Scrambling of analogue electrical signals

专利名称：Scrambling of analogue electrical signals发明人：Parker, Michael Andrew申请号：EP88306401.6申请日：19880713公开号：EP0300678A2公开日：19890125

专利附图：

摘要：In a system in which an audio signal is scrambled by being divided into blockseach comprising a plurality of segments, and the segments are re-ordered within theblocks to provide the scrambled signal, the joins between the segments are required tobe located at a descrambler. To enable the joins to be located, a framing sequence is

added to the signal in synchronism with the segments and which consists of a low-levelsignal having a frequency spectrum which is substantially similar to the spectrum of theaudio signal. Preferably a pseudo-random binary sequence is used having typically 200 to500 bit periods per segment.

申请人：BRITISH BROADCASTING CORPORATION

地址：Broadcasting House London W1A 1AA GB

国籍：GB

代理机构：Harland, Linda Jane

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