What type of frequency processing is performed by both doublers and triplers?

The correct answer is frequency multiplication. Doublers and triplers are devices that specifically enhance a signal by multiplying its frequency, which means they take an input frequency and produce an output frequency that is a multiple of the original input frequency. For example, a frequency doubler takes an input signal and generates a signal at twice the frequency, while a frequency tripler produces a signal at three times the frequency of the input.

This process is fundamental in applications such as signal generation and communication, where specific frequency outputs are required. Frequency multiplication is crucial for creating higher harmonics from lower frequency sources, enabling more effective transmission and reception of signals in various technologies.