CN1826018A - Microphone circuit and hand-held microphone comprising same - Google Patents
Microphone circuit and hand-held microphone comprising same Download PDFInfo
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- CN1826018A CN1826018A CN 200510063250 CN200510063250A CN1826018A CN 1826018 A CN1826018 A CN 1826018A CN 200510063250 CN200510063250 CN 200510063250 CN 200510063250 A CN200510063250 A CN 200510063250A CN 1826018 A CN1826018 A CN 1826018A
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Abstract
The invention sets delay circuit part between battery and FET, to switch the capacitor microphone to connect/cutoff state, to avoid the sound caused by broken circuit current or instant current; uses transistor to cutoff circuit; therefore, when the microphone is in closed state, it can broke the current fully; at the invention mounts other elements of microphone circuit as battery, to reduce the element number of microphone, to simplify the production process, and improve the interchangeability with dynamic microphone.
Description
Technical field
The handheld microphone that the present invention relates to a kind of microphone circuit and comprise this circuit, especially " noise made in coughing or vomiting warbling of the oriole " sound that inrush current in the time of can avoiding the opening and closing microphone or breaking current cause, and when keeping closed condition, microphone do not have an electric current, reduce the component number amount simultaneously as far as possible, simplify the production and the assembling procedure of microphone, and improve the microphone circuit of the interchangeability between the hand-held dynamic type microphone (DynamicHandy Microphone) and the handheld microphone that use comprises this microphone circuit.
Background technology
Existing microphone has dynamic type microphone and Electret Condencer Microphone (CondenserMicrophone).Produce the principle of electromotive force (electromotive force) when above-mentioned dynamic type microphone utilizes conductor to move in magnetic field, can be divided into belt microphone and dynamic microphones according to conductor shape.The former be aluminium matter band along with sound wave shakes in magnetic field, and the latter is attached to coil on the duralumin matter jolting plate, and coil is shaken in magnetic field.
Existing Electret Condencer Microphone structure as shown in Figure 1 and Figure 2 is, be used for the connecting plate 108 that is connected with battery 107, be installed in the top of microphone handle portion 109 inner spaces, with not shown outside the interface 112 that is connected of line be installed in the below of microphone handle portion 109 inner spaces.
Above-mentioned connecting plate 108 is connected on the one-time electrode of matching transformer (Matching Trans) 111, and a second electrode of matching transformer 111 that connects another one-time electrode of above-mentioned matching transformer 111 is connected on the electrode of interface 112.Another second electrode of matching transformer 111 is connected on another electrode of interface 112 in addition.Be provided with mains switch 110 between each second electrode of matching transformer 111 in addition, this mains switch 110 comes the opening and closing microphone circuit by displacement.Matching transformer 111 is located at microphone handle portion inside, and mains switch 110 is combined in microphone handle portion 109, and its part is exposed externally.
Be used for providing the battery 107 of power supply to be housed in battery case 106 to above-mentioned microphone circuit, battery case 106 combines by screwing togather with microphone handle portion 109 inner spaces that are provided with connecting plate 108.In addition, field-effect transistor) 104, (Printed Circuit Board: printed circuit board (PCB)) microphone circuit of formations such as 105 is housed in the microphone circuit box 102 PCB, and microphone circuit box 102 is combined in battery case 106 the place aheads by screw-in version by capacitance microphone unit 103 and FET (Field Effect Transistor:.And in order to protect the microphone inner body with microphone handle portion 102,109 the place ahead screw-in version are installed netted Mike's fan housing 101 in microphone handle portion.
The shortcoming of above-mentioned existing Electret Condencer Microphone is, even mains switch switches to off-state, its battery current does not disconnect fully, so unnecessary power consumption is a lot.And, mains switch is switched to off-state from on-state, or when on-state switches to off-state, breaking current or inrush current take place, thereby produce " noise made in coughing or vomiting warbling of the oriole " sound, bring no small trouble to the user.In addition, according to the characteristic of microphone unit, need the exchange matching transformer.The Electret Condencer Microphone structure is more complicated also, and production and assembly are time-consuming, take material, thereby causes cost to increase.
