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Method for the common transmission of digital and analogue modulated radio broadcasting and/or television broadcasting signals
Method for the common transmission of digital and analogue modulated radio broadcasting and/or television broadcasting signals
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机译:共同传输数字和模拟调制无线电广播和/或电视广播信号的方法
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摘要
A method is described that is used for common transmission of digital- and analog-modulated radio and/or television signals, in particular over a broad band cable system (30). The method includes transmitting at least one digital radio and/or television signal along with an analog television signal in one and the same channel, in which the frequency spectrum of the at least one digital radio and/or television signal is limited to a frequency range that is less than the width of the at least one channel. To lessen the influence of the at least one digital radio and/or television signal on the analog television signal, the at least one digital radio and/or television signal must fall below a predetermined signal level, and the peak level of the analog television signal must exceed a predetermined value, which is markedly higher than the predetermined signal level of the at least one digital radio and/or television signal. To prevent cross-modulation between analog- and digital-modulated radio and/or television signals, the amplitude of the frequency spectrum of the at least one digital radio and/or television signal must fall below a predetermined value, which is markedly lower than the amplitude of the video carrier of the analog television signal.
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