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    • 2. 发明授权
    • Transmit and receive protection circuit
    • 发送和接收保护电路
    • US06973153B1
    • 2005-12-06
    • US09516820
    • 2000-03-01
    • Scott W. McLellan
    • Scott W. McLellan
    • H04B1/48H04L23/00
    • H04B1/48Y10T307/391Y10T307/445Y10T307/845
    • A transmit and receive protection circuit for use in a communication system is disclosed. The protection circuit uses a four-diode gate in which the currents through an input portion and an output portion of the diode gate are individually controlled by resistors located in their respective portions. This arrangement allows the DC currents through each portion to be independently controlled. By using resistors to independently control the DC currents through each portion of the diode gate, better control over the individual DC currents can be achieved, leading to effective AC resistances which are more predictable. This arrangement results in a predictable low loss protection circuit at a minimal expense.
    • 公开了一种用于通信系统的发送和接收保护电路。 保护电路使用四极二极管栅极,其中通过二极管栅极的输入部分和输出部分的电流由位于其各自部分的电阻器分别控制。 这种布置允许通过每个部分的直流电流被独立地控制。 通过使用电阻来独立地控制通过二极管栅极的每个部分的直流电流,可以实现对各个直流电流的更好的控制,从而导致更可预测的有效的交流电阻。 这种安排以最小的费用导致可预测的低损耗保护电路。
    • 8. 发明授权
    • Network controlled telephone for the visually impaired
    • 为视障者提供网络控制电话
    • US6097800A
    • 2000-08-01
    • US264669
    • 1999-03-09
    • Scott W. McLellan
    • Scott W. McLellan
    • H04M17/00
    • H04M17/00H04M17/02H04M17/10H04M17/106H04M3/382
    • A networked controlled telephone system and method for the visually impaired. The system and method provides a visually impaired caller with a calling card and calling card account. The system and method stores a predetermined list of authorized telephone numbers for the calling card. Calls made to the telephone numbers on the predetermined list are the only calls that can be charged to the calling card without adding a further personal identification number. If the user desires to call a telephone number not on the list, the personal identification number is entered prior to entering the telephone number. Thus, the financial risk attributable to calling card theft greatly reduced for both the owner and service provider. Moreover, simplified codes are associated and stored with each predetermined telephone number. When a visually impaired caller uses the card to place calls, the caller need only enter the simplified code to place the call. Thus, the calling card is suitable for use by a visually impaired caller.
    • 一种用于视力障碍者的联网控制电话系统和方法。 系统和方法为视障者提供一个电话卡和电话卡账户。 系统和方法存储用于呼叫卡的授权电话号码的预定列表。 对预定列表上的电话号码进行的呼叫是在不添加另外的个人识别号码的情况下可以向呼叫卡收费的唯一呼叫。 如果用户希望呼叫不在列表上的电话号码,则在输入电话号码之前输入个人识别号码。 因此,所有者和服务提供商对归属于电话卡窃取的财务风险大大降低。 此外,简化的代码与每个预定的电话号码相关联并存储。 当视力受损的呼叫者使用该卡进行呼叫时,呼叫者只需输入简化的代码来进行呼叫。 因此,呼叫卡适合视力受损的呼叫者使用。