EP1585365B1 - Einstellung der Polarisationsspannung von Mikrofonen - Google Patents

Einstellung der Polarisationsspannung von Mikrofonen Download PDF

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Publication number
EP1585365B1
EP1585365B1 EP04450073A EP04450073A EP1585365B1 EP 1585365 B1 EP1585365 B1 EP 1585365B1 EP 04450073 A EP04450073 A EP 04450073A EP 04450073 A EP04450073 A EP 04450073A EP 1585365 B1 EP1585365 B1 EP 1585365B1
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EP
European Patent Office
Prior art keywords
voltage
microphone
control electronics
regulation loop
polarization voltage
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.)
Expired - Lifetime
Application number
EP04450073A
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English (en)
French (fr)
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EP1585365A1 (de
Inventor
Werner Lang
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AKG Acoustics GmbH
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AKG Acoustics GmbH
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Filing date
Publication date
Application filed by AKG Acoustics GmbH filed Critical AKG Acoustics GmbH
Priority to EP04450073A priority Critical patent/EP1585365B1/de
Priority to AT04450073T priority patent/ATE520263T1/de
Priority to CN200510002548.0A priority patent/CN1678134B/zh
Priority to JP2005013410A priority patent/JP4662782B2/ja
Priority to US11/093,762 priority patent/US7356151B2/en
Priority to US11/094,825 priority patent/US7835531B2/en
Priority to US11/094,805 priority patent/US7620189B2/en
Publication of EP1585365A1 publication Critical patent/EP1585365A1/de
Application granted granted Critical
Publication of EP1585365B1 publication Critical patent/EP1585365B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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

