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HK Thiele Preprint Index

H K Thiele Preprint Index

Altho Heintz H K Thiele presented a number of papers on audio engineering history at several European Conventions, only one of these papers was ever published in the Journal. There were, however, English-language preprints of these papers, which are listed below (from the Index to the AES Electronic Library).  These papers are all available for purchase from the AES for 20 $ each (non-members), or 5 $ (members). 

Thiele also chaired a session on "Audio Technology in Berlin to 1943", and those preprints are available as a package, at a special price.


The 25 Essential Steps in the Development of Analogue Magnetic Sound Technology 8198154 bytes (CD aes14)
Author(s): Thiele, Heinz H. K.
Publication: Preprint 4708; Convention 104; April 1998
Abstract: This presentation about the development of analog magnetic sound technology attempts to describe inventions, new procedures, components, equipment, ranges of application, as well as markets and events, all of which offer information about changing technology standards.

Audio Engineering in the Field of Aviation Security 1733542 bytes (CD aes13)
Author(s): Thiele, Heinz H. K.
Publication: Preprint 3950; Convention 98; January 1995
Abstract: Audio engineering activity is not only devoted to entertainment and education but also to many other aspects that are both scientifically stimulating and important contributions to society, for example, in the diagnosis and treatment of hearing problems and the increasing uses of ultrasound technology. This is especially evident in the field of aviation security. From the early 1960s, the recording by the cockpit voice recorder and eventual interpretation of sound events resulting from accidents and incidents have been of major importance in the improvement of security for this ever-increasing sector of the traveling public. This presentation explains the initial problems, history, design, function, technical data, and application of voice recorders in the context of the Fairchild A 100 system and introduces the digital A 100 S, using solid-state technology as a storage medium instead of tape, which replaced the A 100 system in 1993. The paper also discusses the cockpit voice recording and interpretation of a crash at Kennedy Airport in 1968, which was established as being caused by human error.

Audio Technology in Berlin to 1943: Magnetic Sound Activities 4128996 bytes (CD aes12)
Author(s): Thiele, Heinz H. K.
Publication: Preprint 3488; Convention 94; February 1993
Abstract: In 1900, the Berlin company Mix & Genest began manufacturing magnetic sound recorders. The further development of Pulsen's Telegraphon did not take place until tube amplifiers became available in the early 1920s. Typical Berlin recorders, all of them with information carriers made of steel, were the Vox dictating machine, the Stille SEPMAG transport, the Echophone Dailygraph, and the Lorenz Stahlton-Bandmaschine (Steeltone-Tapemachine). In 1935 the AEG Magnetophon K1 started the magnetic tape era and by introducing ac biasing in 1940 and two-channel stereophonic technology in 1943, a previously unknown reproduction quality was obtained.

The Austrian Pfleumer Invented and Introduced Magnetic Tape 2863119 bytes (CD aes12)
Author(s): Thiele, Heinz H.K.
Publication: Preprint 3236; Convention 92; February 1992
Abstract: Preservation and restoration of tape recordings presupposes the existence of magnetic tape. That's a platitude. In Vienna it seems justified to report upon the life and activities of a man·the Austrian engineer Pfleumer·who in 1928 not only invented magnetic tape but, in contrast to inventors before him, succeeded in the realization and application of his idea.

50 Years of AC-Bias: Dr. Walter Weber Accomplishes HI-FI Recording 351536 bytes (CD aes11)
Author(s): Thiele, Heinz H.K.
Publication: Preprint 2913; Convention 88; February 1990
Abstract: Dr. Weber by coincidence found out about the advantages of ac-biasing in connection with tape recorders. After clarification of the theory involved with Dr. H.J. von Braunmuhl he was successful in the introduction of the new HIFI recording system in the German readiostudios. German disc-companies and filmstudios follwed already before 1945. The Weber invention became a worldwide accepted system after World War II. The other two ac-bias inventions before 1940 did not bring out results.

Evaluating Audio Inventions and Innovations 3684099 bytes (CD aes11)
Author(s): Thiele, Heinz H. K.
Publication: Preprint 2803; Convention 86; February 1989
Abstract: Solitary inventions and innovations can't be regarded as landmarks in the history of technical evolution; introduction to daily use is equally significant. Three examples in audio technology illustrate the ways in which the technical and economic development of magnetic recording have depended on the work of single individuals: Friedrich Plfeumer for magnetic tape development, von Braunmuhl/Dr. Weber in the field of AC biasing, John T. Mullin for effecting magnetic recording in the United States.

Magnetic Film Transport Based on the SEPMAG Method: Basis and Developmental Program from the First Unit up to the Present Time 5934945 bytes (CD aes11)
Author(s): Thiele, Heinz
Publication: Preprint 2356; Convention 80; February 1986
Abstract: Already 1914 a SEPMAG transport has been patented and in 1929 the first unit came into being. After the invention of acbiasing in 1941 developments begun at Berlin which finally creates the present technology. Resulted by the war and its consequences magnetic film in the first instance was pursued in USA. 1950 appeared the transport MTK 1 as Berlin's contribution to the state of the art. Meanwhile equipment exists combined with high sophisticated electronics which permits the link of SEPMAG transports with any other sound and picture source, video as well.

Magnetic Sound Recording in Europe up to 1945 5355039 bytes (CD aes4)
Author(s): Thiele, Heinz H. K.
Publication: Volume 36 Number 5 pp. 396·408; April 1988
Abstract: The 50th Anniversary of the Magnetophon. This jubilee was an occasion for audio engineers to look back on how the tape recorder was born and to see what has become of it. Its evolution during the years from 1888 to almost 1945 is discuss

Audio Equipment on Aircraft 7476538 bytes (CD aes14)
Author(s): Thiele, H. H. K.
Publication: Preprint 4479; Convention 102; February 1997
Abstract: An important event marked the development of the airline industry during the late forties: the installation of audio equipment aboard aircraft. The equipment was used by members of the crew to communicate among themselves as well as with passengers. Later on the equipment was expanded to provide a comprehensive entertainment program of music, movies, and videos. This paper presents the developments of such audio equipment using as a model aircraft that has been flown by the German airlines.

Some Remarkable Firsts in Magnetic Recording Created and Used by the German System Until 1944 2898791 bytes (CD aes11)
Author(s): Thiele, H. H. K.
Publication: Preprint 2637; Convention 84; February 1988
Abstract: The following system and process firsts occurred in the years from 1936 to 1944 at the instigation of the RRG (Reichs-Fundfunk-Gesellschaft·German Broadcasting Company), or its own development work, on the basis of the Magnetophon tape recorders of AEG and the magnetic tapes from the Ludwighafen works of IG Farben, today BASF: 1) 1936, "Káse" transportable, spring-driven magnetic tape recorder; 2) 1939 Magnetic tape studio recording equipment RRG R 122; 3) 1939 Transportable magnetic tape recorder RRG R 23; 4) 1940 Dramatic improvement in frequency response and dynamic range achieved by recording on magnetic tape with powdered storage coating by high frequency biasing, in accordance with German Patent DRP 743 411; 5) 1942 Magnetic tape studio recording equipment RRG R 122a with high frequency biasing of tape; 6) 1942 Magnetic tape studio recording equipment with AEG Magnetophon K 7 as transport drive mechanism and high frequency biasing of the tape, for stereophonic recording and playback; and 7) 1944 Transportable magnetic tape recorder RRG R 26 with high frequency biasing of the tape, tape speed about 18 cm/s.

J. McKnight
2003-11-16, rev 2007-01-05

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