# DaCAS Permanent Document: Target Devices and Databases v0.5 — Summary

## Overview
This is a living/permanent document tracking progress of the **DaCAS (Data Collection for Audio Capture Solutions)** work item under SA4. It defines target UE device types, recording scenarios, and databases to support development and evaluation of immersive audio capture solutions for **IVAS** encoder input formats.

## Target Device Categories
- **Category 1 (Prototypes):** Device A (idealized accessory, free-field approximation) and Device B (practical smartphone with non-planar mic array) — for algorithm development and theoretical validation
- **Category 2 (Commercial smartphones):** Mainstream smartphone configurations reflecting market-available devices for legacy deployment scenarios
- Additional devices include 3-mic smartphone, 4-mic smartphone variants (×2), and 3-mic XR HMD

## Recording Scenario Framework
Three scenario types defined:
1. **Device characterization** — electro-acoustic properties (frequency response, etc.)
2. **Development recordings** — algorithm development for raw/compensated mic signal processing into IVAS encoder input formats
3. **Evaluation recordings** — subjective and objective evaluation; objective evaluation aligned with TS 26.260

## Minimum Mandatory Recordings (per device)
- **Required:** Recording scenarios 1, 2, 3, [9 and 10]; at least 2 real immersive usage scenario recordings (from scenarios 5–8)
- **Recommended:** At least 4 immersive usage recordings; all defined scenarios if possible
- Editor's note open: whether scenario 3 recordings can substitute scenarios 9/10

## Database Requirements
- Raw microphone signals must be recorded (no pre-processing/NR)
- Minimal acoustic footprint from mounting hardware
- Channel ordering, DUT orientation, turntable direction, and source signals must be documented
- Separate databases provided for each device type (links included for Nokia 4-mic prototype, 3-mic smartphone, 4-mic smartphone ×2, XR HMD — several are simulation-based)

## Key Affected Specs / References
- **TS 26.533** (DaCAS technical spec, v0.1.0) — device type definitions referenced from §4.2
- **TS 26.260** — referenced for objective evaluation alignment
- Three interlinked database templates: Target Device DB, Recording Scenarios DB, Recordings DB

## Status
Work in progress; several editor's notes remain open (coordinate system optimization, scenario 9/10 construction from scenario 3 recordings, per-solution device targeting flexibility).