Project in Wireless Systems 2015 (Noise cancellation in a teleconference)

Logga in till din gruppwebb

Du är inte inloggad på KTH så innehållet är inte anpassat efter dina val.

This is the official web page of the project group for the course "Project in Wireless Communication (EQ2440)" 2015. The main goal of the project is to cancel the noise in a teleconference.

Final Report

Presentation

Description of the project

It is a fact that the scenarios with phone calls involved are increasing every day. This situation implies an increase of the probability of being in a noisy scenario, especially in big cities. As a result of the discomfort that the users suffer in these noisy environments, researchers have worked with different approaches to solving this problem.

The diversity of noise nature and its sources lead the engineers to a big challenge: to develop high-performance solutions in these diverse environments. When facing noise cancellation it is very important to take into account the variability that the noise may experience, as previously said. Duration of the noise sequences (from ms to long sequences), color of the noise and stationarity are possible classications of the noise and each clasification implies different ways of treating it. Therefore, a lot of systems are using combined techniques to reach the best possible performance, which has been naturally the case of this project.

When talking about de-noising a teleconference there are two factors to take into account, techniques to cancel the noise and the possibility of their implementation in a real-time application. The real-time application has been, as expected, a big challenge because it implies good performance in terms of cancellation with the minimum reachable delay to conserve the naturalness of the conversation.

Our goal is to cancel the noise contribution in the conversation between the two speakers of the teleconferences. With the purpose to simplify the scenario, it will be assumed that only one of the speakers is surrounded by noise and the main noise source is known as well.