CN211554921U - Switching circuit of sound input device and electronic device - Google Patents
Switching circuit of sound input device and electronic device Download PDFInfo
- Publication number
- CN211554921U CN211554921U CN202020719604.2U CN202020719604U CN211554921U CN 211554921 U CN211554921 U CN 211554921U CN 202020719604 U CN202020719604 U CN 202020719604U CN 211554921 U CN211554921 U CN 211554921U
- Authority
- CN
- China
- Prior art keywords
- resistor
- capacitor
- input device
- sound input
- impedance matching
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Amplifiers (AREA)
Abstract
The utility model discloses a switching circuit and electronic equipment of sound input equipment. The switching circuit of the sound input device comprises an impedance matching unit and an output unit; the input end of the impedance matching unit is connected with the first sound input device or the second sound input device, the detection end and the switching control end of the impedance matching unit are both connected with the controller, the output end of the impedance matching unit is connected with the input end of the output unit, and the impedance matching unit is used for correspondingly carrying out impedance matching on an access signal of the first sound input device or the second sound input device and then sending the access signal to the output unit when the first sound input device or the second sound input device is accessed; the output unit is used for outputting the access signal after impedance matching. Through the circuit design of the scheme, the common input interface of the sound input equipment with different output impedance can be realized, the product volume is reduced, and the market competitiveness of the product is improved.
Description
Technical Field
The utility model relates to the field of electronic technology, especially, relate to a switching circuit and electronic equipment of sound input equipment.
Background
With the development of electronic technology, the integration level of electronic equipment is higher and higher, for example, a plurality of sound input devices such as a microphone and a guitar are compatible in a sound system or a power amplification system, so that the product meets the requirements of more users.
However, since the output impedances of different sound input devices are different, electronic devices generally need to adopt independent input interfaces as input sources in order to be compatible with different sound input devices, resulting in a large volume of electronic products. For example, in a traditional sound or power amplifier system with microphone and guitar inputs, because the microphone and the guitar output impedance and signal strength are different, the input port cannot be shared, so that there are many input ports, the product shape is large, and the product ID (industrial design) is relatively limited. Especially when product functionality is defined as requiring 2 sets of microphone inputs and 1 or 2 sets of guitar functions, the use of conventional designs requires 3 or 4 dedicated interfaces of 6.3mm diameter, which increases product size.
SUMMERY OF THE UTILITY MODEL
A primary object of the present invention is to provide a switching circuit and an electronic device for a sound input device, which are capable of solving the technical problem of the prior art that the volume of the product is increased due to the input interface of the sound input device with different output impedances.
In order to achieve the above object, the present invention provides a switching circuit of a sound input device, the circuit including an impedance matching unit and an output unit; wherein the content of the first and second substances,
the input end of the impedance matching unit is connected with a first sound input device or a second sound input device, the detection end and the switching control end of the impedance matching unit are both connected with the controller, the output end of the impedance matching unit is connected with the input end of the output unit, and the impedance matching unit is used for correspondingly carrying out impedance matching on an access signal of the first sound input device or the second sound input device and then sending the access signal to the output unit when the first sound input device or the second sound input device is accessed;
and the output unit is used for outputting the access signal after impedance matching.
Preferably, the impedance matching unit includes an input interface, a first resistor, a second resistor, a third resistor, and an MOS transistor; wherein the content of the first and second substances,
the input interface is respectively connected with the first sound input device or the second sound input device, the controller, the first end of the first resistor, the first end of the second resistor, the input end of the output unit and the ground;
the second end of the first resistor is grounded;
the second end of the second resistor is connected with the drain electrode of the MOS tube;
the grid electrode of the MOS tube is respectively connected with the controller and the first end of the third resistor, and the source electrode of the MOS tube is grounded;
and the second end of the third resistor is grounded.
Preferably, the impedance matching unit further includes an electrostatic protection diode and a first capacitor; the electrostatic protection diode is connected with the first capacitor in parallel, the first end of the first capacitor is respectively connected with the input interface and the first end of the first resistor, and the second end of the first capacitor is grounded.
Preferably, the impedance matching unit further includes a second capacitor; the first end of the second capacitor is connected with the input interface and the controller respectively, and the second end of the second capacitor is grounded.
