CN210225729U - Microphone input circuit - Google Patents
Microphone input circuit Download PDFInfo
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- CN210225729U CN210225729U CN201921467910.5U CN201921467910U CN210225729U CN 210225729 U CN210225729 U CN 210225729U CN 201921467910 U CN201921467910 U CN 201921467910U CN 210225729 U CN210225729 U CN 210225729U
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Abstract
The utility model discloses a microphone input circuit, which comprises a DSP module, a microphone signal input module and a microphone signal output module, wherein the microphone signal input module comprises a microphone input interface, a microphone output interface, a magnetic bead circuit unit, a partition circuit unit, a power supply switch control circuit unit, a pull-down resistance circuit unit and a differential output circuit unit; and magnetic beads are arranged in the magnetic bead circuit unit, and pull-down resistors are arranged in the pull-down resistor circuit unit. The microphone comprises a magnetic bead circuit unit, a pull-down resistor circuit unit, a microphone output interface, a differential output circuit unit and a microphone output interface, wherein the magnetic bead circuit unit is internally provided with a magnetic bead for preventing electromagnetic interference; therefore, the utility model discloses the interference killing feature is strong, has guaranteed the normal use of microphone, has strengthened user experience greatly.
Description
Technical Field
The utility model relates to a microphone technical field, in particular to microphone input circuit.
Background
At present, for microphones on the market, because its circuit structure is comparatively simple, the interference killing feature is relatively poor when using to can influence the normal use of microphone, influence user experience.
SUMMERY OF THE UTILITY MODEL
The utility model discloses an at least solve one of the technical problem who exists among the prior art, provide a microphone input circuit, the interference killing feature is strong, has guaranteed the normal use of microphone, has strengthened user experience greatly.
The utility model provides a microphone input circuit, including DSP module, more than one microphone signal input module and microphone signal output module, one microphone signal input module corresponds one microphone signal output module, microphone signal input module is connected to microphone signal output module through the DSP module; the microphone signal input module comprises a microphone input interface, a microphone output interface, a magnetic bead circuit unit for preventing electromagnetic interference, a cut-off circuit unit for cutting off direct current, a power supply switch circuit unit for supplying power, a power supply switch control circuit unit for controlling power supply, a pull-down resistance circuit unit for preventing impact noise during power-on and a differential output circuit unit for reducing external interference, wherein the microphone input interface sequentially passes through the magnetic bead circuit unit, the cut-off circuit unit, the differential output circuit unit and the microphone output interface are connected to the DSP module, the power supply switch control circuit unit is connected to the power supply switch circuit unit, the power supply switch circuit unit is further connected to the magnetic bead circuit unit and between the cut-off circuit units, one end of the pull-down resistance circuit unit is connected to the power supply switch circuit unit, the other end of the differential output circuit unit is connected between the isolating circuit unit and the differential output circuit unit; the magnetic bead circuit unit is internally provided with a magnetic bead for preventing electromagnetic interference, and the pull-down resistor circuit unit is internally provided with a pull-down resistor for preventing impact noise during electrification.
According to a microphone input circuit, cut off and be provided with in the circuit unit and be used for cutting off direct current blocking electric capacity.
According to a microphone input circuit, be provided with the RC filtering combination that is used for preventing the impulsive sound when switching on and shutting down in the power switch control circuit unit.
According to a microphone input circuit, be provided with in the power switch circuit unit and be used for preventing the PNP pipe that is used for playing the power switch effect the current-limiting resistance that PNP pipe damaged.
According to the microphone input circuit of the present invention, the microphone signal output module includes a left channel output module and a right channel output module; the left sound channel output module comprises a left sound channel input interface, a left sound channel audio amplification unit and a left sound channel output interface, and the DSP module is connected to the left sound channel output interface sequentially through the left sound channel input interface and the left sound channel audio amplification unit; the right channel output module comprises a right channel input interface, a right channel audio amplification unit and a right channel output interface, and the DSP module is connected to the right channel output interface sequentially through the right channel input interface and the right channel audio amplification unit.
