A 10-band graphic equalizer, shown in Figure 5, is implemented using a TI TMS320C30-based
DSP board and an audio-frequency I/O board. Stereo data is sampled at 48 kHz, filtered by 20
bandpass filters (10 per channel), scaled by a user-selectable gain value at each frequency, and
recombined for output. All of this processing–two A/D conversions, 20 bandpass filters, 20
instantaneous power calculations, combination of the 20 bandpass outputs, and two D/A
conversions–is completed in less than the 20.83 µsec allotted by the 48-kHz I/O sampling rate.