SUB-SCRAMBLING/DESCRAMBLING METHOD AND SUB-SCRAMBLING/DESCRAMBLING DEVICE

摘要

A sub-scrambling/descrambling method and device for enhancing the degree of scrambling of linear PCM data. Data is delimited every predetermined time, and the minimum value of a run is found and used as annex information. The run part is replaced with an arbitrary irreversible random data string. The data string is processed by a main scrambling device to generate transmission data. After the main descrambling of the transmission data, the descrambling device takes out the annex information and replaced the random data string with a predetermined "0" or "1" run according to the annex information. Thus, the degree of scrambling of linear PCM data is enhanced as much as or more than compressed video data is.