KR100363288B1 - - Google Patents

Info

Publication number
KR100363288B1
KR100363288B1 KR10-1994-0701703A KR19940701703A KR100363288B1 KR 100363288 B1 KR100363288 B1 KR 100363288B1 KR 19940701703 A KR19940701703 A KR 19940701703A KR 100363288 B1 KR100363288 B1 KR 100363288B1
Authority
KR
South Korea
Prior art keywords
crossings
zero
modulated
signal
gate circuit
Prior art date
Application number
KR10-1994-0701703A
Other languages
Korean (ko)
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 filed Critical
Application granted granted Critical
Publication of KR100363288B1 publication Critical patent/KR100363288B1/ko

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'').
KR10-1994-0701703A 1991-11-20 1994-05-20 KR100363288B1 (en)

Applications Claiming Priority (3)

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
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

Publications (1)

Publication Number Publication Date
KR100363288B1 true KR100363288B1 (en) 2003-02-11

Family

ID=27419909

Family Applications (1)

Application Number Title Priority Date Filing Date
KR10-1994-0701703A KR100363288B1 (en) 1991-11-20 1994-05-20

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)

Cited By (1)

* 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

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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

Cited By (1)

* 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

Also Published As

Publication number Publication date
JPH08500942A (en) 1996-01-30
WO1993010596A1 (en) 1993-05-27
CA2124114A1 (en) 1993-05-27
CA2124114C (en) 1999-03-30
EP0613595A1 (en) 1994-09-07
EP0613595A4 (en) 1995-01-18

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Legal Events

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A201 Request for examination
E902 Notification of reason for refusal
E902 Notification of reason for refusal
E902 Notification of reason for refusal
E701 Decision to grant or registration of patent right
GRNT Written decision to grant
LAPS Lapse due to unpaid annual fee