In digital voice networks, what does error correction do?

• A. Error correction increases the raw data rate always.
• B. Error correction detects and corrects certain errors to improve intelligibility.
• C. Error correction degrades signal quality.
• D. Error correction is only relevant for analog modes.

Answer: (B)

Error correction in digital voice networks adds redundancy so the receiver can detect and fix some errors caused by noise and distortion. This recovery helps keep the spoken message understandable even when the channel isn’t perfect. That’s why the correct idea is that error correction detects and corrects certain errors to improve intelligibility—the goal is to preserve voice quality, not to make things worse. There are tradeoffs: the extra bits used for error correction reduce the raw data rate, and this concept applies to digital systems rather than analog modes. It’s not about degrading signal quality; it’s about preserving it by correcting mistakes that occur in transmission.