It’s a tight fit, but it does fit. The Rumbler isn’t just a white noise generator. White noise has a flat spectrum, but the noise from the Rumbler is closer to Red or Brownian Noise.
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When Apple introduced the feature, there were six ambient sounds you could play on a loop: rain, stream, ocean, and bright, balanced and dark noise, which are different pitches of white noise.
A configurable AWGN generator that can be used as emulator of a noisy transmission channel and can support very high throughput rates up to 10 Gbps.