发明授权
- 专利标题: Method and system for performing an IIR filtering operation
- 专利标题(中): 用于执行IIR滤波操作的方法和系统
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申请号: US999618申请日: 1997-07-28
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公开(公告)号: US6085209A公开(公告)日: 2000-07-04
- 发明人: Shao Wei Pan
- 申请人: Shao Wei Pan
- 申请人地址: IL Schaumburg
- 专利权人: Motorola, Inc.
- 当前专利权人: Motorola, Inc.
- 当前专利权人地址: IL Schaumburg
- 主分类号: H03H17/04
- IPC分类号: H03H17/04 ; G06F17/10 ; G06F7/00
摘要:
A method and system for an IIR filter are provided. A sequence of input signals is converted to a first sequence of log signals, while a sequence of feedback signals is converted to a second sequence of log signals. IIR filtering coefficients are then added to each sequence of log signals to generate a plurality of term signals. The term signals are then converted to inverse-log signals which are summed to produce an output signal. The log/inverse-log conversions of signals are based on estimating a log/inverse-log function using a second-order polynomial.