[ECE] 1.1Digital and analog quantities

Q: What is the distinction between analog and digital quantities?

A: Analog quantities involve continuous values, as exemplified by vinyl records of 12 inches (~30cm) lasting for 3.5 hours. In contrast, digital quantities comprise a discrete set of values, as seen in Compact Discs (CDs) of 12cm, with a capacity of 74 minutes.

Q: What advantage does digital data offer over analog data?

A: Digital data can be stored, processed, and transmitted more efficiently and reliably than analog data. It is also more resilient to noise.

Q: Are there any drawbacks to digital systems?

A: Yes, digital systems have disadvantages. One notable drawback is that digital systems can introduce quantization errors, leading to a loss of precision in representing continuous analog signals.

Q: How is digital data converted back to an analog signal for amplification?

A: A Digital-to-Analog (D/A) converter is used to convert digital data into an analog signal, facilitating amplification for devices such as speakers or headphones. (A mixed system)