Abstract: A novel precise method of time-frequency analysis is presented. In the algorithm, a new energy distribution is estimated by simultaneously discard or displacement of the classical spectrogram energy. A channelized instantaneous frequency and a local group delay are used in order to replacement in the same manner as formulated by Kodera et al. Additionally, new representations: a channelized instantaneous bandwidth and a local group duration are used in order to remove some part of irrelevant energy. A newly obtained energy distribution called essential spectrogram is highly concentrated and signal mono-components are precisely localized in the time-frequency domain.