Preferably, the output unit includes a fourth resistor, a third capacitor and a first output end; and the first end of the fourth resistor is connected with the first end of the first resistor, and the second end of the fourth resistor is connected with the first output end through the third capacitor.
Preferably, the switching circuit of the sound input device further includes a first amplifying unit and a second amplifying unit; the input end of the first amplifying unit is connected with the output end of the output unit, and the output end of the first amplifying unit is connected with the input end of the second amplifying unit; wherein the content of the first and second substances,
the first amplifying unit is used for performing gain processing on the access signal after impedance matching to obtain a first signal;
and the second amplifying unit is used for receiving the first signal, adjusting the volume of the first signal and amplifying the first signal to obtain a second signal and outputting the second signal.
Preferably, the switching circuit of the sound input device further includes a first amplifying unit and a second amplifying unit; the input end of the first amplifying unit is connected with the output end of the output unit, and the output end of the first amplifying unit is connected with the input end of the second amplifying unit; wherein the content of the first and second substances,
the first amplifying unit is used for performing gain processing on the access signal after impedance matching to obtain a first signal;
and the second amplifying unit is used for receiving the first signal, adjusting the volume of the first signal and amplifying the first signal to obtain a second signal and outputting the second signal.
Preferably, the first amplifying unit includes a fourth capacitor, a fifth resistor, a sixth resistor, and a first operational amplifier; wherein the content of the first and second substances,
the fourth capacitor is connected in parallel with the fifth resistor, a first end of the fifth resistor is connected with the output end of the impedance matching unit and the inverting input end of the first operational amplifier respectively, and a second end of the fifth resistor is connected with the output end of the first operational amplifier and the first end of the fifth capacitor respectively;
the non-inverting input end of the first operational amplifier is grounded through the sixth resistor;
and the second end of the fifth capacitor is connected with the input end of the second amplifying unit.
Preferably, the second amplifying unit includes a volume adjustment potentiometer, a sixth capacitor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, a second operational amplifier, and a second output end; wherein the content of the first and second substances,
the shell of the volume adjustment potentiometer is grounded, the input end of the volume adjustment potentiometer is connected with the second end of the five capacitors, and the output end of the volume adjustment potentiometer is connected with the first end of the sixth capacitor;
the second end of the sixth capacitor is connected with the first end of the seventh resistor;
a second end of the seventh resistor is connected with a first end of the eighth resistor and an inverting input end of the second operational amplifier respectively;
the output end of the second operational amplifier is respectively connected with the second end of the eighth resistor and the first end of the ninth resistor, and the non-inverting input end of the second operational amplifier is grounded through the tenth resistor;
and the second end of the ninth resistor is connected with the second output end through the seventh capacitor.
Preferably, the first amplifying unit further includes an eighth capacitor, and the second amplifying unit further includes a ninth capacitor and a tenth capacitor; wherein the content of the first and second substances,
a first end of the eighth capacitor is connected with an inverting input end of the first operational amplifier, and a second end of the eighth capacitor is grounded;
a first end of the ninth capacitor is connected with a second end of the seventh resistor and a first end of the eighth resistor respectively, and a second end of the ninth capacitor is grounded;
the tenth capacitor is connected in parallel with the eighth resistor.
The utility model also provides an electronic equipment, electronic equipment includes as above sound input equipment's switching circuit.
The utility model arranges an impedance matching unit and an output unit in the switching circuit of the sound input device; the input end of the impedance matching unit is connected with the first sound input device or the second sound input device, the detection end and the switching control end of the impedance matching unit are both connected with the controller, the output end of the impedance matching unit is connected with the input end of the output unit, and the impedance matching unit is used for correspondingly carrying out impedance matching on an access signal of the first sound input device or the second sound input device and then sending the access signal to the output unit when the first sound input device or the second sound input device is accessed; the output unit is used for outputting the access signal after impedance matching. Through the circuit design of the scheme, the common input interface of the sound input equipment with different output impedance can be realized, the product volume is reduced, and the market competitiveness of the product is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
Fig. 1 is a functional block diagram of an embodiment of a switching circuit of the sound input device of the present invention;
FIG. 2 is a schematic diagram of an alternative configuration of the switching circuit of the audio input device of FIG. 1;
fig. 3 is a schematic diagram of an alternative configuration of the switching circuit of the sound input device of fig. 1.
