EP0096778B1 - Microphone - Google Patents

Microphone Download PDF

Info

Publication number
EP0096778B1
EP0096778B1 EP83105247A EP83105247A EP0096778B1 EP 0096778 B1 EP0096778 B1 EP 0096778B1 EP 83105247 A EP83105247 A EP 83105247A EP 83105247 A EP83105247 A EP 83105247A EP 0096778 B1 EP0096778 B1 EP 0096778B1
Authority
EP
European Patent Office
Prior art keywords
microphone
voltage
amplifier
output
accordance
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
Application number
EP83105247A
Other languages
German (de)
English (en)
Other versions
EP0096778A2 (fr
EP0096778A3 (en
Inventor
Otmar Dipl.-Ing. Kern
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Georg Neumann GmbH
Original Assignee
Georg Neumann GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Georg Neumann GmbH filed Critical Georg Neumann GmbH
Priority to AT83105247T priority Critical patent/ATE36629T1/de
Publication of EP0096778A2 publication Critical patent/EP0096778A2/fr
Publication of EP0096778A3 publication Critical patent/EP0096778A3/de
Application granted granted Critical
Publication of EP0096778B1 publication Critical patent/EP0096778B1/fr
Expired legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R3/00—Circuits for transducers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R19/00—Electrostatic transducers
    • H04R19/04—Microphones

