Sixth-Order Butterworth Low-Pass Filter
Low-pass filters are widely used in the audio domain. Their most important application is in communication receivers and communication audio circuitry. These filters, when used for audio communications, start attenuating frequencies above 3.4 kHz, as the bandwidth of the human voice (as far as voice clarity and intelligibility are concerned) is 300 Hz to 3.4 kHz.Here we describe a low-pass filter that exhibits a flat passband and attenuation rate of 120 dB per decade after 3.4 kHz. This means that a signal with a frequency of 34 kHz is attenuated by 120 dB compared to a signal of 3.4 kHz. No ripples are seen in the passband and stopband. A filter with flat passband and ripple-free attenuation band is known as a ‘Butterworth’ filter.
SOURCE:EFY
No comments:
Post a Comment