Research note Decibel analogue-to-digital converter

This paper introduces a simple circuit design for a logarithmic non-linear anaiogue-to-digital converter (NL-ADC) calibrated in decibel units. It employs two exponentially decaying generators timed such that the clocking of the output counter is reading the decibels directly. The NL-ADC operates for...

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Bibliographic Details
Published in:International journal of electronics 1988-08, Vol.65 (2), p.257-261
Main Authors: KADHIM, KADHIM N., ABDUL-KHARIM, MAJID A. H.
Format: Article
Language:English
Online Access:Get full text
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Summary:This paper introduces a simple circuit design for a logarithmic non-linear anaiogue-to-digital converter (NL-ADC) calibrated in decibel units. It employs two exponentially decaying generators timed such that the clocking of the output counter is reading the decibels directly. The NL-ADC operates for a wide range of readings ( -60-120dB) dependent on the calibration of the timing clock and the associated triggering period of the employed up-down counter. The converter finds applications in sound level, acoustic noise level, telephone instruments and subscriber lines, exchanges, repeaters, carrier systems and so on. The design employs both linear and transistor-transitor-logic (TTL) integrated circuits in the practical realization or such a NL-ADC.
ISSN:0020-7217
1362-3060
DOI:10.1080/00207218808945225