CN115190388A - Earphone interface circuit and electronic equipment - Google Patents
Earphone interface circuit and electronic equipment Download PDFInfo
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- CN115190388A CN115190388A CN202210670588.6A CN202210670588A CN115190388A CN 115190388 A CN115190388 A CN 115190388A CN 202210670588 A CN202210670588 A CN 202210670588A CN 115190388 A CN115190388 A CN 115190388A
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- 101001071145 Homo sapiens Polyhomeotic-like protein 1 Proteins 0.000 description 3
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- 101100043388 Arabidopsis thaliana SRK2D gene Proteins 0.000 description 1
- 101100489713 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) GND1 gene Proteins 0.000 description 1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/10—Earpieces; Attachments therefor ; Earphones; Monophonic headphones
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
- G10L19/00—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis
- G10L19/012—Comfort noise or silence coding
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R3/00—Circuits for transducers, loudspeakers or microphones
- H04R3/04—Circuits for transducers, loudspeakers or microphones for correcting frequency response
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2201/00—Details of transducers, loudspeakers or microphones covered by H04R1/00 but not provided for in any of its subgroups
- H04R2201/003—Mems transducers or their use
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Abstract
The application discloses earphone interface circuit and electronic equipment belongs to electron technical field. The specific scheme comprises the following steps: the microphone, the filtering module and the loudspeaker; the microphone comprises an output port, a power port and a first ground port; the filtering module comprises a first port, a second port and a third port; the horn comprises an input port and a second ground port; the output port is connected with a microphone pin of an earphone, the power supply port is connected with the first port, the second port is connected with the input port, the third port is connected with a target sound channel pin of the earphone, and the first grounding port and the second grounding port are connected with a grounding pin of the earphone; the filtering module is used for filtering alternating current signals transmitted to the power supply port from the target sound channel pin and filtering direct current signals transmitted to the input port from the target sound channel pin.
Description
Technical Field
The application belongs to the technical field of electronics, concretely relates to earphone interface circuit and electronic equipment.
Background
With the development of electronic technology, people have higher and higher requirements on the performance of earphones.
In the related art, an earphone with a 3.5mm interface is generally used for an electronic device, and since the earphone includes 4 signal lines, a microphone on the earphone needs to use a circuit design of multiplexing a power supply and an output, multiplexing a microphone ground line and a left and right sound channel voice coil ground lines, and a bias voltage signal of a Micro-Electro-Mechanical System (MEMS) microphone is collected as a power supply input through a bias resistor at a power supply end.
However, since the output signal of this circuit design does not pass through the internal circuit of the MEMS microphone, the Power Supply Rejection Ratio (PSRR) cannot function, which results in poor anti-interference performance and increased noise of the earphone, and cannot meet the user requirement for a high-performance MEMS microphone.
Disclosure of Invention
The embodiment of the application aims to provide an earphone interface circuit and electronic equipment, which can solve the problems of poor anti-interference performance and high noise of an earphone microphone.
In a first aspect, an embodiment of the present application provides an earphone interface circuit, including: the microphone, the filtering module and the loudspeaker; the microphone comprises an output port, a power port and a first ground port; the filtering module comprises a first port, a second port and a third port; the horn comprises an input port and a second ground port; the output port is connected with a microphone pin of an earphone, the power supply port is connected with the first port, the second port is connected with the input port, the third port is connected with a target sound channel pin of the earphone, and the first grounding port and the second grounding port are connected with a grounding pin of the earphone; the filtering module is used for filtering alternating current signals transmitted to the power supply port from the target sound channel pin and filtering direct current signals transmitted to the input port from the target sound channel pin.
In a second aspect, an embodiment of the present application provides an earphone interface circuit, including: an audio encoder and a bias power supply; the audio encoder includes a microphone input port and a channel output port; under the condition that the earphone and the electronic equipment are in a connected state, the microphone input port is connected with a microphone pin of the earphone, and the sound channel output port is connected with a target sound channel pin of the earphone; the bias power supply is connected to a sound channel output line between the sound channel output port and the target sound channel pin.
In a third aspect, an embodiment of the present application provides an electronic device including the earphone interface circuit according to the second aspect.
