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2. Phase noise - Wikipedia

   en.wikipedia.org/wiki/Phase_noise

   Phase noise is a type of cyclostationary noise and is closely related to jitter, a particularly important type of phase noise that is produced by oscillators . Phase noise ( ℒ (f)) is typically expressed in units of dBc /Hz, and it represents the noise power relative to the carrier contained in a 1 Hz bandwidth centered at a certain offsets ...

3. Spectral density - Wikipedia

   en.wikipedia.org/wiki/Spectral_density

   The spectral density of a fluorescent light as a function of optical wavelength shows peaks at atomic transitions, indicated by the numbered arrows. The voice waveform over time (left) has a broad audio power spectrum (right). In signal processing, the power spectrum of a continuous time signal describes the distribution of power into frequency ...

4. Random vibration - Wikipedia

   en.wikipedia.org/wiki/Random_vibration

   Random vibration. In mechanical engineering, random vibration is motion which is non-deterministic, meaning that future behavior cannot be precisely predicted. The randomness is a characteristic of the excitation or input, not the mode shapes or natural frequencies. Some common examples include an automobile riding on a rough road, wave height ...

5. How to edit, sign or convert a PDF - Engadget

   www.engadget.com/how-to-edit-a-pdf-143029261.html

   Luckily, Adobe allows users to combine or merge PDF documents for free. Simply drag and drop your files, select the ones you’d like to merge and then reorder them if needed. Adobe’s tool lets ...

6. Welch's method - Wikipedia

   en.wikipedia.org/wiki/Welch's_method

   Welch's method, named after Peter D. Welch, is an approach for spectral density estimation. It is used in physics, engineering, and applied mathematics for estimating the power of a signal at different frequencies . The method is based on the concept of using periodogram spectrum estimates, which are the result of converting a signal from the ...

7. Comparison of image viewers - Wikipedia

   en.wikipedia.org/wiki/Comparison_of_image_viewers

   Add Text, crop, cut/copy selected area, paste-Into selected area, paste from print screen, resize/resample, rotate, flip vertically/horizontally, JPEG lossless transformations, color adjustments, change color depth, greyscale, red-eye reduction, sharpen, effects/filters, own and 8bf (Photoshop) plugins compatibility, edit IPTC info, move, copy ...