, such as "first", "second", etc., are only used to distinguish the objects described and do not have any sequential or technical meaning. And as used in this application, "connection" and "coupling", unless otherwise specified, both include direct and indirect connection (coupling).

[0051] As Figure 1 shown, an embodiment of the present application provides a processing circuit 20 for guitar signals and an electric guitar amplifier. The electric guitar amplifier may include: a processing circuit 20, a first transformer 30, and a speaker 40.

[0052] The electric guitar is provided with a pickup 10 for outputting guitar signals under the operation of the user. The electric guitar is electrically connected to the electric guitar amplifier through a cable, and the guitar signals are input to the processing circuit 20.

[0053] The processing circuit 20 is used to input guitar signals, process them, and output the guitar signals after power amplification.

[0054] The first transformer 30 is used to transform the guitar signals after power amplification and output the transformed guitar signals to the speaker 40.

[0055] The speaker 40 is used to emit sound under the drive of the transformed guitar signals.

[0056] The following will be a detailed description of the processing circuit 20. As Figure 2 shown, an embodiment of the present application provides a processing circuit 20 for guitar signals, which may include: a first preamplification module 21, a second preamplification module 22, an equalization module 23, and a power amplification module 24.

[0057] The first preamplification module 21 is used to input the guitar signals output by the pickup 10, perform a first amplification on the guitar signals, and output the guitar signals after the first amplification.

[0058] The second preamplification module 22 is used to input the guitar signals after the first amplification, perform a second amplification on the guitar signals, and output the guitar signals after the second amplification.

[0059] The equalization module 23 is used to adjust the components of at least two preset frequency bands in the second amplified guitar signal and output the adjusted guitar signal. The user can act on the equalization module 23 in the form of a knob to achieve the adjustment of the frequency in the guitar signal.

[0060] Among them, the preset frequency bands can be divided into high-frequency bands, mid-frequency bands, and low-frequency bands. In the field of electric guitars, the bass usually refers to the frequency range between 20 Hz and 250 Hz; the midrange usually refers to the frequency range between 250 Hz and 2000 Hz (or 2 kHz). The treble usually refers to the frequency range between 2000 Hz (or 2 kHz) and 20 kHz.

[0061] It should be noted that the division of these frequency ranges is not absolute and sometimes varies due to different music styles, equipment, and personal preferences.

[0062] The power amplification module 24 is used to input the adjusted guitar signal, perform the third amplification on the guitar signal, and output the power-amplified guitar signal.

[0063] Among them, the first preamplification module 21, the second preamplification module 22, and the power amplification module 24 can amplify the voltage or current of the guitar signal, which is specifically determined according to the application requirements or the electrical components for signal amplification. Generally, an electric guitar amplifier amplifies the voltage of the guitar signal, but it does not exclude the possibility of amplifying the current of the guitar signal.

[0064] By adding the equalization module 23, the components of at least two frequency bands in the treble, midrange, and bass of the guitar signal can be adjusted, thereby changing the frequency of the sound finally output by the amplifier, achieving the adjustment of the tone color, making the functions of the electric guitar amplifier more abundant and the applicable scenarios more diverse.

[0065] The following will specifically describe each functional module in the above processing circuit 20.

[0066] As Figure 3 shown, in one embodiment, the first preamplification module 21 may include a first amplifier 210 and a tone color switching module 211, and the tone color switching module 211 is connected to the power supply terminal of the first amplifier 210.

[0067] The guitar signal is input to the control terminal of the first amplifier 210; for example, the first amplifier 210 may include a vacuum tube or a transistor.

[0068] Among them, when used as an amplification device, for an electron tube, the control terminal is the control grid, the control terminal also serves as the input terminal, the output terminal is the anode, and the power supply terminal is the cathode (the electron tube filament heats the cathode, and the cathode generates electrons that flow towards the anode, so in this application, the cathode of the electron tube is defined as the power supply terminal). For a transistor, it can include a triode, a MOS transistor, and an IGBT transistor. For example, for a MOS transistor, the control terminal corresponds to the gate or the base, the control terminal also serves as the input terminal, and the output terminal and the power supply terminal are specifically determined according to whether it is an N-type or a P-type. The second amplifier 220 described below is similar to the power amplifier 240.

