On the Time–Frequency Detection of Chirps
نویسندگان
چکیده
The question of detecting a chirp in the time–frequency plane is addressed. Strategies based on line integration are discussed with respect to optimality and adequacy of a representation to a given chirp. Linear and power-law chirps are considered in some detail and a possible application of affine distributions to the detection of gravitational waves is proposed, together with an effective implementation by means of reassigned spectrograms. © 1999 Academic Press
منابع مشابه
Time-frequency and chirps
Chirps (i.e., transient AM-FM waveforms) are ubiquitous in nature and man-made systems, and they may serve as a paradigm for many nonstationary deterministic signals. The time-frequency plane is a natural representation space for chirps, and we will here review a number of questions related to chirps, as addressed from a time-frequency perspective. Global and local approaches will be described ...
متن کاملNewborn EEG Seizure Detection Based on Interspike Space Distribution in the Time-Frequency Domain
This paper presents a new time-frequency based EEG seizure detection method. This method uses the distribution of interspike intervals as a criterion for discriminating between seizure and nonseizure activities. To detect spikes in the EEG, the signal is mapped into the time-frequency domain. The high instantaneous energy of spikes is reflected as a localized energy in time-frequency domain. Hi...
متن کاملTime / Frequency Techniques for Signal Feature
A method for detecting linear chirps in audio signals is presented. It uses a complex uniform spaced lter bank as a basis for the detection. The lter bank has an eecient implementation, good frequency local-ization, and delivers magnitude and phase of the sub-band signals. The complex lter bank uses two parallel real valued lter banks, each with critical sampling and perfect reconstruction capa...
متن کاملA Categorization of Mexican Free-Tailed Bat (Tadarida brasiliensis) Chirps ýýýýý
Male Mexican Free-tailed Bats (Tadarida brasiliensis) attract mates and defend territory using multi-phrase songs that have a structured set of rules. A subjective view of their spectrograms shows similarity and dissimilarity between the chirps (a syllable within the song) of different males. We developed a rigorous algorithm to characterize the shapes of these chirps. The discrete Fourier tran...
متن کاملImproved Knock Detection Method Based on New Time-Frequency Analysis In Spark Ignition Turbocharged Engine
Premature combustion that affects outputs, thermal efficiencies and lifetimes of internal combustion engine is called “knock effect”. However knock signal detection based on acoustic sensor is a challenging task due to existing of noise in the same frequency spectrum. Experimental results revealed that vibration signals, generated from knock, has certain frequencies related to vibration resonan...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 1997