EP0794686B1 - Mikrofon mit zugeordnetem Verstärker - Google Patents

Mikrofon mit zugeordnetem Verstärker

Info

Publication number
EP0794686B1
EP0794686B1 EP97250020A EP97250020A EP0794686B1 EP 0794686 B1 EP0794686 B1 EP 0794686B1 EP 97250020 A EP97250020 A EP 97250020A EP 97250020 A EP97250020 A EP 97250020A EP 0794686 B1 EP0794686 B1 EP 0794686B1
Authority
EP
European Patent Office
Prior art keywords
microphone
channel
digital
associated amplifier
signal
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
EP97250020A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0794686A3 (de
EP0794686A2 (de
Inventor
Helmut Dr. Jahne
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.)
Stage Tec Entwicklungsgesellschaft fur Professionelle Audiotechnik Mbh
Original Assignee
Stage Tec Entwicklungsgesellschaft fur Professionelle Audiotechnik Mbh
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 Stage Tec Entwicklungsgesellschaft fur Professionelle Audiotechnik Mbh filed Critical Stage Tec Entwicklungsgesellschaft fur Professionelle Audiotechnik Mbh
Publication of EP0794686A2 publication Critical patent/EP0794686A2/de
Publication of EP0794686A3 publication Critical patent/EP0794686A3/de
Application granted granted Critical
Publication of EP0794686B1 publication Critical patent/EP0794686B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R3/00—Circuits for transducers, loudspeakers or microphones