The utility model discloses a microphone input circuit has following beneficial effect at least: the utility model discloses a microphone input circuit, including DSP module, microphone signal input module and microphone signal output module, microphone signal input module includes microphone input interface, microphone output interface, a magnetic bead circuit unit for preventing electromagnetic interference, a cut-off circuit unit for cutting off direct current, a power supply switch circuit unit for supplying power, a power supply switch control circuit unit for controlling the power supply, a pull-down resistance circuit unit for preventing the impulsive noise when powering on, a differential output circuit unit for reducing the external interference; the magnetic bead circuit unit is internally provided with a magnetic bead for preventing electromagnetic interference, and the pull-down resistor circuit unit is internally provided with a pull-down resistor for preventing impact noise during electrification. The utility model discloses in, there are three anti-jamming structures, the first place has set up the magnetic bead that is used for preventing electromagnetic interference in magnetic bead circuit unit, the second place has set up the pull-down resistance that is used for preventing to appear impulse noise when power-on in pulling down resistance circuit unit, the third place is the difference output circuit unit that is used for making signal output reduce external disturbance that sets up before microphone output interface; therefore, the utility model discloses a microphone input circuit, the interference killing feature is strong, has guaranteed the normal use of microphone, has strengthened user experience greatly.
Drawings
The invention is further described with reference to the following figures and examples.
Fig. 1 is a circuit diagram of a microphone input circuit related to a microphone signal input module according to an embodiment of the present invention;
fig. 2 is a circuit diagram of a microphone input circuit according to an embodiment of the present invention, the circuit diagram being related to a left channel output module of a microphone signal output module;
fig. 3 is a circuit diagram of a microphone input circuit related to a right channel output module in a microphone signal output module according to an embodiment of the present invention.
Detailed Description
This section will describe in detail the embodiments of the present invention, preferred embodiments of the present invention are shown in the attached drawings, which are used to supplement the description of the text part of the specification with figures, so that one can intuitively and vividly understand each technical feature and the whole technical solution of the present invention, but they cannot be understood as the limitation of the protection scope of the present invention.
In the description of the present invention, it should be understood that the orientation or positional relationship indicated with respect to the orientation description, such as up, down, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the description of the present invention, a plurality of means are one or more, a plurality of means are two or more, and the terms greater than, less than, exceeding, etc. are understood as not including the number, and the terms greater than, less than, within, etc. are understood as including the number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the present invention, unless there is an explicit limitation, the words such as setting, installation, connection, etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above words in combination with the specific contents of the technical solution.
Referring to fig. 1 to 3, an embodiment of the present invention provides a microphone input circuit, which includes a DSP module, more than one microphone signal input module and a microphone signal output module, where one microphone signal input module corresponds to one microphone signal output module, and the microphone signal input module is connected to the microphone signal output module through the DSP module; the microphone signal input module comprises a microphone input interface 110, a microphone output interface 180, a magnetic bead circuit unit 120 for preventing electromagnetic interference, a blocking circuit unit 130 for blocking direct current, a power supply switch circuit unit 150 for supplying power, a power supply switch control circuit unit 140 for controlling power supply, a pull-down resistor circuit unit 160 for preventing impact noise during power-on, and a differential output circuit unit 170 for reducing external interference, wherein the microphone input interface 110 is connected to the DSP module sequentially through the magnetic bead circuit unit 120, the blocking circuit unit 130, the differential output circuit unit 170 and the microphone output interface 180, the power supply switch control circuit unit 140 is connected to the power supply switch circuit unit 150, the power supply switch circuit unit 150 is further connected between the magnetic bead circuit unit 120 and the blocking circuit unit 130, one end of the pull-down resistor circuit unit 160 is connected to the power supply switch circuit unit 150, the other end is connected between the blocking circuit unit 130 and the differential output circuit unit 170; the magnetic bead circuit unit 120 is provided with magnetic beads for preventing electromagnetic interference, such as L1000 and L1001 in the figure, and the pull-down resistor circuit unit 160 is provided with pull-down resistors for preventing impact noise when being powered on, such as R1024 and R1025 in the figure.
In this embodiment, there are three anti-interference structures, the first place is to set a magnetic bead for preventing electromagnetic interference in the magnetic bead circuit unit 120, the second place is to set a pull-down resistor for preventing impact noise during power-on in the pull-down resistor circuit unit 160, and the third place is to set a differential output circuit unit 170 before the microphone output interface 180 for reducing external interference in signal output; therefore, the microphone input circuit of the embodiment has strong anti-interference capability, ensures the normal use of the microphone, and greatly enhances the user experience.