The reference numbers illustrate:
the objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
It should be noted that, if directional indications (such as upper, lower, left, right, front and rear … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are changed accordingly.
In addition, if there is a description relating to "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should not be considered to exist, and is not within the protection scope of the present invention.
The utility model provides a switching circuit of sound input equipment.
Referring to fig. 1, in an embodiment, the circuit includes an impedance matching unit 110 and an output unit 120; the input end of the impedance matching unit 110 is connected to a first sound input device or a second sound input device, the detection end INSERT _ DETEL and the switching control end SELECT of the impedance matching unit 110 are both connected to the controller MCU, the output end of the impedance matching unit 110 is connected to the input end of the output unit 120, and the impedance matching unit 110 is configured to, when the first sound input device or the second sound input device is connected, perform impedance matching on an access signal of the first sound input device or the second sound input device and then send the access signal to the output unit 120; the output unit 120 is configured to output the access signal after impedance matching.
It should be understood that the first and second sound input devices refer to two sound input devices having different impedances, such as the first sound input device being a guitar, the second sound input device being a microphone, etc.
It should be noted that, because the first sound input device and the second sound input device have different output impedances and signal strengths, the conventional electronic device with the first sound input device and the second sound input device needs to use independent input interfaces as inputs, and through the design of the impedance matching unit 110, when the input terminal of the impedance matching unit 110 is connected to the first sound input device, the detection terminal INSERT _ DETEL of the impedance matching unit 110 sends a signal to the controller MCU, the controller MCU outputs a high level to turn on the back-end circuit of the output unit 120, a level signal is output to the switch control terminal SELECT of the impedance matching unit 110, one path of signal in the access signal of the first sound input device is controlled to realize input impedance matching of the first sound input device, and the other path of signal is input to the back-end circuit through the output unit 120 to perform back-end signal processing of the first sound input device; when the input end of the impedance matching unit 110 is connected to the second sound input device, the detection terminal INSERT _ DETEL of the impedance matching unit 110 sends a signal to the controller MCU, the controller MCU outputs a high level to turn on the back-end circuit of the output unit 120, and outputs a level signal to the switching control terminal SELECT of the impedance matching unit 110, so as to control one path of signals in the connection signals of the second sound input device to implement input impedance matching of the second sound input device, and the other path of signals is input to the back-end circuit through the output unit 120 to perform back-end signal processing of the second sound input device.
Referring to fig. 1 and fig. 2 together, fig. 2 is a schematic diagram of an alternative structure of a switching circuit of the sound input device.
In a specific implementation, the impedance matching unit 110 includes an input interface P1, a first resistor R1, a second resistor R2, a third resistor R3, and a MOS transistor Q1; wherein the input interface P1 is respectively connected to the first sound input device or the second sound input device, the controller MCU, the first terminal of the first resistor R1, the first terminal of the second resistor R2, the input terminal of the output unit 120, and ground; a second end of the first resistor R1 is grounded; a second end of the second resistor R2 is connected with the drain of the MOS transistor Q1; the gate of the MOS transistor Q1 is connected to the controller MCU and the first end of the third resistor R3, respectively, and the source of the MOS transistor Q1 is grounded; the second end of the third resistor R3 is grounded.
The output unit 120 comprises a fourth resistor R4, a third capacitor C3 and a first output terminal OUT 1; a first terminal of the fourth resistor R4 is connected to a first terminal of the first resistor R1, and a second terminal of the fourth resistor R4 is connected to the first output terminal OUT1 via the third capacitor C3.
Taking the first sound input device as a guitar and the second sound input device as a microphone as an example, when the input interface P1 is connected to the guitar, the 1 st pin and the grounded 2 nd pin of the input interface P1 bounce open, the detection terminal INSERT _ DETEL of the impedance matching unit 110 sends a signal to the controller MCU, the controller MCU outputs a high level to turn on the back-end circuit of the output unit 120, and outputs a low level to the switch control terminal SELECT of the impedance matching unit 110, and the MOS transistor Q1 is not turned on. The guitar access signal is input from the 3 rd pin of the input interface P1, one path of the access signal is matched with the guitar input impedance through the first resistor R1, and the other path of the access signal is input into the back-end circuit through the fourth resistor R4, the third capacitor C3 and the first output end OUT1 to be amplified, adjusted in volume and processed in the guitar back-end signal.
