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    • 3. 发明申请
    • DARC SIGNAL DEMODULATION CIRCUIT ARRANGEMENT AND METHOD FOR OPERATING SAME
    • DARC信号解调电路布置及其操作方法
    • US20160373280A1
    • 2016-12-22
    • US15123057
    • 2015-02-02
    • ROBERT BOSCH GMBH
    • Detlev NYENHUIS
    • H04L27/227H04B1/16
    • H04L27/227H03D3/007H04B1/16H04B1/1646H04B1/30H04H2201/13H04L27/2014
    • A DARC signal demodulation circuit assemblage for recovering a DARC signal (DARC data) from an FM multiplex transmission signal includes: a pilot tone regulation circuit to obtain first and second mutually orthogonal oscillation synchronous with a stereo pilot tone encompassed by the FM multiplex transmission signal; a frequency quadruplication section for obtaining third and fourth mutually orthogonal oscillation having a frequency quadrupled as to the stereo pilot tone; a first multiplication section for obtaining a first multiplication signal from the FM multiplex transmission signal and from the third oscillation; a second multiplication section for obtaining a second multiplication signal from the FM multiplex transmission signal and from the fourth oscillation; first/second low-pass filters for obtaining first/second DARC signal components by low-pass filtration of the first and second multiplication signals; and an FM demodulation section for obtaining the DARC signal from a frequency demodulation of the first/second DARC signal components.
    • 用于从FM多路传输信号恢复DARC信号(DARC数据)的DARC信号解调电路组件包括:导频音调节电路,用于获得与由FM多路传输信号包围的立体声导频音同步的第一和第二相互正交的振荡; 频率四重部分,用于获得频率为立体声导频音的四倍的第三和第四相互正交的振荡; 第一乘法部分,用于从FM多路传输信号和第三振荡获得第一相乘信号; 第二乘法部分,用于从FM多路传输信号和第四振荡获得第二乘法信号; 第一/第二低通滤波器,用于通过第一和第二相乘信号的低通滤波获得第一/第二DARC信号分量; 以及FM解调部分,用于从第一/第二DARC信号分量的频率解调获得DARC信号。