| 摘要 |
PURPOSE:To easily obtain a regenerating signal having a good quality, which is brought to tangent approximation, by integrating a ratio of an amplitude value in digital data and a value showing a sampling period, and executing interpolation of a signal. CONSTITUTION:For instance, a voice is converted to an electric signal by a microphone, and thereafter, is sampled by a sampling period of an A/D converter ADC, and its amplitude value is quantized. It is controlled by a controlling circuit CCT, and is stored in the second memory M2 as data consisting of a group of the amplitude value and information related to a zero point interval. In case of regeneration, this data group is read out and is provided to a D/A converter DAC, the digital amplitude value and the information related to the zero point interval are converted to an analog value, and a signal is applied to an interpolating circuit CP. The interpolating circuit CP consists of a divider and an integrator, and by the divider, a ratio of the amplitude value of the analog value and the information related to the zero point interval is calculated, and its output is integrated by the integrator, and is made approximate to its original AC signal by tangent approximation. |
