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1. 发明授权

US5278908A Interdiction method and apparatus with programmable jamming effectiveness 失效
标题翻译：具有可编程干扰效果的截断方法和装置
公开(公告)号：US5278908A
公开(公告)日：1994-01-11
申请号：US896292
申请日：1992-06-10
申请人： Himanshu R. Parikh , Michael P. Harney , Paul Borsetti, Jr. , Vibha Rustagi , Mark E. Schutte
发明人： Himanshu R. Parikh , Michael P. Harney , Paul Borsetti, Jr. , Vibha Rustagi , Mark E. Schutte
IPC分类号： H04N7/16 , H04N7/167
CPC分类号： H04K3/825 , H04K3/41 , H04K3/42 , H04N7/166 , H04K2203/14
摘要： An off-premises method and apparatus for the interdiction of unauthorized channels of a broadband cable television signal includes common circuitry for adjusting the amplitude and equalization levels of the broadband CATV signals and one or more subscriber modules for generating jamming signals of different frequencies which are used to interdict one or more unauthorized channels. Each subscriber module is associated with a subscriber and is programmable and addressable to adjust the jamming parameters of that subscriber independently of other subscribers. Each subscriber module circuit comprises a plurality of latches, each of which is associated with one of a plurality of digital to analog converters. Each of the digital to analog converters drives one or more frequency agile oscillators with its analog output to generate the jamming signals. The subscriber module is based on a sequential state machine which loads frequency control words corresponding to the jammed channels from a frequency control memory into each latch on a cyclic basis. According to one illustrated implementation, the system is adapted to perform with various jamming factors, including pulsed or continuous mode jamming, variable dwell time, and variable hopping rates depending upon the channel line-up of a particular CATV system. Generally, heavy jamming factors are combined with fast hopping rates while light jamming factors are combined with slow hopping rates. Pulsed mode jamming is combined with slow hopping rates and light jamming factors. Using a combination of jamming parameters based on a channel line-up for a particular subscriber improves overall jamming effectiveness.
摘要翻译：用于拦截宽带有线电视信号的未授权信道的非处所方法和装置包括用于调整宽带CATV信号的幅度和均衡水平的公共电路以及用于产生使用的不同频率的干扰信号的一个或多个用户模块阻止一个或多个未授权渠道。每个用户模块与订户相关联，并且是可编程的并且可寻址，以独立于其他用户来调整该用户的干扰参数。每个用户模块电路包括多个锁存器，每个锁存器与多个数模转换器中的一个相关联。每个数模转换器通过其模拟输出驱动一个或多个频率敏捷振荡器，以产生干扰信号。订户模块基于顺序状态机，其将频繁控制存储器中对应于干扰信道的频率控制字逐个加载到每个锁存器中。根据所示的实施方式，该系统适于根据特定CATV系统的信道阵列，以各种干扰因素执行，包括脉冲或连续模式干扰，可变驻留时间和可变跳频率。通常，重型干扰因素与快速跳频组合，而光干扰因素与缓慢的跳频率相结合。脉冲模式干扰与慢跳频率和光干扰因素相结合。使用基于特定用户的频道阵容的干扰参数的组合可以提高整体干扰效果。

