1. KONDOZ, A.M.: Digital speech coding for low bit rate communication systems, (Wiley, Chichester 1994), p. 42–53p. 116–140
2. `TMS320C54x User's guide'. Literature number SPRU131B, Texas Instruments Digital Signal Processing Products, Michigan, 1995
3. SEGOVIA-MART́NEZ, M.: ‘DSP implementation of a speech codec’, 1998, MSc dissertation, University of Surrey, Department of Electrical Engineering
4. PORAT, B.: A course in digital signal processing, (Wiley, USA 1997), p. 526–533