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Expired patents [ 10] MP3 (formally MPEG-1 Audio Layer III or MPEG-2 Audio Layer III) [ 4] is a coding format for digital audio developed largely by the Fraunhofer Society in Germany under the lead of Karlheinz Brandenburg, [ 11][ 12] with support from other digital scientists in other countries.
In 1923, Lee de Forest applied for a patent to record to film; he also made a number of short experimental films, mostly of vaudeville performers. William Fox began releasing sound-on-film newsreels in 1926, the same year that Warner Bros. released Don Juan with music and sound effects recorded on discs, as well as a series of short films with ...
Digital recording and reproduction converts the analog sound signal picked up by the microphone to a digital form by the process of sampling. This lets the audio data be stored and transmitted by a wider variety of media. Digital recording stores audio as a series of binary numbers (zeros and ones) representing samples of the amplitude of the ...
Timeline of audio formats. An audio format is a medium for sound recording and reproduction. The term is applied to both the physical recording media and the recording formats of the audio content —in computer science it is often limited to the audio file format, but its wider use usually refers to the physical method used to store the data.
History of television. Family watching TV, 1958. The concept of television is the work of many individuals in the late 19th and early 20th centuries. The first practical transmissions of moving images over a radio system used mechanical rotating perforated disks to scan a scene into a time-varying signal that could be reconstructed at a ...
Color television. An RCA Victor Color TV ad featuring milliner Lilly Daché in 1959. Color television ( American English) or colour television ( Commonwealth English) is a television transmission technology that includes color information for the picture, so the video image can be displayed in color on the television set.
1877 : Thomas Edison and Emile Berliner simultaneously invented the first prototypes of the phonograph. 1888 : Thomas Edison introduces the electric motor-driven phonograph. 1896 : Edwin S. Votey completes the first Pianola. 1898 : Valdemar Poulsen patents the Telegraphone. 1906 : Thaddeus Cahill introduces the Telharmonium to the public.
This system produced a dim orange image 1.5 inches (3.8 cm) square, with 48 scan lines, at a frame rate of 7.5 frames per second. Mechanical television or mechanical scan television is an obsolete television system that relies on a mechanical scanning device, such as a rotating disk with holes in it or a rotating mirror drum, to scan the scene ...