GENERATING METHOD FOR SHIELDING SIGNALS USED FOR PROTECTING CHINESE SPEECH PRIVACY

摘要

A generating method for shielding signals used for protecting Chinese speech privacy comprises: (a) a probability table of sentences is obtained through statistics; (b) a probability table of paragraphs of statements is obtained through statistics; (c) a probability table of phrases is obtained through statistics; (d) a probability table of Chinese characters is obtained through statistics; (e) a probability table of syllables is obtained through statistics; (f) a text information is generated on the basis of the determined number of sentences in a paragraph, the number of paragraphs of statements in a sentence, the number of phrases in a paragraph of statements, the number of Chinese characters in a phrase and the syllables in Chinese characters; and (g) sound synthesis is carried out. The requirement of shielding sound in a meeting room and the features of Chinese speech are fully considered by the generating method for shielding signals, the conventional mode of shielding signals by adopting stationary noise, etc. is abandoned, and shielding signals which have no actual effect but are quite similar to normal speaking voice is generated on the basis of each statistical features of the words, the phrases and the sentences in Chinese language and by using a voice database of human utterance. Compared with conventional shielding noises, various side effects on hearing are greatly reduced and the effect of shielding sound is enhanced by the shielding signals.