Summary of the invention
The object of the present invention is to provide a kind of microphone circuit, can prevent to switch to off-state from on-state when Electret Condencer Microphone, or when on-state switches to off-state, " noise made in coughing or vomiting warbling of the oriole " sound that causes by breaking current or inrush current; When mains switch is kept closed condition, disconnect battery current fully, thus amount capable of reducing power consumption.
Another object of the present invention is for providing a kind of handheld microphone, and it reduces microphone part number as far as possible, simplifies the production and assembly operation, can reduce cost, and comprise can improve and the dynamic type microphone between the microphone circuit of interchangeability.
According to microphone circuit of the present invention, its feature comprises: battery; Mains switch is controlled from above-mentioned battery to FET (Field Effect Transistor: the power supply that field-effect transistor) provides; Delay circuit portion, switch to the moment of on-state when above-mentioned mains switch, the inrush current (Inrush current) that above-mentioned battery is flow to the source electrode of above-mentioned FET postpones certain hour, and work as the moment that above-mentioned mains switch switches to off-state, the breaking current (Breaking current) that will flow to output from the drain electrode of above-mentioned FET postpones certain hour; FET the potential difference that above-mentioned battery generated that provides by above-mentioned delay circuit is carried out amplification, and its potential difference is corresponding to the variation of two electrode spacings in the microphone unit.
In addition, in the present invention, above-mentioned delay circuit portion preferably, the negative pole of above-mentioned battery is connected the neutrality end of mains switch, the connection end of above-mentioned mains switch is connected the drain electrode of FET and an electrode of microphone unit by the 2nd electric capacity (Capacitor), be connected the base stage of triode simultaneously by the 1st electric capacity, and the positive pole of above-mentioned battery is connected the collector electrode of triode and is connected the base stage of triode by resistance, the emitter of above-mentioned triode is connected the source electrode of above-mentioned FET.
In addition, in the present invention, above-mentioned delay circuit portion preferably includes voltage regulator, reduces voltage according to the characteristic of above-mentioned microphone unit, to keep certain sensitivity.
In addition, according to handheld microphone of the present invention, its mains switch exposes a part in microphone handle portion side, above-mentioned microphone handle portion the place ahead is provided with the Mike's fan housing that is used to protect inner components, and comprise microphone circuit, above-mentioned handheld microphone is characterized in that, is provided with the Electret Condencer Microphone assembly (Condenser Microphone Pack) that its place ahead is equipped with the microphone circuit box in the above-mentioned microphone handle portion; In the above-mentioned microphone handle portion printed circuit board (PCB) (Printed Circuit Board) that comprises microphone unit and FET is installed, in the above-mentioned Electret Condencer Microphone component internal space battery is installed and is connected to the exposing on nose end of above-mentioned printed circuit board (PCB), and be connected by connecting plate on the neutrality end of mains switch.
In addition, preferably, above-mentioned Electret Condencer Microphone assembly outside is provided with flange among the present invention, and above-mentioned microphone handle portion inner space is provided with and the pairing support portion of above-mentioned flange.In addition, in the present invention, above-mentioned microphone handle portion and above-mentioned Electret Condencer Microphone assembly be by the bolt combination, or be combined into one by rubber packing.
Among the present invention, in order to eliminate interfering noise (Noise Hum), the material of above-mentioned rubber packing is conducting rubber preferably.
Above-mentioned microphone circuit in the present invention's handheld microphone preferably includes: battery; Mains switch, the power supply that opening and closing provide to FET from above-mentioned battery; Delay circuit portion, switch to the moment of on-state when above-mentioned mains switch, the inrush current that above-mentioned battery is flow to the source electrode of above-mentioned FET postpones certain hour, and work as the moment that above-mentioned mains switch switches to off-state, the breaking current that will flow to output from the drain electrode of above-mentioned FET postpones certain hour; FET the potential difference that above-mentioned battery generated that provides by above-mentioned delay circuit is carried out amplification, and its potential difference is corresponding to the variation of two electrode spacings in the microphone unit.
