Can anyone explain me how the balanced modulator works?

[SherlockBenedict]

I know that balanced modulator removes the carrier frequency from the Amplitude modulated input signal. Here's the circuit that I saw but I couldn't understand its working. I know the working of ring modulator so you need not explain me that.

Thanks

 

[goldberg]

Thats a SSB modulation method from a transceiver, right ?
Thomas

 

[keith1200rs]

A true multiplication of two sine waves produces the sum and difference frequencies. Neither original frequency is present.

sin(A).sin(B) = 0.5 cos(A-B) - 0.5 cos(A+B)

A ring modulator is an approximation to that, with harmonics.

Keith