Synchronous telemetry receiver and receiving method for an implantable medical device
First Claim
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1. A synchronous telemetry receiver for an implantable medical device, comprising:
- means for receiving a PPM signal from said implantable medical device, said PPM signal including a plurality of bits each having a sync pulse and at least one data pulse of equal amplitude, said plurality of bits including first, second, third and fourth pulses; and
means for measuring the time interval between each data pulse and its respective sync pulse, said measuring means including means for distinguishing between equal-amplitude sync pulses and data pulses.
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Abstract
A synchronous telemetry receiver and receiving method for reception from an implantable medical device of a PPM signal including a plurality of bits each having a sync pulse and at least one data pulse of equal amplitude. Capability is provided for restoring correct phase in the event that a sync pulse is missing or incorrectly received for any reason. A high-frequency clock and counter are provided for counting clock pulses during the time interval between each data pulse and its respective sync pulse in order to obtain a measurement of the time interval.
191 Citations
9 Claims
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1. A synchronous telemetry receiver for an implantable medical device, comprising:
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means for receiving a PPM signal from said implantable medical device, said PPM signal including a plurality of bits each having a sync pulse and at least one data pulse of equal amplitude, said plurality of bits including first, second, third and fourth pulses; and means for measuring the time interval between each data pulse and its respective sync pulse, said measuring means including means for distinguishing between equal-amplitude sync pulses and data pulses. - View Dependent Claims (2, 3, 4, 5)
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6. A synchronous method of receiving telemetry information from an implantable medical device, comprising the steps:
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receiving a PPM signal from said implantable medical device, said PPM signal including a plurality of bits each having a sync pulse and at least one data pulse of equal amplitude, said plurality of bits including first, second, third and fourth pulses; and measuring the time interval between each data pulse and its respective sync pulse, said measuring step including distinguishing between equal-amplitude sync pulses and data pulses. - View Dependent Claims (7, 8, 9)
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Specification