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Article: Lowpass, 30-kHz Bessel filter offers high performance for audio applications.(design ideas: READERS SOLVE DESIGN PROBLEMS)
- Article from:
- EDN
- Article date:
- February 16, 2006
- Author:
CopyrightCOPYRIGHT 2006 Reed Business Information, Inc. (US). This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan. All inquiries regarding rights should be directed to the Gale Group. (Hide copyright information)
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Thanks to its property of applying an equal amount of delay to all frequencies below its cutoff frequency, the Bessel linear-phase filter sees service in audio applications in which it's necessary to remove out-of-band noise without degrading the phase relationships of a multifrequency in-band signal. In addition, the Bessel filter's fast step response and freedom from overshoot or ringing make it an excellent choice as a smoothing filter for an audio DAC's output or as an antialiasing filter for an audio ADC's input. Bessel filters are also useful for analyzing the outputs of Class D amplifiers and for eliminating switching noise in other applications to improve accuracy ...
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