DSP altered feedback system for anti-stuttering applications

An altered feedback system aims to help people that suffer of stuttering and speech fluency disorder. The basic therapy approach is to modify the original voice and to present it back to his/her ear. By hearing the altered signal, he/she thinks someone else is talking the same words together, which results in a natural fluent speech. Our system modifies the voice pitch frequency and reduces background noise. The output signal produces a comfortable and natural altered feedback voice. The hardware implementation with a low-cost DSP processor presents a satisfactory real-time computational performance and low energy consumption.