US Patent No: 6,389,270

Number of patents in Portfolio can not be more than 2000

Station scan method and apparatus for radio receivers

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Importance

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Abstract

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Station scan circuitry for a radio-frequency receiver and corresponding methods are disclosed that efficiently determine the presence of a station on available channels. The station scan circuitry includes circuitry that determines if the signal power on a given channel exceeds a threshold value. Additional circuitry compares the channel signal strength and the adjacent channel signal to determine if a ratio of the two exceeds a threshold level. If both the signal power and the signal strength ratio are sufficient, the station scan circuitry indicates that a station has been found. To make the signal strength comparison, the station scan circuitry includes circuitry for determining a post-filter signal strength and a pre-filter signal strength for the received signal.

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First Claim

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Patent Owner(s)

Patent OwnerAddressTotal Patents
CIRRUS LOGIC, INC.AUSTIN, TX1240

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Chan, Brian P Lum Shue Austin, TX 4 28
Nohrden, James M Lakeway, TX 15 133

Cited Art Landscape

Patent Info (Count) # Cites Year
 
Blaupunkt-Werke GmbH (4)
4,476,581 FM Receiver with subcarrier decoding circuit 7 1982
4,688,110 Method and apparatus for recording a video signal without loss of a sound signal recorded on the same tracks 4 1985
5,430,890 Radio receiver for mobile reception with sampling rate oscillator frequency being an integer-number multiple of reference oscillation frequency 44 1992
5,339,455 Radio receiver adjacent-channel interference suppression circuit 55 1993
 
GENERAL INSTRUMENT CORPORATION (2)
4,646,150 Apparatus and method for stereo television sound 22 1986
4,821,097 Apparatus and method for providing digital audio on the sound carrier of a standard television signal 150 1987
 
FREESCALE SEMICONDUCTOR, INC. (1)
6,192,089 Electronic circuit and method for automatic frequency control 15 1998
 
MOTOROLA, INC. (1)
4,461,026 Radio with audio graphic equalizer 11 1981
 
Nippon Gakki Seizo Kabushiki Kaisha (1)
4,404,430 FM Stereo demodulation circuit with voltage dividing and multiplexing techniques 12 1981
 
SAMSUNG ELECTRONICS CO., LTD. (1)
5,751,806 Audio information dissemination using various transmission modes 135 1996
 
Sencore, Inc. (1)
4,823,390 FM stereo generator 4 1988
 
SHINTOM CO., LTD. (1)
5,740,523 Radio receiver 12 1995
 
SONY CORPORATION (1)
5,909,644 AM radio receiver 10 1996
 
U.S. PHILIPS CORPORATION (1)
5,548,831 FM Receiver having multiple IF stages 34 1993
 
USA DIGITAL RADIO, INC. (1)
4,698,670 Cable stereo apparatus 56 1986
 
VISTEON GLOBAL TECHNOLOGIES, INC. (1)
5,613,230 AM receiver search tuning with adaptive control 17 1995

Patent Citation Ranking

Forward Cite Landscape

Patent Info (Count) # Cites Year
 
FREESCALE SEMICONDUCTOR, INC. (2)
6,868,129 Demodulator for a radio receiver and method of operation 11 2001
7,031,680 Stop-on-station method and apparatus 2 2002
 
CIRRUS LOGIC, INC. (1)
6,694,026 Digital stereo recovery circuitry and method for radio receivers 20 1999
 
FUTUREWEI TECHNOLOGIES, INC. (1)
8,077,676 System and method for wireless channel sensing 3 2007
 
HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P. (1)
7,369,825 Selection of radio station based on preferred program content 9 2001
 
PANASONIC AUTOMOTIVE SYSTEMS COMPANY OF AMERICA, DIVISION OF PANASONIC CORPORATION OF NORTH AMERICA (1)
8,406,715 Method and apparatus for dynamically adapting FM tuner sensitivity to a local environment for a single-tuner system 1 2008
 
SILICON LABORATORIES INC. (1)
7,957,696 System and method for selecting channels for short range transmissions to broadcast receivers 2 2006
 
TEXAS INSTRUMENTS INCORPORATED (1)
7,003,276 Subsampling communication receiver architecture with gain control and RSSI generation 6 2002
 
Other [Check patent profile for assignment information] (1)
7,877,069 Method and apparatus for masking program content 0 2005