Remote response system and data transfer protocol
Patent 5724357 Issued on March 3, 1998. Estimated Expiration Date: 
March 3, 2015. 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.
March 3, 2015. 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.Patent ReferencesInventorAssigneeApplicationNo. 265843 filed on 06/24/1994US Classes:370/313, Portable address responsive receiver340/7.23, Including reply to query340/7.46, Group call340/10.32, Group call341/182, With variable pulse length370/312, Message addressed to multiple destinations370/349, Using messages having an address field as header375/238, PULSE WIDTH MODULATION434/351Wireless signalsExaminersPrimary: Kizou, HassanAttorney, Agent or FirmForeign Patent References
International ClassesH04J 003/26H03K 007/08 AbstractA wireless remote response system includes a base unit which retrieves user-entered responses from a plurality of remote response units, each of which is provided to a user. The base unit transmits a base data package over a wireless communication link to the plurality of remote response units, which decode the base packet and load into memory a portion of the decoded base package at each response unit. Each response unit examines the characters loaded into the memory and determines any character in the portion of the decoded base package that pertains to that particular response unit. Each remote response unit then processes any character that pertains to that particular response unit. Each bit of data exchanged between the base unit and the response unit is encoded as a particular time interval for at least one cycle of a periodic waveform by varying the time interval either between successive rising edges or between successive falling edges of the periodic waveform. Decoding is carried out by measuring the time intervals between rising edges or between falling edges of successive waveforms. It is then determined whether each measured time interval falls within one of at least two distinct non-overlapping time ranges in order to determine a value of each bit.Other References
Field of SearchPulse width and pulse position modulationPULSE WIDTH (PULSE DURATION) MODULATION Message addressed to multiple destinations Portable address responsive receiver Using time division multiplexing Using messages having an address field as header Messages addressed to multiple destinations Polling PULSE WIDTH MODULATION PULSE POSITION, FREQUENCY, OR SPACING MODULATION SYSTEMS USING ALTERNATING OR PULSATING CURRENT Minimum shift keying One cycle or less per bit To or from packed format With variable pulse spacing or grouping With variable pulse length QUESTION OR PROBLEM ELICITING RESPONSE Response of plural examinees communicated to monitor or recorder by electrical signals Wireless signals With means for indicating first examinee to respond Correctness of response indicated to examine by self-operating or examinee actuated means Response of plural examinees communicated to monitor or recorder by electrical signals Answer-back Interrogator-responder Addressing Pulse responsive actuation Pulse width Pulse spacing (e.g., pulse repetition rate) Answer back | |
