Frequency converter for a television signal

Details Frequency converter for a television signal Frequency converter for a television signal

1999-06-04

2008-12-23

Natnael, Paulos M (Department: 2622)

Television

Receiver circuitry

C375S350000, C455S130000

Reexamination Certificate

active

07468761

ABSTRACT:
A frequency converter for converting an intermediate-frequency television signal (s2) to a low frequency by means of a mixer (4) which is fed at its radio-frequency signal input (4.1) with the intermediate-frequency television signal (s2) via an intermediate-frequency filter (3) and at its local-oscillator-signal input (4.2) with a local-oscillator signal (u), the frequency of the local-oscillator signal (u) lying in the range of an adjacent picture carrier (NBT) which is defined by the channel spacing (k0; k0*) and the respective television standard, and which after the frequency conversion is suppressed as a converted adjacent picture carrier (NBT*), or at least attenuated to a negligible residual amplitude, by means of a high-pass selectivity skirt (HP) of a filter device (5).

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patent: 0 813 345 (1997-12-01), None

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