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    • 7. 发明申请
    • Modulating apparatus, mobile communication system, modulating method, and communication method
    • 调制装置,移动通信系统,调制方法和通信方法
    • US20070104279A1
    • 2007-05-10
    • US10578228
    • 2004-11-02
    • Masaru Taniguchi
    • Masaru Taniguchi
    • H04L27/00
    • H04L27/12H04L25/03834
    • An encoder encodes sound data and the like to generate a binary signal. A mapper converts the binary signal into a quaternary symbol and outputs the quaternary symbol. A base band filter includes a root raised cosine filter and a sinc filter. The base band filter blocks a predetermined frequency component of a symbol to shape the symbol into a waveform signal and outputs the waveform signal shaped. An FM modulator transmits a signal subjected to FM modulation according to a magnitude of an amplitude of a waveform signal to a receiving unit. When a symbol of ±3 is outputted from the mapper, a frequency shift of a signal transmitted from the FM modulator has a predetermined value in a range of ±0.822[kHz] to ±0.952[kHz]. This makes it possible to provide a modulating apparatus, a mobile communication system, a modulating method, and a communication method that use a modulating method that can conform to the FCC rule to be enforced in 2005 without using a linear power amplifier.
    • 编码器对声音数据等进行编码以产生二进制信号。 映射器将二进制信号转换为四进制符号并输出四进制符号。 基带滤波器包括根升余弦滤波器和正弦滤波器。 基带滤波器阻挡符号的预定频率分量以将符号形成波形信号,并输出成形的波形信号。 FM调制器根据波形信号的幅度的大小向接收单元发送经受FM调制的信号。 当从映射器输出±3的符号时,从FM调制器发送的信号的频移在±0.822 [kHz]至±0.952 [kHz]的范围内具有预定值。 这使得可以提供一种调制装置,移动通信系统,调制方法和通信方法,该调制方法和通信方法使用可以符合FCC规则的调制方法,以便在2005年不使用线性功率放大器。