Audio peripherals such as the MICs and speakers are attached to the DSP core via a shared or point-to-point digital bus interface. If the DSP is not integrated, there is a dedicated bus interface to connect the application processor SoC to the stand-alone DSP. If it is integrated, the DSP core will be an offload processor sitting on the SoC bus hierarchy with access to the SoC's main memory system. The audio DSP core may or may not be integrated into the application processor system on chip (SoC). The subsystem is centered on an audio DSP core that handles the main audio data processing, including stream encoding/decoding to different compression standards, sample rate conversion, pre- and post-processing, noise suppression, voice trigger/speech recognition, etc. The audio/voice subsystem design must deploy advanced digital signal processing (DSP) technology and a well-architected system solution to meet the growing demands.įigure 1 shows a representative mobile audio subsystem.
On the other hand, there's the demand for always-on voice trigger and speech recognition intelligence at extremely low power. On the one hand, there's the growing demand for high-performance, high-resolution multi-channel audio stream processing. Emerging applications such as mobile gaming and voice trigger and recognition are pushing the requirements of audio/voice subsystem performance to two extreme ends of the spectrum. High-performance audio and video applications are the most essential for bringing personalization and consumer appeal to these devices.
Over the last decade, the emergence of smartphones and tablets has driven considerable technology innovation. Customizable digital signal processing (DSP) and audio/voice subsystem solution intellectual property (IP) blocks can provide a cost-effective and efficient way to develop and deliver high-performance audio/voice products. The subsystem must be designed to meet dual demands: high-performance, high-resolution audio stream processing as well as always-on, low-power voice trigger and recognition. With the growing popularity of applications such as mobile gaming and voice triggering, the audio/voice subsystem is playing a prominent role in many mobile system-on-chip (SoC) designs.
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