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Defence Force Recruiting: The Audio Ad You Can See

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To find its new intelligence recruits, the Australian Navy released an audio ad with a print ad hidden inside it. The only way to reveal the hidden image was to process the audio with a spectrogram – the same technology Navy intelligence officers use to analyse frequencies and identify threats at sea. Not everyone found the hidden recruitment message. But those who did knew exactly where to apply for an intelligence role suited to their skills.

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