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Method and apparatus for detecting transitions in an input signal

IPC분류정보
국가/구분 United States(US) Patent 등록
국제특허분류(IPC7판)
  • G06K-007/10
출원번호 US-0924053 (1997-08-28)
발명자 / 주소
  • Arends Thomas C.
  • Elliott Randy D.
출원인 / 주소
  • Spectra-Physics Scanning Systems, Inc.
대리인 / 주소
    Lyon & Lyon LLP
인용정보 피인용 횟수 : 29  인용 특허 : 22

초록

A method and apparatus for determining the transitions between binary levels of an input signal such as a scanned bar code label by detecting zero crossings of an approximated second derivative of the input signal. Samples of the input signal are obtained by using delay lines, sample-and-hold circui

대표청구항

[ What is claimed is:] [1.] An apparatus for determining the occurrence of transitions in an input signal comprisingan optical detector,a double differentiator connected to said optical detector, outputting an approximate second derivative of an input signal received from said optical detector,a zer

이 특허에 인용된 특허 (22)

  1. Schaham Moshe (West Hartford CT), Auto focusing bar code reader.
  2. Cloke Robert L. (Santa Clara CA), Composite gate generator circuit for detecting valid data signals.
  3. Seo Shuzo (Tokyo JPX) Mogamiya Makoto (Tokyo JPX), Data symbol reader.
  4. Eastman Jay M. (Pittsford NY), Differentiating and integrating circuit for translating bar code signals into corresponding pulses.
  5. Brosnan Michael (Fremont CA) Quan Ronald (Cupertino CA), Digital bar code slot reader with threshold comparison of the differentiated bar code signal.
  6. Barkan Edward (Miller Place NY), Digital circuit for a laser scanner using a first derivative signal and a comparison signal.
  7. Martino Raymond A. (San Jose CA), Digitizer for barcode scanner.
  8. Barkan Edward (S. Setauket NY), Digitizer signal processing circuit for a bar code.
  9. Lizzi Phillip (Deptford NJ) Shandelman Richard (Levittown PA), Electronic article surveillance system with improved differentiation.
  10. Peng Ke-Ou (Delft NLX), Focusing means for a symbol code reader.
  11. Ishikawa Hiromi (Kaisei JPX), Light beam scanner with focus-varying mechanism.
  12. Braathen Russell (Calgary CAX), Linear phase low pass filter.
  13. Coleman ; Jr. Edward P. (Fairport NY), Method and apparatus for detecting edges in a signal obtained from a bar code scanned in the Fresnel zone.
  14. Arends Thomas C. (Eugene OR) Elliott Randy D. (Eugene OR), Method and apparatus for detecting transitions in a time sampled input signal.
  15. Torrieri Don J. (3104 Cordoba St. Silver Spring MD 20904), Method and means for pulse detection.
  16. Tasaki Shinichi (Toda JPX), Optical reader with improved response to change in reflected signal.
  17. Hebert Raymond T. (Saratoga CA) Ekstrand John P. (Palo Alto CA), Signal processor method and apparatus.
  18. Aoki Kazuyo (Omiya JPX) Saeki Tomoki (Yokohama JPX), Signal transient improvement circuit.
  19. Peterson Donald S. (Philomath OR) Taussig Andrew P. (Eugene OR), Signal transition detection method and system.
  20. Kukson Dean R. (Byron MN) Melas Constantin M. (Los Gatos CA) Poss Joey M. (Rochester MN), Single stage feedforward equalizer.
  21. Barkan Edward (Miller Place NY), System for digitizing a scanned signal indicating changes in signal intensity.
  22. Rudeen Robert W. (Eugene OR), Variable focus optical system for data reading.

이 특허를 인용한 특허 (29)

