Radio signal receiver device

Details Radio signal receiver device Radio signal receiver device

2009-07-01

2011-12-06

Hannon, Christian (Department: 2618)

Telecommunications

Receiver or analog modulated signal frequency converter

With particular receiver circuit

C455S254000, C455S343200

Reexamination Certificate

active

08073421

ABSTRACT:
A radio signal detector includes first and second detector circuits. The first detector circuit has a higher detection sensitivity to detect a radio signal earlier than the second detector circuit. The second detector circuit has a lower detection sensitivity to detect the radio signal accurately. When the second detector circuit detects the radio signal, it starts up a microcomputer. When the first detector circuit detects the radio signal, a time counter starts to count time. After being started up, the microcomputer acquires a time difference between the radio signal detection by the first detector circuit and the start-up. The microcomputer determines time of radio signal transmission by a radio signal transmitter device based on the determined time difference, and outputs control information after an elapse of a predetermined time.

REFERENCES:
patent: 5220687 (1993-06-01), Ichikawa et al.
patent: 7149480 (2006-12-01), Miyahara
patent: 2008/0232431 (2008-09-01), Sanji et al.
patent: 2010/0029235 (2010-02-01), Bouillet
patent: 4-286228 (1992-10-01), None
patent: 2007-186065 (2007-07-01), None

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