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Patent Searching and Data


Title:
Decimation method and decimation filter
Document Type and Number:
WIPO Patent Application WO1998025342
Kind Code:
A3
Abstract:
The invention relates to a decimation method and a decimation filter, which provide the transfer function of a CIC decimation filter. Decimation of the number of order N is performed by coefficient M, whereby FIR filtering is carried out in the main branch (100) of the decimation filter by M-tap FIR filters (20) N times in sequence, decimation is carried out by decimation means (21) by coefficient M and comb-filtering is carried out by means (22) N-1 times. The effect of sample cycles M preceding the sample cycle M to be processed is taken into account by using side branches (101, 102, 104) and additional branches (103, 105, 106, 107).

Inventors:
PIIRAINEN OLLI (FI)
Application Number:
PCT/FI1997/000753
Publication Date:
August 06, 1998
Filing Date:
December 03, 1997
Export Citation:
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Assignee:
NOKIA TELECOMMUNICATIONS OY (FI)
PIIRAINEN OLLI (FI)
International Classes:
H03H17/06; H03H17/00; (IPC1-7): H03H17/06; H03H17/00
Domestic Patent References:
WO1994023492A11994-10-13
WO1995010883A11995-04-20
Foreign References:
GB2180114A1987-03-18
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