This paper describes a study of the use of low order FIR filters for audio equalization. The filter frequency response is specified using a set of frequency samples and a fast algorithm is used to calculate its coefficients in real time. When the samples correspond to exactly equally spaced frequencies, a good filter is obtained. Audio equalization requires that the frequency samples are logarithmically spaces, and the direct approach gives rise to large errors. This effect is explained and an alternative approach considered. Results of simulation and real time performance analyses are also presented.
Click to purchase paper as a non-member or login as an AES member. If your company or school subscribes to the E-Library then switch to the institutional version. If you are not an AES member and would like to subscribe to the E-Library then Join the AES!
This paper costs $33 for non-members and is free for AES members and E-Library subscribers.