Acoustic characteristic adjustment device

• Main Authors: TOYODA KUNIO, OSHIMA MORIYUKI, NAKAZATO MITSUO, SHIMIZU AKIRA, KATO SHINJIRO, KOBAYASHI SHIGEKI, TAKANO KOJI, ENDO TOMOHIKO, HINO SHOKICHIRO, TSUCHIYA KOUICHI
• Format: Patent
• Language: English
• Published: 04.08.2005
• Edition: 7
• Subjects: BASIC ELECTRONIC CIRCUITRY; DEAF-AID SETS; ELECTRIC COMMUNICATION TECHNIQUE; ELECTRICITY; IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKEACOUSTIC ELECTROMECHANICAL TRANSDUCERS; PUBLIC ADDRESS SYSTEMS; RESONATORS; STEREOPHONIC SYSTEMS

An improved acoustic characteristic adjustment device comprises signal processing units including high frequency convolution arithmetic sections, low frequency convolution arithmetic sections, and delay sections. The device further comprises: an operation section from which a listener inputs a target characteristic in order to adjust a desired acoustic characteristic; an impulse characteristic control section; and a delay time control section. The impulse characteristic control section calculates impulse response data to effect convolution arithmetics. The delay time control section calculates alignment delay times necessary for sounds emitted from the speakers to reach a listening position. The delay time control section also calculates correction times for compensating various phase deviations. Times obtained by correcting the alignment delay times with the correction times are set as the delay times of the delay sections, respectively.