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In automotive infotainment systems, multiple types of digital audio signals are usually present. Some come from internal sources, such as a CD or USB stick, and some come from external sources, such as an internet stream or digital radio. These sources usually have different sample-rates, and may also be different from one or more system sample-rates. Managing and transporting these signals throughout the system over different sample-rate domains require detailed upfront architecture analysis and correct system design to ensure signal quality is maintained to the desired level. Incorrect design can add significant user-perceivable noise and distortion. This paper examines the key analysis factors, the effects of poor design and the approaches for achieving robust signal handling and ensuring desired signal quality.

Digital Signal Processing (DSP) is applicable to many types of wireless products and systems, and automotive AM/FM receivers are no exception. Processing intermediate-frequency (IF) radio signals in DSP is the logical extension of baseband and audio DSP already commonplace, and is enabled by current analog-to-digital (A/D) technology and digital logic densities. This paper describes the functionality and development of a DSP integrated circuit providing complete IF, baseband, and audio processing for automotive receivers.