Module 1: Foundations

Compressed Codecs — G.729, G.722, and Why Compression Matters

Learn about compressed codecs — g.729, g.722, and why compression matters

Duration: 7 minutes
Level: Beginner
Lesson: 9

The Quality-Bandwidth-Latency Triangle

Every voice codec makes a tradeoff between three competing priorities:

  • Quality: How close to the original speech does the decoded audio sound?
  • Bandwidth: How many bits per second does it consume?
  • Latency: How much delay does the encoding/decoding process add?

G.711 maximizes quality and minimizes latency, but uses the most bandwidth. Compressed codecs sacrifice some quality and add latency to dramatically reduce bandwidth. Understanding these tradeoffs is essential for making informed decisions about codec selection and for diagnosing quality issues rooted in codec choice.

G.729 — The Workhorse Compressed Codec

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