Boots – shoes – and leggings
Patent
1980-07-08
1982-08-10
Smith, Jerry
Boots, shoes, and leggings
G06F 1531
Patent
active
043441491
ABSTRACT:
Decimation non-recursive digital linear phase FIR filter having a length N and a decimation factor q, comprising a first and a second digital delay line, both consisting of a cascade arrangement of a number of auxiliary delay lines each having a time delay qT. An individual distribution line is connected to the input of each of the delay lines as well as to the output of each of the auxiliary delay lines. Digital input signal components occurring with a period T are applied to the input of the first digital delay line and each auxiliary delay line contains q of these components. These two delay lines are coupled to one another by means of a sequence reversing device which comprises a store having a capacity of q signal components. This reversing device applies, in the next control interval, q input signal components, produced in a given control interval of length qT by the first delay line, in reversed order to the second delay line. Every two distribution lines which are arranged symmetrically relative to a symmetry line being connected to inputs of an adder device the output of which is connected to an input of an accumulation device via a multiplying device. A sequence of filter coefficients being applied to the multiplying device. The accumulation device now produces the sum of all products formed in a control interval.
REFERENCES:
patent: 3988607 (1976-10-01), Eggermont et al.
patent: 3997773 (1976-12-01), Van Essen et al.
patent: 4020332 (1977-04-01), Crochiere et al.
J. R. Bennett et al., "On the Characteristics of a Simple Architecture for Finite Impulse Response Digital Filtering", IEEE Transactions on Computers, vol. C-27, No. 12, Dec. 1978, pp. 1197-1202.
M. G. Bellanger et al., "Premultiplication Scheme for Digital FIR Filters with Application to Multirate Filtering", IEEE Transactions on Acoustics, Speech, and Signal Processing, vol. ASSP-26, No. 1, Feb. 1978, pp. 50-55.
Janssen Daniel J. G.
van de Meeberg Leendert
Briody Thomas A.
Goodman Edward W.
Smith Jerry
Streeter William J.
U.S. Philips Corporation
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