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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.
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.
In December 1931, he submitted a patent application including the idea, and in 1933 this became UK patent number 394,325. [27] Over the next two years, Blumlein developed stereo microphones and a stereo disc-cutting head, and recorded a number of short films with stereo soundtracks.
A person singing karaoke in Hong Kong ("Run Away from Home" by Janice Vidal). Karaoke (/ ˌ k ær i ˈ oʊ k i /; [1] Japanese: ⓘ; カラオケ, clipped compound of Japanese kara 空 "empty" and ōkesutora オーケストラ "orchestra") is a type of interactive entertainment system usually offered in clubs and bars, where people sing along to pre-recorded accompaniment using a microphone.
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.
The bias (D.C.) on the grid had to be positive to get amplification... power gain 1.3 voltage gain 15 on a plate bias of about 15 volts". [14] Brattain and H. R. Moore made a demonstration to several of their colleagues and managers at Bell Labs on the afternoon of 23 December 1947, often given as the birth date of the transistor.
The earliest known audio tape recorder was a non-magnetic, non-electric version invented by Alexander Graham Bell's Volta Laboratory and patented in 1886 (U.S. patent 341,214). It employed a 3 ⁄ 16 -inch-wide (4.8 mm) strip of wax-covered paper that was coated by dipping it in a solution of beeswax and paraffin and then had one side scraped ...
At the beginning of the century, he held 736 U.S. patents. His final count was 1,093 U.S. patents, including 1084 utility patents (patents for inventions) and 9 artistic design patents. It was not until June 17, 2003 that he was passed by Japanese inventor Shunpei Yamazaki. [2]