Tuner input filter with electronically adjustable center frequency for adapting to antenna characteristic

An input filter, center frequency technology, applied in the field of tuners, which can solve problems such as poor frequency response, poor adjacent channel performance, low gain, etc.

Inactive Publication Date: 2005-08-31
THOMSON LICENSING SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Tuner performance results will be lower gain, higher noise figure, poor frequency response, and poor adjacent channel performance
Unknown Impedance Causes Other Tuning Problems

Method used

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  • Tuner input filter with electronically adjustable center frequency for adapting to antenna characteristic
  • Tuner input filter with electronically adjustable center frequency for adapting to antenna characteristic
  • Tuner input filter with electronically adjustable center frequency for adapting to antenna characteristic

Examples

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Embodiment Construction

[0025] now refer to figure 1 , shows a block diagram of the RF signal receiver 20 related to the present invention. Preferably, but not necessarily, the RF signal receiver 20 is of a type that accepts user connection to an antenna of unknown impedance for RF signal reception, rather than using a fixed antenna of known impedance. RF signal receiver 20 may be, and thus represents, any type of RF signal receiver such as a television, radio, VCR, television signal receiver, cellular telephone, wireless local area network, etc., to which a user may attach Antenna and generally an external antenna for receiving RF signals. In the following description of exemplary embodiments of the present invention, a television receiver is described as a representative example of a system suitable for incorporating the principles of the present invention. However, the principles discussed here in the context of a television receiver are applicable to any form of RF signal receiver. More specif...

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PUM

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Abstract

A system, apparatus and / or method provides frequency response adjustment of an RF input filter (208) of an RF tuner (40) based on impedance of an antenna system (24) that is providing reception of RF signals to the RF tuner. The frequency response adjustment is preferably accomplished dynamically and / or with respect to each frequency tuned. Particularly, the system, method and / or apparatus provides compensation at the RF tuner level for mistuning effects produced on the RF tuner (40) by antenna system impedance (29) presented at the antenna input (30) that is other than a designed for impedance. Frequency response of an RF input filter (208, 216) for the RF tuner (40) is electronically adjustable with an independent or semi-independent control voltage signal based on one or more measured parameters of a tuning frequency. Frequency response adjustment may include adjustment of a center frequency of the RF input filter bandpass frequency range and / or altering the bandpass frequency range of the RF input filter. The subject invention expands the capability of an RF signal receiver, particularly one using at least one electronically adjustable RF filter at the input of an electronic alignment type tuner.

Description

[0001] This U.S. nonprovisional patent application claims the benefit and priority of three commonly assigned U.S. provisional patent applications filed April 26, 2002: U.S. Provisional Patent entitled Tuner Input Filter With Electronically Adjustable Center Frequency For Adapting to AntennaCharacteristic Application No. 60 / 376099; U.S. Provisional Patent Application No. 60 / 376127, entitled Tuner RF Input Filter With Integrated Signal Boost Provision; and U.S. Provisional Patent Application No. 60 / 376, entitled Tuner Input Filter With Electronically Adjustable Response For Adapting to Antenna Characteristic No. 376128. [0002] Cross References to Related Applications [0003] Cross-reference is made to related U.S. Patent Application No. 10 / xxx,xxx, entitled Tuner Input Filter With Electronically Adjustable Response For Adapting to Antenna Characteristic, filed on the same date as this application by Michael Anthony Pugel and Kumar Ramaswamy (Attorney Docket No. PU020191). te...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03J3/22H03J1/00H03J3/18H03J3/20H04B1/18H04N5/50H04N5/52
CPCH04N5/50H04N21/44209H03J2200/28H03J3/185H03J1/0066H04N21/4383H03J3/20H04N5/52H03J1/00
Inventor 迈克尔·A·帕格尔加里·D·格拉布斯爱德华·A·霍尔马克斯·W·马特斯波格
Owner THOMSON LICENSING SA
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