Global Patent Index - EP 0744881 A3

EP 0744881 A3 19990609 - Headphone reproducing apparatus

Title (en)

Headphone reproducing apparatus

Title (de)

Kopfhörer-Wiedergabegerät

Title (fr)

Appareil de reproduction par casque d'écoute

Publication

EP 0744881 A3 19990609 (EN)

Application

EP 96303604 A 19960521

Priority

JP 14832395 A 19950522

Abstract (en)

[origin: EP0744881A2] A headphone reproducing apparatus creates a virtual sound. A listener feels as if a sound came from a virtual sound source that imaginarily exists in a space apart from the listener. A delay circuit delays a first-channel input audio signal and a second-channel input audio signal by predetermined delay times. A low-pass filter changes frequency characteristics of the first- and second-channel input signals to predetermined frequency characteristics. A multiplier changes sound levels of the first- and second-channel input audio signals to predetermined sound levels. The delay circuit, low-pass filter, and multiplier are connected in series to each other. A headphone reproduces the first- and second-channel input signals processed by the delay circuit, low-pass filter, and multiplier as the sound that comes from the virtual sound source. <IMAGE>

IPC 1-7

H04R 5/033

IPC 8 full level

H04R 3/00 (2006.01); H04R 5/033 (2006.01)

CPC (source: EP)

H04S 5/00 (2013.01); H04S 7/304 (2013.01); H04S 2420/01 (2013.01)

Citation (search report)

  • [YA] GB 2220818 A 19900117 - HENRY GARY KEITH
  • [YA] FR 2296340 A1 19760723 - MATSUSHITA ELECTRIC IND CO LTD [JP]
  • [A] EP 0464217 A1 19920108 - SONY CORP [JP]
  • [Y] PATENT ABSTRACTS OF JAPAN vol. 8, no. 44 (E - 229) 25 February 1984 (1984-02-25)
  • [Y] PATENT ABSTRACTS OF JAPAN vol. 14, no. 520 (E - 1002) 14 November 1990 (1990-11-14)
  • [A] PATENT ABSTRACTS OF JAPAN vol. 18, no. 333 (P - 1759) 23 June 1994 (1994-06-23)

Designated contracting state (EPC)

DE FR GB

DOCDB simple family (publication)

EP 0744881 A2 19961127; EP 0744881 A3 19990609; EP 0744881 B1 20040714; CN 1108083 C 20030507; CN 1140968 A 19970122; DE 69632889 D1 20040819; DE 69632889 T2 20050721; MY 124476 A 20060630; SG 89238 A1 20020618

DOCDB simple family (application)

EP 96303604 A 19960521; CN 96108997 A 19960522; DE 69632889 T 19960521; MY PI19961922 A 19960522; SG 1996009852 A 19960522