Voice signal compacting and expanding device with frequency divi

Details Voice signal compacting and expanding device with frequency divi Voice signal compacting and expanding device with frequency divi

1994-12-22

1998-11-24

MacDonald, Allen R.

395 22, 395 214, G10L 302

Patent

active

058419454

ABSTRACT:
In the present invention, the voice signals are A/D converted at a predetermined period of t and are divided into two frequency sides, in that a high frequency side and a low frequency side, and the high frequency side voice signals are then converted into data having a lower sampling frequency than that of the A/D conversion after performing a voice tone level conversion toward a lower frequency side and without performing thinned out sampling of the high frequency side voice signals. On the other hand, the sampling data of the low frequency side are thinned out, therefore equivalently the sampling frequency is reduced. Thereby, the amount of data to be stored is reduced and the reduced data are stored in a memory. During reproduction the data of the high frequency side are restored through a voice tone level conversion toward the high frequency side, and the data of the low frequency side are reproduced after restoring the sampling frequency to the original frequency at the time of A/D conversion such as by sampling a plurality of same data or by producing interpolation data.

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patent: 4627090 (1986-12-01), Smith, III et al.
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