Can pure signal processing method be patented?

First of all, signal processing is the process of converting analog signals into digital signals, and then using efficient digital signal processing or computer to process them. With the rapid development of digital computers, the steps of digital signal processing are gradually mature and inherent, namely:

(1) Analog-to-digital conversion (A/D conversion): Converting analog signals into digital signals is a process of discretizing independent variables and amplitudes at the same time, and the basic theoretical guarantee is sampling theorem.

(2) Digital signal processing (DSP): including transform domain analysis (such as frequency domain transformation), digital filtering, identification and synthesis.

(3) Digital-to-analog conversion (D/A conversion): The processed digital signal is restored to an analog signal. Usually, this step is unnecessary.

These methods or devices for signal processing already exist, so you can't apply for a patent for pure signal processing method, because its technical points already exist, which doesn't conform to the novelty and creativity of invention and creation, so you can't get a patent.

I hope it helps you ~