Excitation vector generator, speech coder and speech decoder

Abstract

An excitation vector generator includes an input vector provider configured to provide an input vector having at least one pulse, each pulse having a pre-determined position and a respective polarity. An arranger is configured to arrange a waveform in accordance with the position and the polarity of the pulse. A shape of the waveform comprises a pulse-like shape and a length of the waveform is shorter than a length of a sub-frame.

1 . An excitation vector generator, comprising: 
 an input vector provider configured to provide an input vector having at least one pulse, each pulse having a pre-determined position and a respective polarity; and    an arranger configured to arrange a waveform in accordance with the position and the polarity of the pulse,    wherein a shape of the waveform comprises a pulse-like shape and a length of the waveform is shorter than a length of a sub-frame.    
   
   
       2 . The excitation vector generator of  claim 1 , wherein the input vector is provided from an algebraic codebook table.  
   
   
       3 . A method of generating an excitation vector used in a speech encoder or decoder, the method comprising: 
 providing an input vector, having at least one pulse, each pulse having a pre-determined position and a respective polarity; and    arranging a waveform in accordance with the position and the polarity of the pulse,    wherein a shape of the waveform comprises a pulse-like shape and a length of the waveform is shorter than a length of a sub-frame.    
   
   
       4 . The method of generating an excitation vector used in a speech encoder or decoder according to  claim 3 , 
 wherein the input vector is provided from an algebraic codebook table.