CN219876065U - Microphone switching circuit and earphone - Google Patents
Microphone switching circuit and earphone Download PDFInfo
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- CN219876065U CN219876065U CN202320743312.6U CN202320743312U CN219876065U CN 219876065 U CN219876065 U CN 219876065U CN 202320743312 U CN202320743312 U CN 202320743312U CN 219876065 U CN219876065 U CN 219876065U
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- 239000003990 capacitor Substances 0.000 claims description 11
- 230000003321 amplification Effects 0.000 claims description 8
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 8
- 239000011324 bead Substances 0.000 claims description 7
- 238000004891 communication Methods 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 4
- 238000001914 filtration Methods 0.000 description 3
- 230000005236 sound signal Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 230000008054 signal transmission Effects 0.000 description 2
- 239000002131 composite material Substances 0.000 description 1
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Abstract
The utility model discloses a microphone switching circuit and an earphone, which can be connected with terminal equipment through a wired earphone access module, so that a feedback signal can be output to a Bluetooth chip when the terminal equipment is connected, the Bluetooth chip can adjust the output of a switching control end according to the feedback signal, so that a second power supply end is connected with a microphone connecting end, and the terminal equipment can supply power to a microphone. In addition, when the wired earphone access module is not connected with the terminal equipment, the Bluetooth chip can not receive the feedback signal, so that the power supply of the Bluetooth chip can be switched to ensure the normal use of the microphone. The microphone switching circuit provided by the utility model utilizes the wired earphone access module as feedback and combines the switching function of the selection circuit, so that the automatic switching of the Bluetooth mode and the wired mode is realized, and the use experience of a user is greatly improved. In addition, the utility model multiplexes the microphone circuit, and can save cost and structural design space.
Description
Technical Field
The present utility model relates to the field of headphones, and in particular, to a microphone switching circuit and a headphone.
Background
Headphones are a common electronic product and are widely used in daily life of people. With the progress of science and technology and economy, bluetooth headset is a current application trend, and among them, the headset is a priority choice for a part of serious users because of the comfort to ears when playing. However, with further development of bluetooth headset, in order to meet more complex use demands, a headset having two working modes of a wired mode and a wireless mode is currently available on the market, but when in use, if the two modes need to be manually switched by a user, the manual switching is easy to be bothered when the user forgets to switch, for example, the headset needs to be re-taken off for switching operation, and the use experience of the user is seriously affected.
Disclosure of Invention
The present utility model aims to solve at least one of the technical problems existing in the prior art. Therefore, the utility model provides a microphone switching circuit which can automatically realize the automatic switching of a wired mode and a wireless mode of a headset.
The utility model further provides the earphone.
According to an embodiment of the first aspect of the present utility model, a microphone switching circuit includes:
the selection circuit is provided with a microphone connecting end, a first power supply end, a second power supply end and a selection switching end, wherein the microphone connecting end is used for connecting a microphone;
the Bluetooth chip is provided with a first audio output end, a wired feedback input end, a switching control end and a first voltage end, wherein the first voltage end is connected with the first power supply end, the switching control end is connected with the selection switching end, and the first audio output end is used for being connected with an audio playing unit; the Bluetooth chip is used for adjusting the communication state among the first power supply end, the second power supply end and the microphone connecting end;
the wired earphone access module is provided with a wired access signal feedback end, a second voltage end and a second audio output end, wherein the wired access signal feedback end is connected with the wired feedback input end, the second voltage end is connected with the second power supply end, and the second audio output end is connected with the audio playing unit; the wired earphone access module is used for connecting terminal equipment and adjusting working states of the wired access signal feedback end, the second voltage end and the second audio output end according to the connection state with the terminal equipment.
