CN104284277A - Microphone circuit for laptop - Google Patents
Microphone circuit for laptop Download PDFInfo
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- CN104284277A CN104284277A CN201410619262.6A CN201410619262A CN104284277A CN 104284277 A CN104284277 A CN 104284277A CN 201410619262 A CN201410619262 A CN 201410619262A CN 104284277 A CN104284277 A CN 104284277A
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- electric capacity
- integrated chip
- frequency modulation
- modulation integrated
- microphone
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Abstract
The invention discloses a microphone circuit for a laptop. The microphone circuit for the laptop comprises a battery, a single-pole double-throw switch, a first microphone, a second microphone, a first inductance coil, a second inductance coil, a first compactor to the eleventh capacitor, a first resistor to a fifth resistor, a diode, a light emitting diode, an SMD transistor, an antenna and a frequency modulation integrated chip with the model of BA1404. Two electret microphones are adopted in the microphone circuit for the laptop, one is in a source electrode amplification mode and the other one is in a drain electrode amplification mode; one frequency modulation integrated chip and the two audio input ends of the frequency modulation integrated chip are respectively connected with the two microphones; the frequency modulation integrated chip is internally provided with two symmetrical amplifiers; signals received by the two microphones are amplified and mixed, and then are output by a dual-track compound signal output end of the frequency modulation integrated chip, and the microphone circuit for the laptop is simple in circuit structure, small in element quantity, low in cost and high in interference resistance and can ensure clear and loud pickup tone quality.
Description
Technical field
The present invention relates to a kind of circuit of notebook computer input equipment, particularly relate to a kind of notebook computer microphone circuit.
Background technology
Notebook computer is a kind of small-sized, portable PC, and along with scientific technological advance and electronic equipment constantly update, its development trend is that volume is more and more less, and weight is more and more lighter, and function is powerful all the more.It is an advantage compared to desktop computer that notebook computer carries microphone apparatus, microphone formal name used at school is microphone, it is energy conversion device voice signal being converted to the signal of telecommunication, also microphone is claimed, microphone, twentieth century, microphone develops into inductance by changing acoustic-electric by resistance at first, condenser type is changed, microphone techniques new in a large number grows up gradually, this is comprising aluminium strip, the microphones such as moving-coil, and current widely used capacitance microphone and electret microphone, but, the microphone circuit complex structure of many notebook computers, element is many, cost is high, anti-interference is poor, pickup effect is poor, be difficult to universal and promote.
Summary of the invention
Object of the present invention is just to provide a kind of notebook computer microphone circuit to solve the problem.
The present invention is achieved through the following technical solutions above-mentioned purpose:
The present invention includes battery, single-pole double-throw switch (SPDT), first microphone, second microphone, first inductance coil, second inductance coil, first electric capacity is to the 11 electric capacity, first resistance is to the 5th resistance, diode, light-emitting diode, paster triode, antenna and model are the frequency modulation integrated chip of BA1404, the positive pole of described battery is connected with the first end of described single-pole double-throw switch (SPDT) simultaneously, second end of described single-pole double-throw switch (SPDT) simultaneously with the first end of described 4th resistance, the first end of described second inductance coil, the first end of described tenth electric capacity is connected with the first end of described 3rd resistance, the control end of described single-pole double-throw switch (SPDT) connects the negative pole of described diode, the positive pole of described diode connects the collector electrode of described paster triode, the base stage of described paster triode connects the first end of described 11 electric capacity, second end of described 11 electric capacity simultaneously with the first end of described tenth electric capacity, the first end of described second inductance coil, the radio frequency amplifier output of described frequency modulation integrated chip is connected with the first end of described 8th electric capacity, second end of described 4th resistance connects the positive pole of described light-emitting diode, second end of described 8th electric capacity is connected with the first strength network terminal of described frequency modulation integrated chip and the first end of described 9th electric capacity simultaneously, second end of described 9th electric capacity simultaneously with the second strength network terminal of described frequency modulation integrated chip, the first end of described 6th electric capacity is connected with the first end of described first inductance coil, second end of described first inductance coil simultaneously with the second end of described 6th electric capacity, second end of described 3rd resistance, the cathode voltage input of described frequency modulation integrated chip, the first end of described 4th electric capacity, the first end of described 3rd electric capacity, second end of described second resistance is connected with the first end of described second microphone, the modulation signal input of described frequency modulation integrated chip is connected with the first end of the 5th resistance and the first end of described 5th electric capacity simultaneously, second end of described 5th electric capacity connects described antenna, second end of described 5th resistance connects the dual track composite signal output connection of described frequency modulation integrated chip, the left audio input of described frequency modulation integrated chip connects the first end of described second electric capacity, second end of described second electric capacity is connected with the second end of described second microphone and the first end of described first resistance simultaneously, the right audio channel input of described frequency modulation integrated chip connects the first end of described first electric capacity, second end of described first electric capacity is connected with the second end of described second resistance and the first end of described first microphone simultaneously, the audio frequency amplifier offset side of described frequency modulation integrated chip connects the first end of described 7th electric capacity, second end of described first microphone simultaneously with the second end of described first resistance, the emitter-base bandgap grading of described paster triode, the negative pole of described battery, second end of described 3rd electric capacity, second end of described 4th electric capacity, second end of described 7th electric capacity, the audio frequency amplifier earth terminal of described frequency modulation integrated chip, the radio frequency amplifier earth terminal of described frequency modulation integrated chip and the minus earth of described light-emitting diode.
