CN109151691B - Silicon microphone with adjustable directivity - Google Patents
Silicon microphone with adjustable directivity Download PDFInfo
- Publication number
- CN109151691B CN109151691B CN201811139971.9A CN201811139971A CN109151691B CN 109151691 B CN109151691 B CN 109151691B CN 201811139971 A CN201811139971 A CN 201811139971A CN 109151691 B CN109151691 B CN 109151691B
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- China
- Prior art keywords
- resistor
- capacitor
- microphone
- sound
- operational amplifier
- 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.)
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Links
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 title claims abstract description 24
- 229910052710 silicon Inorganic materials 0.000 title claims abstract description 24
- 239000010703 silicon Substances 0.000 title claims abstract description 24
- RVCKCEDKBVEEHL-UHFFFAOYSA-N 2,3,4,5,6-pentachlorobenzyl alcohol Chemical compound OCC1=C(Cl)C(Cl)=C(Cl)C(Cl)=C1Cl RVCKCEDKBVEEHL-UHFFFAOYSA-N 0.000 claims abstract description 29
- 239000003990 capacitor Substances 0.000 claims description 38
- 238000006243 chemical reaction Methods 0.000 claims description 5
- 238000010586 diagram Methods 0.000 description 6
- 230000035945 sensitivity Effects 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005236 sound signal Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R19/00—Electrostatic transducers
- H04R19/04—Microphones
-
- 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
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)
- Circuit For Audible Band Transducer (AREA)
Abstract
The invention relates to the technical field of silicon microphones, and particularly discloses a directivity-adjustable silicon microphone which comprises a sound seat upper cover and a sound seat lower cover, wherein a PCBA plate is arranged between the sound seat upper cover and the sound seat lower cover, sound tuning paper is arranged in the sound seat lower cover, an upper microphone is arranged on the upper surface of the PCBA plate, and a lower microphone is arranged on the lower surface of the PCBA plate.
Description
Technical Field
The invention relates to the technical field of silicon microphones, in particular to a silicon microphone with adjustable directivity.
Background
A complete sound amplifying system is composed of silicon microphone, amplifier and loudspeaker for amplifying and outputting sound, but its operation mode is that silicon microphone converts audio signal into electric signal, amplifier amplifies the electric signal and sends it to loudspeaker, and loudspeaker converts the amplified electric signal into sound for sending. Under the system, if the silicon microphone has no directivity, the receiving sensitivity of the silicon microphone in all directions is the same, so that feedback phenomenon is easy to be caused, and the loudspeaker emits harsh whistling sounds.
At present, only the full-directional silicon microphone is available in the market, the full-directional silicon microphone has the characteristics of high sensitivity, small distortion and good consistency, and in practical application, a plurality of occasions need to use the single-directional silicon microphone, and the single-directional silicon microphone has poor effect in the aspects of sensitivity, distortion and consistency.
Disclosure of Invention
Aiming at the technical problems, the invention provides the silicon microphone with adjustable directivity, which maintains the characteristics of high sensitivity, small distortion and good consistency of the full-directional silicon microphone and meets the unidirectional pickup requirement.
In order to solve the technical problems, the invention provides the following specific scheme: the utility model provides a silicon miaow of adjustable directionality, includes headstock upper cover and headstock lower cover, be equipped with PCBA board between headstock upper cover and the headstock lower cover, be equipped with tuning paper in the headstock lower cover lid, the upper surface of PCBA board is equipped with the miaow head, and the lower surface of PCBA board is equipped with the miaow head down.
Preferably, the upper cover and the lower cover of the sound head seat are respectively provided with a sound pick-up hole, so that the upper microphone and the lower microphone can pick up external sound sources conveniently.
Preferably, the upper cover and the lower cover of the sound head seat are connected through threads, other accessories are not needed to be assembled in a matched mode, assembly efficiency is improved, and the sound head seat is convenient to detach.
Preferably, the PCBA board is provided with a pickup hole, so that the upper microphone and the lower microphone can pick up external sound sources conveniently.
Preferably, the PCBA board is provided with a conversion circuit which is respectively connected with the upper microphone and the lower microphone, and the sound sources picked up by the upper microphone and the lower microphone are amplified comprehensively and then output, so that the silicon microphone with adjustable directivity is obtained.
Compared with the prior art, the invention has the beneficial effects that: the upper microphone and the lower microphone can pick up external sound sources at the same time, the time for the external sound sources to reach the lower microphone is delayed by controlling the density of the tuning paper, and the sound sources picked up by the upper microphone and the lower microphone are amplified comprehensively through the PCBA board and then output, so that the characteristics of high sensitivity, small distortion and good consistency peculiar to the all-directional silicon microphone are maintained, and meanwhile, the unidirectional pickup requirement is met.