The microphone switching circuit provided by the embodiment of the utility model has at least the following beneficial effects:
the connection with the terminal equipment can be completed through the wired earphone access module, so that a feedback signal is output to the Bluetooth chip when the terminal equipment can be connected, the Bluetooth chip can adjust the output of the switching control end according to the feedback signal, the second power supply end is connected with the microphone connection end, and the power supply of the microphone by the terminal equipment is realized. In addition, when the wired earphone access module is not connected with the terminal equipment, the Bluetooth chip can not receive the feedback signal, so that the power supply of the Bluetooth chip can be switched to ensure the normal use of the microphone. The microphone switching circuit provided by the embodiment of the utility model utilizes the wired earphone access module as feedback and combines the switching function of the selection circuit, so that the automatic switching of the Bluetooth mode and the wired mode is realized, and the use experience of a user is greatly improved. In addition, the utility model multiplexes the microphone circuit, and can save cost and structural design space.
According to some embodiments of the utility model, the selection circuit comprises:
the drain electrode of the first switch tube is connected with the first voltage end, the source electrode of the first switch tube is connected with the microphone, and a first resistor is connected between the source electrode and the grid electrode;
the grid electrode of the second switching tube is connected with the switching control end, the drain electrode of the second switching tube is connected with the grid electrode of the first switching tube, the source electrode of the second switching tube is connected with the ground wire, and a second resistor is connected between the source electrode and the grid electrode;
the drain electrode of the third switching tube is connected with the second voltage end, and the grid electrode of the third switching tube is connected with the grid electrode of the second switching tube;
and the source electrode of the fourth switching tube is connected with the source electrode of the third switching tube, the grid electrode of the fourth switching tube is connected with the grid electrode of the third switching tube, and the drain electrode of the fourth switching tube is connected with the source electrode of the first switching tube.
According to some embodiments of the utility model, a first capacitor is connected between the drain of the first switch tube and the ground.
According to some embodiments of the utility model, a second capacitor is connected between the drain of the fourth switching tube and the ground.
According to some embodiments of the utility model, a magnetic bead is connected between the drain electrode of the fourth switch tube and the microphone.
According to some embodiments of the utility model, the audio playing unit comprises:
the input end of the power amplification unit is connected with the first audio output end;
and the loudspeaker is respectively connected with the output end of the power amplification unit and the second audio output end.
According to some embodiments of the utility model, the first switching tube, the second switching tube, the third switching tube and the fourth switching tube are all MOS tubes.
According to some embodiments of the utility model, the wired earphone access module employs an AUX connection.
According to some embodiments of the utility model, a third capacitor is connected between the wired access signal feedback end and the ground line.
According to some embodiments of the utility model, a magnetic bead is connected between the second voltage terminal and the second power supply terminal.
An earphone according to an embodiment of the second aspect of the present utility model comprises a microphone switching circuit as described in the embodiment of the first aspect. The earphone according to the embodiment of the utility model comprises the microphone switching circuit according to the embodiment of the first aspect, and therefore has all the advantages of the microphone switching circuit according to the embodiment of the first aspect.
Additional aspects and advantages of the utility model will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model.
Drawings
The foregoing and/or additional aspects and advantages of the utility model will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:
fig. 1 is a system diagram of a microphone switching circuit according to an embodiment of the utility model;
FIG. 2 is a schematic diagram of a selection circuit according to an embodiment of the utility model;
fig. 3 is a schematic diagram of a wired earphone access module according to an embodiment of the present utility model.
Reference numerals:
a selection circuit 100,
Bluetooth chip 200,
A wired earphone access module 300,
Microphone 400,
A power amplifier unit 510, a speaker 520,
Terminal device 600.
Detailed Description
Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the utility model.
In the description of the present utility model, the description of first, second, etc. is for the purpose of distinguishing between technical features only and should not be construed as indicating or implying a 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 utility model, it should be understood that the direction or positional relationship indicated with respect to the description of the orientation, such as up, down, etc., is based on the direction or positional relationship shown in the drawings, is merely for convenience of describing the present utility model and simplifying the description, and does not indicate or imply that the apparatus 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 utility model.
In the description of the present utility model, unless explicitly defined otherwise, terms such as arrangement, installation, connection, etc. should be construed broadly and the specific meaning of the terms in the present utility model can be determined reasonably by a person skilled in the art in combination with the specific content of the technical solution.
