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Alarm clock

Types of Alarm Clocks: – Traditional analogue clocks – Mechanical alarm clocks with bells powered by a mainspring – Electronically operated bell-type clocks using electromagnetic […]

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Types of Alarm Clocks:

– Traditional analogue clocks
– Mechanical alarm clocks with bells powered by a mainspring
– Electronically operated bell-type clocks using electromagnetic circuits
– Clepsydras with added dial and pointer by Ctesibius
– Striking clocks like the one devised by Yi Xing in China
– Digital alarm clocks with various noise options
– Battery-powered clocks producing buzzing, ringing, or beeping sounds
– Novelty clocks that can speak, laugh, sing, or play nature sounds
– Integration of alarm functions in modern devices like TVs, phones, and watches
– Clock radios that start playing radio at set times

Historical Development of Alarm Clocks:

– Plato’s water clock with an alarm signal
– Ctesibius adding alarm systems to clepsydras
– Cassiodorus recommending water clocks as alarms
– Description of a complex public clock in Gaza by Procopius
– Integration of striking clocks in astronomical clocks by Chinese engineers
– Evolution of clock towers in Europe with fixed chimes
– Introduction of user-settable mechanical alarm clocks in the 15th century
– Creation of the first American alarm clock in 1787
– Antoine Redier’s patent for an adjustable mechanical alarm clock in 1847

Clock Radios:

– Definition and combination of alarm clock and radio receiver
– Radio turning on at designated times to wake the user
– Placement on bedside stand with features like dual alarms and snooze buttons
– Inclusion of a sleep timer to turn the radio on for a set time
– Ability of newer models to play music from iPod, iPhone, or CD
– Options for alarm triggering from a set radio station or music source
– Availability of docks for iPod/iPhone that can charge the device
– Playing of AM/FM radio, iPod/iPhone, or CD, including nature sounds like rain or forest

Alarms in Technology:

– Computer alarms with software programs for personal computers
– Web-based alarm clocks with personalized tones
– Native applications waking computers using real-time clock alarm chip
– Mobile phone alarms with built-in alarm clocks in modern phones
– Alarms that work even when the phone is off, with the ability to set alarm ringtones
– Next-generation alarms like Sleeptracker alarm clock tracking sleep phases
– Use of sensing technologies like EEG electrodes and dawn simulators
– Specialized alarms for impaired hearing, including flashing lights or vibrations
– Time switches for turning on lights, bells, radio, TV, or preparing tea or coffee automatically

Innovative Alarm Clock Applications:

– Devices beyond traditional alarm clocks for waking sleepers
– Complex waking procedures to prevent adaptation
– Connection to vibrating devices for waking individuals with impaired hearing
– Ensuring wake-up for individuals with impaired hearing through alarms with flashing lights or vibrations
– Downloading music for waking, personalized alarm settings, and alarms with flashing lights or vibrations
– Use of alarms with dawn simulators to mediate sleep inertia and alarms with complex waking procedures

Alarm clock (Wikipedia)

An alarm clock or alarm is a clock that is designed to alert an individual or group of people at a specified time. The primary function of these clocks is to awaken people from their night's sleep or short naps; they can sometimes be used for other reminders as well. Most alarm clocks make sounds; some make light or vibration. Some have sensors to identify when a person is in a light stage of sleep, in order to avoid waking someone who is deeply asleep, which causes tiredness, even if the person has had adequate sleep. To turn off the sound or light, a button or handle on the clock is pressed; most clocks automatically turn off the alarm if left unattended long enough. A classic analog alarm clock has an extra hand or inset dial that is used to show the time at which the alarm will ring. Alarm clock functions are also used in mobile phones, watches, and computers.

A traditional wind-up (key-wound), mechanical spring-powered alarm clock

Many alarm clocks have radio receivers that can be set to start playing at specified times, and are known as clock radios. Additionally, some alarm clocks can set multiple alarms. A progressive alarm clock can have different alarms for different times (see next-generation alarms) and play music of the user's choice. Most modern televisions, computers, mobile phones and digital watches have alarm functions that automatically turn on or sound alerts at a specific time.

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