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引言美国批准了五种制式进行调幅立体声广播,经过约三年的市场竞争,目前已从400多个电台采用的无互换性的四种制式,缩小为只有莫托罗拉和卡恩两种制式。可见,调幅
Introduction The United States has approved five types of AM stereo broadcasting. After about three years of market competition, the United States has now narrowed down from four non-interchangeable formats adopted by over 400 radio stations to only Motorola and Kahn . Visible, amplitude modulation