Antonio Servetti

Learn More
—Mobile multimedia applications, the focus of many forthcoming wireless services, increasingly demand low-power techniques implementing content protection and customer privacy. In this paper low complexity perception-based partial en-cryption schemes for speech are presented. Speech compressed by a widely-used speech coding algorithm, the ITU-T G.729(More)
The IEEE 802.11 standard currently does not offer support to exploit the unequal perceptual importance of multimedia bitstreams. All packets affected by channel errors, in fact, are simply discarded, irrespective of the position and percentage of corrupted bits. The objective of this paper is to investigate the effect of bit error tolerance in WLAN speech(More)
Mobile multimedia applications, the focus of many forthcoming wireless services, increasingly demand low-power techniques implementing content protection and customer privacy. In this paper a low-complexity, perception-based partial encryption scheme for telephone-bandwidth speech is presented. Speech compressed by a widely-used speech coding algorithm,(More)
—The " network neutrality bot " (Neubot) is an evolving software architecture for distributed Internet access quality and network neutrality measurements. The core of this architecture is an open-source agent that ordinary users may install on their computers to gain a deeper understanding of their Internet connections. The agent periodically monitors the(More)
In this paper, we analyze a standard compatible error correction technique for multimedia transmissions over 802.11 WLANs that exploits, when available, the information of previous erroneous transmissions. The basic idea is to store erroneous frames for error correction purposes. More specifically, at the receiver each bit is estimated with a majority(More)
The widespread adoption of compressed digital audio increasingly demands effective ways to conjugate ease of distribution with content protection. In this paper a low-complexity partial-encryption scheme for MPEG Audio is presented. The aim is to provide listeners with sample-quality audio material that can be upgraded to full-quality by simply acquiring a(More)
We present a fast software implementation of the MPEG-4 AAC Main and Low Complexity (LC) decoder. The reference implementation is analyzed and selected algorithms are presented to improve the performance of most of its building blocks, i.e., bitstream de-formatter, noiseless decoding, prediction, and filter-bank. The code is further optimized by means of(More)
This paper presents an experimental implementation of a low-complexity speaker recognition algorithm working in the compressed speech domain. The goal is to perform speaker modeling and identication without decoding the speech bitstream to extract speaker dependent features, thus saving important system resources, for instance, in mobile devices. The(More)
The popularity of DASH streaming is rapidly increasing and a number of commercial streaming services are adopting this new standard. While the benefits of building streaming services on top of the HTTP protocol are clear, further work is still necessary to evaluate and enhance the system performance from the perspective of the end user. Here we present a(More)
Compressed-domain automatic speaker recognition is based on the analysis of the compressed parameters of speech coders. The objective is to perform low-complexity on-line speaker recognition for VoIP in the compressed domain, without the need to decode or resynthesize the speech bitstream. In this paper, we present initial results in determining the(More)