Definitions

  • the invention relates to a microphone with associated amplifier, which are digitally constructed.
  • the field of application of the invention lies in studio technology, radio and television technology, as well as theater and music production.
  • faults can easily be coupled into the cables between microphone and microphone amplifier, so that special laying regulations must be observed, in particular if mains or even light control lines run parallel.
  • a digital output microphone is known from US patent US 5 051 799 A.
  • the sampling clock is necessary for synchronously sampling the audio values with the other connected digital processing devices. Operation of the microphone as a sampling clock source with solid Quarzor is not possible because the connection of several microphones must be possible and therefore can not synchronize the connected device to the microphone.
  • the separate power supply cable is necessary due to the required power of approx. 0.5 ... 1 watt.
  • multiple microphone cables or a special cable is a major problem, because when converting from analog to digital technology not only the microphone and the associated amplifier must be replaced, but also the installations in the respective houses.
  • a modulation of the required signals to the digital audio cable which may be plug-compatible with the analog audio cable, fails because of the high effort and space required for this in the microphone.
  • the cost of obtaining the jitter-poor sampling clock which is generally increased by a PLL in addition to a multiple of the sampling clock to operate the analog-to-digital converters, represents a large technical problem with the plurality of standardized sampling frequencies.
  • sampling clock rate converters which can be switched between the microphone and the associated amplifier.
  • sampling clock rate converters have less usable dynamic range than available analog-to-digital converter circuits, which would result in further degradation of the characteristics of a digital microphone.
  • the object of the invention is the development of a microphone with associated amplifier in digital circuit technology, in which the dynamics of the microphone is not limited by the analog-to-digital converter, in which an operation with the microphone cables of an analog microphone is possible and in which the Costs for the construction and space requirements are low.
  • the microphone and associated amplifier each comprise digital circuitry interconnected by a shielded balanced cable, the microphone circuitry including a transducer, two preamplifiers, two analog-to-digital converters and a driver stage for a two-channel digital audio format; wherein the preamplifiers are connected to the output of the transducer, which in turn are each connected to an analog-to-digital converter, and wherein the analog-to-digital converters are connected to the digital driver stage and the associated amplifier a receiver for a two-channel digital audio format and a signal processor, which generates from the two-channel digital audio format a single-channel signal, which is an image of the signal of the sound transducer, and which is used to calculate the usual amplification and filtering in microphones.
  • An advantageous embodiment of the microphone also has a switch and a balancing oscillator, which are connected such that the transducer is alternatively connected to the two preamplifiers or the balancing oscillator with the two preamplifiers, the switch automatically a predetermined time after turning on the microphone or remotely controlled disconnects the balance oscillator and connects the transducer to the preamplifiers, and wherein the predetermined time is such that the signal processor can determine the coefficients required to generate the single-channel signal from the dual-channel digital audio format.
  • an identifier in the two-channel digital audio format can be introduced via the microphone, which indicates the switching state of the switch, whereby in the associated digital amplifier, a muting of the signal of the balancing oscillator by means of the signal processor.
  • the microphone may have its own audio sampling clock oscillator.
  • the necessary sample clock synchronization by means of a two-channel sampling rate converter takes place in the associated digital amplifier, which is arranged between the receiver of the digital audio format and the signal processor.
  • the dual channel digital audio format advantageously conforms to the AES / EBU standard, which allows the transmission of digital audio information over cables and connectors used to transmit analog microphone signals.
  • the average of the differential AES / EBU signal may have a voltage across the screen which powers the digital microphone without additional cables.
  • In the associated amplifier can be modulated on the voltage to power the microphone pulses, which are used for remote control of microphone settings.
  • the task to develop a microphone with associated amplifier is further achieved in that between the two analog-to-digital converters and the digital driver stage, an additional signal processor is connected, which is part of the tasks of the signal processor of the associated amplifier, namely from the two-channel digital audio format generates a single-channel digital audio format, which is an image of the signal of the sound transducer.
  • a digital amplifier is inserted between the receiver for a digital audio format and the two-channel sampling rate converter, which generates an additional, amplified signal from the single-channel digital audio format, whereby the two-channel sampling rate converter on the one hand with the single-channel audio signal and on the other the additional, amplified signal is controlled.
  • the microphone with an assigned amplifier is connected to each other via a shielded balanced cable.
  • the sound transducer 1 a condenser microphone capsule and its impedance converter, which is connected to the switch 3.
  • the switch 3 after switching on the microphone in place of the sound transducer signal, the signal from a balancing oscillator 2 over the transmission chain to the signal processor 14 to provide starting values of an iterative calculation.
  • the two different preamplifiers 4 and 5 are fed, which in turn each control a channel of the dual-channel ADC 6.
  • the ADC 6 transfers the two digitized audio values to the transmitter module 8, which according to the widespread AES / EBU standard provides a two-channel digital audio signal in coded form on a symmetrical two-wire cable.
  • Both the ADC 6 and the AES / EBU transmitter are supplied with the sampling clock fsm of a quartz oscillator, the sampling clock oscillator 7.
  • the AES / EBU standard provides for the use of pulse transmitters on both the transmit and receive sides in professional applications.
  • These pulse transformer 9 are additionally provided here with a center tap for the power supply. In the microphone, the center tap of the pulse transformer 9 is connected to the input of the voltage regulator 10, which in turn supplies the entire microphone with the respectively required voltage VCC.
  • the shielded balanced line 11 can be connected, for example, with the usual in studio technology XLR connectors.
  • the shielded balanced line 11 which comes from the microphone, connected to the pulse transformer 9.
  • the center tap of the pulse transformer 9 is connected via a decoupling diode to the power supply VDC.
  • the decoupling diode allows the use of multiple microphone amplifiers on a microphone.
  • the side of the pulse transformer 9 facing away from the line 11 is connected to the inputs of an AES / EBU receiver module 12, which decodes the two digital audio signals and recovers the sampling clock fsm used in the microphone.
  • the sampling rate converter 13 With the help of the recovered Sample clock fsm and the microphone amplifier clock fs, which is identical to the clock of all other digital audio processing equipment, the sampling rate converter 13, the two digital audio signals of the AES / EBU receiver 12 into digital audio signals that are synchronous to the sampling clock fs convert.
  • the converted digital audio signals are applied to the input of the signal processor 14, which computes the single-channel digital audio signal corresponding to that of the transducer sampled at the sampling frequency fs.
  • the signal processor 14 continues to accept microphone signal amplification and filtering, as does an analog microphone amplifier.
  • the two-channel audio format is still converted in the microphone in a single-channel digital audio signal using an additional signal processor, which on the one hand a standardized transmission is possible when using molded two-channel digital audio driver and receiver circuits and on the other an otherwise usable second transmission channel arises.
  • the single channel digital audio format must be split again by a digital amplifier in the microphone associated amplifier to solve the problems of sample rate conversion.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Circuit For Audible Band Transducer (AREA)
  • Amplifiers (AREA)
  • Golf Clubs (AREA)
  • Fittings On The Vehicle Exterior For Carrying Loads, And Devices For Holding Or Mounting Articles (AREA)
  • Stereophonic System (AREA)
EP97250020A 1996-02-06 1997-02-02 Mikrofon mit zugeordnetem Verstärker Expired - Lifetime EP0794686B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19606261 1996-02-06
DE19606261A DE19606261C2 (de) 1996-02-06 1996-02-06 Mikrofon mit zugeortnetem Verstärker

Publications (3)

Publication Number Publication Date
EP0794686A2 EP0794686A2 (de) 1997-09-10
EP0794686A3 EP0794686A3 (de) 2002-09-25
EP0794686B1 true EP0794686B1 (de) 2006-10-04

