In signal processing, what is typically the effect of high impedance?

High impedance in signal processing typically leads to reduced signal fidelity. This occurs because high impedance systems can be more prone to noise and interference, which can distort the signal being processed. In practical terms, when the impedance is high, the input of a measurement device may not be able to draw sufficient current from the source, leading to a weaker and potentially less accurate representation of the original signal.

Additionally, high impedance can result in a higher output voltage when measuring, which might seem beneficial. However, this situation could also lead to a significant drop in current, making the circuit more susceptible to picking up noise from the environment, thereby compromising the integrity of the signal.

In contrast, improved electrical conductivity and increased electrical current are typically associated with low impedance rather than high impedance. Enhanced electrode contact is also generally a factor of proper placement and contact quality, rather than being directly related to high impedance.