In addition, in the present invention's the handheld microphone, above-mentioned delay circuit portion preferably, the negative pole of above-mentioned battery is connected the neutrality end of mains switch, the connection end of above-mentioned mains switch is connected the drain electrode of FET and an electrode of microphone unit by the 2nd electric capacity, be connected the base stage of triode simultaneously by the 1st electric capacity, and the positive pole of above-mentioned battery is connected the collector electrode of triode and is connected the base stage of triode by resistance, the emitter of above-mentioned triode is connected the source electrode of above-mentioned FET.
In addition, in the present invention's handheld microphone, above-mentioned delay circuit portion preferably includes voltage regulator, and reduces voltage according to the characteristic of above-mentioned microphone unit, to keep certain sensitivity.
Electret Condencer Microphone among the present invention switches to off-state from on-state, or when off-state switches to on-state, can prevent " noise made in coughing or vomiting warbling of the oriole " sound that is caused by breaking current or inrush current; When mains switch is kept closed condition, disconnect battery current fully, thus amount capable of reducing power consumption.
In addition, the present invention reduces microphone part number as far as possible, simplifies the production and assembly operation, can reduce cost, and comprise can improve and the dynamic type microphone between the microphone circuit of interchangeability.
Description of drawings
Fig. 1 is the structural representation of existing hand-held Electret Condencer Microphone;
Fig. 2 is the Electret Condencer Microphone circuit diagram in the handheld microphone of Fig. 1;
Fig. 3, Fig. 4 are the handheld microphone structural representation that the Electret Condencer Microphone circuit is installed among the present invention;
Fig. 5 is the Electret Condencer Microphone circuit diagram in the handheld microphone of Fig. 3 and Fig. 4.
The reference numeral explanation:
1: Mike's fan housing 2: microphone circuit portion
3: microphone circuit support 4: printed circuit board (PCB)
5: microphone unit 6: the Electret Condencer Microphone assembly
7: battery 8a, 8b: top cover
9: connecting plate 10: flange
11: mains switch 12: microphone handle portion
13: interface 14: support portion
15: delay circuit portion 16: rubber packing
C1～C3: electric capacity VR: voltage regulator
R1, R2: resistance TR: triode
Embodiment
Below, the present invention is described in detail.
Fig. 3, Fig. 4 are the handheld microphone schematic diagram that the Electret Condencer Microphone circuit is installed among the present invention, and microphone handle portion 12 is the different tapered cylinder shape of two ends diameter, in the inner space that its length direction is opened various parts are installed.12 1 end outer surfaces are formed with the screw thread that screws togather usefulness with Mike's fan housing 1 in microphone handle portion.
In addition, battery 7 to the microphone circuit power supply is controlled by mains switch 11, the part of its mains switch 11 is exposed outside microphone handle portion 12, and in order to carry out wired connection with not shown audio-visual devices, the end in microphone handle portion 12 inner spaces is provided with interface 13.
In addition, when Electret Condencer Microphone assembly 6 is combined in microphone handle portion 12 inside, in order to stop that Electret Condencer Microphone assembly 6 too enters microphone handle portion inside, be formed with flange 10 at Electret Condencer Microphone assembly 6 outer surfaces, and the support portion 14 that contacts with flange 10 is formed on microphone handle portion 12 inner spaces and perpendicular to length direction.
In addition, in order to protect the various parts that comprise Electret Condencer Microphone assembly 6 of microphone handle portion inside, be provided with the Mike's fan housing 1 that forms by net or sea in microphone handle portion 12 the place aheads.As mentioned above, screw togather in order to form with microphone handle portion 12, with Mike's fan housing 1 that microphone handle portion 12 directly contacts in perimeter surface be formed with screw thread.
Above-mentioned microphone handle portion is provided with the Electret Condencer Microphone assembly 6 that its place ahead is equipped with microphone circuit box 3 in 12 inner spaces; At the microphone circuit box 3 inner printed circuit board (PCB)s 4 that form microphone circuit 2 of installing, microphone circuit 2 comprises microphone unit 5 and FET, in Electret Condencer Microphone assembly 6 inner spaces battery 7 is installed.For with above-mentioned Electret Condencer Microphone assembly 6 in battery 7 form and electrically contact, connecting plate 9 is installed in Electret Condencer Microphone assembly 6 inner spaces and forms with mains switch 11 and is connected.
