Was besagt das Nyquist Theorem?
Nyquist-Theorem s, E Nyquist theorem, bei der analog-digital Wandlung von Biosignalen (z.B. beim Elektroencephalogramm) wichtige Regel, die besagt, daß die digital korrekt darstellbaren Frequenzen kleiner als die Hälfte der Abtastrate in Hz sind.
Warum Abtastung?
Die Abtastung, um ein zeitkontinuierliches Signal in ein zeitdiskretes Signal zu überführen. Die Quantisierung, um ein wertkontinuierliches Signal in ein wertdiskretes Signal umzuwandeln.
What does the sampling rate of Nyquist mean?
Nyquist Sampling Rate = The minimum sample rate that captures the „essence“ of the analog information. Note that while Nyquist is appropriate for sampling, it may not capture nuances in information. But, of course, those nuances are higher frequency, and thus would require a higher Nyquist sample rate. Undersampled: low sampling rate produces
How are Nyquist plots used in signal processing?
A Nyquist plot is a parametric plot of a frequency response used in automatic control and signal processing. The most common use of Nyquist plots is for assessing the stability of a system with feedback. In Cartesian coordinates, the real part of the transfer function is plotted on the X -axis. The imaginary part is plotted on the Y -axis.
How is the Nyquist plot named after Harry Nyquist?
The same plot can be described using polar coordinates, where gain of the transfer function is the radial coordinate, and the phase of the transfer function is the corresponding angular coordinate. The Nyquist plot is named after Harry Nyquist, a former engineer at Bell Laboratories .
Who is the Nyquist stability criterion named after?
The Nyquist plot is named after Harry Nyquist, a former engineer at Bell Laboratories. Assessment of the stability of a closed-loop negative feedback system is done by applying the Nyquist stability criterion to the Nyquist plot of the open-loop system (i.e. the same system without its feedback loop).