# PhysWave Mono-Label FOA Release

This directory contains pre-rendered first-order ambisonic (FOA) audio derived
from Mono-Label-120k mono clips. Each source mono clip is rendered twice:

- one static trajectory
- one deterministic moving trajectory (`linear`, `circular`, or `approach_recede`)

Audio files are 10 second, 16 kHz, 4-channel PCM16 WAV.

FOA convention:

```text
channel order: W, X, Y, Z
W = s / sqrt(2)
X = s * cos(elevation) * cos(azimuth)
Y = s * cos(elevation) * sin(azimuth)
Z = s * sin(elevation)
distance gain = 1 / max(distance_m, 0.5)
moving trajectories use retarded-time propagation at 343 m/s
```

Angles are in degrees. Distances are in meters. Metadata stores 10 Hz
waypoints, so a normal 10 second render has 101 waypoints:
`[t_seconds, azimuth_deg, elevation_deg, distance_m]`.

Summary:

```json
{
  "source_records": 127269,
  "rendered_rows": 254538,
  "static_rows": 127269,
  "moving_rows": 127269,
  "missing_source_records": 0,
  "moving_type_counts": {
    "approach_recede": 42464,
    "linear": 42645,
    "circular": 42160
  },
  "split_counts": {
    "test": 6436,
    "train": 248102
  },
  "audio_format": "PCM16 WAV",
  "sample_rate": 16000,
  "channels": 4,
  "waypoint_rate_hz": 10,
  "waypoints_per_10s_clip": 101,
  "renderer_version": "physwave_foa_release_v1_pcm16",
  "metadata_path": "/media/volume/Spatial_audio_dataset_upload/metadata.jsonl",
  "metadata_shards_dir": "/media/volume/Spatial_audio_dataset_upload/metadata_shards"
}
```