Patent ID: 6373421
Filing Date: 2002-04-16
Classification: G10L,G11B

Abstract:
A voice recording/reproducing device implemented by using an adaptive differential pulse code modulation method comprising:an analog-digital converter to sample analog voice signals and to convert them to digital voice data; recording means for quantizing a difference in the sampled data value between a digital voice data and a subsequent and neighboring digital voice data obtained by said analog-digital converter in accordance with a width for quantizing corresponding to the difference, for obtaining encoded data by encoding the quantized difference and then for splitting the encoded voice data into voice blocks each having a predetermined size; reproducing means for reproducing digital voice data, at a time of a fast-forward reproduction, by sequentially decoding specified data composed of the encoded data contained in the voice block to be reproduced and obtained by removing and culling a part of voice blocks from a series of the split voice blocks; and a digital-analog converter to convert reproduced digital voice data to analog voice signals, whereby said recording means is operated to add just previously sampled data and a parameter used to decide said width for quantizing to a head of said encoded data of each voice block and said reproducing means is operated, at the time of the fast-forward reproduction, to decode said head of said encoded data of the voice block to be reproduced based on said additional data.