Stereophon Sound recording System

Developed by Dr. Carlheinz Becker



Reported by:

Lieut. H.B. Lee, III, USNR

Naval Technical Mission in Europe


CIOS Target Number 9/357

Physical & Optical Instruments & Devices


July 1945



This report describes a system intended primarily for high quality sound recording on film. It was privately developed by a German physicist Dr. Carlheinz Becker of Thansau über Rosenheim. The system employs well-known means in some respect, but has the important advantage of giving excellent 3-channel reproduction of great dynamic range and low noise level using a sound track of total width of only 2.65 millimeters.


The system described here was developed by Dr. Carlheinz Becker of Thansau über Rosenheim, Germany. Dr. Becker is a capable German physicist who started development of the system in 1938. Her worked without government interference until 1942 when he was ordered to convert it to an explosion power recorder for which it is well suited in many respects. In 1944, work on the recorder was stopped and Dr. Becker was put in making high voltage regulated power supplies for laboratory use. several of these were delivered. These are excellent quality but present no advance over our own designs.

b)    Dr. Becker, as do most Germans now, professes to be willing to undertake development work for the Allies. It should be said that he and his staff (about 10 or 12 men) are thoroughly competent. They have a small but very well equipped laboratory and machine shop. Both are undamaged, have power available, and could start work at once.


Keywords:    The system is termed the "Stereophon" system .. The additional reason is that a simple channel requieres a film sound track of 0.7 millimeters and three channels require a track of 2.65 millimeters..Signal frequency range 23 - 10,000 Hz, Dynamic range 60 db without resert to expansion and compression .. Distorsion less than 3 % over the whole dynamic range, Fim noise 70 db below the greatest amplitude .. Film velocity - 45 cm/sec.



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