On the design of an energy efficient digital IIR A-weighting filter using approximate multiplication

Pilipović, Ratko (author), Risojević, Vladimir (author), Bulić, Patricio (author)

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
• UDC: 004
• ISSN on article: 1424-8220
• DOI: 10.3390/s21030732
• COBISS.SI-ID: 48247043
• Publication date in RUL: 10.02.2022

Record is a part of a journal

• Title: Sensors
• Shortened title: Sensors
• Publisher: MDPI
• ISSN: 1424-8220
• COBISS.SI-ID: 10176278

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