Definitions

  • the invention relates to a microphone according to the preamble of claim 1.
  • a microphone is known from DE-A-2126 385, Fig. 2 for the case of a 12V phantom power.
  • a phantom circuit is often used to power a microphone, in which the supply voltage is connected to the two wires of the symmetrical LF connection between the microphone and the consumer (impedance) with the same polarity via two resistors of the same size, usually 6.8 kOhm with 48V supply voltage is.
  • the definition of the relatively high supply voltage at 48V had its original meaning in that the necessary microphone capsule voltage should be made available without further voltage transformation.
  • the relatively high internal resistance of the power supply due to the two 6.8 kOhm resistors and the maximum permissible current draw limit the power available to the microphone, with the result that an impedance adjustment to the standardized minimum load resistance of 1 kOhm of the microphone is required .
  • a transformerless power supply for microphones is known as “Tonaderspeisung” also from “Radio Mentor”, vol. 33, no. 7, July 1967, p. 531, fig. 9 and from “Funkschau”, 1969, h. 10, p. 316 .
  • the supply voltage of 12V with opposite polarities is applied to the two wires of the symmetrical LF connection via 180 ohm resistors. This is because of the low internal resistance and the relatively low supply voltage, a sufficient power adjustment of the microphone to the normalized microphone load, but it is necessary in any case to generate the higher microphone capsule voltage of z.
  • B. 50V to use a powerless DC-DC converter.
  • This DC-DC converter simultaneously generates the operating voltage for a preamplifier stage, but not for the power output stage, which receives its operating voltage directly from the tone wires. The need for an impedance matching does not arise for the DC / DC converter.
  • transformerless microphone with phantom power provides the supply of the power amplifier used directly from the tone wires, so that the impedance mismatch described at the outset is accepted, which leads to a restriction of the possible dynamic range.
  • a separate, powerless DC-DC converter is used, similar to the tone wire supply.
  • the object of the invention is to provide a microphone of the type mentioned at the outset which, despite the avoidance of a transformer in the LF signal path, enables impedance matching and thus a significantly higher utilization of the dynamic range.
  • the invention is based on the idea of moving the necessary impedance matching from the LF signal path into the power supply line of the amplifier built into the microphone.
  • an operating voltage adapted to the load for the amplifier is obtained by means of a DC voltage converter.
  • the existing DC-DC converter also allows different voltages to be generated for the microphone capsule, as are required to achieve different directional characteristics.
  • training the DC voltage converters in the form of a flyback converter can be used to achieve two significantly different DC voltages by means of one and the same storage inductance by using a delay device for the time-delayed supply of the voltage occurring in the blocking phase to a rectifier device with particularly high efficiency.
  • the dash-dotted circuit block 1 indicates the microphone and the dash-dotted circuit block 2 the power supply source.
  • the microphone 1 is connected via a 2-wire LF cable 3 to the power supply source 2, which contains the LF consumer Z L as the terminating impedance of the cable 3 and a DC voltage source B of, for example, +48 V, the positive pole of which is connected to each wire of the cable 3 is connected via equally large resistors R (e.g. 6, 8 kOhm).
  • This phantom power supply for the microphone 1 represents the most common case of the power supply for the microphone 1, but the invention is not restricted to this type of power supply.
  • the microphone 1 includes in its LF signal path a microphone capsule 30, which is connected to the input of a microphone amplifier 20 via a series capacitor 40, which is used to separate the DC component in the output current of the capsule 30.
  • a microphone capsule 30 Connected to the output terminals 21, 22 of the amplifier are, on the one hand, the wires of the cable 3 and, on the other hand, the input terminals of a coupling device 50, which couples out the supply voltage fed from the source B via the wires of the cable 3 and feeds it to the input 11 of a DC voltage converter 10.
  • a coupling device 50 which couples out the supply voltage fed from the source B via the wires of the cable 3 and feeds it to the input 11 of a DC voltage converter 10.
  • 2 and 3 DC voltage converter 10 shown in more detail works, for example, as a flyback converter, which has a pulse-width-controlled switching element, in the blocking phase of which the output voltages U B1 and U B2 are generated at the output terminals 13 and 14 of the converter 10.
  • the output voltage U S1 at the output terminal 13 is fed via a series resistor 60 to the capsule 30 for its voltage supply.
  • the output voltage U B2 at the output terminal 14 serves as the operating voltage for the amplifier 20.
  • the generation of the voltages U B1 and UB2 by means of the coupling device 50 and the DC-DC converter 10 allows the microphone 1 to be optimally adapted to the available power of the source B, without the need for a transformer at the microphone output. As a result, the entire dynamic range of the microphone 1 which is possible per se can be used for the first time in the case of a transformerless microphone.
  • the DC-DC converter 10 can preferably be designed as a flyback converter, the primary winding w1 of which is connected to the one winding end at the converter input 11 and to the other winding end via a switching element Tr, in the example shown a switching transistor, with a reference potential (ground) is.
  • the control input of the switching element Tr is connected to the output 17 of a controller 15, the input 16 of which is connected to the output terminal 14 of the converter 10, so that the voltage U B2 is supplied to the controller 15 as an actual value.
  • the controller 15 controls the opening and closing times of the switching element Tr in accordance with a pulse width regulation, so that the energy stored in the primary winding w1 and taken from the secondary windings w21, w22, w23 in each cycle period also in the event of fluctuations in the power supply on the part of source B (FIG. 1 ) is kept at the desired constant value.
  • the primary winding w1 is coupled to two or three secondary windings w21, w22 and w23, each of which feeds an output rectifier D1, C1 or D2, C2 or D3, C3.
  • the output rectifier D1, C1 generates the output voltage U B2 at the output terminal 14, while the output rectifier D2, C2 generates the output voltage U B1 at the output terminal 13.
  • the third output rectifier D3, C3, shown in broken lines in FIG. 2, can be provided, if necessary, for generating a further output voltage U B3 , for example in order to switch the directional characteristic of the microphone capsule 30 (FIG. 1) in a known manner.
  • the time profile of the reverse voltage Usperr shown in solid lines in FIG. 4 is advantageously generated on the secondary windings w21 and w22.
  • the larger output voltage U S1 at the output terminal 13 is obtained from the first voltage peak of the blocking voltage U block before the blocking voltage U block assumes the value U B2 at the output terminal 14.
  • a time window of width AT (FIG. 4) is used to mask out the first voltage peak. used, which is realized by a time delay device arranged between the secondary winding w21 and the output rectifier 01, C1. In the simplest case, this time delay device consists of a series inductance L (FIG. 2).
  • a longitudinal thyristor Th (FIG. 3) can be provided, which is controlled by a comparator 12.
  • the comparator 12 compares the voltage at the anode of the thyristor Th with a reference voltage U ref (corresponds to the amount U B1 in FIG. 3) and blocks, for example, the thyristor Th until the voltage at its anode reaches the value of the reference voltage U ref , that is during a time interval ⁇ T.
  • Both voltages U B1 and U B2 can be obtained both from a common winding w2 and from separate windings w21 and w22.
  • the voltage U B1 is brought to the desired value either by limiting the voltage U s err by the diodes ZD and D4 (FIG. 2) or by comparison with U ref by means of the comparator 12, while the voltage U B2 is brought about in a known manner the effect of the controller 15 is kept constant.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Dc-Dc Converters (AREA)
  • Measuring Pulse, Heart Rate, Blood Pressure Or Blood Flow (AREA)
  • Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)
  • Amplifiers (AREA)

