Fast scan trainable transmitter

Patent 5854593 Issued on December 29, 1998. Estimated Expiration Date:

July 26, 2016. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Abstract Claims Description Full Text

Patent References

3337992

Circuit arrangement for selective frequency analysis of the amplitudes of one or more signals
Patent #: 4074200
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Inventors

Assignee

Prince Corporation

Application

No. 688820 filed on 07/26/1996

US Classes:

340/825.22, Program control340/5.25, Programming of coded record340/5.61, Wireless transceiver340/825.69Radio link

Examiners

Primary: Holloway, III, Edwin C.

Attorney, Agent or Firm

Price, Heneveld, Cooper, DeWitt & Littton

Foreign Patent References

1261150 IT. 12/18/1993
9402920 WO. 02/18/1994

International Class

H04Q 007/00

Abstract

A trainable transmitter for learning the characteristics of a received RF signal and for transmitting a coded RF signal having the learned characteristics to a receiver for remote activation of a device, such as a garage door opener. The trainable transmitter includes a tunable RF circuit and a controller coupled to the RF circuit for selectively tuning the RF circuit during a training sequence. To provide a user with an early indication that a valid RF signal is being received at the initiation of the training sequence, the control circuit quickly sweeps the frequency at which the RF circuit is tuned from the lowest frequency to the highest frequency of a frequency range in which the carrier frequency of a valid RF signal would fall. If a signal is not detected during this initial fast scanning procedure, the training sequence is terminated and the user is so informed.

Other References

Kari, Risto, "Fast Training of a High-Speed Voiceband Data Modem Receiver," Doctoral Dissertation, Helinski, 1990, pp. 21, 83-99
Madni, Asad M. et al., "High-Dynamic-Range Airborne Tracking and Fire Control Radar Subsystems," IEEE, vol. 37, No. 12, Dec. 1989, pp. 1942-1948
Foltz, Capt. Thomas M. et al., "A Digital Single Sideband Modulator for Digital Radio Frequency Memory," pp. 926-932
Ooi, T. H. et al., "Low Cost RF Indentification and Locating System," IEEE, vol. 35, No. 4, Nov. 1989, pp. 831-839
Vaccani, Paul, "Occupancy Measurement Methods in the Radio Frequency Spectrum and Their Use, " pp. 242-246
Herman, Ray A. et al., "A GPS Receiver With Synthesized Local Oscillator," IEEE, 1989, pp. 194-195, 339
Marino, Gail, "Pager and Garage Door Opener Combination," Motorola Technical Developments, vol. 10, Mar. 199