首页>
外国专利>
SYSTÈME DE COMMANDE ACTIVE DU BRUIT, PROCÉDÉ DE RÉGLAGE DE COMMANDE ACTIVE DU BRUIT ET SYSTÈME AUDIO
SYSTÈME DE COMMANDE ACTIVE DU BRUIT, PROCÉDÉ DE RÉGLAGE DE COMMANDE ACTIVE DU BRUIT ET SYSTÈME AUDIO
展开▼
展开▼
页面导航
摘要
著录项
相似文献
摘要
Provided are "an active noise control system (1), a setting method of the active noise control system (1), and an audio system (3)" that cancel a plurality of noises.Two subsystems, each including a microphone (12, 14), a speaker (13, 15), a canceling sound-generating adder (1118, 1128), an error-computing adder (1117, 1127), and two adaptive filters W (1113 and 1114, 1123 and 1124, 1115 and 1116, 1125 and 1126) and two auxiliary filters H (1111, 1121, 1112, 1122) that accept two noises as input, are provided in correspondence with two cancellation positions. Each canceling sound-generating adder (1118, 1128) adds together the outputs from the adaptive filters (1113 and 1114, 1123 and 1124, 1115 and 1116, 1125 and 1126) and outputs the result to the speaker (13, 15) of each subsystem. Each error-computing adder (1117, 1127) adds together the output from the microphone (12, 14) of the subsystem and the output from the auxiliary filter (1111, 1121, 1112, 1122) of the subsystem, and the result is treated as the error of the adaptive filters (1113 and 1114, 1123 and 1124, 1115 and 1116, 1125 and 1126) of each subsystem. A transfer function is learned in advance and set in each auxiliary filter (1111, 1121, 1112, 1122) such that each error computed by each error-computing adder (1117, 1127) becomes 0 when a transfer function in which each noise is canceled at each cancellation position in a predetermined standard acoustic environment is set in each adaptive filter (1113 and 1114, 1123 and 1124, 1115 and 1116, 1125 and 1126).
展开▼
