| 摘要 |
PROBLEM TO BE SOLVED: To provide a method of inserting vector information for estimating voice data in a key resynchronization interval, a method of transmitting vector information, and a method of estimating voice data in a key resynchronization interval using vector information, for estimating the voice data that corresponds to a silent interval occurring in a key resynchronization process, when an encrypted digital voice is transmitted in a unidirectional wireless communications environment. SOLUTION: A transmitter side inserts accumulation information (that is, vector information) of a voice change direction of the transmitted previous frame in a key resynchronization frame, using a voice feature that draws a sine wave, when making the key resynchronization frame for the resynchronization, and transmits the key resynchronization frame with the vector information inserted therein. A receiver side estimates the voice data value in the key resynchronization interval using the accumulation information (that is, vector information) in the voice change direction and slopes of the received voice data, to minimize the difference between the original voice and the estimated voice. COPYRIGHT: (C)2008,JPO&INPIT
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