Claims (7)

1. Microphone étant alimenté par une source de courant (2) de manière normalisée en circuit fantôme, comprenant
une capsule de microphone (30),
un amplificateur (20) monté en série à la capsule de microphone pour actionner une impédance (ZJ chargeant la sortie du microphone,
un dispositif de couplage (50) pour découpler la puissance mise à disposition par la source- fantôme (B), et
un convertisseur de courant continu (10) arrangé entre le dispositif de couplage et l'amplificateur pour générer le voltage de régime pour l'amplificateur, caractérisé en ce que la sortie de l'amplificateur (21, 22) est lié sans interposition d'un transformateur à la sortie du microphone resp. l'impédance (ZJ de charge, et que le convertisseur de courant continu (10) est formé tel que la puissance mise à disposition par la source de courant en circuit fantôme (B) est convertie à l'égard du rapport entre voltage et courant de manière que l'amplificateur (20) obtient l'optimum du rapport voltage de régime/courant concernant l'impédance (ZJ chargeant la sortie du microphone.
2. Microphone selon revendication 1, caractérisé en ce que le convertisseur de courant continu (10) est réalisé en circuit inverse de conversion.
3. Microphone selon revendication 2, la tension de sortie du convertisseur de courant continu étant générée durant la phase inverse d'un élément de commutation réglé par largeur d'impulsion, caractérisé par un dispositif (L ; 12, Th) pour alimenter en mode temporisé la tension occurante pendant la phase inverse à la sortie du circuit redresseur (D1, C1), de manière que la tension inverse est limitée à la valeur inverse (UB2) produite par le circuit redresseur.
4. Microphone selon la revendication 3, caractérisé en ce qu'une inductance série (L) est prévue comme dispositif de temporisation.
5. Microphone selon la revendication 3, caractérisé en ce qu'un thyristor longidutinal (Th) commandé par un comparateur (12) est prévu comme dispositif de temporisation.
6. Microphone selon les revendications 3 ou 5, caractérisé par un dispositif (ZD, D4) pour limiter la valeur de tension (Ua,) de la tension inverse (Usperr) qui se manifeste pendant la temporisation (OT).
7. Microphone selon la revendication 6, caractérisé en ce que le dispositif de limitation (ZD, D4) consiste d'un circuit en série d'une diode Zener (ZD) et d'une diode (D4) arrangé en parallèle au dispositif de temporisation (L).
EP83105247A 1982-06-14 1983-05-26 Microphone Expired EP0096778B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT83105247T ATE36629T1 (de) 1982-06-14 1983-05-26 Mikrofon.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3222295 1982-06-14
DE3222295 1982-06-14

Publications (3)

Publication Number Publication Date
EP0096778A2 EP0096778A2 (fr) 1983-12-28
EP0096778A3 EP0096778A3 (en) 1985-12-04
EP0096778B1 true EP0096778B1 (fr) 1988-08-17

Family

ID=6166020

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83105247A Expired EP0096778B1 (fr) 1982-06-14 1983-05-26 Microphone

Country Status (4)

Country Link
US (1) US4541112A (fr)
EP (1) EP0096778B1 (fr)
AT (1) ATE36629T1 (fr)
DE (1) DE3377765D1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010054895A1 (de) * 2010-12-17 2012-06-21 Austriamicrosystems Ag Mikrofonverstärker

