High speed telemetry system using transmission medium as a component of a telemetry link

• US 6,301,504 B1
• Filed: 10/08/1999
• Issued: 10/09/2001
• Est. Priority Date: 10/08/1999
• Status: Expired due to Fees

• Current Assignee: Pacesetter Incorporated (Abbott Laboratories Incorporated)
• Original Assignee: Pacesetter Incorporated (Abbott Laboratories Incorporated)
• Inventors: Silvian, Sergiu
• Primary Examiner(s): Getzow, Scott M.
• Application Number:
  US09/415,480
• Time in Patent Office: 732 Days
• Field of Search: 607/9, 607/60, 607/32, 128/903, 455/95, 455/296, 455/899
• US Class Current: 607/60
• CPC Class Codes: A61N 1/37223 Circuits for electromagnetic coupling

Abstract

The telemetry system allows a high speed transfer of digital data at for example 81,920 KHz, by utilizing the titanium can as a component of a telemetry link. The telemetry system includes a transmitter and a receiver that are interconnected by means of the telemetry link. Input data is fed to the transmitter where it is encoded, modulated, and transmitted through the can to the receiver. The can introduces a desired low pass filtering function that complements the signal encoding and modulation process implemented by the transmitter. The transmitter processes a binary data signal provided in Non-Return-to-Zero (NRZ) format. By a series of transformations, the transmitter produces a signal whose spectral properties closely match the telemetry link, including the titanium can. The titanium can becomes a source of controlled inter-symbol-interference (ISI) to be compensated for in the receiver.

Claims

1. An implantable device for transmitting binary data to a receiver, comprising:

a transmitter housed at least in part within a housing;

the transmitter encoding, modulating, and transmitting the binary data to the receiver over a telemetry link;

the telemetry link including a housing section that introduces a low pass filtering function as part of the binary data encoding to implement a partial response signaling link.

2. The implantable device as recited in claim 1, wherein the housing includes a titanium can.

3. The implantable device as recited in claim 1, wherein the partial response signaling function employed by the transmitter, includes a (1−

D²) function, where ‘

D’

is a delay operator that represents one bit time.

4. The implantable device as recited in claim 3, wherein the (1−

D²) function is obtained by multiplying an input data signal by a (1−

D) function and a (1+D) function in succession.

5. The implantable device as recited in claim 4, wherein the transmitter includes a modulator;

and

wherein the (1−

D) function is provided by the modulator.

6. The implantable device as recited in claim 5, wherein the (1+D) function is provided by the housing section.

7. The implantable device as recited in claim 6, wherein the transmitter includes a transmit coil.

8. The implantable device as recited in claim 6, wherein the binary data signal is provided in a Non-Return-to-Zero (NRZ) format.

9. The implantable device as recited in claim 6, wherein the transmitter includes an encoder;

and

wherein the encoder divides the binary data by (1−

D²).

10. The implantable device as recited in claim 6, wherein the transmitter operates in a high data rate mode and in a low data rate mode.

11. A telemetry system for transmitting binary data, comprising:

a transmitter housed at least in part within a housing;

the transmitter encoding, modulating, and transmitting the binary data to a receiver over a telemetry link;

the telemetry link including a housing section that introduces a low pass filtering function for encoding the binary data; and

the transmitter employing a partial response signaling function which is combined with the low pass filtering function of the housing section, to implement a telemetry link.

12. The telemetry system as recited in claim 11, wherein the housing includes a titanium can.

13. The telemetry system as recited in claim 11, wherein the partial response signaling function employed by the transmitter, includes a (1−

D²) function, where ‘

D’

is a delay operator that represents one bit time.

14. The telemetry system as recited in claim 13, wherein the (1−

D²) function is obtained by multiplying an input data signal by a (1−

D) function and a (1+D) function in succession.

15. The telemetry system as recited in claim 14, wherein the transmitter includes a modulator;

and

wherein the (1−

D) function is provided by the modulator.

16. The telemetry system as recited in claim 15, wherein the (1+D) function is provided by the housing section.

17. The telemetry system as recited in claim 16, wherein the transmitter includes a transmit coil;

wherein the binary data signal is provided in a Non-Return-to-Zero (NRZ) format;

wherein the transmitter includes an encoder; and

wherein the encoder divides the binary data by (1−

D²).

18. A method for transmitting binary data from a transmitter housing at least in part within a housing, to a receiver, the method comprising:

encoding, modulating, and transmitting the binary data to the receiver over a telemetry link;

using the housing, introducing a low pass filtering function for encoding the binary data; and

employing a partial response signaling function which is combined with the low pass filtering function of the housing, to implement a telemetry link.

19. The method as recited in claim 18, wherein using the housing includes using a titanium can.

20. The method as recited in claim 18, wherein employing the partial response signaling function by the transmitter, includes employing a (1−

D²) function, where ‘

D’

is a delay operator that represents one bit time.

21. The method as recited in claim 20, wherein employing the (1−

D²) function includes multiplying an input data signal by a (1−

D) function and a (1+D) function in succession.

22. The method as recited in claim 21, wherein a modulator provides the (1−

D) function;

wherein the housing provides the (1+D) function.

23. The method as recited in claim 22, further including dividing the binary data by (1−

D²).