![]() ![]() It computes new Huffman tables for each audio signal and stores them in the compressed binary file as side information.įor experimentation, different numbers of subbands can be tried for different signals, and the resulting audio quality and bit rate can be compared. It uses an MDCT filter bank with 1024 subbands (can be set in file audio_encoder.py on line 48 and on line 27 in audio_decoder.py) with a sine window, a psycho-acoustic model with non-linear superposition, and Huffman coding. Observe that there is no inherent limit on the sampling rate and quality setting, for experimenting. The resulting bit rate is around 1.5 bits/sample for quality around 100%. ![]() The audiofile could be the included test48khz.wav for testing. ![]() It writes the compressed signal to file audiofile.acod. To reduce the quantization error and increase the quality, but also increase bit rate.įor multi-channel audio signals, like stereo, it encodes the channels separately. For higher values, the masking threshold is lowered accordingly, Where quality is an optional quality argument.ĭefault is quality=100 as 100%. The audio coder includes Huffman coding and writing a binary compressed fileĬopy the directory to a local directory with: This is a Python implementation of an audio coder, for teaching purposes.
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