Simultaneous audio and video transmission with restricted bandwidth
Patent 4849811 Issued on July 18, 1989. Estimated Expiration Date: 
July 6, 2008. 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 6, 2008. 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 3824347 3851095 3873771 3875339 Television receiver with two-way telephone conversation capability Television receiver with two-way telephone conversation and dial-out capabilities Method and means for interactive audio and video conferencing Combined wired broadcasting and viewphone system Conversational video system Freeze-picture transmission apparatus InventorApplicationNo. 07/215733 filed on 07/06/1988US Classes:375/240.01, Television or motion video signal370/490, Combined communication of diverse information types379/908, MULTIMEDIA379/93.08, Transmission scheme (e.g., compression/decompression, transmission rate)379/93.17Having station displayExaminersPrimary: Britton, Howard W.Attorney, Agent or FirmInternational ClassH04N 7/26 (20060101)AbstractMethod for simultaneously sending audio and video signals over standard telephone lines or other channels having a restricted bandwidth which comprises obtaining a video image, digitizing the image, modulating a signal with the digitized image, obtaining audio signals and filtering the audio signals to a frequency range of the band outside that of the modulated video signal, combining the filtered audio signals and the video signal, and transmitting such signals through the restricted bandwidth channel, together with a method for receiving such signals and apparatus for sending and receiving such signals. | |
