Home > Uncategorized > Reducing power consumption of Bluetooth: the Apple solution

Reducing power consumption of Bluetooth: the Apple solution

Portable devices, such as an iPhone or iPod touch, can convert media files stored in a compressed format to a Bluetooth-compatible format to allow wireless transmission of media to an external device, like a Bluetooth headset. This process could be power-hungry one.

Compression of data is necessary with Bluetooth because the technology has a limited transmission throughput. Traditional Bluetooth converters fully decode and re-encode compressed data, which can be taxing on a device.

Apple’s solution aims to “significantly lower” the number and complexity of computations executed in transmitting media over Bluetooth. Its proposed invention includes a dedicated format converter that could take a media file and produce data in a Bluetooth-compatible format in a more energy-efficient manner.

This format converter could include a band separation module, a bit allocation unit, conversion modules, and quantizers, that would decompose the frequency domain information of a file, such as AAC audio, and turn it into a plurality of data streams comprised of different sub-bands.

The format converter would then transform each data stream to a new encoding scheme, and then quantize the streams based on bit allocation for each sub-band. The included bit allocation unit would compute information for each sub-band based on an unfiltered version of the compressed data.

“Then… the format converter can assemble the transformed data streams into frames of appropriate sizes for Bluetooth transmission, and may perform other functions necessary to prepare the transformed data streams for transmission over a Bluetooth link.”

Apple also joined the Bluetooth Special Interest Group Board of Directors in June 2011, when it was revealed that Apple is aiding in developing the low-power Bluetooth 4.0 specification. Most of Apple’s latest products, including the new iPad and iPhone 4S, also offer support for Bluetooth 4.0.

(from: http://www.appleinsider.com)

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