Television receiver for digital signals with offset tuning...

Details Television receiver for digital signals with offset tuning... Television receiver for digital signals with offset tuning...

2007-07-03

2007-07-03

Tran, Trang (Department: 2622)

Television

Receiver circuitry

Tuning

C348S021000, C348S725000

Reexamination Certificate

active

10031155

ABSTRACT:
A television receiver for receiving digital and analog signals that reduces adjacent channel interference when receiving digital signals susceptible to interference caused by a lower adjacent NTSC signal. Upon receiving the digital signal, the receiver heterodynes the digital signal with a local oscillator (LO) signal to produce an intermediate frequency (IF) signal. A microprocessor searches a memory unit for stored information regarding the digital broadcast channel and determines the presence or absence of a lower adjacent NTSC channel. In the case a lower adjacent NTSC channel is present, the microprocessor shifts the frequency of the LO signal causing the IF signal to shift towards the lower band edge of a surface acoustic wave (SAW) filter present in a digital signal processor further attenuating the lower adjacent NTSC channel.

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