Telecommunications – Receiver or analog modulated signal frequency converter – Signal selection based on frequency
Patent
1996-12-26
1999-11-23
Eisenzopf, Reinhard J.
Telecommunications
Receiver or analog modulated signal frequency converter
Signal selection based on frequency
4551922, H04B 100
Patent
active
059916095
ABSTRACT:
A technique for the automatic alignment and tuning of the front end of a vehicle radio. A tuning voltage is applied to a multiplying digital-to-analog converter before being applied to a front end tuning circuitry of the radio. A tuning voltage antenna number is applied to the tuning voltage at the converter to scale the tuning voltage, and adjust the center frequency tuning of the front end. During alignment, the tuning voltage antenna number is used to modulate the tuning voltage around a mean by reprogramming the tuning voltage antenna number a few values higher and lower in sequence. This modulation of the antenna tuning voltage creates an AC modulation component on the signal strength indicator signal passing through the front end. The signal strength indicator signal is measured and compared to its value before the tuning voltage antenna number was changed. If the signal strength indicator signal is higher for a higher tuning voltage antenna number, the front end is misaligned to the low side of the desired alignment point. Likewise, if the signal strength indicator signal is lower for an increasing tuning voltage antenna number, the front end is misaligned to the high side. If there is no change in the signal strength indicator signal for both increases and decreases in the tuning voltage antenna number, the front end is optimally aligned.
REFERENCES:
patent: 3255414 (1966-06-01), Kawalek et al.
patent: 3820100 (1974-06-01), Ballinger et al.
patent: 4079320 (1978-03-01), Mogi
patent: 4712060 (1987-12-01), Bailey et al.
patent: 4789996 (1988-12-01), Butcher
patent: 5077783 (1991-12-01), Leppanen
patent: 5126602 (1992-06-01), Lee et al.
patent: 5152005 (1992-09-01), Bcickley
patent: 5201063 (1993-04-01), Tam et al.
patent: 5301358 (1994-04-01), Gaskill et al.
patent: 5335362 (1994-08-01), Vaisanen et al.
patent: 5428829 (1995-06-01), Osburn et al.
patent: 5491715 (1996-02-01), Flaxi
patent: 5524288 (1996-06-01), Monge Navarro
patent: 5550878 (1996-08-01), Shigaki et al.
patent: 5592125 (1997-01-01), Williams
patent: 5619148 (1997-04-01), Guo
patent: 5619171 (1997-04-01), Rijckaert et al.
patent: 5697068 (1997-12-01), Salvi et al.
Dale Ronald W
Easterwood Michael John
Kennelly Thomas Joseph
Marrah Jeffrey Joseph
Pham Linh Ngoc
Aoki Makoto
Delco Electronics Corporation
Eisenzopf Reinhard J.
Funke Jimmy L.
LandOfFree
Low cost digital automatic alignment method and apparatus does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Low cost digital automatic alignment method and apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Low cost digital automatic alignment method and apparatus will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1233266