SPEAKING SPEED CONVERSION DEVICE, SPEAKING SPEED CONVERSION METHOD, PROGRAM, AND STORAGE MEDIUM

摘要

This speaking speed conversion device for converting speaking speed in a voice communication device decrypts voice encoded data, outputs a voice signal, generates frequency information from information obtained in the course of decryption, obtains the amount of variation over time of the frequency information as information change volume, determines, on the basis of the voice signal, whether a reception voice represented by the voice encoded data has a sound or no sound, determines that a syllable has transitioned if the information change volume during the time of determining that the reception voice has a sound satisfies a predetermined condition, calculates the speaking speed on the basis of the result of determination about the transition of the syllable, determines the conversion rate on the basis of the speaking speed, and converts the speaking speed with the determined conversion rate. The invention makes it possible to reduce the amount of calculation and carry out appropriate speaking speed conversion in accordance with the speaking speed.