In the embodiment of the application, the earphone interface circuit comprises a microphone, a filtering module and a loudspeaker; the microphone comprises an output port, a power port and a first ground port; the filtering module comprises a first port, a second port and a third port; the horn comprises an input port and a second ground port; the output port is connected with a microphone pin of an earphone, the power supply port is connected with the first port, the second port is connected with the input port, the third port is connected with a target sound channel pin of the earphone, and the first grounding port and the second grounding port are connected with a grounding pin of the earphone; the filtering module is used for filtering alternating current signals transmitted to the power supply port from the target sound channel pin and filtering direct current signals transmitted to the input port from the target sound channel pin. According to the scheme, on one hand, the filtering module can filter alternating current signals transmitted to the power supply port from the target sound channel pin and filter direct current signals transmitted to the input port from the target sound channel pin, so that power supply and signal transmission can be realized under the condition that the normal function of the earphone is not influenced; on the other hand, the output port can be directly connected with the microphone pin of the earphone, so that the earphone adopting the high-performance MEMS microphone can realize the advantages of high interference resistance and high signal-to-noise ratio, and the use requirement of a user on the high-performance MEMS microphone can be met.
Drawings
Fig. 1 is a schematic diagram of a headphone interface circuit provided in the related art;
fig. 2 is a schematic diagram of a headphone interface circuit at a headphone end provided by an embodiment of the present application;
fig. 3 is a schematic diagram of a headset interface circuit at an electronic device end according to an embodiment of the present disclosure;
fig. 4 is a schematic diagram of a headset interface circuit when a headset is connected to an electronic device according to an embodiment of the present application;
FIG. 5 is a comparison diagram of the low pass filter module provided by the embodiment of the present application before and after processing;
fig. 6 is a comparison diagram before and after processing of the high-pass filtering module provided in the embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be described clearly below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some, but not all, embodiments of the present application. All other embodiments that can be derived by one of ordinary skill in the art from the embodiments given herein are intended to be within the scope of the present disclosure.
The terms first, second and the like in the description and in the claims of the present application are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It will be appreciated that the data so used may be interchanged under appropriate circumstances such that embodiments of the application may be practiced in sequences other than those illustrated or described herein, and that the terms "first," "second," and the like are generally used herein in a generic sense and do not limit the number of terms, e.g., the first term can be one or more than one. In addition, "and/or" in the specification and claims means at least one of connected objects, a character "/" generally means that a preceding and succeeding related objects are in an "or" relationship.
The following describes in detail the earphone interface circuit provided in the embodiments of the present application with reference to the accompanying drawings.
As shown in fig. 1, the earphone interface circuit is a related art earphone and electronic device when they are connected via a connection port 300. The earphone end 100 of the earphone interface circuit includes a microphone 110, the microphone 110 includes an output port OUT, a power port VDD, and a first ground port GND, and the electronic device end 200 includes an audio encoder 210, the audio encoder 210 includes a microphone input port MIC-P, a left channel output port HPH-L, and a right channel output port HPH-R. The power supply port VDD is connected with the microphone input port MIC-P, the output port OUT is grounded with the first ground port GND, the BIAS power supply MIC-BIAS is connected to a signal line between the power supply port VDD and the microphone input port MIC-P, the right sound channel output port HPH-L is connected with the right loudspeaker SPK1, and the left sound channel output port HPH-L is connected with the left loudspeaker SPK2.
Since the above-mentioned earphone interface circuit collects the BIAS voltage signal of the microphone 110 as input through the BIAS resistor R11 at the MIC-BIAS end of the BIAS power supply, the sensitivity of the microphone is reduced, the distortion is poor, and the dynamic range is poor, and since the output signal of the electronic device end 200 does not pass through the internal circuit of the microphone 110, the PSRR cannot function, the anti-interference performance of the earphone is poor, the noise is increased, and the high performance advantage of the MEMS microphone cannot be realized.
In order to solve the above problem, as shown in fig. 2, an embodiment of the present application provides an earphone interface circuit, including: a microphone 110, a filtering module 120, and a speaker 130. The microphone 110 includes an output port OUT, a power port VDD, and a first ground port GND. The filtering module 120 includes a first port 121, a second port 122, and a third port 123; the horn 130 includes an input port 131 and a second ground port 132. The output port OUT is connected to a microphone pin MIC of the earphone, the power port VDD is connected to the first port 121, the second port 122 is connected to the input port 131, the third port 123 is connected to a target channel pin HPH of the earphone, and the first ground port GND and the second ground port 132 are connected to a ground pin GND1 of the earphone. The filtering module 120 may be configured to filter an ac signal transmitted from the target channel pin HPH to the power port VDD, and filter a dc signal transmitted from the target channel pin HPH to the input port 131.
