Analog and digital telemetry system for an implantable device
First Claim
1. A system for simultaneously transmitting digital and analog information from an implanted device to an external device, said system comprising:
- frequency modulation means within said implanted device for generating a carrier signal and frequency modulating said carrier signal with analog information;
shift register means within said implanted device for holding digital data, said shift register means including means for serially clocking the digital data out of said shift register means in response to a clock signal;
means for applying said frequency modulated carrier signal from said frequency modulation means to said shift register means, said frequency modulated carrier signal comprising the clock signal that is used to serially clock the digital data out of said shift register means; and
transmitting means within said implanted device for serially transmitting to said external device the digital data clocked out of said shift register means by said frequency modulated carrier signal, whereby both said digital data and the analog information, used to modulate said frequency modulated carrier signal, are contained in the signal transmitted by said transmitting means.
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Accused Products
Abstract
In an implantable device, transmission and reception of digital information is accomplished as well as the transmission and reception of analog information. The analog signal is FM modulated for transmission and the digital signal is phase modulated for transmission. The FM modulated signal is used as a clock in the phase encoding of the digital signal and thus provides a signal simultaneously carrying analog and digital information. Means for reception of the analog and digital information is taught. The use of PSK (phase shift keying) as the phase modulation scheme for transmission and reception is also taught.
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Citations
10 Claims
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1. A system for simultaneously transmitting digital and analog information from an implanted device to an external device, said system comprising:
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frequency modulation means within said implanted device for generating a carrier signal and frequency modulating said carrier signal with analog information; shift register means within said implanted device for holding digital data, said shift register means including means for serially clocking the digital data out of said shift register means in response to a clock signal; means for applying said frequency modulated carrier signal from said frequency modulation means to said shift register means, said frequency modulated carrier signal comprising the clock signal that is used to serially clock the digital data out of said shift register means; and transmitting means within said implanted device for serially transmitting to said external device the digital data clocked out of said shift register means by said frequency modulated carrier signal, whereby both said digital data and the analog information, used to modulate said frequency modulated carrier signal, are contained in the signal transmitted by said transmitting means. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An implantable transmitting unit for selectively transmitting digital or analog data from an implantable medical device, said transmitting unit comprising:
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carrier signal generation means for generating a carrier signal; analog modulating means for modulating said carrier signal with analog data; shift register means for holding digital data; clocking means for serially shifting said digital data through said shift register means in response to a clock signal; exclusive-or gate means for receiving said clock signal and the data clocked out of said shift register means by said clocking means, and for generating a modulated signal that represents a phase shift keyed (PSK) signal of said digital data; switch means for selecting one or the other of said modulated carrier signal or said PSK signal for transmission; and transmitting means for transmitting the signal selected by said switch means. - View Dependent Claims (9, 10)
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Specification