Definitions

  • the invention relates to a circuit for the compensation of the polarization voltage of capacitor microphones.
  • the power supply of microphones is conventionally provided by a power supply source, for example, using a mixer.
  • a power supply source for example, using a mixer.
  • the positive pole of the feed voltage is applied through two identical feeder resistances through two cable conductors of the audio cable.
  • the return of the current occurs through a third conductor connected to pin 1 of an XLR plug.
  • the current consumption of the microphone should be as small as possible to prevent an excessively large voltage drop at the feeder resistances.
  • the maximum current consumption with 48-V capacitor microphones is 10 mA.
  • the phantom power supply is here standardized according to DIN EN 61938 (formerly IEC 268).
  • the microphone membrane To generate the polarization voltage on the microphone membrane, whose value is usually in the range of 20-100 volts dc, one uses primarily combinatorial circuit parts or voltage converters.
  • the remaining microphone electronics are usually supplied with power by a linear regulation, which maintains either the supply feed voltage or the supply current at a predetermined value.
  • this type of power supply is appropriate.
  • the linear regulation becomes problematic when the power consumption in the microphone increases, for example, by the use of processors, A/D converters, LED displays, etc. In this case, a large portion of the energy that is made available by the phantom power supply is destroyed in the linear regulation elements.
  • the phantom power supply since, according to the standard, the phantom power supply is limited in its current by the feeder resistances, the maximum supply voltage for the audio amplifier immediately decreases due to the linear regulation in the microphone, which results in a reduction of the maximal audio output voltage of the microphone.
  • microphones there is an increasing need to be able to regulate or to change important microphone parameters via remote control. These parameters include the polarization voltage on the membrane and the associated sensitivity of the capacitor microphone, the directional characteristic of the microphone, the type of the phantom power supply (12 V, 24 V or 48 V), a series number, calibration data from the manufacturer, as well as a weakening of the signal and a connectable filter for the audio signal.
  • DE 3 933 870 A1 discloses a method for the remote control of microphone parameters, such as directional characteristic, step sound filter, or preliminary damping.
  • the supply voltage transferred to the cable conductor is regulated via a remote control unit, for example, in the mixing table, in such a manner that its amount represents control information for the microphone.
  • the supply voltage is uncoupled and applied to an evaluation circuit, which generates a control signal as a function of the amount of the supply voltage.
  • the polarization voltage is adjusted by a voltage regulation loop that is integrated in the microphone.
  • the desired value of the polarization voltage is preestablished in this circuit via a D/A converter by a control electronics.
  • the desired value of the polarization voltage can also be transmitted by remote control to the control electronics.
  • the tolerance of the obtained polarization voltage now depends on the tolerance and the thermal behavior of a reference voltage source.
  • the regulation of the polarization voltage via a digitally controlled regulation loop in the microphone allows a very precise, interference-resistant, and remote-controllable adjustment of the polarization voltage of capacitor microphones.
  • the remote-controllable adjustment of the polarization voltage has the advantage that readjustments by fixed resistances or trim resistances are no longer necessary; this fact has a positive effect with respect to cost.
  • the different microphone sensitivities can be compensated for and the required correction factors needed to compensate the polarization voltage can be stored.
  • the polarization voltage can be calibrated during an acoustical measurement with closed microphone, and correction factors can again be stored.
  • a capacitor microphone according to the invention allows an aging-caused recalibration of the microphone sensitivity, without having to disassemble the microphone, which again means a cost saving for the customer.
  • the original sensitivity of the microphone can thus be readjusted later, that is, after the incorporation, by remote control.
  • Fig. 1 is a block diagram that shows the principal components of a microphone according to the invention.
  • the phantom power supply of the microphone shown in Fig. 5 , is carried out by a phantom supply unit 31 through feeder resistances 32, 33 of identical magnitude, which are arranged behind the 3-pole plug 4, for example, an XLR plug, in or before the mixing table.
  • a phantom power supply is shown in Fig. 5 .
  • the associated values of the feeder resistances for a 12-V, 24-V, or 48-V supply are 680 ⁇ , 1.2 k ⁇ , or 6.8 k ⁇ , respectively.
  • the lines 1 and 2 here represent cable conductors supplied by the phantom supply unit; line 3 represents the ground line that is usually connected to the grounded cable shielding.
  • line 3 represents the ground line that is usually connected to the grounded cable shielding.
  • the resistances 5 and 6 are the feeder resistances in the microphone. They are used for decoupling the power supply of the microphone from the output of the audio amplifier 10.
  • the feeder resistances of the microphones 5 and 6 are assigned as additional internal resistances of the phantom power supply 31. Power adaptation exists when the internal resistance of the phantom power unit is identical to the internal resistance of the power supply circuit 11 in the microphone.
  • the power supply circuit 11 comprises a power source 13, a control unit 12, and a transformer 14 connected to the control unit 12.
  • the control unit 12 with the transformer 14 forms a circuit unit, where the DC voltage is converted into AC voltage.
  • the transformer is a part of the oscillation generating circuit.
  • alternating current can also be generated by the control unit 12 independently of the transformer.
  • the control unit 12 then consists of an oscillating circle that is independent of the transformer, and which generates alternating current.
  • the transformer only serves the function of converting the alternating current into the individual output voltages.
  • the AC signal has a frequency in the range of 100-130 kHz.
  • the AC signal can also be freely oscillating; this represents the simplest embodiment possibility for such a circuit.
  • the only important factor is that the frequency range of the AC signal must lie outside of the audio frequency range in order to not produce any interferences with the audio signal, which interferences cannot be eliminated by simple filtering.
  • the frequency should also not be too high, because otherwise the degree of efficiency of the circuit decreases and transmission interferences can be expected.
  • An additional advantage of using a frequency of 100-130 kHz is that this frequency can also be used as cycle pulse for a control electronics 39 that is provided in the microphone. As a result, the interfering signals generated by digital technology are minimized, because no additional mixed products are produced between the digital cycle time and the oscillation frequency of the DC/DC converter.
