A-D conversion, also known as analog-to-digital conversion, refers to the process of converting analog signals into digital signals. There are several synonyms for the term A-D conversion, including digitization, digitalization, quantization, and sampling. These synonyms refer to different aspects of the A-D conversion process. Digitization refers to the conversion of analog signals into digital format, while digitalization refers to the use of digital technology to process signals. Quantization refers to the process of assigning a numeric value to each sample of an analog signal, while sampling refers to the process of taking discrete samples of an analog signal at regular intervals. All of these terms are used interchangeably in the field of signal processing and digital communications.