EP1362497A1 - Microphone pourvu d'un telemetre - Google Patents

Microphone pourvu d'un telemetre

Info

Publication number
EP1362497A1
EP1362497A1 EP02700906A EP02700906A EP1362497A1 EP 1362497 A1 EP1362497 A1 EP 1362497A1 EP 02700906 A EP02700906 A EP 02700906A EP 02700906 A EP02700906 A EP 02700906A EP 1362497 A1 EP1362497 A1 EP 1362497A1
Authority
EP
European Patent Office
Prior art keywords
microphone
sound
circuitry
range finder
distance
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.)
Withdrawn
Application number
EP02700906A
Other languages
German (de)
English (en)
Inventor
Birger Orten
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.)
Meditron ASA
Original Assignee
Meditron ASA
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
Priority claimed from PCT/NO2001/000064 external-priority patent/WO2002000117A1/fr
Application filed by Meditron ASA filed Critical Meditron ASA
Publication of EP1362497A1 publication Critical patent/EP1362497A1/fr
Withdrawn legal-status Critical Current

Links

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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S15/00—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems
    • G01S15/88—Sonar systems specially adapted for specific applications
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
    • G01S17/88—Lidar systems specially adapted for specific applications
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R17/00—Piezoelectric transducers; Electrostrictive transducers
    • H04R17/02—Microphones

