Class 381/19 - Quadrasonic

Subclass of Class 381 - Electrical audio signal processing systems and devices
Definition: Subject matter in which four independent sound signals are
No. of patents: 85
Last issue date: 01/04/2011

Number	Title	Issue Date
3956709	Balance control system for multichannel audio apparatus A balance control system for multichannel audio apparatus wherein stereophonic signals are transmitted through plural audio channels of the audio apparatus. The balance control system includes a balance control network connected to the audio channels for ...	05/11/1976
3952156	Signal processing system A system for processing a plurality of audio signals to generate binaural output signals. The signal processor has a manually operated spatial position control which provides a correspondence between movement of the control and the binaural perception of ...	04/20/1976
3940560	Quadriphonic sound pick-up and reproduction devices A sound pick-up and reproducing system, comprising a first and a second pair of directional microphones respectively disposed at a first and a second given distance from the sonic scene to be transmitted, said second distance being greater than said first...	02/24/1976
3939451	Balance control for use in 4-channel stereophonic system A balance control comprises a box-type frame, a plurality of variable resistors individually mounted on each side wall of the frame, the upper plate of the frame having a large hole, a pair of auxiliary plates attached to the surface opposite the upper pl...	02/17/1976

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