  • a constant-current generator 13 at the input of the DC/DC converter ensures a constant primary current uptake.
  • the constant-current generator 13, with respect to the phantom power unit 31, behaves like a constant-current sink and it represents a constant-current generator for the power supply circuit 11.
  • An electrical component of this type is very well known to a person skilled in the art who is familiar with the state of the art. Circuit examples for constant-current generators from the state of the art are shown in Figs. 3 and 4. Fig.
  • FIG. 3 shows a "transistor LED” constant-current generator with a bipolar transistor.
  • the LED With this current generator, the LED is operated in the flow direction. As a result, a constant voltage is applied to the LED, with such a voltage also being applied to the series connection of the base emitter diode of the transistor with the emitter resistance.
  • the circuit in Fig. 4 contains a constant-current generator with two counter coupled degenerated transistors 28, 29 with an additional integrated constant-current generator 30.
  • This circuit is preferred because of better properties in view of a constant-current and a higher starting resistance.
  • the current generator 30, at the preliminary resistance Rc generates a voltage drop that is equal to the voltage drop U Rc at the emitter resistance Re of the transistor 28.
  • the transistor 29 forms, with transistor 28, a counter coupled degenerate system that ensures identical voltage drops at the resistances Rc and Re. As a result, the current I of the current generator is also kept constant.
  • the current of the current generator 30 is therefore smaller by a factor of 100 than the constant-current that finally flows into the DC/DC converter 11.
  • constant-current generators can also be provided, for example, a current generator with an inverted operation amplifier, Howland current generators, etc.
  • the supply voltage generated by the power supply circuit 11 for the audio amplifier 10 is not regulated in a preferred embodiment.
  • a regulation circuit 47, 48 is provided between diode 18 and resistance 8, comprising of a digital regulation loop 47 and an analog regulation loop 48, provided for the polarization voltage applied to the microphone capsule 9.
  • Fig. 6 in combination with Fig. 7 illustrates such a preferably remote controllable, regulation circuit 47, 48.
  • the control signals required for the regulation of the polarization voltage can be transmitted through at least one of the two cable conductors 1, 2.
  • the detailed structure and the method of operation of such a regulation circuit 47, 48 are described further below.
  • no regulation circuit is provided in the supply loop 15 for the audio amplifier 10.
  • the entire power - which is not used for other circuit parts, such as processors, control electronics 39, polarization voltage at the microphone capsule 9, A/D or D/A converter 44, 46, LED displays 25 - is available for the audio amplifier 10.
  • a high maximal audio output voltage can be achieved in a current-saving design of the audio amplifier 10, to achieve a high maximal audio output voltage.
  • the supply voltage for the audio amplifier 10 as a result can also exceed the voltage made available by the phantom power supply. Because of the method of action of the power supply circuit 11, it is also possible to produce very simple positive and negative supply voltages for the audio amplifier 10. As a result, the audio amplifier 10 can also use grounding as the rest potential. The supply feed voltage of the audio amplifier (10) can therefore be symmetrically with respect to the grounding.
  • the DC/DC converter 11 of the above described type works with a degree of efficiency of approximately 82%. Because, even in the most advantageous case, power is lost at DC/DC converters, it is advantageous to series-connect, if possible, the consumers to the DC/DC converter. As a result of the use of a constant-current generator 13, it is easily possible to connect consumers with constant-current consumption, for example, a logic supply 24, to make available a fixed direct current, for example, for a control electronics 39, or LED display 25, A/D or D/A converter 44, 46, etc., in series to the DC/DC converter 11.
  • constant-current generator 13 it is easily possible to connect consumers with constant-current consumption, for example, a logic supply 24, to make available a fixed direct current, for example, for a control electronics 39, or LED display 25, A/D or D/A converter 44, 46, etc., in series to the DC/DC converter 11.
  • FIG. 2 A corresponding embodiment of the power supply circuit 11 is shown in Fig. 2 .
  • the difference, compared to Fig. 1 is that only the polarization voltage and the voltage for the audio amplifier 10 are generated through the DC/DC converter.
  • the other consumers like the logic supply 24 for making available a fixed predetermined direct current, for example, for a control electronics 39, or LED displays 25, are series-connected to the DC/DC converter.
  • the series-connected DC/DC converter 11 for the digital supply acts as an active load resistance, where the energy used at this resistance is not converted into heat but, in a majority proportion, is converted to a usable supply power for the audio amplifier 10 and the polarization voltage on the microphone capsule 9.
  • a Zener diode 27 is provided, which is particularly well suited for stabilizing the voltage. Through this diode 27, any current that is not consumed, but delivered by the constant-current generator 13, is released to the grounding. In principle, one can use, instead of the Zener diode 27, any other constant-current generator or a shunt regulator.
  • the released power is the product of the current of the constant-current generator 13 and the voltage applied to the power supply circuit 11.
  • the entire voltage is applied to the DC/DC converter 11 and all the voltages are generated through the DC/DC converter.
  • the voltage is divided into a portion that is applied to the DC/DC converter 11 and a second portion that is applied to the LEDs 25 and the digital supply.
  • the DC/DC converter represents an active preliminary resistance for the LEDs 25 or the digital supply. Since the current consumption of the digital supply is not constant, but the current I is kept constant by the current generator 13, the excess current that exists, depending on the state of operation of the digital electronics, has to be bled off through the Zener diode 27.
  • the power P I x voltage available at the DC/DC converter x degree of efficiency of the DC/DC converter is available.
  • the power P I x voltage at the digital electronics and LEDs is available.
  • the current consumption of the audio amplifier 10, in the uncontrolled state is approximately 0.8 mA
  • the current consumption of the digital electronics is approximately 4.2 mA.
  • the current generator 13 delivers a constant-current of approximately 4.7 mA.
  • This voltage is much higher than the voltage of 24 V delivered by the phantom power supply unit 31 during power adaptation.
  • the polarization voltage is also generated on the membrane of the capsule 9, the value of the supply voltage of the audio amplifier 10, which is actually reached, is slightly lower than this value, but still much higher than the 24 V available without the DC/DC converter.
