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

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

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	A61B-005/04
출원번호	US-0608492 (1990-11-02)
발명자 / 주소	Barsness Michael S. (Brooklyn Park MN)
출원인 / 주소	Medtronic, Inc. (Minneapolis MN 02)
인용정보	피인용 횟수 : 111 인용 특허 : 0

초록 ▼

A software-controlled, external programmer for transcutaneously programming and receiving data from an implanted medical device providing a real-time indication of the implanted medical device RF telemetry signal strength to the user of the device programmer while automatically optimizing gain level to minimize interference in the presence of noise. The method and apparatus involves monitoring the validity of received intervals or frames uplinked from the implanted medical device to adjust the gain of the RF amplifier in a pre-determined range. When noise is detected, indicating a relatively small signal-to-noise ratio, the automatic gain control (AGC) level is decreased, effectively tracking this condition. Similarly, lack of any signal of loss of individual RF pulses causes the AGC level to be increased.

대표청구항 ▼

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 improvement for automatically optimizing gain level to minimize interference in the presence of noise in the uplink telemetry receive mode, comprising: an adjustable gain amplifier in said programmer dependent upon a gain control input signal gain value for amplifying uplink telemetry radio frequency signals; means for detecting uplink telemetry signals amplified by said amplifier which match detect criteria; means for setting the gain control input signal applied to said amplifier to a minimum gain value; means for starting a first time interval upon setting the gain value; means for incrementing said gain value by a predetermined gain factor if no telemetry signal is detected within said first time interval; means for 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; means for restarting said first time interval when an amplified signal is detected; means for measuring the time interval between successive detected uplink telemetry signals- and comparing said time interval to first and second formatted data intervals; means for incrementing said gain value by said predetermined factor when the measured interval between successive telemetry signals exceeds both formatted data intervals; and means for 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.

이 특허를 인용한 특허 (111)

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

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

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