Assertion: signal | /r/HasProperty | multiplied by the bfo waveform
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text: When the signal is multiplied by (aka heterodyned with) the BFO waveform, it shifts the signal to ( F if + F bfo ) {\displaystyle \left(F_{\text{if}}+F_{\text{bfo}}\right)} , and to | F if − F bfo | {\displaystyle \left|F_{\text{if}}-F_{\text{bfo}}\right|} , which is known as the beat frequency or image frequency.