Beneficial effect of the present invention is:
The present invention adopts two Electret condenser microphones, one is source electrode amplification, one is drain electrode amplification, adopt a frequency modulation integrated chip, two microphones are connect respectively two audio input ends of frequency modulation integrated chip, there are two symmetrical amplifiers frequency modulation integrated chip inside, and the signal that two microphones receive is exported by the dual track composite signal output of frequency modulation integrated chip after amplifying mixing, and circuit structure is simple, element is few, cost is low, strong interference immunity, pickup sound sound clarity is loud.
Accompanying drawing explanation
Fig. 1 is circuit structure schematic diagram of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described:
As shown in Figure 1: the present invention includes battery E, single-pole double-throw switch (SPDT) S, first microphone BM1, second microphone BM2, first inductance coil L1, second inductance coil L2, first electric capacity C1 is to the 11 electric capacity C11, first resistance R1 is to the 5th resistance R5, diode VD, LED, paster triode Q, antenna Y and model are the frequency modulation integrated chip IC of BA1404, the positive pole of battery E is connected with the first end of single-pole double-throw switch (SPDT) S simultaneously, second end of single-pole double-throw switch (SPDT) S simultaneously with the first end of the 4th resistance R4, the first end of the second inductance coil L2, the first end of the tenth electric capacity C10 is connected with the first end of the 3rd resistance R3, the control end of single-pole double-throw switch (SPDT) S connects the negative pole of diode VD, the positive pole of diode VD connects the collector electrode of paster triode Q, the base stage of paster triode Q connects the first end of the 11 electric capacity C11, second end of the 11 electric capacity C11 simultaneously with the first end of the tenth electric capacity C10, the first end of the second inductance coil L2, the radio frequency amplifier output of frequency modulation integrated chip IC is connected with the first end of the 8th electric capacity C8, the positive pole of the second end connecting luminous diode LED of the 4th resistance R4, second end of the 8th electric capacity C8 is connected with the first strength network terminal of frequency modulation integrated chip IC and the first end of the 9th electric capacity C9 simultaneously, second end of the 9th electric capacity C9 simultaneously with the second strength network terminal of frequency modulation integrated chip IC, the first end of the 6th electric capacity C6 is connected with the first end of the first inductance coil L1, second end of the first inductance coil L1 simultaneously with second end of the 6th electric capacity C6, second end of the 3rd resistance R3, the cathode voltage input of frequency modulation integrated chip IC, the first end of the 4th electric capacity C4, the first end of the 3rd electric capacity C3, second end of the second resistance R2 is connected with the first end of the second microphone BM2, the modulation signal input of frequency modulation integrated chip IC is connected with the first end of the 5th resistance R5 and the first end of the 5th electric capacity C5 simultaneously, second end of the 5th electric capacity C5 connects antenna Y, second end of the 5th resistance R5 connects the dual track composite signal output connection of frequency modulation integrated chip IC, the left audio input of frequency modulation integrated chip IC connects the first end of the second electric capacity C2, second end of the second electric capacity C2 is connected with second end of the second microphone BM2 and the first end of the first resistance R1 simultaneously, the right audio channel input of frequency modulation integrated chip IC connects the first end of the first electric capacity C1, second end of the first electric capacity C1 is connected with second end of the second resistance R2 and the first end of the first microphone BM1 simultaneously, the audio frequency amplifier offset side of frequency modulation integrated chip IC connects the first end of the 7th electric capacity C7, second end of the first microphone BM1 simultaneously with second end of the first resistance R1, the emitter-base bandgap grading of paster triode Q, the negative pole of battery E, second end of the 3rd electric capacity C3, second end of the 4th electric capacity C4, second end of the 7th electric capacity C7, the audio frequency amplifier earth terminal of frequency modulation integrated chip IC, the radio frequency amplifier earth terminal of frequency modulation integrated chip IC and the minus earth of LED.
Operation principle of the present invention:
As shown in Figure 1: the present invention has selected model to be the frequency modulation integrated chip IC of BA1404, eliminate stereo coding circuit wherein, circuit structure is simple, and the first microphone BM1 and the second microphone BM2 all adopts Electret condenser microphone, because Electret condenser microphone is non-directional, in use be very easy to self-excitation, for this reason, adopt two microphones, one is source electrode amplification, one is drain electrode amplification, connects left audio input and the right audio channel input of frequency modulation integrated chip IC respectively.There are two symmetrical amplifiers frequency modulation integrated chip IC inside, and the signal that the first microphone BM1 and the second microphone BM2 receives is exported by the dual track composite signal output of frequency modulation integrated chip IC after amplifying mixing.
