Frequency conversion apparatus

Telecommunications – Receiver or analog modulated signal frequency converter – Local control of receiver operation

Reexamination Certificate

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Details

C455S209000, C455S316000

Reexamination Certificate

active

07024170

ABSTRACT:
A plurality of frequency conversion sections is provided, each of which comprises a first frequency mixer for converting the frequency of the input frequency signal by a signal from a first oscillator; a first filter for extracting an element signal from the output signal of the first frequency mixer; a second frequency mixer for converting the frequency of the output signal from the first filter by a signal from a second oscillator; and a second filter for extracting a element signal from the output signal of the second frequency mixer. The respective frequencies of the first and second oscillators are determined in accordance with a predetermined frequency setting rule specified by the relationship between the frequency conversion sections. The element signals sequentially arranged in a predetermined frequency interval can be rearranged in a desired frequency interval within a desired frequency bandwidth.

REFERENCES:
patent: 5390346 (1995-02-01), Marz
patent: 5608724 (1997-03-01), Green, Jr.
patent: 5847612 (1998-12-01), Birleson
patent: 6016170 (2000-01-01), Takayama et al.
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patent: 6118974 (2000-09-01), Holliday et al.
patent: 6152801 (2000-11-01), Tsai
patent: 6163684 (2000-12-01), Birleson
patent: 6177964 (2001-01-01), Birleson et al.
patent: 6657687 (2003-12-01), Takizawa
patent: 6714263 (2004-03-01), Cowley
patent: 6725463 (2004-04-01), Birleson
patent: 2002/0183033 (2002-12-01), Gu et al.
patent: DE 197 31 480 (1997-07-01), None
patent: 2000-299848 (2000-01-01), None
patent: WO 01/47261 (2000-12-01), None

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