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Pre-shaping series filter for active noise cancellation adaptive filter
Pre-shaping series filter for active noise cancellation adaptive filter
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机译:预成形系列滤波器,用于有源噪声消除自适应滤波器
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摘要
A feed forward active noise cancellation (ANC) system for use in a portable audio device has an adaptive digital filter and a reference microphone. A non-adaptive pre-shaping digital filter has an input coupled to the reference microphone and is in series with, and in front of, the adaptive filter. The pre-shaping filter is minimum phase and presents at least 2 dB more gain over a low audio frequency band than over a high audio frequency band. This may help compensate for low frequency band difficulties, and may thereby extend ANC bandwidth at the low end without a worsening impact on the high end. Other embodiments are also described and claimed.
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