The Technology That Lies Behind The Cordless Telephone

These days it seems that radio technology is being incorporated into a range of different products

, including your microwave, your baby monitor, your wireless Internet connection, and last but not least your cordless telephone. Although the telephone was invented as long ago as 1876, when Alexander Graham Bell first spoke those now famous words Mr Watson come here I want to see you, it was not until 1965 that Teri Pall, a jazz singer, identified the advantages to being able to move freely whilst on the phone and introduced the cordless telephone.

The first wireless telephones were only capable of transmitting signals on low frequencies. This meant that they were prone to picking up unwanted interference from other devices transmitting radio waves. This made them somewhat less useful depending on the extent of the interference, however it wasnt too long until models emerged that were able to transmit signals on higher frequencies, these could transmit signals over long distances without any interference.

The comparison of the traditional corded telephone and the cordless telephone brings light to some interesting factors. The corded telephone relies on acoustics to transmit an analogue signal back and forward between the caller and receiver. The hook connects the user to the phone network and the sound is converted through a microphone and speaker. There is also a dial and a bell for dialling and receiving calls; on modern phones this is usually replaced with an electric keypad and ring tone. Probably the most important difference between the corded telephone and the cordless telephone is the fact that the cordless telephone relies on radio transmissions, removing the need for a wire.

The cordless phone converts signals into radio waves with frequencies, which can be transmitted wire free; this conversion is done using quartz crystals. The signals are broadcasted using an antenna and boosted using an amplifier. So that the user can speak and listen simultaneously a two-way frequency is used. When the telephone rings a signal is sent to both the handset and the base, this increases the chances of the phone being heard no matter what the location.

Aside from the obvious, radio technology, modern cordless telephones have a number of features that are available, for instance the caller ID, illuminated keypads, and a variety of different ring tones. There are now even models that are capable of detecting when it is night time and will adjust their ring volume accordingly. It is also common for cordless telephones to have LED lights installed as a warning to the user that the phone is going out of range or perhaps running out of power.

by: tyler durdon

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