[0069] The tone switching module 211 has a switching switch 212 and a resistor-capacitor circuit 213. The switching switch 212 is used to switch the connection relationship between the resistor and the capacitor in the resistor-capacitor circuit 213, providing two different loads connected to the power supply terminal of the first amplifier 210, and adjusting the high-frequency signal and low-frequency signal components in the guitar signal after the first amplification.

[0070] In this application, taking the electron tube as an amplification device as an example for illustration, but it does not exclude the feasibility of the transistor. Electron tubes (also known as vacuum tubes or electron vacuum tubes) were widely used in past audio devices and are still applied in some high-end audio devices and guitar amplifiers. Some advantages of electron tubes include:

[0071] 1. Sound characteristics: Electron tube amplifiers can usually produce warm, soft, and mellow sounds, and this kind of sound texture is considered more musical and charming by many people. Compared with transistor amplifiers, electron tube amplifiers generate richer harmonics when overloaded and are generally considered more charming and dynamic.

[0072] 2. Dynamic range: Electron tube amplifiers have a relatively wide dynamic range and can process a wide range of audio signals without distortion.

[0073] 3. Durability: Electron tubes usually have a relatively long lifespan and are relatively more durable than transistors.

[0074] 4. Adjustability: Electron tube amplifiers usually have more parameters that can be adjusted, which allows users to more finely adjust the sound to meet their personal preferences.

[0075] As Figure 4 shown, the circuit diagram of the first preamplification module 21 provided in this application can be referred to the illustration. It should be noted that the circuit diagram provided in this application is only for illustrating the feasibility of the functional module and is not limited to the circuit diagram provided in this application. The same applies to the circuits provided below. Among them, due to the limitation of the drawing space, the circuits of each module of the processing circuit 20 cannot be placed in the same drawing, and the connection relationships between each module are represented by labels / connection points A1, A2... A10. For example, it isFigure 4 and Figure 6 As shown, the first pre - amplifier module 21 and the second pre - amplifier module 22 are connected through connection points A1 and A2. The circuit connection relationship of the subsequent modules is the same.

[0076] Among them, the first amplifier 210 can use an electron tube, for example, a double - triode electron tube, and the model can be ECC83 or 12AX7. At this time, only one triode of the double - triode electron tube can be used as the first amplifier 210 (such as Figure 4 G1 - A in

[0077] It is electrically connected to an electric guitar through a plug J2, and after passing through a resistor R5, it is input to the control terminal of the first amplifier 210 (such as Figure 4 pin 2 of G1 - A in Figure 4 The tone - switching module 211 is connected to the power - supply terminal of the first amplifier 210, which can be the anode or cathode of the electron tube, and generally is connected to the cathode (such as Figure 4 pin 3 of G1 - A shown in Figure 4 The load of the resistor - capacitor circuit 213 can include resistors and capacitors (such as Figure 4 resistor R6, capacitor C3, and resistor R17 in Figure 1 By toggling the switch 212 (such as

[0078] switch J8 in

[0079] such as Figure 5 shown, in one embodiment, the second pre - amplifier module 22 can include a second amplifier 220 and a gain - adjustment module 221. The gain - adjustment module 221 is connected between the output terminal of the first pre - amplifier module 21 and the control terminal of the second amplifier 220; the guitar signal after the first - stage amplification passes through the gain - adjustment module 221 and then is input to the control terminal of the second amplifier 220.

[0080] The gain - adjustment module 221 is used to adjust the impedance connected to the control terminal of the second amplifier 220.

[0081] For example, the gain - adjustment module 221 can include a potentiometer; and / or, the second amplifier 220 can include an electron tube or a transistor.

[0082] As shown Figure 6 in the figure, the circuit diagram of the second pre-amplification module 22 provided by the present application can be referred to the figure. Among them, the second amplifier 220 can use an electron tube, for example, a double triode electron tube, and the model can be ECC83 or 12AX7. At this time, only the other triode electron tube in the double triode electron tube can be used as the second amplifier 220 (as shown Figure 6 in G1-B of

[0083] . By adjusting the gain adjustment module 221, the load connected to the control end of the second amplifier 220 can be changed, and finally the amplification ratio of the guitar signal after passing through the second amplifier 220 can be adjusted to achieve gain adjustment.

