Cost effectiveness filter design for low-latency audio analogue to digital converter (Σ-ΔADC)

Xiangyu, Zhu (2021) Cost effectiveness filter design for low-latency audio analogue to digital converter (Σ-ΔADC). Doctoral thesis, Birmingham City University.

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Abstract

The current technical challenge posed in professional audio industry is to have a small size portable device, which can support real-time interactive applications. Σ-Δ Modulation based audio system becomes the mainstream due to the higher resolution and fewer auxiliary circuits. However, extremely high sampling frequency brings severe challenges to its decimation or interpolation filter design and performance. The current optimal filter design parameter calculation methods have room for improvement, such as complex calculations and results need further rounding. Therefore, Author proposed a new optimal decimation or interpolation rate selection approach converts the optimization problem to factorization and permutation problem which improves the effciency significantly and provides directly usable integer solutions. Furthermore, due to the lack of theoretical relationship between latency of filter and multi-stage design parameters a latency estimation equation is derived by author. The analysis of this equation shows that optimal computational cost design and optimal latency design have contradictory requirements. Hence, the optimization of filter design parameter is added to optimize the other costs as much as possible. Thus, author proposed a new numeric optimization based method to design the cost effcient low-latency multi-stage multi-rate Filter. This approach further reduces the costs of the filter on the basis of the previous optimal design. At last, a MATLAB GUI based filter design and evaluation framework has been established which can help user to search the optimal design parameters and design optimal filters with different filter types.

Item Type: Thesis (Doctoral)
Dates:
DateEvent
6 December 2020Submitted
9 July 2021Accepted
Uncontrolled Keywords: Digital Filter, Sigma-Delta Modulation, Interpolation/Decimation Rate, Annealing Algorithm, MATLAB GUI, Filter Design/Evaluation Framework
Subjects: CAH11 - computing > CAH11-01 - computing > CAH11-01-02 - information technology
CAH11 - computing > CAH11-01 - computing > CAH11-01-03 - information systems
CAH11 - computing > CAH11-01 - computing > CAH11-01-08 - others in computing
Divisions: Doctoral Research College > Doctoral Theses Collection
Faculty of Computing, Engineering and the Built Environment > School of Computing and Digital Technology
Depositing User: Richard Birley
Date Deposited: 16 Jun 2022 14:06
Last Modified: 16 Jun 2022 14:06
URI: http://www.open-access.bcu.ac.uk/id/eprint/13297

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