Definitions

  • the present invention relates to a microphone that comprises a microphone housing, an acoustoelectric transducer in a forward part of the housing for receiving sound from a sound emitter, as well as equipment for transferring sound-repre- senting signals from the transducer, out from the microphone to external sound signal processing equipment.
  • Microphones and in particular song microphones, often have a problem in the fact that the distance from the microphone to the sound emitter, for instance the mouth of an artist, influences the sound resulting from the microphone record- ing.
  • Microphones have various types of directional characteristics and various types of distance response, and often a manufacturer will undertake optimalization with regard to certain parameters, when making a microphone.
  • one special microphone will for example be intended to be used at a very close range, while some other microphone may be manufactured to pick up sound from a larger dis- tance.
  • a microphone that has been optimised for one certain type of use may provide a poor result when the use deviates somewhat from the originally intended use, and the result may be exaggerated S sounds, incorrect frequency response etc.
  • a microphone of a more flexible type i.e. a microphone that can easily be adjusted regarding optimalization parameters for varying distances to a sound emitter.
  • the present invention aims at solving this problem, and in accordance with the invention there is provided a microphone such as stated in the introduction, and which is characterized in that it is equipped with an element for measuring the distance to the sound emitter.
  • the element for measuring distance is included in the acoustoelectric transducer.
  • the transducer may then be constituted by elastic piezoelectric foils suspended in a surrounding frame and having a massive centre body, the centre body containing the element for measuring distance.
  • the element for measuring distance may be and ultrasound echo range finder.
  • the ultrasound echo range finder may comprise two piezoelectric elements, one for emitting a narrow ultrasound beam forwards toward the sound emitter, and one for receiving ultrasound echo from the sound emitter.
  • the element for measuring distance may be a laser range finder.
  • An inside compartment in the microphone housing may contain circuitry for generating, respectively interpreting signals to, respectively from the element for measuring distance.
  • Parts of the circuitry may be adapted for generating ultrasound oscillations for exciting a piezoelectric ultrasound transmitter element, and other parts of the circuitry may be operative for receiving and interpreting received signals from a piezoelectric ultrasound receiver element.
  • parts of the circuitry may be adapted for generating control signals for emitting light from a laser element in the element for measuring distance, and other parts of the circuitry may be operative for receiving and interpreting received reflection signals from a light detector in the distance measuring element.
  • the microphone in- eludes a circuit device for utilizing the measured distance, said circuit device having at least one function among a function group that comprises shutting down transfer of sound-representing signals from the microphone, adjusting a gain factor as a function of measured distance, and adjusting an equalizer setting as a function of measured distance.
  • the element for measuring distance and circuitry attached thereto are also adapted for sound detection through demodulation of a reflection signal from the sound emitter, said reflection signal, being a high frequency signal, receiving superposed sound modulation from the sound emitter and from ambient noise.
  • Fig. 1 shows a microphone in accordance with the invention, in an embodiment with a cable
  • Fig. 2 shows a microphone in accordance with the invention, with a wireless transmission system
  • Fig. 3 shows the same microphone as Fig. 1 , however without a microphone housing enclosure
  • Fig. 4 shows the top parts appearing from Fig. 3 in closer detail
  • Fig. 5 shows the sound transducer of the microphone.
  • Figs. 1 and 2 appear two embodiments of the microphone 1 in accordance with the invention, with transmission through a signal cable 2 (Fig. 1 ), respectively via a radio transmitter 3 and antenna 4 (Fig. 2).
  • Fig. 1 signal cable 2
  • Fig. 2 radio transmitter 3 and antenna 4
  • Fig. 3 radio transmitter 3 and antenna 4
  • Fig. 3 appears a microphone that corresponds to the one shown in Fig. 1 , however without an outer microphone housing 5 (Fig. 1 , Fig. 2).
  • the same microphone top 6 as in Fig. 1 and Fig. 2 appears also in Fig. 3 and Fig. 4, but these figures show an acoustoelectric transducer 7, shown in better detail in Fig. 5.
  • the primary function of the transducer 7 is of course picking up sound vibrations transferred through the air from a sound emitter, for example from the mouth of an artist, and further transferred through the grill-shaped microphone top 6.
  • the transducer 7 as shown has an outer frame 8, and supported rigidly therein via beams 9, an inner frame 10.
  • piezo-elements 15, 16 have been laid in, i.e. one piezo-element 15 for transmitting vibrations, and one piezo-element 16 for receiving reflected vibrations.
  • Signal wires to/from the piezo-elements of the centre body do not appear in Fig. 5, however they follow paths on sectors 11 from the centre body 16 and out to signal wires 17 appearing in the figure.
  • the piezo-elements 15 and 16 are in this case cast-in "half moons" of a piezo-material. The manner of operation will be e.g.
  • the centre body piezo-element 15 transmits high-frequency vibrations, preferably in the range 5-10 MHz (however not limited to such a range), in order to make an echo sounder measurement, possibly an echo Doppler investigation for more precise examination of the movement mode of the sound emitter.
  • the ultrasound beam that is transmitted from the centre body can be very narrow and directional, and may for example pass centrally out through the microphone top 6, i.e. through a special centre hole.
  • the two "crescent shaped" piezo-elements 15 and 16 can also have a parabolic or approximately parabolic curvature, to achieve transmission of a narrow beam, and for correspondingly directional reception.
  • the different sectors of the sound receiving element with piezo-foils 11 can also be used both for transmission and reception, however this is of less interest in a microphone embodiment.
  • the separate sectors provide mainly possibilities for electronic signal combinations, in order to cancel out noise.
  • a system of stays 18 provides support for a tightening screw 19 that, when operated, is able to pull the centre body 13 some distance in a downwards direction, so as to impart a downward slanting position toward the centre body 13, for the foil sectors 11 inside centre frame 10, thereby giving the whole active part of the transducer a somewhat more "parabolic" shape, and hence more directional.
  • the centre screw 19 constitutes a stiff coupling all the way up to the centre body 13 on the underside, only with a possibility for ac- commodating rotation, the centre body 13 is locked with regard to vibration in a vertical direction, and the foil sectors 11 will then only be able to vibrate between such a fixed centre body 13 and a fixed inner frame 10. But if a link between the tightening screw 19 and the centre body 13 is equipped with an elastic part, the whole system of foil sectors and the centre body will still have a vibrational mode in the vertical direction, however modified by the influence of the elastic link.
  • Signals to/from the active elements 11 , 15, 16 in the transducer are forwar- ded along signal wires 14, 17 (Fig. 5), as mentioned, and further to/from the base unit 20 shown in Fig. 3.
  • This base unit 20 may contain signal processing equipment, for example an A D converter, a controllable/programmable equalizer, amplifier and other equipment.
  • the microphone is of a type with cable attachment.
  • the base part 20 will preferably contain a power source in the form of a battery, which power source will also be necessary for operating possible other circuitry as mentioned above, and in the case with wireless transfer to external equipment (Fig. 2), also for operating a radio transmitter/receiver in unit 3 (Fig. 2). Furthermore, the circuitry for interpretation of range finding signals will be operative for utilization of the measurement result, for example by shutting down transfer of sound-representing signals from the microphone if the distance to the sound emitter exceeds a certain predefined threshold value.
  • the centre body with its range finding system also has a double function.
  • the high frequency ultrasound signal that is transmitted from element 15 to be reflected from the sound emitter, after reflection also will receive a slower vibration as a superposition, namely the sound of interest from the sound emitter, and possibly also some noise from the surroundings.
  • These slow sound vibrations can be separated from the high frequency oscillations, by means of signal processing, and they can be used as a basis for signal processing for the sound vibrations that are also picked up through the foil sectors 11 , and in particular with regard to cancelling noise and undesired sounds from the sound signals.
  • the circuitry in base element 20 can also be adapted for such a function.
  • range finder is a device utilizing a laser beam, and it is possible to incorporate a small laser diode, possibly with micro-optics, in the same position as the unit shown in Fig. 5, namely in the actual centre body 13.
  • a laser beam preferably using infrared light, is then emitted through a corresponding opening in the microphone top 6, to be reflected from the sound emitter and back to a light detector arranged together with the laser.
  • Such a laser range finder can also be arranged in some other place on the microphone, for instance peripherally. (Such a range finder can be retrofit equipment.) How- ever, for obvious reasons a central position will be preferable.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Acoustics & Sound (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • General Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Signal Processing (AREA)
  • Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
  • Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)
  • Circuit For Audible Band Transducer (AREA)
  • Traffic Control Systems (AREA)
  • Pens And Brushes (AREA)
  • Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
  • Transducers For Ultrasonic Waves (AREA)

