Rolling code identification scheme for remote control applications
    2.
    发明授权
    Rolling code identification scheme for remote control applications 失效
    遥控应用的滚动码识别方案

    公开(公告)号:US5598475A

    公开(公告)日:1997-01-28

    申请号:US408874

    申请日:1995-03-23

    摘要: A remote control access system uses a transmitter and a receiver. The transmitter generates an encrypted identification code which the receiver decrypts and grants access to the system if the decrypted code matches an identification code stored in the receiver. The encryption occurs by taking a 40 bit identification code and forming 5 bytes (8 bytes each). The 5 bytes are logic exclusive OR'd to form a 5 byte wide encrypted code. Decryption occurs by performing the opposite exclusive OR operation on the 5 byte wide encrypted code to convert it back to the 5 byte identification code. The 4 most significant bytes of the decrypted code are compared against the 4 most significant bytes of the previous stored decrypted code in the receiver. If the comparison yields a zero, this means the least significant byte will be within 2.sup.8 or 256 of each other and access will be granted.

    摘要翻译: 遥控接入系统使用发射机和接收机。 如果解密的码匹配存储在接收机中的识别码,则发射机产生加密的识别码,接收者解密并授权接入系统。 通过取40位识别码并形成5个字节(每个8个字节)进行加密。 这5个字节是逻辑异或,以形成一个5字节宽的加密代码。 通过对5字节宽的加密代码执行相反的异或运算将其转换回5字节识别码来进行解密。 将解密码的4个最高有效字节与接收机中先前存储的解密码的4个最高有效字节进行比较。 如果比较产生零,这意味着最低有效字节将在彼此的28或256之间,并且访问将被授予。

    Method of preventing unauthorized reproduction of a transmission code
    4.
    发明授权
    Method of preventing unauthorized reproduction of a transmission code 失效
    防止未授权再现传输码的方法

    公开(公告)号:US6046680A

    公开(公告)日:2000-04-04

    申请号:US260148

    申请日:1994-06-15

    IPC分类号: G07C9/00 G08C19/28 H04Q1/00

    摘要: An integrated circuit (IC) configurable as transmitter/receiver includes a method of preventing unauthorized learning and reproduction of an access code as a security measure. When the IC is configured as a receiver and placed in the learn mode, a flag is set in a memory of a microcontroller. If later configured as a transmitter, the microcontroller checks the flag upon power up and if the flag is set, the stored code is randomized so transmission of it is impossible.

    摘要翻译: 可配置为发射机/接收机的集成电路(IC)包括防止作为安全措施的接入码的未授权学习和再现的方法。 当IC被配置为接收器并置于学习模式时,在微控制器的存储器中设置标志。 如果稍后配置为发送器,则上电时微控制器检查标志,如果标志置位,则存储的代码是随机的,因此不可能进行传输。

    Serial code format optimized for remote control applications over noisy
communications channel
    5.
    发明授权
    Serial code format optimized for remote control applications over noisy communications channel 失效
    通过嘈杂的通信通道为远程控制应用优化的串行代码格式

    公开(公告)号:US5572555A

    公开(公告)日:1996-11-05

    申请号:US259820

    申请日:1994-06-15

    摘要: A transmitted data stream in a remote control system is a serial data stream having a synchronization sequence and a data sequence. The data sequence is encoded into a symbol comprised of a series of data bits wherein a 110 may represent a logic 1 and a 011 may represent a logic 0. A self adaptive filter adjusts its gain and offset to determine the duration of one bit. Providing a serial code format wherein the synchronization sequence has a smiller duty cycle as the duty cycle of a symbol aids the self adaptive filter to set its threshold switching level accurately and quickly, thus aiding the receiver to decode the transmitted data stream.

    摘要翻译: 远程控制系统中的传输数据流是具有同步序列和数据序列的串行数据流。 数据序列被编码成由一系列数据位组成的符号,其中110可以表示逻辑1,011可以表示逻辑0.自适应滤波器调整其增益和偏移量以确定一位的持续时间。 提供串行码格式,其中同步序列具有作为符号的占空比的抽头占空比,有助于自适应滤波器准确而快速地设置其阈值切换电平,从而帮助接收机解码传输的数据流。

    Polyurethane foam-fiber composites
    6.
    发明授权
    Polyurethane foam-fiber composites 失效
    聚氨酯泡沫纤维复合材料

    公开(公告)号:US4683246A

    公开(公告)日:1987-07-28

    申请号:US839714

    申请日:1986-03-14

    摘要: Polyurethane foam-fiber composite structures comprising a flexible polyurethane foam uniformly mixed with a fibrous material and bonded with a liquid flexible resinous binding agent to provide a cured foam structure; the relative amounts of materials in the foam structure being such that for each 100 parts by weight of polyurethane foam particles about 10 to 500 parts of fibrous material and about 10 to 250 parts of binding agent is employed, the fibrous material having a fiber length of from 1/8" to 4" and preferably 1/4" to 3/4", a density of at least 0.75, and a diameter of less than 500 microns. The foam structures have an excellent sag factor with good resiliency for a select density.

    摘要翻译: 聚氨酯泡沫纤维复合结构,其包含与纤维材料均匀混合并与液体柔性树脂粘合剂结合以提供固化泡沫结构的柔性聚氨酯泡沫; 泡沫结构中的材料的相对量使得对于每100重量份的聚氨酯泡沫颗粒使用约10至500重量份的纤维材料和约10至250重量份的粘合剂,纤维材料的纤维长度为 从1/8“至4”,优选1/4“至3/4”,密度至少为0.75,直径小于500微米。 泡沫结构具有优异的松弛因子,对于选择密度具有良好的弹性。

    Process for making foam-in-form polyurethane foam buns and apparatus
therefor
    9.
    发明授权
    Process for making foam-in-form polyurethane foam buns and apparatus therefor 失效
    泡沫塑料泡沫塑料泡罩的制造方法及其设备

    公开(公告)号:US4591469A

    公开(公告)日:1986-05-27

    申请号:US696523

    申请日:1985-01-30

    摘要: An improved method for manufacturing a foam-filled polyurethane foam bun from foam particles having uniformly dispersed therewith large amounts of solid material bonded together with new polyurethane foam is described. The method comprises uniformly applying a liquid flexible polyurethane foam-forming material to a dispersion of foam particles and solid material to provide a blend, distributing the blend within a mold, and foaming and curing the foam-forming material by a plurality of steaming steps wherein the mold is flipped from a first to second position between steaming steps. The foam buns have a uniform density gradient. Foam buns are disclosed having a variation in density across the foam bun. There is also disclosed an improved char-forming foam obtained as a result of using boric acid in the foam-forming formulation.

    摘要翻译: 描述了由具有均匀分散的大量固体材料与新的聚氨酯泡沫结合在一起的泡沫颗粒制造泡沫填充的聚氨酯泡沫薄片的改进方法。 该方法包括将液体柔性聚氨酯泡沫形成材料均匀地施加到泡沫颗粒和固体材料的分散体上以提供共混物,将共混物分布在模具内,并通过多个蒸汽步骤使泡沫形成材料发泡和固化,其中 模具在蒸汽步骤之间从第一位置翻转到第二位置。 泡沫面包具有均匀的密度梯度。 公开了泡沫面包在泡沫薄片上的密度变化。 还公开了通过在泡沫形成制剂中使用硼酸获得的改进的形成炭的泡沫体。