A modulation property of time-frequency derivatives of filtered phase and its application to aperiodicity and fo estimation

We introduce a simple and linear SNR (strictly speaking, periodic to random power ratio) estimator (0dB to 80dB without additional calibration/linearization) for providing reliable descriptions of aperiodicity in speech corpus. The main idea of this method is to estimate the background random noise level without directly extracting the background noise. The proposed method is applicable to a wide variety of time windowing functions with very low sidelobe levels. The estimate combines the frequency derivative and the time-frequency derivative of the mapping from filter center frequency to the output instantaneous frequency. This procedure can replace the periodicity detection and aperiodicity estimation subsystems of recently introduced open source vocoder, YANG vocoder. Source code of MATLAB implementation of this method will also be open sourced.Comment: 8 pages 9 figures, Submitted and accepted in Interspeech201

A view about commentaries on Li Po\u27s Ching-Yeh-Ssu in late China

北岡正子教授退休記念

780-3 Does Estrogen Reduce the Accuracy of Exercise Electrocardiography in Women?

It has been suggested that estrogen has a role in the genesis of false positive exercise electrocardiograms in women. We evaluated 1007 men and 832 women with suspected coronary artery disease concerning the accuracy of exercise electrocardiography. Women were grouped according to estrogen status (ES): ES- = postmenopausal and not on estrogen replacement and ES+ = premenopausal (Premen) or on estrogen replacement. Positive exercise ST criteria were ≥1mm horizontal/downsloping or ≥1.5 mm upsloping depression.ResultsOverall accuracy: sensitivity 44% and specificity 87%; receiver operating characteristic curve (ROC) area 76±3. The following table compares the accuracy of men and subgroups of women.NumberSensitivitySpecificityROC AreaMen100752±791±284±3Women83234±782±2*64±6*ES-31735±1279±5*61±9*ES+51515±1181±2*46±15*Premen25972±4091±5**90±14†*p<0.01 vs Men**p=0.05 vs ES+ or ES-†p<005 vs Women, ES+, or ESThe heart rate-pressure products for Men (26,600±600) and Premen (26,500±500) were the same (p=0.58).ConclusionConcerning exercise electrocardiography, both ES+ and ES- women have lower accuracy than men. However, Premen women (a subgroup of ES+) had exercise performance and accuracy similar to men, especially concerning specificity. These results suggest that not all ES+ women have the same accuracy and argue against a role for naturally occurring estrogen as an etiology for false positive results