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WO1999049581A3 - Am quality detector - Google Patents

Am quality detector Download PDF

Info

Publication number
WO1999049581A3
WO1999049581A3 PCT/IB1999/000382 IB9900382W WO9949581A3 WO 1999049581 A3 WO1999049581 A3 WO 1999049581A3 IB 9900382 W IB9900382 W IB 9900382W WO 9949581 A3 WO9949581 A3 WO 9949581A3
Authority
WO
WIPO (PCT)
Prior art keywords
scanning
station
signal
received
receiver
Prior art date
Application number
PCT/IB1999/000382
Other languages
French (fr)
Other versions
WO1999049581A2 (en
Inventor
Martinus J J G Verheijden
Original Assignee
Koninkl Philips Electronics Nv
Philips Svenska Ab
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 Koninkl Philips Electronics Nv, Philips Svenska Ab filed Critical Koninkl Philips Electronics Nv
Priority to EP99905127A priority Critical patent/EP0995273A2/en
Priority to KR1019997010955A priority patent/KR20010012983A/en
Priority to JP54797799A priority patent/JP2002500850A/en
Publication of WO1999049581A2 publication Critical patent/WO1999049581A2/en
Publication of WO1999049581A3 publication Critical patent/WO1999049581A3/en

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
    • H04B1/06—Receivers
    • H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
    • H04B1/1027—Means associated with receiver for limiting or suppressing noise or interference assessing signal quality or detecting noise/interference for the received signal
    • 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
    • H04B1/06—Receivers
    • H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J7/00—Automatic frequency control; Automatic scanning over a band of frequencies
    • H03J7/02—Automatic frequency control
    • H03J7/04—Automatic frequency control where the frequency control is accomplished by varying the electrical characteristics of a non-mechanically adjustable element or where the nature of the frequency controlling element is not significant

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Noise Elimination (AREA)
  • Monitoring And Testing Of Transmission In General (AREA)
  • Circuits Of Receivers In General (AREA)

Abstract

During an automatic scanning of an AM frequency band it is required that the scanning is only stopped when a usable audio signal is received. To achieve this normally the receiver checks the (RF) signal level and the IF frequency of the received signal. Because at night the propagation of AM signals is improved as a consequence of the weather conditions it is possible that a far away station having the same transmitting fequency interferes with a local station. To overcome this a detector and receiver are proposed whereby the detector detects interferences of two or more stations and supplies a detection signal resulting in resuming scanning for a next station.
PCT/IB1999/000382 1998-03-26 1999-03-08 Am quality detector WO1999049581A2 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP99905127A EP0995273A2 (en) 1998-03-26 1999-03-08 Am quality detector
KR1019997010955A KR20010012983A (en) 1998-03-26 1999-03-08 AM quality detector
JP54797799A JP2002500850A (en) 1998-03-26 1999-03-08 AM quality detector

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP98200938.3 1998-03-26
EP98200938 1998-03-26

Publications (2)

Publication Number Publication Date
WO1999049581A2 WO1999049581A2 (en) 1999-09-30
WO1999049581A3 true WO1999049581A3 (en) 2000-01-06

Family

ID=8233513

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB1999/000382 WO1999049581A2 (en) 1998-03-26 1999-03-08 Am quality detector

Country Status (5)

Country Link
EP (1) EP0995273A2 (en)
JP (1) JP2002500850A (en)
KR (1) KR20010012983A (en)
CN (1) CN1273714A (en)
WO (1) WO1999049581A2 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19949250B4 (en) * 1999-10-13 2007-06-21 Harman Becker Automotive Systems Gmbh Method for automatically finding an AM broadcast program
US7274918B1 (en) 2001-01-11 2007-09-25 Harman Becker Automotive Systems Gmbh Apparatus for automatically finding an am radio program
CN107483132B (en) * 2017-08-14 2020-05-15 惠州市德赛西威汽车电子股份有限公司 AM channel combined type searching method

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5307515A (en) * 1991-08-05 1994-04-26 Ford Motor Company Adjacent channel controller for radio receiver
US5390345A (en) * 1990-06-01 1995-02-14 Nippon Telegraph And Telephone Corporation Method for preventing desensitization and radio interference of radio receivers
EP0887944A2 (en) * 1997-06-27 1998-12-30 Ford Global Technologies, Inc. Digital processing radio receiver

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5390345A (en) * 1990-06-01 1995-02-14 Nippon Telegraph And Telephone Corporation Method for preventing desensitization and radio interference of radio receivers
US5307515A (en) * 1991-08-05 1994-04-26 Ford Motor Company Adjacent channel controller for radio receiver
EP0887944A2 (en) * 1997-06-27 1998-12-30 Ford Global Technologies, Inc. Digital processing radio receiver

Also Published As

Publication number Publication date
CN1273714A (en) 2000-11-15
EP0995273A2 (en) 2000-04-26
KR20010012983A (en) 2001-02-26
JP2002500850A (en) 2002-01-08
WO1999049581A2 (en) 1999-09-30

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