US 7,467,171 B2Granted

Digital filter device

AssigneeFujitsu Limited

InventorsYuji Ishii, Kenji Rikimaru, Kazuyuki Mori, Yuji Tochio

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Abstract

In a digital filter device which filters a plurality of signals by a single digital filter, an input data memory stores the input data strings generated by computing processors, and a digital filter reads the input data strings in a predetermined sequence to be filtered and generates output data strings. An output data memory stores the output data strings, and a data processor reads the output data strings in a predetermined sequence to be processed. Furthermore, a filter memory and coefficient memories respectively store data-under-calculation and a filter coefficient in a delay circuit included in the digital filter.

Claims4

Dependent claims

A digital filter device comprising:

one or more computing processors for generating input data strings;
an input data memory for storing the input data strings;
a single digital filter for reading the input data strings out of the input data memory to be filtered and for generating output data strings;
an output data memory for storing the output data strings generated by the digital filter;
a switch table for associating an address of the input data memory in which the input data strings are stored with an address of the output data memory in which the output data strings are stored;
and
a switching controller for providing variable timings of reading the input data strings out of the input data memory based on the switch table and of writing the input data strings as the output data strings in the output data memory through the digital filter.

4 more elements

Dependencies are inferred from the claim text.

Facts

Application: 10/647,073Filed 22 Aug 2003
Priority: JP 2002-24186522 Aug 2002
Published: US 2004/0107232 A13 Jun 2004
Granted: 16 Dec 2008
Term ends: Not estimatedThe source records don’t support an estimate.

Classification4 codes

H03H 17/02
Networks using digital techniques: frequency selective networks
H03H 17/0294
Frequency selective networks: variable filters; Programmable filters
H03H 17/04
Frequency selective networks: recursive filters
H03H
Impedance networks

Family

US 2004/0107232 A1Pre-grant publication · published 3 Jun 2004
US 7,467,171 B2This patent

From the US filing history. Foreign family members aren’t listed.

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