Linear prediction of formants for low bit rate digital speech transmission
چکیده
A new nethod based on linear prediction technique in transform donain is proposed in this paper to achieve low bit rate digital speech trsnsnission. Seperate processing of voiced/unvoiced sections of speech is employed.In the case of voiced sounds the first foment is chosen from the short tine sequency spectrum (i) and then a prediction coefficient is calculated using LP techniques from wh' ich the other two formants can be predicted at the receiver end. In the case of unvoiced sounds,conponents from the mid sequency spectrum region are chosen and transmitted. Computer simulation of the system using Walsh—I-Iadamard transform results in intelligible speech recovery at 1.2 Kb/s. The proposed system is simple to implement compared with existing systems of similar transmission rates.