Update README.md

README.md

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-license: cc-by-nc-4.0
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+---
+license: cc-by-nc-4.0
+language:
+- en
+tags:
+- noise
+- Ambient Noise
+- Noise Collection
+- background noise
+---
+## Speech-Free Background Noise Dataset — Real-World, Non-Synthetic (360 Hours)
+
+# Dataset summary
+360 hours of real background noise without intelligible speech, from three scenes: airport, street, subway. The dataset is intended for speech enhancement via noise augmentation and sound event detection (SED) as “clean background”/negative class
+
+# Purpose and usage scenarios
+- Speech enhancement: adding noise to clean speech
+- Sound Event Detection: background samples without target events/speech; negative samples and false alarm rate estimation
+- Filtering/noise reduction: training noise reduction models without the risk of intelligible speech leakage
+
+# Noise Environments
+- airport: terminals, corridors, gates, baggage areas
+- street: sidewalks and roadways; traffic, wind, footsteps, street music as indistinct background noise
+- subway: platform, train car, passageways; braking/acceleration, tunnel rumble, doors, announcements as indistinct background noise
+
+# Features:
+- Only real recordings. No synthetic mixes, babble noise from summing up clear speech, etc
+- No intelligible speech. Only natural crowd noise where no single utterance is intelligible is allowed
+- Only noise. Music, dominant speech, and close-up announcements are excluded
+
+