455 / | HD | TELECOMMUNICATIONS |
130 | DF | RECEIVER OR ANALOG MODULATED SIGNAL FREQUENCY CONVERTER {24} |
296 | DF | .~ Noise or interference elimination {10} |
303 | DF | .~.~ Using plural separate signal paths {2} |
305 | .~.~.~ With balancing or neutralizing {1} | |
306 | DF | .~.~.~.~> Filter in at least one path |