Bandwidth Extension for Mixed Asynchronous Synchronous Speech Transmission

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Executive Summary

Increasing the bandwidth of speech signals from the classical telephone bandwidth of 300-3400 Hz to the wider bandwidth of 50-7000 Hz results in increased intelligibility and naturalness. This work presents a low complexity and low latency bandwidth extension approach for speech coding that is suitable for mixed asynchronous and synchronous transmission. At the encoder, the speech signal is sampled at a rate of 16 kHz and decomposed into two subbands of equal bandwidth. The lower subband signal is transmitted using a synchronous connection oriented link. The signal of the higher subband is analyzed resulting in signal parameters that are transmitted asynchronously. This technique can be used with communication links that provide simultaneous data and narrow band speech transmission as for example with Bluetooth.

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