Publication Date: 2018-Jun-06
The IP.com Prior Art Database
Paralegal CPA Global - IPSS
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Various types of triggers can be used to produce time domain or frequency domain representations of a signal on a display screen of a test instrument. For example, an amplitude-based trigger can be used to display a time domain representation of a signal upon an oscilloscope screen. The amplitude-based trigger generates a display of the signal on the oscilloscope screen each time an amplitude of the signal exceeds the trigger amplitude. In some applications, the amplitude-based trigger may be supplemented or replaced by other types of triggers such as an edge-based trigger or a pulse width-based trigger. For example, when a combination of an amplitude-based trigger and a rising edge-based trigger is used, a signal is displayed on the display screen of the oscilloscope when a rising edge of the signal exceeds the trigger amplitude. In another example, when a combination of an amplitude-based trigger and a falling edge-based trigger is used, a signal is displayed on the display screen when a falling edge of the signal falls below the trigger amplitude. In yet another example, when a pulse width-based trigger is used, a signal is displayed on the display screen of the oscilloscope when the width of a signal pulse exceeds a pulse width, and an amplitude of the signal pulse exceeds a threshold amplitude, specified by the pulse width-based trigger.
Signals can be viewed in the frequency domain by using certain types of frequency-based triggers. For example, some signals can be viewed on a screen of a signal analyzer by using a frequency mask trigger. The frequency mask trigger produces a real-time display of the signal on the screen of the signal analyzer whenever a particular spectral component of the signal violates a power level indicated by the frequency mask trigger. The frequency mask trigger may be supplemented by using various conditions for qualifying a trigger event. For example, one condition involves validating a frequency mask trigger by verifying that the signal exceeds the power level indicated by the frequency mask trigger a specified number of times. In another example, another condition involves validating a frequency mask trigger by verifying that the signal exceeds the power level indicated by the frequency mask trigger for a specified period of time.
The frequency mask triggers described above may be appropriate for certain types of applications. However, such frequency mask triggers are static in nature and may not accurately track dynamic signals that change in frequency and/or amplitude over time. A traditional single frequency mask trigger can be useful if the signal of interest occurs repetitively at the same frequency. However, in many applications, FFTs may be derived from a signal that varies in frequency and/or bandwidth across a frequency spectrum. Using the traditional single frequency mask trigger upon such FFTs provides sporadic and non-comprehensive trigge...