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A comment on Show HN: I made a tool to communicate data using the PC speaker. Parent comment

Re:Show HN: I made a tool to communicate data using the PC s... by tdeck on Wednesday April 21, 2021 @06:27PM (#26896231)
Wow it sounds like RTTY (radioteletype):

https://m.youtube.com/watch?v=wzkAeopX7P0

I suppose there are only so many ways to modulate a data signal.

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Re:Show HN: I made a tool to communicate data using the PC s... by nereye on Wednesday April 21, 2021 @10:00PM (#26897869)
There are a few hundreds listed at https://www.sigidwiki.com/wiki/Signal_Identification_Guide.
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