Stereophonic bilingual signal processor
Patent 4399329 Issued on August 16, 1983. Estimated Expiration Date: 
November 25, 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.
November 25, 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 References 3795764 Color-picture/multichannel-sound record and recording/playback apparatus and methods therefor Compatible stereophonic receiver Stereophonic signal indicating apparatus Receiver for television sound multiplex broadcasting and FM stereo multiplex broadcasting FM Multiplex system for selectively delaying one of two audio signals Patent #: 4302837 InventorAssigneeApplicationNo. 06/325044 filed on 11/25/1981US Classes:370/480, Combining or distributing information via frequency channels348/485, Plural (e.g., stereo or SAP)348/738, Sound circuit369/47.16, Of plural interrelated channels369/86, STORAGE OR RETRIEVAL OF SPATIALLY RELATED ACOUSTIC SIGNALS (E.G., STEREO)381/12, Stereo indicators (e.g., stereo presence)386/97Selective mode (e.g., mono, stereo, or bilingual)ExaminersPrimary: Hickey, R. J.Attorney, Agent or FirmInternational ClassH04N 5/60 (20060101)AbstractThe format of two audio input signals, which may be of either matrixed form wherein each signal comprises two common components or of unmatrixed form wherein each signal comprises a respective independent component, is determined by applying the signals to a first network circuit which linearly combines the signals to produce a resultant audio output signal exhibiting a null condition when the input signals are of matrixed form and a non-null condition when the input signals are of unmatrixed form. A null detector responsive to the resultant signal supplies a control signal to a second decoder matrix which decodes the matrixed signals to independent form and couples the decoded signals to respective first and second output terminals when the null condition is detected and which couples the unmatrixed input signals to respective ones of the first and second output terminals when the non-null condition is detected.Other References
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