2. 发明授权

US5265160A Interdiction method and apparatus with pulsed mode jamming 失效
标题翻译：具有脉冲模式干扰的截断方法和装置
公开(公告)号：US5265160A
公开(公告)日：1993-11-23
申请号：US896708
申请日：1992-06-10
申请人： Michael P. Harney , Vibha Rustagi , Himanshu R. Parikh , Mark E. Schutte
发明人： Michael P. Harney , Vibha Rustagi , Himanshu R. Parikh , Mark E. Schutte
IPC分类号： H04N7/16 , H04N7/167
CPC分类号： H04K3/825 , H04K3/42 , H04N7/166 , H04K2203/14
摘要： An off-premises method and apparatus for the interdiction of unauthorized channels of a broadband cable television signal includes common circuitry for adjusting the amplitude and equalization levels of the broadband CATV signals and one or more subscriber modules for generating jamming signals of different frequencies which are used to interdict one or more unauthorized channels. Each subscriber module is associated with a subscriber and is programmable and addressable to adjust the jamming parameters of that subscriber independently of other subscribers. Each subscriber module circuit comprises a plurality of latches, each of which is associated with one of a plurality of digital to analog converters. Each of the digital to analog converters drives one or more frequency agile oscillators with its analog output to generate the jamming signals. The subscriber module is based on a sequential state machine which loads frequency control words corresponding to the jammed channels from a frequency control memory into each latch on a cyclic basis. According to one illustrated implementation, the addresses of the frequency control memory are generated in subgroups of the possible time slots for a duration called a repeat cycle. Each additional subgroup is then sequentially addressed for the repeat cycle before the scheme is initiated again. This technique is termed "pulsed mode" where subgroups of 8 out of 16, termed "half mode", and 4 out of t16, termed "quarter mode", are illustrated. This pulsed mode of operation results in channels which are jammed during the repeat cycle and then are in the clear for other times. This type of operation provides a great deal of flexibility in distributing jamming energy to a large number of channels which can be lightly jammed. The entertainment value of the channel is thus effectively destroyed without the need of oscuring the video 100% of the time.
摘要翻译：用于拦截宽带有线电视信号的未授权信道的非处所方法和装置包括用于调整宽带CATV信号的幅度和均衡水平的公共电路以及用于产生使用的不同频率的干扰信号的一个或多个用户模块阻止一个或多个未授权渠道。每个用户模块与订户相关联，并且是可编程的并且可寻址，以独立于其他用户来调整该用户的干扰参数。每个用户模块电路包括多个锁存器，每个锁存器与多个数模转换器中的一个相关联。每个数模转换器通过其模拟输出驱动一个或多个频率敏捷振荡器，以产生干扰信号。订户模块基于顺序状态机，其将频繁控制存储器中对应于干扰信道的频率控制字逐个加载到每个锁存器中。根据所示的实施方案，频率控制存储器的地址在称为重复周期的持续时间的可能时隙的子组中生成。然后，在再次启动方案之前，每个附加子组在重复循环中顺序寻址。该技术被称为“脉冲模式”，其中示出了称为“半模式”的16个中的8个，称为“四分之一模式”的t16中的4个。这种脉冲操作模式导致在重复循环期间卡住的通道，然后在其他时间处于清除状态。这种类型的操作在将干扰能量分配到可能被轻微卡住的大量通道上提供了很大的灵活性。因此，频道的娱乐价值被有效地破坏，而不需要在100％的时间内观看视频。

3. 发明授权

US5505901A CATV pay per view interdiction system method and apparatus 失效
标题翻译：有线电视付费监视系统的方法和装置
公开(公告)号：US5505901A
公开(公告)日：1996-04-09
申请号：US218037
申请日：1994-03-25
申请人： Michael P. Harney , Himanshu R. Parikh , Lamar E. West, Jr. , James O. Farmer , Mark E. Schutte
发明人： Michael P. Harney , Himanshu R. Parikh , Lamar E. West, Jr. , James O. Farmer , Mark E. Schutte
IPC分类号： H04H20/78 , H04H60/97 , H04N7/16 , H04N7/10
CPC分类号： H04H20/78 , H04H60/97 , H04N21/25891 , H04N21/44222
摘要： Off-premises cable television pay per view apparatus is coupled between first and second diplexers of off-premises subscriber service providing equipment. The diplexers separate the transmission path between a headend and a subscriber into downstream or forward and upstream or reverse transmission paths. A radio frequency transmitter is coupled between a controller and the upstream diplexer which may actuate a selected one of a plurality of data channels in the notoriously noisy subsplit 5-30 megahertz transmission spectrum for reporting billable events. On-premises equipment is minimized to comprise only a unidirectional data transmitter. The data transmission is sent repetitively over a predetermined period of time before the data transmitter, comprising a microprocessor, turns itself off to conserve power. Thus, data transmitted from the subscriber in a first format is received at off-premises equipment, service is authorized there if appropriate, and then data is transmitted over a data channel selected so as to avoid noisy portions of the spectrum in a second format to a headend.
摘要翻译：室外有线电视付费视频设备耦合在室外用户服务提供设备的第一和第二双工器之间。双工器将前端和用户之间的传输路径分离成下行或前向以及上行或反向传输路径。无线电频率发射机耦合在控制器和上行双工器之间，该双工器可以在臭名昭着的噪声分段5-30兆赫兹传输频谱中激活多个数据信道中选定的一个，用于报告可计费事件。本地设备被最小化以仅包括单向数据发射机。在包括微处理器的数据发射机自身断开以节省功率之前，数据传输在预定的时间段内重复发送。因此，在外部设备处接收从用户发送的以第一格式发送的数据，如果适当，服务被授权在那里，然后通过所选择的数据信道发送数据，以避免第二格式的频谱的噪声部分一个头端