When the input interface P1 is connected to a microphone, the 1 st pin of the input interface P1 and the 2 nd pin of the ground bounce, the detection terminal INSERT _ DETEL of the impedance matching unit 110 sends a signal to the controller MCU, the controller MCU outputs a high level to turn on the back-end circuit of the output unit 120 and outputs a high level to the switch control terminal SELECT of the impedance matching unit 110, the MOS transistor Q1 is turned on, and the first resistor R1 and the second resistor R2 form a parallel loop. An access signal of the microphone is input from a pin 3 of an input interface P1, one path of the access signal is connected in parallel to form microphone input impedance matching through a first resistor R1 and a second resistor R2, and the other path of the access signal is input into a back-end circuit through a fourth resistor R4, a third capacitor C3 and a first output end OUT1 to be amplified, volume adjusted and signal processed at the back end of the guitar.
As an embodiment, the impedance matching unit 110 further includes an ESD1 and a first capacitor C1; the ESD1 is connected in parallel to the first capacitor C1, a first end of the first capacitor C1 is connected to the input interface P1 and a first end of the first resistor R1, respectively, and a second end of the first capacitor C1 is grounded.
It should be understood that the electrostatic protection diode ESD1 is connected in parallel in the circuit, when the circuit works normally, it is in high resistance state to stop, and does not affect the normal work of the circuit, when the circuit has abnormal overvoltage and reaches its breakdown voltage, it changes from high resistance state to low resistance state rapidly, to provide low resistance conduction path for the instantaneous current, and at the same time clamp the abnormal high voltage within the safe voltage, thereby protecting the circuit; when the abnormal overvoltage disappears, the circuit is restored to a high-resistance state, and the circuit works normally. By adding the electrostatic protection diode ESD1 and the first capacitor C1, the circuit can be effectively protected, and noise waves in an access signal can be filtered.
Optionally, the impedance matching unit 110 further includes a second capacitor C2; a first end of the second capacitor C2 is connected to the input interface P1 and the controller MCU, respectively, and a second end of the second capacitor C2 is grounded.
It should be noted that, at the moment of inserting the sound input device, mechanical vibration may be generated, and the addition of the second capacitor C2 may effectively achieve interference resistance of the signal transmitted from the input interface P1 to the controller MCU.
The present embodiment is achieved by providing an impedance matching unit and an output unit in a switching circuit of a sound input device; the input end of the impedance matching unit is connected with the first sound input device or the second sound input device, the detection end and the switching control end of the impedance matching unit are both connected with the controller, the output end of the impedance matching unit is connected with the input end of the output unit, and the impedance matching unit is used for correspondingly carrying out impedance matching on an access signal of the first sound input device or the second sound input device and then sending the access signal to the output unit when the first sound input device or the second sound input device is accessed; the output unit is used for outputting the access signal after impedance matching. Through the circuit design of the scheme, the common input interface of the sound input equipment with different output impedance can be realized, the product volume is reduced, and the market competitiveness of the product is improved.
Referring to fig. 3, fig. 3 is a schematic diagram of another alternative structure of the switching circuit of the sound input device shown in fig. 2.
In a specific implementation, the switching circuit of the sound input device further includes a first amplifying unit 130 and a second amplifying unit 140; the input end of the first amplifying unit 130 is connected to the output end of the output unit 120, and the output end of the first amplifying unit 130 is connected to the input end of the second amplifying unit 140; the first amplifying unit 130 is configured to perform gain processing on the access signal after impedance matching to obtain a first signal; the second amplifying unit 140 is configured to receive the first signal, perform volume adjustment and amplification processing on the first signal, obtain a second signal, and output the second signal.
