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    What frequencys are the four tones generated for testing audio when T.V. stations are off air but still broadcasting split field color bars or in the old days the test pattern/indian head?

    Question #56471. Asked by dejavucub4. (Apr 05 05 4:47 PM)


    MrsAce

    		I do remember the annoying tones. They are called sine wave codes. It's no longer known as the Emergency Broadcast System, it's now called The Emergency Alert System. You can hear it on the site below.

    http://www.artcontext.com/crit/scrapbook/2001/emergency_broadcast_system.html

    This has been a test of the Emergency Broadcast System. Had this been an actual emergency, you would have been alerted about where to turn for further information. This concludes this test of the Emergency Broadcast System.

    http://en.wikipedia.org/wiki/Sine_wave



    Apr 05 05, 5:24 PM
    dejavucub4

    		Times up 3,3.3,5 & 7 Mhz.

    Apr 07 05, 10:19 AM

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