The magnetic beads are specially used for inhibiting high-frequency noise and spike interference on a signal line and a power line and have the capacity of absorbing electrostatic pulses. The magnetic beads are used for absorbing ultrahigh frequency signals, like some RF circuits, PLL, oscillating circuits and circuits containing ultrahigh frequency memories (DDRSDRAM, RAMBUS and the like), the magnetic beads are required to be added to a power supply input part, the inductor is an energy storage element and is used in LC oscillating circuits, medium and low frequency filter circuits and the like, and the application frequency range of the inductor rarely exceeds 50 MHZ. The magnetic beads have very high resistivity and permeability, which are equivalent to a resistor and an inductor connected in series, but the resistance value and the inductance value change along with the frequency. Therefore, in the embodiment, the magnetic bead is disposed in the magnetic bead circuit unit 120, so that electromagnetic interference can be effectively prevented.
The pull-down resistor has the functions of improving the voltage level, preventing static electricity and interference, suppressing reflected wave interference, improving the noise tolerance of the chip input signal, and the like, so that the pull-down resistor is arranged in the pull-down resistor circuit unit 160 in the embodiment, and the occurrence of impact noise during power-on can be well prevented.
Based on the above embodiment, another embodiment of the present invention provides a microphone input circuit, wherein a dc blocking capacitor for blocking dc is disposed in the blocking circuit unit 130, such as C1001 and C1002 in the figure. The blocking capacitor in this embodiment can prevent the dc from entering the next stage circuit unit.
Based on the above embodiment, another embodiment of the present invention provides a microphone input circuit, wherein an RC filter combination for preventing impact sound during power on/off is disposed in the power supply switch control circuit unit 140, as shown in R1016 and C1012. In this embodiment, the power supply switch control circuit unit 140 can perform a filtering function by using an RC filtering combination, so as to prevent an impact sound during the power on/off operation.
Based on the above embodiment, another embodiment of the present invention provides a microphone input circuit, in which a PNP tube (such as Q1000 in the figure) for functioning as a power supply switch and a current limiting resistor (such as R1000 in the figure) for preventing the PNP tube from being damaged are disposed in the power supply switch circuit unit 150. In the embodiment, the PNP tube is adopted, the response speed is high, and the current-limiting resistor is adopted, so that the PNP tube can play a role in limiting current when being continuously switched on and off, and the PNP tube cannot be damaged.
Based on the above embodiment, another embodiment of the present invention provides a microphone input circuit, wherein the microphone signal output module includes a left channel output module and a right channel output module; the left channel output module comprises a left channel input interface 211, a left channel audio amplification unit 212 and a left channel output interface 213, and the DSP module is connected to the left channel output interface 213 through the left channel input interface 211 and the left channel audio amplification unit 212 in sequence; the right channel output module includes a right channel input interface 221, a right channel audio amplification unit 222 and a right channel output interface 223, and the DSP module is connected to the right channel output interface 223 sequentially through the right channel input interface 221 and the right channel audio amplification unit 222. In this embodiment, for the left channel, the signal output by the DSP module enters the left channel audio amplifying unit 212 through the left channel input interface 211, increases the gain, reduces the signal-to-noise ratio, and is finally output from the left channel output interface 213; similarly, for the right channel, the signal output by the DSP module enters the right channel audio amplifying unit 222 through the right channel input interface 221, so as to increase the gain and reduce the signal-to-noise ratio, and finally is output from the right channel output interface 223.
Based on the above embodiment, another embodiment of the present invention provides a microphone input circuit, which includes a DSP module, more than one microphone signal input module and a microphone signal output module, where one microphone signal input module corresponds to one microphone signal output module, and the microphone signal input module is connected to the microphone signal output module through the DSP module; the microphone signal input module comprises a microphone input interface 110, a microphone output interface 180, a magnetic bead circuit unit 120 for preventing electromagnetic interference, a blocking circuit unit 130 for blocking direct current, a power supply switch circuit unit 150 for supplying power, a power supply switch control circuit unit 140 for controlling power supply, a pull-down resistor circuit unit 160 for preventing impact noise during power-on, and a differential output circuit unit 170 for reducing external interference, wherein the microphone input interface 110 is connected to the DSP module sequentially through the magnetic bead circuit unit 120, the blocking circuit unit 130, the differential output circuit unit 170 and the microphone output interface 180, the power supply switch control circuit unit 140 is connected to the power supply switch circuit unit 150, the power supply switch circuit unit 150 is further connected between the magnetic bead circuit unit 120 and the blocking circuit unit 130, one end of the pull-down resistor circuit unit 160 is connected to the power supply switch circuit unit 150, the other end is connected between the blocking circuit unit 130 and the differential output circuit unit 170; magnetic beads for preventing electromagnetic interference are arranged in the magnetic bead circuit unit 120, and a pull-down resistor for preventing impact noise during power-on is arranged in the pull-down resistor circuit unit 160; secondly, a dc blocking capacitor for blocking the dc is arranged in the blocking circuit unit 130; secondly, an RC filtering combination for preventing impact sound during on/off is arranged in the power supply switch control circuit unit 140; secondly, a PNP tube for functioning as a power supply switch and a current limiting resistor for preventing the PNP tube from being damaged are arranged in the power supply switch circuit unit 150; secondly, the microphone signal output module comprises a left sound channel output module and a right sound channel output module; the left channel output module comprises a left channel input interface 211, a left channel audio amplification unit 212 and a left channel output interface 213, and the DSP module is connected to the left channel output interface 213 through the left channel input interface 211 and the left channel audio amplification unit 212 in sequence; the right channel output module includes a right channel input interface 221, a right channel audio amplification unit 222 and a right channel output interface 223, and the DSP module is connected to the right channel output interface 223 sequentially through the right channel input interface 221 and the right channel audio amplification unit 222.
