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Audio Tutorial - University of Washington
https://class.ece.uw.edu/271/hauck2/de1/audio/Audio_Tutorial.pdf
The DE1_SoC has three audio jacks: a line out, a line in, and a microphone jack. In this tutorial, only the line out and microphone in are used. The jacks interface with a Wolfson WM8731 audio CODEC (coder / decoder) chip. This chip has ADCs (analog to digital converters)
CODEC Tutorial - SourceForge
http://codec.sourceforge.net/CodecTutorial.pdf
version of CODEC was ready at the end of 1999 as a well modularized and structured package. The CDC department of the Technical University of Darm-stadt contributed to CODEC by implementing CODEC packages for X.509 and PKCS#12 and there is an ongoing collaboration for maintenance, enhancement and extension of CODEC .
SigmaDSP Stereo, Low Power, 96 kHz, 24-Bit Audio …
https://www.analog.com/media/en/technical-documentation/data-sheets/ADAU1761.pdf
The ADAU1761 is a low power, stereo audio codec with integrated digital audio processing that supports stereo 48 kHz record and playback at 14 mW from a 1.8 V analog supply. The stereo audio ADCs and DACs support sample rates from 8 kHz to …
Open IC - Audio Tutorial
https://sceweb.sce.uhcl.edu/xiaokun/doc/OpenIC/AudioZyncTutorial.pdf
First, we must activate an I2C connection on the processor in order to write to the audio codec’s registers. Secondly, we need to create a new clock to drive the audio codec. To create the I2C connection, we will navigate to the “Peripheral I/O Pins” page on the left‐hand Page Navigator.
MP3 and AAC Explained - Fraunhofer
https://www.iis.fraunhofer.de/content/dam/iis/de/doc/ame/conference/AES-17-Conference_mp3-and-AAC-explained_AES17.pdf
1. HIGH QUALITY AUDIO CODING The basic task of a perceptual audio coding system is to compress the digital audio data in a way that the compression is as efficient as possible, i.e. the compressed file is as small as possible and the reconstructed (decoded) audio sounds exactly (or as close as possible) to the original audio before compression.
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