CASE: CNN Acceleration for Speech-Classification in Edge-Computing

Haris Gulzar, Muhammad Shakeel, Kenji Nishida, Katsutoshi Itoyama, Kazuhiro Nakadai, Hideharu Amano

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)


High performance of Machine Learning algorithms has enabled numerous applications based upon speech interface in our daily life, but most of the frameworks use computationally expensive algorithms deployed on cloud servers as speech recognition engines. With the recent surge in the number of IoT devices, a robust and scalable solution for enabling AI applications on IoT devices is inevitable in form of edge computing. In this paper, we propose the application of Systemon-Chip (SoC) powered edge computing device as accelerator for speech commands classification using Convolutional Neural Network (CNN). Different aspects affecting the CNN performance are explored and an efficient and light-weight model named as CASENet is proposed which achieves state-of-the-art performance with significantly smaller number of parameters and operations. Efficient extraction of useful features from audio signal helped to maintain high accuracy with a 6X smaller number of parameters, making CASENet the smallest CNN in comparison to similarly performing networks. Light-weight nature of the model has led to achieve 96.45% validation accuracy with a 14X smaller number of operations which makes it ideal for low-power IoT and edge devices. A CNN accelerator is designed and deployed on FPGA part of SoC equipped edge server device. The hardware accelerator helped to improve the inference latency of speech command by a 6.7X factor as compared to standard implementation. Memory, computational cost and latency are the most important metrics for selecting a model to deploy on edge computing devices, and CASENet along with the accelerator surpasses all of these requirements.

Original languageEnglish
Title of host publicationProceedings - 2021 IEEE Cloud Summit, Cloud Summit 2021
PublisherInstitute of Electrical and Electronics Engineers Inc.
Number of pages6
ISBN (Electronic)9781665425827
Publication statusPublished - 2021
Event2021 IEEE Cloud Summit, Cloud Summit 2021 - Virtual, Online, United States
Duration: 2021 Oct 212021 Oct 22

Publication series

NameProceedings - 2021 IEEE Cloud Summit, Cloud Summit 2021


Conference2021 IEEE Cloud Summit, Cloud Summit 2021
Country/TerritoryUnited States
CityVirtual, Online


  • Accelerator
  • Edge Computing
  • Internet of Things
  • Machine Learning
  • Speech Classification

ASJC Scopus subject areas

  • Computer Networks and Communications
  • Computer Science Applications
  • Control and Optimization
  • Information Systems and Management


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