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公开(公告)号：US4672605A
公开(公告)日：1987-06-09
申请号：US591509
申请日：1984-03-20
CPC分类号： H04L1/0071 , H03M5/12 , H04B1/69 , H04L1/004 , H04M11/062 , Y02B60/36
摘要： A high speed and relatively error free communications system is disclosed which enables the high speed transmission of data at a 19.2 kilobit per second rate. The data is transmitted over the same communications medium as voice transmissions, the data transmission being virtually imperceptible to the user of the analog telephone system. Connection to and from the data terminals is made through an RS232C interface. A spread spectrum technique is utilized which "whitens" the signals of the data terminal regardless of whether the terminal is idle, transmitting or receiving data. Virtual error free transmission is achieved by interleaving bits, so that noise does not destroy the data, and by error detection and correction techniques which assure that the data, as received, is identical to that transmitted. By using a variable pseudo random code, privacy of data communications are enhanced and cross-talk is substantially eliminated. The resulting system is one that can use a single twisted pair wire for transmission and is capable of transmitting data at a high rate of speed while leaving the analog voice transmission resident and unaffected on the line.
摘要翻译： 公开了一种高速且相对无差错的通信系统，其能够以19.2千比特/秒速率高速传输数据。 数据通过与语音传输相同的通信介质进行传输，数据传输对于模拟电话系统的用户实际上是不可察觉的。 通过RS232C接口连接数据终端。 利用扩频技术，无论终端是空闲，发送还是接收数据，都会使数据终端的信号“白化”。 通过交错比特来实现虚拟无错误传输，使得噪声不破坏数据，并且通过错误检测和校正技术确保所接收的数据与发送的数据相同。 通过使用可变伪随机码，数据通信的隐私被增强，并且基本上消除了串扰。 所得到的系统是可以使用单根双绞线进行传输的系统，并且能够以高速率传输数据，同时使模拟语音传输驻留在线路上并且不受影响。
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2.发明授权
公开(公告)号：US5260704A
公开(公告)日：1993-11-09
申请号：US712160
申请日：1991-05-31
申请人： Charles H. Hustig , Donald W. Moses , Robert S. Bradford , Jeffrey L. Ward , Wayne P. Olson , Janice L. Cox , Raymond S. Miller , Robert W. Moses , James M. Kresse
发明人： Charles H. Hustig , Donald W. Moses , Robert S. Bradford , Jeffrey L. Ward , Wayne P. Olson , Janice L. Cox , Raymond S. Miller , Robert W. Moses , James M. Kresse
CPC分类号： G06F17/17
摘要： A direct power output digital to analog conversion of digital audio signals operates to directly convert digital audio signals into an analog power audio output signal capable of driving a speaker, such that there is no need for further amplification or modification of the audio output signal after the direct power output digital to analog conversion of the digital audio signals. The direct power output digital to analog conversion incorporates a digital-to-analog converter within the same feedback circuit as a current-to-voltage power amplifier by using a single resistive feedback network to supply the feedback signal from the output terminal of the current-to-voltage power amplifier to the summing junction of the same current-to-voltage power amplifier.