  • Fig. 5 shows a microphone 54, which is connected with a transmitter or a remote control unit 55.
  • the remote control of important microphone parameters here occurs directly through the audio cable, that is, through the lines 1, 2.
  • the control unit 55 is preferably on the mixer, or arranged in front of it.
  • a microcontroller 35 with a parameter control input 34 controls a frequency modulator 36, which feeds a frequency-modulated signal with the same level into the two cable conductors 1, 2 of the audio cable.
  • the frequency-modulated signal can then be suppressed as a common mode signal in the input-difference amplifier 42.
  • a supply voltage of a phantom power unit 31 is applied through the feeder resistances 32, 33 to the two cable conductors 1, 2.
  • the frequency-modulated signal is applied to only one of the conductors of the audio cable, namely, to the conductor 2, which is not intended for the audio signal.
  • the frequency-modulated signal is generated by FSK (frequency shift keying) or CPFSK (continuous phase FSK). Both modulations are procedures that are known from digital data transfer technology. In principle, it also possible to use ASK (amplitude shifting keying) or PSK (phase shift keying) modulation. However, ASK is much more likely to be subject to interferences, and PSK modulation is more difficult to carry out from the point of view of circuit technology. In contrast to the known applications of the above-mentioned methods, in the case of use in microphones, the crucial factor is that the modulated signal has to be separated from an analog signal, the audio signal.
  • FSK frequency shift keying
  • CPFSK continuous phase FSK
  • the frequency-modulated voltage is separated by means of a filter 37, for example, a band pass filter, from the audio signals, and the control information contained therein is evaluated by means of a control electronics 39, for example a microcontroller or a CPLD (Complex Programmable Logic Device). Cable conductor 2 is uncoupled through a capacitance 43 from the grounding.
  • the control electronics 39 is connected in front of a comparator 38 which functions as a voltage comparator. Commands through the outputs of the control electronics 39, for example, reach a power supply circuit 11, as can be seen in Figs. 1 and 2 , the audio amplifier 10, processors, control electronics 39, A/D or D/A converters 44, 46, etc.
  • the frequency modulation on the two audio lines 1, 2 is carried out in the remote control unit 55, which is preferably located close to the mixing table.
  • the remote control unit 55 on the one hand, the carrier frequency has to be applied in the direction toward the microphone 54, and, on the other hand, in the direction of the mixing table, all modulation frequencies have to be suppressed. Only the audio signals that come from the microphone 54 must be transmitted. To make the suppression of the modulation frequencies simpler, the modulation is carried out on both audio lines 1, 2 with the same level.
  • the frequency-modulated signal appears as a common mode signal for the input-difference amplifier 42 and thus it can, as a common mode signal, be appropriately suppressed.
  • the frequency modulation occurs only in the line that does not transit an audio signal, that is, line 2.
  • the frequency-modulated signals can be eliminated by filtering through a low-pass filter 41.
  • the data-acknowledge message can also be a frequency-modulated signal.
  • the data-acknowledge message for the function of the remote control is not absolutely necessary; however, it increases the reliability of the system at the cost of additional electronics.
  • Fig. 6 shows a capacitor microphone according to the invention, in which the regulation of the polarization voltage occurs by means of a two-step control regulation loop.
  • a second digital regulation loop 47 is overlain above an internal analog regulation loop 48.
  • a preferably frequency-modulated signal with control information which is transmitted through the cable conductors, which are also connected to the phantom power unit 31, reaches the control electronics 39 through a filter 37 and a comparator 38.
  • the control of the control electronics 39 can also occur via regulating devices or operating elements on the microphone itself. It is also possible, that the control electronics is connected to a radio or an infrared interface for the purpose wireless transmission or to a cable interface.
  • the desired value obtained in the control signal for the polarization voltage is delivered to the analog regulation 48 via a D/A converter 46 by the control electronics 39.
  • Fig. 7 is an embodiment example, showing how the control electronics 39, which is for example a microcontroller or a CPLD, plus D/A converter or PWM 46 acts on an analog regulation loop 48.
  • the analog regulation loop 48 comprises a regulation circuit 56 and a voltage divider 49, 50. The details of the regulation circuit 56 or of the overall analog regulation loop 48 are shown in Fig. 7 .
  • the analog regulation loop 48 is preferably supplied by a power supply circuit 11 with an unregulated voltage of approximately 100-120 V.
  • the DC/DC converter can be of the same type as described above, or represented in Figs 1 and 2 .
  • the resistances 5 and 6 are the feeder resistances in the microphone. They are used for uncoupling the power supply of the microphone from the output of the audio amplifier 10.
  • the resistances 5 and 6 are identical in size to preserve the symmetry of the lines 1 and 2.
  • the invention is of course not restricted to phantom power supplied capacitor microphones.
  • the energy supply for the individual power receivers of the capacitor microphone can, for example, also be carried out by a battery located in the microphone.
  • a preferred embodiment provides a low pass filter 51 between D/A converter or PWM 46 and the input of the analog regulation loop 48, as represented in Fig. 7 .
  • the actual value generated by the analog regulation loop 48 is taken up through a voltage divider 49, 50 and applied via an impedance converter 53 to the inverted input of the operation amplifier 52.
  • the feedback line plus impedance converter is not included in the schematic drawing of Fig. 6 .
  • this voltage is also applied to the input of an A/C converter 44 of the digital regulation loop 47.
  • the resulting digital signal is made available to the control electronics 39 as feedback. As a result, the outer digital regulation loop 47 is closed.
  • the correction voltages or the corresponding correction factors that are required to calculate a regulated and interference-free polarization voltage can correspond to different settings, which reflect certain sensitivities, guide characteristics, and aging parameters; they can be stored in a memory provided in the control electronics 39, and called up at any time.
  • the invention is not limited to the individual embodiment examples. Naturally, it is also conceivable to use microphones in which all or at least some of the above-described circuits are combined.
  • a remote control for all remote-controllable components can be provided in the microphone; also, the power supply circuit 11 can supply all conceivable power receivers in the microphone.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Circuit For Audible Band Transducer (AREA)
  • Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)

