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Techniques for artificial bandwidth extension of telephone speech

机译：电话语音的人工带宽扩展技术

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摘要

Most of the current telephone systems are still restricted to the historically motivated limitation of the bandwidth from 0.3 to 3.4 kHz. This bandwidth ensures a sufficient intelligibility of speech-the speech quality, however, suffers from the reduced bandwidth. One possible approach to reduce the quality loss is the application of an artificial bandwidth extension system at the receiver which is proposed in this contribution. Based on a priori knowledge concerning the characteristics of speech signals and without transmitting any extra information the bandwidth is extended to the range from the lower hearing limit to 8 kHz. Because of the uniqueness of speech an exact reconstruction of the spectrally unrestricted original signal is not possible. In fact, only the subjective impression of an enlarged bandwidth is possible and intended.
机译：当前大多数电话系统仍受历史动机限制，带宽从0.3到3.4 kHz。该带宽确保了语音的足够清晰度，但是语音质量受到带宽减小的困扰。减少质量损失的一种可能的方法是在接收机中应用人工带宽扩展系统，这是为此做出的建议。基于有关语音信号特性的先验知识，无需传输任何额外信息，带宽就可以扩展到从听觉下限到8 kHz的范围。由于语音的唯一性，不可能对频谱不受限制的原始信号进行精确的重建。实际上，只有主观的印象才有可能扩大带宽。

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