Digital filter

Details Digital filter Digital filter

1977-08-12

1979-01-30

Heyman, John S.

328112, 328127, H03K 110

Patent

active

041375041

ABSTRACT:
A circuit for filtering electrical waveforms in which the useful information is contained in patterns and spacing of zero-voltage crossings is disclosed. Illustratively, a disk memory system is disclosed in which the voltage peaks developed by the disk memory read-transducers are converted into zero-voltage crossing waveforms by differentiation. To eliminate false zero-voltage crossings caused by noise, the digital filter generates a linear ramp waveform whose magnitude is proportional to the time duration between successive zero-voltage crossings. False zero crossings typically have a short time duration between successive crossings. They are eliminated from the integrated ramp waveform by a comparator which only responds when the integrated waveform reaches a predetermined threshold level indicating the time between successive zero-voltage crossing exceeds a minimum time duration. A balanced version of the digital filter circuitry is also disclosed which recovers a limited, filtered version of the original zero-voltage crossing wave form except for a slight delay.

REFERENCES:
patent: 3138759 (1964-06-01), Thompson
patent: 3231823 (1966-01-01), Garfield et al.
patent: 3600688 (1971-08-01), Booth
patent: 3822385 (1974-07-01), Kayalioglu
patent: 4030010 (1977-06-01), Schwartz

Affiliated with

Also associated with

Rating

Digital filter does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Digital filter, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Digital filter will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1152745