Abstract: A dynamic range compression technique incorporates four novel concepts. The first is the use of a critical band multichannel structure for improved perceptual transparency. The second is the use of attack and release rates, instead of attack and release times, to affect gain control and adaptation of the compressor to changes in the input level. The third concept involves a level estimate control mode which permits increased adaptability using variable weightings of the contribution of both RMS and peak level estimates to gain control. Finally, the fourth concept involves the normalization of the level estimates to reduce or eliminate spectral distortion. These concepts provide a dynamic range compressor with improved perceptual transparency, especially with respect to music.

Abstract: A variable speed film transport interlock control system for allowing a plurality of film audio elements to be run in synchronization with each other with at least one film element running at a different selected speed than the other elements and permitting internal generation of quadrature control signals by an internal microprocessor. The system generates a modified drive signal from a selected standard system drive signal or microcomputer generated signal such that the modified signal corresponds to a speed with a fixed ratio to the speed of the selected unprocessed drive signal under all operating conditions. This permits the modified signal to drive a film transport device, such as a recorder or reproducer, at a different speed than other transport devices while maintaining synchronization with the other devices during forward or reverse, stopping and starting, high speed or low speed operation.

Abstract: A variable speed film transport interlock control system for allowing a plurality of film audio elements to be run in synchronization with each other with at least one film element running at a different selected speed than the other elements. The system generates a modified drive signal from a standard system drive signal such that the modified signal corresponds to a speed with a fixed ratio to the speed of the standard drive signal under all operating conditions. This permits the modified signal to drive a film transport device, such as a recorder or reproducer, at a different speed than the other transport devices while maintaining synchronization with the other devices during forward or reverse, stopping and starting, high speed or low speed operation.