Electrical audio signal processing systems and devices – Including frequency control – Having crossover filter
Patent
1984-02-14
1986-05-13
Isen, Forester W.
Electrical audio signal processing systems and devices
Including frequency control
Having crossover filter
H03G 500
Patent
active
045891354
ABSTRACT:
A frequency band filtering circuit and phase shift free crossover network comprising at each crossover frequency range between band pass filters a low-pass filter means characterized by a transfer function that decays at a second or higher order function of frequency and a high-pass filter means characterized by a transfer function that rises as a second or higher order function of frequency and wherein the respective pair of transfer functions sum to unity. By employing circuit filters characterized by high order polynomial transfer functions that sum to unity, the combination of sharp roll-off and excellent frequency separation is achieved without introducing phase distortion when the signals are recombined or summed. Such a filtering system is useful in high fidelity speaker crossover systems, various electronic signal splitting or filtering circuits (whether analog or digital) wherein the information within individual frequency bands are to be isolated and treated independent of an adjacent frequency band yet ultimately recombined and the like.
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Bohn, "A Fourth-Order State Variable Filter for Linkwitz-Riley Active Crossover Designs", 74th Convention of Audio Engineering Society, Oct. 1983.
Lipshitz and Vanderkooy, "In-Phase Crossover Network Design", 74th Convention of Audio Engineering Society, Oct. 1983.
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