公开(公告)号：US5844938A

公开(公告)日：1998-12-01

申请号：US690902

申请日：1996-08-01

申请人： Mark R. Hupp ,  Kenneth L. Snyder ,  Douglas E. Ehlers

发明人： Mark R. Hupp ,  Kenneth L. Snyder ,  Douglas E. Ehlers

IPC分类号： H03G3/34 ,  H04B1/10 ,  H04L27/22 ,  H04L27/18

CPC分类号： H03G3/34 ,  H04L27/22 ,  H04B1/1027

摘要： A method for providing improved carrier based data operated squelch (CDOS) includes routines for recovering the carrier signal and for analyzing the received signal. The received signal is sampled at each transition point of the carrier signal as well as the halfway points between the transition points. In addition, extra samples are taken between these samples. Using the samples, a carrier locked loop routine recovers the carrier signal. A CDOS routine analyzes the extra samples to determine the presence of data. If two successive samples are different, this means that a transition has occurred. The CDOS routine analyzes these transitions to determine whether the input signal is encoded with data. If the CDOS routine determines that the input signal is encoded with data, a CDOS counter is incremented. As the input continues to look like data, the value by which the CDOS counter is incremented is increased. When the CDOS counter reaches a certain threshold, the CDOS mutes the output circuit.

摘要翻译： 用于提供改进的基于载波的数据操作静噪（CDOS）的方法包括用于恢复载波信号并用于分析接收信号的例程。 在载波信号的每个转换点以及转换点之间的中间点对采样的信号进行采样。 此外，在这些样品之间采取额外的样品。 使用样本，载波锁定环程序恢复载波信号。 CDOS例程分析额外的样本以确定数据的存在。 如果两个连续的样本不同，这意味着发生了转换。 CDOS例程分析这些转换，以确定输入信号是否用数据编码。 如果CDOS程序确定输入信号用数据编码，则CDOS计数器递增。 当输入继续看起来像数据时，增加CDOS计数器的值。 当CDOS计数器达到一定阈值时，CDOS使输出电路静音。

公开(公告)号：US5771287A

公开(公告)日：1998-06-23

申请号：US690903

申请日：1996-08-01

申请人： James E. Gilley ,  Kenneth L. Snyder ,  Paul A. Schwartzkopf

发明人： James E. Gilley ,  Kenneth L. Snyder ,  Paul A. Schwartzkopf

IPC分类号： H04K1/00 ,  H04L9/32 ,  H04L9/00

CPC分类号： G06F21/31 ,  G06F21/73 ,  H04K1/00 ,  H04L9/3226 ,  G06F2221/2129 ,  G06F2221/2141 ,  H04L2209/80

摘要： An apparatus and method for controlling the feature set of a programmable device by assigning each programmable device a unique serial number, correlating a secret key with each serial number, and keeping that information in a secure location, such as at the manufacturer. Each optional feature set for the programmable devices is assigned a unique code, and software associated with the programmable device operates according to the feature set identified in the feature set code, if an authentication procedure is passed. The authentication procedure utilizes a secure cryptographic algorithm to calculate an authentication code based on the secret key and the authorized feature set for a programmable device. The authentication code is stored in the programmable device. Periodically, the programmable device automatically self checks itself by recalculating the authentication code. If it matches with the authorized authentication code, the authentication procedure is passed. If it does not match, the authentication procedure is not passed as it tends to indicate that there has been an attempt to tamper with the feature set code or to use an authorization code that is from another programmable device. If the authentication procedure is not passed, the programmable device may be disabled or some other limitation may be imposed on the device.

摘要翻译： 通过向每个可编程设备分配唯一的序列号，将秘密密钥与每个序列号相关联并将该信息保存在诸如制造商的安全位置中，来控制可编程设备的特征集的装置和方法。 每个可编程设备的可选功能集被分配唯一的代码，并且与可编程设备相关联的软件如果通过认证过程，则根据特征集代码中识别的特征集进行操作。 认证过程利用安全密码算法根据秘密密钥和可编程设备的授权特征集来计算认证码。 验证码存储在可编程设备中。 定期地，可编程设备通过重新计算认证码来自动自我检查。 如果它与授权认证码匹配，则认证过程被传递。 如果它不匹配，则认证过程不会被传递，因为它倾向于指示已经尝试篡改特征集代码或使用来自另一个可编程设备的授权码。 如果不通过认证过程，则可编程设备可能被禁用或者可能对该设备施加一些其他限制。

公开(公告)号：US5278907A

公开(公告)日：1994-01-11

申请号：US24408

申请日：1993-03-01

申请人： Kenneth L. Snyder ,  Ronald B. Kabler

发明人： Kenneth L. Snyder ,  Ronald B. Kabler

IPC分类号： H04K1/04 ,  H04L9/00

CPC分类号： H04K1/04

摘要： A device and method for scrambling and de-scrambling audio and voice communications including radio, cellular telephone, and conventional telephone communication. The audio communication can be scrambled using, for example, time varying pseudo-random spectral modification. Continuous data containing synchronization information is transmitted with the scrambled signal to eliminate time lags that occur with synchronization bursts and without detrimentally affecting audio quality.

摘要翻译： 一种用于对包括无线电，蜂窝电话和常规电话通信在内的音频和语音通信进行加扰和解扰的装置和方法。 音频通信可以使用例如时变伪随机频谱修改来加扰。 使用加扰信号发送包含同步信息的连续数据，以消除在同步脉冲串中发生的时间滞后，并且不会对音频质量造成不利影响。