It should be noted that, since the output port OUT can be directly connected to the microphone pin MIC of the earphone, the PSRR of the microphone 110 can be ensured to function normally, and the noise from the power supply VDD can be suppressed after passing through the microphone 110.
Optionally, the filtering module 120 may include a low-pass filtering module and a high-pass filtering module; the low pass filter module is connected between the target audio channel pin HPH and the power port VDD, and the high pass filter module is connected between the target audio channel pin HPH and the input port 131. The low-pass filtering module can be used for filtering an alternating current signal transmitted from the target sound channel pin HPH to the power supply port VDD; the high pass filter module may be configured to filter out a dc signal transmitted from the target channel pin HPH to the input port 131.
Optionally, the target channel pin HPH may be any one of a left channel pin HPH-L and a right channel pin HPH-R of the headphone; in the case that the target channel pin HPH is the left channel pin HPH-L, the speaker 130 may be a left speaker of an earphone; in the case where the target channel pin HPH is the right channel pin HPH-R, the speaker 130 may be a right speaker of the earphone. That is, only one speaker needs to be selected to be connected to the filtering module 120 in the above-mentioned earphone interface circuit, and the other speaker can be directly connected to the corresponding sound channel pin according to the normal connection mode.
As shown in fig. 3, an embodiment of the present application further provides an earphone interface circuit, including: an audio encoder 210 and a bias power module 220. The audio encoder 210 includes a microphone input port MIC1 and a channel output port HPH1, and the BIAS power supply module 220 includes a BIAS power supply MIC-BIAS. Under the condition that the earphone and the electronic equipment are in a connected state, the microphone input port MIC1 is connected with a microphone pin MIC of the earphone, and the sound channel output port HPH1 is connected with a target sound channel pin HPH of the earphone; the bias power supply module 220 is connected to the channel output line between the channel output port HPH1 and the target channel pin HPH.
Optionally, with continued reference to fig. 3, the BIAS power module 220 may further include a BIAS resistor R11, where one end of the BIAS resistor R11 is connected to the BIAS power MIC _ BIAS, and the other end is connected to the channel output line. The bias resistor R11 can be used for reducing the current on the power transmission line, and plays a role in protecting the circuit.
The following describes in detail the earphone interface circuit when the earphone and the electronic device are in a connected state, taking the target channel pin HPH as the right channel pin HPH-R as an example.
As shown in fig. 4, the low pass filtering module may include a first resistor R12 and a first capacitor C1. One end of the first resistor R12 is connected with a right sound channel pin HPH-R, the other end of the first resistor R12 is connected with the power supply port VDD, one end of the first capacitor C1 is connected between the first resistor R12 and the power supply port VDD, and the other end of the first capacitor C1 is grounded. The direct current voltage of the BIAS power supply MIC _ BIAS can be loaded onto the right channel pin HPH-R through the BIAS resistor R11, when the electronic equipment plays audio through the earphone, the right channel output port HPH-R of the audio encoder can output audio alternating current signals, and the power supply port VDD of the microphone only needs the direct current component generated by the BIAS power supply MIC _ BIAS as working voltage and does not need the alternating current component output by the audio encoder, so that the audio alternating current signals can be filtered through the low-pass filtering module, and only the direct current voltage of the BIAS power supply MIC _ BIAS is reserved.
As shown in fig. 5, the signal at the right channel pin HPH-R includes both the audio ac signal and the dc signal of the BIAS supply MIC _ BIAS before being processed by the low pass filtering module. When the audio alternating current signal carrying the BIAS power supply MIC _ BIAS direct current component is filtered by the low-pass filtering module, the audio alternating current signal is filtered, and the signal transmitted to the power supply port VDD only comprises the BIAS power supply MIC _ BIAS direct current component.
Optionally, the cut-off frequency of the low-pass filtering module is 20Hz. The low pass filtering module can allow low frequency signals to pass and prevent signals with frequencies higher than the cut-off frequency from passing. Since the audio frequency range that can be heard by human ears is 20Hz-20kHz, the cut-off frequency can be set to 20Hz in order to filter out the audio ac signal output by the output port HPH-R.
