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| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | Tsai, C. Fam, A.T. |
| Copyright Year | 1992 |
| Description | Author affiliation: Dept. of Electr. & Comput. Eng., State Univ. of New York, Buffalo, NY, USA (Tsai, C.; Fam, A.T.) |
| Abstract | The scaling factor in a direct form II infinite impulse response (IIR) digital filters depends on the system poles but not on its zeros. Adding pole-zero cancellation pairs can change the scaling factor and the associated roundoff noise without affecting the desired transfer function. Under l/sub 2/ scaling, the upper bound of the noise reduction of direct form II IIR filters augmented with K pole-zero cancellation pairs is found to be about 6 K dB. The above noise reduction is applied to parallel form, where each subfilter is augmented with one pole-zero cancellation pair and then realized in direct form II. An illustrative example shows that the roundoff noise of the resulting augmented realization is lower than that of optimal second-order state-space structure for lowpass elliptic filters with moderate passbands. This augmented realization requires about 3N multipliers for an Nth-order IIR filter. Comparison to the 2N multipliers of parallel form and the 4N multipliers of optimal second-order state-space structure shows that the additional computational complexity of this augmented realization is moderate, and is often well justified by the roundoff noise reduction.< |
| Starting Page | 417 |
| Ending Page | 420 |
| File Size | 260097 |
| Page Count | 4 |
| File Format | |
| ISBN | 0780305329 |
| ISSN | 15206149 |
| DOI | 10.1109/ICASSP.1992.226347 |
| Language | English |
| Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Publisher Date | 1992-03-23 |
| Access Restriction | Subscribed |
| Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Subject Keyword | IIR filters Noise reduction Noise cancellation Digital filters Upper bound Poles and zeros Passband Adders Added delay Narrowband |
| Content Type | Text |
| Resource Type | Article |
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