Notification Sound MeasurementsMeasured levels and spectral characteristics of current OS and app event sounds
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Microsoft Teams · Message

b4_teams_urgent_notification_r4_alarm

c5c76a0926a6

Level measurements

Integrated-11.6 LUFS
Maximum momentary-8.5 LUFS
True peak-2.4 dBTP
RMS-17.2 dBFS
Active RMS-16.8 dBFS
Duration2.625 s
Maximum short-term—
Loudness range—
Sample peak-2.4 dBFS
Sample crest factor14.7 dB
True-peak crest factor14.8 dB
Active duration2.390 s

Level over time

RMS · 10.0 ms · 263 points

Active threshold -50.9 dBFS
Short-window RMS level over time Each point is the channel-combined RMS of a non-overlapping frame. Values below −80 dBFS are pinned to the chart floor for display; the canonical JSON retains measured values, and digital silence remains null. 0 -20 -40 -60 -80 0.00 0.66 1.31 1.97 2.63 RMS (dBFS) Time (seconds)

Each point is the channel-combined RMS of a non-overlapping frame. Values below −80 dBFS are pinned to the chart floor for display; the canonical JSON retains measured values, and digital silence remains null.

Frequency characteristics

Spectral centroid2810 Hz
Peak frequency3068 Hz
200 Hz–8 kHz energy93.9 %
Third-octave band energy Frequency is shown on the horizontal axis and band energy on the vertical axis. Values below −120 dBFS are pinned to the chart floor for display. 0 -20 -40 -60 -80 -100 -120 31.5 63 125 250 500 1k 2k 4k 8k 16k 25.0 Hz: -100.6 dBFS 31.5 Hz: -99.8 dBFS 40.0 Hz: -97.7 dBFS 50.0 Hz: -96.8 dBFS 63.0 Hz: -95.2 dBFS 80.0 Hz: -96.6 dBFS 100.0 Hz: -96.8 dBFS 125.0 Hz: -93.9 dBFS 160.0 Hz: -88.7 dBFS 200.0 Hz: -76.6 dBFS 250.0 Hz: -51.6 dBFS 315.0 Hz: -39.6 dBFS 400.0 Hz: -35.0 dBFS 500.0 Hz: -31.5 dBFS 630.0 Hz: -36.3 dBFS 800.0 Hz: -26.5 dBFS 1000.0 Hz: -40.0 dBFS 1250.0 Hz: -36.5 dBFS 1600.0 Hz: -22.6 dBFS 2000.0 Hz: -39.2 dBFS 2500.0 Hz: -30.6 dBFS 3150.0 Hz: -22.6 dBFS 4000.0 Hz: -33.5 dBFS 5000.0 Hz: -28.2 dBFS 6300.0 Hz: -38.5 dBFS 8000.0 Hz: -33.4 dBFS 10000.0 Hz: -31.0 dBFS 12500.0 Hz: -41.0 dBFS 16000.0 Hz: -40.1 dBFS Band energy (dBFS) Frequency (Hz)

Frequency is shown on the horizontal axis and band energy on the vertical axis. Values below −120 dBFS are pinned to the chart floor for display.

Current source occurrences

Microsoft Teams v26198.202.4929.7171

Message

Contents/Resources/b4_teams_urgent_notification_r4_alarm.wav
Acquisition
official_distribution
Source observed
2026-08-09T06:29:46Z
Distribution package
URL ↗
Package SHA-256
dd5fab62b2003993a49ac86ecdc653500e970e29efd8c8b100f17d0adb30987e
Official source ↗

Technical metadata

SHA-256c5c76a0926a6eaea33ad14a48ce94c3d3d41781481a0fb1ae190949500dc36bc
Analyzed2026-08-09T06:29:46Z
CodecAAC (Advanced Audio Coding)
Sample formatfltp
Sample rate44100 Hz
Channels2 · stereo
Analysis profilenotification-sound-db-bs1770-v2
FFmpegffmpeg version 8.1.2 Copyright (c) 2000-2026 the FFmpeg developers

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