Unit:
Κατεύθυνση / ειδίκευση Επεξεργασία-Μάθηση Σήματος και Πληροφορίας (ΕΜΠ)Library of the School of Science
Supervisors info:
Αλέξανδρος Ελευθεριάδης Αναπλ. Καθηγητής
Original Title:
Εκτίμηση καθυστέρησης με υψηλή ακρίβεια κατά την μετάδοση ήχου σε συστήματα πραγματικού χρόνου χρησιμοποιώντας μη ακουστά πιλοτικά σήματα
Translated title:
Real-time high-resolution delay estimation in audio communication using inaudible pilot signals
Summary:
We describe the construction of inaudible pilot signals and associated receiver
processing techniques that can be used in audio communication, so that an
accurate
estimation of the signal’s end-to-end delay can be obtained. Considering the
properties of
the human auditory system, we structure the pilot signal so that it is
acoustically
untraceable and maximizes the time accuracy of the delay estimation. Analysis
and
mathematical modeling of our system is given, including using modulation
techniques,
pulse designs that could be adopted, receiver’s processing and calculation of
Power
Spectral Density of the pilot signals that are finally proposed. We provide
simulation
results verifying the effectiveness of the techniques, and also demonstrate
their
superiority compared to systems with widely used pulses in similar schemes. The
probability of error is derived assuming accuracy in the order of one sample.
We also
examine their performance under compression of the complex audio signal, and
finally,
we explore the capabilities of the system requiring fractional delay
estimation.
Keywords:
delay estimation, Ιnaudible pilot signal, Ρeal-time systems, Μultimedia - audio, Νetwork music performance
