Antonio Buffa’s scientific contributions

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Publications (1)


Pitch of Dichotic Complex Tones With a Mistuned Frequency Component
  • Chapter

December 1992

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7 Reads

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12 Citations

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Antonio Buffa

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Dierdre Williams

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Valter Ciocca

When a single harmonic of a complex sound is mistuned, it influences the pitch of the complex unless it is mistuned by more than about 8% (Moore et al., 1985). We have investigated how the mistuning of a single component influences the pitch of two simultaneous complex tones, with harmonic frequencies close to those of the single mistuned component. Specifically we have asked whether a harmonic that is exactly in tune with one harmonic series (eg 600 Hz to a 200 Hz fundamental) can still contribute to the pitch of another complex tone (eg 145 Hz fundamental) for which it is mistuned. Our experiment employed a pitch-matching task and used 410ms duration sounds. In an earlier experiment using binaural tones (Darwin et al., 1990) a 200 Hz series (first 12 harmonics) was paired with either a 145 or 155 Hz series, with the third harmonic of the 200 Hz series and the fourth harmonic of the other series being replaced by a single tone of variable frequency. Its results showed that a single harmonic could contribute to the pitch of both simultaneous complex tones; it was not ‘captured’ by the series for which it is most in tune. In the experiment reported here the complex tones are presented dichotically with a single mistuned component going to one ear. Subjects matched the pitches on the two ears in different sessions. The results showed that the mistuned component can still influence the pitch of the complex in the opposite ear, even when it is in tune with the series on its own ear, although it makes less of contribution than when it is on the same ear. The experiment also presents a single harmonic series to one ear, and a single mistuned component on either the opposite ear or the same ear. Again the contribution of the contralateral tone is less than that of the ipsilateral tone. Comparison of the single and double conditions shows that there is some tendency for one harmonic complex to capture a tone from another, when it is more in tune with the first.

Citations (1)


... Some of the studies addressing the question of the integration time for residue pitch exploited the fact that shifting the frequency of a single harmonic in an otherwise harmonic complex tone can lead to a shift in the residue pitch of the complex even when the amount of the mistuning is so large that the mistuned harmonic is heard out as a separate tone ( Moore et al., 1985;Moore et al., 1986). The largest shifts in residue pitch have been found when the frequency of the mistuned harmonic is shifted by about 3% from its harmonic value ( Moore et al., 1985;Darwin et al., 1992). Ciocca and Darwin (1999) compared the size of the shifts in residue pitch obtained for a mistuned component presented simultaneously with the remainder of the complex with that obtained when the mistuned component was presented immediately after the remainder of the complex. ...

Reference:

Reduced contribution of a nonsimultaneous mistuned harmonic to residue pitch: The role of harmonic number (L)
Pitch of Dichotic Complex Tones With a Mistuned Frequency Component
  • Citing Chapter
  • December 1992