In purpose of improving automatic speech recognition rate on embedded device, we've decided to use the FAME strategy known as "Frequency and Amplitude Modulation Encoding" proposed by Wei-Dong Wang, Hong-Yun Liu, Hu Yuan and Qing Ang in their article A New Speech Coding Strategy for Cochlear Implant which is based on the fact that speech signal can be represented as a sum of signals in given subbands and is expressed by the following equation.

$$y(t) = \sum_{k=0}^{N}{m_k(t) * \cos[2\pi\textit{f}_{c_k}(t) + \phi(t)]}$$

Where:

 $$y(t)$$ : Represent the synthesized signal. $$N$$ : The number of subbands $$m_k$$ : The $$k^{th}$$ band amplitude signal that modulate the carrier signal. $$\textit{f}_{c_k}(t)$$ : The $$k^{th}$$ band central frequency. $$\phi(t)$$ : The signal phase

we can summurise the FAME strategy with the following graphic

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