4. 发明授权

US5243647A Method and apparatus for broadband signal distribution 失效
标题翻译：宽带信号分配方法和装置
公开(公告)号：US5243647A
公开(公告)日：1993-09-07
申请号：US896447
申请日：1992-06-10
申请人： Himanshu Parikh , Paul Borsetti, Jr. , Vibha Rustagi , Mark E. Schutte
发明人： Himanshu Parikh , Paul Borsetti, Jr. , Vibha Rustagi , Mark E. Schutte
IPC分类号： H04N7/173
CPC分类号： H04N7/17354
摘要： Apparatus for broadband signal distribution is equipped with a detector for detecting when the apparatus is open and is further adapted to receive an entry code generator. If the entry code generator is not installed or, if installed, fails to generate an entry code which matches an authorized entry code stored in the apparatus, the apparatus enters a particular mode of operation whereby service provided by the apparatus is interfered with. The entry code generator comprises a circuit board for coupling with an electrical connector of the apparatus having at least one ear which precludes closure of a cover to the apparatus. A method of screening access to the apparatus from others than authorized service personnel includes waiting a predetermined period of time for coupling the access code generator before service is interfered with. Furthermore, the stored access code may be changed or the predetermined time varied by addressable command from a headend of a broadband signal distribution system.
摘要翻译：用于宽带信号分配的设备配备有检测器，用于检测设备何时打开，并且还适于接收入口代码生成器。如果没有安装入口代码生成器，或者如果安装了，则不能生成与存储在设备中的授权入口代码相匹配的入口代码，则该设备进入由设备提供的服务受到干扰的特定操作模式。入口代码生成器包括用于与具有至少一个耳朵的装置的电连接器联接的电路板，其排除了将盖子关闭到设备。从授权服务人员那里筛选其他设备的访问方法包括在服务被干扰之前等待预定的时间段来耦合接入码发生器。此外，可以从宽带信号分配系统的前端改变存储的访问代码或预定时间由可寻址命令变化。

5. 发明授权

US07099308B2 Router for use with a link that has a set of concurrent channels 有权
标题翻译：路由器用于具有一组并发通道的链路
公开(公告)号：US07099308B2
公开(公告)日：2006-08-29
申请号：US10457124
申请日：2003-06-09
申请人： Todd A. Merrill , Mark E. Schutte , Scott E. Hrastar , Roy A. Bowcutt
发明人： Todd A. Merrill , Mark E. Schutte , Scott E. Hrastar , Roy A. Bowcutt
IPC分类号： H04L12/56
CPC分类号： H04L29/12216 , H04H20/79 , H04H60/84 , H04L12/2801 , H04L12/2856 , H04L12/2863 , H04L12/2872 , H04L12/2874 , H04L12/5692 , H04L29/06 , H04L29/12207 , H04L29/12283 , H04L29/12801 , H04L29/12839 , H04L41/0213 , H04L41/0663 , H04L41/0677 , H04L61/20 , H04L61/2015 , H04L61/2061 , H04L61/6004 , H04L61/6022 , H04L63/08 , H04L69/40 , H04N7/17309 , H04N21/25816 , H04N21/42676 , H04N21/6118 , H04N21/6168
摘要： An asymmetrical network is disclosed for coupling customer-premises Internet hosts such as personal computers to the Internet. The head end of a CATV system has a high-bandwidth connection to the Internet. The CATV system supports a plurality of concurrent channels to which an RF modem is capable of tuning. The RE modem is capable of receiving information from the head end that specifies the channel to which the RF modem should tune. Once tuned to the specified channel, the RF modem is capable of utilizing the CATV system for carrying high-speed data traffic. The high-speed data traffic can support Internet access using the Internet Protocol (IP).
摘要翻译：公开了一种不对称网络，用于将诸如个人计算机的客户端互联网主机与因特网相连。 CATV系统的前端具有与因特网的高带宽连接。 CATV系统支持RF调制解调器能够进行调谐的多个并发信道。 RE调制解调器能够从头端接收指定RF调制解调器应调谐的信道的信息。一旦调谐到指定的通道，RF调制解调器就能利用CATV系统来承载高速数据流量。高速数据流量可以使用互联网协议（IP）支持Internet访问。

