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PHONE KEYPAD MUSIC!


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#1 Erik98225

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Posted 14 February 2005 - 10:04 PM

Your friends will get a kick out of this: A telephone keypad (at least in the US and Canada) can be used to play music.

Here's how you do it.

Important: Dial your own phone number (you'll get a busy signal) before proceeding, so the digits you're pressing won't call someone!

With that out of the way, we can start making music. The north american phone keypad is wired like this: Moving RIGHT gives you a much higher note, moving DOWN gives you a slightly higher note.

Put another way, 4, 5, and 6 are your main notes; 1 is "4 flat", 7 is "4 sharp" etc.

It's amazing how many songs you can play with only three notes.

Mary Had A Little Lamb: 3212333, 222, 399, 3212333222321
Happy Birthday: 112132, 112193, 11#9632, 223121

There are many others and I'm sure this information is on google somewhere.

Also, it will be horribly off key, but it is actually possible to play the US national anthem on a phone keypad. Here are the digits:

741706, #6214*, **#960, 5500741.
741706, #6214*, **#960, 5500741.
6669##, ##6699, 9022*, 447147.
100054446#96332, 118369#, 883#87.

I made an mp3 of this... it is off key but definitely recognizable as the Star Spangled Banner. I will make the mp3 available for download once my darn web hosting company gets its act together (their "1 hour" server upgrade has taken 2 days...)

#2 Erik98225

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Posted 15 February 2005 - 01:21 AM

The phone keypad Star Spangled Banner is HERE in mp3 format (it's only 60 KB).

Told you it was off key, but at least it's recognizable... :)

#3 mockingbird

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Posted 17 February 2005 - 05:48 PM

Don't quit your dayjob :)

#4 Erik98225

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Posted 17 February 2005 - 08:03 PM

Don't quit your dayjob :)

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LOL.... I am a college student and was just playing with my cell phone during a cancelled 2 hour class... I have no intentions of becoming a touch tone composer :)

#5 ehurtley

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Posted 17 February 2005 - 08:56 PM

So it used to be (in pre-microchip touch-tone phones) that the tone each key generated was the combination of the 'row' tone and the 'column' tone. (You'll notice that each key in a given row or column has one of it's two component tones the same.) You could, on some phones, press two keys at once that were in the same row or column to get only that row or column tone, not the harsh 'chord' tone that makes up the actual DTMF tones. (It also wouldn't dial, since the DTMF 'processor' relies on the chord.) It was much easier on the ear to play music this way. (If you have a really old touch-tone, try it. Press 1 and 7 (or 1 and 4, or 1 and *, or 4 and 7, 4 and *, or 7 and *, any two keys in that column make the same tone,) and you'll get a less harsh tone.) I used to be able to play pretty passable music this way.
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#6 Erik98225

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Posted 23 February 2005 - 09:24 AM

My other "great accomplishment of boredom" is a BASIC program I wrote back in 1996 which I called Hiroshima.

Skyscrapers appear, bombs drop, night falls as the city is annihilated. Thunder and sound effects too.

As impressive as it looks, the program is pathetically simple.... the bomb X and Y are incremented by a random amount every few milliseconds, and the bomb blows up when it hits something that's not blue. Everything is done with a random number generator and a read from video memory. The whole thing is only 37 KB almost all of which is garbage inserted by the BASIC compiler.

You can download the EXE HERE.

This is version 2.0 because I added a feature where pressing 1, 2, 3, 4, or 5 at the title screen changes the color of the explosion (5 is the "psychedelic mode"...)

If you run it from XP there is a small chance that it will crash... it does on my system, but it used to work on this same system. Probably a video driver update that it doesn't like. In any case, if it doesn't work for you, you can always boot into DOS...

Oh. To get out of it, just press the spacebar. :)



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