Pulse or digital communications – Receivers – Automatic baseline or threshold adjustment
Patent
1994-03-10
1996-07-02
Chin, Stephen
Pulse or digital communications
Receivers
Automatic baseline or threshold adjustment
375319, 455343, H04L 2506
Patent
active
055330584
ABSTRACT:
A low signal detection circuit for use in an electronic tolling system which wakes up a receiver circuit associated with the tolling system based upon the type of signal received. An RF signal transmitted by the electronic tolling system is Manchester encoded and will therefore have a frequency within predetermined values. The system will detect the incoming RF signals or count the rising and falling edges of the baseband signal and apply the counts to a threshold circuit which will compare the number of counts to a predetermined value. If the number of counts falls within a predetermined range, then a signal indicating the presence of a valid RF signal will be output from the wake-up circuit. A power management circuit receives a clock signal from an oscillator circuit and provides a power signal which will wake up the detection circuitry for only a minimum predetermined period of time.
REFERENCES:
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patent: 4555667 (1985-11-01), Cressey et al.
patent: 4606050 (1986-08-01), Sekigawa et al.
patent: 5150954 (1992-09-01), Hoff
patent: 5170396 (1992-12-01), Rivers et al.
patent: 5287359 (1994-02-01), Engelse
Kady Mark A.
Wenos Vincent M.
Chin Stephen
Delco Electronics Corporation
Funke Jimmy L.
Luu Huong
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