Voltage to decibel converter having partial table lookup
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United States of America Patent
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Aug 23, 1994
Grant Date -
N/A
app pub date -
Mar 27, 1992
filing date -
Mar 27, 1992
priority date (Note) -
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Abstract
A multimeter converts an input voltage into decibels. Preferably, the input voltage is converted into dbm. The multimeter includes a table of voltage values wherein each entry is associated with a given decibel value. The input voltage is compared with entries in the table to locate a first entry which is larger than the input voltage. A second entry having a lower value than the input voltage is then located in the table. A fractional value that is indicative of where the input voltage lies at a range between the first entry and the second entry is calculated using the first and second entries. The fractional value is added to a decibel value corresponding the second entry to produce a decibel value for the input voltage. The input voltage may be scaled down into an appropriate operational voltage range and then the calculated decibel value may be scaled up to compensate for this scaling down.
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