[0084] For example, a potentiometer P1 as shown Figure 6 in the figure is used. By rotating the knob of the potentiometer P1, the resistance can be adjusted, thereby changing the load size connected to the control end of the second amplifier 220.

[0085] The previous stage signal is first subjected to gain control through the potentiometer P1, transmitted to the grid (G pole) of the 7th pin of G1-B, and after amplification, it is output from the anode (A pole) of the 6th pin to the subsequent equalization module 23.

[0086] As shown Figure 7 in the figure, in one embodiment, the equalization module 23 can include three parallel first filtering modules 230.

[0087] The first filtering module 230 is used to filter the input guitar signal in a preset frequency band, and the three first filtering modules 230 respectively filter the high frequency, medium frequency and low frequency.

[0088] In one embodiment, the first filtering module 230 can include a series-connected filtering capacitor 231 and an adjusting potentiometer 232. The filtering capacitor 231 is used to filter the guitar signal in a preset frequency band, and the adjusting potentiometer 232 is used to adjust the filtering ratio. The filtering capacitors 231 of each first filtering module 230 are different. The adjustable resistance range of each adjusting potentiometer 232 can also be different.

[0089] As shown Figure 8 in the figure, the circuit diagram of the equalization module 23 provided by the present application can be referred to the figure. The filtering capacitors 231 corresponding to each frequency band can include capacitor C6, capacitor C7 and capacitor C8, and the corresponding adjusting potentiometers 232 can include potentiometer P2, potentiometer P3 and potentiometer P4. The potentiometers can provide different resistance values to achieve the adjustment of the filtering ratio.

[0090] The previous stage signal passes through the equalization module 23, and the user can obtain different tone outputs by adjusting the potentiometers corresponding to the treble, midrange and bass.

[0091] As Figure 9 shown, in one embodiment, the power amplification module 24 may include a power amplifier 240 and a volume adjustment module 241.

[0092] The volume adjustment module 241 is connected between the output end of the equalization module 23 and the control end of the power amplifier 240; the guitar signal adjusted by the equalization module 23 is input to the control end of the power amplifier 240 after passing through the volume adjustment module 241.

[0093] The volume adjustment module 241 is used to adjust the impedance connected to the control end of the power amplifier 240.

[0094] As Figure 10 shown, the circuit diagram of the power amplification module 24 provided in the present application can be referred to the illustration. The volume adjustment module 241 may include a potentiometer and may also include resistors (such as Figure 10 the potentiometer P5 and the resistor R18 shown), and the power amplifier 240 may include a pentode / power amplification tube (such as Figure 10 the pentode G2 shown, and the model may be EL84). The volume adjustment module 241 is connected to the control end of the power amplifier 240 (corresponding to a grid of the pentode, such as Figure 10 the pin 2 of G2 shown), so as to control the final amplification ratio of the power amplifier 240 and realize the adjustment of the volume.

[0095] The guitar signal amplified by the power amplifier 240 is transformed through the first transformer 30 (such as Figure 10 the transformer T1 shown) to match the working voltage of the speaker 40, and sound is emitted through the speaker 40.

[0096] The signal after the three-band equalizer EQ is transmitted to the potentiometer P5 of the volume adjustment module 241 through the resistor R18, and then enters the grid (G pole) of the power amplification tube G2 at the 2nd pin. After amplification, it is output from the anode (A pole) at the 7th pin. After the impedance is transformed by the output transformer, it is output to the speaker / speaker 40 with the corresponding impedance to emit sound.

[0097] As Figure 1 and Figure 11 shown, in one embodiment, the electric guitar may further include a power supply module 50. The power supply module 50 is used to supply power to the processing circuit 20; the power supply module 50 may include a switching switch circuit 51, a second transformer 52, a rectification module 53, and a second filtering module 54.

[0098] The second transformer 52 is used to connect to an external power supply 60 to transform the AC input voltage.

[0099] The rectification module 53 is used to convert the transformed input voltage into a DC voltage.

[0100] The second filtering module 54 is used to filter the input DC voltage and output the final power supply signal / voltage signal to the processing circuit 20.

