Title:
フィルタ装置、そのようなフィルタ装置を具える回路装置及びそのようなフィルタ装置を操作する方法
Document Type and Number:
Japanese Patent JP2008533941
Kind Code:
A
Abstract:
In order to provide a filter device (50, 60) as well as a method for processing input signals, in particular I[ntermediate]F[requency] input signals, for example sound signals, such as received television signals, wherein a bandpass function around the desired carriers is provided and the sound demodulation performance is not disturbed, at least one passive polyphase filter stage (50) being designed for image rejection and at least one active polyphase filter stage (60) being combined with the passive polyphase filter stage (50) and being designed for band pass as well as for contributing to the image rejection in order to relax the attenuation requirements of the passive polyphase filter stage (50) are proposed.
Inventors:
Axel Katner
Application Number:
JP2008502537A
Publication Date:
August 21, 2008
Filing Date:
March 20, 2006
Export Citation:
Assignee:
NXP B.V.
International Classes:
H03H9/64; H03H11/04; H04B1/26
Attorney, Agent or Firm:
Kenji Sugimura
Kosaku Sugimura
Kiyoshi Kuruma
Shiro Fujitani
Tatsuya Sawada
Eiji Fujiwara
Kosaku Sugimura
Kiyoshi Kuruma
Shiro Fujitani
Tatsuya Sawada
Eiji Fujiwara