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IEEE TRANSACTIONS ON AUDIO, SPEECH, AND LANGUAGE PROCESSING, VOL. 14, NO. 5, SEPTEMBER 2006 1867 On the Importance of Phase in
 

Summary: IEEE TRANSACTIONS ON AUDIO, SPEECH, AND LANGUAGE PROCESSING, VOL. 14, NO. 5, SEPTEMBER 2006 1867
On the Importance of Phase in
Human Speech Recognition
Guangji Shi, Student Member, IEEE, Maryam Modir Shanechi, and Parham Aarabi, Member, IEEE
Abstract--In this paper, we analyze the effects of uncertainty in
the phase of speech signals on the word recognition error rate of
human listeners. The motivating goal is to get a quantitative mea-
sure on the importance of phase in automatic speech recognition by
studying the effects of phase uncertainty on human perception. Lis-
tening tests were conducted for 18 listeners under different phase
uncertainty and signal-to-noise ratio (SNR) conditions. These re-
sults indicate that a small amount of phase error or uncertainty
does not affect the recognition rate, but a large amount of phase
uncertainty significantly affects the recognition rate. The degree
of the importance of phase also seems to be an SNR-dependent
one, such that at lower SNRs the effects of phase uncertainty are
more pronounced than at higher SNRs. For example, at an SNR
of 10 dB, having random phases at all frequencies results in a
word error rate (WER) of 63% compared to 24% if the phase was
unaltered. In comparison, at 0 dB, random phase results in a 25%

  

Source: Aarabi, Parham - Department of Electrical and Computer Engineering, University of Toronto

 

Collections: Computer Technologies and Information Sciences