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    • 7. 发明授权
    • Test systems and methods for extended off-hook conditions on a subscriber line
    • 用户线上延长摘机状态的测试系统和方法
    • US08451980B2
    • 2013-05-28
    • US12147987
    • 2008-06-27
    • Keith C. AndersonRobert W. NavarroRamfis Rivera-Colon
    • Keith C. AndersonRobert W. NavarroRamfis Rivera-Colon
    • H04M1/24
    • H04M1/24H04M1/82H04M3/14
    • Test systems and methods are disclosed for determining the cause of an extended off-hook condition on a subscriber line. A test system as described herein measures a first resistance of the subscriber line based on a first current, and also measures a second resistance of the subscriber line based on a second current. The test system then determines the difference between the first and second resistance measurements. If the difference between the first and second resistance measurements is greater than a threshold value, such as 20 Ohms or more, then the test system determines that the extended off-hook condition is the result of an off-hook telephone on the subscriber line. If the difference is less than the threshold value, then the test system determines that the extended off-hook condition is the result of a short circuit on the subscriber line.
    • 公开了用于确定用户线路上的延长摘机状态的原因的测试系统和方法。 本文所述的测试系统基于第一电流测量用户线路的第一电阻,并且还基于第二电流测量用户线路的第二电阻。 测试系统然后确定第一和第二电阻测量之间的差异。 如果第一和第二电阻测量之间的差异大于阈值(例如20欧姆或更大),那么测试系统确定延长摘机状态是用户线上摘机电话的结果。 如果差值小于阈值,则测试系统确定延长摘机状态是用户线上短路的结果。
    • 10. 发明授权
    • Muting device and muting method
    • 静音设备和静音方式
    • US08125568B2
    • 2012-02-28
    • US11784668
    • 2007-04-09
    • Tatsumi Mori
    • Tatsumi Mori
    • H04N3/24
    • H03G3/342H04M1/82
    • A muting device includes an external sound input unit that receives an external sound and an internal sound input unit that only receives an internal sound. The external sound received by the external sound input unit has a component, which corresponds to the internal sound received by the internal sound input unit, removed therefrom. Only when the signal level of a specific kind of external sound sampled from the external sound having the internal sound component thereof removed therefrom is equal to or larger than a certain signal level, the internal sound is automatically muted. Consequently, there is provided a muting device that autonomously and accurately mutes an internal audio output responsively to a specific external sound such as a telephone ring while being unaffected by an internal sound.
    • 静音装置包括接收外部声音的外部声音输入单元和仅接收内部声音的内部声音输入单元。 由外部声音输入单元接收的外部声音具有与内部声音输入单元接收到的内部声音对应的分量,从而从其中移除。 只有当从具有从其去除内部声音成分的外部声音采样的特定类型的外部声音的信号电平等于或大于某个信号电平时,内部声音被自动静音。 因此,提供了一种静音装置,它能够在不受内部声音影响的情况下自动地和精确地将内部音频输出静音地响应于特定的外部声音,例如电话铃。