If we have an MP3 file and we decode it to an uncompressed WAV file and then later encode it to MP3 again at the same sample rate - why is it that the quality gets degraded? This is a past exam ...
Which one of the lossy file formats like Ogg, AAC, Mp3, Wma has the best quality/size ratio? I've seen that AACs are smaller than MP3 at the same bitrates. Do they sound worse than MP3?