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Crest Factor
The relative phases of the constituent tones with respect to each other determine the crest factor of a multitone signal with specified amplitude. The crest factor is the ratio of the peak magnitude to the RMS value of the signal.
- 2 minute(s) read
- Last Updated2023-02-21
- Manual: LabWindows/CVI
DC Overlapped with Single Tone
Consider the case where the signal you measure is composed of a DC signal and a single sine tone. The average of a single period of the sine tone is ideally zero because the positive half-period of the tone cancels
- 1 minute read
- Last Updated2023-02-21
- Manual: LabWindows/CVI
DC Plus Sine Tone
The following figure shows that for a 1.0 VDC signal overlapped with a 0.5 V single sine tone, the worst ENOD increases with measurement time—x-axis shown in periods of the additive sine tone—at a rate of approximately one additional digit...
- 1 minute read
- Last Updated2023-02-21
- Manual: LabWindows/CVI
Low Sidelobe
The Low Sidelobe window reduces the level of the side lobe at the cost of broadening the main lobe. The following equation defines the Low Sidelobe window.
- 1 minute read
- Last Updated2023-02-21
- Manual: LabWindows/CVI
LU Factorization
The LU factorization technique factors the input square matrix A as the product of two triangular matrices, such that A = LU, where L is a lower triangular matrix with ones on the diagonal, and U is an upper triangular...
- 1 minute read
- Last Updated2023-02-21
- Manual: LabWindows/CVI
Windows for Spectral Analysis versus Windows for Coefficient Design
Spectral analysis and filter coefficient design place different requirements on a window. Spectral analysis requires a DFT-even window, while filter coefficient design requires a window symmetric about its midpoint.
- 1 minute read
- Last Updated2023-02-21
- Manual: LabWindows/CVI
Designing FIR Filters
You design FIR filters by approximating the desired frequency response of a discrete-time system. The most common techniques approximate the desired magnitude response while maintaining a linear-phase response. Linear-phase response implies that all frequencies in the system have the same...
- 1 minute read
- Last Updated2023-02-21
- Manual: LabWindows/CVI
Complex Operations Class Help
This class contains functions that perform arithmetic operations on complex numbers and 1D complex arrays.
- 1 minute read
- Last Updated2023-02-21
- Manual: LabWindows/CVI
Windows Class Help
This class contains functions that apply windows to an input signal. You can use these functions to reduce the truncation effect normally encountered in data acquisition.
- 1 minute read
- Last Updated2023-02-21
- Manual: LabWindows/CVI
Designing Narrowband FIR Filters
Using conventional techniques to design FIR filters with especially narrow bandwidths can result in long filter lengths. FIR filters with long filter lengths often require long design and implementation times and are susceptible to numerical inaccuracy. In some cases, conventional...
- 2 minute(s) read
- Last Updated2023-02-21
- Manual: LabWindows/CVI