Binaural Signal Processing Motivated Generalized Analytic Signal Construction and AM-FM Demodulation

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Venkitaraman, ArunKTH,Signalbehandling (författare)

Binaural Signal Processing Motivated Generalized Analytic Signal Construction and AM-FM Demodulation

Artikel/kapitelEngelska2014

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2014
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LIBRIS-ID:oai:DiVA.org:kth-147416
https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-147416URI
https://doi.org/10.1109/TASLP.2014.2316376DOI

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Språk:engelska
Sammanfattning på:engelska

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QC 20140701
Binaural hearing studies show that the auditory system uses the phase-difference information in the auditory stimuli for localization of a sound source. Motivated by this finding, we present a method for demodulation of amplitude-modulated-frequency-modulated (AM-FM) signals using a signal and its arbitrary phase-shifted version. The demodulation is achieved using two allpass filters, whose impulse responses are related through the fractional Hilbert transform (FrHT). The allpass filters are obtained by cosine-modulation of a zero-phase flat-top prototype halfband lowpass filter. The outputs of the filters are combined to construct an analytic signal (AS) from which the AM and FM are estimated. We show that, under certain assumptions on the signal and the filter structures, the AM and FM can be obtained exactly. The AM-FM calculations are based on the quasi-eigenfunction approximation. We then extend the concept to the demodulation of multicomponent signals using uniform and non-uniform cosine-modulated filterbank (FB) structures consisting of flat bandpass filters, including the uniform cosine-modulated, equivalent rectangular bandwidth (ERB), and constant-Q filterbanks. We validate the theoretical calculations by considering application on synthesized AM-FM signals and compare the performance in presence of noise with three other multiband demodulation techniques, namely, the Teager-energy-based approach, the Gabor's AS approach, and the linear transduction filter approach. We also show demodulation results for real signals.

Ämnesord och genrebeteckningar

TEKNIK OCH TEKNOLOGIER Elektroteknik och elektronik Signalbehandling hsv//swe
ENGINEERING AND TECHNOLOGY Electrical Engineering, Electronic Engineering, Information Engineering Signal Processing hsv//eng
Binaural processing
cosine-modulated filter-bank
demodulation
equivalent rectangular bandwidth
fractional Hilbert transform
quasi-eigenfunction approximation

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Seelamantula, Chandra Sekhar (författare)
KTHSignalbehandling (creator_code:org_t)

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Ingår i:IEEE-ACM TRANSACTIONS ON AUDIO SPEECH AND LANGUAGE PROCESSING22:6, s. 1023-10362329-9290

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