Abstract

La présente invention concerne un microphone, pourvu d'un élément (13) servant à mesurer la distance qui s'étend jusqu'à un émetteur sonore, tel que le visage d'un artiste. L'élément (13) de mesure de la distance peut être compris dans le transducteur acousto-électrique (7) du microphone, et il peut s'agir d'un télémètre (15, 16) à échos d'ultrasons piézo-électrique.
EP02700906A 2001-02-21 2002-02-20 Microphone pourvu d'un telemetre Withdrawn EP1362497A1 (fr)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
WOPCT/NO01/00064 2001-02-21
PCT/NO2001/000064 WO2002000117A1 (fr) 2000-06-23 2001-02-21 Transducteur mecano-electrique bidirectionnel
NO20015985A NO316560B1 (no) 2001-02-21 2001-12-06 Mikrofon med avstandsmåler
NO20015985 2001-12-06
PCT/NO2002/000071 WO2002074010A1 (fr) 2001-02-21 2002-02-20 Microphone pourvu d'un telemetre

Publications (1)

Publication Number Publication Date
EP1362497A1 true EP1362497A1 (fr) 2003-11-19

Family

ID=26649028

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02700906A Withdrawn EP1362497A1 (fr) 2001-02-21 2002-02-20 Microphone pourvu d'un telemetre

Country Status (6)

Country Link
EP (1) EP1362497A1 (fr)
JP (1) JP2004526150A (fr)
CN (1) CN1628485A (fr)
CA (1) CA2439087A1 (fr)
NO (1) NO316560B1 (fr)
WO (1) WO2002074010A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NO20015982A (no) * 2001-12-06 2003-04-07 Meditron Asa Mikrofon
NO314558B1 (no) * 2001-12-06 2003-04-07 Meditron Asa Sangmikrofon
US10057706B2 (en) * 2014-11-26 2018-08-21 Sony Interactive Entertainment Inc. Information processing device, information processing system, control method, and program
US9877114B2 (en) * 2015-04-13 2018-01-23 DSCG Solutions, Inc. Audio detection system and methods
CN110572759B (zh) * 2019-08-30 2020-12-15 Oppo广东移动通信有限公司 电子设备

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1066823B (it) * 1975-12-30 1985-03-12 Sits Soc It Telecom Siemens Trasduttore elettroacustico particolarmente del tipo a lamina piezoceramica
US4586195A (en) * 1984-06-25 1986-04-29 Siemens Corporate Research & Support, Inc. Microphone range finder
US4638207A (en) * 1986-03-19 1987-01-20 Pennwalt Corporation Piezoelectric polymeric film balloon speaker
US4727279A (en) * 1987-04-29 1988-02-23 General Motors Corporation Piezoelectric knock sensor
GB9314822D0 (en) * 1993-07-17 1993-09-01 Central Research Lab Ltd Determination of position
US5901232A (en) * 1996-09-03 1999-05-04 Gibbs; John Ho Sound system that determines the position of an external sound source and points a directional microphone/speaker towards it
DE19943872A1 (de) * 1999-09-14 2001-03-15 Thomson Brandt Gmbh Vorrichtung zur Anpassung der Richtcharakteristik von Mikrofonen für die Sprachsteuerung

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO02074010A1 *

Also Published As

Publication number Publication date
CN1628485A (zh) 2005-06-15
JP2004526150A (ja) 2004-08-26
NO20015985D0 (no) 2001-12-06
NO316560B1 (no) 2004-02-02
CA2439087A1 (fr) 2002-09-19
WO2002074010A1 (fr) 2002-09-19
NO20015985L (no) 2002-08-22

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