Boots – shoes – and leggings
Patent
1978-06-19
1980-03-25
Malzahn, David H.
Boots, shoes, and leggings
364745, G06F 738
Patent
active
041953509
ABSTRACT:
Method and apparatus for eliminating deadband effects in digital recursive filters caused by rounding of the quantization of products within the filter, wherein the product is represented by a digital word, consists of truncating the absolute value of the product-representing word to the next lower digit by dropping a number of least significant digits determined by the value of the multiplier and if any of the dropped digits is a "one", adding a least significant "one" to the truncated number while retaining the sign of the pre-truncated word, and repeating the process at the cycling frequency of the filter, until a steady state is reached at which the difference between the input and output of the filter becomes zero. The concept is described as embodied in a digital system utilizing a recursive filter for reducing noise in a color television signal.
REFERENCES:
patent: 3749895 (1973-07-01), Kao
patent: 3906199 (1975-09-01), Kieburtz et al.
patent: 4034196 (1977-07-01), Butterweck et al.
patent: 4064530 (1977-12-01), Kaiser et al.
patent: 4107739 (1978-09-01), Rossi et al.
Bogner et al., Introduction to Digital Filtering, John Wiley & Sons, 1975, pp. 173-174. _
Gold et al., Digital Processing of Signals, McGraw-Hill Book Company, 1969 pp. 112-116. _
Kieburtz, "Rounding & Truncation Limit Cycles in a Recursive Digital Filter," IEEE Trans. on Acoustics, Speech & S.P., Feb. 1974 p. 73. _
Claasen, "Effects of Quantization & Overflow in Recursive Digital Filters, "IEEE Trans. on Acoustics, Speech & Signal Processing, Dec. 1976 pp. 517-527. _
CBS Inc.
Malzahn David H.
Olson Spencer E.
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