US5379449A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automotive radio employing multipath correction strategy based on vehicle speed
Assignee: Visteon Global Technologies Inc
•
Filing: 1992-11-23
•
Granted: 1995-01-03
•
Expires: 2012-11-23
Abstract
Abstract An automotive radio system employs a plurality of corrective actions in response to the detection of multipath interference to reduce distortion audible to a listener. The speed of the vehicle is determined since the number of multipath events per unit time and the expected duration of each multipath event vary according to vehicle speed. The corrective action taken in response to detection of multipath interference depends upon the vehicle speed. In a diversity antenna system, antenna switching is suspended at high vehicle speed while filtering of the audio output to reduce noise is suspended at lower vehicle speeds.
Inventors
- 👤 Sylvester P. Porambo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:48
CPC Classifications
H; H04; H04B; H04B7/00; H04B7/02; H04B7/04; H04B7/08; H04B7/0802; H04B7/0805; H04B7/0814; H04B1/00; H04B1/06; H04B1/10; H04B1/1081; H04B1/16; H04B1/1646; H04B1/1661; H04B1/1669; H04B7/0834
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
102 words
A method for controlling a radio receiver in a vehicle comprising the steps of: generating a speed signal proportional to the speed at which said vehicle moves; receiving a radio signal at said radio receiver; generating a multipath signal upon detection of the presence of multipath distortion in said radio signal; and selecting a corrective action within said radio receiver in response to said multipath signal and said speed signal, wherein said radio receiver includes diversity antennas and wherein said corrective action includes switching between diversity antennas if said speed signal indicates the vehicle speed is less than a first predetermined speed.
Claim 2
Independent Claim
102 words
A method for controlling a radio receiver in a vehicle comprising the steps of: generating a speed signal proportional to the speed at which said vehicle moves; receiving a radio signal at said radio receiver; generating a multipath signal upon detection of the presence of multipath distortion in said radio signal; and selecting a corrective action within said radio receiver in response to said multipath signal and said speed signal, wherein said radio receiver includes diversity antennas and wherein said corrective action includes switching between diversity antennas if said speed signal indicates the vehicle speed is less than a first predetermined speed.
Claim 3
Dependent Claim
35 words
The method of claim 1 further comprising the step of identifying one of a plurality of speed ranges corresponding to said speed signal, and wherein said selecting step is responsive to said step of identifying.
Claim 4
Dependent Claim
30 words
The method of claim 1 wherein said corrective action includes filtering of said radio signal if said speed signal indicates the vehicle speed is greater than a second predetermined speed.
Claim 5
Dependent Claim
17 words
The method of claim 3 wherein said second predetermined speed is less than said first predetermined speed.
Claim 6
Dependent Claim
48 words
The method of claim 1 wherein said vehicle further includes a bus system for transmitting vehicle sensor and actuator signals between a plurality of electronic devices in said vehicle, said method further comprising the step of: receiving said speed signal in said radio receiver from said bus system.
Claim 7
Dependent Claim
137 words
Radio receiver apparatus for a vehicle comprising: speed sensor means for generating a speed signal proportional to the speed at which said vehicle moves; receiver means for receiving a radio signal; diversity antenna means coupled to said receiver means for providing either of at least two antenna signals in response to a selection signal; multipath means for generating a multipath signal upon detection of the presence of multipath distortion in said radio signal; and control means coupled to said speed sensor means, said receiver means, and said multipath means for selecting a corrective action within said receiver means in response to said multipath signal and said speed signal, wherein said control means changes said selection signal in response to said multipath signal when said speed signal indicates the vehicle speed is less than a first predetermined speed.
Claim 8
Dependent Claim
137 words
Radio receiver apparatus for a vehicle comprising: speed sensor means for generating a speed signal proportional to the speed at which said vehicle moves; receiver means for receiving a radio signal; diversity antenna means coupled to said receiver means for providing either of at least two antenna signals in response to a selection signal; multipath means for generating a multipath signal upon detection of the presence of multipath distortion in said radio signal; and control means coupled to said speed sensor means, said receiver means, and said multipath means for selecting a corrective action within said receiver means in response to said multipath signal and said speed signal, wherein said control means changes said selection signal in response to said multipath signal when said speed signal indicates the vehicle speed is less than a first predetermined speed.
Claim 9
Dependent Claim
61 words
The apparatus of claim 6 further comprising: filter means coupled to said receiver means for selectably highpass filtering an audio signal output from said receiver means in response to an activation signal; wherein said control means produces said activation signal in response to said multipath signal when said speed signal indicates the vehicle speed is greater than a second predetermined speed.
Claim 10
Dependent Claim
17 words
The apparatus of claim 7 wherein said second predetermined speed is less than said first predetermined speed.
Claim 11
Dependent Claim
26 words
The apparatus of claim 6 further comprising: bus means for interfacing with a vehicle multiplex system and for receiving said speed signal from said multiplex system.
References Cited (Backward Citations)
US2224678A
Cited
US3693088A
Cited
DE2501883A1
Cited
US4157455A
Cited
JPS5652941A
Cited
JPS56149126A
Cited
JPS56149125A
Cited
JPS56149128A
Cited
US4495653A
Cited
US4499606A
Cited
US5034984A
Cited
US4710958A
Cited
JPH01149619A
Cited
US5105150A
Cited
US5036543A
Cited
JPH03148923A
Cited
JPH03190331A
Cited
US5113446A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-01-02 | 1998-07-04 | 1999-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-01-02 | 2002-07-04 | 2003-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-01-02 | 2006-07-04 | 2007-01-03 | $7700.00 | Window Closed / Lapsed |