Backward compatible wideband voice over narrowband low-resolution media

Abstract

This paper proposes a scheme for transmitting or storing a wideband version of voice (up to 7 kHz) in a narrowband channel or medium (up to 3.4 kHz) with a low resolution data format. The scheme is fully backward compatible; a conventional receiver, without any decoding mechanism, can still access a narrowband version of the wideband voice. The proposed scheme can be applied where a high quality wideband voice is needed but the physical capacity is limited. Examples are voice-over-IP, digital private branch exchange, as well as storage and playback. An audio demonstration is given in the paper.