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公开(公告)号：US5541997A
公开(公告)日：1996-07-30
申请号：US528367
申请日：1995-09-14
申请人： Scott J. Pappas , David L. Weiss
发明人： Scott J. Pappas , David L. Weiss
CPC分类号： H04K1/00
摘要： In a receiver (100), an encrypted communication (104) is decrypted using a decryptor (101) and a key (107) to produce a decrypted communication (105). A comparator (103) compares decrypted symbol patterns in the decrypted communication against a set of predetermined symbol patterns (108). When the decrypted symbol patterns are distributed non-uniformly relative to the set of predetermined symbol patterns, the receiver is identified as a target of the encrypted communication.
摘要翻译： 在接收机（100）中，使用解密器（101）和密钥（107）对加密通信（104）进行解密，以产生解密的通信（105）。 比较器（103）将解密的通信中的解密符号模式与一组预定符号模式（108）进行比较。 当解密的符号模式相对于一组预定符号模式不均匀地分布时，接收机被识别为加密通信的目标。
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公开(公告)号：US4893339A
公开(公告)日：1990-01-09
申请号：US903360
申请日：1986-09-30
申请人： Michael W. Bright , Eric F. Ziolko , Alan L. Wilson , Michelle M. Bray , Harry A. Hennen , David L. Weiss
发明人： Michael W. Bright , Eric F. Ziolko , Alan L. Wilson , Michelle M. Bray , Harry A. Hennen , David L. Weiss
CPC分类号： H04L9/12 , H04K1/02 , H04L9/0656 , H04L2209/34
摘要： Disclosed is a synchronous secure communication system wherein an information signal is encrypted in an encryption means. The encrypted signal is compressed to allow the insertion of a synchronization signal, and the combined signals are transmitted. At the receiver, the synchronization signal is extracted and used to synchronize the receiver to the incoming data stream thereby improving receiver sensitivity and range.
摘要翻译： 公开了一种同步安全通信系统，其中信息信号在加密装置中被加密。 加密信号被压缩以允许插入同步信号，并且传输组合的信号。 在接收机处，同步信号被提取并用于使接收机与输入数据流同步，从而提高接收机的灵敏度和范围。
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公开(公告)号：US4406010A
公开(公告)日：1983-09-20
申请号：US221189
申请日：1980-12-30
申请人： David L. Weiss , Eric F. Ziolko , Tim A. Williams
发明人： David L. Weiss , Eric F. Ziolko , Tim A. Williams
CPC分类号： H03M3/024
摘要： CVSD modulation is detected by applying a digital signal containing CVSD information to a digital filter that is in the CVSD loop that includes a syllabic filter and a rule circuit. The digital filter includes voltage-operated switches that switch one of two voltages to a resistor network and thereby combine multiplication and digital filtering. The output of the digital filter is the output of the circuit.
摘要翻译： 通过将包含CVSD信息的数字信号应用于包括音节滤波器和规则电路的CVSD循环中的数字滤波器来检测CVSD调制。 数字滤波器包括电压操作开关，其将两个电压中的一个切换到电阻器网络，从而组合乘法和数字滤波。 数字滤波器的输出是电路的输出。
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公开(公告)号：US4893308A
公开(公告)日：1990-01-09
申请号：US903315
申请日：1986-09-03
摘要： Disclosed is a method and apparatus for time companding a digital voice signal wherein, single bits are periodically removed from the digital voice signal, which is then compressed thereby forming a contiguous area of removed bits. A synchronization signal is inserted into this area and the combined signal is transmitted. At the receiver, the synchronization signal is extracted and is used to synchronize the receiver. The digital voice signal is then expanded and the removed bits are predicted and replaced.
摘要翻译： 公开了一种用于时间压缩数字语音信号的方法和装置，其中从数字语音信号周期性地移除单个比特，然后将其压缩，从而形成连续的去除比特的区域。 将同步信号插入该区域，并传送组合信号。 在接收机处，提取同步信号并用于同步接收机。 然后数字语音信号被扩展，并且去除的位被预测和替换。
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公开(公告)号：US5404403A
公开(公告)日：1995-04-04
申请号：US942864
申请日：1991-11-12
CPC分类号： H04L9/083 , H04L9/0891 , H04L2209/80
摘要： A key management system for encryption keys removes the effect of secure communications loss during a rekey period in a secure communications system. Use of key indexes to partition encryption keys into usable subgroups such that during a rekey period, continuous secure communications are maintained throughout the entire secure communications system.
摘要翻译： 用于加密密钥的密钥管理系统消除了在安全通信系统中的重新密钥期间的安全通信丢失的影响。 使用关键索引将加密密钥分成可用的子组，使得在重新密钥期间，在整个安全通信系统中保持连续的安全通信。
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公开(公告)号：US06819748B2
公开(公告)日：2004-11-16
申请号：US09966548
申请日：2001-09-27
IPC分类号： H04M164
CPC分类号： H04M1/64 , G06Q40/00 , G06Q40/025
摘要： A method and system for menuing on a voice response unit (VRU) or the like that avoids creating customer confusion on low volume calls that results in customer service representatives having to spend time clearing up that confusion without otherwise adversely affecting the system. For example, a menu for non-bankruptcy reaffirmation account and the like is included in the menus of a credit card VRU system. The menu and its sub-menus eliminate the options of balance transfers and credit limit increases that are inapplicable to those customers and result in an inordinate number of lengthy conversations.
摘要翻译： 一种用于在语音应答单元（VRU）等上进行菜单的方法和系统，其避免在低音量呼叫上产生客户混淆，导致客户服务代表必须花费时间清除混淆，而不会对系统造成不利影响。 例如，用于非破产重申帐户的菜单等被包括在信用卡VRU系统的菜单中。 菜单及其子菜单消除了对这些客户不适用的余额转移和信用额度增加的选项，并导致冗长的会话次数。
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公开(公告)号：US4167700A
公开(公告)日：1979-09-11
申请号：US792969
申请日：1977-05-02
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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