In this embodiment, there are three anti-interference structures, the first place is to set a magnetic bead for preventing electromagnetic interference in the magnetic bead circuit unit 120, the second place is to set a pull-down resistor for preventing impact noise during power-on in the pull-down resistor circuit unit 160, and the third place is to set a differential output circuit unit 170 before the microphone output interface 180 for reducing external interference in signal output; therefore, the microphone input circuit of the embodiment has strong anti-interference capability, ensures the normal use of the microphone, and greatly enhances the user experience.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art.
Claims (5)
1. A microphone input circuit, characterized by: the microphone signal input module corresponds to one microphone signal output module, and the microphone signal input module is connected to the microphone signal output module through the DSP module; the microphone signal input module comprises a microphone input interface, a microphone output interface, a magnetic bead circuit unit for preventing electromagnetic interference, a cut-off circuit unit for cutting off direct current, a power supply switch circuit unit for supplying power, a power supply switch control circuit unit for controlling power supply, a pull-down resistance circuit unit for preventing impact noise during power-on and a differential output circuit unit for reducing external interference, wherein the microphone input interface sequentially passes through the magnetic bead circuit unit, the cut-off circuit unit, the differential output circuit unit and the microphone output interface are connected to the DSP module, the power supply switch control circuit unit is connected to the power supply switch circuit unit, the power supply switch circuit unit is further connected to the magnetic bead circuit unit and between the cut-off circuit units, one end of the pull-down resistance circuit unit is connected to the power supply switch circuit unit, the other end of the differential output circuit unit is connected between the isolating circuit unit and the differential output circuit unit; the magnetic bead circuit unit is internally provided with a magnetic bead for preventing electromagnetic interference, and the pull-down resistor circuit unit is internally provided with a pull-down resistor for preventing impact noise during electrification.
2. A microphone input circuit according to claim 1, characterized in that: and a direct current blocking capacitor for blocking direct current is arranged in the blocking circuit unit.
3. A microphone input circuit according to claim 1, characterized in that: and an RC filtering combination for preventing impact sound during startup and shutdown is arranged in the power supply switch control circuit unit.
4. A microphone input circuit according to claim 1, characterized in that: and a PNP tube for playing a role of a power supply switch and a current limiting resistor for preventing the PNP tube from being damaged are arranged in the power supply switch circuit unit.
5. A microphone input circuit according to claim 1, characterized in that: the microphone signal output module comprises a left sound channel output module and a right sound channel output module; the left sound channel output module comprises a left sound channel input interface, a left sound channel audio amplification unit and a left sound channel output interface, and the DSP module is connected to the left sound channel output interface sequentially through the left sound channel input interface and the left sound channel audio amplification unit; the right channel output module comprises a right channel input interface, a right channel audio amplification unit and a right channel output interface, and the DSP module is connected to the right channel output interface sequentially through the right channel input interface and the right channel audio amplification unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921467910.5U CN210225729U (en) | 2019-09-03 | 2019-09-03 | Microphone input circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921467910.5U CN210225729U (en) | 2019-09-03 | 2019-09-03 | Microphone input circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210225729U true CN210225729U (en) | 2020-03-31 |
Family
ID=69920232
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921467910.5U Active CN210225729U (en) | 2019-09-03 | 2019-09-03 | Microphone input circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210225729U (en) |
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2019
- 2019-09-03 CN CN201921467910.5U patent/CN210225729U/en active Active
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