An Efficient, Low-Noise Filter Architecture for Bass Processing on a DSP Core
Bass Enhancement is becoming popular in many forms of consumer devices. Whatever technique is used on whatever processor, the low frequency filtering involved is frequently the major determinant of system signal-to-noise ratio. The architecture described combines an efficient, cascaded, low-pass FIR filter and a poly-phase adaptation of standard low frequency IIR filtering. The resulting circuit achieves a 20 to 30dB improvement in signal to noise ratio at the cost of only 12 instructions per sample. The technique may be applied to any bass processing using fixed or floating point processors. Complete design tables for the cascaded FIR filters are given as are noise spectrum plots of the results.
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