Bit depth determines the resolution of each audio sample — how precisely the amplitude of the sound wave is captured. More bits means more possible amplitude values, which translates to greater dynamic range and lower noise floor.
Common bit depths:
- 16-bit — 96 dB dynamic range (CD standard)
- 24-bit — 144 dB dynamic range (professional recording)
- 32-bit float — virtually unlimited dynamic range (internal processing)
Rule of thumb: Each bit adds ~6 dB of dynamic range.
In game audio: Source assets are typically 16-bit or 24-bit. Internal processing uses 32-bit float. The final output depends on the platform — most use 16-bit. When reducing bit depth for final delivery, apply dithering to preserve quality.