The following description of the embodiments of the present utility model will be made with reference to the accompanying drawings, in which it is apparent that the embodiments described below are some, but not all embodiments of the utility model.
Referring to fig. 1, fig. 1 is a circuit schematic diagram of a microphone switching circuit according to an embodiment of the present utility model, which includes a selection circuit 100, a bluetooth chip 200 and a wired earphone access module 300,
the selection circuit 100 has a microphone connection terminal, a first power supply terminal, a second power supply terminal, and a selection switch terminal, where the microphone connection terminal is used to connect with the microphone 400;
the Bluetooth chip 200 is provided with a first audio output end, a wired feedback input end, a switching control end and a first voltage end, wherein the first voltage end is connected with a first power supply end, the switching control end is connected with a selection switching end, and the first audio output end is used for being connected with an audio playing unit; the bluetooth chip 200 is used for adjusting the communication state among the first power supply end, the second power supply end and the microphone connection end;
the wired earphone access module 300 is provided with a wired access signal feedback end, a second voltage end and a second audio output end, wherein the wired access signal feedback end is connected with the wired feedback input end, the second voltage end is connected with the second power supply end, and the second audio output end is connected with the audio playing unit; the wired earphone access module 300 is configured to connect to the terminal device 600, and adjust working states of the wired access signal feedback end, the second voltage end, and the second audio output end according to a connection state with the terminal device 600.
The wired earphone access module 300 may be electrically connected to the terminal device 600 in a detachable manner, and when the wired earphone access module 300 is not connected to the terminal device 600, the wired access signal feedback end, the second voltage end and the second audio output end cannot output a normal working signal because there is no source of an input signal, and the wired access signal feedback end can only output a low level, the second voltage end has no voltage output, and the second audio output end has no audio output. When the wired earphone access module 300 is connected with the terminal device 600, the wired access signal feedback end, the second voltage end and the second audio output end can transmit signals input by the terminal device 600, the wired access signal feedback end can output high level, the second voltage end outputs working voltage, and the second audio output end outputs audio.
The bluetooth chip 200 may detect a feedback signal output by the wired access signal feedback end of the wired earphone access module 300, when the feedback signal is at a low level, the bluetooth chip 200 may determine that the current no-terminal device 600 is accessed, the bluetooth chip 200 may control the connection end of the microphone of the selection circuit 100 to be connected with the first power supply end, directly power the microphone 400 by using the bluetooth chip 200, and simultaneously, the bluetooth chip 200 may also receive a voice audio signal collected by the microphone 400 through its ADC port, and then wirelessly transmit the voice audio signal to the terminal device 600. When the feedback signal is at a high level, the bluetooth chip 200 may determine that the current terminal device 600 and the wired earphone access module 300 are connected, and the bluetooth chip 200 may be turned off, at this time, the signal of the selection switch end of the selection circuit 100 is changed, the microphone connection end of the selection circuit 100 is connected to the second power supply end, and the power output by the second voltage end of the wired earphone access module 300 is used to power the microphone 400, and at the same time, under the condition of wired connection, the voice audio signal collected by the microphone 400 may be directly transmitted back to the mobile phone through the wired earphone access module 300.
The microphone switching circuit of the embodiment of the utility model can be connected with the terminal equipment 600 through the wired earphone access module 300, so that a feedback signal can be output to the Bluetooth chip 200 when the terminal equipment 600 is connected, the Bluetooth chip 200 can adjust the output of the switching control end according to the feedback signal, so that the second power supply end is connected with the microphone connecting end, and the terminal equipment 600 can supply power to the microphone 400. In addition, when the wired earphone access module 300 is not connected with the terminal device 600, the bluetooth chip 200 cannot receive the feedback signal, so that the power can be switched to the bluetooth chip 200 to supply power, and the normal use of the microphone 400 is ensured. The microphone switching circuit of the embodiment of the utility model utilizes the wired earphone access module 300 as feedback and combines the switching function of the selection circuit 100 to realize automatic switching of the Bluetooth mode and the wired mode, thereby greatly improving the use experience of users. In addition, the utility model multiplexes the microphone circuit, and can save cost and structural design space.
