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公开(公告)号：US4694482A
公开(公告)日：1987-09-15
申请号：US921526
申请日：1986-10-22
CPC分类号： H04Q1/4575
摘要： A digital progess tone detector, for connection to a telephone line and a PABX, comprising circuitry for generating one or more reference tones having user definable frequencies and performing single frequency discrete Fourier transforms on one or more signals received from the telephone line at the defined frequencies, and providing an output signal to the PABX in response thereto. The output signal provides an indication of whether or not a predetermined one or more progress tone frequencies have been detected in the received signals. Because the generated reference tone frequencies are user definable, the present invention can be easily adapted for use in various foreign countries having different progress tone frequency requirements. A preferred embodiment of the invention is implemented on a single microcomputer chip in conjunction with peripherals (such as codecs, crosspoint switches, etc.). The progress tone detector is simple, small and inexpensive, thus conforming to the miniaturization and cost efficiency requirements of modern day PABX circuits.
摘要翻译： 一种用于连接到电话线路和PABX的数字渐进音检测器，包括用于产生具有用户可定义频率的一个或多个参考音调并且以定义的频率对从电话线接收的一个或多个信号执行单频离散付里叶变换的电路 并且响应于此向PABX提供输出信号。 输出信号提供在接收到的信号中是否已经检测到预定的一个或多个进行音频率的指示。 由于所生成的参考音频率是用户可定义的，因此本发明可以容易地适用于具有不同进度音频要求的各个国家。 结合外围设备（如编解码器，交叉点开关等），在单个微型计算机芯片上实现本发明的优选实施例。 进度音检测器简单，小巧便宜，符合现代PABX电路的小型化和成本效益要求。
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公开(公告)号：US4669114A
公开(公告)日：1987-05-26
申请号：US705679
申请日：1985-02-26
CPC分类号： H04Q1/4575
摘要： A digital progress tone detector, for connection to a telephone line and a PABX, comprising circuitry for generating one or more reference tones having user definable frequencies and performing single frequency discrete Fourier transforms on one or more signals received from the telephone line at the defined frequencies, and providing an output signal to the PABX in response thereto. The output signal provides an indication of whether or not a predetermined one or more progress tone frequencies have been detected in the received signals. Because the generated reference tone frequencies are user definable, the present invention can be easily adapted for use in various foreign countries having different progress tone frequency requirements. A preferred embodiment of the invention is implemented on a single microcomputer chip in conjunction with peripherals (such as codecs, crosspoint switches, etc.). The progress tone detector is simple, small and inexpensive, thus conforming to the miniaturization and cost efficiency requirements of modern day PABX circuits.
摘要翻译： 一种用于连接到电话线和PABX的数字进步音检测器，包括用于产生具有用户可定义频率的一个或多个参考音调并且以定义的频率对从电话线接收的一个或多个信号执行单频离散付里叶变换的电路 并且响应于此向PABX提供输出信号。 输出信号提供在接收到的信号中是否已经检测到预定的一个或多个进行音频率的指示。 由于所生成的参考音频率是用户可定义的，因此本发明可以容易地适用于具有不同进度音频要求的各个国家。 结合外围设备（如编解码器，交叉点开关等），在单个微型计算机芯片上实现本发明的优选实施例。 进度音检测器简单，小巧便宜，符合现代PABX电路的小型化和成本效益要求。
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公开(公告)号：US4776007A
公开(公告)日：1988-10-04
申请号：US865961
申请日：1986-05-22
CPC分类号： H04M7/0096
摘要： A trunk circuit is disclosed for coupling a bidirectional lead pair, such as balanced tip and ring leads, to a pair of unidirectional leads such as unbalanced input and output leads. The trunk circuit incorporates a small inexpensive transformer for effecting this coupling and for providing large common mode signal isolation and correct longitudinal balance. Circuitry is provided for matching the nominal balanced AC and DC line impedances. The trunk circuit also provides circuitry for generating dial pulse signals under control of a microprocessor or other external controller.
