microphone technique

GCC-PHAT is a straightforward method for sound source localization. This MATLAB code allows angle localization of a sound source using a linear microphone array (with an example setup of 8 microphones). The code processes continuous sound signals (.wav format) captured by the array. Multiple sources can be detected as long as each source has distinct time intervals when emitting sound, without overlapping emission periods. This code is primarily designed for introductory learning purposes. It provides a basic understanding of GCC-PHAT and includes a brief documentation for guidance. Note: It is not suitable for those seeking to perform accurate or complex localization tasks. Key Features Processes linear microphone arrays (example: 8 microphones) Localizes sound angles based on non-simultaneous multiple sources Includes a basic documentation for learning purposes This tool is ideal for beginners aiming to understand the fundamental concepts behind GCC-PHAT in sound source localization.

SMOTE（Synthetic Minority Over-Sampling Technique）函数接受维度为(r,n)的特征向量和维度为(r,1)的目标类作为输入，并返回维度为(r',n)的final_features向量和维度为(r',1)的目标类作为输出。该技术由N. Chawla、K. Bowyer、L. Hall和W. Kegelmeyer提出，用于解决数据不平衡问题。SMOTE被广泛应用于各个领域，包括机器学习和数据挖掘。详细内容可参考Arxiv预印本arXiv:1106.1813, 2011。

The rt_script.m is the main program. It generates a text file and a PDF report to log the estimated reverberation time. Two measurement methods can be used: 1) Speaker On-Speaker Off Method, and 2) Balloon Burst Method. The documentation provides basic programs for both methods. It has been found that the Speaker On-Speaker Off Method is significantly more accurate than the Balloon Burst Method. The Balloon Burst Method tends to have over 50% error below 1000 Hz. The reverb_time.m calculates the reverberation time from the 1/3 octave band time logs. Time records of random test signals, generated by the script makelNHANESNoisesm_ed.m (also available on MATLAB Central File Exchange), are ideal for measuring reverberation time using the Speaker On-Speaker Off Method. The Balloon Burst Method can be used to process the same file multiple times to roughly estimate the reverberation time for each 1/3 octave band.