|국가/구분||United States(US) Patent 등록|
|미국특허분류(USC)||380/6 ; 380/19 ; 380/38|
|발명자 / 주소|
|출원인 / 주소|
|인용정보||피인용 횟수 : 9 인용 특허 : 16|
The present invention is directed to an inversion scrambler and unscrambler having pseudo-randomly controlled polarity-reversing switches to invert and re-invert, respectively, an audio signal so as to restrict the intelligent dissemination of the audio signal. To improve security of the scrambled signal, the audio signal is concealed prior to scrambling. Concealment includes clamping the original audio signal to a predetermined value and optionally offsetting this clamped signal prior to scrambling. The concealed signal is scrambled by inverting contigu...
A method of scrambling a received audio signal, said method comprising the steps of: obtaining a derived signal from said received audio signal, combining said derived signal with said received audio signal to produce a combined audio signal; and inverting at least one selected portion of said combined audio signal.