| electrical signal | 68 |
| input signal | 60 |
| audio signal | 39 |
| digital signal | 38 |
| analog signal | 25 |
| tv signal | 3 |
| pwm signal | 2 |
| weak signal | 2 |
| turn signal | 1 |
| phase | 0.65 |
| high level | 0.47 |
| turn | 0.35 |
| stop | 0.34 |
| accordance | 0.34 |
| phase quadrature | 0.32 |
| maximum | 0.32 |
| observer | 0.30 |
| range | 0.30 |
| minimum | 0.30 |
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| exceed the threshold | 0.65 |
| arrive at the receiver | 0.62 |
| cancel each other | 0.60 |
| interfere with each oth… | 0.59 |
| remain high | 0.58 |
| tell the brain | 0.58 |
| turn red | 0.58 |
| go over the threshold | 0.57 |
| arrive at same time | 0.57 |
| indicate change | 0.56 |
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| interference | 0.47 |
| towing vessel | 0.31 |
| frequency | 0.64 |
| amplitude | 0.62 |
| magnitude | 0.57 |
| different characteristi… | 0.48 |
| value | 0.43 |
| waveform | 0.40 |
| same frequency | 0.40 |
| different frequencies | 0.37 |
| component | 0.35 |
| different phases | 0.35 |
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| change | 0.41 |
| analyzed | 0.69 |
| filtered | 0.69 |
| digitized | 0.66 |
| attenuated | 0.65 |
| monitored | 0.64 |
| amplified | 0.64 |
| shown in figure | 0.64 |
| encoded | 0.64 |
| mixed | 0.63 |
| transmitted by the tran… | 0.62 |
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| temperature | 0.39 |
| the like | 0.33 |
| ultrasonic echoes | 0.32 |
| ambient light level | 0.30 |
| communication | 0.39 |
| processing | 0.31 |
| transmission | 0.30 |