Families Citing this family (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2734265B2 (ja) * 1991-12-12 1998-03-30 日本電気株式会社 エレクトレット・コンデンサ・マイクロフォン用増幅回路
US5377273A (en) * 1992-03-26 1994-12-27 Hewlett-Packard Company Batteryless power supply for transducers
AU725165B2 (en) 1996-12-11 2000-10-05 Gn Netcom A/S Power supply for microphone
JP3890301B2 (ja) * 2003-01-15 2007-03-07 株式会社オーディオテクニカ コンデンサマイクロホン
CN100581032C (zh) 2003-12-01 2010-01-13 音频专用集成电路公司 具有电压泵的麦克风
EP1585365B1 (fr) * 2004-03-30 2011-08-10 AKG Acoustics GmbH Réglage de la tension de polarisation de microphones
EP1585360B1 (fr) * 2004-03-30 2017-05-10 AKG Acoustics GmbH Dispositif d'alimentation de microphones à alimentation fantôme
EP1585359B1 (fr) * 2004-03-30 2017-10-04 AKG Acoustics GmbH Télécommande de microphones à alimentation fantôme
US7835531B2 (en) 2004-03-30 2010-11-16 Akg Acoustics Gmbh Microphone system
JP4304118B2 (ja) * 2004-04-22 2009-07-29 株式会社オーディオテクニカ マイクロホンの出力コネクタ
JP4579778B2 (ja) * 2004-08-17 2010-11-10 ルネサスエレクトロニクス株式会社 センサ用電源回路およびそれを用いたマイクロホンユニット
DE102005007623A1 (de) * 2005-02-18 2006-08-31 Robert Bosch Gmbh Mikrofon
DE102008022588A1 (de) 2007-05-09 2008-11-27 Henrik Blanchard Kondensatormikrofon und Verfahren zum Betreiben desselben
DE102010000686B4 (de) * 2010-01-05 2018-05-09 Sennheiser Electronic Gmbh & Co. Kg Kondensatormikrofon
US9544027B2 (en) * 2014-02-19 2017-01-10 Texas Instruments Incorporated Loop powered transmitter with a single tap data isolation transformer and unipolar voltage converters
WO2018053498A1 (fr) 2016-09-19 2018-03-22 Chandler Limited, Inc. Système de microphone pour couplage direct à des dispositifs d'enregistrement
JP7410935B2 (ja) 2018-05-24 2024-01-10 ザ リサーチ ファウンデーション フォー ザ ステイト ユニバーシティー オブ ニューヨーク 容量性センサ
CN112217482B (zh) * 2020-08-31 2024-02-13 湖南大学 电声换能系统及其阻抗匹配控制方法
CN114040301B (zh) * 2021-11-15 2024-02-27 歌尔微电子股份有限公司 麦克风快速启动电路、麦克风芯片及麦克风

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1240128B (de) * 1964-08-01 1967-05-11 Sennheiser Electronic Hochfrequenzkondensatormikrophon mit einem Oszillator und einem angekoppelten, auf dessen Frequenz abgestimmten Schwingkreis, dessen Kapazitaet das Wandlerelement bildet
AT298583B (de) * 1970-06-08 1972-05-10 Akg Akustische Kino Geraete Kapazitiver Schallempfänger Kapazitiver Schallempfänger
US4122514A (en) * 1976-11-01 1978-10-24 Hewlett-Packard Company Direct current power supply

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010054895A1 (de) * 2010-12-17 2012-06-21 Austriamicrosystems Ag Mikrofonverstärker
DE102010054895B4 (de) 2010-12-17 2018-10-31 Austriamicrosystems Ag Mikrofonverstärker

Also Published As

Publication number Publication date
US4541112A (en) 1985-09-10
EP0096778A2 (fr) 1983-12-28
EP0096778A3 (en) 1985-12-04
ATE36629T1 (de) 1988-09-15
DE3377765D1 (en) 1988-09-22

