Studies on Frequency Dependent Attenuation with Spectral-Shift Zero-Crossing Method
نویسندگان
چکیده
منابع مشابه
A new method for attenuation coefficient measurement in the liver: comparison with the spectral shift central frequency method.
OBJECTIVE To assess the feasibility of a new method of measuring the attenuation coefficient in the liver, which offers less variability of results than the conventional method. METHODS The attenuation coefficient was evaluated on the basis of the following equation with sound field correction: [log(M0 (z)) - tau(z)]. In our system, the attenuation coefficient was also evaluated by the spectr...
متن کاملSeismic attenuation tomography using the frequency shift method
We present a method for estimating seismic attenuation based on frequency shift data. In most natural materials, seismic attenuation increases with frequency. The high-frequency components of the seismic signal are attenuated more rapidly than the low-frequency components as waves propagate. As a result, the centroid of the signal’s spectrum experiences a downshift during propagation. Under the...
متن کاملZero-Crossing Based Demodulation of Minimum Shift Keying
Minimum shift keying (MSK) modulation has features such as constant envelope, compact spectrum and good error performance, which are all desirable in many digital applications including mobile radio. Numerous receiver structures to demodulate MSK have been suggested, such as correlation receivers, differential detectors and frequency discriminators. MSK is a form of biphase keying and can be de...
متن کاملZero-Crossing Based Time-Frequency Masking for Sound Segregation
This paper presents a new method of zero-crossing based binaural mask estimation for sound segregation under the condition that multiple sound sources are present simultaneously. The masking is determined by the estimated sound source directions using the spatial cues such as inter-aural time differences (ITDs) and inter-aural intensity differences (IIDs). In the suggested method, the estimatio...
متن کاملAdaptive Window Zero-Crossing-Based Instantaneous Frequency Estimation
We address the problem of estimating instantaneous frequency (IF) of a real-valued constant amplitude time-varying sinusoid. Estimation of polynomial IF is formulated using the zero-crossings of the signal. We propose an algorithm to estimate nonpolynomial IF by local approximation using a low-order polynomial, over a short segment of the signal. This involves the choice of window length to min...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Neurosonology
سال: 1989
ISSN: 0917-074X,1884-3336
DOI: 10.2301/neurosonology.2.81