通过试验比较了传统的独立分量分析(ICA)和变分贝叶斯独立分量分析(VbICA)在源信号分离中的能力,试验研究表明,无噪声环境下的盲源分离,两种方法都能得到很好的分离性能.然而,噪声环境下的源信号分离,变分贝叶斯独立分量明显优于传统独立分量分析,特别是随着噪声的增强,变分贝叶斯独立分量的优势就越明显.另外,变分贝叶斯独立分量可以估计源信号的数目,而传统独立分量分析往往事先假设源信号的个数已知,否则无法进行源信号分离.
The capabilities of blind source separation (BSS) with the traditional independent component analysis(ICA) and with variational Bayesian independent component analysis(VbICA) were discussed and verified by the experiment, The experimental results show that both methods can give a satisfactory separation performance in a noise-free BSS. However the VbICA method is superior to the traditional ICA method in the noise BSS, especially in the lower signal-to-noise BSS. In addition, the VbICA method can estimate the optimal number of source signals. However the number of source signal is always assumed to be known in the traditional ICA, otherwise the source signals can not be separated.