Patent ID: 7395209

Claim:
A digital audio decoder for receiving an encoded audio signal and decoding the audio signal, the digital audio decoder comprising: an input which receives the encoded audio signal; a program memory circuit which is operable to store a program by which the digital audio decoder operates; a data memory circuit which is operable to store pre-computed calculations as operands for use in the decoding operation, the operands having an integer part and a fractional part within a fixed word length, with the division of bits between such parts having at least two formats in the data memory circuit; a control circuit connected to the input, the program memory circuit and the data memory circuit, the control circuit having a fixed-point mathematical operating system, the control circuit further being operable to decode the encoded audio signal according to the program stored in the program memory circuit, to retrieve and interpret the operands from the data memory circuit, and to calculate an unencoded audio signal based on mathematical formulas stored in the program memory circuit and based upon the further pre-computed calculations stored in the data memory circuit.