CN2476911Y - Impedance converter for electronic-type capacity microphone - Google Patents
Impedance converter for electronic-type capacity microphone Download PDFInfo
- Publication number
- CN2476911Y CN2476911Y CN 01218819 CN01218819U CN2476911Y CN 2476911 Y CN2476911 Y CN 2476911Y CN 01218819 CN01218819 CN 01218819 CN 01218819 U CN01218819 U CN 01218819U CN 2476911 Y CN2476911 Y CN 2476911Y
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- microphone
- impedance transducer
- utility
- model
- effect transistor
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- Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)
Abstract
The utility model relates to an electronic impedance convertor. The utility model comprises a transistor, a connecting valve, a resistance in the end of the power and a pair of filter which is connected in the end of the transistor; as the impedance convertor has the filtering function, the utility model can be connected with an inducing unit; the utility model not only can filter the impurity information received by the inducing unit to get a better radio quality, but also can make the impedance convertor with the same chip; therefore the utility model can make the capacitor type microphone reach a widely applying and reach the aim of easy to be carried out.
Description
The utility model relates to a kind of loud speaker, refers to a kind of tool smaller size smaller especially, and is installed in the Electret Condencer Microphone, can make it reach the impedance transducer of the electronic type capacitance microphone that improves the radio reception quality.
Press, under the variation that science and technology is maked rapid progress, electronic product miscellaneous will reach skilful more little volume at present, to improve consumer's purchase interest, wherein can be changed to peep by the device of general use record, cassette player or radio reception signal and know one, two.Because of usually utilizing microphone, people cooperate public address set to use to enlarge volume in many people occasion, or utilize this microphone that sound is stored in other devices, as the means of reviewing again in the future, in order this type of device to be become carry easily and to use, so the trend of miniaturization has been more and more obvious.
Yet, in various microphone, especially the smallest and the most exquisite with Electret Condencer Microphone, little because of its shared volume, so can simplify the design that functional circuit reaches the miniaturization audio signal reception device, and this Electret Condencer Microphone can be complied with different user modes, distinguish the microphone of various functions, omnidirectional, unidirectivity are promptly arranged, closely say the Electret Condencer Microphone of formula etc., wherein the primary structure of this microphone sees also shown in Figure 3ly, includes:
One sensing unit (60) changes into voltage signal after can receiving the sound sound wave;
One impedance transducer (50) is the output that is connected to this sensing unit (60);
After above-mentioned this sensing unit (60) receives this sound wave, promptly improve the power of this signal, make the preferable signal of Electret Condencer Microphone output by this impedance transducer (50).Because this sensing unit (60) is comparatively sensitive, thus influence of the noise around can being subjected to and generation noise, so the dealer promptly connects a noise filter unit (70) at the output of this impedance transducer (50), with the noise of this microphone of filtering.Yet the noise filter unit (70) of making above-mentioned Electret Condencer Microphone at present is still the plug-in filter capacitor of ic output at this impedance transducer (50), and reaching the purpose of filtering, yet this fabrication schedule but brings following shortcoming:
1. volume can't dwindle again: because of this microphone circuit because of number of elements many (as electric capacity, impedance transducers etc.), so can't will put in order volume miniaturization again.
2. the scope of application is little: use too much because of being subject to necessary element, so can't reduce volume, relatively limited the applicable scope of this microphone.
3. during production costs: because circuit element quantity is many, when making this structure and promptly spending expenses of labour.
For this reason, the utility model main purpose is, provide a kind of and reach better radio reception quality with smaller size smaller, and the impedance transducer that the Electret Condencer Microphone manufacturing is implemented.
Desiring to reach the employed major technique means of above-mentioned purpose is to make above-mentioned impedance transducer be connected in the output of a sensing unit, and it includes:
A kind of impedance transducer of electronic type capacitance microphone is characterized in that, comprising:
One field-effect transistor (FET);
One resistance is between the lock that is connected in this field-effect transistor, source electrode;
One filter unit, its two ends are to be connected to the drawing of this field-effect transistor, source electrode respectively.
The purpose of this utility model can also further realize by following technical measures.
The impedance transducer of aforementioned electric minor capacitance microphone, wherein this filter unit is two shunt capacitances.
The impedance transducer of aforementioned electric minor capacitance microphone, this resistance diode in parallel wherein, the anode of this diode is connected with the source electrode of described field-effect transistor, and its negative electrode is connected with the gate of this field-effect transistor.
The impedance transducer of aforementioned electric minor capacitance microphone, wherein this impedance transducer can be implemented in a wafer.
