These frequency lines can be considered as difference frequencies caused by Jupiter and Saturn ( 9.9 ) and Venus and Earth ( 11.7 ).
22.
The difference frequency is then amplified and filtered in an'intermediate frequency'or i . f . amplifier before being converted back to audible frequencies again.
23.
If the idler wave is given from the outside along with the pump beam, then the process is called difference frequency generation ( DFG ).
24.
If this difference frequency is the same as the symbol rate, the integral will be zero . talk ) 20 : 41, 15 October 2008 ( UTC)
25.
For very high ( mixer with the signal from a local oscillator, producing a signal at the difference frequency, which is low enough to be measured directly.
26.
A perfect multiplier only produces mixer products at the sum and difference frequencies, but more general nonlinear functions produce higher order mixer products : for integers and.
27.
If you and another person whistle the same note, and one of you lets his note go slightly sharp or flat, you will hear the beat, which is the difference frequency.
28.
Multiplication of the intermediate frequency with the input signal creates images centered at the sum and difference frequency ( which follows from the frequency shifting properties of the Fourier transform ).
29.
In such a radio receiver, a local oscillator ( LO ) is used to heterodyne or " beat " against the incoming radio frequency ( RF ), generating sum and difference frequencies.
30.
The sum and difference frequencies of the modulators'outputs are played back over four groups of loudspeakers, but the degree of modulation is controlled by potentiometers in order to produce gradations of transformation.
