i wana to know about the application for single side band modulation. Why single side band suppressed carrier version of amplitude modulation is not used for the sound broadcasting and television broadcasting?
2007-07-04 06:27:04 · 3 answers · asked by khiang84 1 in Science & Mathematics ➔ Engineering
S.s.b.s.c has half the bandwith of D.s.b.s.c. You need to re-insert the carrier at the receiver. S.s.b.s.c is more prone to noise.
2007-07-04 06:34:13 · answer #1 · answered by Flash 2 · 1⤊ 0⤋
The main reason these technologies have not been used for general broadcast services is that they require a more sophisticated receiver. Some AM transmitters used SSB methodology, such as the Ampliphase which uses back to back SSB transmitters to produce a standard AM signal and the Kahn Stereo which has independent sidebands for R/L that combine in a normal AM radio to make mono audio. In both cases the carrier is not supressed to allow easier detection of the audio.
All analog methods will soon be eclipsed by digital broadcasting for TV and FM in the United States.
2007-07-04 14:31:54 · answer #2 · answered by lare 7 · 0⤊ 0⤋
Plain AM modulation produces both sidebands. 100% AM modulation removes the carrier, to save transmit power.
Single sideband removes a sideband to save half the power and bandwidth. But you have to tune your receive carrier accurately, or voices are off pitch. Television is a compromise, and uses vestigial sideband to give cheap receiver with efficient transmit power and bandwidth.
http://en.wikipedia.org/wiki/Sideband
2007-07-04 14:15:15 · answer #3 · answered by russ m 3 · 0⤊ 0⤋