Radio set and frequency converting method therefor

Telecommunications – Receiver or analog modulated signal frequency converter – Frequency modifying or conversion

Reexamination Certificate

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Details

C455S317000, C455S323000, C455S086000

Reexamination Certificate

active

06850750

ABSTRACT:
To obtain a radio set in a direct conversion system so as not to have any undesired influence of a signal of a transmission system on a reception system. In a transmission system, a frequency Flo of a local signal used in a frequency converting process performed by a frequency converter is expressed as (M/N)·Frx by a frequency conversion circuit. Based on the frequency Flo and the transmission frequency Ftx, a intermediate frequency Ftxif of the transmission system is expressed as Ftxif=Flo−Ftx=(M/N)·Frx−Ftx which is an oscillation frequency of a second local oscillator. Therefore, an equation exists as Ftx+Ftxif={(M/N)·Frx−Ftxif}+Ftxif=(M/N)·Frx, although Ftx+Ftxif leak to the reception system. As a result, since it is different from a reception frequency band, no interference wave is generated for a received signal.

REFERENCES:
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patent: 5752169 (1998-05-01), Hareyama et al.
patent: 5819165 (1998-10-01), Hulkko et al.
patent: 6397044 (2002-05-01), Nash et al.
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patent: 8-223075 (1996-08-01), None
patent: 2000-13274 (2000-01-01), None
patent: 2000-13274 (2000-01-01), None
patent: WO 9926336 (1999-05-01), None

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