Which of the following phone emissions uses the narrowest bandwidth?
Single sideband✓پاسخ درست
Vestigial sideband
Phase modulation
Frequency modulation
توضیح
SSB suppresses the carrier and one of the two sidebands, so its occupied bandwidth is roughly the highest audio frequency, about 3 kHz. Vestigial-sideband transmission retains part of the second sideband, while angle modulation generates many sideband pairs, so both require more spectrum.