Alternatively, according to a formula of calculation of the cut-off frequency
It can be seen that the values of the first resistor R31 and the first capacitor C1 can be any combination that can make the cutoff frequency f equal to 20Hz.
With continued reference to fig. 4, the high pass filtering module may include a second resistor R13 and a second capacitor C2; one end of the second capacitor C2 is connected to the right channel pin HPH-R, the other end is connected to the input end 231, one end of the second resistor R13 is connected to the second capacitor C2, and the other end is grounded. The direct current voltage of the BIAS power supply MIC _ BIAS can be loaded on the right channel pin HPH-R through the BIAS resistor R11, when the electronic equipment plays audio through an earphone, the right channel output port HPH-R of the audio encoder can output audio alternating current signals, and as the right loudspeaker SPK1 only needs the audio alternating current signals output by the right channel output port HPH-R and does not need direct current components generated by the BIAS power supply MIC _ BIAS, the direct current components generated by the BIAS power supply MIC _ BIAS can be filtered through the high-pass filtering module, and only the audio alternating current signals output by the right channel output port HPH-R are reserved.
As shown in fig. 6, the signal at the right channel pin HPH-R includes both the audio ac signal and the dc signal of the BIAS supply MIC _ BIAS before being processed by the high pass filtering module. When the audio alternating current signal carrying the BIAS power supply MIC _ BIAS direct current component is filtered by the high-pass filtering module, the direct current signal of the BIAS power supply MIC _ BIAS is filtered, and the signal transmitted to the right loudspeaker SPK1 only comprises the audio alternating current signal output by the right sound channel output port HPH-R.
Alternatively, with continued reference to fig. 4, the second resistor R13 may be the right horn SPK1. That is, the impedance of the right horn SPK1 itself and the second capacitor C2 may form a high pass filter.
Optionally, the cut-off frequency of the high-pass filtering module may be less than or equal to 20Hz. The high-pass filtering module can allow high-frequency signals to pass and prevent signals with frequencies lower than a cut-off frequency from passing. Since the audio frequency range that can be heard by the human ear is 20Hz to 20kHz, the cutoff frequency may be set to any value less than or equal to 20Hz in order to preserve the audio ac signal output by the output port HPH-R.
Alternatively, in the case that the second resistor R13 is the right horn SPK1, since the impedance of the right horn SPK1 is a fixed value, the capacitance value of the second capacitor C2 may be any value that can make the cutoff frequency of the high-pass filter module less than or equal to 20Hz.
For example, if the impedance of the right speaker SPK1 is 32 Ω, when the second capacitance C2 is 300uF, the calculation formula of the cut-off frequency is based on
The cutoff frequency f is known to be 16Hz. Since the cut-off frequency f is less than 20Hz, the second capacitance C2 may be 300uF.
In the embodiment of the present application, on one hand, the filtering module may filter the ac signal transmitted from the target sound channel pin to the power port and filter the dc signal transmitted from the target sound channel pin to the input port, so that the transmission of the power and the signal may be realized without affecting the normal function of the earphone; on the other hand, the output port can be directly connected with the microphone pin of the earphone, so that the earphone adopting the high-performance MEMS microphone can realize the advantages of high interference resistance and high signal-to-noise ratio, and the use requirement of a user on the high-performance MEMS microphone can be met.
The embodiment of the present application further provides an electronic device, where the electronic device may include the above-mentioned earphone interface circuit, and the electronic device may achieve the same technical effect as the above-mentioned earphone interface circuit, and for avoiding repetition, details are not repeated here.
The electronic device in the embodiment of the present application may be a terminal, or may be other devices besides the terminal. The electronic Device may be, for example, a Mobile phone, a tablet computer, a notebook computer, a palm computer, a vehicle-mounted electronic Device, a Mobile Internet Device (MID), an Augmented Reality (AR)/Virtual Reality (VR) Device, a robot, a wearable Device, an ultra-Mobile personal computer (UMPC), a netbook or a Personal Digital Assistant (PDA), and the like, and may also be a server, a Network Attached Storage (Network Attached Storage, NAS), a personal computer (NAS), a Television (TV), an assistant, a teller machine, a self-service machine, and the like, and the embodiments of the present application are not limited in particular.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising a … …" does not exclude the presence of another identical element in a process, method, article, or apparatus that comprises the element. Further, it should be noted that the scope of the methods and apparatus of the embodiments of the present application is not limited to performing the functions in the order illustrated or discussed, but may include performing the functions in a substantially simultaneous manner or in a reverse order based on the functions involved, e.g., the methods described may be performed in an order different than that described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.
Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solutions of the present application may be embodied in the form of a computer software product, which is stored in a storage medium (e.g., ROM/RAM, magnetic disk, optical disk) and includes instructions for enabling a terminal (e.g., a mobile phone, a computer, a server, or a network device) to execute the method according to the embodiments of the present application.
While the present embodiments have been described with reference to the accompanying drawings, it is to be understood that the invention is not limited to the precise embodiments described above, which are meant to be illustrative and not restrictive, and that various changes may be made therein by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (12)
1. An earphone interface circuit, comprising: the microphone, the filtering module and the loudspeaker; the microphone comprises an output port, a power port and a first ground port; the filtering module comprises a first port, a second port and a third port; the horn comprises an input port and a second ground port;
the output port is connected with a microphone pin of an earphone, the power supply port is connected with the first port, the second port is connected with the input port, the third port is connected with a target sound channel pin of the earphone, and the first grounding port and the second grounding port are connected with a grounding pin of the earphone;
the filtering module is used for filtering alternating current signals transmitted to the power supply port from the target sound channel pin and filtering direct current signals transmitted to the input port from the target sound channel pin.
2. The headphone interface circuit according to claim 1, wherein the filtering module comprises a low-pass filtering module and a high-pass filtering module; the low-pass filtering module is connected between the target sound channel pin and the power supply port, and the high-pass filtering module is connected between the target sound channel pin and the input port.
3. The headphone interface circuit according to claim 2, wherein the low pass filtering module comprises a first resistor and a first capacitor; one end of the first resistor is connected with the target sound channel pin, the other end of the first resistor is connected with the power port, one end of the first capacitor is connected between the first resistor and the power port, and the other end of the first capacitor is grounded.
4. The headphone interface circuit according to claim 3, wherein the low pass filtering module has a cutoff frequency of 20Hz.
5. The headphone interface circuit according to claim 2, wherein the high-pass filtering module comprises a second resistor and a second capacitor; one end of the second capacitor is connected with the target sound channel pin, the other end of the second capacitor is connected with the input end, one end of the second resistor is connected with the second capacitor, and the other end of the second resistor is grounded.
6. The headset interface circuit of claim 5, wherein the second resistance is the speaker.
7. The headphone interface circuit according to claim 5, wherein a cutoff frequency of the high pass filtering module is less than or equal to 20Hz.
8. The headphone interface circuit according to any one of claims 1-7, wherein the target channel pin is any one of a left channel pin and a right channel pin of the headphone;
under the condition that the target sound channel pin is the left sound channel pin, the loudspeaker is a left loudspeaker of the earphone;
and under the condition that the target sound channel pin is the right sound channel pin, the loudspeaker is a right loudspeaker of the earphone.
9. An earphone interface circuit, comprising: an audio encoder and a bias power supply module; the audio encoder comprises a microphone input port and a sound channel output port, and the bias power supply module comprises a bias power supply;
under the condition that the earphone and the electronic equipment are in a connected state, the microphone input port is connected with a microphone pin of the earphone, and the sound channel output port is connected with a target sound channel pin of the earphone;
the bias power supply is connected to a sound channel output line between the sound channel output port and the target sound channel pin.
10. The headphone interface circuit according to claim 9, wherein the target channel pin is any one of a left channel pin and a right channel pin of the headphone.
11. The headphone interface circuit according to claim 9, wherein the bias power supply module further comprises a bias resistor, one end of the bias resistor is connected to the bias power supply, and the other end of the bias resistor is connected to the audio channel output line.
12. An electronic device, comprising the headset interface circuit of any of claims 9-11.
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| CN202210670588.6A CN115190388A (en) | 2022-06-14 | 2022-06-14 | Earphone interface circuit and electronic equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116709113A (en) * | 2022-12-21 | 2023-09-05 | 荣耀终端有限公司 | Audio circuit, control method thereof, electronic equipment and audio system |
| CN116709113B (en) * | 2022-12-21 | 2024-05-24 | 荣耀终端有限公司 | Audio circuit, control method thereof, electronic equipment and audio system |
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