Further, the first amplifying unit 130 includes a fourth capacitor C4, a fifth capacitor C5, a fifth resistor R5, a sixth resistor R6, and a first operational amplifier U1; the fourth capacitor C4 is connected in parallel with the fifth resistor R5, a first end of the fifth resistor R5 is connected to the output end of the impedance matching unit 110 and the inverting input end of the first operational amplifier U1, respectively, and a second end of the fifth resistor R5 is connected to the output end of the first operational amplifier U1 and a first end of the fifth capacitor C5, respectively; the non-inverting input terminal of the first operational amplifier U1 is connected to ground through the sixth resistor R6; a second terminal of the fifth capacitor C5 is connected to the input terminal of the second amplifying unit 140.
The second amplifying unit 140 includes a volume adjustment potentiometer RP, a sixth capacitor C6, a seventh capacitor C7, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, a second operational amplifier U2, and a second output terminal OUT 2; the shell of the volume adjustment potentiometer RP is grounded, the input end of the volume adjustment potentiometer RP is connected with the second end of the five capacitors, and the output end of the volume adjustment potentiometer RP is connected with the first end of the sixth capacitor C6; a second end of the sixth capacitor C6 is connected with a first end of the seventh resistor R7; a second end of the seventh resistor R7 is connected to a first end of the eighth resistor R8 and an inverting input terminal of the second operational amplifier U2, respectively; the output end of the second operational amplifier U2 is connected to the second end of the eighth resistor R8 and the first end of the ninth resistor R9, respectively, and the non-inverting input end of the second operational amplifier U2 is grounded via the tenth resistor R10; a second terminal of the ninth resistor R9 is connected to the second output terminal OUT2 via the seventh capacitor C7.
Taking the first sound input device as a guitar and the second sound input device as a microphone as an example, considering that the maximum signal output by the guitar can reach 1Vp-p, when the guitar is connected to the circuit, the voltage of the first operational amplifier U1, the resistance of the fourth resistor R4 and the resistance of the fifth resistor R5 need to be combined to perform parameter setting so as to perform reasonable gain control, so that the circuit can avoid front saturation distortion when the guitar is input, and also can simultaneously take account of the characteristic of small microphone signal.
As an embodiment, the resistance of the fourth resistor R4 and the resistance of the fifth resistor R5 may be set to be equal, for example, 510K Ω, and the voltage of the first operational amplifier U1 is 6V, so that the first amplifying unit 130 only buffers the signal output by the output unit 120 and the second amplifying unit 140 performs the volume adjustment and amplification.
It should be noted that, considering that the guitar signal has a relatively wide range, in this embodiment, neither the first amplifying unit 130 nor the second amplifying unit 140 uses an element or a circuit for high frequency attenuation filtering in a conventional microphone circuit, so that it is effectively avoided that the sound of the guitar is dry and not full due to signal loss.
Optionally, the first amplifying unit 130 further includes an eighth capacitor C8, and the second amplifying unit 140 further includes a ninth capacitor C9 and a tenth capacitor C10; a first end of the eighth capacitor C8 is connected with an inverting input end of the first operational amplifier U1, and a second end of the eighth capacitor C8 is grounded; a first end of the ninth capacitor C9 is connected to the second end of the seventh resistor R7 and the first end of the eighth resistor R8, respectively, and a second end of the ninth capacitor C9 is grounded; the tenth capacitor C10 is connected in parallel with the eighth resistor R8.
It is understood that when the first amplifying unit 130 and the second amplifying unit 140 are applied to other scenes, the eighth capacitor C8 may be added to the first amplifying unit 130, the ninth capacitor C9 and the tenth capacitor C10 may be added to the second amplifying unit 140, and the parameters of the eighth capacitor C8, the ninth capacitor C9 and the tenth capacitor C10 may be set according to specific situations.
This embodiment is through still setting up first amplification unit and second amplification unit in the switching circuit at sound input device, combine impedance matching unit to realize gain control and volume control to output unit output signal jointly, make sound effect processing circuit such as first sound input device and second sound input device ability sharing input interface and amplification, can satisfy the stereo set or the power amplifier product that design restriction because of product volume or product ID realizes supporting first sound input device and second sound input device input function simultaneously, and because circuit design has significantly reduced the use of components and parts, the product cost is reduced, the competitiveness of product in the market has further been improved.
