81–90 of 119 posts
This predates me by at least a decade. How do you use the “BBS”? So once you dial in, it uses IVR to read and write messages? Sounds painful to me once you have more than a dozen active users
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I thought VoIP codecs all chopped the frequencies that seems like it would be very detrimental to a data signal. Is the "HD" quality high enough for that, or was the analog data signal not as full frequency as I'm thinking they would be?
Most internet-based VoIP services (read: full telephone providers, not just chat providers) use the same exact G.711 codecs used in the digital portions of traditional telephone lines for normal calls. In theory you can run anything over this that could run over a long distance PSTN link. In practice most modem technologies do not handle jitter and packet loss well at all, and quirks which a human would not even noti…
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Lots of fun history around 2600Hz for those too young to remember or not part of the phreaking crowd, a fairly extinct form of hacker these days. A phreaker going by Joybubbles was the first to exploit the tone by whistling. Later, a toy whistle in a cereal box was found to be able to produce the tone, leading to further exploit by John Draper, aka, Cap'n Crunch. You can 3D print the whistle these days for a bit of n…
Shameless plug for my book on the history of the subject, for those interested: https://explodingthephone.com/
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Most internet-based VoIP services (read: full telephone providers, not just chat providers) use the same exact G.711 codecs used in the digital portions of traditional telephone lines for normal calls. In theory you can run anything over this that could run over a long distance PSTN link. In practice most modem technologies do not handle jitter and packet loss well at all, and quirks which a human would not even noti…
You want 722 really, one of the choices for "HD voice", it mangles it much less than even 711
G.722 might sound better to humans, but G.711 is definitely better for modems since it’s effectively just uncompressed PCM (disregarding a bit of dynamic range compression which modems are generally fine with).
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You want 722 really, one of the choices for "HD voice", it mangles it much less than even 711
No, unlike G.711, G.722 is lossily compressed using psychoacoustic concepts, and modems wouldn’t know what to do with the extra acoustic frequencies anyway. G.722 might sound better to humans, but G.711 is definitely better for modems since it’s effectively just uncompressed PCM (disregarding a bit of dynamic range compression which modems are generally fine with).
It would be possible to mask this with a relatively simple FXS device to hide all of this and pretend it's a modem while packetising the actual data, but I guess the demand is almost zero so why bother.
I've been looking for a solution for many years to retain dialin services without having racks full of modems and trunks that are rapidly going out of fashion and at some point will not be available except via IP (and now we have the same problem at both ends), but they just don't exist.
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Shameless plug for my book on the history of the subject, for those interested: https://explodingthephone.com/
Just a heads up, the Amazon link from your site lands on the hardcopy version which there are only used copies of.
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Shameless plug for my book on the history of the subject, for those interested: https://explodingthephone.com/
Hey, I notice you sell via a variety of sources. Which one ensures you the most ROI? I've always been curious, and like supporting others, but I worry that there's so many hands between you and your customer that by the time it the money reaches you, there is not much left.
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Shameless plug for my book on the history of the subject, for those interested: https://explodingthephone.com/
Not surprised at all to see the author on here. Your book is marvelous. I demolished your book on a flight a few years back, thoroughly enjoyed it, and was sad that it was all over so quickly (both the book, and the phreaking era). It has a permanent home on my shelf next to "The Cuckoo's Egg" as one of my favourite old tech storybooks and I recommend it to anyone vaguely interested in the subject.
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Shameless plug for my book on the history of the subject, for those interested: https://explodingthephone.com/
I was going to suggest this book as well, but no need if you're here doing it. Just a quick thanks for the book! I've read it multiple times whenever I feel nostalgic, and recommend when the subject comes up. I've even gifted a few copies.