Toward an estimation of the clarinet reed pulse from instrument

9 In this work, a technique is presented for estimating the reed pulse from the pressure signal recorded at 10 the bell of a clarinet during performance. The reed pulse is a term given to the typically periodic 11 sequence of bore input pressure pulses, a signal related to the volume flow through a vibrating reed by 12 the characteristic impedance of the aperture to the bore. The problem is similar to extracting glottal 13 pulse sequence from recorded speech; however, because the glottis and instrument reeds have very 14 different masses and opening areas, the source-filter model used in speech processing is not applicable. 15 Here, the reed instrument is modeled as a pressure-controlled valve coupled to a bi-directional 16 waveguide, with the output pressure approximated as a linear time invariant transformation of the 17 product of reed volume flow and the characteristic impedance of the bore. By noting that pressure 18 waves will make two round trips from the mouthpiece to the bell and back for each reed pulse, yielding 19 a distinct positive and negative lobe in the running autocorrelation period of the recorded signal, the 20 round-trip attenuation experienced by pressure waves in the instrument is estimated and used to invert 21 the implied waveguide, producing reed pulse estimates. VC 2012 Acoustical Society of America. [http://dx.doi.org/10.1121/1.3699211] PACS number(s): 43.75.Zz, 43.75.Wx, 43.75.Ef, 43.60.Pt [TRM] Pages: 1–12