Global Patent Index - EP 0966178 A3

EP 0966178 A3 2001-03-21 - Digital electro-acoustic transducer

Title (en)

Digital electro-acoustic transducer

Title (de)

Digitaler elektroakustischer Wandler

Title (fr)

Transducteur électroacoustique digital

Publication

EP 0966178 A3 (EN)

Application

EP 99304612 A

Priority

JP 17186598 A

Abstract (en)

[origin: EP0966178A2] 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. <IMAGE>

IPC 1-7 (main, further and additional classification)

H04R 1/00; G10K 11/178; H04R 1/10

IPC 8 full level (invention and additional information)

H04R 17/00 (2006.01); H04M 1/00 (2006.01); H04R 1/00 (2006.01); H04R 5/033 (2006.01)

CPC (invention and additional information)

H04R 19/00 (2013.01); H04R 1/005 (2013.01); H04R 5/033 (2013.01)

Citation (search report)

Designated contracting state (EPC)

AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE

EPO simple patent family

EP 0966178 A2 19991222; EP 0966178 A3 20010321; EP 0966178 B1 20040526; CN 1173599 C 20041027; CN 1241107 A 20000112; DE 69917531 D1 20040701; DE 69917531 T2 20050804; JP 2000013890 A 20000114; JP 3553375 B2 20040811

INPADOC legal status


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2005-05-18 [26N] NO OPPOSITION FILED

- Effective date: 20050301

2004-12-31 [ET] FR: TRANSLATION FILED

2004-07-01 [REF] CORRESPONDS TO:

- Document: DE 69917531 P 20040701

2004-05-26 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: B1

- Designated State(s): DE FR GB

2004-05-26 [REG GB FG4D] EUROPEAN PATENT GRANTED

2002-09-11 [17Q] FIRST EXAMINATION REPORT

- Effective date: 20020725

2001-12-12 [AKX] PAYMENT OF DESIGNATION FEES

- Free text: DE FR GB

2001-10-17 [17P] REQUEST FOR EXAMINATION FILED

- Effective date: 20010823

2001-03-21 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: A3

- Designated State(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE

2001-03-21 [AX] REQUEST FOR EXTENSION OF THE EUROPEAN PATENT TO

- Free text: AL;LT;LV;MK;RO;SI

2001-03-21 [RIC1] CLASSIFICATION (CORRECTION)

- Free text: 7H 04R 1/00 A, 7H 04R 1/10 B, 7G 10K 11/178 B

2000-03-15 [K1C1] CORRECTION OF PATENT APPLICATION (TITLE PAGE) PUBLISHED

- Effective date: 19991222

2000-03-15 [RAP1] TRANSFER OF RIGHTS OF AN EP PUBLISHED APPLICATION

- Owner name: MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.

2000-03-15 [RAP1] TRANSFER OF RIGHTS OF AN EP PUBLISHED APPLICATION

- Owner name: RIKO, YASUHIRO

1999-12-22 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: A2

- Designated State(s): DE FR GB

1999-12-22 [AX] REQUEST FOR EXTENSION OF THE EUROPEAN PATENT TO

- Free text: AL;LT;LV;MK;RO;SI