Above-mentioned connecting plate 9 comprises printed circuit board (PCB), and the face that contacts with battery 7 is provided with the spring that is used to electrically contact, and another side is provided with a part of microphone circuit and forms and is electrically connected.
In addition, break away from mutually in order to prevent the battery 7 and the connecting plate 9 that are installed in the Electret Condencer Microphone assembly 6, at Electret Condencer Microphone assembly 6 one end top cover 8a.For the microphone unit 5 that prevents to be contained in the microphone circuit box 3 breaks away from, can top cover 8b also be set in addition at microphone circuit box 3 one ends.
Here, separate with top cover 8a, 8b with microphone circuit box 3, be provided with screw thread, and top cover 8a, 8b inner surface also are formed with the screw thread corresponding with it in microphone handle portion 12 and microphone circuit box 3 end outer surface for the ease of making microphone handle portion 12.
Like this, be installed in the transistor collector of battery 7 contacts on printed circuit board (PCB) 4 in the Electret Condencer Microphone assembly 6, be connected on the neutrality end of mains switch 11 by connecting plate 9 simultaneously.
Electret Condencer Microphone assembly 6 combinations that are installed in the inner space of microphone handle portion 12 can be, screw togather by the threaded portion that is formed on the threaded portions in the microphone handle portion 12 and is formed on Electret Condencer Microphone assembly 6 outer surfaces and to be integral, perhaps insert rubber packing 16 between microphone handle portion 12 and the Electret Condencer Microphone assembly 6 and be combined into one.Electret Condencer Microphone assembly 6 when like this, being subjected to external impact in the microphone handle portion 12 keeps motionless.
In addition, the optional conducting rubber of the material of rubber packing 16 is to eliminate interfering noise.
Fig. 5 is the microphone unit 5 in the above-mentioned microphone circuit box 3 and the schematic diagram of the Electret Condencer Microphone circuit 2 on the printed circuit board (PCB) 4, when from the outside when microphone unit 5 applies acoustic pressure, produce potential difference according to variable in distance between two electrodes of microphone unit 5 inside, above-mentioned microphone circuit 2 is positioned at Mike's fan housing 1, above-mentioned potential difference is carried out amplification handle.
As shown in Figure 5, above-mentioned microphone circuit 2 comprises: battery 7; Mains switch 11, the power supply that opening and closing provide to FET from battery 7; Delay circuit portion 15, switch to the moment of on-state when above-mentioned mains switch 11, to flow to the inrush current delay certain hour of the source electrode of above-mentioned FET from above-mentioned battery 7, and work as the moment that above-mentioned mains switch 11 switches to off-state, the breaking current that will flow to output from the drain electrode of above-mentioned FET postpones certain hour; FET the potential difference that the above-mentioned battery 7 that provides by delay circuit portion 15 is generated is carried out amplification, and its potential difference is corresponding to the variation of two electrode spacings in the microphone unit 5.
The annexation that comprises the microphone circuit 2 of above-mentioned delay circuit portion 15 is described as follows.
At first, the negative pole of battery 7 is connected the neutrality end of mains switch 11, and the positive pole of battery 7 directly is connected exposing on nose end of triode TR, is connected on the base stage by resistance R 1 simultaneously.
The neutrality end of above-mentioned mains switch 11 is connected to a terminal and the voltage regulator VR that output is an interface 13 by resistance R 2, voltage regulator VR is connected another terminal and the drain electrode of FET and the electrode in the microphone unit 5 that output is an interface 13, is connected triode TR base stage by capacitor C 1 simultaneously.
In addition, the emitter of triode TR is connected the source electrode of FET, and the door of FET (Gate) electrode is connected on another electrode in the microphone unit 5.