[0101] The switching switch circuit 51 is used to switch the number of turns connected to the external power supply 60 in the primary coil of the transformer.

[0102] As Figure 12 shown, the circuit diagram of the switching switch circuit 51 provided in this application and the second transformer 52 can be referred to the illustration. The second transformer 52 (such as Figure 12 the transformer T2 shown) is connected to the external power supply 60 through the switching switch circuit 51. The primary coil of the second voltage transformer can have multiple terminals or multiple sets of coils. Through the switching switch circuit 51, series-parallel connection of multiple sets of coils can be realized, so as to match the voltage of the external power supply 60. For example, the Chinese mains voltage is 220V and the foreign mains voltage is 110V.

[0103] When using an electron tube, power needs to be supplied to the filament of the electron tube. The secondary coil of the second transformer 52 can also include a filament coil for supplying power to the filament, for example, the step-down output is 6.3V.

[0104] As Figure 13 shown, the circuit diagram of the rectification module 53 provided in this application can be referred to the illustration. The rectification module 53 can include an electron tube transistor hybrid bridge rectification circuit, such as Figure 13 the electron tube G3 (the model can be 6Z4) and the diodes D1 and D2 in it. The voltage after being transformed by the transformer T2 is input to pins 1 and 8 of the electron tube G3, and rectification is realized through the diodes D1 and D2.

[0105] As Figure 14 shown, the circuit diagram of the second filtering module 54 provided in this application can be referred to the illustration. The second filtering module 54 can include an electronic filtering tube (such as Figure 14 the triode Q2 in it, the model can be 13007), cooperating with the resistor R15 and the capacitors C14 and C15, and using the input impedance and output impedance characteristics of the triode to realize filtering. When the input signal voltage changes, the current of the triode will also change, so as to realize the filtering of the voltage signal, realize the filtering of the power supply signal / voltage signal, and output through the interface B+ to supply power to the processing circuit 20.

[0106] By setting the 110V / 220V voltage switching circuit, and then using the second transformer 52 to generate 6.3V AC to supply power to the electron tube filament, the high voltage is composed of a rectification circuit and an electronic filter, and a pure DC high voltage is obtained for the circuit to use.

[0107] Compared with the same type of fender 5f2a in the industry (circuit diagram attached at the back), 5f2a only has one gain and one volume control knob, and its usage scenarios are limited. In addition to retaining the gain and volume, the electric guitar amplifier provided in this application adds three adjustment knobs for high, middle, and low frequencies, plus a tone selection switch, and uses an output transformer with a layer-by-layer pad paper process, combined with a fashionable appearance design, making it suitable for more occasions.

[0108] This document is described with reference to various exemplary embodiments. However, those skilled in the art will recognize that changes and modifications can be made to the exemplary embodiments without departing from the scope of this document. For example, various operating steps and the components used to perform the operating steps can be implemented in different ways according to a specific application or any number of cost functions associated with the operation of the system (e.g., one or more steps can be deleted, modified, or incorporated into other steps).

[0109] Although the principles of this document have been shown in various embodiments, many modifications to the structure, arrangement, proportion, components, materials, and parts that are particularly applicable to specific environments and operating requirements can be used without departing from the principles and scope of this disclosure. The above modifications and other changes or corrections will be included within the scope of this document.

[0110] The foregoing detailed description has been described with reference to various embodiments. However, those skilled in the art will recognize that various corrections and changes can be made without departing from the scope of this disclosure. Therefore, the consideration of this disclosure will be in an illustrative rather than a restrictive sense, and all such modifications will be included within its scope. Similarly, the advantages, other advantages, and solutions to problems of various embodiments have been described above. However, benefits, advantages, solutions to problems, and any elements that can produce these, or solutions that make them more explicit, should not be construed as critical, essential, or necessary. The term "comprising" and any other variants used herein are non-exclusive inclusions, such that a process, method, article, or device that includes a list of elements not only includes those elements but also other elements not explicitly listed or belonging to the process, method, system, article, or device. In addition, the term "coupled" and any other variants used herein refer to physical connection, electrical connection, magnetic connection, optical connection, communication connection, functional connection, and / or any other connection.

