Filtering discrete time signals using a notch filter
AssigneeIndian Institute of Science
InventorsSatya Sudhakar Yedlapalli, Kuchibhotla Venkata Subrahmanya Hari
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Abstract
Various techniques are generally described for digital signal processing (DSP) such as discrete time filters. In some examples, a Canonic Filter Module (CFM) can be used to configure the discrete time filter using an LSF-Model with a finite length sequence. A single CFM can be configured to provide any type of discrete time filter used in signal processing. Filters can be modeled as a set of interconnected notch filters, a lattice structure of a discrete time filter is generally described that is based on a LSF-Model.
Claims21
A method to determine a digital filter structure, the method comprising:
- obtaining, by a processor, a transfer function of a digital filter, wherein the digital filter includes one or more filter components including an annihilating component, a minimum phase component, a non-minimum phase component, and a symmetric component;
- creating a representation of the digital filter, wherein the representation represents each of the filter components as a set of interconnected notch filters, wherein each set of notch filters includes at least one of a first notch filter having a half-lattice structure, and a second notch filter having a full lattice structure;
- and
- storing the representation in a memory.
An article of manufacture including a non-transitory computer readable medium having instructions stored thereon that, in response to execution by a computing device, cause the computing device to perform operations comprising:
- obtaining a transfer function for a digital filter, wherein the digital filter includes one or more filter components including an annihilating component, a minimum phase component, a non-minimum phase component, and a symmetric component;
- and
- creating a representation of the digital filter, wherein the representation represents each of the filter components as a set of interconnected notch filters, wherein each set of notch filters includes at least one of a first notch filter having a half-lattice structure, and/or a second notch filter having a full lattice structure.
A device effective to filter digital signals, the device comprising:
- a processor, that includes one or more function modules, and the one or more function modules include at least one of an annihilating function module, a minimum phase function module, a non-minimum phase function module, and/or a symmetric function module,
- each of the function modules comprising a set of interconnected notch filters, wherein each set of notch filters includes at least one of a first notch filter having a half-lattice structure, and/or a second notch filter having a full lattice structure.
Dependencies are inferred from the claim text.