6. 发明授权

US5463689A Interdiction method and apparatus with random mode jamming 失效
标题翻译：具有随机模式干扰的截断方法和装置
公开(公告)号：US5463689A
公开(公告)日：1995-10-31
申请号：US115357
申请日：1993-09-02
申请人： Mark E. Schutte , William B. Thatcher , Lamar E. West
发明人： Mark E. Schutte , William B. Thatcher , Lamar E. West
IPC分类号： H04N7/16 , H04K1/00
CPC分类号： H04K3/825 , H04K3/41 , H04K3/42 , H04N7/166 , H04K2203/14
摘要： An off-premises method and apparatus for the interdiction of unauthorized channels of a broadband cable television signal includes common circuitry for adjusting the amplitude and equalization levels of the broadband CATV signals and one or more subscriber modules for generating jamming signals of different frequencies which are used to interdict one or more unauthorized channels. Each subscriber module is associated with a subscriber and is programmable and addressable to adjust the jamming parameters of that subscriber independently of other subscribers. Each subscriber module circuit comprises a plurality of latches, each of which is associated with one of a plurality of digital to analog converters. Each of the digital to analog converters drives one or more frequency agile oscillators with its analog output to generate the jamming signals. The subscriber module is based on a sequential state machine which loads frequency control words corresponding to the jammed channels from a frequency control memory into each latch on a cyclic basis. The state machine is adapted to modify the sequence in which the frequency control words are read out of memory to vary the jamming pattern of the subscriber. According to one illustrated implementation, the addresses of the memory are read out in a pseudo random sequence to produce varying jamming patterns but without changing a selected jamming factor for a selected group of channels. The pseudo-random pattern is generated by logically combining a predetermined address sequence with a random number seed from a seed generator. The random number seed can be varied either programmably or addressably to generate other pseudo-random jamming patterns. In another implementation the seed generator will evenly distribute the jamming energy of unused time slots to all the other active time slots.
摘要翻译：用于拦截宽带有线电视信号的未授权信道的非处所方法和装置包括用于调整宽带CATV信号的幅度和均衡水平的公共电路以及用于产生使用的不同频率的干扰信号的一个或多个用户模块阻止一个或多个未授权渠道。每个用户模块与订户相关联，并且是可编程的并且可寻址，以独立于其他用户来调整该用户的干扰参数。每个用户模块电路包括多个锁存器，每个锁存器与多个数模转换器中的一个相关联。每个数模转换器通过其模拟输出驱动一个或多个频率敏捷振荡器，以产生干扰信号。订户模块基于顺序状态机，其将频繁控制存储器中对应于干扰信道的频率控制字逐个加载到每个锁存器中。状态机适于修改频率控制字从存储器读出的顺序，以改变用户的干扰模式。根据一个所示的实施方案，以伪随机序列读出存储器的地址以产生变化的干扰模式，但是不改变所选择的信道组的所选择的干扰因子。通过将来自种子发生器的预定地址序列与随机数种子进行逻辑组合来产生伪随机模式。随机数种子可以可编程地或可寻址地改变以产生其他伪随机干扰模式。在另一个实施方式中，种子发生器将将未使用的时隙的干扰能量均匀地分配给所有其他活动时隙。

