Analog-to-Digital Conversion
Definition
Analog-to-Digital Conversion (ADC) is the process of converting a continuous analog signal into a discrete digital representation. This process involves sampling the analog signal at regular intervals and converting these samples into binary numbers that represent the signal’s amplitude.
Detailed Explanation
ADC is crucial in modern digital systems, enabling the processing of real-world analog signals in digital form. The conversion process involves three main steps:
- Sampling: Converting continuous-time signal to discrete-time signal
- Quantization: Converting continuous-amplitude samples to discrete values
- Encoding: Converting quantized values to binary code
Key Concepts:
- Sampling Rate: Must be at least twice the highest frequency component (Nyquist Rate)
- Resolution: Number of bits used to represent each sample
- Quantization Error: Difference between actual and digitized values
Applications:
- Digital audio recording
- Digital communications
- Digital signal processing
- Measurement and testing equipment