Magnetophon

History

Germany

Later in 1939, the Fe₃O₄ oxide was replaced by the Fe₂O₃ type, which gave a significantly better recording quality, so much that the formula became a worldwide standard until the 1970s when Chrome Dioxide tapes appeared.

Adding a DC bias to the record head gave some improvement, and in 1941, AEG engineers Hans Joachim von Braunmühl and Dr. Walter Weber accidentally discovered the technique of AC tape bias in which the addition of an inaudible high-frequency tone resulted in a striking improvement in sound quality. The discovery was made when a Magnetophone producing recordings of extraordinary quality was sent 'for repair'. The machine proved to have an oscillating DC bias amplifier. Magnetic media is inherently non-linear, but AC bias was a technique whereby the tape's magnetisation was left in a state proportional to the instantaneous audio electrical signal. The Magnetophon became a high fidelity recording system that outperformed gramophone recording (which was the 78 rpm system at this time).

Many speeches, concerts, and operatic performances were recorded. Since many of the recordings survived World War II they were later issued on LPs and compact discs. One of the more remarkable series of recordings took place at the Vienna State Opera House, also known as Wiener Staatsoper, in 1944, when the German composer Richard Strauss recorded many of his famous symphonic poems, including Don Juan, Till Eulenspiegel, and Also sprach Zarathustra, with the Vienna Philharmonic Orchestra.

AEG engineers made rapid strides in perfecting the system and had practical stereo recorders by 1943. Until 1945, about 250 stereophonic tape recordings were known to exist, including some Richard Strauss and Furtwangler. Only three survived. This includes a performance of Beethoven's "Emperor" Concerto with pianist Walter Gieseking and the Berlin Reichssenders Orchestra conducted by Artur Rother. This remarkable performance was later issued on LP by Varèse Sarabande. Later in 1993, the Audio Engineering Society (AES) issued a special CD for the 50th birthday of stereo recording. This CD not only includes the "Emperor" Concerto, but the two other stereo recordings known to exist: a Brahms Serenade and the last movement of Bruckner's 8th Symphony conducted by Karajan. Piano Library also issued the Emperor concerto, and Iron Needle issued the Brucker recordings (catalog IN 1407). Archiv Music released a CD of the concerto, as well a later recording Gieseking made of Beethoven's first piano concerto with the Rafael Kubelik and the Philharmonia Orchestra.

Magnetophon recorders were widely used in German radio broadcasts during World War II, although they were a closely guarded secret at the time. Allied intelligence experts knew that the Germans had some new form of recording system but they did not know the details of its construction and operation until working models of the Magnetophon were discovered during the Allied invasion of Germany during 1944-45.

American audio engineer Jack Mullin acquired two Magnetophon recorders and fifty reels of magnetic tape from a German radio station at Bad Nauheim near Frankfurt in 1945. The allied forces were traveling through Germany during WWII when they first discovered the new device. The Aliies then handed the Magnetophon over to Mullin. Over the next two years Mullin modified and developed these machines, hoping to create a commercial recording system that could be used by movie studios. American popular vocalist Bing Crosby would use the technology, as modified by Mullin and the fledgling Ampex company, to record his radio broadcasts in the more relaxed atmosphere of the recording studio, which was a significant break from the then-norm of live studio audience broadcasts.

As a generic noun

See also

References

Friedrich K. Engel, "Chapter 5: The Introduction of the Magnetophon". In ISBN 0780347099

Category:1935 introductions Category:Audio storage Category:Consumer electronics brands Category:Sound recording technology