Similar Documents

Publication Publication Date Title
EP0096778B1 (fr) Microphone
DE3111776C2 (de) Stereoverstärkeranlage
DE102005055160B4 (de) Regelschaltung zur Strom- und Spannungregelung in einem Schaltnetzteil
EP0380033B1 (fr) Disposition de circuit pour alimentation à découpage à récuperation à circuit résonnant
DE4130576C1 (fr)
DE3221693A1 (de) Teilnehmeranschlussschaltung fuer fernsprechanlagen
DE2821683A1 (de) Schaltersystem
DE2328026A1 (de) Schalterartig arbeitendes netzgeraet
DE60205058T2 (de) Schaltnetzteil
DE2749847A1 (de) Schaltnetzteil fuer einen rundfunkempfaenger, insbesondere einen fernsehempfaenger
DE2651196A1 (de) Schaltnetzteil fuer ein geraet der nachrichtentechnik, insbesondere einen fernsehempfaenger
DE2647146C2 (de) Spannungsregler
DE4001325B4 (de) Gleichspannungssperrwandler
DE2250857C3 (de) Horizontalablenkschaltung für Fernsehempfänger
DE1283878B (de) Stromyersorgungsschaltung mit Energierückgewinnung für eine Horizontalablenkstufe eines Fernsehempfängers
DE2608167B2 (de) Geregelter Eintakt-Durchflußumrichter zur Erzeugung mehrerer galvanisch getrennter Ausgangsspannungen
WO2006106040A1 (fr) Procede de fonctionnement d'une alimentation a decoupage avec recuperation d'energie de diffusion cote primaire
DE2718999A1 (de) Spannungs- oder stromgeregelter spannungswandler
DE2953289C2 (fr)
EP0266743A2 (fr) Disposition de circuit pour produire une tension d'alimentation interne dans une alimentation de courant à découpage
DE2852942B2 (de) Bildwiedergabe-Schaltungsanordnung
DE2740110B2 (de) Geschaltete Ost-West-Rasterkorrekturschaltung
EP0263936A1 (fr) Alimentation de puissance à commutation sur le circuit secondaire
DE2621471C3 (de) Schaltung zur Regelung der Ausgangsspannungen einer Kommutatorablenkschaltung
EP0228582B1 (fr) Circuit pour la génération d'une tension de fonctionnement et d'un courant de déflection horizontal

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): AT BE CH DE FR GB IT LI NL SE

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Designated state(s): AT BE CH DE FR GB IT LI NL SE

17P Request for examination filed

Effective date: 19860124

17Q First examination report despatched

Effective date: 19870504

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT BE CH DE FR GB IT LI NL SE

REF Corresponds to:

Ref document number: 36629

Country of ref document: AT

Date of ref document: 19880915

Kind code of ref document: T

REF Corresponds to:

Ref document number: 3377765

Country of ref document: DE

Date of ref document: 19880922

ITF It: translation for a ep patent filed
GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)
ET Fr: translation filed
PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
ITTA It: last paid annual fee
REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

REG Reference to a national code

Ref country code: CH

Ref legal event code: AEN

EAL Se: european patent in force in sweden

Ref document number: 83105247.7

REG Reference to a national code

Ref country code: GB

Ref legal event code: IF02

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: SE

Payment date: 20020328

Year of fee payment: 20

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: CH

Payment date: 20020416

Year of fee payment: 20

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 20020423

Year of fee payment: 20

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20020516

Year of fee payment: 20

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: AT

Payment date: 20020517

Year of fee payment: 20

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: BE

Payment date: 20020524

Year of fee payment: 20

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 20020529

Year of fee payment: 20

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: NL

Payment date: 20020531

Year of fee payment: 20

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LI

Free format text: LAPSE BECAUSE OF EXPIRATION OF PROTECTION

Effective date: 20030525

Ref country code: GB

Free format text: LAPSE BECAUSE OF EXPIRATION OF PROTECTION

Effective date: 20030525

Ref country code: CH

Free format text: LAPSE BECAUSE OF EXPIRATION OF PROTECTION

Effective date: 20030525

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NL

Free format text: LAPSE BECAUSE OF EXPIRATION OF PROTECTION

Effective date: 20030526

Ref country code: AT

Free format text: LAPSE BECAUSE OF EXPIRATION OF PROTECTION

Effective date: 20030526

BE20 Be: patent expired

Owner name: *GEORG NEUMANN G.M.B.H.

Effective date: 20030526

REG Reference to a national code

Ref country code: GB

Ref legal event code: PE20

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

EUG Se: european patent has lapsed
NLV7 Nl: ceased due to reaching the maximum lifetime of a patent

Effective date: 20030526