Claims (10)

  1. Kondensatormikrofon, umfassend zumindest eine Mikrofonkapsel (9), dadurch gekennzeichnet, dass das Kondensatormikrofon zumindest einen Schaltkreis zur Regelung der Polarisationsspannung umfasst, wobei der Schaltkreis zur Regelung der Polarisationsspannung eine analoge Regelschleife (48), die mit einer ungeregelten Spannung beliefert wird, und eine digitale Regelschleife (47) umfasst, bei welcher die digitale Regelschleife (47) eine Steuerelektronik (39) umfasst, z.B. einen Mikrocontroller oder eine CPLD, die der analogen Regelschleife (48) einen gewünschten Wert für die Polarisationsspannung bereitstellt, welcher unter Verwendung von Korrekturfaktoren berechnet wird, und bei welcher der Ausgang der analogen Regelschleife (48) zum Zwecke einer Rückmeldung mit einer Steuerelektronik (39) verbunden ist.
  2. Kondensatormikrofon nach Anspruch 1, dadurch gekennzeichnet, dass die Energieversorgung des Mikrofons durch eine Phantomspeisungseinheit (31) über die Kabelleiter (1, 2) des Audiokabels, die sogenannte Phantomspeisung, durchgeführt wird.
  3. Kondensatornnikrofon nach Anspruch 1, dadurch gekennzeichnet, dass die Energieversorgung des Mikrofons durch eine Batterie im Mikrofon durchgeführt wird.
  4. Kondensatormikrofon nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass der Schaltkreis zur Regelung der Polarisationsspannung eine Referenzspannungsquelle (45) umfasst, bezüglicher welcher die digitale Regelschleife (47) den gewünschten Wert für die analoge Regelschleife (48) erzeugt.
  5. Kondensatormikrofon nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass der Referenzspannungswert in der Steuerelektronik (39) zur Berechnung des gewünschten Spannungswerts bereitgestellt wird.
  6. Kondensatormikrofon nach einem der Ansprüche 4 bis 5, dadurch gekennzeichnet, dass die Steuerelektronik (39) einen Speicher, in welchem die Korrekturfaktoren gespeichert sind, umfasst.
  7. Kondensatormikrofon nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass die Steuerelektronik (39) fernsteuerbar ist.
  8. Kondensatormikrofon nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass die Steuerelektronik (39) mittels einer Regeleinrichtung am Mikrofon steuerbar ist.
  9. Kondensatormikrofon nach Anspruch 2 und Anspruch 7, dadurch gekennzeichnet, dass die Steuerelektronik durch zumindest einen der Kabelleiter (1, 2) mit einer Fernsteuerungseinheit (55) verbunden ist.
  10. Kondensatormikrofon nach Anspruch 7, dadurch gekennzeichnet, dass die Steuerelektronik (39) mit einer Radio- oder einer Infrarotschnittstelle oder einer Kabelschnittstelle verbunden ist.
EP04450073A 2004-03-30 2004-03-30 Einstellung der Polarisationsspannung von Mikrofonen Expired - Lifetime EP1585365B1 (de)

