AVE / AS–01 · Acoustic reference method
Terrestrial sources and headphone presentation
These comparative studies retain their Earth source identities. They help the acoustic team examine material texture and listening presentation. They are catalogued separately from Avenra field records and carry no biological identification.
Source intervals
- Terrain airflow: “Wind Soundscape from Gem Lake,” Jacob Job / NPS, Rocky Mountain National Park. Source interval 20.00–30.00 seconds, placed at 18.50–28.50 seconds in the composite. The isolated file preserves composite interval 17.50–29.50 seconds, including quiet margins.
- Near contact: “Glacier ice on the beach,” H. Lentfer / NPS, Glacier Bay National Park & Preserve. Source interval 23.03–23.68 seconds, placed at 40.70–41.35 seconds in the composite. The isolated file preserves composite interval 40.40–41.70 seconds.
Processing and file preservation
The MP3 source recordings were decoded to 44.1 kHz, averaged to mono and centred. Editorial rumble filtering used 45 Hz and 220 Hz corner parameters for the airflow and contact textures respectively. Smooth entry and exit envelopes were applied before fixed-position stereo convolution. The gust and contact renders were scaled to sample peaks of −27 and −33 dBFS respectively. No reverb, repeated source loop or continuous ambient bed was added.
The two isolated files are exact 24-bit PCM slices of the stereo composite. Their extraction adds no gain, filtering, time stretch, fade or spatial change. All three hosted WAVs are copied byte for byte from these study outputs. A 24-bit container preserves the processing output; it cannot restore detail discarded by the original MP3 encoding.
Listening geometry
The head-fixed headphone render uses the nearest available diffuse-field KEMAR response pair. Airflow uses an assigned 305° azimuth, +20° elevation preset. Contact uses an assigned 75° azimuth, −40° elevation request, rendered at the available 77° / −40° pair. Azimuth is head-relative: 0° front, 90° right, 180° behind, 270° left.
These are rendering choices, not measured probe bearings. Generic mannequin responses do not establish a listener’s perceived direction, source distance or a spatially resolved wind field. There is no head tracking.
Signal display
The optional display reads existing analysis of the composite’s PCM. It shows minimum/maximum stereo envelopes and digital RMS bands from trailing 93 ms windows at 10 ms steps. The current window ends no later than playback time. Empty FFT bands remain empty. Digital dBFS is not source sound pressure, weather or biological event frequency.
Credits and source access
NPS source recordings are identified as public domain by their provider. MIT KEMAR data are used with author attribution: Bill Gardner and Keith Martin, HRTF Measurements of a KEMAR Dummy-Head Microphone, MIT Media Laboratory, 1994.
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AVE / VR–01 · Visual reference method
Illuminated terrain reconstruction
The terrain reconstruction is retained at 1672 × 941 pixels. Near-field illumination is active. The image supports examination of surface relationships; biological identifications remain attached to the individual observation records.
Passive starlight, active visible illumination, near-infrared and thermal observation are different acquisition modes. This reconstruction represents illuminated visible-light viewing. Exposure, calibration and sky observations are documented separately.
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