  1. Lucera, Mark G.; Check, Frank; Knowles, C. Harry; Zhu, Xiaoxun, ANALOG SCAN DATA SIGNAL PROCESSOR EMPLOYING A TIME-DOMAIN SUBSTRATE NOISE FILTER FOR NON-LINEARLY PROCESSING ANALOG SCAN DATA SIGNALS AND REDUCING SUBSTRATE NOISE SIGNAL LEVELS THEREIN PRIOR TO FIRST.
  2. Gibson, Gregory T., Bar code scanner having an adaptive threshold using a first derivative amplitude.
  3. Takahashi,Kentaro, Barcode scanning system with a compensation circuit.
  4. Lina, Arnaud, Detecting a position of a sheet of light in an image.
  5. Lina, Arnaud, Detection of a sheet of light based on second derivative.
  6. He,Duanfeng; Joseph,Eugene, Digitizing bar code symbol data.
  7. Edward P. Coleman ; James E. Colley ; Patrick M. O'Donnell, Fast edge detection system tolerant of high degree of intersymbol interference.
  8. Mark Lucera ; Frank Check ; C. Harry Knowles ; Xiaoxun Zhu ; LeRoy Dickson, Laser scanning bar code symbol reader employing variable pass-band filter structures having frequency response characteristics controlled by time-measurement of laser-scanned bar code symbol.
  9. Lucera,Mark; Check,Frank; Knowles,C. Harry; Zhu,Xiaoxun; Dickson,LeRoy, Laser scanning bar code symbol reader employing variable passband filter structures having frequency response characteristics controlled by time-measurement of laser-scanned bar code symbol elements.
  10. Brown, Dean R.; Davis, Wyatt O.; Tauscher, Jason B., MEMS device having a drive coil with curved segments.
  11. Lucera, Mark G.; Check, Frank; Knowles, C. Harry; Zhu, Xiaoxun, METHOD OF AND APPARATUS FOR PROCESSING ANALOG SCAN DATA SIGNALS DERIVED BY SCANNING BAR CODE SYMBOLS USING A LASER BEAM, WHEREIN A REAL-TIME BAR CODE ELEMENT DETECTOR IS USED TO CONTROL THE DETECTION.
  12. Mark Lucera ; Frank Check ; C. Harry Knowles ; Xiaoxun Zhu, METHOD OF AND APPARATUS FOR PROCESSING ANALOG SCAN DATA SIGNALS DERIVED WHILE SCANNING A BAR CODE SYMBOL USING A LASER BEAM, WHEREIN THE DETECTED BEAM SPOT SPEED OF SAID LASER BEAM IS USED TO DYNAMIC.
  13. Lucera, Mark; Check, Frank; Knowles, C. Harry; Zhu, Xiaoxun; Dickson, LeRoy, METHOD OF AND SYSTEM FOR SCANNING BAR CODE SYMBOLS USING A LASER SCANNING PATTERN HAVING MULTIPLE FOCAL ZONES, WHEREIN THE MINIMUM BEAM DIMENSION/MINIMUM BAR WIDTH (MBD/MBW) RATIO IS GREATER THAN OR .
  14. Mark Lucera ; Frank Check ; C. Harry Knowles ; Xiaoxun Zhu ; LeRoy Dickson, MULTI-FOCAL LASER SCANNING BAR CODE SYMBOL READING SYSTEM EMPLOYING A SCAN DATA SIGNAL PROCESSOR HAVING A VARIABLE PASS-BAND FILTER STRUCTURE WITH FREQUENCY CHARACTERISTICS CONTROLLED BY DETECTING TH.
  15. Lucera, Mark; Check, Frank; Knowles, C. Harry; Zhu, Xiaoxun; Dickson, LeRoy, MULTI-FOCAL LASER SCANNING BAR CODE SYMBOL READING SYSTEM EMPLOYING A SCAN DATA SIGNAL PROCESSOR HAVING A VARIABLE PASS-BAND FILTER STRUCTURE WITH FREQUENCY CHARACTERISTICS CONTROLLED BY MEASURING TH.
  16. Lucera, Mark; Check, Frank; Knowles, C. Harry; Zhu, Xiaoxun; Dickson, LeRoy, MULTI-FOCAL LASER SCANNING BAR CODE SYMBOL READING SYSTEM EMPLOYING A VARIABLE SECOND DERIVATIVE SIGNAL PASS-BAND FILTER STRUCTURE HAVING FREQUENCY CHARACTERISTICS THAT ARE CONTROLLED IN A REAL-TIME .
  17. Madej, Dariusz, Method and system for decoding a barcode.
  18. He Duanfeng ; Joseph Eugene, Method of processing an analog electrical signal containing information representative of reflected light from coded indicia, wherein the electrical signal contains edge transitions.
  19. Lucera, Mark; Ralph, Joseph, Multipath scan data signal processor having multiple signal processing paths with different operational characteristics to enable processing of signals having increased dynamic range.
  20. Brown, Dean R.; Davis, Wyatt O.; Gibson, Gregory T.; James, Richard A., Non-resonant drive for adaptive trajectory of a scanner system having a MEMS device.
  21. Mark Lucera ; Frank Check ; C. Harry Knowles ; Xiaoxun Zhu ; LeRoy Dickson, Reading system a variable pass-band.
  22. Mark G. Lucera ; C. Harry Knowles ; Xiaoxun Zhu, SCAN DATA SIGNAL PROCESSOR EMPLOYING PASS-BAND FILTER STRUCTURES HAVING FREQUENCY RESPONSE CHARACTERISTICS DYNAMICALLY SWITCHED INTO OPERATION BY CONTROL SIGNALS INDICATIVE OF THE FOCAL ZONE OF THE L.
  23. Lucera, Mark G.; Check, Frank; Knowles, C. Harry; Zhu, Xiaoxun, Scan data signal processor employing band-pass filter having frequency response characteristics controlled by the depth of focus of the laser scanning beam.
  24. Collet, Roeland; James, Richard A.; Brown, Dean R.; Davis, Wyatt O., Scanning module for a scanner system having a MEMS device or the like.
  25. Brown, Dean R.; Davis, Wyatt O.; Tauscher, Jason B.; Bowman, David R., Suspension for maintaining mirror flatness of a MEMS device in a scanner system or the like.
  26. Thomas P. Gettys, Symbology-independent method and apparatus for identifying potential bar code data.
  27. Olmstead,Bryan L., System and method for determining a threshold for edge detection based on an undifferentiated equalized scan line signal.
  28. Gibson, Gregory T.; James, Richard A.; Davis, Wyatt O., System for determining an operational state of a MEMS based display.
  29. Gibson, Gregory T.; James, Richard A.; Davis, Wyatt O., System for determining an operational state of a MEMS based laser scanner.
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