Sound display apparatus having separation control
Patent 4394656 Issued on July 19, 1983. Estimated Expiration Date: 
September 24, 2001. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
September 24, 2001. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesAudio signal quality indicator Signal-to-noise ratio measurement of intermittent signals Disco lamp controller for coin-operated phonograph Threshold selection circuit Patent #: 4268863 InventorApplicationNo. 06/305293 filed on 09/24/1981US Classes:340/825.73, Plural frequencies84/464RProducing color or light effectsExaminersPrimary: Yusko, Donald J.Attorney, Agent or FirmInternational ClassesH04R 3/14 (20060101)H04R 3/12 (20060101) A63J 17/00 (20060101) AbstractApparatus for displaying the frequency spectrum of an audio signal. Multiple filters (20, 24, 25) are employed to divide an audio signal into signals each having a distinct frequency spectrum. The individual signals are combined to provide a composite reference signal. Individual comparators (26, 27, 28) compare each signal with the reference signal and individual light circuits are turned on and off in response thereto. A separation control (32) is provided to alter the magnitude of the reference voltage whereby a variation in separation between lights is achieved.Field of SearchPlural frequencies | |
