Concept for encoding of information

摘要

The invention provides an information encoder for encoding an information signal (IS), the information encoder (1) comprising:
an analyzer (2) for analyzing the information signal (IS) in order to obtain linear prediction coefficients of a predictive polynomial A(z);
a converter (3) for converting the linear prediction coefficients of the predictive polynomial A(z) to frequency values f 1 ...f n of a spectral frequency representation of the predictive polynomial A(z), wherein the converter (3) is configured to determine the frequency values f 1 ...f n by analyzing a pair of polynomials P(z) and Q(z) being defined as P z = A z + z - m - l �¢ A �¢ z - 1
and Q z = A z - z - m - l �¢ A �¢ z - 1 ,
wherein m is an order of the predictive polynomial A(z) and I is greater or
equal to zero, wherein the converter (3) is configured to obtain the frequency values (f 1 ...f n ) by establishing a strictly real spectrum (RES) derived from P(z) and a strictly imaginary spectrum (IES) from Q(z) and by identifying zeros of the strictly real spectrum (RES) derived from P(z) and the strictly imaginary spectrum (IES) derived from Q(z);
a quantizer (4) for obtaining quantized frequency (f q1 ...f qn ) values from the frequency values (f 1 ...f n ); and
a bitstream producer (5) for producing a bitstream comprising the quantized frequency values (f q1 ...f qn ).