Be connected output and be the voltage regulator VR between each terminal of interface 13, reduce voltage according to the characteristic of microphone unit, to keep certain sensitivity.By the change in voltage of voltage regulator VR, can make the sensitivity of microphone unit 5 keep proper level, and need not exchange or increase other parts.
Unaccounted C3 is among the figure, stops the blocking-up direct current electric capacity to output output DC stream.
Delay circuit among the present invention is that example is illustrated with Fig. 5, but the present invention is not limited thereto example, as long as when mains switch disconnects, can cut off the electricity supply fully, and mains switch is switched to inrush current or the breaking current that moment of the state of opening or closing takes place charge, can prevent from the noise that causes by inrush current or breaking current from can the present invention be carried out various changes.
According to mains switch 11 states, the running of above-mentioned microphone circuit 2 is as follows.
At first, when mains switch 11 switched to on-state, battery 7 power supplys applied high level by capacitor C 1, C2 to the base stage of triode TR, triode TR conducting simultaneously, thus apply battery 7 power supplys to source electrode and the drain electrode of FET.
Here, switch to the initial stage of on-state when mains switch 11, battery 7 power supplys do not apply high level to the base stage of triode TR immediately, apply high level to triode TR base stage but delay time again after capacitor C 1 charging is finished, and so just the noise that inrush current causes can not take place.
In addition, when the mains switch 11 that will be in on-state switched to off-state, the power supply that is applied to FET drain electrode and microphone unit 5 electrodes was disconnected and breaking current takes place.But this breaking current charges to capacitor C 2, and therefore discharge slowly the noise that breaking current causes can not take place then.
Especially, when mains switch 11 was switched to off-state, triode TR kept closed condition, and like this, battery 7 power supplys cut off the electric current that flows to FET or microphone unit 5 fully, thereby can avoid unnecessary power consumption.
More than, the present invention's specific embodiment is had been described in detail, still, the present invention not merely is defined in the foregoing description, and the those skilled in the art can carry out various distortion and change to it in technological thought scope of the present invention.
Claims (10)
1, a kind of microphone circuit, its feature comprises:
Battery;
The power supply that provides to FET from above-mentioned battery is provided mains switch;
Delay circuit portion, switch to the moment of on-state when above-mentioned mains switch, to flow to the inrush current delay certain hour of the source electrode of above-mentioned FET from above-mentioned battery, and work as the moment that above-mentioned mains switch switches to off-state, the breaking current that will flow to output from the drain electrode of above-mentioned FET postpones certain hour; And
FET the potential difference that above-mentioned battery generated that provides by above-mentioned delay circuit is carried out amplification, and its potential difference is corresponding to the variation of two electrode spacings in the microphone unit.
2, microphone circuit as claimed in claim 1 is characterized in that:
In the above-mentioned delay circuit portion, the negative pole of above-mentioned battery is connected the neutrality end of mains switch, and the connection end of above-mentioned mains switch is connected the drain electrode of FET and the electrode in the microphone unit by the 2nd electric capacity, is connected the base stage of triode simultaneously by the 1st electric capacity;
The positive pole of above-mentioned battery is connected the collector electrode of triode and is connected the base stage of triode by resistance, and the emitter of above-mentioned triode is connected the source electrode of above-mentioned FET.
3, microphone circuit as claimed in claim 1 or 2 is characterized in that:
Above-mentioned delay circuit portion also comprises voltage regulator, and its characteristic according to above-mentioned microphone unit reduces voltage, to keep certain sensitivity.
4, a kind of handheld microphone that comprises microphone circuit; its mains switch exposes a part in the side of microphone handle portion; above-mentioned microphone handle portion the place ahead is provided with the Mike's fan housing that is used to protect inner components, and comprises microphone circuit, and described handheld microphone is characterised in that:
Be provided with the Electret Condencer Microphone assembly that the top is equipped with the microphone circuit board mount in the above-mentioned microphone handle portion;
In the above-mentioned microphone handle portion printed circuit board (PCB) that comprises microphone unit and FET is installed,
Above-mentioned Electret Condencer Microphone component internal is equipped with battery in the space, and this battery is connected on the transistor collector of above-mentioned printed circuit board (PCB), and is connected by connecting plate on the neutrality end of mains switch.