The present invention further provides an electronic device, wherein the electronic device includes the switching circuit of the sound input device, and the circuit structure of the switching circuit of the sound input device of the electronic device can refer to the above embodiments, which are not repeated herein; it can be understood that, since the electronic device of the present embodiment adopts the technical solution of the switching circuit of the sound input device, the electronic device has all the above beneficial effects; it should be understood that the electronic device may be a sound device, a power amplifier, and the like, which is not limited in this embodiment.
The above is only the preferred embodiment of the present invention, and not the scope of the present invention, all the equivalent structures or equivalent flow changes made by the contents of the specification and the drawings or the direct or indirect application in other related technical fields are included in the patent protection scope of the present invention.
Claims (10)
1. A switching circuit of a sound input apparatus includes an impedance matching unit and an output unit; wherein the content of the first and second substances,
the input end of the impedance matching unit is connected with a first sound input device or a second sound input device, the detection end and the switching control end of the impedance matching unit are both connected with the controller, the output end of the impedance matching unit is connected with the input end of the output unit, and the impedance matching unit is used for correspondingly carrying out impedance matching on an access signal of the first sound input device or the second sound input device and then sending the access signal to the output unit when the first sound input device or the second sound input device is accessed;
and the output unit is used for outputting the access signal after impedance matching.
2. The switching circuit of sound input device according to claim 1, wherein the impedance matching unit includes an input interface, a first resistor, a second resistor, a third resistor and a MOS transistor; wherein the content of the first and second substances,
the input interface is respectively connected with the first sound input device or the second sound input device, the controller, the first end of the first resistor, the first end of the second resistor, the input end of the output unit and the ground;
the second end of the first resistor is grounded;
the second end of the second resistor is connected with the drain electrode of the MOS tube;
the grid electrode of the MOS tube is respectively connected with the controller and the first end of the third resistor, and the source electrode of the MOS tube is grounded;
and the second end of the third resistor is grounded.
3. The switching circuit of a sound input device according to claim 2, wherein the impedance matching unit further comprises an electrostatic protection diode and a first capacitor; the electrostatic protection diode is connected with the first capacitor in parallel, the first end of the first capacitor is respectively connected with the input interface and the first end of the first resistor, and the second end of the first capacitor is grounded.
4. The switching circuit of a sound input device according to claim 3, wherein the impedance matching unit further comprises a second capacitance; the first end of the second capacitor is connected with the input interface and the controller respectively, and the second end of the second capacitor is grounded.
5. The switching circuit of a sound input device according to any one of claims 2 to 4, wherein the output unit includes a fourth resistor, a third capacitor, and a first output terminal; and the first end of the fourth resistor is connected with the first end of the first resistor, and the second end of the fourth resistor is connected with the first output end through the third capacitor.
6. The switching circuit of a sound input device according to claim 1, wherein the switching circuit of a sound input device further comprises a first amplifying unit and a second amplifying unit; the input end of the first amplifying unit is connected with the output end of the output unit, and the output end of the first amplifying unit is connected with the input end of the second amplifying unit; wherein the content of the first and second substances,
the first amplifying unit is used for performing gain processing on the access signal after impedance matching to obtain a first signal;
and the second amplifying unit is used for receiving the first signal, adjusting the volume of the first signal and amplifying the first signal to obtain a second signal and outputting the second signal.
7. The switching circuit of a sound input device according to claim 6, wherein the first amplification unit includes a fourth capacitor, a fifth resistor, a sixth resistor, and a first operational amplifier; wherein the content of the first and second substances,
the fourth capacitor is connected in parallel with the fifth resistor, a first end of the fifth resistor is connected with the output end of the impedance matching unit and the inverting input end of the first operational amplifier respectively, and a second end of the fifth resistor is connected with the output end of the first operational amplifier and the first end of the fifth capacitor respectively;
the non-inverting input end of the first operational amplifier is grounded through the sixth resistor;
and the second end of the fifth capacitor is connected with the input end of the second amplifying unit.
