Group delay equalization of radio frequency signals by...

Details Group delay equalization of radio frequency signals by... Group delay equalization of radio frequency signals by...

H - Electricity

04

N

H04N 5/38 (2006.01) H04B 1/62 (2006.01)

Patent

CA 2254370

Undesirable group delay distortion caused by radio frequency (RF) band pass filters (or other sources) that cannot practically be equalized even at conventional intermediate frequencies (IF) are pre-compensated at lower, secondary-IF frequencies. The IF signal is translated to the lower, secondary IF frequency range that allows the group delay distortion to be equalized in piecewise frequency segments. One implementation provides for two consecutive frequency translations of a 41-47 MHz IF TV signal down to a secondary IF band of 4-10 MHz; two equalizers that operate in the 4-7 MHz range consecutively equalize the lower and upper halves of the 6 MHz broadband TV signal. More generally, the compensating scheme for compensating for group delay distortion that includes: consecutively translating plural frequency segments of a signal in a first frequency band to one or more target frequency segments, and equalizing, in the target frequency segments, the consecutively-translated frequency segments of the signal, so as to compensate for the group delay distortion that is inherent in the respective frequency segments of the signal in the first frequency band.

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