Telecommunications – Receiver or analog modulated signal frequency converter – Local control of receiver operation
Reexamination Certificate
2005-10-11
2005-10-11
Trinh, Sonny (Department: 2687)
Telecommunications
Receiver or analog modulated signal frequency converter
Local control of receiver operation
C455S183200, C455S192200, C455S255000
Reexamination Certificate
active
06954625
ABSTRACT:
A tuner comprises a first frequency changer with a mixer and local oscillator. The output of the frequency changer is connected to a first intermediate frequency filter, whose output is connected to a second frequency changer. The output of the frequency changer is connected to the usual second intermediate frequency filter and to an amplitude detector. A reference oscillator is connectable under control of a controller via a multiplexer to the input of the mixer. During an alignment mode of the tuner, the reference signal from the oscillator is supplied to the mixer and the local oscillators and are controlled by the controller to sweep across a frequency range encompassing all possible pass frequencies of the filter. The controller monitors the output of the detector so as to establish the frequency response of the filter. Frequency offsets are then stored in the synthesizers and so as to center each channel during a reception mode on the actual center frequency of the filter.
REFERENCES:
patent: 4736456 (1988-04-01), Maier
patent: 4932072 (1990-06-01), Toko
patent: 4956711 (1990-09-01), Maier
patent: 6067332 (2000-05-01), Taura et al.
patent: 2002/0054651 (2002-05-01), Posti
patent: 2205460 (1988-12-01), None
patent: 2244877 (1991-12-01), None
patent: 2344710 (2000-06-01), None
Bhattacharya Sam
Thompson Hine LLP
Trinh Sonny
Zarlink Semiconductor Limited
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