摘要翻译： 数字音频信号的数字到模拟转换的直接功率输出操作以将数字音频信号直接转换成能够驱动扬声器的模拟功率音频输出信号，使得不需要进一步放大或修改音频输出信号 直接电源输出数字到数字音频信号的模拟转换。 直接功率输出数模转换在与电流 - 电压功率放大器相同的反馈电路内集成了数模转换器，通过使用单个电阻反馈网络来提供来自电流 - 电压功率放大器的输出端的反馈信号， 电压功率放大器到相同电流 - 电压功率放大器的求和点。
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3.发明授权
公开(公告)号：US5226000A
公开(公告)日：1993-07-06
申请号：US708912
申请日：1991-05-31
申请人： Robert W. Moses , Raymond S. Miller , Charles H. Hustig , Donald W. Moses , Robert S. Bradford , Jeffrey L. Ward , Wayne P. Olson , Janice L. Cox , James M. Kresse
发明人： Robert W. Moses , Raymond S. Miller , Charles H. Hustig , Donald W. Moses , Robert S. Bradford , Jeffrey L. Ward , Wayne P. Olson , Janice L. Cox , James M. Kresse
IPC分类号： G06F17/17
CPC分类号： G06F17/17
摘要： A method and system is provided for a digital audio system to reconstruct a digital audio signal using time domain interpolation and direct power digital-to-analog conversion. A signal processor performs the time domain interpolation on an original digital audio signal to allow for the proper recreation of the original audio signal and a direct power output digital-to-analog converter generates an analog power audio output signal from the interpolated digital audio signal that can directly drive a speaker to produce the sound waves represented by the audio output signal. The signal processor and direct power output digital-to-analog converter allow a digital audio system to more precisely reconstruct an analog power output audio signal from a digital audio signal such that there is no need for further amplification of the audio output signal and such that there will be no perceptible difference between the reconstructed digital signal and the original analog signal.
摘要翻译： 提供了一种用于数字音频系统的方法和系统，以使用时域插值和直接功率数模转换来重构数字音频信号。 信号处理器对原始数字音频信号执行时域内插以允许对原始音频信号的适当重建，并且直接功率输出数/模转换器从内插的数字音频信号产生模拟功率音频输出信号，该内插数字音频信号 可以直接驱动扬声器产生由音频输出信号表示的声波。 信号处理器和直接功率输出数模转换器允许数字音频系统从数字音频信号更精确地重建模拟功率输出音频信号，使得不需要进一步放大音频输出信号，并且使得 在重建的数字信号和原始模拟信号之间将不会有明显的差异。
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公开(公告)号：US4724435A
公开(公告)日：1988-02-09
申请号：US796052
申请日：1985-11-06
申请人： Donald W. Moses , Robert Moses , James W. Kinne , Charles H. Hustig , Wayne P. Olson , Alan M. Doberstein , Robert S. Bradford
发明人： Donald W. Moses , Robert Moses , James W. Kinne , Charles H. Hustig , Wayne P. Olson , Alan M. Doberstein , Robert S. Bradford
CPC分类号： H02J13/0072 , H04M11/002 , Y02E60/7846 , Y04S40/125
摘要： The data telemetry system disclosed is a complete data communications systems suitable for use by utilities such as electric companies, gas companies and water companies which can be used for meter reading and load management at individual subscribers premises. Elements of the system can also be used as a power load carrier in a premise specific local area network (LAN). With the system is disclosed, all 10,000 subscribers per exchange can be serviced. It will be understood that data can be multiplexed between a central office location and remote subscribers for any suitable purpose with the data system as disclosed. A packet switching structure is disclosed having eight to thirty-two bytes in the data message. This packet is routed between the utility and remote subscriber with routing headers being added and deleted as required by the network modules. Each successive layer of the multiplexing and switching hierarchy submultiplies the aggregate 10,000 channel capacity into fewer channels. Both time and space division switching and multiplexing are used.
摘要翻译： 所公开的数据遥测系统是适用于诸如电力公司，燃气公司和水公司的公用事业的完整数据通信系统，可用于各个用户场所的抄表和负载管理。 系统的元件也可以用作内部特定局域网（LAN）中的电力负载运营商。 通过系统披露，每个交换机可以维护10,000个用户。 应当理解，在所公开的数据系统的任何适当目的下，可以在中心局位置和远程用户之间复用数据。 公开了一种在数据消息中具有八到三十二个字节的分组交换结构。 该分组在实用程序和远程用户之间路由，并且根据网络模块的要求添加和删除路由头。 复合和交换层级的每个连续层将聚合的10,000个信道容量乘以较少的信道。 使用时分和空分切换和多路复用。
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公开(公告)号：US3970777A
公开(公告)日：1976-07-20
申请号：US585102
申请日：1975-06-09
申请人： Robert S. Bradford , Peter Amass
发明人： Robert S. Bradford , Peter Amass
IPC分类号： H04N5/16
CPC分类号： H04N5/16
摘要： A video compensation network is disclosed in which the pedestal level and the peak white level of a composite video signal are automatically maintained within predetermined limits. The network includes two digital/feedback loops for independently detecting and generating correction signals which are used to control the respective pedestal and peak white levels. The feedback loops are activated to make incremental adjustments to the two levels once per video field.
