I-Q channel adaptive line enhancer

Details I-Q channel adaptive line enhancer I-Q channel adaptive line enhancer

1987-03-26

1988-11-29

Ruggiero, Joseph

Boots, shoes, and leggings

333166, 333 18, 364825, 375 14, 375 15, G06J 100, H04B 314

Patent

active

047886528

ABSTRACT:
An I-Q channel adaptive line enhancer has bandpass filters with passbands that can be widened to well beyond the band that is actually being processed by the adaptive line enhancer. This eliminates the requirement of filtering one of the sidebands as is required in single channel adaptive line enhancers, in which the sum and difference sidebands are generated on up-conversion. Band limiting is done with lowpass filters, and the local oscillator may be made variable so that any part of the band that is passed by the bandpass filters can be processed by a single I-Q channel adaptive line enhancer. This type of I-Q channel adaptive line enhancer can process any one of a large number of possible bands without tunable bandpass filters, or without banks of adaptive line enhancers which have been preset to adjacent sub-bands.

REFERENCES:
patent: 4225832 (1980-09-01), Faye
patent: 4236224 (1980-11-01), Chang
patent: 4238746 (1980-12-01), McCool et al.
patent: 4243935 (1981-01-01), McCool et al.
patent: 4351060 (1982-09-01), Treiber
patent: 4635276 (1987-01-01), Karabinis
patent: 4726035 (1988-02-01), Bullock et al.

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