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I made this as a near ultrasonic SMS signal.
Created and edited with Audacity, filtered with GLAME Bandpass filter.
If you hardly cut a pure tone, you introduce a whole lot of other frequencies to the signal at the cutting point. To avoid this after the cutting you need to filter the whole thing with a bandpass filter to ensure you have as little other frequency content as possible.
It will audibly soften the start and the end of the sound. That's what I did here.
Type
Flac (.flac)
Duration
0:00.172
File size
11.8 KB
Sample rate
48000.0 Hz
Bit depth
24 bit
Channels
Mono
7 years, 8 months ago
experimenting with this as a 'keep alert' alarm that's not too annoying