Nippon Telegraph and Telegraph Corporation

Shigeaki Ogose

Kazuhiro Daikoku

A SSB (single sideband) single accompanied by a carrier component is demodulated by the following process: If the carrier level in receiving signals is lower than the SSB signal's, the carrier must be amplified up to the level which is higher than that of the SSB signal. Amplitude variations of SSB signals are completely removed by an amplitude limiter. The output of the amplitude limiter is demodulated by a frequency detector and an equalizer which makes the frequency response flat. A linearizer is employed for demodulated signals to eliminate higher order distortions of the signal. The linearizer may be omitted when a pre-distortion circuit is introduced in a transmitter of the system.

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Tokyo, Japan

Shigeaki Ogose