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    • 4. 发明授权
    • Modulation-demodulation apparatus and wireless communication apparatus
    • 调制解调装置和无线通信装置
    • US07406301B2
    • 2008-07-29
    • US10426234
    • 2003-04-30
    • Masaaki KasaharaShinji MiyaKuniyuki Nakayama
    • Masaaki KasaharaShinji MiyaKuniyuki Nakayama
    • H04B1/16
    • H04B1/40
    • 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.
    • 相对简单的配置的调制解调装置能够防止由于两个本地振荡器之间的干扰而引起的不良影响,并且便携式无线通信装置使用该调制解调装置。 在使用用于接收系统的直接转换型的本地振荡器(105)和与发送系统一起使用的本地振荡器(104)的调制解调装置中,在接收频率和接收频率之间的比率(C / D) 接收本地振荡器(105)的振荡频率和发送本地振荡器的发送频率和振荡频率之间的比率(A / B)彼此不同。