CA2497947A1 - Transmitting rf signals employing improved high-level combinations of analog fm and digital signals - Google Patents

Transmitting rf signals employing improved high-level combinations of analog fm and digital signals Download PDF

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Publication number
CA2497947A1
CA2497947A1 CA002497947A CA2497947A CA2497947A1 CA 2497947 A1 CA2497947 A1 CA 2497947A1 CA 002497947 A CA002497947 A CA 002497947A CA 2497947 A CA2497947 A CA 2497947A CA 2497947 A1 CA2497947 A1 CA 2497947A1
Authority
CA
Canada
Prior art keywords
signal
digital
analog
amplified
fractional portion
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
CA002497947A
Other languages
French (fr)
Other versions
CA2497947C (en
Inventor
George Cabrera
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 CA2497947A1 publication Critical patent/CA2497947A1/en
Application granted granted Critical
Publication of CA2497947C publication Critical patent/CA2497947C/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/02—Transmitters
    • H04B1/04—Circuits
    • H04B1/0483—Transmitters with multiple parallel paths
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
    • H04B1/40—Circuits
    • H04B1/403—Circuits using the same oscillator for generating both the transmitter frequency and the receiver local oscillator frequency
    • H04B1/406—Circuits using the same oscillator for generating both the transmitter frequency and the receiver local oscillator frequency with more than one transmission mode, e.g. analog and digital modes

Abstract

Apparatus and method are presented for broadcasting an RF signal comprised of analog FM and digital signals. An analog FM source provides an analog FM signal. A digital source provides a digital signal. A splitter splits the FM signal into a fractional portion and remainder portion. A summer combines the fractional portion with the digital signal to provide a first combined signal. A main FM transmitter amplifies the remainder portion to provide an amplified FM signal. A digital transmitter amplifies the first combined signal to provide an amplified combined signal. A combiner combines the amplified FM signal and the amplified combined signal to provide a composite RF signal to be broadcasted. -20-

Claims (7)

1. An apparatus for broadcasting an RF signal comprised of analog FM and digital signals and comprising:
an analog FM source for providing an analog FM
signal;
a digital source for providing a digital signal;
a splitter for splitting the FM signal into a fractional portion and remainder portion;
a summer for combining said fractional portion with said digital signal to provide a first combined signal;
a main FM transmitter for amplifying said remainder portion to provide an amplified FM signal;
a digital transmitter for amplifying said first combined signal to provide an amplified combined signal; and a combiner that combines said amplified FM signal and said amplified combined signal to provide a composite RF
signal to be broadcasted.
2. An apparatus as set forth in claim 1 including a phase adjuster located intermediate said splitter and said summer for adjusting the phase of said fractional portion.
3. An apparatus as set forth in claim 1 wherein said digital source is an IBOC source and said digital signal is an IBOC digital signal.
4. An apparatus as set forth in claim 3 including a phase adjuster located intermediate said splitter and said summer for adjusting the phase of said fractional portion.
5. A method for broadcasting an RF signal comprised of:
analog FM and digital signals including the steps of:
providing an analog FM signal;

providing a digital signal;
extracting a fractional portion of said FM signal;
combining said fractional portion with said digital signal;
amplifying the FM signal portion remaining after said fractional portion has been extracted to provide an amplified FM signal;
amplifying said first combined signal to provide an amplified combined signal; and combining said amplified FM signal with said amplified combined signal to provide a composite RF signal to be broadcast.
6. A method as set forth in claim 5 including the step of adjusting the phase of said fractional portion.
7. A method as set forth in claim 6 including the step of adjusting the phase of said fractional portion.
CA2497947A 2004-02-27 2005-02-22 Transmitting rf signals employing improved high-level combinations of analog fm and digital signals Expired - Fee Related CA2497947C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US10/788,710 2004-02-27
US10/788,710 US7477700B2 (en) 2004-02-27 2004-02-27 Transmitting RF signals employing improved high-level combinations of analog FM and digital signals

Publications (2)

Publication Number Publication Date
CA2497947A1 true CA2497947A1 (en) 2005-08-27
CA2497947C CA2497947C (en) 2010-06-29

Family

ID=34887058

Family Applications (1)

Application Number Title Priority Date Filing Date
CA2497947A Expired - Fee Related CA2497947C (en) 2004-02-27 2005-02-22 Transmitting rf signals employing improved high-level combinations of analog fm and digital signals

