Electronic Musical Resources
Electronic Musical Resources: Patents : Processors
Speech and speech processing
Concerning nondigital devices for independently altering the duration and pitch of recorded signals, called by many names, including: Information Rate Changers, Time Stretcher/Compressors, Zeitdehner, and Pitch-and-Frequency changers.
- "Method of and Apparatus for Varying the Length of Sound Records", Berthold Freund, US Patent 1996958, 1935. method of varying relative read and write speeds of optical recordings.
- "Sound Translating Apparatus", E Schueller US Patent 2195192, 1940. a non-rotating head
- "Sound Reproducer", E Schueller US Patent 2352023,1944. rotating head with multiple "overlapping" reproducers to stretch or compress time scale without altering pitch.
- "Recording Device", Fairbanks, Everitt, & Jaeger, US Patent US2886650, 1959.
- "Recording Device", Fairbanks, Everitt, & Jaeger, Canadian Patent ÊCA639831, 1962.
- "Method and Device for Producing Signals or Sound", Fairbanks, Everitt, & Jaeger, Canadian Patent CA639832, 1962.
- "Recording and Method of Making Same", Fairbanks, Everitt, & Jaeger, Canadian Patent CA640070, 1962.
From Anton Springer came the Springer Machine used in many european tape studios.
- "Rotatable electromagnetic transducers", Anton Springer, US PatentÊUS2977423, 1961.
- "Rotatable electromagnetic transducer system", Anton Springer, US Patent US3022383, 1962.
- "Rotatable magnetic systems for transforming audio currents", Anton Springer, US Patent US3047673, 1962.
- "Electromagnetic transducer", Anton Springer, US Patent US3064088, 1962.
- "Magnetic recording and playback systems", Anton Springer, US PatentÊUS3077587, 1963.
Concerning artificial reverberation
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