Graphic Audio Equalizer Example

Question

Anton 2023-4-11

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https://ww2.mathworks.cn/matlabcentral/answers/1945059-graphic-audio-equalizer-example

回答： jibrahim 2023-4-11

Hi,

I have found an example of Graphic Audio Equalizer as an example in CMSIS DSP library (ARM processors). (https://arm-software.github.io/CMSIS_5/DSP/html/group__GEQ5Band.html)

Description:This example demonstrates how a 5-band graphic equalizer can be constructed using the Biquad cascade functions. A graphic equalizer is used in audio applications to vary the tonal quality of the audio.

Each filter section is 4th order and consists of a cascade of two Biquads. Each filter has a nominal gain of 0 dB (1.0 in linear units) and boosts or cuts signals within a specific frequency range. The edge frequencies between the 5 bands are 100, 500, 2000, and 6000 Hz. Each band has an adjustable boost or cut in the range of +/- 9 dB. For example, the band that extends from 500 to 2000 Hz has the response shown below

The array bandGains specifies the gain in dB to apply in each band. For example, if bandGains={0, -3, 6, 4, -6}

I need help how to build this example in Matlab.