Saturday, August 12, 2006

Digital Broadcasters|AES Seoul Papers (10)

The 29th AES Conference, "Audio for Mobile and Handheld Devices", all digital, September 2 to 4, 2006 Seoul National, lUniversity Campus

Digital Audio Presentations - Part 10

An Audio, Data and Control Interface For Digital Mobile Devices

Invited Speakers;

Juha Backman1, Nokia, Finland,

James Schuessler, Peter Kavanagh, Kenneth Boyce and Genevieve Vansteeg, National Semiconductor, USA,

Bernard van Vlimmeren, Philips Research, The Netherlands,

Xavier Lambrech, Philips Applied Technologies, Belgium,

Chris Travis, Wolfson Microelectronics, UK

This joint paper describes a new inter-chip interface standard under development, the SLIMbus, to be published by 'MIPI' - the Mobile Industry Processor Interface Alliance. The primary target of the interface is isochronous transfer of digital audio signals, supporting all common sample rates and word lengths, and related device control, but the interface is equally well applicable for any application needing moderate data rates up to 28 Mbit/s. The serial multi-drop bus with separate data and clock wires supports high- quality mobile audio by providing high-quality clock, flexible power management, and a large number of devices and audio channels.

Digital Acoustic Communication with OFDM Signal Embedded in Audio

Invited Speakers:

Hosei Matsuoka, Yusuke Nakashima and Takeshi Yoshimura, Multimedia Laboratories, NTT DoCoMo, Japan

This NTT DoCoMo paper presents a method of aerial acoustic communication in which data is modulated using OFDM (Orthogonal Frequency Division Multiplexing) and embedded in regular audio material. It can transmit at a data rate of about 1kbps, which is much higher than is possible with other data hiding techniques. In our method, the high frequency band of the digital audio signal is replaced with OFDM carriers, each of which is power-controlled according to the spectrum envelope of the audio signal. The method enables the digital transmission of short messages from loudspeakers to mobile handheld devices without significantly degrading the quality of the original voice or music signals.

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