Drawings
FIGS. 1 and 2 are schematic views of the overall structure of the present invention;
FIG. 3 is an exploded view of the overall structure of the present invention;
FIGS. 4 and 5 are schematic structural views of PCBA boards;
FIG. 6 is a schematic diagram of practical application;
FIG. 7 is a schematic diagram of a specific circuit connection on a PCBA board;
wherein 1 is a sound head seat upper cover; 2 is a lower cover of the sound head seat; 3 is PCBA board; 31 is an upper microphone; 32 is a lower microphone; 4 is tone tuning paper; and 5 is a sound pick-up hole.
Detailed Description
In order to describe the technical solution of the present invention in detail, the following description will be made clearly and completely by referring to the drawings of the embodiments of the present invention. It will be apparent that the described embodiments are some, but not all, embodiments of the invention. All other embodiments, which can be made by a person skilled in the art without creative efforts, based on the described embodiments of the present invention fall within the protection scope of the present invention.
Referring to fig. 1-6, the embodiment provides a silicon microphone with adjustable directivity, which comprises a sound seat upper cover and a sound seat lower cover, wherein a PCBA plate is arranged between the sound seat upper cover and the sound seat lower cover, tuning paper is arranged in the sound seat lower cover, an upper microphone is arranged on the upper surface of the PCBA plate, a lower microphone is arranged on the lower surface of the PCBA plate, fig. 1 and 2 are overall structure diagrams of the silicon microphone in different directions, fig. 1 is a top direction diagram, and fig. 2 is a bottom direction diagram; fig. 4 and 5 are schematic views of the PCBA board in different directions, fig. 3 is a schematic view of the upper surface, and fig. 4 is a schematic view of the lower surface.
The sound pickup holes are formed in the upper sound seat cover, the lower sound seat cover and the PCBA board, so that the upper sound head and the lower sound head can pick up external sound sources conveniently, the upper sound seat cover and the lower sound seat cover are connected through threads, other accessories are not required to be matched and assembled, the assembly efficiency is improved, and the sound pickup device is convenient to detach.
In this embodiment, a front cavity is formed between the PCBA board and the upper cover of the sound seat, a rear cavity is formed between the PCBA board and the lower cover of the sound seat, an upper microphone is disposed on the upper surface of the PCBA board, a lower microphone is disposed on the lower surface of the PCBA board, the upper microphone and the lower microphone can pick up external sound sources at the same time, but tuning paper in the cover of the lower cover of the sound seat can delay the time for the external sound sources to reach the lower microphone, if the delay is short, thin tuning paper is selected, otherwise, the time difference between the front cavity and the rear cavity is utilized to offset, so as to obtain the adjustable directive silicon microphone, as shown in fig. 6, the principle schematic diagram in practical application is shown, the upper microphone and the lower microphone pick up external sound sources, after the integrated amplified sound sources are output through the PCBA board, and the legend shown in the figure is only a part of the output legend.
The PCBA board is provided with a conversion circuit which is respectively connected with an upper microphone and a lower microphone, sound sources picked up by the upper microphone and the lower microphone are amplified comprehensively and then output to obtain an adjustable directivity silicon microphone, and as shown in figure 7, the conversion circuit comprises operational amplifiers U2-C and U2-B, a resistor R11, a capacitor C16 and a resistor R13 which are connected with the upper microphone, resistors R12 and R14 and a capacitor C15 which are connected with the lower microphone, the resistor R13 is connected with a capacitor C20 in parallel and then grounded, the other end of the capacitor C20 is also connected with a resistor R16, the other end of the resistor R16 is connected with a power supply, the other end of the resistor R11 is grounded, the capacitor C16 is connected with a resistor R10, the resistor R10 is connected with the negative input end of an operational amplifier U2-B, the negative input end of the operational amplifier U2-B is also connected with a resistor R8 and a capacitor C14 which are connected in parallel and then with the output end of the operational amplifier U2-B, the output end of the operational amplifier U2-B is connected with a capacitor C18 which is connected with the output of the capacitor C18 for amplifying; the resistor R12 is connected in parallel with the capacitor C19, the resistor R12 and the capacitor C19 are connected in parallel and then grounded, the other end of the capacitor C19 is also connected with the resistor R15, the other end of the resistor R15 is connected with a power supply, the other end of the resistor R12 is grounded, the capacitor C15 is connected with the resistor R9, and the resistor R9 is connected with the negative input end of the operational amplifier U2-B; the positive input end of the operational amplifier U2-B is connected with a capacitor C24, the capacitor C24 is connected with a capacitor C23 and a resistor R21 in parallel, the resistor R21 is connected with a resistor R20 in series, the resistor R21 and the resistor R20 are connected with a capacitor C22 and a capacitor C21 in parallel after being connected with each other in series, the common end of the parallel connected capacitor C21 is connected to the power end and the grounding end of the operational amplifier U2-C, the power end of the operational amplifier U2-C is connected with a resistor R19, and the resistor R19 is connected with a power supply.
