Having consulted a friend who has way better ears than mine, he was able to tell me that the two tones that make up the announcement tone are a minor third and almost certainly fourth octave b and fifth octave d. Armed with that information, I have generated something that sounds to my tin ears pretty close to the sound in the recording. I used a sine wave and generated each tone onto a separate track. Sample mp3 file attached. Note the brief fade out at the end to match the chime at the airport.
The frequencies for the two notes are 493.883 and 587.33. You could adjust them if you think they are not quite right.
On 7/10/2015 6:48 AM, Annabelle Susan Morison wrote:
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Hi, it's Annabelle.
I wonder, how would I generate the sound of an announcement bell, that is, the bell you'd hear on a PA system, like that of an airport or in a supermarket? Here's an example of what I want to generate. Listen carefully for the bell before the announcements.