In some embodiments, the selection circuit 100 includes: the first switching tube, the second switching tube, the third switching tube and the fourth switching tube;
the first switch tube, its drain electrode is connected with first voltage end, the source electrode is connected with microphone 400, connect with the first resistance R35 between grid and the source electrode;
the grid electrode of the second switching tube is connected with the switching control end, the drain electrode of the second switching tube is connected with the grid electrode of the first switching tube, the source electrode of the second switching tube is connected with the ground wire, and a second resistor R36 is connected between the source electrode and the grid electrode;
the drain electrode of the third switching tube is connected with the second voltage end, and the grid electrode of the third switching tube is connected with the grid electrode of the second switching tube;
and the source electrode of the fourth switching tube is connected with the source electrode of the third switching tube, the grid electrode of the fourth switching tube is connected with the grid electrode of the third switching tube, and the drain electrode of the fourth switching tube is connected with the source electrode of the first switching tube.
When the wired access signal feedback end outputs a low level, the switching control end of the bluetooth chip 200 outputs a high level, so as to control the second switching tube to be conducted, and further, the first switching tube to be conducted, at this time, the third switching tube and the fourth switching tube are closed, and the voltage output by the first voltage end of the bluetooth chip 200 can reach the microphone 400 through the first switching tube to supply power to the microphone 400. At this time, the third switching tube may also function to prevent the voltage output from the first voltage terminal from being reversely connected to the second voltage terminal of the wired earphone access module 300.
When the wired access signal feedback end outputs a high level, the bluetooth chip 200 stops outputting, the switching control end of the bluetooth chip 200 outputs a low level, at this time, the second switching tube is turned off, so that the first switching tube is turned off, the second resistor R36 is grounded, at this time, the third switching tube and the fourth switching tube are turned on, and the voltage output by the second voltage end of the wired earphone access module 300 can reach the microphone 400 through the third switching tube and the fourth switching tube to supply power to the microphone 400.
In some embodiments, a first capacitor C28 is connected between the drain of the first switching tube and ground. A second capacitor C27 is connected between the drain electrode of the fourth switching tube and the ground wire. The first capacitor C28 and the second capacitor C27 can be used for filtering the transmitted signal, so that the quality of the signal is improved.
In some embodiments, a magnetic bead is connected between the drain of the fourth switching tube and the microphone 400. The magnetic beads can be used for filtering signals, so that the stability of signal transmission is ensured.
In some embodiments, the first switching tube, the second switching tube, the third switching tube and the fourth switching tube are all MOS tubes. The MOS tube has the capability of controlling the switch, and can meet the requirements of the embodiment of the utility model. In some embodiments, the first, third and fourth switching tubes are PMOS tubes and the second switching tube is an NMOS tube.
In some embodiments, the audio playback unit comprises: a power amplification unit 510 and a speaker 520; the input end of the power amplification unit 510 is connected with the first audio output end; the speaker 520 is connected to the output terminal of the power amplifying unit 510 and the second audio output terminal, respectively. The bluetooth chip 200 receives the audio data wirelessly transmitted by the terminal device 600, after being processed by the bluetooth chip 200, a certain power amplification process is required to be performed by the power amplification unit 510, and the wired earphone access module 300 is directly connected with the terminal device 600, so that the terminal device 600 can directly transmit the audio data to the speaker 520 for playing through the wired earphone access module 300.
In some embodiments, the wired headset access module 300 employs an AUX connection. The 3.5mm AUX connector is the most common wired earphone wiring connector on the market and can be adapted to more models of terminal devices 600. It can be understood that the AUX joint with the thickness of 3.5mm can be replaced by other joints according to actual requirements, and composite ports of joints with various types can be manufactured.
In some embodiments, a third capacitor C18 is connected between the wired access signal feedback terminal and ground. The third capacitor C18 can be used to filter the transmission signal, so as to improve the quality of the transmission signal.