Priority Applications (7)

Application Number Priority Date Filing Date Title
EP04450073A EP1585365B1 (de) 2004-03-30 2004-03-30 Einstellung der Polarisationsspannung von Mikrofonen
AT04450073T ATE520263T1 (de) 2004-03-30 2004-03-30 Einstellung der polarisationsspannung von mikrofonen
JP2005013410A JP4662782B2 (ja) 2004-03-30 2005-01-20 マイクロホンの成極電圧設定
CN200510002548.0A CN1678134B (zh) 2004-03-30 2005-01-20 电容式麦克风
US11/093,762 US7356151B2 (en) 2004-03-30 2005-03-30 Microphone system
US11/094,825 US7835531B2 (en) 2004-03-30 2005-03-30 Microphone system
US11/094,805 US7620189B2 (en) 2004-03-30 2005-03-30 Polarization voltage setting of microphones

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP04450073A EP1585365B1 (de) 2004-03-30 2004-03-30 Einstellung der Polarisationsspannung von Mikrofonen

Publications (2)

Publication Number Publication Date
EP1585365A1 EP1585365A1 (de) 2005-10-12
EP1585365B1 true EP1585365B1 (de) 2011-08-10

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EP04450073A Expired - Lifetime EP1585365B1 (de) 2004-03-30 2004-03-30 Einstellung der Polarisationsspannung von Mikrofonen

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JP (1) JP4662782B2 (de)
CN (1) CN1678134B (de)
AT (1) ATE520263T1 (de)

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CN101060726B (zh) * 2006-04-21 2011-10-12 探微科技股份有限公司 制作电容式麦克风元件的振膜的方法
CN101064969B (zh) * 2006-04-24 2011-11-30 探微科技股份有限公司 制作电容式麦克风元件的振膜的方法
JP4947708B2 (ja) * 2007-02-16 2012-06-06 株式会社オーディオテクニカ コンデンサーマイクロホンユニットおよびコンデンサーマイクロホン
DE102008022588A1 (de) 2007-05-09 2008-11-27 Henrik Blanchard Kondensatormikrofon und Verfahren zum Betreiben desselben
JP5006109B2 (ja) * 2007-06-01 2012-08-22 株式会社オーディオテクニカ コンデンサーマイクロホン
DE102016105904B4 (de) * 2016-03-31 2019-10-10 Tdk Corporation MEMS-Mikrofon und Verfahren zur Selbstkalibrierung des MEMS-Mikrofons
CN109634340B (zh) * 2018-12-19 2023-10-13 卡斯柯信号有限公司 一种压控恒流源输出电路

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JP3222994B2 (ja) * 1993-06-29 2001-10-29 株式会社オーディオテクニカ ファントム給電方式マイクロホンにおける遠隔制御装置
DE19606261C2 (de) * 1996-02-06 1998-04-09 Stage Tec Entwicklungsgesellsc Mikrofon mit zugeortnetem Verstärker
JP2000217188A (ja) * 1999-01-20 2000-08-04 Nec Niigata Ltd コンデンサマイクロフォン接続回路
EP1259096A2 (de) * 2001-05-14 2002-11-20 AKG Acoustics GmbH Innenisolation elektroakustischer Kapsel

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CN1678134B (zh) 2012-02-15
EP1585365A1 (de) 2005-10-12
CN1678134A (zh) 2005-10-05
JP2005287000A (ja) 2005-10-13
JP4662782B2 (ja) 2011-03-30
ATE520263T1 (de) 2011-08-15

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