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    • 4. 发明授权
    • Method and system for reducing amplitude modulation (AM) noise in AM broadcast signals
    • 降低AM广播信号幅度调制(AM)噪声的方法和系统
    • US09270393B2
    • 2016-02-23
    • US13721396
    • 2012-12-20
    • Yao H. Kuo
    • Yao H. Kuo
    • H03D1/04H04H20/88H04B1/10H04B1/04G10K11/178
    • H04H20/88G10K11/178H04B1/0475H04B1/0483H04B1/1027
    • A computer-implemented method for reducing a noise signal added to an amplitude modulated (AM) broadcast signal while travelling from a broadcasting antenna to a receiving antenna is provided. The method includes capturing a signal representative of the AM broadcast signal corrupted by the noise signal via the receiving antenna, inverting the captured signal, and determining a carrying frequency of the AM broadcast signal and delaying the inverted waveform by a fraction of a cycle of the carrying frequency. The method further includes generating a difference signal by subtractively combining the captured signal and the delayed inverted signal, generating an estimate noise signal by reducing an amplitude of the generated difference signal using a noise-reduction control multiplier, and minimizing the corrupting noise signal component of the captured signal by subtractively combining the captured signal and the generated estimate noise signal.
    • 提供了一种用于在从广播天线传播到接收天线的同时减少添加到幅度调制(AM)广播信号中的噪声信号的计算机实现的方法。 该方法包括:经由接收天线捕获代表由噪声信号损坏的AM广播信号的信号,反转捕获的信号,以及确定AM广播信号的携带频率,并将反相波形延迟一小段时间 携带频率。 该方法还包括通过对捕获的信号和延迟的反相信号进行减法组合来产生差分信号,通过使用降噪控制乘法器减小产生的差分信号的幅度,并将损坏的噪声信号分量最小化来产生估计噪声信号 通过将所捕获的信号和产生的估计噪声信号进行减法组合来捕获信号。