chimera wrote on Oct 8
th, 2023 at 10:56am:
Dnarever wrote on Oct 7
th, 2023 at 11:36pm:
They got upset with me in the end and started swearing at me for wasting their time.

Way to go! I have a plastic whistle and wait until the caller is ready for my reply. Big breath..go...
Cool.
Unfortunately,
that's just a waste of time and effort. Quote:I was just listening to a radio discussion about dealing with scam phone calls. A lady phoned in and said that she blows a loud whistle when she gets one and the presenter got her to demonstrate. What we heard was a loud(ish) hissing noise. She insisted that it was not a dog whistle but more like the ones used by referees.
The question is - does the scammer hear the same muffled squeak, or are their eardrums assaulted by a shrill noise? It should be easy to test if you have a friend with a suitable whistle.
Quote:My understanding is that the audio quality of phone sounds is (still!) so degraded that the scammer won’t hear anything close to what the whistleblower will hear.
Quote:Well, it’s “degraded” on purpose. Telephones were originally designed for voice transmission. The frequencies present in the human voice range from 30 Hz to 3400 Hz. In order to save bandwidth, and therefore pass more total phone calls on any given transmission medium, higher frequencies are filtered out. Plus, the volume is limited on the far end - so a 110 dB sound on the speaker side will probably get limited down to 70 dB on the listeners side. So yes, a whistle won’t be nearly as annoying to the listener as it is to the speaker.
Quote:My Uncle worked for SW Bell, and I was surprised when he told me the bandwidth of a phone call. Something like 5kHz. I imagine a whistle or fog horn would just be mild noise.