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On the design of an energy efficient digital IIR A-weighting filter using approximate multiplication
ID Pilipović, Ratko (Author), ID Risojević, Vladimir (Author), ID Bulić, Patricio (Author)

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Abstract
This paper presents a new A-weighting filter’s design and explores the potential of using approximate multiplication for low-power digital A-weighting filter implementation. It presents a thorough analysis of the effects of approximate multiplication, coefficient quantization, the order of first-order sections in the filter’s cascade, and zero-pole pairings on the frequency response of the digital A-weighting filter. The proposed A-weighting filter was implemented as a sixth-order IIR filter using approximate odd radix-4 multipliers. The proposed filter was synthesized (Verilog to GDS) using the Nangate45 cell library, and MATLAB simulations were performed to verify the designed filter’s magnitude response and performance. Synthesis results indicate that the proposed design achieves nearly 70% reduction in energy (power-delay product) with a negligible deviation of the frequency response from the floating-point implementation. Experiments on acoustic noise suggest that the proposed digital A-weighting filter can be deployed in environmental noise measurement applications without any notable performance degradation.

Language:English
Keywords:band-pass digital filters, A-weighting filter, approximate computing, approximate filter, noise sensing
Work type:Article
Typology:1.01 - Original Scientific Article
Organization:FRI - Faculty of Computer and Information Science
Publication status:Published
Publication version:Version of Record
Year:2021
Number of pages:22 str.
Numbering:Vol. 21, iss. 3, art. 732
PID:20.500.12556/RUL-134881 This link opens in a new window
UDC:004
ISSN on article:1424-8220
DOI:10.3390/s21030732 This link opens in a new window
COBISS.SI-ID:48247043 This link opens in a new window
Publication date in RUL:10.02.2022
Views:716
Downloads:121
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Record is a part of a journal

Title:Sensors
Shortened title:Sensors
Publisher:MDPI
ISSN:1424-8220
COBISS.SI-ID:10176278 This link opens in a new window

Licences

License:CC BY 4.0, Creative Commons Attribution 4.0 International
Link:http://creativecommons.org/licenses/by/4.0/
Description:This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.
Licensing start date:01.02.2021

Secondary language

Language:Slovenian
Keywords:pasovno prepustni digitalni filtri, A-utežnostni filter, aproksimativno računanje, aproksimativni filter

Projects

Funder:ARRS - Slovenian Research Agency
Project number:P2-0359
Name:Vseprisotno računalništvo

Funder:ARRS - Slovenian Research Agency
Project number:P2-0257
Name:Sistemi na čipu z integriranimi mikromehanskimi, s THz, z magnetnimi in z elektrokemijskimi senzorji

Funder:ARRS - Slovenian Research Agency
Project number:BI-BA/19-20-047

Funder:Other - Other funder or multiple funders
Funding programme:Bosnia and Herzegovina, Ministry of Civil Affairs

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