# STT: Google Speech-to-Text v2 / Chirp Evaluation (follow-up)

Status: planned (not implemented). Related: gateway `connectorVoiceGoogle.py` uses Speech v1 `SpeechClient` only.

## Goal

Benchmark STT v2 (e.g. Chirp / Chirp 2) for `de-DE` vs current v1 `latest_short` / `latest_long` on:

- Latency (time-to-first-token, final latency)
- WER / subjective quality in meeting + coaching scenarios
- Cost and quota

## Steps

1. Add optional v2 client path (`google.cloud.speech_v2` or REST) behind a feature flag.
2. Run A/B on CommCoach streaming and Teamsbot batch paths with identical audio fixtures.
3. Document decision in `wiki/b-reference/` and remove flag or make v2 default.

## Notes

- Streaming and batch config differ between v1 and v2; keep `VoiceObjects` as the single facade.
- Billing hooks (`calculateSttCostCHF`) must use measured duration (see streaming `result_end_time`), not compressed byte heuristics.