Design of a Digital Octave Band Filter
Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
This report describes the design and implementation of a fixed audio equalizer based on a scheme where parts of the signal spectrum are downsampled and treated differently for the purpose of reducing the computational complexity and memory requirements. The primary focus has been on finding a way of taking an equalizer based on a simple minimum-phase FIR filter and transform it to the new type of equalizer. To achieve this, a number of undesireable effects such as aliasing distortion and upsampling imaging had to be considered and dealt with. In order to achieve a good amplitude response of the system, optimization procedures were used.
As part of the thesis, a cost-effective implementation of the filter has been made for an FPGA, in order to verify that the scheme is indeed usable for equalizing an audio signal.
Place, publisher, year, edition, pages
2012. , 59 p.
Digital filters, multirate filtering, audio processing
IdentifiersURN: urn:nbn:se:liu:diva-79231ISRN: LiTH-ISY-EX--12/4581--SEOAI: oai:DiVA.org:liu-79231DiVA: diva2:539356
Subject / course