Antialiased soft clipping using an integrated bandlimited ramp

Fabian Esqueda , Vesa Välimäki, Stefan Bilbao

Tutkimustuotos: Artikkeli kirjassa/konferenssijulkaisussaConference contributionScientificvertaisarvioitu

Abstrakti

A new method for aliasing reduction in soft-clipping nonlinearities is proposed. Digital implementations of saturating systems introduce harmonic distortion which, if untreated, gets reflected at the Nyquist limit and is mixed with the signal. This is called aliasing and is heard as a disturbance. A new correction function, derived by integrating the bandlimited ramp function, is presented. This function reduces the level of aliasing distortion seen at the output of soft clippers by quasi-bandlimiting the discontinuities introduced in the second derivative of the signal. The proposed method increases the quality of the signal by attenuating those aliased components that lie on the lower end of the spectrum, which are known to be perceptually important. The four-point version of the algorithm reduces aliasing at low frequencies by up to about 50 dB. This work extends our understanding of aliasing in nonlinear systems and provides a new tool for its suppression in virtual analog models.

AlkuperäiskieliEnglanti
OtsikkoProceedings of the 24th European Signal Processing Conference, EUSIPCO 2016
KustantajaIEEE
Sivut1043-1047
Sivumäärä5
Vuosikerta2016-November
ISBN (elektroninen)9780992862657
DOI - pysyväislinkit
TilaJulkaistu - 28 marrask. 2016
OKM-julkaisutyyppiA4 Artikkeli konferenssijulkaisuussa
TapahtumaEuropean Signal Processing Conference - Budapest, Unkari
Kesto: 28 elok. 20162 syysk. 2016
Konferenssinumero: 24
http://www.eusipco2016.org/

Julkaisusarja

NimiEuropean Signal Processing Conference
KustantajaInstitute of Electrical and Electronics Engineers, Inc.
ISSN (painettu)2219-5491
ISSN (elektroninen)2076-1465

Conference

ConferenceEuropean Signal Processing Conference
LyhennettäEUSIPCO
Maa/AlueUnkari
KaupunkiBudapest
Ajanjakso28/08/201602/09/2016
www-osoite

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