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Signal processors are electronic devices or software that manipulate electrical signals to modify, analyze, or enhance them in various ways. They are used in audio, video, telecommunications, and other industries to adjust parameters such as amplitude, frequency, phase, or time. Signal processors can include components like filters, amplifiers, mixers, and modulators, and are essential tools for tasks like noise reduction, equalization, compression, and modulation. These devices play a critical role in shaping and refining signals for transmission, recording, and playback in a wide range of applications.