Knock

: Developing a "piece" or system for knock detection often involves using Short-Time Fourier Transform (STFT) to distinguish between engine knock and standard mechanical noise.

If you are building a product and need to develop a notification system, provides an infrastructure to power all messaging needs, such as transactional emails, in-app notifications, and lifecycle marketing. : Developing a "piece" or system for knock

In engineering, "knock" refers to abnormal combustion or vibrations that can damage engines. such as transactional emails