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2. Sony Dream Machine - Wikipedia

   en.wikipedia.org/wiki/Sony_Dream_Machine

   In the mid 1960s, Sony introduced the first Dream Machine. The basic idea was to use a radio program to wake up users more pleasantly, as many people found the loud mechanical alarm made by traditional alarm clocks disturbing. The use of direct-read digital display as opposed to a traditional clock dial gave the design a modernistic feel, which ...

3. AM broadcasting - Wikipedia

   en.wikipedia.org/wiki/AM_broadcasting

   AM broadcasting. AM broadcasting is radio broadcasting using amplitude modulation (AM) transmissions. It was the first method developed for making audio radio transmissions, and is still used worldwide, primarily for medium wave (also known as "AM band") transmissions, but also on the longwave and shortwave radio bands.

4. Digital Radio Mondiale - Wikipedia

   en.wikipedia.org/wiki/Digital_Radio_Mondiale

   Digital Radio Mondiale ( DRM; mondiale being Italian and French for "worldwide") is a set of digital audio broadcasting technologies designed to work over the bands currently used for analogue radio broadcasting including AM broadcasting —particularly shortwave —and FM broadcasting. DRM is more spectrally efficient than AM and FM, allowing ...

5. Radio clock - Wikipedia

   en.wikipedia.org/wiki/Radio_clock

   Radio clock. A modern LF radio-controlled clock. A radio clock or radio-controlled clock (RCC), and often colloquially (and incorrectly [1]) referred to as an "atomic clock", is a type of quartz clock or watch that is automatically synchronized to a time code transmitted by a radio transmitter connected to a time standard such as an atomic clock.

6. Frequency synthesizer - Wikipedia

   en.wikipedia.org/wiki/Frequency_synthesizer

   A frequency synthesizer is an electronic circuit that generates a range of frequencies from a single reference frequency. Frequency synthesizers are used in many modern devices such as radio receivers, televisions, mobile telephones, radiotelephones, walkie-talkies, CB radios, cable television converter boxes, satellite receivers, and GPS ...

7. Automatic frequency control - Wikipedia

   en.wikipedia.org/wiki/Automatic_frequency_control

   У = RF amplifier stages, Д = frequency discriminator stage. In radio equipment, Automatic Frequency Control ( AFC ), also called Automatic Fine Tuning ( AFT ), is a method or circuit to automatically keep a resonant circuit tuned to the frequency of an incoming radio signal. It is primarily used in radio receivers to keep the receiver tuned ...