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FinalDocumentation - Raymond Sastraputera MICROPHONE ARRAY...

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Raymond Sastraputera MICROPHONE ARRAY ECE5525 Speech Processing A.Problem Statement Microphone are used for recording incoming speech signals/ sound; however, there is a limitation to it. A speech signal will contain the signal itself and the noise. Each microphone will receive the signal based on the time, and signal’s quality is better with higher signal to noise ratio. Therefore, by using multiple microphones (or a microphone array) the signal will have much higher signal to noise ratio. B. Literature Review of various solutions 1. Beam forming The microphone can be positioned linearly such that each microphones can receive the speech signal at different time. Beam forming theory is used to process/express the relation between microphones and the source of the signal. Beam forming theory assumes that the distance of the source is much farther than the distance between microphones. So, the angle position of the signal arriving to the microphones are the same or parallel. 2. VAD Because of the time difference, the signal that arrive on each microphone should be adjusted or aligned to each other. This alignment enhance the speech signal and at the same time reduce the noise signal. To obtain this time difference, a VAD (Voice Activity Detector) is required. The VAD will be based on change in energy, and it is used to choose the start of the speech signal. After the speech signal is obtained, the signal on each microphone is shifted to be aligned properly to the referenced microphone. 3. Cross correlation One solution to obtain this is using cross correlation method. Cross correlation method calculate the multiplication of the two signal with all possible shift. The result will be an array which the size is sum of the length -1.
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C. Detailed explanation of selected solution and its implementation 1. Beam forming In the sample that is used in this project, the position of the speaker is specified:
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This note was uploaded on 02/11/2012 for the course ECE 5525 taught by Professor Staff during the Fall '10 term at FIT.

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FinalDocumentation - Raymond Sastraputera MICROPHONE ARRAY...

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