Use of TCP/IP Protocols for Algorithm Control in Real-Time Digital Audio Signal Processing

Tato bakalářská práce se zabývá návrhem protokolu pro řízení číslicového zpracování signálů pomocí komunikačních sítí TCP/IP. Využití tohoto protokolu v embedded jednotkách pro zpracování zvukového signálu umožní dálkové řízeného číslicového zpracování zvukových signálů v reálném čase. Knihovna, o které pojednává tato práce, umožňuje kvalitní a bezchybný přenos dat a tedy spolehlivé řízení zpracování zvukových signálů na velké vzdálenosti po lokální síti či internetu. Je však koncipovaná pro přenos libovolného typu dat a tak může nalézt i jiné uplatnění.This thesis deals with design of protocol for control of digital audio signal processing over TCP/IP networks. The application of this protocol in embedded audio processing units allows to remote control of real-time processing of digital audio signals. The library, this thesis disserts on, allows for superior and faultless transfer of data and accordingly reliable control of audio signal processing at long distances via the local network or Internet. This library is designed to transfer any type of data and can be applied in any sphere.

A novel non-intrusive objective method to predict voice quality of service in LTE networks.

This research aimed to introduce a novel approach for non-intrusive objective measurement of voice Quality of Service (QoS) in LTE networks. While achieving this aim, the thesis established a thorough knowledge of how voice traffic is handled in LTE networks, the LTE network architecture and its similarities and differences to its predecessors and traditional ground IP networks and most importantly those QoS affecting parameters which are exclusive to LTE environments. Mean Opinion Score (MOS) is the scoring system used to measure the QoS of voice traffic which can be measured subjectively (as originally intended). Subjective QoS measurement methods are costly and time-consuming, therefore, objective methods such as Perceptual Evaluation of Speech Quality (PESQ) were developed to address these limitations. These objective methods have a high correlation with subjective MOS scores. However, they either require individual calculation of many network parameters or have an intrusive nature that requires access to both the reference signal and the degraded signal for comparison by software. Therefore, the current objective methods are not suitable for application in real-time measurement and prediction scenarios. A major contribution of the research was identifying LTE-specific QoS affecting parameters. There is no previous work that combines these parameters to assess their impacts on QoS. The experiment was configured in a hardware in the loop environment. This configuration could serve as a platform for future research which requires simulation of voice traffic in LTE environments. The key contribution of this research is a novel non-intrusive objective method for QoS measurement and prediction using neural networks. A comparative analysis is presented that examines the performance of four neural network algorithms for non-intrusive measurement and prediction of voice quality over LTE networks. In conclusion, the Bayesian Regularization algorithm with 4 neurons in the hidden layer and sigmoid symmetric transfer function was identified as the best solution with a Mean Square Error (MSE) rate of 0.001 and regression value of 0.998 measured for the testing data set

Fault detection and isolation of malicious nodes in MIMO Multi-hop Control Networks

A MIMO Multi-hop Control Network (MCN) consists of a MIMO LTI system where the communication between sensors, actuators and computational units is supported by a (wireless) multi-hop communication network, and data flow is performed using scheduling and routing of sensing and actuation data. We provide necessary and sufficient conditions on the plant dynamics and on the communication protocol configuration such that the Fault Detection and Isolation (FDI) problem of failures and malicious attacks to communication nodes can be solved.Comment: 6 page