The embodiments of the present invention have been described in detail with reference to the drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the spirit of the present invention.
Claims (1)
1. Silicon miaow of adjustable directionality, its characterized in that: the sound adjusting device comprises a sound head seat upper cover (1) and a sound head seat lower cover (2), wherein a PCBA plate (3) is arranged between the sound head seat upper cover (1) and the sound head seat lower cover (2), sound adjusting paper (4) is arranged in the sound head seat lower cover (2), an upper microphone (31) is arranged on the upper surface of the PCBA plate (3), and a lower microphone (32) is arranged on the lower surface of the PCBA plate (3);
the sound head seat upper cover (1) and the sound head seat lower cover (2) are respectively provided with a sound pick-up hole (5);
a sound pick-up hole (5) is formed in the PCBA (3);
the PCBA board (3) is provided with a conversion circuit which is respectively connected with the upper microphone (31) and the lower microphone (32);
the conversion circuit comprises operational amplifiers U2-C and U2-B, a resistor R11, a capacitor C16 and a resistor R13 which are connected with an upper microphone, resistors R12, R14 and a capacitor C15 which are connected with a lower microphone, wherein the resistor R13 is connected with a capacitor C20 in parallel, the resistor R13 is connected with the capacitor C20 in parallel and then grounded, the other end of the capacitor C20 is also connected with the resistor R16, the other end of the resistor R16 is connected with a power supply, the other end of the resistor R11 is grounded, the capacitor C16 is connected with a resistor R10, the resistor R10 is connected with the negative input end of the operational amplifier U2-B, the negative input end of the operational amplifier U2-B is also connected with a resistor R8 and a capacitor C14, the resistor R8 and the capacitor C14 are connected with the output end of the operational amplifier U2-B in parallel, and the output end of the operational amplifier U2-B is connected with a capacitor C18, and amplified sound sources are output; the resistor R12 is connected in parallel with the capacitor C19, the resistor R12 and the capacitor C19 are connected in parallel and then grounded, the other end of the capacitor C19 is also connected with the resistor R15, the other end of the resistor R15 is connected with a power supply, the other end of the resistor R12 is grounded, the capacitor C15 is connected with the resistor R9, and the resistor R9 is connected with the negative input end of the operational amplifier U2-B; the positive input end of the operational amplifier U2-B is connected with a capacitor C24, the capacitor C24 is connected with a capacitor C23 and a resistor R21 in parallel, the resistor R21 is connected with a resistor R20 in series, the resistor R21 and the resistor R20 are connected with a capacitor C22 and a capacitor C21 in parallel after being connected in series, the common end of the parallel connected capacitor C22 and capacitor C21 is connected to the power end and the grounding end of the operational amplifier U2-C, the power end of the operational amplifier U2-C is connected with a resistor R19, and the resistor R19 is connected with a power supply;
the upper cover (1) and the lower cover (2) of the sound head seat are connected through threads.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811139971.9A CN109151691B (en) | 2018-09-28 | 2018-09-28 | Silicon microphone with adjustable directivity |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811139971.9A CN109151691B (en) | 2018-09-28 | 2018-09-28 | Silicon microphone with adjustable directivity |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109151691A CN109151691A (en) | 2019-01-04 |
| CN109151691B true CN109151691B (en) | 2023-11-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811139971.9A Active CN109151691B (en) | 2018-09-28 | 2018-09-28 | Silicon microphone with adjustable directivity |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109151691B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114501283B (en) * | 2022-04-15 | 2022-06-28 | 南京天悦电子科技有限公司 | Low-complexity double-microphone directional sound pickup method for digital hearing aid |
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| US7881486B1 (en) * | 1996-12-31 | 2011-02-01 | Etymotic Research, Inc. | Directional microphone assembly |
| CN2449433Y (en) * | 2000-09-25 | 2001-09-19 | 张昭智 | Microphone sound head |
| WO2007032581A1 (en) * | 2005-09-15 | 2007-03-22 | Bse Co., Ltd | Silicon based condenser microphone |
| JP2007124452A (en) * | 2005-10-31 | 2007-05-17 | Sanyo Electric Co Ltd | Acoustic sensor |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN109151691A (en) | 2019-01-04 |
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