eSAT Publishing House
A new approach to design a DAB audio decoder is introduced to improve the quality of audio at the receiver end. Integrating an MPEG-1 Layer II (MP2) decoder and Advanced Audio Coding Low Complexity (AAC LC) decoder provides basic audio decoding for DAB in FPGA. The audio frames data are generated from DAB channel decoder are stored in RAM. The bit stream Demultiplexer parses the quantized spectrum data in the audio frame and stores them in to the audio RAM. The inverse quantization block reads the quantized spectra from the audio RAM, performs the inverse quantization computations, and writes back the result to the audio RAM.