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The Dolby Digital Plus (DDPlus) multichannel audio codec employs channel coupling for parsimonious transmission of high frequency components of the signal, wherein the transform coefficients of discrete channels beyond a coupling-begin frequency are transmitted as a mono-downmix. The decoder reconstructs individual channels by appropriate panning with frequency-banded gains. While channel coupling...
Voice communication over Bluetooth wireless links has seen increasingly popular usage in recent years. In practice, wireless voice transmission subjects to frequent packet loss and bit errors in adverse conditions, which significantly degrade voice quality. This paper describes a comparative study of packet loss concealment (PLC) algorithms for Bluetooth CVSD codec. Six algorithms were evaluated,...
With the advance of short distance wireless technologies, it becomes popular to include FM transmission capability to mobile devices such as hands-free car kits, cellular phones with hands-free features, and MP3 players so that in addition to playing audio signal through the on-device loudspeaker, they can relay audio signal to other audio system to utilized their superior audio quality. Traditionally,...
A study is made on applying adaptive decorrelation filtering (ADF) to the design of an assistive listening system. The speech signal of a desired talker was corrupted by three simultaneous speech jammers and a speech-shaped diffusive noise. ADF was used to extract the desired speech from the jammers and noise. The effectiveness of the assistive listening system was measured by improvement in signal-to-noise...
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