Family

ID=7785893

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97250020A Expired - Lifetime EP0794686B1 (de) 1996-02-06 1997-02-02 Mikrofon mit zugeordnetem Verstärker

Country Status (5)

Country Link
US (1) US6028946A (da)
EP (1) EP0794686B1 (da)
AT (1) ATE341920T1 (da)
DE (1) DE19606261C2 (da)
DK (1) DK0794686T3 (da)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1678135B (zh) * 2004-03-30 2012-06-20 Akg声学有限公司 幻象电源供电麦克风的远程控制方法

Families Citing this family (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2330709B (en) * 1997-10-24 2001-07-04 Sony Uk Ltd Signal processors
NO20015983A (no) * 2001-12-06 2003-04-07 Meditron Asa Sangmikrofon
DE60315819T2 (de) * 2002-04-10 2008-05-15 Sonion A/S Mikrofonanordnung
DE10320190B4 (de) 2003-05-07 2005-07-07 Sennheiser Electronic Gmbh & Co. Kg Detektionsvorrichtung
CN1879446B (zh) * 2003-11-24 2011-02-16 桑尼奥公司 包括整体多电平量化器和单比特转换装置的麦克风
EP1565034A1 (en) * 2004-02-16 2005-08-17 STMicroelectronics S.r.l. Packaged digital microphone device with auxiliary line-in function
US7319768B2 (en) * 2004-03-16 2008-01-15 Phonak Ag Hearing aid and method for the detection and automatic selection of an input signal
EP1585365B1 (en) * 2004-03-30 2011-08-10 AKG Acoustics GmbH Polarization voltage setting of microphones
US7356151B2 (en) * 2004-03-30 2008-04-08 Akg Acoustic Gmbh Microphone system
JP2009502062A (ja) 2005-07-19 2009-01-22 オーディオアシクス エー／エス プログラム可能なマイクロフォン
US7848715B2 (en) * 2007-05-03 2010-12-07 Infineon Technologies Ag Circuit and method
US9467774B2 (en) 2012-02-10 2016-10-11 Infineon Technologies Ag System and method for a PCM interface for a capacitive signal source
US9356567B2 (en) * 2013-03-08 2016-05-31 Invensense, Inc. Integrated audio amplification circuit with multi-functional external terminals
EP2879300A1 (en) * 2013-11-28 2015-06-03 AKG Acoustics GmbH Antenna system of a radio microphone
CN104066036A (zh) * 2014-06-19 2014-09-24 华为技术有限公司 拾音装置及拾音方法
US10182296B2 (en) * 2014-11-11 2019-01-15 Invensense, Inc. Secure audio sensor
CA2973142C (en) 2015-02-16 2018-02-06 Sound Devices, LLC High dynamic range analog-to-digital conversion with selective regression based data repair

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5710598A (en) * 1980-06-20 1982-01-20 Sony Corp Transmitting circuit of microphone output
JPS57193198A (en) * 1981-05-22 1982-11-27 Toshiba Corp Electrostatic microphone
SE452083C (sv) * 1983-02-25 1991-01-14 Rune Rosander Mikrofon
US4817153A (en) * 1988-03-14 1989-03-28 Canamex Corporation Method and apparatus for transforming a monaural signal into stereophonic signals
US5051799A (en) * 1989-02-17 1991-09-24 Paul Jon D Digital output transducer
FR2695277B1 (fr) * 1992-08-28 1994-10-07 Inst Francais Du Petrole Procédé et dispositif de transmission numérisée de signaux.
FI97001C (fi) * 1993-05-05 1996-09-25 Nokia Mobile Phones Ltd Kytkentä puhesignaalin käsittelemiseksi
US5386438A (en) * 1993-09-14 1995-01-31 Intel Corporation Analog front end integrated circuit for communication applications
DE4420713C2 (de) * 1994-06-14 1999-12-02 Stage Tec Entwicklungsgesellsc Vorrichtung zur Umwandlung analoger Audiosignale in einen digitalen Datenstrom

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1678135B (zh) * 2004-03-30 2012-06-20 Akg声学有限公司 幻象电源供电麦克风的远程控制方法

Also Published As

Publication number Publication date
ATE341920T1 (de) 2006-10-15
DK0794686T3 (da) 2007-02-05
US6028946A (en) 2000-02-22
DE19606261C2 (de) 1998-04-09
EP0794686A3 (de) 2002-09-25
EP0794686A2 (de) 1997-09-10
DE19606261A1 (de) 1997-08-14

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