Noise suppressor system
Patent 4135590 Issued on January 23, 1979. Estimated Expiration Date: 
July 26, 1996. 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.
July 26, 1996. 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 References 2606972 3180936 3213372 3403224 3539725 3678416 Analog signal channel equalization with signal-in-noise embodiment Patent #: 4000369 InventorApplicationNo. 05/708894 filed on 07/26/1976US Classes:381/94.3, In multiple frequency bands330/155, UNICONTROL OF COUPLING OR THE CIRCUITS ASSOCIATED THEREWITH369/134, With particular amplification characteristic or signal control circuitry (e.g., muting)369/175, Frequency dependent (e.g., separation)369/53.44, Of storage or retrieval information signal381/94.5Soft switching, muting, or noise gatingExaminersPrimary: Claffy, Kathleen H.Assistant: Kemeny, E. S. Attorney, Agent or FirmInternational ClassesH03G 3/34 (20060101)H03G 9/02 (20060101) H03G 9/00 (20060101) AbstractA noise suppressor system uses a set of parallel bandpass filters to transform an input signal into a plurality of spectral adjacent band signals. Each band signal may then be substantially attenuated (squelched) by an attenuation-control circuit when it drops below a predetermined noise threshold. All band signals are then summed to reform essentially the original but noise-suppressed signal. Features of the invention include essentially linear control-attenuation circuitry, and ganged input-output manual level controls for dynamic range matching at constant overall gain. | |
