发明名称 |
Method and apparatus for encoding and decoding of audio transmission signals |
摘要 |
A system for encoding and decoding an audio transmission signal comprises: (a) an encoder with a frequency-varying means to vary the carrier frequency of the audio signal according to an encryption algorithm; (b) a transmitter; (c) a receiver; and (d) a decoder with a multi-plexing filter for separating segments of the audio signal with identical carrier frequencies, and a demodulator corresponding to each carrier signal frequency. The separated segments of the audio signal are switched to the corresponding demodulators according to a decryption algorithm.
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申请公布号 |
US5598471(A) |
申请公布日期 |
1997.01.28 |
申请号 |
US19940339464 |
申请日期 |
1994.11.14 |
申请人 |
SOUTH AFRICAN MICROELECTRONIC SYSTEMS LTD. |
发明人 |
RADEMEYER, PIETER |
分类号 |
H04K1/00;H04N7/16;(IPC1-7):H04L9/00 |
主分类号 |
H04K1/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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