Low-frequency phase distortion of speech recordings

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Abstract
Low-frequency phase distortion introduced by good quality audio tape recorders causes large errors in the reproduced waveform. It is advocated that a low-frequency rectangular wave should always precede the speech on recordings intended for wide distribution, so that the correct phase relationships of spectrum components can be identified. Examples of phase correction by backwards filtering with a sampled-data filter are given. In the absence of a calibration signal, one example used knowledge of typical glottal pulse shapes as a guide for phase correction. Subject Classification: XX.XX.

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