In some embodiments, a magnetic bead is connected between the second voltage terminal and the second power supply terminal. The magnetic beads can be used for filtering signals, so that the stability of signal transmission is ensured.
In order to better describe the microphone switching circuit of the embodiments of the present utility model, the microphone switching circuit is further described herein by way of specific embodiments.
In this embodiment, the first switching tube is a first PMOS tube Q1, the second switching tube is an NMOS tube Q2, the third switching tube is a second PMOS tube Q3, and the fourth switching tube is a third PMOS tube Q4; the drain electrode of the first PMOS tube Q1 is connected with a first voltage end MIC_BIAS, the source electrode is connected with the microphone 400, and a first resistor R35 is connected between the source electrode and the grid electrode; the grid electrode of the NMOS tube Q2 is connected with a switching control end VDD33, the drain electrode is connected with the grid electrode of the first PMOS tube Q1, the source electrode is connected with the ground wire, and a second resistor R36 is connected between the source electrode and the grid electrode; the drain electrode of the second PMOS tube Q3 is connected with a second voltage end TACK_MIC+, and the grid electrode is connected with the grid electrode of the NMOS tube Q2; the source electrode of the third PMOS tube Q4 is connected with the source electrode of the second PMOS tube Q3, the grid electrode is connected with the grid electrode of the second PMOS tube Q3, and the drain electrode is connected with the microphone 400.
When the wired access signal feedback terminal aux_det is at a low level, the switching control terminal VDD33 of the bluetooth chip 200 outputs a high level, thereby controlling the NMOS transistor Q2 to be turned on, and further enabling the first PMOS transistor Q1 to be turned on, at this time, the second PMOS transistor Q3 and the third PMOS transistor Q4 are turned off, and the voltage output by the first voltage terminal mic_bias of the bluetooth chip 200 can reach the microphone 400 through the first PMOS transistor Q1 to supply power to the microphone 400. At this time, the second PMOS transistor Q3 may also play a role in preventing the voltage output by the first voltage terminal mic_bias from being reversely connected to the second voltage terminal tack_mic+ of the wired earphone access module 300. In addition, the audio data collected by the microphone is also input to the ADC port of the bluetooth chip 200, and is further transmitted to the terminal device by the bluetooth chip through HFP protocol.
When the wired access signal feedback end aux_det is at a high level, the bluetooth chip 200 stops outputting, the switching control end VDD33 of the bluetooth chip 200 outputs a low level, the NMOS transistor Q2 is turned off, so that the first PMOS transistor Q1 is turned off, the second resistor R36 is grounded, at this time, the second PMOS transistor Q3 and the third PMOS transistor Q4 are turned on, and the voltage output by the second voltage end tack_mic+ of the wired earphone access module 300 can reach the microphone 400 through the second PMOS transistor Q3 and the third PMOS transistor Q4, so as to supply power to the microphone 400. In addition, the microphone collected audio data can be directly transmitted back to the terminal device through the second voltage terminal tack_mic+ of the wired earphone access module 300.
It can be understood that the terminal device may be a portable mobile device such as a mobile phone, a tablet, or a conventional device such as a desktop computer or a notebook.
The microphone switching circuit of this embodiment may be connected to the terminal device 600 through the wired earphone access module 300, so that a feedback signal is output to the bluetooth chip 200 when the terminal device 600 is connected, so that the bluetooth chip 200 may adjust the working states of the first PMOS transistor Q1, the NMOS transistor Q2, the second PMOS transistor Q3 and the third PMOS transistor Q4 according to the feedback signal, so that the second power supply terminal is connected to the microphone connection terminal, and power supply for the microphone 400 by the terminal device 600 is realized. In addition, when the wired earphone access module 300 is not connected with the terminal device 600, the bluetooth chip 200 cannot receive the feedback signal, so that the power can be switched to the bluetooth chip 200 to supply power, and the normal use of the microphone 400 is ensured. The microphone switching circuit of the embodiment uses the wired earphone access module 300 as feedback, and combines the switching function of the selection circuit 100, so that the automatic switching of the Bluetooth mode and the wired mode is realized, and the use experience of a user is greatly improved. In addition, the microphone circuit is multiplexed in the embodiment, so that the cost and the structural design space can be saved.
