Telecommunications – Receiver or analog modulated signal frequency converter – Frequency or phase modulation
Reexamination Certificate
2003-04-30
2008-07-29
Anderson, Matthew (Department: 2618)
Telecommunications
Receiver or analog modulated signal frequency converter
Frequency or phase modulation
C455S146000, C455S196100, C455S147000
Reexamination Certificate
active
07406301
ABSTRACT:
A modulation-demodulation apparatus of a relatively simple arrangement is able to prevent a bad influence caused due to interference between two local oscillators and a portable wireless communication apparatus uses this modulation-demodulation apparatus. In a modulation-demodulation apparatus using a local oscillator (105) for use in direct conversion type of a receiving system and a local oscillator (104) for use with a transmitting system, a ratio (C/D) between a reception frequency and an oscillation frequency of the reception local oscillator (105) and a ratio (A/B) between a transmission frequency and an oscillation frequency of the transmission local oscillator are made different from each other.
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Kasahara Masaaki
Miya Shinji
Nakayama Kuniyuki
Asahi Kasei EMD Corporation
Frommer William S.
Frommer & Lawrence & Haug LLP
Presson Thomas F.
Rego Dominic E
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