5, the handheld microphone that comprises microphone circuit as claimed in claim 4 is characterized in that:
Above-mentioned Electret Condencer Microphone module outer surface is provided with flange, and above-mentioned microphone handle portion inner space is provided with and the corresponding support portion of above-mentioned flange.
6, as comprising the handheld microphone of microphone circuit as described in the claim 4, it is characterized in that:
Above-mentioned microphone handle portion and above-mentioned Electret Condencer Microphone assembly with the mode that screws togather in conjunction with or be combined into one by rubber packing.
7, as comprising the handheld microphone of microphone circuit as described in the claim 6, it is characterized in that:
The material of above-mentioned rubber packing is conductive conducting rubber, to eliminate interfering noise.
8, the handheld microphone that comprises microphone circuit as claimed in claim 4 is characterized in that, above-mentioned microphone circuit comprises:
Battery;
The power supply that provides to FET from above-mentioned battery is provided mains switch;
Delay circuit portion, switch to the moment of on-state when above-mentioned mains switch, to flow to the inrush current delay certain hour of the source electrode of above-mentioned FET from above-mentioned battery, and work as the moment that above-mentioned mains switch switches to off-state, the breaking current that will flow to output from the drain electrode of above-mentioned FET postpones certain hour; And
FET the potential difference that above-mentioned battery generated that provides by above-mentioned delay circuit is carried out amplification, and its potential difference is corresponding to the variation of two electrode spacings in the microphone unit.
9, as comprising the handheld microphone of microphone circuit as described in the claim 8, it is characterized in that:
In the above-mentioned delay circuit portion,
The negative pole of above-mentioned battery is connected the neutrality end of mains switch, and the connection end of above-mentioned mains switch is connected the drain electrode of FET and the electrode in the microphone unit by the 2nd electric capacity, is connected the base stage of triode simultaneously by the 1st electric capacity;
The positive pole of above-mentioned battery is connected the collector electrode of triode and is connected the base stage of triode by resistance, and the emitter of above-mentioned triode is connected the source electrode of above-mentioned FET.
10, as comprising the handheld microphone of microphone circuit as described in claim 8 or 9, it is characterized in that:
Above-mentioned delay circuit portion also comprises voltage regulator, and its characteristic according to above-mentioned microphone unit reduces voltage, to keep certain sensitivity.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020050015256 | 2005-02-24 | ||
| KR20050015256 | 2005-02-24 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1826018A true CN1826018A (en) | 2006-08-30 |
Family
ID=36936383
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200510063250 Pending CN1826018A (en) | 2005-02-24 | 2005-04-07 | Microphone circuit and hand-held microphone comprising same |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1826018A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102111704A (en) * | 2009-12-24 | 2011-06-29 | 谢小明 | Novel structured capacitance type microphone by virtue of utilizing semiconductor impedance conversion and signal amplifier body to replace printed circuit board (PCB) |
| CN102301740A (en) * | 2009-02-06 | 2011-12-28 | 松下电器产业株式会社 | Microphone device |
-
2005
- 2005-04-07 CN CN 200510063250 patent/CN1826018A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102301740A (en) * | 2009-02-06 | 2011-12-28 | 松下电器产业株式会社 | Microphone device |
| CN102301740B (en) * | 2009-02-06 | 2014-03-12 | 松下电器产业株式会社 | Microphone device |
| US8744097B2 (en) | 2009-02-06 | 2014-06-03 | Panasonic Corporation | Microphone device |
| CN102111704A (en) * | 2009-12-24 | 2011-06-29 | 谢小明 | Novel structured capacitance type microphone by virtue of utilizing semiconductor impedance conversion and signal amplifier body to replace printed circuit board (PCB) |
| CN102111704B (en) * | 2009-12-24 | 2013-06-05 | 谢小明 | Capacitance type microphone |
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| WD01 | Invention patent application deemed withdrawn after publication |
Open date: 20060830 |