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GPO-52 - Dial Tone doesn't sound at all right #6

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andy-preston opened this issue Nov 14, 2023 · 1 comment
Open

GPO-52 - Dial Tone doesn't sound at all right #6

andy-preston opened this issue Nov 14, 2023 · 1 comment

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@andy-preston
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andy-preston commented Nov 14, 2023 •
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Now that Tones has been split up into Tones and ToneSamples - it should be possible to add a BuildSrc method that extracts the tones for easier analysis on the desktop.
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andy-preston commented Feb 22, 2024 •
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The UK dial tone combines 350 Hz and 450 Hz tones creating a 100 Hz beat frequency.

In the United Kingdom, the busy tone is a single 400Hz tone with equal 0.4 s (technically: 0.375 s) on/off periods. The current 400Hz/375ms tone was adopted in the mid to late 1960s and replaced the older busy tone, which was the same 400 Hz signal but at half the interruption rate (i.e. 0.75 s on, 0.75 s off).

https://www.youtube.com/watch?v=Rohu1aztJMo

@andy-preston andy-preston changed the title GPO-52 - Dial Tone doesn't sound quite right GPO-52 - Dial Tone doesn't sound at all right Jul 20, 2024
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