A Hi-Fi add-on board, designed to bring HD audio to Raspberry Pi, has been developed by Wolfson Microelectronics in collaboration with element14.
The audio card brings both line in, line out headphone and headset support, on-board stereo microphones and digital audio S/PDIF functionality to the micro-sized computer for the first time. According to Wolfson, the module is capable of 113dB SNR headphone playback (29mW into 32O load at 0.1% THD+N) and has a built-in Class-D amplifier for driving small local speakers. For recording, the audio card also has 96dB SNR microphone inputs, and the PCB includes built-in MEMS microphones. For more basic audio, there is a microphone/headset plug that allows users to make the most out of VoIP telephony. David Shen, CTO of element14, said: "The Wolfson Audio Card brings an incredibly exciting audio development capability to the millions of people who already use the Raspberry Pi. "With its comprehensive feature set, ease of use and extreme audio quality, designers will have a completely new audio toolset from which to work from.