DAGA 2010 - Deutsche Gesellschaft für Akustik eV

290 DAGA 2010 Programm
Donnerstag Musikalische Akustik (Poster)
Sound Generation in a Piano: Multichannel Measurements
M. Kappel a ,M.Abel a , R. Gerhard a und R. Bader b
a University of Potsdam; b Musikwissenschaftliches Institut der Universität
Hamburg
Different types of vibrations produced by a grand piano were recorded
simultaneously with a multichannel measurement. The aim is to investigate
the characteristics of a piano such as the correlation function between
certain vibrations and the nature of sound wave transmission within
the instrument. The data aquisition of the vibrations was carried out
by three different means: 1) self-constructed poleshoes placed over the
piano strings, 2) piezo-crystals located at the piano bridge and on the
resonance board and 3) a single capacitor microphone positioned over
the instrument. The transfer and correlation functions of sound waves
are calculated for various parts of the piano, which are crucial for the
tone generation.
Donnerstag Musikalische Akustik (Poster)
Nasality in musical Sounds - it is not a band
I. Malhotra und R. Mores
HAW Hamburg
‘Nasality‘ is one of the attributes that is used often in sound quality assessments
of musical instruments. Nasality is usually believed to be represented
by a good portion of energy in a specific band around 1 kHz.
Especially the strings community keeps referring to this band as the nasality
band according to Dünnwald’s definition in the 1980s, with only little
support from psychoacoustic tests however. Findings from two other
research fields contradict Dünnwald’s definition. Clinical studies list several
key ingredients to nasality, most of which are placed well outside
the defined band. Moreover, the speech processing community investigates
formant compositions including secondary formants rather than
energy in the mentioned band. In general, a larger set of ingredients in a
sound will add to the perception of nasality. This paper gives a brief survey
on the different approaches to nasality. It also reviews the progress
on automated feature extraction for this sound attribute.