density modulation การใช้

So only electrons within a limited wavelength range near the Fermi level are scattered resulting in a density modulation around the impurity like
One reported on direct observation of the predicted density modulation of the stripe phase using Bragg reflection, establishing a system with the relevant symmetry breaking properties.
The analog signal to be amplified is converted to a series of pulses by pulse width modulation, pulse density modulation or other method before being applied to the amplifier.
In more recent times, the Direct Stream Digital sound encoding method was introduced, which uses a generalized form of pulse-width modulation called pulse density modulation, at a high enough sampling rate ( typically in the order of MHz ) to cover the whole SACD format, and reproduction of the encoded audio signal is essentially similar to the method used in class-D amplifiers.