| 摘要 |
PURPOSE:To decrease a circuit scale by obtaining the mean value of stored bit number within the prescribed time, converting the obtained mean value into an analog signal, giving it to a voltage controlled oscillator and using the output of the voltage controlled oscillator as a desired clock. CONSTITUTION:The mean value of stored bit number within the prescribed time is obtained by a mean value arithmetic means 3, a D/A converter 4 converts it into an analog signal, fed to a voltage controlled oscillator 5 and the frequency of the voltage controlled oscillator is controlled. Then the data stored in a data storage section 2 is read by using the output clock of the controlled voltage controlled oscillator 5. Thus, in order to obtain a frequency synchronizing with the frequency of the bit string at a transmission side, the mean value arithmetic means 3 obtaining the mean value of the stored bit number within the prescribed time in the data storage section 2, the D/A converter 4 and the voltage controlled oscillator 5 are enough for the purpose, thus, the circuit scale is decreased. |