7. 发明授权

US06178455B1 Router which dynamically requests a set of logical network addresses and assigns addresses in the set to hosts connected to the router 失效
标题翻译：路由器，其动态地请求一组逻辑网络地址，并将集合中的地址分配给连接到路由器的主机
公开(公告)号：US06178455B1
公开(公告)日：2001-01-23
申请号：US08843056
申请日：1997-04-11
申请人： Mark E. Schutte , Scott E. Hrastar
发明人： Mark E. Schutte , Scott E. Hrastar
IPC分类号： G06F1573
CPC分类号： H04L29/12216 , H04H20/79 , H04H60/84 , H04L12/2801 , H04L12/2856 , H04L12/2863 , H04L12/2872 , H04L12/2874 , H04L12/5692 , H04L29/06 , H04L29/12207 , H04L29/12283 , H04L29/12801 , H04L29/12839 , H04L41/0213 , H04L41/0663 , H04L41/0677 , H04L61/20 , H04L61/2015 , H04L61/2061 , H04L61/6004 , H04L61/6022 , H04L63/08 , H04L69/40 , H04N7/17309 , H04N21/25816 , H04N21/42676 , H04N21/6118 , H04N21/6168
摘要： The problem of wasting IP addresses by statically assigning them to hosts is solved as follows: when a cable router or RF modem becomes active, it sends a message requesting a set of IP addresses from the head end, which dynamically assigns the set of IP addresses and sends a message comprising the set of IP addresses to the cable router or RF modem. The cable router or RF modem then responds to requests by the hosts for IP addresses by assigning them IP addresses from the set. Furthermore, the set of IP addresses is released when the session terminates with the cable router or RF modem.
摘要翻译：通过静态分配给主机来浪费IP地址的问题解决如下：当有线路由器或RF调制解调器变为活动状态时，它从头端发送一个请求一组IP地址的消息，动态分配一组IP地址并将包含该IP地址集的消息发送到有线路由器或RF调制解调器。电缆路由器或RF调制解调器然后通过从组中分配IP地址来响应主机对IP地址的请求。此外，当会话使用电缆路由器或RF调制解调器终止时，IP地址集被释放。

8. 发明授权

US5317635A Interdiction method and apparatus with mode control for variable frequency elements 失效
标题翻译：具有可变频率元件模式控制的截断方法和装置
公开(公告)号：US5317635A
公开(公告)日：1994-05-31
申请号：US896261
申请日：1992-06-10
申请人： Ronald C. Stirling , Mark E. Schutte , Neil C. Robertson
发明人： Ronald C. Stirling , Mark E. Schutte , Neil C. Robertson
IPC分类号： H04N7/16 , H04N7/167
CPC分类号： H04K3/825 , H04K3/41 , H04K3/42 , H04N7/166 , H04K2203/14
摘要： An off-premises method and apparatus for the interdiction of unauthorized channels of a broadband cable television signal includes common circuitry for adjusting the amplitude and equalization levels of the broadband CATV signals and one or more subscriber modules for generating jamming signals of different frequencies which are used to interdict one or more unauthorized channels. Each subscriber module is associated with a subscriber and is programmable and addressable to adjust the jamming parameters of that subscriber independently of other subscribers. Each subscriber module circuit comprises a plurality of latches, each of which is associated with one of a plurality of digital to analog converters. Each of the digital to analog converters drives one or more frequency agile oscillators with its analog output to generate the jamming signals. The subscriber module is based on a sequential state machine which loads frequency control words corresponding to the jammed channels from a frequency control memory into each latch on a cyclic basis. The state machine is adapted to vary the sequence in which frequency control words are read out of the memory to modify the jamming pattern of the subscriber. Corresponding to each frequency control word in the memory is stored one or more mode control bits which are read out contemporaneously with the frequency control words. The mode control bits are used to allow a single digital to analog converter to control one or more voltage control oscillators with different frequency ranges, or to allow control of a single voltage control oscillator with multiple frequency ranges.
摘要翻译：用于拦截宽带有线电视信号的未授权信道的非处所方法和装置包括用于调整宽带CATV信号的幅度和均衡水平的公共电路以及用于产生使用的不同频率的干扰信号的一个或多个用户模块阻止一个或多个未授权渠道。每个用户模块与订户相关联，并且是可编程的并且可寻址，以独立于其他用户来调整该用户的干扰参数。每个用户模块电路包括多个锁存器，每个锁存器与多个数模转换器中的一个相关联。每个数模转换器通过其模拟输出驱动一个或多个频率敏捷振荡器，以产生干扰信号。订户模块基于顺序状态机，其将频繁控制存储器中对应于干扰信道的频率控制字逐个加载到每个锁存器中。状态机适于改变从存储器读出频率控制字的顺序，以修改用户的干扰模式。与存储器中的每个频率控制字相对应地存储与频率控制字同时读出的一个或多个模式控制位。模式控制位用于允许单个数模转换器控制具有不同频率范围的一个或多个电压控制振荡器，或允许控制具有多个频率范围的单个压控振荡器。

