 Camouflage sheet and method for manufacturing the same |
| What I claim is: 1. A method of manufacturing a camouflage sheet bearing an overall camouflage ... |
|
| Thermoplastic electrode ink for the manufacture of ceramic multi-layer capacitor |
| What is claimed is: 1. A ceramic multi-layer capacitor comprising a plurality of layers of a ... |
|
| Method of improving adhesion to plastic substrates |
| What I claim is: 1. A method for improving the adhesion of an acrylate ester or methacrylate ester ... |
|
| Process for electrolytic recovery of zinc from zinc sulfate solutions |
| According to the present invention current supply is increased by carrying out the electrolysis ... |
|
| Radiograph identifying means |
| The invention is based on the concept of indenting the desired identifying characters into a lead-... |
|
| Stable emulsion and method for preparation thereof |
| What is claimed is: 1. An emulsion having a continuous and discontinuous phase comprising: A. water;... |
|
| Thermosetting compositions |
| We claim: 1. A thermosetting composition comprising: (a) 100 parts by weight of an O.sub.2 or CO.... |
|
| Magnetic recording media |
| OF THE INVENTION In the present invention, the amount of DBP oil absorbed is the amount in m.... |
|
| Magnetic recording medium |
| OF THE INVENTION The present inventors have markedly improved the storage stability ... |
|
| Accelerated curing method for solid propellants |
| I claim: 1. An accelerated curing method for curing solid propellant in propellant tubes for use in ... |
|
|
Method for producing analog-to-digital conversions
| Details |
Inventors: LaBrie, Paul J.;
Assignee: Semiconductor Circuits, Inc. (Haverhill, MA)
Primary Examiner: Sloyan; Thomas J.
Assistant Examiner:
Attorney, Agent or Firm: Morse, Altman, Oates & Bello
Analog signals are converted into digital form in a reproducible, accurate and stable manner. The tri-dual phase technique involves the conversion of the condition to be measured, and typically represented by a voltage, first to a reference level and then to an unknown level in a dual phase conversion, and then solving for the unknown level once the relationship of the reference level, the unknown high input level, and the unknown low input levels are established. A circuit capable of carrying out the technique includes an integrator receiving voltage input signals from a switching device adapted to switch to three different input signals, including a high unknown signal level, a low unknown signal level, and a known signal reference level. The reference level is also fed into a comparator which receives the output of the integrator. Calculating circuitry is provided for the output of the comparator for processing the output and presenting the results thereof in a digital display format or other digital output. |
|
DETAILED DESCRIPTION This invention features a novel method and associated circuitry for converting an analog value in a tri-dual phase technique involving the making of three dual phase measurements to perform one conversion to a digital value.
This method comprises the combining of each side of the unknown analog value with the known reference analog value, and each combination is converted into a number of counts that are directly proportional to an analog reference level.
The known reference analog value is then converted into a number of counts that are also directly proportional to the analog reference level.
Once converted, the relationship between the number of counts of each of the three conversions is solved for the difference in the analog value between each side of the unknown analog input.
In one embodiment, the circuitry for producing the conversion includes a three-position switch adapted to connect sequentially to a reference level and to a pair of unknown input levels, one high and one low, an integrator connected to the switch, a comparator adapted to receive the output of the integrator as well as being connected to the reference level, and calculating circuitry, including a counter, register, computer and a digital output.
In another embodiment, the same known and unknown signals are fed into a voltage-to-frequency converter having an output to a frequency counter operating a switch programmer and feeding to a register, a computer and a digital display.
|
|
Radio 