8. The switching circuit of an audio input device according to claim 7, wherein the second amplifying unit comprises a volume adjustment potentiometer, a sixth capacitor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, a second operational amplifier, and a second output terminal; wherein the content of the first and second substances,
the shell of the volume adjustment potentiometer is grounded, the input end of the volume adjustment potentiometer is connected with the second end of the five capacitors, and the output end of the volume adjustment potentiometer is connected with the first end of the sixth capacitor;
the second end of the sixth capacitor is connected with the first end of the seventh resistor;
a second end of the seventh resistor is connected with a first end of the eighth resistor and an inverting input end of the second operational amplifier respectively;
the output end of the second operational amplifier is respectively connected with the second end of the eighth resistor and the first end of the ninth resistor, and the non-inverting input end of the second operational amplifier is grounded through the tenth resistor;
and the second end of the ninth resistor is connected with the second output end through the seventh capacitor.
9. The switching circuit of a sound input device according to claim 8, wherein the first amplification unit further includes an eighth capacitor, and the second amplification unit further includes a ninth capacitor and a tenth capacitor; wherein the content of the first and second substances,
a first end of the eighth capacitor is connected with an inverting input end of the first operational amplifier, and a second end of the eighth capacitor is grounded;
a first end of the ninth capacitor is connected with a second end of the seventh resistor and a first end of the eighth resistor respectively, and a second end of the ninth capacitor is grounded;
the tenth capacitor is connected in parallel with the eighth resistor.
10. An electronic device characterized by comprising a switching circuit of a sound input device as claimed in any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020719604.2U CN211554921U (en) | 2020-04-30 | 2020-04-30 | Switching circuit of sound input device and electronic device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020719604.2U CN211554921U (en) | 2020-04-30 | 2020-04-30 | Switching circuit of sound input device and electronic device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211554921U true CN211554921U (en) | 2020-09-22 |
Family
ID=72497081
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020719604.2U Active CN211554921U (en) | 2020-04-30 | 2020-04-30 | Switching circuit of sound input device and electronic device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211554921U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113131931A (en) * | 2021-04-27 | 2021-07-16 | 中安智联未来有限公司 | Analog input and output hybrid circuit |
-
2020
- 2020-04-30 CN CN202020719604.2U patent/CN211554921U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113131931A (en) * | 2021-04-27 | 2021-07-16 | 中安智联未来有限公司 | Analog input and output hybrid circuit |
| CN113131931B (en) * | 2021-04-27 | 2024-05-07 | 中安智联未来有限公司 | Analog input/output hybrid circuit |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP2329658B1 (en) | Circuit arrangement for providing an analog signal, and electronic apparatus | |
| CN101790122A (en) | Plosive eliminating circuit of audio system and mobile communication terminal | |
| CN211554921U (en) | Switching circuit of sound input device and electronic device | |
| TW201345087A (en) | Earphone detection circuit and electronic device using the same | |
| US8090121B2 (en) | Audio adapter having volume adjusting function | |
| CN203933898U (en) | A kind of VGA CARD is eliminated circuit and active noise reduction earphone | |
| WO2020168993A1 (en) | Signal processing circuit and audio power amplifying circuit | |
| CN106373586A (en) | Noise filtering circuit | |
| CN212936178U (en) | Audio output circuit, audio device and sound box | |
| CN214045985U (en) | Audio gain switching circuit and sound equipment | |
| CN108200519A (en) | A kind of microphone and promotion overload acoustic pressure method | |
| CN202103828U (en) | Switching circuit with speaker output being compatible to earphone output and earphone input | |
| CN201142670Y (en) | Adjustable high-sensibility high-resolution audio-detector | |
| CN212115273U (en) | Signal amplifying circuit and device | |
| CN101409855A (en) | Earphone adapting apparatus | |
| KR910006052B1 (en) | Transient voice pressure preventing circuit in telephone | |
| CN214256492U (en) | Signal input/output switching control circuit and projector | |
| CN215935077U (en) | Automatic volume control circuit, headphone and in-ear headphone | |
| CN218850735U (en) | Integrated amplifying circuit of audio signal and terminal equipment | |
| CN220798492U (en) | Electret microphone control circuit and electret microphone | |
| CN209218050U (en) | Stereo emulator based on RC double-T network | |
| CN214125519U (en) | Audio matching control circuit | |
| CN204906663U (en) | Microphone device and sound system | |
| CN213186525U (en) | Audio input circuit and electronic equipment | |
| CN215499546U (en) | Audio input circuit and earphone |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |