Methods and apparatus for analog to digital conversion

Communications: electrical – Audible indication – Percussion-type sound producer

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

73517AV, A03K 1320, G01P 1508

Patent

active

046834567

ABSTRACT:
Methods and apparatus are described for generating a digital representation of an analog condition. In one method high-frequency digital signals are generated with the frequency of each signal being constant and the frequencies bearing a harmonic relationship one to the other. A representation of the analog condition is applied to cause a shift in phase in at least one of the digital signals. The digital signals are then compared to obtain a measure of the phase shift which is utilized to adjust the phase of the phase shifted signal toward its original phase condition. As a result of the measure of phase shift, there is generated a single weighed digital function which is representative of the amplitude of the adjustment utilized to return the phase shifted signal toward its original phase shifted condition. The single weighed digital function is applied to a low-pass digital filter to produce a multi-bit digital word representative of the instantaneous value of the analog condition.
Apparatus of invention comprises a pair of oscillators whose frequencies are constant, harmonically related to one another and whose outputs are time spaced digital pulses. An analog condition responsive means has applied thereto the aforesaid pulses to effect a relative phase shift between the digital pulses and a phase comparator measures the relative phase shift. Means are provided responsive to the measure of the relative phase shift to return the digital pulses toward an in-phase relationship, and in so doing, there is produced a single weighed digital function representative of the measure of the relative phase shift.
A new and improved geophone is described.

REFERENCES:
patent: 3274497 (1966-09-01), Zimmerman
patent: 3623072 (1971-11-01), Pohlman
patent: 3896299 (1975-07-01), Rhodes
patent: 4057796 (1977-11-01), Hoogendorn

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Methods and apparatus for analog to digital conversion does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Methods and apparatus for analog to digital conversion, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Methods and apparatus for analog to digital conversion will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-2036782

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.