Two handsets connected with EVS/VoLTE-HD sound superior to two analog phones on the same circuit, talking to each other.
If I call my parents' iPhone using my iPhone the call connects using a high-bitrate EVS codec, crystal clear.
I never do that, of course.
I FaceTime them.
[1] μ-law was used in North America and Japan, but a similar encoding called A-law was used elsewhere
Direct at the speed of light (almost)!
East Coast of the US to London, UK, in the early 1980s. Over three thousand miles. Quite expensive. Quality was dreadful.
He's being hyperbolic of course, since there's people in their 90s and 100s who made phone calls way back when you had to talk to the operator to place a long-distance call. But the general point is valid: how many people here actually remember the days when the connection was all-analog? You would have had to be making LD calls in the 1970s probably.
TAT-7 - 4000 analog 3 kHz channels over coaxial, laid 1983
TAT-8 - 280 Mbit/s over fibre optic, laid 1988
No.
Analog copper signals are TERRIBLE. A big reason telecom was one of the first to embrace digital transmissions was due to all the quality issues of copper.
Yes, latency was low, but that was about the only thing going for it.
To get a clear signal over copper you NEED a very large amount of insulation, and that insulation needs to be through the entire circuit. Just one section with frayed plastic, ran too close to a powerline, or is passing under a thunderstorm would introduce all sorts of noise onto the line. The longer the distance, the bigger a problem this was.
Sure, some calls might have been clear, but a lot were utterly terrible.
Of course, this only applied until I tried to make an overseas call - then it sounded like I was calling Mars.
If you go watch an old TV show with a long distance phone call (Comes up on MASH, for example, and the Twilight zone). You'll see people screaming into the phones. That was a pretty normal way to be heard as whispers simply couldn't be heard. Sending out a really strong vocal signal made it easier to hear that over the noise and pops.
As an example, one game phone phreaks in the 70s would play is stacking very long lines back and forth. Route a call across the country, then back, then back again. You could do NY - SF four or five times with a circuit length of like 10,000 miles sometimes before the channel was unusable.
You are otherwise totally right about the potential distortion of a long distance analog circuit. Other times filters would be out of tune and you would hear the hundreds of other analog channels just murmuring in the background not quite discernible, and calling the next town over was almost impossible.
Screaming into the phone was more the pre-electronics era with carbon microphones. The original analog phone systems had no active amplification at all. Voice powered microphones were typical in the military until quite late - I think they still use them as backups on ships.
If someone from Germany can chime in, I believe they had higher-bandwidth ISDN services in the late 1990s onwards.
You could go to E1/PRI to get 2048kbps for €€€€.
In North America ISDN was 56k due to the slower T1 it was sent in and framing.
With Apple users FaceTime audio has far higher audio quality than a "typical" phone call
Wondering what accounts for the difference. I assumed, if anything, audio compression would be more "aggressive" on web-service based calling than "traditional" calling.
LTE and 5G has the option of higher quality voice codecs (EVS) than older cellular networks when using VoLTE or VoNR. They support wider band sampling and higher data rates for better quality audio. Why most voice calls sound bad is inter-carrier compatibility still sucks. Typically calls will downgrade to AMR-WB or AMR-NB (8KHz and 4kHz sampling respectively).
FaceTime calls, or any other pure IP voice services, don't need to downgrade codecs to interoperate. They might have to change encoded bitrates based on network conditions but never go with some lowest common denominator codec because another user is on a different network.
Where can I learn about these topics?
People call for leisure of course, but the phone's part of that leisure activity is still just to convey information not art. The kids all switched completely to txt for the same non-utilitarian conversations once it became available.
For all it's low fidelity, it was actually quite high fidelity, in that it was actually very good at conveying all the "voice body language" information besides merely the words. It was just highly optimized for one job and that job was not music.
an example would be i game on my computer and for years i had a 60Hz monitor and it wasnt til 2020 i upgraded to 144Hz monitor. it is night and day difference in feel that i can never go back to a monitor under 120Hz
As a student I had none of those things.
In the end I concocted a successful scheme where I would buy a series of phone extension cables, convince my university bar to allow me use their landline for a while, book a drum practice room and wire the cables in a long chain carefully to it, using duct tape to keep the cables safe and above door frames etc.
Then I had to join the call, and when it was sight reading time run to the library to print out the sheet music, run back down and play it down the phone.
It was intense, but I got the gig and flew off and sailed around the Baltic gigging for a few months in the orchestra/show band which was awesome.
I really wish that a mobile phone would have worked, it would have saved me a huge amount of stress.
I suppose that's to be expected moving to wireless tech, but local analogue landline calls used to be so fast that they had lower latency than a conversation across a room. I know we've gained a lot and I wouldn't trade VOIP for going back to only mobile, or giving up both to going back to landline, but it is a shame quality isn't higher.
It is unfortunate how today phone calls are often heavily compressed. Back in the 80s, 90s, 00s the digital phone network would stream uncompressed PCM audio at 64 kbps and the rest was analog; calls often sounded better back then than they do today. Once we accepted the heavy compression necessary to make early digital mobile phone networks work at 10 kbps or so, we never got the quality back, even though devices have a thousand times more bandwidth available now.