| 摘要 |
PURPOSE:To conduct a high quality sound recording of digital voice signals for a long time. CONSTITUTION:Input voice signals are converted into gidital data in an A/D converter 12, coded by a coder 14 and stored in a voice memory 30. Then, the inputted signals are fed to a characteristic discrimination section 24 and the distinction of the sex of the speaker is made by checking the frequency characteristics of the data, for example, by discriminating the level of the voice signal of lower frequency. The discrimination result is supplied to a control section 26, which sets the sampling frequency of the converter 12 lower than that of a female when the speaker is discriminated to be a male. Since a male voice contains much lower frequency components, a lower sampling frequency does not adversely affect the tone quality. By conducting the above control, an efficient data compression is accomplished and a long time recording is performed while keeping the tone quality high. |
