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1. (WO1992010918) SIGNAL PROCESSOR FOR RECREATING ORIGINAL AUDIO SIGNALS
Latest bibliographic data on file with the International Bureau

Pub. No.: WO/1992/010918 International Application No.: PCT/US1991/009375
Publication Date: 25.06.1992 International Filing Date: 13.12.1991
Chapter 2 Demand Filed: 13.07.1992
IPC:
H04R 3/04 (2006.01) ,H04S 1/00 (2006.01)
H ELECTRICITY
04
ELECTRIC COMMUNICATION TECHNIQUE
R
LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
3
Circuits for transducers
04
for correcting frequency response
H ELECTRICITY
04
ELECTRIC COMMUNICATION TECHNIQUE
S
STEREOPHONIC SYSTEMS
1
Two-channel systems
Applicants:
BYRD, Eldon, A. [US/US]; US
Inventors:
BYRD, Eldon, A.; US
Agent:
HOLMES, John, E. ; Venable, Baetjer, Howard & Civiletti 1201 New York Avenue, N.W., Suite 1000 Washington, DC 20005, US
Priority Data:
627,76714.12.1990US
793,90820.11.1991US
Title (EN) SIGNAL PROCESSOR FOR RECREATING ORIGINAL AUDIO SIGNALS
(FR) PROCESSEUR DE SIGNAUX RECREANT DES SIGNAUX AUDIO ORIGINAUX
Abstract:
(EN) An audio signal processor (10, 12, 14) is disclosed for correcting harmonic and phase inaccuracies caused by the transduction, recording and playback of live audio signals. Operational amplifiers with fast slew rates and large bandwiths are used to implement a simple but effective circuit that can be reduced to a single chip. Signal phase is continuously and automatically shifted as a logarithmic function of frequency to compensate for differences in propagation velocities, thereby reducing the spatial smear that is inherent in conventional loudspeaker designs. Harmonic frequencies present during a live performance are regenerated by the signal processor to restore realism to the reproduced audio signal.
(FR) Processeur (10, 12, 14) de signaux audio permettant de corriger des imprécisions d'harmonique et de phase provoquées par la transduction, l'enregistrement et la lecture de signaux audio en direct. On utilise des amplificateurs opérationnels à vitesses de balayage rapides et à grandes largeurs de bande afin de constituer un circuit simple mais efficace pouvant se réduire à une seule puce. Une phase de signal est décalée en continu et automatiquement sous forme d'une fonction logarithmique de fréquence afin de compenser les différences dans les vitesses de propagation, réduisant ainsi la déformation spatiale inhérente au haut-parleur de conception classique. Les fréquences harmoniques se produisant lors d'une représentation en direct sont régénérées par le processeur de signaux afin de restituer le réalisme au signal audio reproduit.
Designated States: AT, AU, BB, BG, BR, CA, CH, CS, DE, DK, ES, FI, GB, HU, JP, KP, KR, LK, LU, MG, MN, MW, NL, NO, PL, RO, SD, SE, SU
European Patent Office (AT, BE, CH, DE, DK, ES, FR, GB, GR, IT, LU, MC, NL, SE)
African Intellectual Property Organization (BF, BJ, CF, CG, CI, CM, GA, GN, ML, MR, SN, TD, TG)
Publication Language: English (EN)
Filing Language: English (EN)
Also published as:
CA2098319AU1991091160