-
公开(公告)号：US4584696A
公开(公告)日：1986-04-22
申请号：US664621
申请日：1984-10-25
申请人： Robert H. Beeman , Paul U. Lind
发明人： Robert H. Beeman , Paul U. Lind
CPC分类号： H04L25/03019
摘要： A circuit arranged to measure and correct for transmission line induced disturbances at discrete intervals after receipt of a header pulse by recording the presence of any voltage deviating from a set level. These levels are registered and during receipt of the data pulses are utilized at times corresponding to the relative position of the preceding data pulses to modify subsequent data bits.
摘要翻译： 一种电路，被布置成通过记录任何偏离设定电平的电压的存在来测量和校正在接收到头部脉冲之后的离散间隔处的传输线感应干扰。 这些电平被登记，并且在接收到数据脉冲期间，在与先前的数据脉冲的相对位置对应的时间使用脉冲以修改后续的数据位。
-
公开(公告)号：US4486627A
公开(公告)日：1984-12-04
申请号：US449339
申请日：1982-12-13
摘要： An arrangement for monitoring the admittance of a line during a frequency sweep is disclosed which upon detection of the characteristic admittance level determines the loaded or unloaded status of a transmission line. Output logic associated with detection circuits provides a digital indication of the status detected.
摘要翻译： 公开了一种用于在频率扫描期间监测线路的导纳的装置，其在检测到特征导纳水平确定传输线路的加载或卸载状态时。 与检测电路相关的输出逻辑提供所检测状态的数字指示。
-
公开(公告)号：US3946164A
公开(公告)日：1976-03-23
申请号：US473851
申请日：1974-05-28
申请人： Robert H. Beeman
发明人： Robert H. Beeman
IPC分类号： H04M19/02
CPC分类号： H04M19/02
摘要： A circuit for generating precise tone signals for use in telecommunications systems, such as dial tone, busy tone, ringback tone, etc. the circuit provides tone signals at a level suitable for application for distribution throughout a telephone central office. A facility for providing interrupt of the signals at either a 60 or 120 IPM rate is included.
摘要翻译： 用于生成用于电信系统中的精确音调信号的电路，例如拨号音，忙音，回铃音等。该电路以适合于在整个电话中心局分发的应用的级别提供音频信号。 包括以60或120 IPM速率提供信号中断的设施。
-
公开(公告)号：US4590601A
公开(公告)日：1986-05-20
申请号：US685702
申请日：1984-12-24
申请人： Robert H. Beeman
发明人： Robert H. Beeman
CPC分类号： H04J3/0611
摘要： This invention is a circuit for detecting a framing pattern consisting of a pseudo random shift register sequence. This circuit utilizes an extremely long framing pattern without either a large amount of memory or the need to receive a large number of bits in order to recognize the framing pattern. The use of lengthy framing patterns minimizes the chance of false framing caused by patterns in bit positions other than the framing bit position. In addition, the incoming data stream may be connected directly to the shift register mechanism.
摘要翻译： 本发明是用于检测由伪随机移位寄存器序列组成的成帧模式的电路。 该电路使用非常长的成帧模式，而不需要大量的存储器或者需要接收大量的位以识别成帧模式。 使用长度的成帧模式可以最大限度地减少除了帧位位置之外的位位置中的模式引起的伪成帧的机会。 此外，输入数据流可以直接连接到移位寄存器机构。
-
公开(公告)号：US4018991A
公开(公告)日：1977-04-19
申请号：US644668
申请日：1975-12-29
申请人： Robert H. Beeman
发明人： Robert H. Beeman
CPC分类号： H04Q1/457
摘要： A parity checking circuit for use in multifrequency tone receivers is disclosed wherein associated receivers are made less susceptible to digit simulation when talking is present, by verifying that the same two tones are present for the entire parity timing period.
摘要翻译： 公开了一种用于多频音频接收机的奇偶校验电路，其中通过在整个奇偶校验定时周期中验证相同的两个音调的存在，使相关的接收机在通话存在时对数字模拟的影响较小。
-
公开(公告)号：US06144734A
公开(公告)日：2000-11-07
申请号：US107313
申请日：1998-06-30
申请人： Robert H. Beeman
发明人： Robert H. Beeman
CPC分类号： H04M11/062
摘要： A transmission system includes a transmission path from a transmitting station to a receiving station for both voice telephone service occupying the frequency spectrum below a predetermined frequency f.sub.1 and for data service occupying the frequency spectrum above another predetermined frequency f.sub.3, where f.sub.3 is substantially higher than f.sub.1, a plurality of telephone sets at said receiving station connected in parallel with one another to the transmission path, and where each of the telephone sets has an on-hook state which presents a substantially infinite resistance to the transmission path and an off-hook state which presents a predetermined resistance R to the transmission path. A plurality of separate and substantially identical multi-pole low-pass filters are provided for connection between the transmission path and respective ones of the telephone sets, where each of the low-pass filters has a -3 dB frequency f.sub.2 which lies between f.sub.1 and f.sub.3, and a characteristic impedance of substantially (n*R), where n is a number equal to at least 2.4, thereby reducing the effect of low impedances that develop at frequencies below f.sub.1 because of resonances that occur between f.sub.1 and f.sub.2 with at least one but less than all of said telephone sets off-hook.
