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Basics of embedded video, Part 3

Posted: 05 Dec 2008     Print Version  Bookmark and Share

Keywords:audio codec  DMA engine  buffer 

There are a number of ways to get audio data into the processor core. For example, a foreground programme poll a serial port for new data, but this type of transfer is uncommon in embedded media processors because it makes inefficient use of the core. Instead, a processor connected to an audio codec usually uses a DMA engine to transfer the data from the codec link (like a serial port) to some memory space available to the processor. This transfer of data occurs in the background without the core's intervention. The only overhead is in setting up the DMA sequence and handling the interrupts once the buffer of data has been received or transmitted.

Part 3 of the "Basics of embedded video" series reviews data-management schemes such as double-buffering and DMA transfers, and then discusses the basics of audio algorithms.

View the PDF document for more information.

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