# audio-fec-resilience Specification

## Purpose
Define bounded Apollo audio FEC state advancement and recovery after sustained incomplete blocks.
## Requirements
### Requirement: Bounded audio FEC state advances after loss
The Apollo audio recovery window SHALL remain bounded and SHALL evict the oldest incomplete block when accepting a newer block would otherwise be rejected.

#### Scenario: Newer complete block follows sustained loss
- **WHEN** more than the bounded number of permanently incomplete audio blocks arrive before a complete newer block
- **THEN** the oldest stale state is dropped, drop telemetry advances, and the newer encoded payload is relayed unchanged