suppressed carrier การใช้

• While these suppressed carrier transmissions are efficient in terms of transmitter power, they require more sophisticated receivers employing envelope detection.
• The name " suppressed carrier " comes about because the carrier signal component is suppressed it does not appear in the output signal.
• For a color TV to recover hue information from the color subcarrier, it must have a zero phase reference to replace the previously suppressed carrier.
• Suppressed carriers are often used for single sideband ( SSB ) IBAC digital radio ( namely Digital Radio Mondiale ) seems likely to make this irrelevant.
• In the Armstrong method, the audio signal and the radio frequency carrier signal are applied to the balanced modulator to generate a double sideband suppressed carrier signal.
• The output from the balanced modulator is a double sideband suppressed carrier signal and it contains all the information that the AM signal has, but without the carrier.
• FM stereo transmissions use a double-sideband suppressed carrier ( DSBSC ) signal from a stereo generator, together with a pilot tone of exactly half the original carrier frequency.
• Where channelization is used, the USB suppressed carrier frequency ( a . k . a .'dial'frequency ) is normally 1.5 kHz below the quoted channel frequency.
• All long haul " channel groups " used the single-sideband / suppressed carrier heterodyne scheme that was produced by a Western Electric Type A-1 through A-6 channel bank.
• Thus there is a great advantage in efficiency in reducing or totally suppressing the carrier, either in conjunction with elimination of one sideband ( single-sideband suppressed-carrier transmission ) or with both sidebands remaining ( double sideband suppressed carrier ).
• By synchronizing an oscillator with the colorburst at the back porch ( beginning ) of each scan line, a television receiver is able to restore the suppressed carrier of the chrominance ( color ) signals, and in turn decode the color information.
• In addition, the FCC continues to require that all digital transmissions be centered on the channel-center frequencies, which the Report and Order defines as being 1.5 kHz above the suppressed carrier frequency of a transceiver operated in the Upper Sideband ( USB ) mode.
• In the picture shown below we see four peaks, the two peaks below 5000 Hz are the lower sideband ( LSB ) and the two peaks above 5000 Hz are the upper sideband ( USB ), but there is no peak at the 5000 Hz mark, which is the frequency of the suppressed carrier.