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Telemetry gain adjustment algorithm and signal strength indication in a noisy environment

  • US 5,107,833 A
  • Filed: 11/02/1990
  • Issued: 04/28/1992
  • Est. Priority Date: 11/02/1990
  • Status: Expired due to Term
First Claim
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1. In a software-controlled, external programmer for programming by downlink telemetry and receiving by uplink telemetry, data to and from an implanted medical device, the improved method for automatically optimizing gain level to minimize interference in the presence of noise in the uplink telemetry mode, comprising the steps of:

  • providing in said programmer an adjustable gain amplifier dependent upon a gain control input signal gain value for amplifying uplink telemetry radio frequency signals;

    detecting uplink telemetry signals amplified by said amplifier which match detect criteria;

    setting the gain control input signal applied to said amplifier to a minimum gain value;

    starting a first time interval upon setting the gain value;

    incrementing said gain value by a predetermined gain factor if no telemetry signal is detected within said first time interval;

    comparing said incremented gain value to a maximum gain value and resetting said gain value to said minimum gain value each time said incremented gain value reaches said maximum gain value;

    restarting said first time interval when an amplified signal is detected;

    measuring the time interval between successive detected uplink telemetry signals and comparing said time interval to first and second formatted data intervals;

    incrementing said gain value by said predetermined factor when the measured interval between successive telemetry signals exceeds both formatted data intervals; and

    decrementing said gain value by a decrement gain value factor whenever said interval between successive telemetry signals is less than but not equal to said first and second formatted intervals, whereby said gain value linearly increases and decreases as a function of the interval between telemetry signals.

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