Methods and apparatus for tuning pre-selection filters in...

Details Methods and apparatus for tuning pre-selection filters in... Methods and apparatus for tuning pre-selection filters in...

2005-12-20

2005-12-20

Hong, Harry S. (Department: 2642)

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

C455S192100, C455S255000, C455S266000, C455S313000

Reexamination Certificate

active

06978125

ABSTRACT:
A tuning arrangement in a radio receiver includes a front-end circuit having a tunable band-pass filter that is capable of tunably selecting channels within at least one frequency band of an RF signal. A noise source coupled to an input of the tunable band-pass filter introduces a wide-band noise signal into the front-end circuit. A signal detector coupled to an output of the front-end circuit measures at least one signal power associated with a filtered noise signal derived from the wide-band noise signal. A tuning controller, coupled to the tunable band-pass filter by a tuning control signal, adjusts the tuning control signal in response to the at least one measured signal power for tuning the tunable band-pass filter to a desired filter response.

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Klien W., et al., “TC-Tuner ATA”, Radio Fernsehen Elektronik, VEB Berlag Technik, Beline, DE, vol. 44, No. 2, Feb. 1, 1995, pp. 26-27.

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