Telemetry system with phase-locking noise suppressing receiver
December 21, 2018. 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 ReferencesHigh speed digital telemetry system for implantable device Sample-and-hold digital phase-locked loop for ask signals High speed reflected impedance telemetry system for implantable medical device Heart pacing pulse detection system Telemetry receiver for implantable device, incorporating digital signal processing Method and apparatus for telemetering data bidirectionally between two devices, one device incorporating a coarse phase adjustment and the other device incorporating a fine phase adjustment High speed multilevel symbol telemetry system for cardiac pacemakers Implantable device telemetry system and method Patent #: 5999857 InventorsApplicationNo. 217127 filed on 12/21/1998US Classes:340/870.25, Phase variation128/903, RADIO TELEMETRY375/340, Particular pulse demodulator or detector607/32Communicating with pacer (e.g., telemetry)ExaminersPrimary: Horabik, MichaelAssistant: Edwards, Timothy Jr. Attorney, Agent or FirmInternational ClassG08C 019/16AbstractThere is provided a telemetry system with a receiver which enables detection of pulsed high frequency data (hf) signals in a manner which suppresses noise which may be present within the high frequency bandwidth. The transmitter carrier, which may be subject to some instability, is encoded at a symbol rate which is generated at a lower frequency than the hf, but which is reliably stable. The receiver detects the phase of each received hf pulse, and generates a phase-locked signal which is synchronized to the transmitter symbol signal. The phase-locked signal in turn is used to demodulate the received pulsed signals. In a specific DSP embodiment, the phase-lock loop has a numerically controlled oscillator which has a center frequency which corresponds to the aliased phase difference between the hf carrier phase and the phase of each pulse, thereby obtaining a signal which carries information as to the exact symbol rate. This information is used either to calculate the timing of a narrow window which gates a pulse detector coincident with each next expected symbol time, or to trigger generation of a replica signal which is used in the detect circuit, thereby providing high resolution detection of the pulses and good noise rejection.Other References
Field of SearchPhase variationRemotely changing, (e.g., programming, pacer) parameters or operation Assurance of security, accuracy, or completion of programming procedure Communicating with pacer (e.g., telemetry) Telemetry or communications circuits RADIO TELEMETRY Carrier recovery circuit or carrier tracking Particular pulse demodulator or detector Phase displacement, slip or jitter correction Phase locked loop Phase locking | |
