An Efficient Solution of Phase Interferometry Ambiguity using Zero-Crossing Technique

Absolute Calibration of Hydrophones Using Heterodyne Interferometry and Zero-crossing Signal Demodulation

The current primary method for hydrophone calibration is the three-transducer spherical-wave reciprocity at NPL, covering the frequency range between 1 kHz up to 500 kHz with expanded uncertainties as low as ± 0.5 dB. Optical methods can provide an alternative method for primary calibration as they directly measure the acoustic particle velocity at a specific point in the field. The hydrophone ...

Crossing technique in cowpeas

Noise Suppressor using Zero Phase Signal and Accumulated Spectrum Technique

This paper proposes a wide-band noise reduction method using temporal accumulated spectrum and zero phase (ZP) signal. In the previous study, we replace the ZP signal around the origin with the ZP signal in the second or latter period to get an estimated speech ZP signal. For very low SNR environment, reliable period estimation is difficult. This paper presents a study of period estimation in n...

Zero-crossing analysis technique in speech and speaker recognition

The resul ts of previous studies showed a possibili ty of application of zero-crossing rates as parameters for speech and speaker recognition The paper presents a method for obtaining these parameters and the resul ts of experiments carried out in order to estimate the absolute and relative discriminating power of zero-crossing parameters in speech and speaker recogni tion. As a basic test mate...

QRS Detection Using Zero Crossing Counts

The importance of QRS detection results from the wide use of the timing information of this component, e.g., in heart rate variability analysis, ECG classification, and ECG compression. In most cases, the temporal location of the R-wave is taken as the location of the QRS complex. Missed or falsely detected beats are problematic in all of these applications and may lead to poor results. The lit...