Country Status (2)

Country Link
US (1) US7477700B2 (en)
CA (1) CA2497947C (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7272363B1 (en) * 2004-02-06 2007-09-18 Fluker Stephen M HD digital radio combining methods and systems
US7623833B2 (en) 2006-04-13 2009-11-24 Harris Corporation Dual output digital exciter
US8965290B2 (en) * 2012-03-29 2015-02-24 General Electric Company Amplitude enhanced frequency modulation
CN103457615A (en) * 2013-08-16 2013-12-18 奥维通信股份有限公司 Audio broadcasting frequency modulation transmitter based on digital-analog networking

Family Cites Families (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4507746A (en) * 1982-07-28 1985-03-26 The United States Of America As Represented By The Secretary Of The Army Programmable matched filter for binary phase-coded signals
US4660192A (en) * 1985-04-11 1987-04-21 Pomatto Sr Robert P Simultaneous AM and FM transmitter and receiver
US5029003A (en) * 1989-12-18 1991-07-02 General Electric Company Apparatus for incorporating digital signals with a standard TV signal
US5315583A (en) 1991-04-11 1994-05-24 Usa Digital Radio Method and apparatus for digital audio broadcasting and reception
US5465396A (en) * 1993-01-12 1995-11-07 Usa Digital Radio Partners, L.P. In-band on-channel digital broadcasting
US5436930A (en) * 1993-06-14 1995-07-25 At&T Corp. Simultaneous analog and digital communications with a selection of different signal point constellations based on signal energy
JPH09504915A (en) * 1993-09-10 1997-05-13 アマティ・コミュニケーションズ・コーポレーション Digital sound broadcasting using a dedicated control channel
US5956624A (en) * 1994-07-12 1999-09-21 Usa Digital Radio Partners Lp Method and system for simultaneously broadcasting and receiving digital and analog signals
IL114471A0 (en) * 1994-07-12 1996-01-31 Usa Digital Radio Partners L P Method and system for simultaneously broadcasting and analog signals
WO1996021291A1 (en) * 1995-01-03 1996-07-11 Northrop Grumman Corporation Method and apparatus for improving am compatible digital broadcast analog fidelity
US5949793A (en) * 1996-07-22 1999-09-07 Cellularvision Technology & Telecommunications, L.P. Transmission of digital and analog signals in the same band
US6144705A (en) 1996-08-22 2000-11-07 Lucent Technologies Inc. Technique for simultaneous communications of analog frequency-modulated and digitally modulated signals using precanceling scheme
US5991334A (en) * 1996-11-12 1999-11-23 Lucent Technologies Inc. Technique for simultaneous communications of analog frequency-modulated and digitally modulated signals using postcanceling scheme
US6549242B1 (en) * 1997-04-04 2003-04-15 Harris Corporation Combining adjacent TV channels for transmission by a common antenna
US6243424B1 (en) * 1998-03-27 2001-06-05 Ibiguity Digital Corporation Method and apparatus for AM digital broadcasting
US6721337B1 (en) * 1999-08-24 2004-04-13 Ibiquity Digital Corporation Method and apparatus for transmission and reception of compressed audio frames with prioritized messages for digital audio broadcasting
US6549544B1 (en) * 1999-11-10 2003-04-15 Ibiquity Digital Corporation Method and apparatus for transmission and reception of FM in-band on-channel digital audio broadcasting
US7088740B1 (en) * 2000-12-21 2006-08-08 Bae Systems Information And Electronic Systems Integration Inc Digital FM radio system
DE60100337T2 (en) * 2001-07-11 2004-05-06 Sony International (Europe) Gmbh DRM / AM simulcast
US6882832B2 (en) * 2002-09-10 2005-04-19 Harris Corporation Frequency verification of an amplitude modulated signal
US6898249B2 (en) * 2002-12-17 2005-05-24 Ibiquity Digital Corporation Method and apparatus for AM digital audio broadcasting with amplitude scaled tertiary subcarriers
US6914579B2 (en) * 2003-03-26 2005-07-05 Spx Corporation Apparatus and method for isolating in-channel FM antennas sharing common aperture space

Also Published As

Publication number Publication date
CA2497947C (en) 2010-06-29
US20050190851A1 (en) 2005-09-01
US7477700B2 (en) 2009-01-13

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EEER Examination request
MKLA Lapsed

Effective date: 20130222