Short Time DFTのヒルベルト変換への適用とその特性

Abstract

Hilbert transformers have been keenly studied with putting emphasis on digital signal processing of SSB or RZ SSB modulation to avoid frequency occupancy increase over radio channels. By employing instantaneous spectrum concept, a nobel Hilbert transformer named by "Short Time DFT Hilbert Transformer" is successfully realized over the frequency domain without any distortion both in amplitude and phase-shifting. This nobel transformer is also discussed to prevent its functional precision from synchronization error which occurs either between analyzer and synthesizer within the nobel transformer or between two transformers installed at sending and receiving sites in radio communication systems.