Communications: electrical – Land vehicle alarms or indicators – Internal alarm or indicator responsive to a condition of the...
Patent
1975-05-19
1977-04-26
Claffy, Kathleen H.
Communications: electrical
Land vehicle alarms or indicators
Internal alarm or indicator responsive to a condition of the...
179 1SC, 340347AD, 235156, G10L 100
Patent
active
040202860
ABSTRACT:
Acoustical signals of sound and noise levels are analyzed automatically for statistical characteristics of such signals which are required to be measured by recent environmental and health and safety regulations. The signals are applied to an analog to digital converter which tracks rapid changes in signal level and provides a digital output which represents the level in logarithmic (decibel) steps. The digital outputs which exist at successive sampling times provide a history of the sound level characteristics. A memory having a large sample capacity is provided to store these digital level samples. A storage capacity of several million samples is obtained by a random access memory which is addressed by the data representing the sound levels. A separate address is provided for each level (viz., for each of 100 levels differing from each other by 1 dB steps). Logic in the memory causes the digital numbers to be incremented each time a sample for the sound level corresponding to the address is presented to the memory. Totalizers and other arithmetic circuits receive data read out of the memory and provide outputs such as the percent of time that each sound level is exceeded, the amplitude distribution of the sound levels, the sound levels exceeded certain percentages of the time and other statistical amplitude distributions as are or may be required by environmental and health and safety regulations. Features of the invention include: an analog to digital converter with a variable gain amplifier whose feedback loop contains a BCD counter which generates the digital output signal; and an incremental adder which includes a counter for sequentially addressing each bit of stored digital numbers to be incremented.
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Claffy Kathleen H.
Kemeny E. S.
Lukacher Martin
Metrosonics, Inc.
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