Digital interpolation filter and method of operating the digital interpolation filter

US7076512B2 · kind B2 · utility

Assignee

• Infineon Technologies AG · DE

Inventors

• Steffen Buch · Birkenfeld, DE
• Holger Gryska · Birkenfeld, DE

Key dates

• Filing date: Dec 16, 2002
• Grant date: Jul 11, 2006
• Expiry date: Sep 30, 2024

Classification

• Technology area (CPC H): Electricity
• CPC primary: H03H17/0657
• WIPO field: Basic communication processes
• WIPO sector: Electrical engineering

Abstract

A digital comb filter contains filter stages. Each filter stage has a latch disposed at a filter stage input, which latch, by outputting each input data value twice in each case doubles the sampling rate. Each filter stage further has a filter structure, a partial transfer function {overscore (H)} (z) of which is {overscore (H)}(z)α(1+z−1)k−1, where k is an order of the filter device and z−1 is the z transform of a delay by one sampling pulse. The implementation according to the invention does not require an error correction circuit.