The embodiment of the utility model also provides an earphone which comprises the microphone switching circuit. The earphone in the embodiment of the utility model comprises the microphone switching circuit, so that the earphone has all the beneficial effects of the microphone switching circuit.
The embodiments of the present utility model have been described in detail with reference to the accompanying drawings, but the present utility model is not limited to the above embodiments, and various changes can be made within the knowledge of one of ordinary skill in the art without departing from the spirit of the present utility model.
Claims (10)
1. A microphone switching circuit, comprising:
the selection circuit is provided with a microphone connecting end, a first power supply end, a second power supply end and a selection switching end, wherein the microphone connecting end is used for connecting a microphone;
the Bluetooth chip is provided with a first audio output end, a wired feedback input end, a switching control end and a first voltage end, wherein the first voltage end is connected with the first power supply end, the switching control end is connected with the selection switching end, and the first audio output end is used for being connected with an audio playing unit; the Bluetooth chip is used for adjusting the communication state among the first power supply end, the second power supply end and the microphone connecting end;
the wired earphone access module is provided with a wired access signal feedback end, a second voltage end and a second audio output end, wherein the wired access signal feedback end is connected with the wired feedback input end, the second voltage end is connected with the second power supply end, and the second audio output end is connected with the audio playing unit; the wired earphone access module is used for connecting terminal equipment and adjusting working states of the wired access signal feedback end, the second voltage end and the second audio output end according to the connection state with the terminal equipment.
2. The microphone switching circuit of claim 1 wherein the selection circuit comprises:
the drain electrode of the first switch tube is connected with the first voltage end, the source electrode of the first switch tube is connected with the microphone, and a first resistor is connected between the source electrode and the grid electrode;
the grid electrode of the second switching tube is connected with the switching control end, the drain electrode of the second switching tube is connected with the grid electrode of the first switching tube, the source electrode of the second switching tube is connected with the ground wire, and a second resistor is connected between the source electrode and the grid electrode;
the drain electrode of the third switching tube is connected with the second voltage end, and the grid electrode of the third switching tube is connected with the grid electrode of the second switching tube;
and the source electrode of the fourth switching tube is connected with the source electrode of the third switching tube, the grid electrode of the fourth switching tube is connected with the grid electrode of the third switching tube, and the drain electrode of the fourth switching tube is connected with the source electrode of the first switching tube.
3. The microphone switching circuit of claim 2 wherein a first capacitance is connected between the drain of the first switching tube and ground.
4. The microphone switching circuit of claim 2 wherein a second capacitor is connected between the drain of the fourth switching tube and ground.
5. The microphone switching circuit of claim 2 wherein the first switching tube, the second switching tube, the third switching tube, and the fourth switching tube are all MOS tubes.
6. The microphone switching circuit of claim 1 wherein the audio playback unit comprises:
the input end of the power amplification unit is connected with the first audio output end;
and the loudspeaker is respectively connected with the output end of the power amplification unit and the second audio output end.
7. The microphone switching circuit of claim 1 wherein the wired headset access module employs an AUX connection.
8. The microphone switching circuit of claim 1 wherein a third capacitor is connected between the wired access signal feedback terminal and ground.
9. Microphone switching circuit according to claim 1 or 8, characterized in that a magnetic bead is connected between the second voltage terminal and the second power supply terminal.
10. An earphone comprising a microphone switching circuit as claimed in any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320743312.6U CN219876065U (en) | 2023-03-31 | 2023-03-31 | Microphone switching circuit and earphone |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320743312.6U CN219876065U (en) | 2023-03-31 | 2023-03-31 | Microphone switching circuit and earphone |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219876065U true CN219876065U (en) | 2023-10-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320743312.6U Active CN219876065U (en) | 2023-03-31 | 2023-03-31 | Microphone switching circuit and earphone |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219876065U (en) |
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- 2023-03-31 CN CN202320743312.6U patent/CN219876065U/en active Active
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