FREQUENCY SHIFT TELEMETRY SYSTEM WITH BOTH RADIO AND WIRE TRANSMISSION PATHS

• US 3,603,881 A
• Filed: 03/01/1968
• Issued: 09/07/1971
• Est. Priority Date: 03/01/1968
• Status: Expired due to Term

• Current Assignee: William E. Thornton
• Original Assignee: William E. Thornton
• Inventors: Thornton, William E.
• Primary Examiner(s): Kamm, William E.
• Application Number:
  US04/709,569
• Time in Patent Office: 1,285 Days
• Field of Search: 128/2.05,2.06,2.08,2.1,2.15,2.1A 340/310,183,184,189,206 325/30,38,39,40,118
• US Class Current: 375/272
• CPC Class Codes: A61B 5/002 Monitoring the patient using a local or closed circuit, e.g. in a room or building A61B5/0017 takes precedence
• CPC Class Codes: G08C 19/28 using pulse code
• CPC Class Codes: Y10S 128/903 Radio telemetry

Abstract

A transmission system using a possibly existing wiring system for transmitting RF signals and covering short distances away from the wiring system through VHF transmission. In hospitals, physiological data are transmitted from a sensor VHF transmitter to a fixed VHF receiver RF transmitter coupled to the wiring system in the building. A RF receiver demodulator monitor is coupled to wiring system at the nurses'"'"''"'"' station. The system is particularly designed for noise suppression.

Claims

1. A system for transmission of information using a wiring system, comprising:

a first and second oscillator each providing high frequency signals of slightly differing frequencies;

first means defining a source of data and providing data signals to be transmitted, the signals having characteristics of a pulse-pause train;

second means connected to the oscillators for transmitting the high frequency signals and including means for connecting the oscillators to the source for obtaining short-range wireless transmission of the high frequency signals of the two oscillators in alternating sequence in accordance with the pulse-pause train;

third means positioned for receiving the high frequency signals as transmitted by the second means and providing a signal train in which two frequencies alternate in accordance with said pulse-pause train, the latter two frequencies being below a limit frequency for signal transmission through the wiring system;

fourth means coupling the signal train to the wiring system for transmission therethrough; and

fifth means coupled to the wiring system and being responsive to the signals of the train for providing a duplicate signal of said pulse-pause train.

2. A system as set forth in claim 1, the fifth means including a pair of narrow band tuned receivers coupled to the wiring system and respectively responsive to the two frequencies as provided by the third means.

3. A system as set forth in claim 1 wherein first means including a. means for providing information signals, and b. means coupled to the (a) means to provide a subcarrier modulated by the information signals and as a pulse-pause train.