[0111] Those with ordinary skill in the art will recognize that many changes can be made to the details of the above embodiments without departing from the basic principles of the present invention. Therefore, the scope of the present invention should be determined only by the claims.

Claims

1. A guitar signal processing circuit, characterized in that: include: A first pre-amplification module (21) is used to input the guitar signal output by the pickup (10), perform a first amplification on the guitar signal, and output the guitar signal after the first amplification; A second pre-amplification module (22) is used to input the guitar signal after the first amplification, amplify the guitar signal for the second time, and output the guitar signal after the second amplification; An equalization module (23) is used to adjust the components of at least two preset frequency bands in the second amplified guitar signal and output the adjusted guitar signal; The power amplification module (24) is used to input the regulated guitar signal, perform a third amplification on the guitar signal, and output the power-amplified guitar signal.

2. The processing circuit according to claim 1, characterized in that The equalization module (23) comprises three first filtering modules (230) connected in parallel; The first filtering module (230) is used to filter the input guitar signal in a preset band, and the three first filtering modules (230) filter the high frequency, the middle frequency and the low frequency respectively.

3. The processing circuit according to claim 2, characterized in that The first filter module (230) comprises a filter capacitor (231) and an adjustment potentiometer (232) connected in series, the filter capacitor (231) is used to filter the guitar signal in a preset band, and the adjustment potentiometer (232) is used to adjust the filtering ratio, and the filter capacitor (231) of each first filter module (230) is different.

4. The processing circuit according to claim 1, characterized in that The first pre-amplification module (21) comprises a first amplifier (210) and a tone switching module (211), wherein the tone switching module (211) is connected to a power supply end of the first amplifier (210); The guitar signal is input to the control end of the first amplifier (210); The tone switching module (211) comprises a switching switch (212) and a resistor-capacitor circuit (213), wherein the switching switch (212) is used to switch the connection relationship between the resistor and the capacitor in the resistor-capacitor circuit (213), provide two different loads connected to the power supply end of the first amplifier (210), and adjust the high-frequency signal and low-frequency signal components in the guitar signal after the first amplification.

5. The processing circuit according to claim 4, characterized in that The first amplifier (210) includes an electron tube or a transistor.

6. The processing circuit according to claim 1, characterized in that The second pre-amplification module (22) comprises a second amplifier (220) and a gain adjustment module (221), wherein the gain adjustment module (221) is connected between the output end of the first pre-amplification module (21) and the control end of the second amplifier (220); the guitar signal after the first amplification passes through the gain adjustment module (221) and is input to the control end of the second amplifier (220); The gain adjustment module (221) is used to adjust the impedance of the control end connected to the second amplifier (220).

7. The processing circuit according to claim 6, characterized in that The gain adjustment module (221) includes a potentiometer; and / or the second amplifier (220) includes an electron tube or a transistor.

8. The processing circuit according to claim 1, characterized in that: The power amplification module (24) comprises a power amplifier (240) and a volume adjustment module (241); The volume adjustment module (241) is connected between the output end of the equalization module (23) and the control end of the power amplifier (240); the guitar signal adjusted by the equalization module (23) is input into the control end of the power amplifier (240) after passing through the volume adjustment module (241); The volume adjustment module (241) is used to adjust the impedance of the control end connected to the power amplifier (240).

9. An electric guitar speaker, characterized in that: include: The processing circuit (20) of any one of claims 1 to 8 is used to input a guitar signal, process it, and output a guitar signal after power amplification; A first transformer (30) is used to transform the guitar signal after power amplification and output the transformed guitar signal to a speaker (40); A loudspeaker (40) is used for producing sound when driven by the guitar signal after voltage transformation.

10. The electric guitar speaker as claimed in claim 9, characterized in that: The electric guitar speaker box further comprises a power supply module (50), wherein the power supply module (50) is used to supply power to the processing circuit (20); the power supply module (50) comprises a switching circuit (51), a second transformer (52), a rectifier module (53) and a second filter module (54); The second transformer (52) is used to connect to an external power source (60) to transform the AC input voltage; The rectifier module (53) is used to convert the transformed input voltage into a DC voltage; The second filtering module (54) is used to filter the DC input voltage; The switching circuit (51) is used to switch the number of turns in the primary coil of the transformer connected to the external power source (60).

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