Audio visual Engineering D. C Jy f r +5. 5MHz Signal LSB USB D. C fy ilter Passband D. C fy f r+5.5MHz FSB ⅤSB USB Figure 56Figure 5b f D.C. Y fY Filter D.C. Signal LSB USB f D.C. Y VSB Signal VSB USB fY + 5.5MHz Passband fY + 5.5MHz