AI Patent Summary

Patent Document
#US6700931B1
United States Patent
Abstract
Aradio frequency identification (RFID) tag device having a pulse position modulation (PPM) decoder circuit which calculates a relative frequency relationship between an inter- nal clock-oscillator of the RFID tag device and an external PPM source such as a RFID tag reader, and then synchro- nizes the RFID tag device PPM decoder circuit to the required precision for reliable PPM symbol decoding. The PPM decoder is synchronized by measuring the “counts per pulse” (CPP) from a calibration cycle having a plurality of pulses in a single symbol frame. 23 Claims, 5 Drawing Sheets 128 CLK 226d Q& Modulo 16 Q, Counter Q, Q 226c To Symbol 226b Register 130 226 (Modulo-16 Pulse Position) Set at rising edge of last calibration symbol pulse
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Patent Classification & AI Product Mapping
Authoritative patent classification definitions mapped to real-world technology domains and commercial product categories.
CPC H04L25/00
Confidence: High
Official Definition
Baseband systems
ELECTRICITY > ELECTRIC COMMUNICATION TECHNIQUE > TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
AI Technology & Product Mapping
Technology Domain:
Digital Communications & Baseband Processing
Product Category:
RFID Transceivers & Baseband Processors
Plain-English Summary:
General systems and methods for transmitting and receiving digital or analog data signals directly over a communication channel without using a high-frequency carrier wave modulation.
Relation to Claims:
The RFID tag processes raw digital baseband pulses for decoding pulse position modulation (PPM) directly within the tag circuitry.
CPC H04L25/38
Confidence: High
Official Definition
Synchronous or start-stop systems, e.g. for Baudot code
ELECTRICITY > ELECTRIC COMMUNICATION TECHNIQUE > TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
AI Technology & Product Mapping
Technology Domain:
Digital Communications & Timing Synchronization
Product Category:
RFID Tags & Synchronous Communication Modules
Plain-English Summary:
Communication systems that rely on timing synchronization between the transmitter and receiver to correctly interpret data symbols.
Relation to Claims:
Directly applies to the invention's primary mechanism of synchronizing the internal clock-oscillator of the RFID tag with an external reader using calibration cycles.
CPC H04L25/40
Confidence: High
Official Definition
Transmitting circuits; Receiving circuits
ELECTRICITY > ELECTRIC COMMUNICATION TECHNIQUE > TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
AI Technology & Product Mapping
Technology Domain:
Analog & Mixed-Signal Circuit Design
Product Category:
RFID Integrated Circuits (ICs)
Plain-English Summary:
Hardware circuits and electronic components specifically designed to send or receive baseband communication signals.
Relation to Claims:
Covers the physical receiving circuitry of the RFID tag device that handles incoming radio frequency identification signals.
CPC H04L25/49
Confidence: Medium
Official Definition
Transmitting circuits; Receiving circuits using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels ; Baseband coding techniques specific to data transmission systems
ELECTRICITY > ELECTRIC COMMUNICATION TECHNIQUE > TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
AI Technology & Product Mapping
Technology Domain:
Data Encoding & Baseband Modulation
Product Category:
Communication Modems & RFID Decoders
Plain-English Summary:
Specialized transceiver circuits that utilize specific baseband coding techniques or pulse format conversions during transmission and reception.
Relation to Claims:
Relates to the internal decoding circuitry that converts specific symbol formats and pulse arrangements into digital register values.
CPC H04L25/4902
Confidence: High
Official Definition
Pulse width modulation; Pulse position modulation
ELECTRICITY > ELECTRIC COMMUNICATION TECHNIQUE > TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
AI Technology & Product Mapping
Technology Domain:
Pulse Position Modulation (PPM) Architectures
Product Category:
RFID Tag Decoders & PPM Communication ICs
Plain-English Summary:
Communication circuits and methods specifically adapted for encoding or decoding data by varying the width or position of pulses in a signal.
Relation to Claims:
This is the exact specific classification for the patent's core innovation: a pulse position modulation (PPM) decoder circuit utilizing 'counts per pulse' (CPP) for symbol decoding.