EP0065810A3 - Travelling wave electrical/acoustic transducer system and a microphone and loudspeaker incorporating such a system - Google Patents

Travelling wave electrical/acoustic transducer system and a microphone and loudspeaker incorporating such a system

Info

Publication number
EP0065810A3
EP0065810A3 EP82300302A EP82300302A EP0065810A3 EP 0065810 A3 EP0065810 A3 EP 0065810A3 EP 82300302 A EP82300302 A EP 82300302A EP 82300302 A EP82300302 A EP 82300302A EP 0065810 A3 EP0065810 A3 EP 0065810A3
Authority
EP
European Patent Office
Prior art keywords
acoustic
electrical
transducer
stages
acoustic transducer
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Withdrawn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
EP82300302A
Other languages
German (de)
French (fr)
Other versions
EP0065810A2 (en
Inventor
Terry D. Beard
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.)
BEARD, TERRY D.
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP0065810A2 publication Critical patent/EP0065810A2/en
Publication of EP0065810A3 publication Critical patent/EP0065810A3/en
Withdrawn legal-status Critical Current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
    • H04R3/005—Circuits for transducers, loudspeakers or microphones for combining the signals of two or more microphones
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
    • H04R1/32—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only
    • H04R1/40—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by combining a number of identical transducers
    • 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
    • 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
    • H04R3/12—Circuits for transducers, loudspeakers or microphones for distributing signals to two or more loudspeakers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2440/00—Bending wave transducers covered by H04R, not provided for in its groups
    • H04R2440/01—Acoustic transducers using travelling bending waves to generate or detect sound

Landscapes

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

Abstract

A high efficiency electrical/acoustic transducer system formed from a plurality of electrical/acoustic transducer stages (6, 26, 8; 8, 28, 10; etc.) electrically and mechanically connected in succession to propagate electric and acoustic signals through the successive stages. An inductance net­ work (L/2, L, L, L, L/2) is connected in circuit with the transducer (6, 26, 8; 8, 28, 10; etc.) stages to slow the electrical signal propagation speed through the system to a speed which is substantially synchronous with the acoustic signal propagation speed, enabling the travelling electrical and acoustic waves to interact and to efficiently transform one form of energy into the other. In the preferred embodi­ ment a plurality of acoustically transparent screens (6, 8, 10, 12, 14, 16, 18, 20, 22) form the transducer plates, each successive stage sharing a screen (8, 10, 12, 14, 16, 18, 20) in common with the previous stage, and the inductance network renders the input impedance substantially resistive. The invention is applicable to both acoustic speakers and microphones.
EP82300302A 1981-05-15 1982-01-21 Travelling wave electrical/acoustic transducer system and a microphone and loudspeaker incorporating such a system Withdrawn EP0065810A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US26401181A 1981-05-15 1981-05-15
US264011 1988-10-28

Publications (2)

Publication Number Publication Date
EP0065810A2 EP0065810A2 (en) 1982-12-01
EP0065810A3 true EP0065810A3 (en) 1983-07-20

Family

ID=23004179

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82300302A Withdrawn EP0065810A3 (en) 1981-05-15 1982-01-21 Travelling wave electrical/acoustic transducer system and a microphone and loudspeaker incorporating such a system

Country Status (2)

Country Link
EP (1) EP0065810A3 (en)
JP (1) JPS57192195A (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4872148A (en) * 1984-03-08 1989-10-03 Polaroid Corporation Ultrasonic transducer for use in a corrosive/abrasive environment
GB0317331D0 (en) * 2003-07-24 2003-08-27 New Transducers Ltd Acoustic device
US8971547B2 (en) * 2009-01-08 2015-03-03 Harman International Industries, Incorporated Passive group delay beam forming
JP2014150337A (en) * 2013-01-31 2014-08-21 Yamaha Corp Electrostatic speaker
US9955260B2 (en) 2016-05-25 2018-04-24 Harman International Industries, Incorporated Asymmetrical passive group delay beamforming

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1978200A (en) * 1930-03-24 1934-10-23 Bell Telephone Labor Inc Electrostatic acoustic device
US1983377A (en) * 1929-09-27 1934-12-04 Gen Electric Production of sound
US2496031A (en) * 1947-12-30 1950-01-31 Rca Corp Dual microphone sound detector system
US3136867A (en) * 1961-09-25 1964-06-09 Ampex Electrostatic transducer
JPS5241524A (en) * 1975-09-29 1977-03-31 Sony Corp Condenser speaker driver

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1983377A (en) * 1929-09-27 1934-12-04 Gen Electric Production of sound
US1978200A (en) * 1930-03-24 1934-10-23 Bell Telephone Labor Inc Electrostatic acoustic device
US2496031A (en) * 1947-12-30 1950-01-31 Rca Corp Dual microphone sound detector system
US3136867A (en) * 1961-09-25 1964-06-09 Ampex Electrostatic transducer
JPS5241524A (en) * 1975-09-29 1977-03-31 Sony Corp Condenser speaker driver

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENTS ABSTRACTS OF JAPAN *
PATENTS ABSTRACTS OF JAPAN, vol. 1, no. 108, 22nd September 1977, page 3797 E 77; & JP - A - 52 41 524 (SONY K.K.) (31-03-1977) *

Also Published As

Publication number Publication date
JPS57192195A (en) 1982-11-26
EP0065810A2 (en) 1982-12-01

Similar Documents

Publication Publication Date Title
EP0342782A3 (en) Electroacoustic system with electronic filters
DK0412902T3 (en) Electroacoustic device for hearing impaired containing noise balancing
DK222387D0 (en) STEREOPHONIC SPEAKER PLATE OR SPEAKER CABINET
KR930015319A (en) Surface acoustic wave filter
EP0065810A3 (en) Travelling wave electrical/acoustic transducer system and a microphone and loudspeaker incorporating such a system
US3722617A (en) Flat diaphragm for sound transducers
US7099488B2 (en) Planar speaker wiring layout
EP0353092A2 (en) Apparatus and method for reproducing high fidelity sound
GB1381912A (en) Acoustic wave devices
JPS55121793A (en) Speaker system
JPS5431702A (en) Binaural stereo reproduction circuit
CN208509257U (en) Loudspeaker and sound box system
US3889058A (en) Telephone systems with reduced acoustic feedback
JPS6429094A (en) Echo erasing device
Leach Jr On the electroacoustic-analogous circuit for a plane wave incident on the diaphragm of a free-field pressure microphone
FR2274171A1 (en) Frequency filter using acoustic surface wave techniques - supplementary electrodes reduce capacity coupling between input and output
GB666868A (en) Loudspeaking telephone system
Kobayashi A transducer for blood flow noise from intracranial vascular deformations
JPS597832Y2 (en) Speaker system with multiple electrodynamic speakers
CN2154576Y (en) Speech sounds sensor
JPS5784611A (en) Surface acoustic wave filter
JPS5648796A (en) Headphone
JPS63276100A (en) Noise control system
Hudson Numerical models used in design and analysis of volumetric transducer arrays
JPS6457899A (en) Microphone and speaker

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 LU 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 LU NL SE

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: BEARD, TERRY D.

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

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19840321