摘要翻译： 传输系统包括从发射站到接收站的传输路径，用于占用低于预定频率f1的频谱的语音电话服务，以及占用高于另一预定频率f3的频谱的数据服务，其中f3基本上高于f1 ，在所述接收站处的多个电话机彼此并行连接到传输路径，并且其中每个电话机具有挂载状态，其呈现对传输路径的基本上无限的阻力和摘机状态 其向传输路径呈现预定的电阻R。 提供了多个单独且基本上相同的多极低通滤波器，用于在传输路径和各个电话机之间连接，其中每个低通滤波器具有-3dB频率f2，其位于f1和 f3和基本上（n * R）的特性阻抗，其中n是等于至少2.4的数量，从而降低在f1以下的频率下产生的低阻抗的影响，因为至少在f1和f2之间发生共振 一个但不到所有的电话机摘机。
-
公开(公告)号：US4719643A
公开(公告)日：1988-01-12
申请号：US908888
申请日：1986-09-15
申请人： Robert H. Beeman
发明人： Robert H. Beeman
CPC分类号： H04L7/043
摘要： This invention is a circuit for generating a framing pattern consisting of a pseudo random shift register sequence. This circuit utilizes an extremely long framing pattern without either a large amount of memory or the need to receive a large number of bits in order to recognize the framing pattern. The use of lengthy framing patterns minimizes the chance of false framing caused by patterns in bit positions other than the framing bit position.
摘要翻译： 本发明是一种用于产生由伪随机移位寄存器序列组成的成帧模式的电路。 该电路使用非常长的成帧模式，而不需要大量的存储器或者需要接收大量的位以识别成帧模式。 使用长度的成帧模式可以最大限度地减少除了帧位位置之外的位位置中的模式引起的伪成帧的机会。
-
公开(公告)号：US4771463A
公开(公告)日：1988-09-13
申请号：US938319
申请日：1986-12-05
申请人： Robert H. Beeman
发明人： Robert H. Beeman
CPC分类号： H04L25/03866
摘要： The present invention describes a circuit which allows a data stream to be scrambled by continuously running uninterrupted Pseudo Random sequence without multiplying errors. This is accomplished by allowing a register in the Pseudo Random scrambling receiver to acquire synchronization with a register in the Pseudo Random scrambling transmitter such that the two registers run independently through the same maximal length Pseudo Random sequence without further need for communication with each other. Bit errors occurring between the transmitter and receiver do not cause the scrambling registers at the two ends to become out of synchronization and they remain in synchronism unless a timing slip occurs to cause the transmitter and receiver to lose synchronization. While the present invention is primarily directed toward providing a circuit for performing maximal length Pseudo Random scrambling without error multiplication, the invention is particularly advantageous in reducing the error rate under conditions in which a majority of the error bursts are comprised of one or a small number of error bits such as occurs in transmission loops where impulse noise is a problem.
摘要翻译： 本发明描述了一种电路，其允许通过连续运行不间断的伪随机序列来扰乱数据流而不产生误差。 这是通过允许伪随机扰频接收机中的寄存器获得与伪随机扰频发射机中的寄存器的同步，使得两个寄存器通过相同的最大长度伪随机序列独立运行，而不需要彼此通信。 在发送器和接收器之间发生的位错误不会导致两端的加扰寄存器变得不同步，并且它们保持同步，除非发生定时滑移以使发送器和接收器失去同步。 虽然本发明主要涉及提供一种用于执行无错误乘法的最大长度伪随机扰乱的电路，但是本发明特别有利于在大多数错误突发由一个或少数个数组成的条件下降低错误率 的错误位，例如发生在脉冲噪声问题的传输环路中。
-
公开(公告)号：US4590600A
公开(公告)日：1986-05-20
申请号：US664623
申请日：1984-10-25
申请人： Robert H. Beeman , Paul U. Lind
发明人： Robert H. Beeman , Paul U. Lind
CPC分类号： H04L25/063 , H04B3/04
摘要： A level comparator is used to check the incoming message header pulse amplitude and if it is of a level higher than an established level a signal is transmitted to update a digital counter whose digital output is converted by a digital to analog converter to establish an increased analog reference level. If the incoming message header is lower the counter is decremented to establish a lower reference level. Then the levels of any signals present at fixed intervals after the header or sync pulse are measured and recorded. These measured levels constitute the value of correction required for subsequent pulses and are added to or subtracted from following data pulses as required.
摘要翻译： 电平比较器用于检查输入消息报头脉冲幅度，并且如果其高于建立电平的电平，则发送信号以更新数字计数器，其数字输出由数模转换器转换以建立增加的模拟 参考级别。 如果传入的消息报头较低，则计数器递减以建立较低的参考级别。 然后测量并记录在报头或同步脉冲之后以固定间隔存在的任何信号的电平。 这些测量电平构成后续脉冲所需的校正值，并根据需要加入或从后续数据脉冲中减去。
-
公开(公告)号：US4272721A
公开(公告)日：1981-06-09
申请号：US967340
申请日：1978-12-07
申请人： Robert H. Beeman
发明人： Robert H. Beeman
CPC分类号： H03M1/1023
摘要： A circuit for monitoring the alignment of analog-to-digital converters. The digital output signal from a converter under test is separated into positive and negative component signals which are compared by a subtraction circuit. A difference signal is then generated by the subtraction circuit to represent the required converter adjustment. Also included are adder circuitry for a sum output and provisions for analog display.
摘要翻译： 用于监视模数转换器对准的电路。 来自被测转换器的数字输出信号被分成正和负分量信号，通过减法电路进行比较。 然后由减法电路产生差分信号以表示所需的转换器调整。 还包括用于和输出的加法器电路和用于模拟显示的装置。
-
-
-
-
-
-
-
-
-
搜索结果
10 条记录 (耗时 0.012 秒)