摘要翻译： 公开了一种视频补偿网络，其中复合视频信号的基准电平和峰值白电平自动保持在预定的限度内。 该网络包括用于独立地检测和产生用于控制相应基座和峰值白电平的校正信号的两个数字/反馈回路。 激活反馈回路以对每个视频场进行两次增量调整。
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公开(公告)号：US4426665A
公开(公告)日：1984-01-17
申请号：US445701
申请日：1982-12-01
摘要： An automatic track following feature for use with a helical video recorder is disclosed which enables reproduction of video fields at normal speeds, fast and slow forward and reverse speeds, and at stop motion, wherein a mechanism for moving a playback head transverse to the helical tracks on a magnetic tape is provided in order to enable the head to remain centered on the track regardless of tape speeds and directions of movement. A head position control signal is generated for driving the head positioning mechanism based on a comparison of a signal based on the instantaneous tape speed with a reference speed indicating signal.
摘要翻译： 公开了一种与螺旋式录像机一起使用的自动跟踪跟踪功能，其能够以正常速度，快速和慢速前进和后退速度以及停止运动再现视频场，其中，用于使播放头横向于螺旋轨道移动的机构 设置在磁带上以便能够使磁头保持在轨道上的中心，而与磁带速度和运动方向无关。 根据基于瞬时磁带速度的信号与参考速度指示信号的比较，产生用于驱动磁头定位机构的磁头位置控制信号。
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公开(公告)号：US4122500A
公开(公告)日：1978-10-24
申请号：US776586
申请日：1977-03-11
IPC分类号： G11B27/02 , G11B27/024 , G11B27/11
CPC分类号： G11B27/11 , G11B27/024 , G11B2220/90
摘要： A device for recording portions of the signals on the tape in one or more master cassettes in a desired sequence on the tape in a copy cassette. The device includes two cassette stations each including an electronically operated drive mechanism for driving the tape in a cassette at the station in either a forward or reverse direction past a record and playback head. Each station includes means for cycling the drive mechanism between forward and reverse to repetitively play a short segment of the tape in a cassette at the station, and a manually operated control for incrementally changing the segment of the tape played in each repeat cycle. By these controls an operator selects a segment of the tape in a cassette on which signals are to be copied, which segment has an end point at which signals to be added to the tape should start, and selects a segment of a tape in a master cassette from which signals are to be copied which segment has the same beginning point as the signals to be copied. Means are provided for then recording the signals from the master tape onto the copy tape with the signals at the beginning point on the master tape being recorded essentially at the end point on the copy tape.
摘要翻译： 一种用于在一个或多个主盒中的磁带上的信号的一部分以磁带上的所需顺序记录在复印盒中的装置。 该装置包括两个盒式电台，每个盒式电台都包括一个电子驱动的驱动机构，用于在电台的磁带盒中沿正向或反向的方向驱动磁带，通过记录和重放头。 每个站包括用于在前进和后退之间循环驱动机构的装置，以重复地播放站上的盒中的磁带的短段，以及用于逐渐改变在每个重复循环中播放的磁带的段的手动控制。 通过这些控制，操作员选择要在其上复制信号的盒式磁带中的片段，哪个片段具有要添加到磁带的信号应该开始的终点，并且在主器件中选择磁带的片段 要复制哪个信号的磁带，哪个段具有与要复制的信号相同的起始点。 提供了用于将来自主磁带的信号记录到复制磁带上的装置，其中主磁带上的起点处的信号基本上被记录在复制磁带上的终点处。
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