ON Semiconductor, headquartered in Phoenix, Arizona, is a supplier of high-performance, energy efficient silicon-based products for green (low power consumption) electronics. ON Semiconductor specializes in a variety of fields, including power and signal management, logic and discrete devices for automotive, aerospace, lighting, medical and power applications. The Applied Digital Signal Processing Group (ADSPG) under ON Semiconductor’s Medical Division, in Waterloo, Ontario, researches and designs digital signal processing algorithms for hearing health products, including hearing aids. ADSPG is developing a new test framework under a long-term project with the intention of supporting customers specializing in designing hearing aids. The testing system configuration is illustrated in Figure 1. The team investigated the development of an optimal Signal-to Noise Ratio (SNR) measurement method for mixed signals (sample by sample addition of two or more discrete signals) in their testing framework .
ON Semiconductor tasked Bill Zhao, a 3rd year electrical engineering co-op student from the University of Waterloo, to evaluate and compare various mixed signal SNR measurement methods used in the development of noise reduction algorithms.
Figure 1 - Test setup and signal flow for acoustic test
This case study is intended as an exercise in the engineering design process and the application of engineering concepts in a practical environment. This case study tests students on their knowledge and understanding of signals and DSP concepts.
- Using the engineering design process
- Understanding DSP concepts
- Applying engineering principles to SNR measurement methods
- Utilize understanding of course concepts to derive set of criteria
- Use provided data and decision matrix to perform evaluations and make recommendations