Search for: [Description = "This paper presents research on improving the intelligibility of spoken messages transmitted to aircraft from a ground station. The proposed solution is based on the selective calling \(SELCAL\) system and the audio watermarking technique. The most important elements of a spoken message \(commands, numerical values\) are transmitted as a watermark embedded in the speech signal and are displayed to the cockpit crew. The synchronization signal is embedded in SELCAL duo\-tones. The proposed system is resistant to resampling and channel noise \(at SNR > 25 dB\)."]

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