CA2440294A1 - Frequency verification of an amplitude modulated signal - Google Patents

Frequency verification of an amplitude modulated signal Download PDF

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Publication number
CA2440294A1
CA2440294A1 CA002440294A CA2440294A CA2440294A1 CA 2440294 A1 CA2440294 A1 CA 2440294A1 CA 002440294 A CA002440294 A CA 002440294A CA 2440294 A CA2440294 A CA 2440294A CA 2440294 A1 CA2440294 A1 CA 2440294A1
Authority
CA
Canada
Prior art keywords
frequency
counter
modulated signal
amplitude modulated
carrier signal
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
CA002440294A
Other languages
French (fr)
Other versions
CA2440294C (en
Inventor
Gavin Martin Monson
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.)
Harris Corp
Original Assignee
Harris Corp
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
Application filed by Harris Corp filed Critical Harris Corp
Publication of CA2440294A1 publication Critical patent/CA2440294A1/en
Application granted granted Critical
Publication of CA2440294C publication Critical patent/CA2440294C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
    • H04H20/12—Arrangements for observation, testing or troubleshooting

Abstract

An apparatus and method are disclosed for verifying the frequency of an AM carrier signal having a target frequency. The apparatus includes a high frequency clock that produces a clock signal having a higher frequency than the target frequency. A counter is advanced by the clock signal and reset after each cycle of the carrier signal. A first comparison portion compares the value recorded by the counter to a first reference value, and a second comparison portion compares the value recorded by the counter to a second reference value. An error determination portion attenuates the carrier signal if the comparisons conducted by the first and second comparison portions indicate an error condition.
CA002440294A 2002-09-10 2003-09-09 Frequency verification of an amplitude modulated signal Expired - Fee Related CA2440294C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US10/238,959 US6882832B2 (en) 2002-09-10 2002-09-10 Frequency verification of an amplitude modulated signal
US10/238,959 2002-09-10

Publications (2)

Publication Number Publication Date
CA2440294A1 true CA2440294A1 (en) 2004-03-10
CA2440294C CA2440294C (en) 2008-06-03

Family

ID=31991065

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002440294A Expired - Fee Related CA2440294C (en) 2002-09-10 2003-09-09 Frequency verification of an amplitude modulated signal

Country Status (2)

Country Link
US (1) US6882832B2 (en)
CA (1) CA2440294C (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7477700B2 (en) * 2004-02-27 2009-01-13 Harris Corporation Transmitting RF signals employing improved high-level combinations of analog FM and digital signals
US8965290B2 (en) * 2012-03-29 2015-02-24 General Electric Company Amplitude enhanced frequency modulation
US8830106B2 (en) 2012-08-30 2014-09-09 Texas Instruments Incorporated Asynchronous analog-to-digital converter having adapative reference control
RU2647986C1 (en) * 2016-10-17 2018-03-21 Публичное акционерное общество "Научно-производственное объединение "Алмаз" имени академика А.А. Расплетина" (ПАО "НПО "Алмаз") Method for measurement of carrier frequency of modulation amplitude

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4227255A (en) * 1979-04-11 1980-10-07 Telcom, Inc. Signal classifier
US4583211A (en) 1982-06-15 1986-04-15 Tokyo Shibaura Denki Kabushiki Kaisha Frequency detecting circuit for digital information reproducing system
US4672329A (en) * 1984-03-30 1987-06-09 Victor Company Of Japan, Ltd. Clock generator for digital demodulators
US4802237A (en) * 1987-07-02 1989-01-31 Covill Dennis H Solid state transmitter protector
US4819268A (en) * 1987-08-17 1989-04-04 Kahn Leonard R Transmitter having means for controlling undesired out-of-band radiation
JP2537267B2 (en) * 1988-05-30 1996-09-25 キヤノン株式会社 Vibration type actuator device
US5533136A (en) * 1993-11-04 1996-07-02 Smith; Terry L. Circuit for attenuating commercial interruptions during radio broadcasting

Also Published As

Publication number Publication date
CA2440294C (en) 2008-06-03
US20040048586A1 (en) 2004-03-11
US6882832B2 (en) 2005-04-19

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