SIGNAL TRANSMISSION AND RECEIVING SYSTEM

• US 3,587,100 A
• Filed: 08/15/1968
• Issued: 06/22/1971
• Est. Priority Date: 08/15/1968
• Status: Expired due to Term

• Current Assignee: Edgar J. Evans, Jan H. Helbers, William Doremus
• Original Assignee: Edgar J. Evans, Jan H. Helbers, William Doremus
• Inventors: Doremus, William, Evans, Edgar J., Helbers, Jan H.
• Application Number:
  US04/753,002
• Time in Patent Office: 1,041 Days
• US Class Current: 463/6
• CPC Class Codes: A63H 30/04 using wireless transmission

Abstract

A signal transmission system including means to modulate a carrier in accordance with signals, modulated carrier transmission means, means to multiplex a plurality of carriers, means to selectively receive and demodulate a chosen carrier to provide the signals, and means to select for utilization only predetermined ones of said signals.

Claims

1. In a remote control system for controlling a plurality of independent functions for at least one remotely disposed device, a. a plurality of independent control means to provide a signal to vary proportionately the operation of each respective remote function on said device associated with a given one of said plurality of independent control means, b. signal formulation and encoding means including, means generating at least one carrier frequency, means for generating a train of nonuniformly spaced pulses each proportioned to a setting of a respective one of said plurality of control means, and means to modulate each carrier frequency with said train of nonuniformly spaced pulses and to convert said train of nonuniformly spaced pulses from parallel to serial form, c. means to transmit each modulated carrier frequency by radiating means at a prescribed level of field intensity, d. means to substantially confine and automatically control the effective field strength of each transmitted carrier frequency, e. at least one of said remote devices having a first means to selectively receive and demodulate the carrier frequency associated with said remote device, f. at least one other remote device having a second means to selectively receive and demodulate the carrier frequency associated with said other remote device, g. first means cooperatively associated with said first receiver and demodulation means to receive said serial form of nonuniformly spaced pulses and provide in time coincidence said nonuniformly spaced pulses to parallel outputs thereon, i. an independent plurality of signal selection means each selectively connectable to the parallel outputs on the respective first means and second means to permit each of said signal selection means to select a predetermined on of said nonuniformly spaced pulses for utilization to actuate means for performing the h. second means cooperatively associated with said second receiver and demodulation means to receive said serial form of nonuniformly spaced pulses and provide in time coincidence said nonuniformly spaced pulses to parallel outputs thereon, function associated with said one of the plurality of control means determining the duration of said predetermined nonuniformly spaced pulses selected.

2. In a remote control system as claimed in claim 1 wHerein said signal formulation and encoding means comprises a plurality of timing means and means to convert each one of said plurality of timing means to an associated one of said plurality of control means to continuously vary the operation of said timing device whereby said timing means will provide a pulse spaced proportional in duration to the setting of the association control means.

3. In a remote control system as claimed in claim 1 wherein said plurality of timing means comprises monostable multivibrators, and the control means in circuit with an associate multivibrator includes variable resistance means to provide for adjusting the operation of the associate one of the monostable vibrators.

4. In a remote control system as claimed in claim 1 wherein said first and second means to receive said serial form of nonuniformly spaced pulses and provide the same to parallel outputs such respectively include shift register means having a single input and parallel outputs.

5. In a remote control system as claimed in claim 1 wherein the total number of shift register parallel outputs are equal to the number of control means in said system.

6. In a remote control system as claimed in claim 5 wherein the independent signal selection means each include switch means selectively connectable to at least one of said parallel outputs on a shift register means.

7. In a remote control system as claimed in claim 5 wherein the means to modulate each carrier frequency comprises gate means to generate the carrier frequency and an input connected to the means to generating the train of nonuniformly spaced pulses.

8. In a remote control system as claimed in claim 1 wherein the respective means to selectively receive and demodulate the carrier frequency associated with the remote devices comprises adjustable frequency selective circuit means tuned to the carrier frequency, and demodulation means to strip the nonuniformly spaced pulses from said carrier frequency to provide the same in serial form.

9. In a remote control system as claimed in claim 8 wherein the respective means to selectively receive and demodulate the carrier frequency associated with the remote devices comprises an amplifier means cooperatively associated with each adjustable frequency selective circuit means, and automatic gain control means cooperatively associated with each amplifier means and operative to prevent amplification of each carrier frequency to more than the predetermined field strength of said frequency selective circuit.

10. In a remote control system as claimed in claim 8, wherein;

said means to transmit the modulated carrier frequency comprises a loop type antenna, and radiated field strength sensing and control means cooperatively with said loop antenna to substantially confine and automatically control the effective field strength of the modulated carrier frequency to within the confines of said loop antenna means at a prescribed level of intensity.

11. In a remote control system for the control of a plurality of toys in the nature of racing cars on a model racing car track wherein each of said model racing cars has a plurality of independent functions to be operated thereon. a. a plurality of independent control means remote from said cars operable to provide a signal to vary proportionately the operation of each respective remote function on said cars associated with a given one of said plurality of independent control means, b. signal formulation and encoding means including means to generate at least one carrier frequency, means for generating a train of nonuniformly spaced pulses each proportional to a setting of a respective one of said plurality of control means, and means to modulate each carrier frequency with said train of nonuniformly spaced pulses and to convert said train of nonuniformly spaced pulses from parallel to serial form, c. means to transmit each modulated carrier frequency by radiating means at a prescribed level of field intensity in the Form of a loop antenna means adjacent the periphery of said model car racing track, d. radiated field strength sensing and control means cooperatively associated with said loop antenna means to substantially confine and automatically control the effective field strength of each modulated carrier frequency to within the confines of said model car racing track of a prescribed level of intensity, e. at least two of said model racing cars having means to selectively receive and demodulate the carrier frequency to provide said nonuniformly spaced pulses in serial form. g. at least one signal selection means in one of said at least two model racing cars operative to select at least one of said nonuniformly spaced pulses for continuously variable operation of one of the functions of said model racing car, h. at least one other signal selection means in at least one of said at least two different model racing cars operative to select at least a predetermined different one of said uniformly spaced pulses for continuously variable operation of one of the functions of the associated model racing car, i. said signal selection means in each of said model racing cars operatively associated with the means to selectively receive and demodulate the carrier frequency in the model racing car whereby the operation of the function will be proportional to that of the signal of the associated control means.