利索-全球专利检索

  1. 登录
  2. 注册
发明公开
CN104980846A 降低电嘶嘶声的ANC主动噪声控制音频头戴式耳机 无效 - 撤回 转让

降低电嘶嘶声的ANC主动噪声控制音频头戴式耳机
摘要：
头戴式耳机，包括主动噪声控制系统，其具有递送包括声音噪声分量的信号的ANC话筒。数字信号处理器DSP(50)，其包括向由该ANC话筒拾取的信号应用滤波传递函数(HFB)的反馈ANC支路(54)，以及用于将该反馈支路的信号与要被重现的音频信号(M)进行混合的装置(46)。该ANC话筒是置于该声腔(22)内部的内部话筒(28)，并且该反馈ANC滤波器(54)是多个能选择性切换的、预先配置的反馈ANC滤波器中的一个。该DSP(50)包括用于验证该话筒信号的当前特性是否满足预定准则集、并且用于根据此验证的结果来选择该预先配置的反馈ANC滤波器之一的装置(62)。根据当前选择的反馈ANC滤波器，还修改均衡支路(58)对要被重现的信号(M)的滤波(HEQ)。
摘要（英）：

A headset includes an active noise control system, with an ANC microphone delivering a signal including an acoustic noise component. A digital signal processor DSP (50) comprises a feedback ANC branch (54) applying a filtering transfer function (HFB) to the signal picked up by the ANC microphone, and means (46) for mixing the signal of the feedback branch with an audio signal to be reproduced (M). The ANC microphone is an internal microphone (28) placed inside the acoustic cavity (22), and the feedback ANC filter (54) is one between a plurality of selectively switchable, pre-configured feedback ANC filter. The DSP (50) comprises means (62) for verifying whether current characteristics of the microphone signal fulfil or not a set of predetermined criteria, and for selecting one of the pre-configured feedback ANC filters as a function of the result of this verification. The filtering (HEQ) of an equalization branch (58) of the signal to be reproduced (M) is also modified as a function of the current selected feedback ANC filter.

0/0