发明名称 |
ADAPTIVE DIGITAL NOISE CANCELLER |
摘要 |
Systems and methods for adaptive feed- forward noise cancellation. The system includes a plurality of reference microphones (105), an error microphone (125), a secondary path module (135), an adaptation controller (140), and a canceller filter (145). A finite impulse response ("FIR") based plant model is converted to an infinite impulse response ("HR") based plant model using balanced model reduction. Due to the inherent instability of the adaptive HR filter, the Schur-Cohn stability test is applied to the denominator coefficients of the HR filter transfer function to determine the stability of the noise cancellation system. A secondary path of the noise cancellation system is identified in an on-line manner in the secondary path module (135). If the energy level of the communication signal (e.g., a music signal) is strong, secondary path identification is performed. The adaptation controller (140) controls the updating of the HR transfer function based on the stability determination and the secondary path. An anti -noise signal is then generated and added to the communication signal. The anti -noise signal is generated within approximately 6 or fewer micro - seconds. |
申请公布号 |
WO2011082284(A3) |
申请公布日期 |
2012.07.19 |
申请号 |
WO2010US62472 |
申请日期 |
2010.12.30 |
申请人 |
ROBERT BOSCH GMBH;THEVERAPPERUMA, LALIN;YOUSSEF, TALAL, ALY |
发明人 |
THEVERAPPERUMA, LALIN;YOUSSEF, TALAL, ALY |
分类号 |
G10K11/178 |
主分类号 |
G10K11/178 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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