Adaptive antennas : concepts and performance by R. T. Compton

By R. T. Compton

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However, the detection process is more complex for SSB signals because a local carrier must be generated to mix with the incoming sideband in order to recover the original information-carrying signal. While this is simple today, it wasn't when the NTSC system was being developed and so was rejected. 14(a). 2 MHz. 14(b). In order to correct for this, the modulated signal must be passed though a compensating filter before detection. 14(c). 3 Video Bandwidth When the NTSC system was being designed, a tremendous number of human visual experiments were undertaken.

Amplifiers with increased bandwidths to handle the required frequency range . Amplifiers with increased power-handling capability, and thus reduced intermodulation distortion, for a given output power level and number of channels . Cables with reduced loss, both through improved dielectric materials and through the use of larger sizes of conductors with reduced ohmic losses Though increased gain might be thought of as an improvement, because fewer amplifiers would be required for a given distance, higher-gain amplifiers would have to operate with either reduced input levels (and thus contribute more noise) or higher output levels (and thus contribute higher intermodulation distortion).

Clearly, ways of reducing the bandwidth had to be found that did not impair perceived picture quality. One of the earliest signal compression techniques involved modifying the scanning system. Sixty pictures per second are required in television because picture tube technology could produce pictures bright enough to watch in daylight with the window drapes open without apparent flicker. 2 MHz of baseband bandwidth. 6 Interlaced scanning to reduce flicker while conserving bandwidth. 6. 5 lines each.

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