CA2124114A1 - Digital Demodulator - Google Patents

Digital Demodulator

Info

Publication number
CA2124114A1
CA2124114A1 CA 2124114 CA2124114A CA2124114A1 CA 2124114 A1 CA2124114 A1 CA 2124114A1 CA 2124114 CA2124114 CA 2124114 CA 2124114 A CA2124114 A CA 2124114A CA 2124114 A1 CA2124114 A1 CA 2124114A1
Authority
CA
Canada
Prior art keywords
crossings
zero
modulated
signal
gate circuit
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CA 2124114
Other languages
French (fr)
Other versions
CA2124114C (en
Inventor
Mark D. Hedstrom
Robert B. Porter
Charles R. Crego
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NUMA TECHNOLOGIES Inc
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from US07/794,150 external-priority patent/US5159281A/en
Priority claimed from US07/875,848 external-priority patent/US5272448A/en
Priority claimed from US07/900,367 external-priority patent/US5239273A/en
Application filed by Individual filed Critical Individual
Publication of CA2124114A1 publication Critical patent/CA2124114A1/en
Application granted granted Critical
Publication of CA2124114C publication Critical patent/CA2124114C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
    • H03D3/00—Demodulation of angle-, frequency- or phase- modulated oscillations
    • H03D3/02—Demodulation of angle-, frequency- or phase- modulated oscillations by detecting phase difference between two signals obtained from input signal
    • H03D3/04—Demodulation of angle-, frequency- or phase- modulated oscillations by detecting phase difference between two signals obtained from input signal by counting or integrating cycles of oscillations
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K9/00—Demodulating pulses which have been modulated with a continuously-variable signal
    • H03K9/06—Demodulating pulses which have been modulated with a continuously-variable signal of frequency- or rate-modulated pulses
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K9/00—Demodulating pulses which have been modulated with a continuously-variable signal
    • H03K9/08—Demodulating pulses which have been modulated with a continuously-variable signal of duration- or width-mudulated pulses or of duty-cycle modulated pulses

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
  • Measuring Frequencies, Analyzing Spectra (AREA)

Abstract

A digital demodulator for frequency modulated, pulse-width modulated and other temporally modulated signals uses a sign detector (14) to determine zero-crossings of the modulated signal. The periods between zero-crossings are determined by at least one gate circuit (16, 18) and at least one counter (22, 24) which counts clock pulses from a high-speed clock (20) gated by the gate circuit in response to zero-crossings. The period information is converted to a demodulated signal by a numerical processor (12), or a signal processor (12') or a digital-to-analog converter (12'').
CA 2124114 1991-11-20 1992-11-17 Digital demodulator Expired - Fee Related CA2124114C (en)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
US07/794,150 US5159281A (en) 1991-11-20 1991-11-20 Digital demodulator using numerical processor to evaluate period measurements
US794,150 1991-11-20
US875,848 1992-04-29
US07/875,848 US5272448A (en) 1991-11-20 1992-04-29 Method and apparatus to perform digital demodulation by measuring periods between zero crossings
US07/900,367 US5239273A (en) 1991-11-20 1992-06-18 Digital demodualtor using signal processor to evaluate period measurements
US900,367 1992-06-18

Publications (2)

Publication Number Publication Date
CA2124114A1 true CA2124114A1 (en) 1993-05-27
CA2124114C CA2124114C (en) 1999-03-30

Family

ID=27419909

Family Applications (1)

Application Number Title Priority Date Filing Date
CA 2124114 Expired - Fee Related CA2124114C (en) 1991-11-20 1992-11-17 Digital demodulator

Country Status (5)

Country Link
EP (1) EP0613595A4 (en)
JP (1) JPH08500942A (en)
KR (1) KR100363288B1 (en)
CA (1) CA2124114C (en)
WO (1) WO1993010596A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101113902B1 (en) 2008-05-29 2012-03-02 에스케이텔레콤 주식회사 Apparatus and Method for Receiving Near Wireless Signal Using Digital Radio Frequency Processing and Zero Crossing
JP6212256B2 (en) * 2012-12-25 2017-10-11 ダイヤモンド電機株式会社 AD conversion processor

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3548328A (en) * 1969-01-13 1970-12-15 Honeywell Inc Digital fm discriminator
US4412339A (en) * 1981-09-24 1983-10-25 Advanced Micro Devices, Inc. Zero-crossing interpolator to reduce isochronous distortion in a digital FSK modem
DE3223345A1 (en) * 1982-06-23 1984-01-05 Philips Patentverwaltung Gmbh, 2000 Hamburg METHOD AND ARRANGEMENT FOR DEMODULATING A FREQUENCY-MODULATED INPUT SIGNAL
US4596022A (en) * 1983-08-25 1986-06-17 The Microperipheral Corporation FSK data communication system
EP0146652B1 (en) * 1983-12-24 1987-09-02 Deutsche ITT Industries GmbH A digital demodulator for digitized frequency-modulated signals
EP0210292B1 (en) * 1985-07-27 1990-09-26 Deutsche ITT Industries GmbH Frequency demodulation circuit with zero-crossing counter
US4992748A (en) * 1989-09-13 1991-02-12 Atlantic Richfield Company Period-inverting FM demodulator

Also Published As

Publication number Publication date
WO1993010596A1 (en) 1993-05-27
JPH08500942A (en) 1996-01-30
EP0613595A1 (en) 1994-09-07
CA2124114C (en) 1999-03-30
EP0613595A4 (en) 1995-01-18
KR100363288B1 (en) 2003-02-11

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Legal Events

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