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#X text 116 59 review of ring modulation;
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#X text 183 257 multiplication by a constant;
#X text 184 275 changes the amplitude of a signal;
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#X text 556 272 multiplication by a constant;
#X text 557 290 changes the amplitude of a signal;
#X text 525 197 multiplication by a time-varying signal;
#X text 526 214 changes the frequency content of the signal;
#X text 526 231 (i.e. \, ring modulation);
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