The principle and application of adaptive record shielding technology

An unauthorized recording of a secret conversation may cause an information leakage accident. Base on the sound interference principle, the voice signal detection technology and the remix noise jamming technology, this paper developed a record shielding device which has obtained an independent intellectual property rights license. The recording blocker´s system structure, mixture of the interference voices, and the construction of its hardware and control algorithms are presented. Experimental results in a silent environment, a noisy environment and a voice volume changeable environment show that the recording blocker is able to jam digital voice recorders, tape recorders and mobile phones. Only disturbed voices can be recorded by the interfered recording devices and the content of a conversation cannot be restored even after some special treatments.