9. 发明授权

US5289541A Interdiction method and apparatus with constant blanking and variable dwell times 失效
标题翻译：具有恒定消隐和可变停留时间的截断方法和装置
公开(公告)号：US5289541A
公开(公告)日：1994-02-22
申请号：US896709
申请日：1992-06-10
申请人： Mark E. Schutte , Lamar E. West, Jr.
发明人： Mark E. Schutte , Lamar E. West, Jr.
IPC分类号： H04N7/16 , H04N7/167
CPC分类号： H04K3/825 , H04K3/41 , H04K3/42 , H04N7/166 , H04K2203/14
摘要： An off-premises method and apparatus for the interdiction of unauthorized channels of a broadband cable television signal includes common circuitry for adjusting the amplitude and equalization levels of the broadband CATV signals and one or more subscriber modules for generating jamming signals of different frequencies which are used to interdict one or more unauthorized channels. Each subscriber module is associated with a subscriber and is programmable and addressable to adjust the jamming parameters of that subscriber independently of other subscribers. Each subscriber module circuit comprises a plurality of latches, each of which is associated with one of a plurality of digital to analog converters. Each of the digital to analog converters drives one or more frequency agile oscillators with its analog output to generate the jamming signals. The subscriber module is based on a sequential state machine which loads frequency control words corresponding to the jammed channels from a frequency control memory into each latch on a cyclic basis. The basic cycle of the jamming machine includes the blanking of the frequency agile oscillator, the loading of a frequency control word into an associated latch and digital to analog converter to hop the oscillator to the next frequency, and then the unblanking of the oscillator to generate the new frequency. The state machine is adapted to vary the hopping rate, the frequency at which the system moves from channel to channel, to provide flexibility in providing various jamming effectiveness. The hopping rate is programmable and addressable and can be adjusted over a considerable range without affecting the substantially constant blanking period between hops.
摘要翻译：用于拦截宽带有线电视信号的未授权信道的非处所方法和装置包括用于调整宽带CATV信号的幅度和均衡水平的公共电路以及用于产生使用的不同频率的干扰信号的一个或多个用户模块阻止一个或多个未授权渠道。每个用户模块与订户相关联，并且是可编程的并且可寻址，以独立于其他用户来调整该用户的干扰参数。每个用户模块电路包括多个锁存器，每个锁存器与多个数模转换器中的一个相关联。每个数模转换器通过其模拟输出驱动一个或多个频率敏捷振荡器，以产生干扰信号。订户模块基于顺序状态机，其将频繁控制存储器中对应于干扰信道的频率控制字逐个加载到每个锁存器中。干扰机的基本周期包括频率敏捷振荡器的消隐，将频率控制字加载到相关的锁存器和数模转换器中，以将振荡器跳到下一个频率，然后振荡器的非空化产生新频率。状态机适于改变跳频率，系统从频道向频道移动的频率，以提供提供各种干扰效果的灵活性。跳频率可编程和可寻址，并且可以在相当大的范围内进行调整，而不会影响跳数之间的基本恒定的消隐周期。

10. 发明授权

US5251220A Method and apparatus for error detection and processing 失效
标题翻译：用于错误检测和处理的方法和装置
公开(公告)号：US5251220A
公开(公告)日：1993-10-05
申请号：US619364
申请日：1990-11-28
申请人： Mark E. Schutte
发明人： Mark E. Schutte
IPC分类号： G06F11/00 , H04N7/173
CPC分类号： G06F11/0757 , H04N7/17363
摘要： An Off-premises CATV system having an interdiction apparatus includes a remote microprocessor which receives commands and data from the headend over the cable distribution plant. The data is in a modified Manchester format (biphase-M) at 19.2 K baud which is then frequency modulated on a carrier of 108.2 MHz. A receiver detects the base band signal and outputs a serial digital signal to one input port pin of the microprocessor. The microprocessor rejects incorrect messages by measuring the duration between the negative transitions in the data signal. For those negative transitions which do not fall within predetermined windows where data transitions or a start of message character should be, an error is detected and the message is discarded.
摘要翻译：具有遮断装置的非本地CATV系统包括远程微处理器，其通过电缆分配装置从头端接收命令和数据。该数据在19.2K波特处于修改的曼彻斯特格式（双相M），然后在108.2MHz的载波上进行频率调制。接收机检测基带信号，并将串行数字信号输出到微处理器的一个输入端口引脚。微处理器通过测量数据信号中的负变化之间的持续时间来拒绝错误的消息。对于不落在数据转换或消息字符开始的预定窗口内的那些负转移，检测到错误并且消息被丢弃。

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