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1. (WO2001006768) TELEVISION RECEIVER FOR DIGITAL SIGNALS WITH OFFSET TUNING PROVISIONS

Pub. No.:    WO/2001/006768    International Application No.:    PCT/US2000/019103
Publication Date: Fri Jan 26 00:59:59 CET 2001 International Filing Date: Fri Jul 14 01:59:59 CEST 2000
IPC: H03H 9/64
H04N 5/21
H04N 5/44
H04N 5/46
H04N 5/50
Applicants: THOMSON LICENSING S.A.
MAYER, Matthew, Thomas
Inventors: MAYER, Matthew, Thomas
Title: TELEVISION RECEIVER FOR DIGITAL SIGNALS WITH OFFSET TUNING PROVISIONS
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.