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1. 发明授权

US4167700A Digital voice protection system and method 失效
标题翻译：数字语音保护系统及方法
公开(公告)号：US4167700A
公开(公告)日：1979-09-11
申请号：US792969
申请日：1977-05-02
申请人： Richard H. Coe , Daniel J. McQuade , David L. Weiss
发明人： Richard H. Coe , Daniel J. McQuade , David L. Weiss
IPC分类号： H04B7/02 , H04B7/14 , H04K1/00
CPC分类号： H04K1/00
摘要： A digital voice privacy electronic communication system and method provides protection for an information signal. Either a clear voice signal or a scrambled digitized version of the voice signal is selected for transmission. At the receive end of the system a determination that a clear voice signal or a scrambled signal has been sent is made. This information is used to automatically switch the clear audio signal if present to an output circuit or to switch to the output circuit either a regenerated version of the scrambled signal or an unscrambled version of the information signal. The switching is done automatically so that a user does not have to manually select the proper receiver mode in response to reception of a signal, that is, whether the received signal was a clear voice signal or a scrambled signal. At the transmitter the information signal to be scrambled is analog-to-digital converted and the digital signal is then put into a scrambled form. The scrambled signal may be then processed through base stations, repeaters, satellite receivers, etc., while still in the digitally scrambled form, thereby providing a high degree of protection for such a signal. A receiver may regenerate, or reshape, the scrambled digital signals or the signal may be unscrambled in the receiver depending upon whether the receiver is part of, for example, a repeater system or is a terminal destination for the signal. The digital privacy system of this invention may also be utilized in signal voting systems, either analog or digital, while still maintaining, if necessary, the secure format of the scrambled information.
摘要翻译：数字语音隐私电子通信系统和方法为信息信号提供保护。选择语音信号的清晰语音信号或加扰数字化版本进行传输。在系统的接收端，确定发送了清晰的语音信号或加扰的信号。该信息用于将清除音频信号（如果存在）自动切换到输出电路，或者切换到加扰信号的再生版本或信息信号的未加扰版本的输出电路。切换自动完成，使得用户不必手动选择响应于接收信号的适当的接收机模式，即接收的信号是否是清晰的语音信号或加扰的信号。在发射机处，要加密的信息信号被模数转换，数字信号随后被加扰。然后可以通过基站，中继器，卫星接收机等处理加扰信号，同时仍然是数字加扰形式，从而为这种信号提供高度的保护。接收机可以重新生成或重新形成加扰的数字信号，或者信号可以在接收机中被解扰，这取决于接收机是否是例如中继器系统的一部分，或者是信号的终端目的地。本发明的数字隐私系统也可以在模拟或数字信号投票系统中使用，同时如果需要仍然保持加密信息的安全格式。

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