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
Stats
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May 14, 2002
Issued date -
Mar 10, 1999
filing date -
09/266,418
serial no -
In Force
status
Importance
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Abstract
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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International Classification(s)
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Cited Art
| Patent Info | (Count) | # Cites | Year |
|---|---|---|---|
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| 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 | 43 | 1992 | |
| 5,339,455 Radio receiver adjacent-channel interference suppression circuit | 50 | 1993 | |
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| 4,646,150 Apparatus and method for stereo television sound | 20 | 1986 | |
| 4,821,097 Apparatus and method for providing digital audio on the sound carrier of a standard television signal | 121 | 1987 | |
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| 6,192,089 Electronic circuit and method for automatic frequency control | 14 | 1998 | |
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| 4,461,026 Radio with audio graphic equalizer | 9 | 1981 | |
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| 4,404,430 FM Stereo demodulation circuit with voltage dividing and multiplexing techniques | 12 | 1981 | |
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| 5,751,806 Audio information dissemination using various transmission modes | 111 | 1996 | |
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| 4,823,390 FM stereo generator | 4 | 1988 | |
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| 5,740,523 Radio receiver | 11 | 1995 | |
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| 5,909,644 AM radio receiver | 9 | 1996 | |
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| 5,548,831 FM Receiver having multiple IF stages | 28 | 1993 | |
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| 4,698,670 Cable stereo apparatus | 45 | 1986 | |
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| 5,613,230 AM receiver search tuning with adaptive control | 16 | 1995 | |
Patent Citation Ranking
Maintenance Fees
| Fee | Large entity fee | small entity fee | micro entity fee | due date |
|---|---|---|---|---|
| 11.5 Year Payment | $7400.00 | $3700.00 | $1850.00 | Nov 14, 2013 |
| Fee | Large entity fee | small entity fee | micro entity fee |
|---|---|---|---|
| Surcharge - 11.5 year - Late payment within 6 months | $160.00 | $80.00 | $40.00 |
| Surcharge after expiration - Late payment is unavoidable | $700.00 | $350.00 | $175.00 |
| Surcharge after expiration - Late payment is unintentional | $1,640.00 | $820.00 | $410.00 |