Atmel Corp. and Bang & Olufsen subsidiary ICEpower are collaborating to provide an end-to-end audio platform for premium-quality audio playback.
The result of this collaboration is an audio reference design that provides premium-quality sound combining the Atmel AVR UC3 32-bit microcontroller with the Bang & Olufsen ICEpower's MobileSound 3, a digital, low-power single chip stereo Class D speaker amplifier, headphone amplifier and audio digital signal processor.
The reference design offers users the ability to access digital audio media; decompress music files using the Atmel UC3A3 32-bit microcontroller; and the ability to convert data into professional-quality audio through the MobileSound 3 device.
The small form factor and low-power consumption makes it suitable for mobile audio devices, such as headsets, mobile phones and accessories, tablets and laptop computers.
The MobileSound 3 output can be connected to a second high-power amplifier stage such as the ICEpower 50ASX2 to ensure premium audio quality for USB PC-speakers, media player docking stations and active Bluetooth or WiFi connected speakers.
The complete digital audio playback platform enables a user to access digital audio files from an SD card, USB mass storage device or from a host USB device such as a computer. The kit can be extended to connect to media player docking ports as well as Bluetooth or WiFi connections. The audio files can be compressed using the most proliferated compression algorithms such as AAC, MP3 or WMA.
Atmel's software framework features device and host USB protocols, with the USB audio class device support and USB mass storage file software, can be plugged directly into the user's application.
The Atmel AVR UC3 32-bit microcontroller is capable of running at 1.5 DMIPS/MHz; retrieving audio files and decompressing it; and streaming data to the MobileSound 3 amplifier for playback on loudspeakers or headphones. The amplifier outputs 2 x 1.5 Watts and has less than 0.01 percent total harmonic distortion and a signal-to-noise ratio of more than 100dB.
The 92 percent efficiency makes it possible to package the amplifier into a 3.0 x 2.6mm package including a built-in digital signal processing engine that implements SmartBass adaptive dynamic bass enhancement, SmartEQ flexible, full parametric 5-band equalizer, SmartDRC advanced parametric multistage Compressor/Limiter system as well as Digital Volume control. All these algorithms can be tuned using the software tool MobileSound3 Audio Suite from Bang & Olufsen ICEpower.