MAGNETIC RECORDING AND REPRODUCING DEVICE

摘要

PURPOSE:To reduce the scale of a circuit and improve reliability and performance by processing AFT control in which a regenerative pilot signal is A/D- converted and processed as a digital signal in accordance with a program and the control of the speed and phase of a drum and the speed of a tape with the same processor. CONSTITUTION:Respective detected signals produced by DFG sensor 5, DPG sensor 6 and CFG sensor 9 are detected and calcurated by FD detector circuits 14 and 16 and PD detector circuits 15 and 17 and DSP 26, then a drum and capstan motors 4 and 8 are rotated by MDAs 31 and 32 in desired speed and phase. Also, the regenerative pilot signal sampled from a magnetic tape 1 by an analog LPF 18 is converted into a digital signal with sampling frequency of the common multiple of four frequency by an A/D converter 20. After processing the data by data thinning-out circuits 22 and 23, the data is processed by the DSP 26 controlling the motors 4 and 8 in accordance with a prescribed program and AFT tracking control is executed. Consequently, the scale of the circuit is reduced and the reliability and the performance are improved.