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Mobile audio services are growing with rising popularity of smart mobile devices using WiFi or cellular networks. A major issue facing mobile audio quality assessment is occasional background noises due to the prospect of sound recording at anytime and anywhere with smart mobile devices. Psychological study reveals that people pay selective attention to their interested sound in complex auditory input...
With stereo audio stepping into people's daily lives, spatial parametric technology comes to its broad prospects for development. This paper provides the audio bandwidth extension encoding and decoding devices, the bitrate of less high-frequency signal reconstruction, in order to improve the quality of the output audio signal. This research makes a contribution to the lack of existing technology,...
Vector-based amplitude panning in three dimensional sound reproduction aims to preserve both sound image direction and distance perception. While in the estimation process, the loudspeakers are supposed to place on a sphere. It is possible that this requirement cannot be met in home environment. An alternative method to estimate gain factors in vector-based amplitude panning is proposed to preserve...
In order to estimate the quality of degraded audio processed by wireless communication networks, a new paradigm has to be designed since conventional objective audio quality assessment methods such as PEAQ are not targeting at the applications. This paper presents a new intrusive objective audio quality assessment method using localized loudness difference based Jitter Distortion Measure (JDM) approach...
P2P network is a focus research field with rapid development in recent years. Distributed hash tables (DHT for short) schemes are the core technique to locate and search resources in structured P2P network. However, due to the characteristic of DHT that its hash method destroy data locality, DHT only support exact-match search, cannot support complex search process. A simple and flexible solution...
The rate control plays a very important role in video streaming applications. The current rate control scheme in the advance video coding standard H.264/AVC still results in a relatively large quality fluctuation for frame-level with higher motion activities. However, the current video coding standards remove the spatial-temporal redundancy based on the signal statistical correlation. Therefore, to...
The error concealment is an important technique in the video transmission that can assure the reconstruction video quality and can efficiently recovery the data loss and the data errors in the transmission process caused by the transmission environment, thus improve the subjective quality of the video received in the end. In order to enhance the error resilience of AVS-P2 standard, in this paper,...
Just Noticeable Difference (JND) of interaural level difference (ILD) are measured in 30 subjects with nomal hearing. Single-frequency sine tones with the frequency of 200, 500, 1000, 2000, 5000, 8000 or 12000Hz are used in the subjective listening test. The reference ILDs are 0, 3, 6, 9, 12 and 22dB, indicating 6 directions of sound sources from midline to the direction of the right ear. The results...
In the macroblock coding mode selection process, to improve the judging speed of intra macroblock refresh, the codec usually uses the previous frame temporal information and low-level SVC layer image information to prejudge to reduce the range of candidate macroblock coding modes. As the compressed bitstreams are particular sensitive to error, in order to enhance the error resilience of compressed...
With the rapid development of video communications between heterogeneous networks and video surveillance services, scalable video coding (SVC) technology is proposed to solve the fluctuation of network bandwidth and become the current research focus. Because bit error rate in wireless channel is very high, and it is the serious impact for video quality, the error concealment algorithm research of...
With the rapid development of industrialization and urbanization, crime prevention issues become serious in China each day. Although various security facilities have played a positive role in the field of crime prevention, defects exist in poorly designed systems targeting personnel protection, physical protection, and electronic protection. Therefore, it is a major strategic task to improve risk...
Frequency Domain Linear Prediction (FDLP) gives an approximation of the Hilbert envelopes of a signal. FDLP based Codec works with long temporal segments and keeps the information carried by the time-domain envelopes very well. The codec gives good quality of the reconstructed signal, but coding efficiency is not enough. Here Frequency masking is introduced to FDLP based codec to reduce the bit-rate...
With the development of economic and continuous improvement of people's living standard, many people have paid more attention to the issue of community security so that a lot of crime prevention systems are installed around the community in recent five years. How to measure the community risk scientifically and make full play to the protection effectiveness on crime prevention system is the complex...
In recent years, with the popularity of crime prevention system, which plays a positive role in the field of crime prevention. But a number of security facilities are wasted due to no risk optimization of crime prevention system. This paper firstly establishes a risk optimization model on crime prevention system. Secondly, combinatorial optimization technology is used to calculate this model. Finally,...
Nowadays, with the rapid development of social economy, the environment has become more and more complex and various events sometimes take place around universities in China. So the emergency information system should be constructed to prevent the occurrence of events and reduce economic losses in universities. In this paper, firstly, the requirements of university emergency are proposed according...
In previous papers, frequency-domain quantization noise was always treated as uniform distribution in super-resolution construction for compressed video, when at high compressed ratio, this model may introduce error. This paper provides a Laplace model of DCT coefficients whose parameters can extract from the encoder, then transfers them as side information to the decoder, and utilizes the distribution...
An efficient immittance spectral frequency (ISF) parameters quantization algorithm is proposed based on the Gaussian mixture model (GMM). The basic idea of the algorithm is the use of GMM to send the ISF parameters into M Gaussian clusters, ISF parameters are quantized by a Gaussian lattice vector quantizer corresponding to that Gaussian clustering, and the minimal spectral distortion value among...
Subjective listening tests of the spatial cues interaural time difference (ITD), interaural level difference (ILD), and interaural coherence (IC) from 20 Hz to 15500 Hz are presented. To obtain the just noticeable difference (JND) of the cues, which is an indication of spatial hearing significance, we expand raw test data by the bootstrap method. The tests show the spatial cues have frequency dependence...
In this paper, structural modifications to the current spatial stereo coding are developed, and two novel complete structures are proposed based on those modifications. Through analyzing the problems of frequency band partition, algorithmic delay, and computational complexity of the current spatial stereo coding on a structural level, 3 schemes, analysis-by-synthesis frequency band partition parallel...
Many multicast fingerprint schemes have been proposed to protect the digital content's copyright in multicast environment. In almost all of those schemes, the generation and the embedding of the fingerprint are controlled by the distributors. Since that, the accusation against the charged redistributors, who was the subscriber in some earlier transaction, is objectionable because that the distributor...
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