[audacity4blind] Re: Sound Generator - Announcement Bell

  • From: Andrew Downie <access_tech@xxxxxxxxxxxxxx>
  • To: audacity4blind@xxxxxxxxxxxxx
  • Date: Thu, 8 Oct 2015 19:14:39 +1100

Regarding amplitude, I accepted the default of 0.8. For reasons outside my understanding, that translates to a value of about minus 2 when checking the level on the track that is produced.

Regarding the short fade out, you need to select just the section of audio to which you want the fade to apply. That applies to any effect. For the announcement tone, I selected just the last half second or so and applied the fade.

Are you familiar with the selection toolbar? Pressing ctrl-f6 from the track view will take you to it. I won't describe further here but feel free to ask questions if you are not familiar with that really important facility. Another way of achieving the same result is to use left and right brackets to set left and right ends of selection while in track view.


On 8/10/2015 1:14 PM, Annabelle Susan Morison wrote:

What was the amplitude you put these on?

*From:* audacity4blind-bounce@xxxxxxxxxxxxx [mailto:audacity4blind-bounce@xxxxxxxxxxxxx] *On Behalf Of *Andrew Downie
*Sent:* Wednesday, October 07, 2015 12:52 AM
*To:* audacity4blind@xxxxxxxxxxxxx
*Subject:* [audacity4blind] Re: Sound Generator - Announcement Bell

Hi Annabelle

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.

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