an ssb-am receiver is tuned to receive a 7.225-mhz lower ssb (lssb) signal. the lssb signal is modulated by an audio signal that has a 3-khz bandwidth. assume that the receiver uses a superheterodyne circuit with an ssb if filter. the if amplifier is centered on 3.395 mhz. the lo frequency is on the high (frequency) side of the input lssb signal. (a) draw a block diagram of the single-conversion superheterodyne receiver, indicating frequencies present and typical spectra of the signals at various points within the receiver. (b) determine the required rf and if filter specifications, assuming that the image frequency is to be attenuated by 40 db.