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US 7,774,394 B2Granted
Exponentiated polyphase digital filter
AssigneeInfineon Technologies AG
InventorAndreas Menkhoff
Life of this patent
Estimating the term…
Abstract
The structure of a digital filter is provided through exponentiation of a polyphase digital filter. This exponentiation may be accomplished by determining an expression for the polyphase digital filter in terms of its polyphase components, and raising the expression for the polyphase digital filter to a power. The polyphase components are then arranged in a structure based on this exponentiated expression.
Claims34
A method of forming a polyphase digital filter comprising:
- arranging a first polyphase component filter in a filter structure between an input and an output of a polyphase digital filter;
- and
- arranging a second polyphase component filter in the filter structure of the polyphase digital filter, wherein the first and second polyphase component filters are interconnected in the filter structure of the polyphase digital filter based on exponentiated expression comprising an expression for the polyphase digital filter, in terms of first and second polyphase components, raised to a power, such that the polyphase digital filter is formed as an exponentiated polyphase digital filter.
A digital filter comprising:
- a plurality of A-filter blocks, each A-filter block applying a first polyphase component of a polyphase filter to an input signal;
- a plurality of B-filter blocks, each B-filter block applying a second polyphase component of the polyphase filter to the input signal;
- and
- a delay element that delays the input signal by one or more sample times, wherein the plurality of A-filter blocks, the plurality of B-filter blocks, and the delay element are interconnected in a structure that represents exponentiation of the polyphase filter by a power.
1 more element
A digital filter comprising:
- first filtering means for applying a first polyphase component of a polyphase filter to an input signal;
- second filtering means for applying a second polyphase component of the polyphase filter to the input signal;
- delay means for delaying the input signal by one or more sample times;
- and
- interconnection means for interconnecting the first filtering means, the second filtering means, and the delay means in a structure that represents exponentiation of the polyphase filter by a power.
2 more elements
A method of transforming a digital input signal, the method comprising:
- applying, in a polyphase digital filter, a plurality of instances of a first polyphase component of the polyphase digital filter to the digital input signal;
- applying, in the polyphase digital filter, a plurality of instances of a second polyphase component of the polyphase digital filter to the digital input signal;
- and
- applying, in the polyphase digital filter, a plurality of delays to the digital input signal;
- wherein the instances of the first polyphase component, the instances of the second polyphase component, and the delays are applied to the signal according to a structure representing exponentiation of the polyphase digital filter by a power of at least two.
2 more elements
A digital filter comprising:
- a plurality of instances of a first allpass digital filter;
- a plurality of instances of a second allpass digital filter;
- and
- a plurality of delay elements;
- wherein the instances of the first allpass digital filter, the instances of the second allpass digital filter, and the delay elements are arranged in a structure representing exponentiation by a power of at least two of a polyphase digital filter having the first allpass digital filter and the second allpass digital filter as polyphase components.
2 more elements
Dependencies are inferred from the claim text.