FIELD: physics.
SUBSTANCE: method involves capture of sound represented by a numbered frame in a set of numbered frames. Additionally, the method involves frame class calculation, where a class is any of vocalised or non-vocalised class. If a frame belongs to vocalised class, a pitch (903) is calculated for the frame. If a frame has even number and belongs to vocalised class, key word of the first length is calculated by absolute quantisation of the frame pitch (910). If a frame has uneven number and belongs to vocalised class, and a reliable frame is present, then a key word of the second length is calculated by differential quantisation of the frame pitch (905). If a reliable frame is absent, a key word of the second length is calculated by absolute quantisation of the frame pitch.
EFFECT: compact presentation of information on the class and pitch for maintaining low transfer bit rate without fidelity loss and stability against link errors.
24 cl, 12 dwg
