Why does each number on the telephone has a different sound to it?

9.2 speaker system image

Im no ones

dial 1234567890, press talk and put it on speaker, hang up before anyone pick up. A different sound for each number, why is that?

Does it have to do anything with wavelengths?

And how am i able to call places? Through satellites? Details please

Thank ya!

Answer
Many decades ago when a person wanted to place a phone call they would pick up the phone and the operator at a "switchboard" would be on the other end of the line. (In small towns the switchboard operators usually knew the people placing calls by first name.)

Tell the operator who you want to call and they would plug patch cords that had the big 1/4" plug on the end, like headphones, and plug your phone connection into the phone connection for the person you want to call and than the operator would ring the other persons phone.

In a big city the operators were quite busy putting phone calls through. Hundreds or possibly thousands of people picking up phone receivers throughout the day and night wanting to call someone. They give the operator the number they wanted and the operator would move the patch cords so the call could go through.

But than eventually the whole phone system became computerized so it would work more efficiently. The different tone that you hear for each number tells the computer "switchboard" what number you are pushing so it moves the "switch" or phone circuit to that number, and than the next one dialed and the next and so on.

So to start off with a United States area code a first number could be 3 the computer registers that and than is waiting for the next number to be input. Imagine your phone keypad, you push 3 and in the computer system the next available numbers might be 2, 7, 1, 8, 9 so imagine the other numbers on the key pad disappearing because they don't belong to any active number. So than you push 2 and than 9,2,7,0 are possible numbers that can be dialed after that. So than you dial 7. So in the moment that it takes you to dial the area code 327 the computer system is doing all the switching and patching in nanoseconds. The most effective way to explain it would be to draw a number tree where you have 3 as the base and than 2, 7, 1, 8, 9 on seperate branches off the 3. Than the other numbers available after dialing the 2 would be branched off of it as possible numbers that can be dialed.

Here are two links with pictures to show you what old phone systems used to look like. Even today with all of our technology the phone system still works the same way. But all of the "switchboard" work that happens is controlled with computer software and is within computer systems.

Switchboard operator
http://en.wikipedia.org/wiki/Switchboard_operator

Telephone Switchboard
http://en.wikipedia.org/wiki/Telephone_switchboard

Even with cell phones they have to go through the same switch relays for a call to be made. But now it's even more advanced with it having to go through satellites and cell phone towers. When making a call from a cell phone to a landline that is a major feat of technology happening right there. Because as you dial the cell phone it goes through all the switch relays, goes through the cell phone tower, to a satellite, the satellite sends it to phone company computers where your call is sent through the landline system and than it rings at the persons house on the other end.

I also worked as a Traffic Flagger, directing road traffic through workzones. I have worked with many utility companies including power, phone and cable and have got to see some of the wiring and work that it takes to make all of our technology work. A buddy of mine works for a contractor of AT&T and helps repair and do upgrades to their systems near Seattle, WA. He's told me about the millions upon millions of dollars of system upgrades AT&T had to do just so people could use their new iphones and other smartphones on the internet send and receive MMS and many other things people take for granted with cell phones and don't know all the labor that makes it work.

If you watch some old shows and movies from the 1930's, 40's and 50's they occasionally have a character making a call and having to talk with the operator. One TV show in particular that I remember that showed the operator and the some of the steps to making a call was The Andy Griffith Show. They didn't show it all the time, but occasionally they would.

I don't have highspeed so I rarely use Youtube because it take FOREVER for even simple video's to load. But fortunately they show a preview picture for the search results. I have included some Youtube links of videos showing how the original switchboards worked. If you want to see a long list of more clips to watch search "Telephone Switchboard Operator" on Youtube.

http://www.youtube.com/watch?v=njW70pofZsg

http://www.youtube.com/watch?v=bx-mmJDG4LE

http://www.youtube.com/watch?v=tnupsncpTng

http://www.youtube.com/watch?v=Et-Yr35d2so

http://www.youtube.com/watch?v=-uuNf3_FZH0

What's the best receiver for home theater?

Willie O

I have 3 Triad Inroom Bronze LCR that I use for front speakers and center speaker & 1 Triad Bronze bass speaker. I also have 2 wall mounted Paramax. I would like to know what is the best receiver to use for the best quality sound?

Answer
- Onkyo or Pioneer or Denon or Yamaha.

Some examples of different levels.

- Good low end receivers will cost around $300-$900 (crappy receivers or stereo receivers might cost less than $200 and that's when it's not on sale) and high end receivers will cost more than $1,000.
= I recommend a new low end 7.1/7.2 system, but you have to find one on sale yourself tho. (If your on a budget then just get a low end 5.1/5.2 receiver, a high end 5.1/5.2 receiver is not worth the extra money and you would be better off getting a low end 7.1/7.2 receiver, high end 7.1/7.2 or 9.1/9.2. or 11.1/11.2 .ect receiver is only ok if your rich or if it's on a massive sale).

Some good 5.1 or 5.2 channel audio/video receivers. (Overall=low end).
- Low end = Onkyo TX-SR313 or HT-RC430; Pioneer VSX-523-K; Yamaha RX-V375; Denon AVR-1312 or AVR-1513 or AVR-E200 or AVR-E300.
- High end = Onkyo TX-NR414; Pioneer VSX-823-K; Yamaha RX-V475; Denon AVR-1613 or Denon AVR-1713.

Some good 7.1 or 7.2 channel audio/video receivers. (Overall=high end).
- Low end = Onkyo HT-RC460 or TX-NR525 or TX-NR626 or TX-NR727; Pioneer VSX-1023-K or VSX-1123-K or VSX-43/73; Denon AVR-1913 or AVR-E400 or AVR-2113CI; Yamaha RX-V575 or RX-V675 or RX-V775WA.
- High end = Onkyo TX-NR818 or TX-NR1010 or TX-NR3010 or TX-NR5010; Pionerr Elite series SC-61 to 68; Denon AVR-2313CI or AVR-3313CI or AVR-4520CI.

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