发明名称 |
Frequency-dependent ANR reference sound compression |
摘要 |
An active noise reduction (ANR) circuit includes a digital feed-forward ANR pathway coupled to a feed-forward microphone, to detect environmental sounds in an environment external to a casing, and to a first acoustic driver to output sounds within the casing. The digital feed-forward ANR pathway applies a plurality of filters using a first set of coefficients to convert signals from the feed-forward microphone to feed-forward anti-noise sounds to reduce environmental sounds within the casing. In response to a stimulus, the digital feed-forward ANR pathway applies the plurality of filters using a second set of coefficients, which reduce the degree of feed-forward ANR to enable human speech sounds in the environment external to the casing to be conveyed from the feed-forward microphone to the acoustic driver with less reduction than provided by the first plurality of filters. |
申请公布号 |
US9123320(B2) |
申请公布日期 |
2015.09.01 |
申请号 |
US201313962205 |
申请日期 |
2013.08.08 |
申请人 |
Bose Corporation |
发明人 |
Carreras Ricardo F.;Gauger, Jr. Daniel M.;Joho Marcel |
分类号 |
G10K11/00;G10L21/0208 |
主分类号 |
G10K11/00 |
代理机构 |
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代理人 |
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主权项 |
1. An active noise reduction (ANR) circuit comprising:
a digital feed-forward ANR pathway coupled to a feed-forward microphone, to detect environmental sounds in an environment external to a casing, and coupled to a first acoustic driver to output sounds within the casing; and a user input; wherein the digital feed-forward ANR pathway applies a filter using a first set of coefficients to convert signals from the feed-forward microphone to feed-forward anti-noise sounds to reduce environmental sounds within the casing, and in response to activation of the user input, the digital feed-forward ANR pathway applies the filter using a second set of coefficients, the second set of coefficients reducing the degree of feed-forward ANR to enable human speech sounds in the environment external to the casing to be conveyed from the feed-forward microphone to the acoustic driver with less reduction than provided by the first set of coefficients. |
地址 |
Framingham MA US |