Shanise Levi 2 nd Period Mr. Hardin

In the 1920’s–1940’s  In 1921 The first commercial AM radio broadcast is made by KDKA, Pittsburgh PA.  In 1925 the first electrically recorded 78 rpm disks appear and RCA works on the development of ribbon microphones.  In 1938 RCA develops the first column loudspeaker array.  In 1940 Walt Disney's "Fantasia" is released, with eight-track stereophonic sound.  In 1942 The first stereo tape recordings was made by Helmut Kruger at German Radio in Berlin.  In 1943 Altec develops their Model 604 coaxial loudspeaker.

In the 1950’s-1960’s  In 1954 a lot of things happen like Sony produces the first pocket transistor radios, The first commercial 2-track stereo tapes are released, Ampex produces its Model 600 portable tape recorder and RCA introduces its polydirectional ribbon microphone, the 77DX.  In 1955 Ampex develops "Sel-Sync" (Selective Synchronous Recording), making audio overdubbing practical.  In 1956 Les Paul makes the first 8-track recordings using the "Sel-Sync" method.  In 1958 the first commercial stereo disk recordings appear.  In 1963 Philips introduces the Compact Cassette tape format, and offers licenses worldwide.

In the 1970’s  In 1970 Ampex introduces 406 mastering tapes.  In 1971 Denon demonstrates 18-bit PCM stereo recording using a helical-scan video recorder.  In 1976 Dr. Stockham of sound stream makes the first 16-bit digital recording in the U.S. at the Santa Fe Opera.  In M introduces metal-particle cassette tape. Also the first EIAJ standard for the use of 14-bit PCM adaptors with VCR decks is embodied in Sony's PCM-1 consumer VCR adaptor.

In the 1980’s  In 1980 Sony introduces a palm-sized stereo cassette tape player called a "Walkman." Also 3M, Mitsubishi, Sony and Studer each introduces a multitrack digital recorder and EMT introduces its Model 450 hard-disk digital recorder.  In 1981 IBM introduces a 16-bit personal computer.  In 1982 Sony introduces the PCM-F1, intended for the consumer market, the first 14- and 16-bit digital adaptor for VCRs. It is eagerly snapped up by professionals, sparking the digital revolution in recording equipment and also Sony release the first CD player, the Model CDP-101.  In 1984 The Apple Corporation markets the Macintosh computer.  In 1985 Dolby introduces the "SR" Spectral Recording system.  In 1986 the first digital consoles appear.

In the 1990’s  In 1991 the Ampex introduces about 500 mastering tapes.  In 1995 the first “solid-state” audio recorder, the Nagra ARES-C, is introduced. It is a battery-operated field unit recording on PCMCIA cards using MPEG-2 audio compression.  In 1996 Record labels begin to add multimedia files to release, calling them ”enhanced CDs.” Also, experimental digital recording are made at 24 bits and 96 kHz.  In 1997 DVD videodiscs and players are introduced.  In 1998 Mp-3 players for downloaded Internet appear.  In 1999 Audio DVD Standard 1.0 agreed upon by manufactures.

Credits          dDigitalAudio_wc2.pdf dDigitalAudio_wc2.pdf  

The End Audio!