Radio receiver and radio communication system

Details Radio receiver and radio communication system Radio receiver and radio communication system

2006-04-11

2006-04-11

Feild, Joseph (Department: 2681)

Telecommunications

Receiver or analog modulated signal frequency converter

Frequency modifying or conversion

C455S326000, C455S337000, C455S338000, C455S339000

Reexamination Certificate

active

07027794

ABSTRACT:
The cutoff frequency is set high in order to prevent suppression of low-frequency components so that high-quality reception control of a radio signal can be realized. A radio signal amplifier unit amplifies a received radio signal and results in an amplified signal. A frequency conversion unit mixes the amplified signal with a local oscillation signal to thereby convert the radio signal having a radio frequency signal into the radio signal having an intermediate frequency signal, resulting in an intermediate frequency signal. A frequency shift control unit shifts the intermediate frequency signal towards the upper part of the frequency band. A frequency inversion unit inverts a low-frequency side of the intermediate frequency signal towards the upper part of the frequency band and inverts a high-frequency side thereof towards a lower part thereof. An AC coupling unit is provided at an output side of the frequency control unit. A radio signal demodulating unit demodulates an output signal obtained via the AC coupling means.

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