CA2124114A1 - Digital Demodulator - Google Patents
Digital DemodulatorInfo
- 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
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'').
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)
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)
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 |
-
1992
- 1992-11-17 JP JP5509448A patent/JPH08500942A/en active Pending
- 1992-11-17 CA CA 2124114 patent/CA2124114C/en not_active Expired - Fee Related
- 1992-11-17 EP EP92924443A patent/EP0613595A4/en not_active Withdrawn
- 1992-11-17 WO PCT/US1992/009857 patent/WO1993010596A1/en not_active Application Discontinuation
-
1994
- 1994-05-20 KR KR10-1994-0701703A patent/KR100363288B1/ko not_active IP Right Cessation
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
Date | Code | Title | Description |
---|---|---|---|
EEER | Examination request | ||
MKLA | Lapsed |