Effects processing on audio subband data
Scott Levine · 1996
This paper will show that computing standard audio effects algorithms such as reverberation, echo, chorus and flange will use less memory and computations when performing the operations on the critically sampled subband data than on the fullrate time domain signal. Not only can effects in the subband domain be obtained to sound close to the effects in the time domain, but new types of effects are now possible because different effects can be placed in separate subbands. The MPEG Audio filter bank, which also splits the audio into subbands, is used in this discussion to show that standard MPEG audio decoders could easily be augmented to include effects processors as well. 1 Introduction Since the MPEG Audio (layers I,II) standard has become a prominent data compression algorithm in the consumer multimedia market, it exists on many platforms ranging from personal computers to workstations to video games. For most of these applications, some sort of audio post-processing is desired by th...