1. Final stage protection is included and band switched lowpass filters provide interference protection. 2. This circuit is, in fact, a basic ( first-order ) lowpass filter . 3. The algorithm used a loop gain of 0.98 with increasingly attenuating first order lowpass filters . 4. :A sinc filter is a lowpass filter ( with a really, really sharp cutoff ). 5. The lowpass filter consists of two polyphase filters, one for the decimator and one for the interpolator. 6. The Juno-60 features a rather distinctive-sounding 24 dB / octave lowpass filter with resonance. 7. Most commonly, the prototype filter is expressed as a lowpass filter , but other techniques are possible. 8. Interpolation requires a lowpass filter after increasing the data rate, and decimation requires a lowpass filter before decimation. 9. Interpolation requires a lowpass filter after increasing the data rate, and decimation requires a lowpass filter before decimation. 10. Upsampling requires a lowpass filter after increasing the data rate, and downsampling requires a lowpass filter before decimation.