摘要翻译： 公开了用于将诸如平衡尖端和环形引线的双向引线对耦合到诸如不平衡输入和输出引线的一对单向引线的中继电路。 干线电路包含一个小型便宜的变压器，用于实现该耦合并提供大的共模信号隔离和正确的纵向平衡。 提供电路用于匹配标称平衡交流和直流线路阻抗。 中继电路还提供用于在微处理器或其它外部控制器的控制下产生拨号脉冲信号的电路。
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公开(公告)号：US4682328A
公开(公告)日：1987-07-21
申请号：US781023
申请日：1985-09-27
申请人： John R. Ramsay , Zbigniew B. Styrna
发明人： John R. Ramsay , Zbigniew B. Styrna
IPC分类号： G11C11/401 , G06F11/10 , G06F11/14 , G06F13/28 , G11C7/10 , G11C11/4096 , G11C29/00 , G11C29/42
CPC分类号： G06F11/106 , G06F11/14 , G06F13/282 , G11C11/4096 , G11C7/1006
摘要： A circuit for use in conjunction with a microprocessor for refreshing, checking and correcting data signals stored in a dynamic memory. The circuit utilizes a direct memory access controller for transferring data signals stored in successive locations of the dynamic memory to a non-existent peripheral. Data signals appearing on a data bus as a result of the data transfer, are applied to a parity checking circuit for generating an interrupt signal to the microprocessor in response to detection of parity errors in the data signal. The microprocessor then performs a data recovery routine in which correct versions of the data signal stored in a non-volatile memory, are transferred for storage in the dynamic memory under control of a microprocessor. Parity errors in data signals stored in the dynamic memory are thus corrected prior to being accessed by the microprocessor.
摘要翻译： 用于与微处理器结合使用的电路，用于刷新，检查和校正存储在动态存储器中的数据信号。 电路利用直接存储器存取控制器将存储在动态存储器的连续位置的数据信号传送到不存在的外设。 作为数据传输结果在数据总线上出现的数据信号被应用于奇偶校验电路，用于响应于数据信号中奇偶校验错误的检测而向微处理器产生中断信号。 然后微处理器执行数据恢复例程，其中存储在非易失性存储器中的数据信号的正确版本在微处理器的控制下被传送以存储在动态存储器中。 因此在存储在动态存储器中的数据信号中的奇偶校验错误在被微处理器访问之前被校正。
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公开(公告)号：US4527014A
公开(公告)日：1985-07-02
申请号：US419484
申请日：1982-09-17
申请人： Zbigniew B. Styrna
发明人： Zbigniew B. Styrna
CPC分类号： H04M9/08
摘要： An apparatus and method of controlling the loop gain in a loudspeaking telephone comprising storing reduced representations of an outgoing signal and an incoming signal in corresponding incoming and outgoing storage circuits respectively, in which the storage circuits have much faster attack times than decay times, comparing the representations, and controlling the gains of outgoing and incoming signal paths of the loop according to the degree and polarity of the result of the comparison. With the outgoing signal path connected to a microphone or a signal source and the incoming signal path connected to a loudspeaker, hands-free communication can be carried on having much more natural characteristics than in the past, devoid of most of the "hollow" sound characteristic of prior art systems.
摘要翻译： 一种用于控制扬声电话中的环路增益的装置和方法，包括分别在对应的输入和输出存储电路中存储输出信号和输入信号的缩减表示，其中存储电路具有比衰减时间快得多的攻击时间， 表示，并根据比较结果的程度和极性来控制环路输出和输入信号路径的增益。 随着输出信号路径连接到麦克风或信号源以及连接到扬声器的输入信号路径，免提通信可以具有比过去更多的自然特征，没有大部分“空心”声音 现有技术系统的特征。
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6.发明授权Data storage system for transferring last entered information from static memory to magnetic disk upon recovering from data storage interruption 失效数据存储系统，用于在从数据存储中断恢复时将最后输入的信息从静态存储器传送到磁盘
公开(公告)号：US5034915A
公开(公告)日：1991-07-23
申请号：US409966
申请日：1989-09-18
CPC分类号： G06F3/0601 , H04Q3/54533 , G06F2003/0692
摘要： A data storage system comprised of a disk drive including a magnetic disk for storing an operating system program, a dynamic RAM memory circuit for temporarily storing the operating system program, a static memory circuit for temporarily storing customer entered data, and a direct memory access controller for periodically transferring the customer entered data from the static memory circuit to the magnetic disk and for transferring the operating system program from the magnetic disk to the dynamic RAM memory circuit in response to execution of a bootstrap or power-up program by the microprocessor. In the case of a power down during entry of customer entered data, the customer entered data is saved in the static memory and is transferred to the magnetic disk during the subsequent power up thereby avoiding the use of possibly corrupted data on the disk drive.
摘要翻译： 一种数据存储系统，包括：磁盘驱动器，包括用于存储操作系统程序的磁盘;用于临时存储操作系统程序的动态RAM存储器电路;临时存储客户输入数据的静态存储电路;以及直接存储器存取控制器 用于将客户输入的数据从静态存储器电路周期性地传送到磁盘，并且响应于微处理器执行自举或加电程序将操作系统程序从磁盘传送到动态RAM存储器电路。 在进入客户输入数据时掉电的情况下，客户输入的数据被保存在静态存储器中，并在随后的上电期间被传送到磁盘，从而避免使用可能损坏的磁盘驱动器的数据。
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