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+#X text 30 242 sample loop for;
+#X text 30 260 test signal;
+#X text 35 321 pair of allpass;
+#X text 34 338 filters to make;
+#X text 34 356 90 degree phase;
+#X text 32 373 shifted versions;
+#X text 238 323 <-- shift frequency;
+#X text 310 356 cosine and sine waves;
+#X text 55 7 SINGLE SIDEBAND MODULATION;
+#X text 300 7 (AKA FREQUENCY SHIFTING);
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+#X text 352 547 updated for Pd version 0.39;
+#X obj 188 347 phasor~;
+#X text 123 438 <-- complex multipier;
+#X text 122 455 (calculates real part);
+#X text 309 371 to form the real and;
+#X text 309 387 imaginary part of a;
+#X text 309 404 complex sinusoid;
+#X text 43 37 The signal sideband modulator gives you only one sideband
+for each frequency in the input signal (whereas ring modulation gave
+both a positive and negative sideband). You can set the shift frequency
+positive to shift all frequencies upward \, or negative to shift them
+downwards.;
+#X text 42 117 The technique is to filter the input into two versions
+\, 90 degrees out of phase \, which can be interpreted as the real
+and imaginary part of a complex signal with positive frequencies only.
+You can then form the (complex) product of this with a (complex) sinusoid
+to modulate upward or downward in frequency.;
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+#X text 42 213 The "Hilbert~" object is an abstraction in pd/extra.
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