Apparatus and method for receiving audio signals transmitted as part of a television video signal
Patent 4665431 Issued on May 12, 1987. Estimated Expiration Date: 
May 12, 2004. 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.
May 12, 2004. 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 ReferencesColor television signal including auxiliary information Solid state digital audio scrambler system for teletransmission of audio intelligence through a television system Signal processing circuit for video signal with buried audio signal Transmission system using differential pulse code modulation Signal recording and/or reproducing technique Patent #: 4442461 InventorApplicationNo. 06/408470 filed on 08/16/1982US Classes:348/480, Sound signal348/473Including additional informationExaminersPrimary: Groody, James J.Assistant: Parker, Michael D. Attorney, Agent or FirmInternational ClassesH04N 7/088 (20060101)H04N 7/087 (20060101) H04N 7/085 (20060101) H04N 7/084 (20060101) AbstractThe apparatus and method for receiving one or more audio frequency signals transmitted on a television video signal includes a decoder comprised of a pulse separator to recover modulated pulses from said video signal and a demodulator to demodulate said modulated pulses from said separator to recover said audio signal. Also included is an encoding apparatus and method for encoding modulated pulses responsive to audio signals on a video signal.Other References
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