Said structure is about to this filter and this impedance transducer is implemented in same wafer, can make this wafer have impedance transformation and filter function simultaneously, not only the signal that this sensing unit can be received improves power output, also can obtain the output signal of low noise, this integrated circuit use is made in Electret Condencer Microphone, can dwindle the volume of this microphone effectively, shortcoming such as in the time of also can saving miscellaneous step of making and long worker.
For further understanding technology contents of the present utility model, characteristics and effect, exemplify following preferred embodiment now, and conjunction with figs. is described in detail as follows:
Fig. 1 is an enforcement circuit diagram of the present utility model.
Fig. 2 is a practical operation block schematic diagram of the present utility model.
Fig. 3 is a block schematic diagram of commonly using Electret Condencer Microphone.
The utility model is a kind of Electret Condencer Microphone that is implemented on easily, has the impedance transducer of filter function simultaneously, sees also shown in Figure 1ly, and this impedance transducer (11) includes:
One field-effect transistor Q1;
One resistance R 1 is connected between the lock, source electrode of this field-effect transistor Q1;
One filter unit (110) is two shunt capacitance C1, C2, and wherein the two ends of capacitor C 1, C2 are connected with the drawing of this field-effect transistor Q1, source electrode respectively, and shunt capacitance C1, C2 two ends in addition are A, B end.
Foregoing circuit is to make the gate of this field-effect transistor Q1 can directly electric current not imported source electrode, connect a contrary diode D1 partially between former lock, source electrode in this field-effect transistor Q1, wherein should be connected with the gate of this field-effect transistor Q1 by the contrary negative electrode of diode D1 partially, its anode is connected with the source electrode of this field-effect transistor Q1.
Be the enforcement circuit diagram of this impedance transducer (11) as shown in Figure 2, wherein this impedance transducer (11) input C is connected in the output of a sensing unit (10), after this sensing unit (10) receives sound signal, promptly reach impedance matching by this impedance transducer (11), to improve the effect of power output, this impedance transducer (11) is to have filter function again, so can be with receiving the noise filtering of sound wave, to keep sound signal clearly.
From the above, set impedance transducer can make microphone have following every advantage to the utility model in the microphone because of having improved:
1. radio reception quality is good: promptly utilize the noise filtering of filter unit with sound signal.
2. long-pending body is little: because of the impedance transducer and the filter unit of this microphone can be implemented to make in semiconductor wafer, so can dwindle the volume of microphone effectively.
3. make easily,,, can reduce the design of circuit-line, the making element is reduced also implement easily so need not external filter circuit on circuit board because of this impedance transducer has filter function.
For this reason, the Electret Condencer Microphone of this creation is not only commonly used on structural design preferable, and has obvious effect, meets the value on the industry really, and meet the novel novelty of patent of application, creativeness, practicality patent requirement, so file an application in accordance with the law.
Claims (4)
1, a kind of impedance transducer of electronic type capacitance microphone is characterized in that, comprising:
One transistor is field-effect transistor;
One resistance is between the lock that is connected in this field-effect transistor, source electrode;
One filter unit, its two ends are to be connected to the drawing of this field-effect transistor, source electrode respectively.
According to the impedance transducer of the described electronic type capacitance microphone of claim 1, it is characterized in that 2, described filter unit is two shunt capacitances.
3, according to the impedance transducer of claim 1 or 2 described electronic type capacitance microphones, it is characterized in that, a described resistance diode in parallel again, the anode of this diode is connected with the source electrode of described field-effect transistor, and its negative electrode is connected with the gate of this field-effect transistor.
According to the impedance transducer of the described electronic type capacitance microphone of claim 3, it is characterized in that 4, described impedance transducer can be implemented in a wafer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01218819 CN2476911Y (en) | 2001-04-05 | 2001-04-05 | Impedance converter for electronic-type capacity microphone |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01218819 CN2476911Y (en) | 2001-04-05 | 2001-04-05 | Impedance converter for electronic-type capacity microphone |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2476911Y true CN2476911Y (en) | 2002-02-13 |
Family
ID=33636773
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 01218819 Expired - Fee Related CN2476911Y (en) | 2001-04-05 | 2001-04-05 | Impedance converter for electronic-type capacity microphone |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2476911Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100425102C (en) * | 2003-03-20 | 2008-10-08 | 宝星电子株式会社 | Condenser microphone employing wide band stop filter and having improved resistance to electrostatic discharge |
-
2001
- 2001-04-05 CN CN 01218819 patent/CN2476911Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100425102C (en) * | 2003-03-20 | 2008-10-08 | 宝星电子株式会社 | Condenser microphone employing wide band stop filter and having improved resistance to electrostatic discharge |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20020213 Termination date: 20100405 |