Adaptive Quantization for Psychoacoustic Audio Coding Using Discrete Cosine Transform-Based Dilation

An apparatus for coding an audio signal, the apparatus comprising:

• a memory storing instructions;
• and
• a processor coupled to the memory and configured to execute the instructions to cause the apparatus to:
• receive a quantized audio signal;
• generate, based on the quantized audio signal and using a first dequantization operation, at least one local maximum discrete cosine transform (DCT) coefficient;
• determine at least one masking function based on the at least one DCT coefficient;
• generate a set of modified quantized values based on applying the at least one masking function to a set of quantized values of the quantized audio signal;
• generate a dequantized audio signal by dequantizing the set of modified quantized values;
• generate a reconstructed audio signal based on the dequantized audio signal;
• and
• output the reconstructed audio signal.

A non-transitory, computer-readable medium storing instructions that, when executed, cause a processor to perform operations, comprising:

• receiving a quantized audio signal;
• generating, based on the quantized audio signal and using a first dequantization operation, at least one local maximum discrete cosine transform (DCT) coefficient;
• determining at least one masking function based on the at least one DCT coefficient;
• generating a set of modified quantized values based on applying the at least one masking function to a set of quantized values of the quantized audio signal;
• generating a dequantized audio signal by dequantizing the set of modified quantized values;
• generating a reconstructed audio signal based on the dequantized audio signal;
• and
• outputting the reconstructed audio signal.