EP0966178A3 - Digital electro-acoustic transducer - Google Patents

Digital electro-acoustic transducer Download PDF

Info

Publication number
EP0966178A3
EP0966178A3 EP99304612A EP99304612A EP0966178A3 EP 0966178 A3 EP0966178 A3 EP 0966178A3 EP 99304612 A EP99304612 A EP 99304612A EP 99304612 A EP99304612 A EP 99304612A EP 0966178 A3 EP0966178 A3 EP 0966178A3
Authority
EP
European Patent Office
Prior art keywords
units
circuit
output
unit
preamplifier
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.)
Granted
Application number
EP99304612A
Other languages
German (de)
French (fr)
Other versions
EP0966178A2 (en
EP0966178B1 (en
Inventor
Yoshinobu Yasuno
Yasuhiro Riko
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.)
Riko Yasuhiro
Panasonic Holdings Corp
Original Assignee
Riko Yasuhiro
Matsushita Electric Industrial Co Ltd
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 Riko Yasuhiro, Matsushita Electric Industrial Co Ltd filed Critical Riko Yasuhiro
Publication of EP0966178A2 publication Critical patent/EP0966178A2/en
Publication of EP0966178A3 publication Critical patent/EP0966178A3/en
Application granted granted Critical
Publication of EP0966178B1 publication Critical patent/EP0966178B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • 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
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/005—Details of transducers, loudspeakers or microphones using digitally weighted transducing elements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R5/00—Stereophonic arrangements
    • H04R5/033—Headphones for stereophonic communication

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Circuit For Audible Band Transducer (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)
  • Piezo-Electric Transducers For Audible Bands (AREA)
  • Telephone Function (AREA)
  • Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)

Abstract

A digital electro-acoustic transducer for improving the speech quality of sound under noisy circumstances is disclosed. A plurality of sound generating units A (22) constituted by electrostatic electro-acoustic transducers (condenser earphones) and a sound receiving unit B (23) constituted by an electrostatic acousto-electric transducer (condenser microphone) are disposed in a cavity of a soundproof housing (21). The units A (22) are provided in a feedback loop and an output level of the unit B (23) is adjusted by an preamplifier (24). An output of the preamplifier is sampled by a sample-and-hold circuit (25) and an output thereof is delta-modulated by a delta modulation circuit (26). The number of pulses produced by the circuit (26) is subjected to arithmetic operation in an arithmetic circuit (27) to produce a drive signal for the units A. Vibration of a vibration film of the unit B (23) is detected and arithmetical control is made to be always maintained to zero. On the other hand, an audio signal supplied from a signal terminal (28) is superposed on a drive signal for the units A and is emitted into the cavity.
EP19990304612 1998-06-18 1999-06-14 Digital electro-acoustic transducer Expired - Lifetime EP0966178B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP17186598 1998-06-18
JP17186598A JP3553375B2 (en) 1998-06-18 1998-06-18 Noise-proof digital handset

Publications (3)

Publication Number Publication Date
EP0966178A2 EP0966178A2 (en) 1999-12-22
EP0966178A3 true EP0966178A3 (en) 2001-03-21
EP0966178B1 EP0966178B1 (en) 2004-05-26

Family

ID=15931230

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19990304612 Expired - Lifetime EP0966178B1 (en) 1998-06-18 1999-06-14 Digital electro-acoustic transducer

Country Status (4)

Country Link
EP (1) EP0966178B1 (en)
JP (1) JP3553375B2 (en)
CN (1) CN1173599C (en)
DE (1) DE69917531T2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3642460B2 (en) * 1998-12-07 2005-04-27 松下電器産業株式会社 Digital handset

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4370523A (en) * 1980-05-28 1983-01-25 Baeder Karl O Process and apparatus for converting sound waves into digital electrical signals
US4922542A (en) * 1987-12-28 1990-05-01 Roman Sapiejewski Headphone comfort
WO1997036454A1 (en) * 1996-03-27 1997-10-02 Georg Neumann Gmbh Process and arrangement for converting an acoustic signal to an electrical signal

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4370523A (en) * 1980-05-28 1983-01-25 Baeder Karl O Process and apparatus for converting sound waves into digital electrical signals
US4922542A (en) * 1987-12-28 1990-05-01 Roman Sapiejewski Headphone comfort
WO1997036454A1 (en) * 1996-03-27 1997-10-02 Georg Neumann Gmbh Process and arrangement for converting an acoustic signal to an electrical signal

Also Published As

Publication number Publication date
JP2000013890A (en) 2000-01-14
EP0966178A2 (en) 1999-12-22
CN1241107A (en) 2000-01-12
DE69917531D1 (en) 2004-07-01
CN1173599C (en) 2004-10-27
JP3553375B2 (en) 2004-08-11
DE69917531T2 (en) 2005-08-04
EP0966178B1 (en) 2004-05-26

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