Short range inductively coupled communication system employing time variant modulation
March 25, 2014. 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 3660760 3742150 3898565 Wireless audio passenger entertainment system (WAPES) Cordless transmitting and receiving apparatus Cordless communications system Inductive device for the rapid exchange of data between two data carriers Induction-based assistive listening system Three wire system for Cochlear implant processor Cochlear implant employing frequency-division multiplexing and frequency modulation InventorsApplicationNo. 086823 filed on 07/02/1993US Classes:375/259, SYSTEMS USING ALTERNATING OR PULSATING CURRENT381/79, Near field381/312, HEARING AIDS, ELECTRICAL381/314, Programming interface circuitry455/41.1Near field (i.e., inductive or capacitive coupling)ExaminersPrimary: O'Shea, SandraAssistant: Ning, John Attorney, Agent or FirmForeign Patent References
International ClassesH04R 025/00H04R 005/00 H04L 027/100 H04B 005/00 AbstractA short range magnetically coupled wireless communication system employs time variant modulation of a high repetition rate pulse stream and magnetic coupling between a transmission magnetic element and a receiving magnetic element. The pulse stream is modulated by an input audio frequency signal in the time domain, for example, through pulse position modulation, pulse width modulation or pulse symmetry modulation. The receiving magnetic element is coupled to a demodulator circuit which detects the transmitted pulses induced in the receiving magnetic element and reproduces the audio frequency signal. Transmission over short range is thus efficiently accomplished through magnetic coupling in a simple, low cost, low power consumption communication system. | |
