Ringtone Basics
If you've read How Cell Phones Work, you know the central "brain" of a cell phone is a small microprocessor. Just like the microprocessor in a computer, this unit controls everything that the cell phone does, working from information stored in the phone's memory.
At its core, a ringtone is simply a computer program stored on the cell phone's memory chip. This program's sole purpose in life is to tell the microprocessor what the phone's speaker system should do when the phone's receiver picks up an incoming call.
Ringtone-capable phones already have a range of notes stored in memory (that is, they include information on speaker vibration frequencies that will produce particular tones). The ringtone program only has to tell the microprocessor which of these notes to play, in which order and at what speed. By adjusting these variables, the microprocessor can play an infinite number of ringtones.
The clearest example of this sort of programming language is the Ringing Tone Text Transfer Language (RTTTL) format, developed by Nokia. Here's a typical section of RTTTL code, with a description of what each bit means.
In order to enable a ringtone on your phone, you just have to get the appropriate program into the phone's memory. In the next section, we'll look at the different ways you can do this.
Polyphonic Ringtones
Polyphonic ringtones, as the name implies, employ various tones and sounds rather than just the simple one-tone typical ringtone. For instance, if you have polyphonic ringtones that are musical, you can have a drum or a bass line accompanying a melody or someone speaking while there is music playing. Polyphonic ringtones are more sophisticated and many believe that they are much more interesting than standard, monophonic ringtones. Contrary to popular belief, polyphonic ringtones are not necessarily more expensive; in fact, it is quite possible to find a good selection of free polyphonic ringtones.
One of the most popular choices for polyphonic ringtones is music. On free ringtone website, you can find a staggering variety of polyphonic ringtones in the music category. If you can imagine a musical style, it is available, from reggae to polka to Hindi music. Free ringtone downloads are so easy to obtain, that many people change their ringtones often because they enjoy so many different sounds. Whether you would like your own signature tune or to switch songs frequently, you can find great musical polyphonic ringtones on free sites.
Some enjoy more sophisticated ringtones, and polyphonic ringtones can accommodate a speaker's voice and music in the background. There are comic ringtones featuring, for instance, Austin Powers speaking with the comic theme song in the background or aliens saying "Earth to (your name) with the sound of a space ship zooming along." Many of these polyphonic ringtones are free, but it is not unusual to find some that cost a certain amount of money. However, the cost is usually very moderate, and with ringtones, you often get what you pay for.
It is possible to compose your own polyphonic ringtones; this is a particularly good idea if you are musically inclined and you can't find your favorite tune among ringtone selections. When you compose polyphonic ringtones, you will need more than just the keypad on your phone to plunk out a simple melody. You will want bass or other accompaniment, or perhaps a melody line. It is possible to design such a ringtone if you have the right equipment, or to record it and download it onto your phone.
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If you are downloading a polyphonic ringtone from a site, you will need to fill out some simple information, such as you country (perhaps your address) and your cell phone number. The company will send the ringtone to your phone and you can use it immediately. If you are paying for a ringtone, you will need to fill in your credit card information. Always check to make sure that the company is a reputable one and not a shifty organization that is simply trying to get access to your phone or to your credit card information. Work along with friends as a team and take their recommendations if they have been successful. A company with a proven track record is unlikely to be a fraud.

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