Claims (1)
1. a notebook computer microphone circuit, it is characterized in that: comprise battery, single-pole double-throw switch (SPDT), first microphone, second microphone, first inductance coil, second inductance coil, first electric capacity is to the 11 electric capacity, first resistance is to the 5th resistance, diode, light-emitting diode, paster triode, antenna and model are the frequency modulation integrated chip of BA1404, the positive pole of described battery is connected with the first end of described single-pole double-throw switch (SPDT) simultaneously, second end of described single-pole double-throw switch (SPDT) simultaneously with the first end of described 4th resistance, the first end of described second inductance coil, the first end of described tenth electric capacity is connected with the first end of described 3rd resistance, the control end of described single-pole double-throw switch (SPDT) connects the negative pole of described diode, the positive pole of described diode connects the collector electrode of described paster triode, the base stage of described paster triode connects the first end of described 11 electric capacity, second end of described 11 electric capacity simultaneously with the first end of described tenth electric capacity, the first end of described second inductance coil, the radio frequency amplifier output of described frequency modulation integrated chip is connected with the first end of described 8th electric capacity, second end of described 4th resistance connects the positive pole of described light-emitting diode, second end of described 8th electric capacity is connected with the first strength network terminal of described frequency modulation integrated chip and the first end of described 9th electric capacity simultaneously, second end of described 9th electric capacity simultaneously with the second strength network terminal of described frequency modulation integrated chip, the first end of described 6th electric capacity is connected with the first end of described first inductance coil, second end of described first inductance coil simultaneously with the second end of described 6th electric capacity, second end of described 3rd resistance, the cathode voltage input of described frequency modulation integrated chip, the first end of described 4th electric capacity, the first end of described 3rd electric capacity, second end of described second resistance is connected with the first end of described second microphone, the modulation signal input of described frequency modulation integrated chip is connected with the first end of the 5th resistance and the first end of described 5th electric capacity simultaneously, second end of described 5th electric capacity connects described antenna, second end of described 5th resistance connects the dual track composite signal output connection of described frequency modulation integrated chip, the left audio input of described frequency modulation integrated chip connects the first end of described second electric capacity, second end of described second electric capacity is connected with the second end of described second microphone and the first end of described first resistance simultaneously, the right audio channel input of described frequency modulation integrated chip connects the first end of described first electric capacity, second end of described first electric capacity is connected with the second end of described second resistance and the first end of described first microphone simultaneously, the audio frequency amplifier offset side of described frequency modulation integrated chip connects the first end of described 7th electric capacity, second end of described first microphone simultaneously with the second end of described first resistance, the emitter-base bandgap grading of described paster triode, the negative pole of described battery, second end of described 3rd electric capacity, second end of described 4th electric capacity, second end of described 7th electric capacity, the audio frequency amplifier earth terminal of described frequency modulation integrated chip, the radio frequency amplifier earth terminal of described frequency modulation integrated chip and the minus earth of described light-emitting diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410619262.6A CN104284277A (en) | 2014-11-05 | 2014-11-05 | Microphone circuit for laptop |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410619262.6A CN104284277A (en) | 2014-11-05 | 2014-11-05 | Microphone circuit for laptop |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104284277A true CN104284277A (en) | 2015-01-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410619262.6A Pending CN104284277A (en) | 2014-11-05 | 2014-11-05 | Microphone circuit for laptop |
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| CN (1) | CN104284277A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1053722A (en) * | 1990-01-17 | 1991-08-07 | 德鲁默集团公司 | Interrelational audio kinetic entertainment system |
| CN2199645Y (en) * | 1994-06-18 | 1995-05-31 | 陆荣臻 | Multifunctional tourist explaining apparatus |
| CN2402079Y (en) * | 1999-12-02 | 2000-10-18 | 刘正东 | RAdio accompanying sound remote controller |
| US6198825B1 (en) * | 1996-04-15 | 2001-03-06 | Narian Daryanani | Wireless speaker circuit |
| US20030028379A1 (en) * | 2001-08-03 | 2003-02-06 | Wendt David M. | System for converting electronic content to a transmittable signal and transmitting the resulting signal |
| CN201188691Y (en) * | 2008-03-31 | 2009-01-28 | 熊猫电子集团有限公司 | Frequency-modulation stereo wireless translator for automobile |
-
2014
- 2014-11-05 CN CN201410619262.6A patent/CN104284277A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1053722A (en) * | 1990-01-17 | 1991-08-07 | 德鲁默集团公司 | Interrelational audio kinetic entertainment system |
| CN2199645Y (en) * | 1994-06-18 | 1995-05-31 | 陆荣臻 | Multifunctional tourist explaining apparatus |
| US6198825B1 (en) * | 1996-04-15 | 2001-03-06 | Narian Daryanani | Wireless speaker circuit |
| CN2402079Y (en) * | 1999-12-02 | 2000-10-18 | 刘正东 | RAdio accompanying sound remote controller |
| US20030028379A1 (en) * | 2001-08-03 | 2003-02-06 | Wendt David M. | System for converting electronic content to a transmittable signal and transmitting the resulting signal |
| CN201188691Y (en) * | 2008-03-31 | 2009-01-28 | 熊猫电子集团有限公司 | Frequency-modulation stereo wireless translator for automobile |
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Application publication date: 20150114 |
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