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Flip decision 12: the tablet owns aux, not the Orin

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The earlier decision assumed the Orin would be the media source. It is not —
the tablet is the music player and that role is staying put, so it holds the
aux cable regardless. Giving the Orin its own aux line would have added a
second permanent cable rather than freeing the display unit.

TTS therefore crosses the boundary as discrete utterances over the reliable
channel rather than a real-time stream, and ducking moves to Android audio
focus, which handles cross-application ducking natively.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_013kj58Jugkic783b8ZrtTVZ
This commit is contained in:
Mikkeli Matlock
2026-09-04 13:57:40 +09:00
parent fa49976efd
commit 1d24d90c36
2 changed files with 45 additions and 17 deletions
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docs/ARCHITECTURE.md
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@@ -279,7 +279,7 @@ rewriting the document.
| 9 | Nav guidance published on the bus; route requests over HTTP via `telemetry-gw` | **Proposed** | 2026-09-03 |
| 10 | Map artifacts delivered by `rsync` over LAN only; Valhalla tiles kept as a directory, not a tar | Accepted | 2026-09-03 |
| 11 | Boot ordering is capture-first: acquisition reaches ready before serving or voice | Accepted | 2026-09-03 |
| 12 | The Orin owns the car's aux input; the display unit carries no permanent cable | Accepted | 2026-09-03 |
| 12 | The **tablet** owns the car's aux input; TTS crosses as discrete utterances, not a stream | Accepted | 2026-09-04 |
| 13 | Reasoning stays in the cloud — a local LLM does not fit beside the voice stack | Accepted | 2026-09-03 |
| 14 | Recordings are bounded with rotation | Accepted | 2026-09-04 |
| 15 | Boundary is two simplex channels — lossy stream down, acknowledged request/response up | Accepted | 2026-09-03 |