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Modular Parametric Equalizer-Filter; A New Way to Synthesize the Frequency Response

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The proposed system makes possible the synthesis of almost all types of frequency response most commonly used in disk recording, broadcasting and electroacoustics. The equalizer has nine plug-in modules that work at different frequencies. Each module can provide 1/3 of octave, 1/2 octave, 1/1 octave, band-pass or stop-band equalization (Chebyshev); or bell-shaped curves of variable frequency and variable Q; high-pass and low-pass equalization at 22-18 dB/octave and notch filtering. In this paper, the network theory which makes possible the generation of all those functions by means of the exclusive use of active parallel-networks will be analyzed. Such condition is essential to obtain an all-modular and expandable system.

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AES - Audio Engineering Society