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The "noise" becomes "content" through the use of standardized language designed for clarity under pressure:
SNR = Signal-to-Noise Ratio
"All units, we have a 211—Armed Robbery in progress—at the Quick-Mart on corner of Maple and 5th. Suspect is male, white, wearing a grey hoodie. Last seen heading North on foot. Unit 4, can you cover?"
Unwanted sound emanating from a police radio’s speaker, including:
