Digital method of pulse width modulation
    1.
    发明授权
    Digital method of pulse width modulation 失效
    脉冲宽度调制的数字方法

    公开(公告)号:US4001728A

    公开(公告)日:1977-01-04

    申请号:US446258

    申请日:1974-02-27

    申请人: Wolfger Schneider

    发明人: Wolfger Schneider

    IPC分类号: H03K7/08

    CPC分类号: H03K7/08

    摘要: Disclosed is a method of encoding information in a pulse width modulated nal using totally digital techniques. An incremental ramp wave is utilized as a modulation reference, and intercepts between the modulation reference and a signal to be encoded are detected and/or predicted logically by examining the values of these two signals at predetermined intervals.

    Passive alarm system for blind and visually impaired individuals
    2.
    发明授权
    Passive alarm system for blind and visually impaired individuals 失效
    盲人和视障人士的被动报警系统

    公开(公告)号:US5933082A

    公开(公告)日:1999-08-03

    申请号:US624671

    申请日:1996-04-02

    IPC分类号: G08B21/02 G08B21/00

    CPC分类号: G08B21/02

    摘要: The device assists those who are visually handicapped and, in particular, warns blind or visually impaired travellers that they have entered a potentially dangerous area proximal to the edge of boarding platforms of the type typically found in public railway transit systems. An InfraRed Integrated Information System consists of an array of infrared transmitters and a portable detector/warning device to be held by the blind traveller. The transmitters create a beam of infrared light which bathes the section of the platform proximal to the platform edge. As the traveller moves into the region of the platform covered by the emission, the sensors in the warning device are activated and by audio, tactile or other stimuli alert the traveller of entry into the danger zone.

    摘要翻译: 该设备协助那些视力障碍者,特别是向盲人或视力障碍的旅客发出警告,他们进入靠近公共铁路运输系统中通常所见类型的登机台边缘的潜在危险区域。 InfraRed综合信息系统由一系列红外发射器和由盲人保持的便携式探测器/警告装置组成。 发射器产生一束红外光,将平台的部分靠近平台边缘。 随着旅行者移动到被排放物覆盖的平台的区域中,警告装置中的传感器被激活,并且通过音频,触觉或其他刺激来警告旅行者进入危险区域。

    Portable pH data collector
    4.
    发明授权
    Portable pH data collector 失效
    便携式pH数据采集器

    公开(公告)号:US4546436A

    公开(公告)日:1985-10-08

    申请号:US511383

    申请日:1983-07-06

    摘要: The present invention provides an apparatus for continuously recording physiological data. The invention includes a unique data mapping and compression technique which allows relatively long term data acquisition without compromising the data sampling rate. The present physiological data recorder has application in recording physiological data which is non-periodic and is characterized by "bursts" of rapid activity interspersed among relatively long periods during which there is little or no activity. The invention has specific application in recording pH data in ambulatory patients and comprises a unique data compression means, an automatic calibration means, and a digital or analogue data playback means.

    摘要翻译: 本发明提供一种用于连续记录生理数据的装置。 本发明包括独特的数据映射和压缩技术,其允许相对长期的数据采集而不损害数据采样率。 本生理数据记录器应用于记录非周期性的生理数据,其特征在于快速活动的“突发”散布在相对较长的时期内,其中很少或没有活动。 本发明具体应用于门诊患者的pH数据记录,并且包括独特的数据压缩装置,自动校准装置和数字或模拟数据重放装置。