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Brief History of Sound Recording and Broadcasting Technology
James Maxwell's electromagnetic wave theory becomes the basis for radiowave propogation.
First description of recording sound onto a cylinder or disc described by Charles Cros in France and Thomas Alva Edison in the United States.
Thomas Edison patents the recording of sound onto discs and cylinders.
Heinrich Hertz transmits and receives radio waves over short distances.
Emile Berliner shows first example of a working "phonograph"playback device.
Basics of magnetic recording put forth by Oberlin Smith.
Danish inventor Valdemar Poulsen patents the first magtnetic recorder.
Development of first wireless telegraph system by Guglielmo Marconi.
First electron tube developed by Sir Ambrose Fleming.
First wireless communication of human speech.
Development of the 'Audion' vacuum tube amplifier by Lee de Forest, leadingthe way towards the electronic amplification of sound.
KDKA in Pittsburgh, Pennsylvania is licensed as the very first radio "staion" to broadcast to the public - announcements, prize fight results and shipping traffic info along with a violin solo on Christmas Eve 1919.
The first COMMERCIAL radio station - playing music interspersed with time announcements, weather information, sports, news, and paid commercial announcements for local sponsors (in other words what we now call modern radio) signed on the airwaves as XGA, in Montreal, Canada early in 1920. That station, still on 600 KHz AM in Montreal is call-signed CFCF. Currently privately owned, the station was once owned by Guglielmo Marconi (yes, the inventor of wireless).
First electronic recordings made with the use of a microphone released tothe public.
First stereo recordings made by Bell Telephone Laboratories, fore xperimental use.
Theory of frequency modulation (FM) for radio broadcasts developed by Edwin Armstrong.
Development of the tweeter and woofer in loudspeaker technology to reduce loudspeaker distortions.
The first true magnetic tape recorder, the Magnetophone, is issued.
'AC Bias' added to tape recordings to improve sound quality.
Introduction of Long Play (LP) record by CBS.
First transistor introduced.
RCA makes the 45 rpm, 7 inch disc available.
Developmental work on the acoustic suspension loudspeaker done by Harry Olsen.
Introduction of stereo tapes to the public.
Edgar Villchur and Henry Kloss begin to popularize the acoustic suspensionloudspeaker.
First stereo LP records released.
First stereo FM radio broadcasts.
Philips makes public the compact cassette.
1975 - 1978
Early digital recording made.
Sony introduces the "Walkman".
First CD player made available through technology developed by Sony and Philips.
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