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Precise Psychoacoustic Correction Method Based on Calculation of JND Level

100%
Piotrowski Z.
Acta Physica Polonica A
|
2009
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vol. 116
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issue 3
375-379
EN
This paper constitutes a proposal of a method of spectral shaping of the watermark signal without adjusting the interception point based directly on psychoacoustics of the human auditory system and the proposed calculation formula. The proposed calculation formula enables correction of watermark signal both as regards its spectrum shape and adjustment of watermark signal to the host's JND.
2
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Robust Algorithm for Heart Rate (HR) Detection and Heart Rate Variability (HRV) Estimation

63%
Piotrowski Z., Różanowski K.
Acta Physica Polonica A
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2010
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vol. 118
|
issue 1
131-135
EN
We present algorithm for Heart Rate detection based on Short-Term Autocorrelation Center Clipping method. This algorithm is dedicated for biological signal detection, electrocardiogram, in noisy environment with lot of artifacts. Using this algorithm is also possible detect the R pointers in the PQRST complex of the ECG signal. In this paper the new implementation of the heart rate variability estimation is also presented. HRV module is based on parametric and non-parametric methods of the power spectral density computation.
3
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Fidelity Estimation of Watermarked Audio Signals According to the ITU-R BS.1116-1 Standard

63%
Piotrowski Z., Gajewski P.
Acta Physica Polonica A
|
2012
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vol. 121
|
issue 1A
A-82-A-85
EN
The paper describes the method that enables to measure acoustic fidelity of audio signals degraded with digital watermarks. Fidelity measurements of degraded acoustic signals is suitable for such applications as distinguishing whether the acoustic record is signed with a digital watermark (watermarked) or not as well as evaluation of the degradation degree affecting the host signal. The test of subjective assessment according to the recommendation ITU BS.1116-1 is the standard that served as the basis for implementation of a dedicated application within the Matlab environment and for development of the concept how to make this application available as an IP network service to enable assessment of degraded signal by a wider auditorium.
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